summaryrefslogtreecommitdiff
path: root/src/lib/eet/Eet.h
blob: 71b87cee5512f501c693055f2def323c9c3345d9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
/**
   @brief Eet Data Handling Library Public API Calls

   These routines are used for Eet Library interaction

   @page eet_main Eet

   @date 2000 (created)

   @section toc Table of Contents

   @li @ref eet_main_intro
   @li @ref eet_main_compiling
   @li @ref eet_main_next_steps
   @li @ref eet_main_intro_example

   @section eet_main_intro Introduction

   It is a tiny library designed to write an arbitrary set of chunks of data
   to a file and optionally compress each chunk (very much like a zip file)
   and allow fast random-access reading of the file later on. It does not
   do zip as a zip itself has more complexity than is needed, and it was much
   simpler to implement this once here.

   Eet is extremely fast, small and simple. Eet files can be very small and
   highly compressed, making them very optimal for just sending across the
   internet without having to archive, compress or decompress and install them.
   They allow for lightning-fast random-access reads once created, making them
   perfect for storing data that is written once (or rarely) and read many
   times, but the program does not want to have to read it all in at once.

   It also can encode and decode data structures in memory, as well as image
   data for saving to Eet files or sending across the network to other
   machines, or just writing to arbitrary files on the system. All data is
   encoded in a platform independent way and can be written and read by any
   architecture.

   @section eet_main_compiling How to compile

   Eet is a library your application links to. The procedure for this is very
   simple. You simply have to compile your application with the appropriate
   compiler flags that the @p pkg-config script outputs. For example:

   Compiling C or C++ files into object files:

   @verbatim
   gcc -c -o main.o main.c `pkg-config --cflags eet`
   @endverbatim

   Linking object files into a binary executable:

   @verbatim
   gcc -o my_application main.o `pkg-config --libs eet`
   @endverbatim

   See @ref pkgconfig

   @section eet_main_next_steps Next Steps

   After you understood what Eet is and installed it in your system
   you should proceed understanding the programming interface. We'd
   recommend you to take a while to learn @ref Eina as it is very
   convenient and optimized, and Eet provides integration with it.

   Recommended reading:

   @li @ref Eet_File_Group to know the basics to open and save files.
   @li @ref Eet_Data_Group to know the convenient way to serialize and
    parse your data structures automatically. Just create your
    descriptors and let Eet do the work for you.

   @section eet_main_intro_example Introductory Examples

   Here is a simple example on how to use Eet to save a series of strings to a
   file and load them again. The advantage of using Eet over just
   fprintf() and
   fscanf() is that not only can these entries be strings, they need no special
   parsing to handle delimiter characters or escaping, they can be binary data,
   image data, data structures containing integers, strings, other data
   structures, linked lists and much more, without the programmer having to
   worry about parsing, and best of all, Eet is very fast.

   This is just a very simple example that doesn't show all of the capabilities
   of Eet, but it serves to illustrate its simplicity.

   @include eet-basic.c

   More examples can be found at @ref eet_examples.

   @todo Document data format for images and data structures.

 */

#ifndef _EET_H
#define _EET_H

#include <stdlib.h>
#include <stdio.h>
#include <Efl_Config.h>
#include <Eina.h>
#include <Emile.h>

#ifdef EAPI
# undef EAPI
#endif /* ifdef EAPI */

#ifdef _WIN32
# ifdef EFL_EET_BUILD
#  ifdef DLL_EXPORT
#   define EAPI __declspec(dllexport)
#  else /* ifdef DLL_EXPORT */
#   define EAPI
#  endif /* ! DLL_EXPORT */
# else /* ifdef EFL_EET_BUILD */
#  define EAPI __declspec(dllimport)
# endif /* ! EFL_EET_BUILD */
#else /* ifdef _WIN32 */
# ifdef __GNUC__
#  if __GNUC__ >= 4
#   define EAPI __attribute__ ((visibility("default")))
#  else /* if __GNUC__ >= 4 */
#   define EAPI
#  endif /* if __GNUC__ >= 4 */
# else /* ifdef __GNUC__ */
#  define EAPI
# endif /* ifdef __GNUC__ */
#endif /* ! _WIN32 */

#ifdef __cplusplus
extern "C" {
#endif /* ifdef __cplusplus */

/**
 * @file Eet.h
 * @brief The file that provides the eet functions.
 *
 * This header provides the Eet management functions.
 *
 */

/**
 * @def EET_VERSION_MAJOR
 * The major number of eet version
 */
#define EET_VERSION_MAJOR EFL_VERSION_MAJOR
/**
 * @def EET_VERSION_MINOR
 * The minor number of eet version
 */
#define EET_VERSION_MINOR EFL_VERSION_MINOR
/**
 * @typedef Eet_Version
 *
 * This is the Eet version information structure that can be used at
 * runtime to detect which version of eet is being used and adapt
 * appropriately as follows for example:
 *
 * @code
 * #if defined(EET_VERSION_MAJOR) && (EET_VERSION_MAJOR >= 1) && defined(EET_VERSION_MINOR) && (EET_VERSION_MINOR > 2)
 * printf("Eet version: %i.%i.%i\n",
 *        eet_version->major,
 *        eet_version->minor,
 *        eet_version->micro);
 * if (eet_version->revision > 0)
 *   {
 *     printf("  Built from SVN revision # %i\n", eet_version->revision);
 *   }
 * #endif
 * @endcode
 *
 * Note the \#if check can be dropped if your program refuses to compile or
 * work with an Eet version less than 1.3.0.
 */
typedef struct _Eet_Version
{
   int major; /** < major (binary or source incompatible changes) */
   int minor; /** < minor (new features, bugfixes, major improvements version) */
   int micro; /** < micro (bugfix, internal improvements, no new features version) */
   int revision; /** < svn revision (0 if a proper release or the svn revision number Eet is built from) */
} Eet_Version;

EAPI extern Eet_Version *eet_version;

/**
 * @defgroup Eet_Group Top level functions
 * @ingroup Eet
 * Functions that affect Eet as a whole.
 *
 * @{
 */

/**
 * @enum _Eet_Error
 * All the error identifiers known by Eet.
 */
typedef enum _Eet_Error
{
   EET_ERROR_NONE, /**< No error, it's all fine! */
   EET_ERROR_BAD_OBJECT, /**< Given object or handle is NULL or invalid */
   EET_ERROR_EMPTY, /**< There was nothing to do */
   EET_ERROR_NOT_WRITABLE, /**< Could not write to file or file is #EET_FILE_MODE_READ */
   EET_ERROR_OUT_OF_MEMORY, /**< Could not allocate memory */
   EET_ERROR_WRITE_ERROR, /**< Failed to write data to destination */
   EET_ERROR_WRITE_ERROR_FILE_TOO_BIG, /**< Failed to write file since it is too big */
   EET_ERROR_WRITE_ERROR_IO_ERROR, /**< Failed to write due a generic Input/Output error */
   EET_ERROR_WRITE_ERROR_OUT_OF_SPACE, /**< Failed to write due out of space */
   EET_ERROR_WRITE_ERROR_FILE_CLOSED, /**< Failed to write because file was closed */
   EET_ERROR_MMAP_FAILED, /**< Could not mmap file */
   EET_ERROR_X509_ENCODING_FAILED, /**< Could not encode using X509 */
   EET_ERROR_SIGNATURE_FAILED, /**< Could not validate signature */
   EET_ERROR_INVALID_SIGNATURE, /**< Signature is invalid */
   EET_ERROR_NOT_SIGNED, /**< File or contents are not signed */
   EET_ERROR_NOT_IMPLEMENTED, /**< Function is not implemented */
   EET_ERROR_PRNG_NOT_SEEDED, /**< Could not introduce random seed */
   EET_ERROR_ENCRYPT_FAILED, /**< Could not encrypt contents */
   EET_ERROR_DECRYPT_FAILED /**< Could not decrypt contents */
} Eet_Error; /**< Eet error identifiers */

/**
 * @}
 */

/**
 * @defgroup Eet_Compression Eet Compression Levels
 * @ingroup Eet
 * Compression modes/levels supported by Eet.
 *
 * @{
 */

/**
 * @enum _Eet_Compression
 * All the compression modes known by Eet.
 */

typedef enum _Eet_Compression
{
   EET_COMPRESSION_NONE      = 0,  /**< No compression at all @since 1.7 */
   EET_COMPRESSION_DEFAULT   = 1,  /**< Default compression (Zlib) @since 1.7 */
   EET_COMPRESSION_LOW       = 2,  /**< Fast but minimal compression (Zlib) @since 1.7 */
   EET_COMPRESSION_MED       = 6,  /**< Medium compression level (Zlib) @since 1.7 */
   EET_COMPRESSION_HI        = 9,  /**< Slow but high compression level (Zlib) @since 1.7 */
   EET_COMPRESSION_VERYFAST  = 10, /**< Very fast, but lower compression ratio (LZ4HC) @since 1.7 */
   EET_COMPRESSION_SUPERFAST = 11, /**< Very fast, but lower compression ratio (faster to compress than EET_COMPRESSION_VERYFAST)  (LZ4) @since 1.7 */

   EET_COMPRESSION_LOW2      = 3,  /**< Space filler for compatibility. Don't use it @since 1.7 */
   EET_COMPRESSION_MED1      = 4,  /**< Space filler for compatibility. Don't use it @since 1.7 */
   EET_COMPRESSION_MED2      = 5,  /**< Space filler for compatibility. Don't use it @since 1.7 */
   EET_COMPRESSION_HI1       = 7,  /**< Space filler for compatibility. Don't use it @since 1.7 */
   EET_COMPRESSION_HI2       = 8   /**< Space filler for compatibility. Don't use it @since 1.7 */
} Eet_Compression; /**< Eet compression modes @since 1.7 */

/**
 * @}
 */

/**
 * Initialize the EET library.
 *
 * The first time this function is called, it will perform all the internal
 * initialization required for the library to function properly and increment
 * the initialization counter. Any subsequent call only increment this counter
 * and return its new value, so it's safe to call this function more than once.
 *
 * @return The new init count. Will be 0 if initialization failed.
 *
 * @since 1.0.0
 * @ingroup Eet_Group
 */
EAPI int
eet_init(void);

/**
 * Shut down the EET library.
 *
 * If eet_init() was called more than once for the running application,
 * eet_shutdown() will decrement the initialization counter and return its
 * new value, without doing anything else. When the counter reaches 0, all
 * of the internal elements will be shutdown and any memory used freed.
 *
 * @return The new init count.
 *
 * @since 1.0.0
 * @ingroup Eet_Group
 */
EAPI int
eet_shutdown(void);

/**
 * Clear eet cache
 *
 * For a faster access to previously accessed data, Eet keeps an internal
 * cache of files. These files will be freed automatically only when
 * they are unused and the cache gets full, in order based on the last time
 * they were used.
 * On systems with little memory this may present an unnecessary constraint,
 * so eet_clearcache() is available for users to reclaim the memory used by
 * files that are no longer needed. Those that were open using
 * ::EET_FILE_MODE_WRITE or ::EET_FILE_MODE_READ_WRITE and have modifications,
 * will be written down to disk before flushing them from memory.
 *
 * @since 1.0.0
 * @ingroup Eet_Group
 */
EAPI void
eet_clearcache(void);

/**
 * @defgroup Eet_File_Group Eet File Main Functions
 * @ingroup Eet
 *
 * Functions to create, destroy and do basic manipulation of
 * #Eet_File handles.
 *
 * This sections explains how to use the most basic Eet functions, which
 * are used to work with eet files, read data from them, store it back in or
 * take a look at what entries it contains, without making use of the
 * serialization capabilities explained in @ref Eet_Data_Group.
 *
 * The following example will serve as an introduction to most, if not all,
 * of these functions.
 *
 * If you are only using Eet, this is the only header you need to include.
 * @dontinclude eet-file.c
 * @skipline Eet.h
 *
 * Now let's create ourselves an eet file to play with. The following function
 * shows step by step how to open a file and write some data in it.
 * First, we define our file handler and some other things we'll put in it.
 * @line static int
 * @skip Eet_File
 * @until ";
 * @skip eet_open
 *
 * We open a new file in write mode, and if it fails, we just return, since
 * there's not much more we can do about it..
 * @until return
 *
 * Now, we need to write some data in our file. For now, strings will suffice,
 * so let's just dump a bunch of them in there.
 * @until }
 *
 * As you can see, we copied a string into our static buffer, which is a bit
 * bigger than the full length of the string, and then told Eet to write it
 * into the file, compressed, returning the size of the data written into the
 * file.
 * This is all to show that Eet treats data as just data. It doesn't matter
 * what that data represents (for now), it's all just bytes for it. As running
 * the following code will show, we took a string of around 30 bytes and put it
 * in a buffer of 1024 bytes, but the returned size won't be any of those.
 * @until printf
 *
 * Next, we copy into our buffer our set of strings, including their null
 * terminators and write them into the file. No error checking for the sake
 * of brevity. And a call to eet_sync() to make sure all out data is
 * properly written down to disk, even though we haven't yet closed the file.
 * @until eet_sync
 *
 * One more write, this time our large array of binary data and... well, I
 * couldn't come up with a valid use of the last set of strings we stored,
 * so let's take it out from the file with eet_delete().
 * @until eet_delete
 *
 * Finally, we close the file, saving any changes back to disk and return.
 * Notice how, if there's any error closing the file or saving its contents,
 * the return value from the function will be a false one, which later on
 * will make the program exit with an error code.
 * @until return
 *
 * Moving onto our main function, we will open the same file and read it back.
 * Trivial, but it'll show how we can do so in more than one way. We'll skip
 * the variable declarations, as they aren't very different from what we've
 * seen already.
 *
 * We start from the beginning by initializing Eet so things in general work.
 * Forgetting to do so will result in weird results or crashes when calling
 * any eet function, so if you experience something like that, the first thing
 * to look at is whether eet_init() is missing.
 * Then we call our @p create_eet_file function, described above, to make
 * sure we have something to work with. If the function fails it will return
 * 0 and we just exit, since nothing from here onwards will work anyway.
 * @skip eet_init
 * @until return
 *
 * Let's take a look now at what entries our file has. For this, we use
 * eet_list(), which will return a list of strings, each being the name of
 * one entry. Since we skipped before, it may be worth noting that @p list
 * is declared as a @p char **.
 * The @p num parameter will, of course, have the number of entries contained
 * in our file.
 * If everything's fine, we'll get our list and print it to the screen, and
 * once done with it, we free the list. That's just the list, not its contents,
 * as they are internal strings used by Eet and trying to free them will surely
 * break things.
 * @until }
 *
 * Reading back plain data is simple. Just a call to eet_read() with the file
 * to read from, and the name of the entry we are interested in. We get back
 * our data and the passed @p size parameter will contain the size of it. If
 * the data was stored compressed, it will decompressed first.
 * @until }
 *
 * Another simple read for the set of strings from before, except those were
 * deleted, so we should get a NULL return and continue normally.
 * @until }
 *
 * Finally, we'll get our binary data in the same way we got the strings. Once
 * again, it makes no difference for Eet what the data is, it's up to us to
 * know how to handle it.
 * @until {
 *
 * Now some cheating, we know that this data is an Eet file because, well...
 * we just know it. So we are going to open it and take a look at its insides.
 * For this, eet_open() won't work, as it needs to have a file on disk to read
 * from and all we have is some data in RAM.
 *
 * So how do we do? One way would be to create a normal file and write down
 * our data, then open it with eet_open(). Another, faster and more efficient
 * if all we want to do is read the file, is to use eet_memopen_read().
 * @until memopen
 *
 * As you can see, the size we got from our previous read was put to good use
 * this time. Unlike the first one where all we had were strings, the size
 * of the data read only serves to demonstrate that we are reading back the
 * entire size of our original @p buf variable.
 *
 * A little peeking to see how many entries the file has and to make an
 * example of eet_num_entries() to get that number when we don't care about
 * their names.
 * @until printf
 *
 * More cheating follows. Just like we knew this was an Eet file, we also know
 * what key to read from, and ontop of that we know that the data in it is not
 * compressed.
 * Knowing all this allows us to take some shortcuts.
 * @until read_direct
 *
 * That's a direct print of our data, whatever that data is. We don't want
 * to worry about having to free it later, so we just used eet_direct_read()
 * to tell Eet to gives a pointer to the internal data in the file, without
 * duplicating it. Since we said that data was not compressed, we shouldn't
 * worry about printing garbage to the screen (and yes, we also know the data
 * is yet another string).
 * We also don't care about the size of the data as it was stored in the file,
 * so we passed NULL as the size parameter.
 * One very important note about this, however, is that we don't care about
 * the size parameter because the data in the file contains the null
 * terminator for the string. So when using Eet to store strings this way,
 * it's very important to consider whether you will keep that final null
 * byte, or to always get the size read and do the necessary checks and copies.
 * It's up to the user and the particular use cases to decide how this will
 * be done.
 *
 * With everything done, close this second file and free the data used to open
 * it. And this is important, we can't free that data until we are done with
 * the file, as Eet is using it. When opening with eet_memopen_read(), the data
 * passed to it must be available for as long as the the file is open.
 * @until }
 *
 * Finally, we close the first file, shutdown all internal resources used by
 * Eet and leave our main function, thus terminating our program.
 * @until return
 *
 * You can look at the full code of the example @ref eet-file.c "here".
 * @{
 */

/**
 * @enum _Eet_File_Mode
 * Modes that a file can be opened.
 */
typedef enum _Eet_File_Mode
{
   EET_FILE_MODE_INVALID = -1,
   EET_FILE_MODE_READ, /**< File is read-only. */
   EET_FILE_MODE_WRITE, /**< File is write-only. */
   EET_FILE_MODE_READ_WRITE /**< File is for both read and write */
} Eet_File_Mode; /**< Modes that a file can be opened. */

/**
 * @enum _Eet_Image_Encoding
 * Specify lossy encoding for image
 * @since 1.10
 */
typedef enum _Eet_Image_Encoding
{
   EET_IMAGE_LOSSLESS = 0,
   EET_IMAGE_JPEG = 1,
   EET_IMAGE_ETC1 = 2,
   EET_IMAGE_ETC2_RGB = 3,
   EET_IMAGE_ETC2_RGBA = 4,
   EET_IMAGE_ETC1_ALPHA = 5,
} Eet_Image_Encoding;

typedef Emile_Colorspace Eet_Colorspace;

#define EET_COLORSPACE_ARGB8888 EMILE_COLORSPACE_ARGB8888
#define EET_COLORSPACE_GRY8 EMILE_COLORSPACE_GRY8
#define EET_COLORSPACE_AGRY88 EMILE_COLORSPACE_AGRY88
#define EET_COLORSPACE_ETC1 EMILE_COLORSPACE_ETC1
#define EET_COLORSPACE_RGB8_ETC2 EMILE_COLORSPACE_RGB8_ETC2
#define EET_COLORSPACE_RGBA8_ETC2_EAC EMILE_COLORSPACE_RGBA8_ETC2_EAC
#define EET_COLORSPACE_ETC1_ALPHA EMILE_COLORSPACE_ETC1_ALPHA

/**
 * @typedef Eet_File
 * Opaque handle that defines an Eet file (or memory).
 *
 * This handle will be returned by the functions eet_open() and
 * eet_memopen_read() and is used by every other function that affects the
 * file in any way. When you are done with it, call eet_close() to close it
 * and, if the file was open for writing, write down to disk any changes made
 * to it.
 *
 * @see eet_open()
 * @see eet_memopen_read()
 * @see eet_close()
 */
typedef struct _Eet_File Eet_File;

/**
 * @typedef Eet_Dictionary
 * Opaque handle that defines a file-backed (mmaped) dictionary of strings.
 */
typedef struct _Eet_Dictionary Eet_Dictionary;

/**
 * @typedef Eet_Entries
 * Eet files may contains multiple Entries per file, this handle describe them. You can get that handle from an iterator given by eet_list_entries().
 *
 * @see eet_list_entries()
 * @since 1.8.0
 */
typedef struct _Eet_Entry Eet_Entry;
struct _Eet_Entry
{
   const char *name; /**< The entry name */

   int offset;       /**< Where it start in the file  */
   int size;         /**< The size on disk */
   int data_size;    /**< The decompressed size if relevant */

   Eina_Bool compression; /**< Is this data compressed ? */
   Eina_Bool ciphered;    /**< Is it ciphered ? */
   Eina_Bool alias;       /**< Is it an alias ? */
};

/**
 * @}
 */

/**
 * Open an eet file on disk, and returns a handle to it.
 * @param file The file path to the eet file. eg: @c "/tmp/file.eet".
 * @param mode The mode for opening. Either #EET_FILE_MODE_READ,
 *        #EET_FILE_MODE_WRITE or #EET_FILE_MODE_READ_WRITE.
 * @return An opened eet file handle.
 * @ingroup Eet_File_Group
 *
 * This function will open an exiting eet file for reading, and build
 * the directory table in memory and return a handle to the file, if it
 * exists and can be read, and no memory errors occur on the way, otherwise
 * NULL will be returned.
 *
 * It will also open an eet file for writing. This will, if successful,
 * delete the original file and replace it with a new empty file, till
 * the eet file handle is closed or flushed. If it cannot be opened for
 * writing or a memory error occurs, NULL is returned.
 *
 * You can also open the file for read/write. If you then write a key that
 * does not exist it will be created, if the key exists it will be replaced
 * by the new data.
 *
 * If the same file is opened multiple times, then the same file handle will
 * be returned as eet maintains an internal list of all currently open
 * files. Note that it considers files opened for read only and those opened
 * for read/write and write only as 2 separate sets. Those that do not write
 * to the file and those that do. Eet will allow 2 handles to the same file
 * if they are in the 2 separate lists/groups. That means opening a file for
 * read only looks in the read only set, and returns a handle to that file
 * handle and increments its reference count. If you open a file for read/write
 * or write only it looks in the write set and returns a handle after
 * incrementing the reference count. You need to close an eet file handle
 * as many times as it has been opened to maintain correct reference counts.
 * Files whose modified timestamp or size do not match those of the existing
 * referenced file handles will not be returned and a new handle will be
 * returned instead.
 *
 * @since 1.0.0
 */
EAPI Eet_File *
eet_open(const char *file,
         Eet_File_Mode mode);

/**
 * Open an eet file on disk from an Eina_File handle, and returns a handle to it.
 * @param file The Eina_File handle to map to an eet file.
 * @return An opened eet file handle.
 * @ingroup Eet_File_Group
 *
 * This function will open an exiting eet file for reading, and build
 * the directory table in memory and return a handle to the file, if it
 * exists and can be read, and no memory errors occur on the way, otherwise
 * NULL will be returned.
 *
 * This function can't open file for writing only read only mode is supported for now.
 *
 * If the same file is opened multiple times, then the same file handle will
 * be returned as eet maintains an internal list of all currently open
 * files. That means opening a file for read only looks in the read only set,
 * and returns a handle to that file handle and increments its reference count.
 * You need to close an eet file handle as many times as it has been opened to
 * maintain correct reference counts.
 *
 * @since 1.8.0
 */
EAPI Eet_File *
eet_mmap(const Eina_File *file);

/**
 * Open an eet file directly from a memory location. The data is not copied,
 * so you must keep it around as long as the eet file is open. There is
 * currently no cache for this kind of Eet_File, so it's reopened every time
 * you use eet_memopen_read.
 * @param data Address of file in memory.
 * @param size Size of memory to be read.
 * @return A handle to the file.
 *
 * Files opened this way will always be in read-only mode.
 *
 * @since 1.1.0
 * @ingroup Eet_File_Group
 */
EAPI Eet_File *
eet_memopen_read(const void *data,
                 size_t size);

/**
 * Get the mode an Eet_File was opened with.
 * @param ef A valid eet file handle.
 * @return The mode ef was opened with.
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI Eet_File_Mode
eet_mode_get(Eet_File *ef);

/**
 * Close an eet file handle and flush pending writes.
 * @param ef A valid eet file handle.
 * @return An eet error identifier.
 *
 * This function will flush any pending writes to disk if the eet file
 * was opened for write, and free all data associated with the file handle
 * and file, and close the file. If it was opened for read (or read/write),
 * the file handle may still be held open internally for caching purposes.
 * To flush speculatively held eet file handles use eet_clearcache().
 *
 * If the eet file handle is not valid nothing will be done.
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 * 
 * @see eet_clearcache()
 */
EAPI Eet_Error
eet_close(Eet_File *ef);

/**
 * Sync content of an eet file handle, flushing pending writes.
 * @param ef A valid eet file handle.
 * @return An eet error identifier.
 *
 * This function will flush any pending writes to disk. The eet file must
 * be opened for write.
 *
 * If the eet file handle is not valid nothing will be done.
 *
 * @since 1.2.4
 * @ingroup Eet_File_Group
 */
EAPI Eet_Error
eet_sync(Eet_File *ef);

/**
 * Return a handle to the shared string dictionary of the Eet file
 * @param ef A valid eet file handle.
 * @return A handle to the dictionary of the file
 *
 * This function returns a handle to the dictionary of an Eet file whose
 * handle is @p ef, if a dictionary exists. NULL is returned otherwise or
 * if the file handle is known to be invalid.
 *
 * @see eet_dictionary_string_check() to know if given string came
 *      from the dictionary or it was dynamically allocated using
 *      the #Eet_Data_Descriptor_Class instructions.
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI Eet_Dictionary *
eet_dictionary_get(Eet_File *ef);

/**
 * Check if a given string comes from a given dictionary
 * @param ed A valid dictionary handle
 * @param string A valid 0 byte terminated C string
 * @return 1 if it is in the dictionary, 0 otherwise
 *
 * This checks the given dictionary to see if the given string is actually
 * inside that dictionary (i.e. comes from it) and returns 1 if it does.
 * If the dictionary handle is invalid, the string is NULL or the string is
 * not in the dictionary, 0 is returned.
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI int
eet_dictionary_string_check(Eet_Dictionary *ed,
                            const char *string);

/**
 * Return the number of strings inside a dictionary
 * @param ed A valid dictionary handle
 * @return the number of strings inside a dictionary
 *
 * @since 1.6.0
 * @ingroup Eet_File_Group
 */
EAPI int
eet_dictionary_count(const Eet_Dictionary *ed);

/**
 * Read a specified entry from an eet file and return data
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param size_ret Number of bytes read from entry and returned.
 * @return The data stored in that entry in the eet file.
 *
 * This function finds an entry in the eet file that is stored under the
 * name specified, and returns that data, decompressed, if successful.
 * NULL is returned if the lookup fails or if memory errors are
 * encountered. It is the job of the calling program to call free() on
 * the returned data. The number of bytes in the returned data chunk are
 * placed in size_ret.
 *
 * If the eet file handle is not valid NULL is returned and size_ret is
 * filled with 0.
 *
 * @see eet_read_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI void *
eet_read(Eet_File *ef,
         const char *name,
         int *size_ret);

/**
 * Read a specified entry from an eet file and return data
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param size_ret Number of bytes read from entry and returned.
 * @return The data stored in that entry in the eet file.
 *
 * This function finds an entry in the eet file that is stored under the
 * name specified, and returns that data if not compressed and successful.
 * NULL is returned if the lookup fails or if memory errors are
 * encountered or if the data is compressed. The calling program must never
 * call free() on the returned data. The number of bytes in the returned
 * data chunk are placed in size_ret.
 *
 * If the eet file handle is not valid NULL is returned and size_ret is
 * filled with 0.
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI const void *
eet_read_direct(Eet_File *ef,
                const char *name,
                int *size_ret);

/**
 * Write a specified entry to an eet file handle
 * @param ef A valid eet file handle opened for writing.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param data Pointer to the data to be stored.
 * @param size Length in bytes in the data to be stored.
 * @param compress Compression flags (1 == compress, 0 = don't compress).
 * @return bytes written on successful write, 0 on failure.
 *
 * This function will write the specified chunk of data to the eet file
 * and return greater than 0 on success. 0 will be returned on failure.
 *
 * The eet file handle must be a valid file handle for an eet file opened
 * for writing. If it is not, 0 will be returned and no action will be
 * performed.
 *
 * Name, and data must not be NULL, and size must be > 0. If these
 * conditions are not met, 0 will be returned.
 *
 * The data will be copied (and optionally compressed) in ram, pending
 * a flush to disk (it will stay in ram till the eet file handle is
 * closed though).
 *
 * @see eet_write_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI int
eet_write(Eet_File *ef,
          const char *name,
          const void *data,
          int size,
          int compress);

/**
 * Delete a specified entry from an Eet file being written or re-written
 * @param ef A valid eet file handle opened for writing.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @return Success or failure of the delete.
 *
 * This function will delete the specified chunk of data from the eet file
 * and return greater than 0 on success. 0 will be returned on failure.
 *
 * The eet file handle must be a valid file handle for an eet file opened
 * for writing. If it is not, 0 will be returned and no action will be
 * performed.
 *
 * Name, must not be NULL, otherwise 0 will be returned.
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI int
eet_delete(Eet_File *ef,
           const char *name);

/**
 * Alias a specific section to another one. Destination may exist or not,
 * no checks are done.
 * @param ef A valid eet file handle opened for writing.
 * @param name Name of the new entry. eg: "/base/file_i_want".
 * @param destination Actual source of the aliased entry eg: "/base/the_real_stuff_i_want".
 * @param compress Compression flags (1 == compress, 0 = don't compress).
 * @return EINA_TRUE on success, EINA_FALSE on failure.
 *
 * Name and Destination must not be NULL, otherwise EINA_FALSE will be returned.
 * The equivalent of this would be calling 'ln -s destination name'
 *
 * @since 1.3.3
 * @ingroup Eet_File_Group
 */
EAPI Eina_Bool
eet_alias(Eet_File *ef,
          const char *name,
          const char *destination,
          int compress);

/**
 * Retrieve the filename of an Eet_File
 * @param ef A valid eet file handle opened for writing.
 * @return The stringshared file string opened with eet_open(), or NULL on error
 *
 * @note This function will return NULL for files opened with eet_memopen_read()
 *
 * @since 1.6
 * @ingroup Eet_File_Group
 */
EAPI const char *
eet_file_get(Eet_File *ef);

/**
 * Retrieve the destination name of an alias
 * @param ef A valid eet file handle opened for writing
 * @param name Name of the entry. eg: "/base/file_i_want"
 * @return Destination of the alias. eg: "/base/the_real_stuff_i_want", NULL on failure
 *
 * Name must not be NULL, otherwise NULL will be returned.
 *
 * @since 1.5
 * @ingroup Eet_File_Group
 */
EAPI const char *
eet_alias_get(Eet_File *ef,
              const char *name);

/**
 * List all entries in eet file matching shell glob.
 * @param ef A valid eet file handle.
 * @param glob A shell glob to match against.
 * @param count_ret Number of entries found to match.
 * @return Pointer to an array of strings.
 *
 * This function will list all entries in the eet file matching the
 * supplied shell glob and return an allocated list of their names, if
 * there are any, and if no memory errors occur.
 *
 * The eet file handle must be valid and glob must not be NULL, or NULL
 * will be returned and count_ret will be filled with 0.
 *
 * The calling program must call free() on the array returned, but NOT
 * on the string pointers in the array. They are taken as read-only
 * internals from the eet file handle. They are only valid as long as
 * the file handle is not closed. When it is closed those pointers in the
 * array are now not valid and should not be used.
 *
 * On success the array returned will have a list of string pointers
 * that are the names of the entries that matched, and count_ret will have
 * the number of entries in this array placed in it.
 *
 * Hint: an easy way to list all entries in an eet file is to use a glob
 * value of "*".
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI char **
eet_list(Eet_File *ef,
         const char *glob,
         int *count_ret);

/**
 * Return an iterator that will describe each entry of an Eet_File.
 * @param ef A valid eet file handle.
 * @return An interator of Eet_Entry.
 *
 * @since 1.8.0
 * @ingroup Eet_File_Group
 */

EAPI Eina_Iterator *eet_list_entries(Eet_File *ef);

/**
 * Return the number of entries in the specified eet file.
 * @param ef A valid eet file handle.
 * @return Number of entries in ef or -1 if the number of entries
 *         cannot be read due to open mode restrictions.
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI int
eet_num_entries(Eet_File *ef);

/**
 * @defgroup Eet_File_Cipher_Group Eet File Ciphered Main Functions
 *
 * Most of the @ref Eet_File_Group have alternative versions that
 * accounts for ciphers to protect their content.
 *
 * @see @ref Eet_Cipher_Group
 *
 * @ingroup Eet_File_Group
 */

/**
 * Read a specified entry from an eet file and return data using a cipher.
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param size_ret Number of bytes read from entry and returned.
 * @param cipher_key The key to use as cipher.
 * @return The data stored in that entry in the eet file.
 *
 * This function finds an entry in the eet file that is stored under the
 * name specified, and returns that data, decompressed, if successful.
 * NULL is returned if the lookup fails or if memory errors are
 * encountered. It is the job of the calling program to call free() on
 * the returned data. The number of bytes in the returned data chunk are
 * placed in size_ret.
 *
 * If the eet file handle is not valid NULL is returned and size_ret is
 * filled with 0.
 *
 * @see eet_read()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Cipher_Group
 */
EAPI void *
eet_read_cipher(Eet_File *ef,
                const char *name,
                int *size_ret,
                const char *cipher_key);

/**
 * Write a specified entry to an eet file handle using a cipher.
 * @param ef A valid eet file handle opened for writing.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param data Pointer to the data to be stored.
 * @param size Length in bytes in the data to be stored.
 * @param compress Compression flags (1 == compress, 0 = don't compress).
 * @param cipher_key The key to use as cipher.
 * @return bytes written on successful write, 0 on failure.
 *
 * This function will write the specified chunk of data to the eet file
 * and return greater than 0 on success. 0 will be returned on failure.
 *
 * The eet file handle must be a valid file handle for an eet file opened
 * for writing. If it is not, 0 will be returned and no action will be
 * performed.
 *
 * Name, and data must not be NULL, and size must be > 0. If these
 * conditions are not met, 0 will be returned.
 *
 * The data will be copied (and optionally compressed) in ram, pending
 * a flush to disk (it will stay in ram till the eet file handle is
 * closed though).
 *
 * @see eet_write()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Cipher_Group
 */
EAPI int
eet_write_cipher(Eet_File *ef,
                 const char *name,
                 const void *data,
                 int size,
                 int compress,
                 const char *cipher_key);

/**
 * @defgroup Eet_File_Image_Group Image Store and Load
 * @ingroup Eet
 *
 * Eet efficiently stores and loads images, including alpha
 * channels and lossy compressions.
 *
 * Eet can handle both lossy compression with different levels of quality and
 * non-lossy compression with different compression levels. It's also possible,
 * given an image data, to only read its header to get the image information
 * without decoding the entire content for it.
 *
 * The encode family of functions will take an image raw buffer and its
 * parameters and compress it in memory, returning the new buffer.
 * Likewise, the decode functions will read from the given location in memory
 * and return the uncompressed image.
 *
 * The read and write functions will, respectively, encode and decode to or
 * from an Eet file, under the specified key.
 *
 * These functions are fairly low level and the same functionality can be
 * achieved using Evas and Edje, making it much easier to work with images
 * as well as not needing to worry about things like scaling them.
 */

/**
 * Read just the header data for an image and dont decode the pixels.
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param w A pointer to the unsigned int to hold the width in pixels.
 * @param h A pointer to the unsigned int to hold the height in pixels.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on successful decode, 0 otherwise
 *
 * Reads and decodes the image header data stored under the given key and
 * Eet file.
 *
 * The information decoded is placed in each of the parameters, which must be
 * provided. The width and height, measured in pixels, will be stored under
 * the variables pointed by @p w and @p h, respectively. If the read or
 * decode of the header fails, this values will be 0. The @p alpha parameter
 * will be 1 or 0, denoting if the alpha channel of the image is used or not.
 * If the image was losslessly compressed, the @p compress parameter will hold
 * the compression amount used, ranging from 0 to 9 and @p lossy will be 0.
 * In the case of lossy compression, @p lossy will be 1, and the compression
 * quality will be placed under @p quality, with a value ranging from 0 to 100.
 *
 * @see eet_data_image_header_decode()
 * @see eet_data_image_header_read_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Group
 */
EAPI int
eet_data_image_header_read(Eet_File *ef,
                           const char *name,
                           unsigned int *w,
                           unsigned int *h,
                           int *alpha,
                           int *compress,
                           int *quality,
                           Eet_Image_Encoding *lossy);

/**
 * Read image data from the named key in the eet file.
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param w A pointer to the unsigned int to hold the width in pixels.
 * @param h A pointer to the unsigned int to hold the height in pixels.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return The image pixel data decoded
 *
 * Reads and decodes the image stored in the given Eet file under the named
 * key.
 *
 * The returned pixel data is a linear array of pixels starting from the
 * top-left of the image, scanning row by row from left to right. Each pile
 * is a 32bit value, with the high byte being the alpha channel, the next being
 * red, then green, and the low byte being blue.
 *
 * The rest of the parameters are the same as in eet_data_image_header_read().
 *
 * On success the function returns a pointer to the image data decoded. The
 * calling application is responsible for calling free() on the image data
 * when it is done with it. On failure NULL is returned and the parameter
 * values may not contain any sensible data.
 *
 * @see eet_data_image_header_read()
 * @see eet_data_image_decode()
 * @see eet_data_image_read_cipher()
 * @see eet_data_image_read_to_surface()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Group
 */
EAPI void *
eet_data_image_read(Eet_File *ef,
                    const char *name,
                    unsigned int *w,
                    unsigned int *h,
                    int *alpha,
                    int *compress,
                    int *quality,
                    Eet_Image_Encoding *lossy);

/**
 * Read image data from the named key in the eet file and store it in the given buffer.
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param src_x The starting x coordinate from where to dump the stream.
 * @param src_y The starting y coordinate from where to dump the stream.
 * @param d A pointer to the pixel surface.
 * @param w The expected width in pixels of the pixel surface to decode.
 * @param h The expected height in pixels of the pixel surface to decode.
 * @param row_stride The length of a pixels line in the destination surface.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on success, 0 otherwise.
 *
 * Reads and decodes the image stored in the given Eet file, placing the
 * resulting pixel data in the buffer pointed by the user.
 *
 * Like eet_data_image_read(), it takes the image data stored under the
 * @p name key in the @p ef file, but instead of returning a new buffer with
 * the pixel data, it places the result in the buffer pointed by @p d, which
 * must be provided by the user and of sufficient size to hold the requested
 * portion of the image.
 *
 * The @p src_x and @p src_y parameters indicate the top-left corner of the
 * section of the image to decode. These have to be higher or equal than 0 and
 * less than the respective total width and height of the image. The width
 * and height of the section of the image to decode are given in @p w and @p h
 * and also can't be higher than the total width and height of the image.
 *
 * The @p row_stride parameter indicates the length in bytes of each line in
 * the destination buffer and it has to be at least @p w * 4.
 *
 * All the other parameters are the same as in eet_data_image_read().
 *
 * On success the function returns 1, and 0 on failure. On failure the
 * parameter values may not contain any sensible data.
 *
 * @see eet_data_image_read()
 * @see eet_data_image_decode()
 * @see eet_data_image_decode_to_surface()
 * @see eet_data_image_read_to_surface_cipher()
 * @see eet_data_image_decode_to_cspace_surface_cipher()
 *
 * @since 1.0.2
 * @ingroup Eet_File_Image_Group
 */
EAPI int
eet_data_image_read_to_surface(Eet_File *ef,
                               const char *name,
                               unsigned int src_x,
                               unsigned int src_y,
                               unsigned int *d,
                               unsigned int w,
                               unsigned int h,
                               unsigned int row_stride,
                               int *alpha,
                               int *compress,
                               int *quality,
                               Eet_Image_Encoding *lossy);

/**
 * Write image data to the named key in an eet file.
 * @param ef A valid eet file handle opened for writing.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param data A pointer to the image pixel data.
 * @param w The width of the image in pixels.
 * @param h The height of the image in pixels.
 * @param alpha The alpha channel flag.
 * @param compress The compression amount.
 * @param quality The quality encoding amount.
 * @param lossy The lossiness flag.
 * @return Success if the data was encoded and written or not.
 *
 * This function takes image pixel data and encodes it in an eet file
 * stored under the supplied name key, and returns how many bytes were
 * actually written to encode the image data.
 *
 * The data expected is the same format as returned by eet_data_image_read.
 * If this is not the case weird things may happen. Width and height must
 * be between 1 and 8000 pixels. The alpha flags can be 0 or 1 (0 meaning
 * the alpha values are not useful and 1 meaning they are). Compress can
 * be from 0 to 9 (0 meaning no compression, 9 meaning full compression).
 * This is only used if the image is not lossily encoded. Quality is used on
 * lossy compression and should be a value from 0 to 100. The lossy flag
 * can be 0 or 1. 0 means encode losslessly and 1 means to encode with
 * image quality loss (but then have a much smaller encoding).
 *
 * On success this function returns the number of bytes that were required
 * to encode the image data, or on failure it returns 0.
 *
 * @see eet_data_image_read()
 * @see eet_data_image_encode()
 * @see eet_data_image_write_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Group
 */
EAPI int
eet_data_image_write(Eet_File *ef,
                     const char *name,
                     const void *data,
                     unsigned int w,
                     unsigned int h,
                     int alpha,
                     int compress,
                     int quality,
                     Eet_Image_Encoding lossy);

/**
 * Decode Image data header only to get information.
 * @param data The encoded pixel data.
 * @param size The size, in bytes, of the encoded pixel data.
 * @param w A pointer to the unsigned int to hold the width in pixels.
 * @param h A pointer to the unsigned int to hold the height in pixels.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on success, 0 on failure.
 *
 * This function works exactly like eet_data_image_header_read(), but instead
 * of reading from an Eet file, it takes the buffer of size @p size pointed
 * by @p data, which must be a valid Eet encoded image.
 *
 * On success the function returns 1 indicating the header was read and
 * decoded properly, or 0 on failure.
 *
 * @see eet_data_image_header_read()
 * @see eet_data_image_header_decode_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Group
 */
EAPI int
eet_data_image_header_decode(const void *data,
                             int size,
                             unsigned int *w,
                             unsigned int *h,
                             int *alpha,
                             int *compress,
                             int *quality,
                             Eet_Image_Encoding *lossy);

/**
 * Decode Image data into pixel data.
 * @param data The encoded pixel data.
 * @param size The size, in bytes, of the encoded pixel data.
 * @param w A pointer to the unsigned int to hold the width in pixels.
 * @param h A pointer to the unsigned int to hold the height in pixels.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return The image pixel data decoded
 *
 * This function takes encoded pixel data and decodes it into raw RGBA
 * pixels on success.
 *
 * It works exactly like eet_data_image_read(), but it takes the encoded
 * data in the @p data buffer of size @p size, instead of reading from a file.
 * All the others parameters are also the same.
 *
 * On success the function returns a pointer to the image data decoded. The
 * calling application is responsible for calling free() on the image data
 * when it is done with it. On failure NULL is returned and the parameter
 * values may not contain any sensible data.
 *
 * @see eet_data_image_read()
 * @see eet_data_image_decode_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Group
 */
EAPI void *
eet_data_image_decode(const void *data,
                      int size,
                      unsigned int *w,
                      unsigned int *h,
                      int *alpha,
                      int *compress,
                      int *quality,
                      Eet_Image_Encoding *lossy);

/**
 * Decode Image data into pixel data and stores in the given buffer.
 * @param data The encoded pixel data.
 * @param size The size, in bytes, of the encoded pixel data.
 * @param src_x The starting x coordinate from where to dump the stream.
 * @param src_y The starting y coordinate from where to dump the stream.
 * @param d A pointer to the pixel surface.
 * @param w The expected width in pixels of the pixel surface to decode.
 * @param h The expected height in pixels of the pixel surface to decode.
 * @param row_stride The length of a pixels line in the destination surface.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on success, 0 otherwise.
 *
 * Like eet_data_image_read_to_surface(), but reading the given @p data buffer
 * instead of a file.
 *
 * On success the function returns 1, and 0 on failure. On failure the
 * parameter values may not contain any sensible data.
 *
 * @see eet_data_image_read_to_surface()
 * @see eet_data_image_decode_to_surface_cipher()
 *
 * @since 1.0.2
 * @ingroup Eet_File_Image_Group
 */
EAPI int
eet_data_image_decode_to_surface(const void *data,
                                 int size,
                                 unsigned int src_x,
                                 unsigned int src_y,
                                 unsigned int *d,
                                 unsigned int w,
                                 unsigned int h,
                                 unsigned int row_stride,
                                 int *alpha,
                                 int *compress,
                                 int *quality,
                                 Eet_Image_Encoding *lossy);

/**
 * Encode image data for storage or transmission.
 * @param data A pointer to the image pixel data.
 * @param size_ret A pointer to an int to hold the size of the returned data.
 * @param w The width of the image in pixels.
 * @param h The height of the image in pixels.
 * @param alpha The alpha channel flag.
 * @param compress The compression amount.
 * @param quality The quality encoding amount.
 * @param lossy The lossiness flag.
 * @return The encoded image data.
 *
 * This function stakes image pixel data and encodes it with compression and
 * possible loss of quality (as a trade off for size) for storage or
 * transmission to another system.
 *
 * It works like eet_data_image_write(), but instead of writing the encoded
 * image into an Eet file, it allocates a new buffer of the size required and
 * returns the encoded data in it.
 *
 * On success this function returns a pointer to the encoded data that you
 * can free with free() when no longer needed.
 *
 * @see eet_data_image_write()
 * @see eet_data_image_read()
 * @see eet_data_image_encode_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Group
 */
EAPI void *
eet_data_image_encode(const void *data,
                      int *size_ret,
                      unsigned int w,
                      unsigned int h,
                      int alpha,
                      int compress,
                      int quality,
                      Eet_Image_Encoding lossy);

/**
 * @defgroup Eet_File_Image_Cipher_Group Image Store and Load using a Cipher
 *
 * Most of the @ref Eet_File_Image_Group have alternative versions
 * that accounts for ciphers to protect their content.
 *
 * @see @ref Eet_Cipher_Group
 *
 * @ingroup Eet_File_Image_Group
 */

/**
 * Read just the header data for an image and dont decode the pixels using a cipher.
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param cipher_key The key to use as cipher.
 * @param w A pointer to the unsigned int to hold the width in pixels.
 * @param h A pointer to the unsigned int to hold the height in pixels.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on successful decode, 0 otherwise
 *
 * This function reads an image from an eet file stored under the named
 * key in the eet file and return a pointer to the decompressed pixel data.
 *
 * The other parameters of the image (width, height etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pixel is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns 1 indicating the header was read and
 * decoded properly, or 0 on failure.
 *
 * @see eet_data_image_header_read()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Cipher_Group
 */
EAPI int
eet_data_image_header_read_cipher(Eet_File *ef,
                                  const char *name,
                                  const char *cipher_key,
                                  unsigned int *w,
                                  unsigned int *h,
                                  int *alpha,
                                  int *compress,
                                  int *quality,
                                  Eet_Image_Encoding *lossy);

/**
 * Get the colorspace Eet can decode into of a given eet image ressource
 *
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param cipher_key The key to use as cipher.
 * @param cspaces Returned pointer by Eet to a list of possible decoding colorspace finished by @c EET_COLORSPACE_ARGB8888. If @c NULL, only EET_COLORSPACE_ARGB8888 is supported.
 * @return 1 on successful get, 0 otherwise.
 *
 * @since 1.10.0
 * @ingroup Eet_File_Image_Group
 */
EAPI int
eet_data_image_colorspace_get(Eet_File *ef,
                              const char *name,
                              const char *cipher_key,
                              const Eet_Colorspace **cspaces);

/**
 * Read image data from the named key in the eet file using a cipher.
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param cipher_key The key to use as cipher.
 * @param w A pointer to the unsigned int to hold the width in pixels.
 * @param h A pointer to the unsigned int to hold the height in pixels.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return The image pixel data decoded
 *
 * This function reads an image from an eet file stored under the named
 * key in the eet file and return a pointer to the decompressed pixel data.
 *
 * The other parameters of the image (width, height etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pixel is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns a pointer to the image data decoded. The
 * calling application is responsible for calling free() on the image data
 * when it is done with it. On failure NULL is returned and the parameter
 * values may not contain any sensible data.
 *
 * @see eet_data_image_read()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Cipher_Group
 */
EAPI void *
eet_data_image_read_cipher(Eet_File *ef,
                           const char *name,
                           const char *cipher_key,
                           unsigned int *w,
                           unsigned int *h,
                           int *alpha,
                           int *compress,
                           int *quality,
                           Eet_Image_Encoding *lossy);

/**
 * Read image data from the named key in the eet file using a cipher.
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param cipher_key The key to use as cipher.
 * @param src_x The starting x coordinate from where to dump the stream.
 * @param src_y The starting y coordinate from where to dump the stream.
 * @param d A pointer to the pixel surface.
 * @param w The expected width in pixels of the pixel surface to decode.
 * @param h The expected height in pixels of the pixel surface to decode.
 * @param row_stride The length of a pixels line in the destination surface.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on success, 0 otherwise.
 *
 * This function reads an image from an eet file stored under the named
 * key in the eet file and store the decompressed pixel data in the provided
 * surface with an @c EET_COLORSPACE_ARGB8888 colorspace.
 *
 * The other parameters of the image (width, height etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pixel is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns 1, and 0 on failure. On failure the
 * parameter values may not contain any sensible data.
 *
 * @see eet_data_image_read_to_surface()
 * @see eet_data_image_decode_to_cspace_surface_cipher()
 *
 * @since 1.0.2
 * @ingroup Eet_File_Image_Cipher_Group
 */
EAPI int
eet_data_image_read_to_surface_cipher(Eet_File *ef,
                                      const char *name,
                                      const char *cipher_key,
                                      unsigned int src_x,
                                      unsigned int src_y,
                                      unsigned int *d,
                                      unsigned int w,
                                      unsigned int h,
                                      unsigned int row_stride,
                                      int *alpha,
                                      int *compress,
                                      int *quality,
                                      Eet_Image_Encoding *lossy);


/**
 * Read image data from the named key in the eet file using a cipher.
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param cipher_key The key to use as cipher.
 * @param src_x The starting x coordinate from where to dump the stream.
 * @param src_y The starting y coordinate from where to dump the stream.
 * @param d A pointer to the pixel surface.
 * @param w The expected width in pixels of the pixel surface to decode.
 * @param h The expected height in pixels of the pixel surface to decode.
 * @param row_stride The length of a pixels line in the destination surface.
 * @param cspace The color space of the pixels bsurface.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param comp A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on success, 0 otherwise.
 *
 * This function reads an image from an eet file stored under the named
 * key in the eet file and store the decompressed pixel data in the provided
 * surface colorspace.
 *
 * The other parameters of the image (width, height etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pixel is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns 1, and 0 on failure. On failure the
 * parameter values may not contain any sensible data.
 *
 * @see eet_data_image_read_to_surface()
 * @see eet_data_image_decode_to_cspace_surface_cipher()
 * @see eet_data_image_read_to_surface_cipher()
 *
 * @since 1.10.0
 * @ingroup Eet_File_Image_Cipher_Group
 */
EAPI int
eet_data_image_read_to_cspace_surface_cipher(Eet_File     *ef,
                                             const char   *name,
                                             const char   *cipher_key,
                                             unsigned int  src_x,
                                             unsigned int  src_y,
                                             unsigned int *d,
                                             unsigned int  w,
                                             unsigned int  h,
                                             unsigned int  row_stride,
                                             Eet_Colorspace cspace,
                                             int          *alpha,
                                             int          *comp,
                                             int          *quality,
                                             Eet_Image_Encoding *lossy);


/**
 * Read image data from the named key in the eet file using a cipher.
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param cipher_key The key to use as cipher.
 * @param src_x The starting x coordinate from where to dump the stream.
 * @param src_y The starting y coordinate from where to dump the stream.
 * @param d A pointer to the pixel surface.
 * @param w The expected width in pixels of the pixel surface to decode.
 * @param h The expected height in pixels of the pixel surface to decode.
 * @param row_stride The length of a pixels line in the destination surface.
 * @param cspace The color space of the pixel surface
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param comp A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on success, 0 otherwise.
 *
 * This function reads an image from an eet file stored under the named
 * key in the eet file and store the decompressed pixels in the specified
 * color space inside the given surface.
 *
 * The other parameters of the image (width, height etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pixel is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns 1, and 0 on failure. On failure the
 * parameter values may not contain any sensible data.
 *
 * @see eet_data_image_read_to_surface()
 * @see eet_data_image_read_to_surface_cipher()
 *
 * @since 1.10.0
 * @ingroup Eet_File_Image_Cipher_Group
 */

EAPI int
eet_data_image_decode_to_cspace_surface_cipher(const void   *data,
                                               const char   *cipher_key,
                                               int           size,
                                               unsigned int  src_x,
                                               unsigned int  src_y,
                                               unsigned int *d,
                                               unsigned int  w,
                                               unsigned int  h,
                                               unsigned int  row_stride,
                                               Eet_Colorspace cspace,
                                               int          *alpha,
                                               int          *comp,
                                               int          *quality,
                                               Eet_Image_Encoding *lossy);

/**
 * Write image data to the named key in an eet file using a cipher.
 * @param ef A valid eet file handle opened for writing.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param cipher_key The key to use as cipher.
 * @param data A pointer to the image pixel data.
 * @param w The width of the image in pixels.
 * @param h The height of the image in pixels.
 * @param alpha The alpha channel flag.
 * @param compress The compression amount.
 * @param quality The quality encoding amount.
 * @param lossy The lossiness flag.
 * @return Success if the data was encoded and written or not.
 *
 * This function takes image pixel data and encodes it in an eet file
 * stored under the supplied name key, and returns how many bytes were
 * actually written to encode the image data.
 *
 * The data expected is the same format as returned by eet_data_image_read.
 * If this is not the case weird things may happen. Width and height must
 * be between 1 and 8000 pixels. The alpha flags can be 0 or 1 (0 meaning
 * the alpha values are not useful and 1 meaning they are). Compress can
 * be from 0 to 9 (0 meaning no compression, 9 meaning full compression).
 * This is only used if the image is not lossily encoded. Quality is used on
 * lossy compression and should be a value from 0 to 100. The lossy flag
 * can be 0 or 1. 0 means encode losslessly and 1 means to encode with
 * image quality loss (but then have a much smaller encoding).
 *
 * On success this function returns the number of bytes that were required
 * to encode the image data, or on failure it returns 0.
 *
 * @see eet_data_image_write()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Cipher_Group
 */
EAPI int
eet_data_image_write_cipher(Eet_File *ef,
                            const char *name,
                            const char *cipher_key,
                            const void *data,
                            unsigned int w,
                            unsigned int h,
                            int alpha,
                            int compress,
                            int quality,
                            Eet_Image_Encoding lossy);

/**
 * Decode Image data header only to get information using a cipher.
 * @param data The encoded pixel data.
 * @param cipher_key The key to use as cipher.
 * @param size The size, in bytes, of the encoded pixel data.
 * @param w A pointer to the unsigned int to hold the width in pixels.
 * @param h A pointer to the unsigned int to hold the height in pixels.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on success, 0 on failure.
 *
 * This function takes encoded pixel data and decodes it into raw RGBA
 * pixels on success.
 *
 * The other parameters of the image (width, height etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pixel is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns 1 indicating the header was read and
 * decoded properly, or 0 on failure.
 *
 * @see eet_data_image_header_decode()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Cipher_Group
 */
EAPI int
eet_data_image_header_decode_cipher(const void *data,
                                    const char *cipher_key,
                                    int size,
                                    unsigned int *w,
                                    unsigned int *h,
                                    int *alpha,
                                    int *compress,
                                    int *quality,
                                    Eet_Image_Encoding *lossy);

/**
 * Decode Image data into pixel data using a cipher.
 * @param data The encoded pixel data.
 * @param cipher_key The key to use as cipher.
 * @param size The size, in bytes, of the encoded pixel data.
 * @param w A pointer to the unsigned int to hold the width in pixels.
 * @param h A pointer to the unsigned int to hold the height in pixels.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return The image pixel data decoded
 *
 * This function takes encoded pixel data and decodes it into raw RGBA
 * pixels on success.
 *
 * The other parameters of the image (width, height etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pixel is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns a pointer to the image data decoded. The
 * calling application is responsible for calling free() on the image data
 * when it is done with it. On failure NULL is returned and the parameter
 * values may not contain any sensible data.
 *
 * @see eet_data_image_decode()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Cipher_Group
 */
EAPI void *
eet_data_image_decode_cipher(const void *data,
                             const char *cipher_key,
                             int size,
                             unsigned int *w,
                             unsigned int *h,
                             int *alpha,
                             int *compress,
                             int *quality,
                             Eet_Image_Encoding *lossy);

/**
 * Decode Image data into pixel data using a cipher.
 * @param data The encoded pixel data.
 * @param cipher_key The key to use as cipher.
 * @param size The size, in bytes, of the encoded pixel data.
 * @param src_x The starting x coordinate from where to dump the stream.
 * @param src_y The starting y coordinate from where to dump the stream.
 * @param d A pointer to the pixel surface.
 * @param w The expected width in pixels of the pixel surface to decode.
 * @param h The expected height in pixels of the pixel surface to decode.
 * @param row_stride The length of a pixels line in the destination surface.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on success, 0 otherwise.
 *
 * This function takes encoded pixel data and decodes it into raw RGBA
 * pixels on success.
 *
 * The other parameters of the image (alpha, compress etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pixel is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns 1, and 0 on failure. On failure the
 * parameter values may not contain any sensible data.
 *
 * @see eet_data_image_decode_to_surface()
 *
 * @since 1.0.2
 * @ingroup Eet_File_Image_Cipher_Group
 */
EAPI int
eet_data_image_decode_to_surface_cipher(const void *data,
                                        const char *cipher_key,
                                        int size,
                                        unsigned int src_x,
                                        unsigned int src_y,
                                        unsigned int *d,
                                        unsigned int w,
                                        unsigned int h,
                                        unsigned int row_stride,
                                        int *alpha,
                                        int *compress,
                                        int *quality,
                                        Eet_Image_Encoding *lossy);

/**
 * Encode image data for storage or transmission using a cipher.
 * @param data A pointer to the image pixel data.
 * @param cipher_key The key to use as cipher.
 * @param size_ret A pointer to an int to hold the size of the returned data.
 * @param w The width of the image in pixels.
 * @param h The height of the image in pixels.
 * @param alpha The alpha channel flag.
 * @param compress The compression amount.
 * @param quality The quality encoding amount.
 * @param lossy The lossiness flag.
 * @return The encoded image data.
 *
 * This function stakes image pixel data and encodes it with compression and
 * possible loss of quality (as a trade off for size) for storage or
 * transmission to another system.
 *
 * The data expected is the same format as returned by eet_data_image_read.
 * If this is not the case weird things may happen. Width and height must
 * be between 1 and 8000 pixels. The alpha flags can be 0 or 1 (0 meaning
 * the alpha values are not useful and 1 meaning they are). Compress can
 * be from 0 to 9 (0 meaning no compression, 9 meaning full compression).
 * This is only used if the image is not lossily encoded. Quality is used on
 * lossy compression and should be a value from 0 to 100. The lossy flag
 * can be 0 or 1. 0 means encode losslessly and 1 means to encode with
 * image quality loss (but then have a much smaller encoding).
 *
 * On success this function returns a pointer to the encoded data that you
 * can free with free() when no longer needed.
 *
 * @see eet_data_image_encode()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Cipher_Group
 */
EAPI void *
eet_data_image_encode_cipher(const void *data,
                             const char *cipher_key,
                             unsigned int w,
                             unsigned int h,
                             int alpha,
                             int compress,
                             int quality,
                             Eet_Image_Encoding lossy,
                             int *size_ret);

/**
 * @defgroup Eet_Cipher_Group Cipher, Identity and Protection Mechanisms
 * @ingroup Eet
 *
 * Eet allows one to protect entries of an #Eet_File
 * individually. This may be used to ensure data was not tampered or
 * that third party does not read your data.
 *
 * @see @ref Eet_File_Cipher_Group
 * @see @ref Eet_File_Image_Cipher_Group
 *
 * @{
 */

/**
 * @typedef Eet_Key
 * Opaque handle that defines an identity (also known as key)
 * in Eet's cipher system.
 */
typedef struct _Eet_Key Eet_Key;

/**
 * @}
 */

/**
 * Callback used to request if needed the password of a private key.
 *
 * @param buffer the buffer where to store the password.
 * @param size the maximum password size (size of buffer, including '@\0').
 * @param rwflag if the buffer is also readable or just writable.
 * @param data currently unused, may contain some context in future.
 * @return 1 on success and password was set to @p buffer, 0 on failure.
 *
 * @since 1.2.0
 * @ingroup Eet_Cipher_Group
 */
typedef int (*Eet_Key_Password_Callback)(char *buffer, int size, int rwflag, void *data);

/**
 * Create an Eet_Key needed for signing an eet file.
 *
 * The certificate should provide the public that match the private key.
 * No verification is done to ensure that.
 *
 * @param certificate_file The file where to find the certificate.
 * @param private_key_file The file that contains the private key.
 * @param cb Function to callback if password is required to unlock
 *        private key.
 * @return A key handle to use, or @c NULL on failure.
 *
 * @see eet_identity_close()
 *
 * @warning You need to compile signature support in EET.
 * @since 1.2.0
 * @ingroup Eet_Cipher_Group
 */
EAPI Eet_Key *
eet_identity_open(const char *certificate_file,
                  const char *private_key_file,
                  Eet_Key_Password_Callback cb);

/**
 * Close and release all resource used by an Eet_Key.  An
 * reference counter prevent it from being freed until all file
 * using it are also closed.
 *
 * @param key the key handle to close and free resources.
 *
 * @since 1.2.0
 * @ingroup Eet_Cipher_Group
 */
EAPI void
eet_identity_close(Eet_Key *key);

/**
 * Set a key to sign a file
 *
 * @param ef the file to set the identity.
 * @param key the key handle to set as identity.
 * @return #EET_ERROR_BAD_OBJECT if @p ef is invalid or
 *         #EET_ERROR_NONE on success.
 *
 * @since 1.2.0
 * @ingroup Eet_Cipher_Group
 */
EAPI Eet_Error
eet_identity_set(Eet_File *ef,
                 Eet_Key *key);

/**
 * Display both private and public key of an Eet_Key.
 *
 * @param key the handle to print.
 * @param out where to print.
 *
 * @warning You need to compile signature support in EET.
 * @since 1.2.0
 * @ingroup Eet_Cipher_Group
 */
EAPI void
eet_identity_print(Eet_Key *key,
                   FILE *out);

/**
 * Compare the identify certificate of an eet file against a stored one
 *
 * @param ef The file handle to check the identify of
 * @param certificate_file The path to the certificate file
 * @return EINA_TRUE if the certificates match, otherwise EINA_FALSE;
 *
 * The @p ef file handle mus be valid, and a signed file, otherwise
 * checking will fail. The path to the certificate file must be a valid
 * file path to a 'pem' format file (the same used for siging with
 * eet_identity_open() as a certificate file).
 *
 * @note This function can not be used to provide any security mecanism. You
 * need to check your x509 certificate against a chain of trust to have a proper
 * security. This is just a convenience test function.
 * @warning You need to compile signature support in EET.
 * @since 1.13
 * @ingroup Eet_Cipher_Group
 */
EAPI Eina_Bool
eet_identity_verify(Eet_File *ef,
                    const char *certificate_file);

/**
 * Get the x509 der certificate associated with an Eet_File. Will return NULL
 * if the file is not signed.
 *
 * @param ef The file handle to query.
 * @param der_length The length of returned data, may be @c NULL.
 * @return the x509 certificate or @c NULL on error.
 *
 * @since 1.2.0
 * @ingroup Eet_Cipher_Group
 */
EAPI const void *
eet_identity_x509(Eet_File *ef,
                  int *der_length);

/**
 * Get the raw signature associated with an Eet_File. Will return NULL
 * if the file is not signed.
 *
 * @param ef The file handle to query.
 * @param signature_length The length of returned data, may be @c NULL.
 * @return the raw signature or @c NULL on error.
 *
 * @ingroup Eet_Cipher_Group
 */
EAPI const void *
eet_identity_signature(Eet_File *ef,
                       int *signature_length);

/**
 * Get the SHA1 associated with a file. Could be the one used to
 * sign the data or if the data where not signed, it will be the
 * SHA1 of the file.
 *
 * @param ef The file handle to query.
 * @param sha1_length The length of returned data, may be @c NULL.
 * @return the associated SHA1 or @c NULL on error.
 *
 * @since 1.2.0
 * @ingroup Eet_Cipher_Group
 */
EAPI const void *
eet_identity_sha1(Eet_File *ef,
                  int *sha1_length);

/**
 * Display the x509 der certificate to out.
 *
 * @param certificate the x509 certificate to print
 * @param der_length The length the certificate.
 * @param out where to print.
 *
 * @warning You need to compile signature support in EET.
 * @since 1.2.0
 * @ingroup Eet_Cipher_Group
 */
EAPI void
eet_identity_certificate_print(const unsigned char *certificate,
                               int der_length,
                               FILE *out);

/**
 * @defgroup Eet_Data_Group Eet Data Serialization
 * @ingroup Eet
 *
 * Convenience functions to serialize and parse complex data
 * structures to binary blobs.
 *
 * While Eet core just handles binary blobs, it is often required
 * to save some structured data of different types, such as
 * strings, integers, lists, hashes and so on.
 *
 * Eet can serialize and then parse data types given some
 * construction instructions. These are defined in two levels:
 *
 * - #Eet_Data_Descriptor_Class to tell generic memory handling,
 *   such as the size of the type, how to allocate memory, strings,
 *   lists, hashes and so on.
 *
 * - #Eet_Data_Descriptor to tell inside such type, the members and
 *   their offsets inside the memory blob, their types and
 *   names. These members can be simple types or other
 *   #Eet_Data_Descriptor, allowing hierarchical types to be
 *   defined.
 *
 * Given that C provides no introspection, this process can be
 * quite cumbersome, so we provide lots of macros and convenience
 * functions to aid creating the types.
 *
 * We make now a quick overview of some of the most commonly used elements
 * of this part of the library. A simple example of a configuration system
 * will work as a somewhat real life example that is still simple enough to
 * follow.
 * Only the relevant sections will be shown here, but you can get the full
 * code @ref eet-data-simple.c "here".
 *
 * Ignoring the included headers, we'll begin by defining our configuration
 * struct.
 * @dontinclude eet-data-simple.c
 * @skip typedef
 * @until }
 *
 * When using Eet, you don't think in matters of what data the program needs
 * to run and which you would like to store. It's all the same and if it makes
 * more sense to keep them together, it's perfectly fine to do so. At the time
 * of telling Eet how your data is comprised you can leave out the things
 * that are runtime only and let Eet take care of the rest for you.
 *
 * The key used to store the config follows, as well as the variable used to
 * store our data descriptor.
 * This last one is very important. It's the one thing that Eet will use to
 * identify your data, both at the time of writing it to the file and when
 * loading from it.
 * @skipline MY_CONF
 * @skipline Eet_Data_Descriptor
 *
 * Now we'll see how to create this descriptor, so Eet knows how to handle
 * our data later on.
 * Begin our function by declaring an Eet_Data_Descriptor_Class, which is
 * used to create the actual descriptor. This class contains the name of
 * our data type, its size and several functions that dictate how Eet should
 * handle memory to allocate the necessary bits to bring our data to life.
 * You, as a user, will very hardly set this class' contents directly. The
 * most common scenario is to use one of the provided macros that set it using
 * the Eina data types, so that's what we'll be doing across all our examples.
 * @skip static void
 * @until eet_data_descriptor_stream_new
 *
 * Now that we have our descriptor, we need to make it describe something.
 * We do so by telling it which members of our struct we want it to know about
 * and their types.
 * The eet_data_descriptor_element_add() function takes care of this, but it's
 * too cumbersome for normal use, so several macros are provided that make
 * it easier to handle. Even with them, however, code can get very repetitive
 * and it's not uncommon to define custom macros using them to save on typing.
 * @skip #define
 * @until }
 *
 * Now our descriptor knows about the parts of our structure that we are
 * interesting in saving. You can see that not all of them are there, yet Eet
 * will find those that need saving and do the right thing. When loading our
 * data, any non-described fields in the structure will be zeroed, so there's
 * no need to worry about garbage memory in them.
 * Refer to the documentation of #EET_DATA_DESCRIPTOR_ADD_BASIC to understand
 * what our macro does.
 *
 * We are done with our descriptor init function and it's proper to have the
 * relevant shutdown. Proper coding guidelines indiciate that all memory
 * allocated should be freed when the program ends, and since you will most
 * likely keep your descriptor around for the life or your application, it's
 * only right to free it at the end.
 * @skip static void
 * @until }
 *
 * Not listed here, but included in the full example are functions to create
 * a blank configuration and free it. The first one will only be used when
 * no file exists to load from, or nothing is found in it, but the latter is
 * used regardless of where our data comes from. Unless you are reading direct
 * data from the Eet file, you will be in charge of freeing anything loaded
 * from it.
 *
 * Now it's time to look at how we can load our config from some file.
 * Begin by opening the Eet file normally.
 * @skip static My_Conf_Type
 * @until }
 *
 * And now we need to read the data from the file and decode it using our
 * descriptor. Fortunately, that's all done in one single step.
 * @until goto
 *
 * And that's it for all Eet cares about. But since we are dealing with a
 * common case, as is save and load of user configurations, the next fragment
 * of code shows why we have a version field in our struct, and how you can
 * use it to load older configuration files and update them as needed.
 * @until }
 *
 * Finally, close the file and return the newly loaded config data.
 * @until }
 *
 * Saving data is just as easy. The full version of the following function
 * includes code to save to a temporary file first, so you can be sure not
 * to lose all your data in the case of a failure mid-writing. You can look
 * at it @ref eet-data-simple.c "here".
 * @skip static Eina_Bool
 * @until {
 * @skipline Eina_Bool ret
 * @skip eet_open
 * @until eet_close
 * @skip return
 * @until }
 *
 * To close, our main function, which doesn't do much. Just take some arguments
 * from the command line with the name of the file to load and another one
 * where to save again. If input file doesn't exist, a new config structure
 * will be created and saved to our output file.
 * @skip int main
 * @until return ret
 * @until }
 *
 * The following is a list of more advanced and detailed examples.
 * @li @ref eet_data_nested_example
 * @li @ref eet_data_file_descriptor
 * @li @ref Example_Eet_Data_File_Descriptor_02
 * @li @ref Example_Eet_Data_Cipher_Decipher
 */

/**
 * @page eet_data_nested_example Nested structures and Eet Data Descriptors
 *
 * We've seen already a simple example of how to use Eet Data Descriptors
 * to handle our structures, but it didn't show how this works when you
 * have structures inside other structures.
 *
 * Now, there's a very simple case of this, for when you have inline structs
 * to keep your big structure more organized, you don't need anything else
 * besides what @ref eet-data-simple.c "this simple example does".
 * Just use something like @p some_struct.sub_struct.member when adding the
 * member to the descriptor and it will work.
 *
 * For example:
 * @code
 * typedef struct
 * {
 *    int a_number;
 *    char *a_string;
 *    struct {
 *       int other_num;
 *       int one_more;
 *    } sub;
 * } some_struct;
 *
 * void some_function()
 * {
 *    ...
 *    my_desc = eet_data_descriptor_stream_new(&eddc);
 *    EET_DATA_DESCRIPTOR_ADD_BASIC(my_desc, some_struct, "a_number",
 *                                  a_number, EET_T_INT);
 *    EET_DATA_DESCRIPTOR_ADD_BASIC(my_desc, some_struct, "a_string",
 *                                  a_string, EET_T_STRING);
 *    EET_DATA_DESCRIPTOR_ADD_BASIC(my_desc, some_struct, "sub.other_num",
 *                                  sub.other_num, EET_T_INT);
 *    EET_DATA_DESCRIPTOR_ADD_BASIC(my_desc, some_struct, "sub.one_more",
 *                                  sub.one_more", EET_T_INT);
 *    ...
 * }
 * @endcode
 *
 * But this is not what we are here for today. When we talk about nested
 * structures, what we really want are things like lists and hashes to be
 * taken into consideration automatically, and all their contents saved and
 * loaded just like ordinary integers and strings are.
 *
 * And of course, Eet can do that, and considering the work it saves you as a
 * programmer, we could say it's even easier to do than handling just integers.
 *
 * Let's begin with our example then, which is not all too different from the
 * simple one introduced earlier.
 *
 * We won't ignore the headers this time to show how easy it is to use Eina
 * data types with Eet, but we'll still skip most of the code that is not
 * pertinent to what we want to show now, but as usual, you can get it full
 * by following @ref eet-data-nested.c "this link".
 *
 * @dontinclude eet-data-nested.c
 * @skipline Eina.h
 * @skipline Eet.h
 * @skip typedef struct
 * @until } My_Conf_Subtype
 *
 * Extremely similar to our previous example. Just a new struct in there, and
 * a pointer to a list in the one we already had. Handling a list of subtypes
 * is easy on our program, but now we'll see what Eet needs to work with them
 * (Hint: it's easy too).
 * @skip _my_conf_descriptor
 * @until _my_conf_sub_descriptor
 *
 * Since we have two structures now, it's only natural that we'll need two
 * descriptors. One for each, which will be defined exactly as before.
 * @skip static void
 * @until eddc
 * @skip EET_EINA_STREAM_DATA_DESCRIPTOR_CLASS_SET
 * @until _my_conf_sub_descriptor
 *
 * We create our descriptors, each for one type, and as before, we are going to
 * use a simple macro to set their contents, to save on typing.
 * @skip #define
 * @until EET_T_UCHAR
 *
 * So far, nothing new. We have our descriptors and we know already how to
 * save them separately. But what we want is to link them together, and even
 * more so, we want our main type to hold a list of more than one of the new
 * sub type. So how do we do that?
 *
 * Simple enough, we tell Eet that our main descriptor will hold a list, of
 * which each node will point to some type described by our new descriptor.
 * @skip EET_DATA_DESCRIPTOR_ADD_LIST
 * @until _my_conf_sub_descriptor
 *
 * And that's all. We are closing the function now so as to not leave dangling
 * curly braces, but there's nothing more to show in this example. Only other
 * additions are the necessary code to free our new data, but you can see it
 * in the full code listing.
 * @until }
 */

/**
 * @page eet_data_file_descriptor Advanced use of Eet Data Descriptors
 *
 * A real life example is usually the best way to see how things are used,
 * but they also involve a lot more code than what needs to be shown, so
 * instead of going that way, we'll be borrowing some pieces from one in
 * the following example. It's been slightly modified from the original
 * source to show more of the varied ways in which Eet can handle our data.
 *
 * @ref eet-data-file_descriptor_01.c "This example" shows a cache of user
 * accounts and messages received, and it's a bit more interactive than
 * previous examples.
 *
 * Let's begin by looking at the structures we'll be using. First we have
 * one to define the messages the user receives and one for the one he posts.
 * Straight forward and nothing new here.
 * @dontinclude eet-data-file_descriptor_01.c
 * @skip typedef
 * @until My_Post
 *
 * One more to declare the account itself. This one will contain a list of
 * all messages received, and the posts we make ourselves will be kept in an
 * array. No special reason other than to show how to use arrays with Eet.
 * @until My_Account
 *
 * Finally, the main structure to hold our cache of accounts. We'll be looking
 * for these accounts by their names, so let's keep them in a hash, using
 * that name as the key.
 * @until My_Cache
 *
 * As explained before, we need one descriptor for each struct we want Eet
 * to handle, but this time we also want to keep around our Eet file and its
 * string dictionary. You will see why in a moment.
 * @skip Eet_Data_Descriptor
 * @until _my_post_descriptor
 * @skip Eet_File
 * @until Eet_Dictionary
 *
 * The differences begin now. They aren't much, but we'll be creating our
 * descriptors differently. Things can be added to our cache, but we won't
 * be modifying the current contents, so we can consider the data read from
 * it to be read-only, and thus allow Eet to save time and memory by not
 * duplicating thins unnecessary.
 * @skip static void
 * @until _my_post_descriptor
 *
 * As the comment in the code explains, we are asking Eet to give us strings
 * directly from the mapped file, which avoids having to load it in memory
 * and data duplication.
 * Of course, there are things to take into account when doing things this
 * way, and they will be mentioned as we encounter those special cases.
 *
 * Next comes the actual description of our data, just like we did in the
 * previous examples.
 * @skip #define
 * @until #undef
 * @until #define
 * @until #undef
 *
 * And the account struct's description doesn't add much new, but it's worth
 * commenting on it.
 * @skip #define
 * @until _my_post_descriptor
 *
 * How to add a list we've seen before, but now we are also adding an array.
 * There's nothing really special about it, but it's important to note that
 * the EET_DATA_DESCRIPTOR_ADD_VAR_ARRAY is used to add arrays of variable
 * length to a descriptor. That is, arrays just like the one we defined.
 * Since there's no way in C to know how long they are, we need to keep
 * track of the count ourselves and Eet needs to know how to do so as well.
 * That's what the @p posts_count member of our struct is for. When adding
 * our array member, this macro will look for another variable in the struct
 * named just like the array, but with @p _count attached to the end.
 * When saving our data, Eet will know how many elements the array contains
 * by looking into this count variable. When loading back from a file, this
 * variable will be set to the right number of elements.
 *
 * Another option for arrays is to use EET_DATA_DESCRIPTOR_ADD_ARRAY, which
 * takes care of fixed sized arrays.
 * For example, let's suppose that we want to keep track of only the last
 * ten posts the user sent, and we declare our account struct as follows
 * @code
 * typedef struct
 * {
 *    unsigned int id;
 *    const char  *name;
 *    Eina_List   *messages;
 *    My_Post      posts[10];
 * } My_Account;
 * @endcode
 * Then we would add the array to our descriptor with
 * @code
 * EET_DATA_DESCRIPTOR_ADD_ARRAY(_my_account_descriptor, My_Account, "posts",
 *                               posts, _my_post_descriptor);
 * @endcode
 *
 * Notice how this time we don't have a @p posts_count variable in our struct.
 * We could have it for the program to keep track of how many posts the
 * array actually contains, but Eet no longer needs it. Being defined that
 * way the array is already taking up all the memory needed for the ten
 * elements, and it is possible in C to determine how much it is in code.
 * When saving our data, Eet will just dump the entire memory blob into the
 * file, regardless of how much of it is really used. So it's important to
 * take into consideration this kind of things when defining your data types.
 * Each has its uses, its advantages and disadvantages and it's up to you
 * to decide which to use.
 *
 * Now, going back to our example, we have to finish adding our data to the
 * descriptors. We are only missing the main one for the cache, which
 * contains our hash of accounts.
 * Unless you are using your own hash functions when setting the descriptor
 * class, always use hashes with string type keys.
 * @skip #define
 * @until }
 *
 * If you remember, we told Eet not to duplicate memory when possible at the
 * time of loading back our data. But this doesn't mean everything will be
 * loaded straight from disk and we don't have to worry about freeing it.
 * Data in the Eet file is compressed and encoded, so it still needs to be
 * decoded and memory will be allocated to convert it back into something we
 * can use. We also need to take care of anything we add in the current
 * instance of the program.
 * To summarize, any string we get from Eet is likely to be a pointer to the
 * internal dictionary, and trying to free it will, in the best case, crash
 * our application right away.
 *
 * So how do we know if we have to free a string? We check if it's part of
 * the dictionary, and if it's not there we can be sure it's safe to get
 * rid of it.
 * @skip static void
 * @skip }
 * @skip static void
 * @until }
 *
 * See how this is used when adding a new message to our cache.
 * @skip static My_Message
 * @until return msg
 * @until free(msg)
 * @until }
 *
 * Skipping all the utility functions used by our program (remember you can
 * look at the full example @ref eet-data-file_descriptor_01.c "here") we get to
 * our cache loading code. Nothing out of the ordinary at first, just the
 * same old open file, read data using our main descriptor to decode it
 * into something we can use and check version of loaded data and if it doesn't
 * match, do something accordingly.
 * @skip static My_Cache
 * @until }
 * @until }
 * @until }
 *
 * Then comes the interesting part. Remember how we kept two more global
 * variables with our descriptors? One of them we already used to check if
 * it was right to free a string or not, but we didn't know where it came from.
 * Loading our data straight from the mmapped file means that we can't close
 * it until we are done using it, so we need to keep its handler around until
 * then. It also means that any changes done to the file can, and will,
 * invalidate all our pointers to the file backed data, so if we add something
 * and save the file, we need to reload our cache.
 *
 * Thus our load function checks if we had an open file, if there is it gets
 * closed and our variable is updated to the new handler. Then we get the
 * string dictionary we use to check if a string is part of it or not.
 * Updating any references to the cache data is up you as a programmer to
 * handle properly, there's nothing Eet can do in this situation.
 * @until }
 *
 * The save function doesn't have anything new, and all that's left after it
 * is the main program, which doesn't really have anything of interest within
 * the scope of what we are learning.
 */

/**
 * @addtogroup Eet_Data_Group
 * @{
 */
#define EET_T_UNKNOW         0 /**< Unknown data encoding type */
#define EET_T_CHAR           1 /**< Data type: char */
#define EET_T_SHORT          2 /**< Data type: short */
#define EET_T_INT            3 /**< Data type: int */
#define EET_T_LONG_LONG      4 /**< Data type: long long */
#define EET_T_FLOAT          5 /**< Data type: float */
#define EET_T_DOUBLE         6 /**< Data type: double */
#define EET_T_UCHAR          7 /**< Data type: unsigned char */
#define EET_T_USHORT         8 /**< Data type: unsigned short */
#define EET_T_UINT           9 /**< Data type: unsigned int */
#define EET_T_ULONG_LONG     10 /**< Data type: unsigned long long */
#define EET_T_STRING         11 /**< Data type: char * */
#define EET_T_INLINED_STRING 12 /**< Data type: char * (but compressed inside the resulting eet) */
#define EET_T_NULL           13 /**< Data type: (void *) (only use it if you know why) */
#define EET_T_F32P32         14 /**< Data type: fixed point 32.32 */
#define EET_T_F16P16         15 /**< Data type: fixed point 16.16 */
#define EET_T_F8P24          16 /**< Data type: fixed point 8.24 */
#define EET_T_VALUE          17 /**< Data type: pointer to Eina_Value @since 1.8 */
#define EET_T_LAST           18 /**< Last data type */

#define EET_G_UNKNOWN        100 /**< Unknown group data encoding type */
#define EET_G_ARRAY          101 /**< Fixed size array group type */
#define EET_G_VAR_ARRAY      102 /**< Variable size array group type */
#define EET_G_LIST           103 /**< Linked list group type */
#define EET_G_HASH           104 /**< Hash table group type */
#define EET_G_UNION          105 /**< Union group type */
#define EET_G_VARIANT        106 /**< Selectable subtype group */
#define EET_G_UNKNOWN_NESTED 107 /**< Unknown nested group type. @since 1.8 */
#define EET_G_LAST           108 /**< Last group type */

#define EET_I_LIMIT          128 /**< Other type exist but are reserved for internal purpose. */

/**
 * @typedef Eet_Data_Descriptor
 *
 * Opaque handle that have information on a type members.
 *
 * Descriptors are created using an #Eet_Data_Descriptor_Class, and they
 * describe the contents of the structure that will be serialized by Eet.
 * Not all members need be described by it, just those that should be handled
 * by Eet. This way it's possible to have one structure with both data to be
 * saved to a file, like application configuration, and runtime information
 * that would be meaningless to store, but is appropriate to keep together
 * during the program execution.
 * The members are added by means of
 * EET_DATA_DESCRIPTOR_ADD_BASIC(), EET_DATA_DESCRIPTOR_ADD_SUB(),
 * EET_DATA_DESCRIPTOR_ADD_LIST(), EET_DATA_DESCRIPTOR_ADD_HASH()
 * or eet_data_descriptor_element_add().
 *
 * @see eet_data_descriptor_stream_new()
 * @see eet_data_descriptor_file_new()
 * @see eet_data_descriptor_free()
 */
typedef struct _Eet_Data_Descriptor Eet_Data_Descriptor;

/**
 * @def EET_DATA_DESCRIPTOR_CLASS_VERSION
 * The version of #Eet_Data_Descriptor_Class at the time of the
 * distribution of the sources. One should define this to its
 * version member so it is compatible with abi changes, or at least
 * will not crash with them.
 */
#define EET_DATA_DESCRIPTOR_CLASS_VERSION 4

/**
 * @typedef Eet_Data_Descriptor_Class
 *
 * Instructs Eet about memory management for different needs under
 * serialization and parse process.
 */
typedef struct _Eet_Data_Descriptor_Class Eet_Data_Descriptor_Class;

/**
 * @typedef (*Eet_Descriptor_Hash_Foreach_Callback_Callback)
 *
 * Callback prototype for Eet_Descriptor_Hash_Foreach_Callback
 * @param h the hash
 * @param k the key
 * @param dt the data
 * @param fdt the data passed to the callback
 * @return an integer
 */
typedef int                             (*Eet_Descriptor_Hash_Foreach_Callback_Callback)(void *h, const char *k, void *dt, void *fdt);

/**
 * @typedef (*Eet_Descriptor_Mem_Alloc_Callback)
 *
 * Callback prototype for Eet_Descriptor_Mem_Alloc
 * @param size is the size of memory to alloc on call of the callback
 */
typedef void *                          (*Eet_Descriptor_Mem_Alloc_Callback)(size_t size);

/**
 * @typedef (*Eet_Descriptor_Mem_Free_Callback)
 *
 * Callback prototype for Eet_Descriptor_Mem_Alloc
 * @param mem must be a pointer to free on call of the callback
 */
typedef void                            (*Eet_Descriptor_Mem_Free_Callback)(void *mem);

/**
 * @typedef (*Eet_Descriptor_Str_Alloc_Callback)
 *
 * Callback prototype for Eet_Descriptor_Str_Alloc
 * @param str must be the string to alloc
 * @return have must be an allocated char * for the given string
 */
typedef char *                          (*Eet_Descriptor_Str_Alloc_Callback)(const char *str);

/**
 * @typedef (*Eet_Descriptor_Str_Free_Callback)
 *
 * Callback prototype for Eet_Descriptor_Str_Free
 * @param str must be an allocated string to free
 */
typedef void                            (*Eet_Descriptor_Str_Free_Callback)(const char *str);

/**
 * @typedef (*Eet_Descriptor_List_Next_Callback)
 *
 * Callback prototype for Eet_Descriptor_List_Next
 * @param l must be a pointer to the list
 * @return must be a pointer to the list
 */
typedef void *                          (*Eet_Descriptor_List_Next_Callback)(void *l);

/**
 * @typedef (*Eet_Descriptor_List_Append_Callback)
 *
 * Callback prototype for Eet_Descriptor_List_Append
 * @param l must be a pointer to the list
 * @param d the data to append to the list
 * @return must be a pointer to the list
 */
typedef void *                          (*Eet_Descriptor_List_Append_Callback)(void *l, void *d);


/**
 * @typedef (*Eet_Descriptor_List_Data_Callback)
 *
 * Callback prototype for Eet_Descriptor_List_Data
 * @param l must be a pointer to the list
 * @return must be a pointer to the list
 */
typedef void *                          (*Eet_Descriptor_List_Data_Callback)(void *l);

/**
 * @typedef (*Eet_Descriptor_List_Free_Callback)
 *
 * Callback prototype for Eet_Descriptor_List_Free
 * @param l must be a pointer to the list to free
 */
typedef void *                          (*Eet_Descriptor_List_Free_Callback)(void *l);

/**
 * @typedef (*Eet_Descriptor_Hash_Foreach_Callback)
 *
 * Callback for Eet_Descriptor_Hash_Foreach
 * @param h the hash
 * @param func the function callback to call on each iteration
 * @param fdt the data to pass to the callbac setted in param func
 */
typedef void                            (*Eet_Descriptor_Hash_Foreach_Callback)(void *h, Eet_Descriptor_Hash_Foreach_Callback_Callback func, void *fdt);

/**
 * @typedef (*Eet_Descriptor_Hash_Add_Callback)
 *
 * Callback prototype for Eet_Descriptor_Hash_Add
 * @param h the hash
 * @param k the key
 * @param d the data to associate with the 'k' key
 */
typedef void *                          (*Eet_Descriptor_Hash_Add_Callback)(void *h, const char *k, void *d);

/**
 * @typedef (*Eet_Descriptor_Hash_Free_Callback)
 *
 * Callback prototype for Eet_Descriptor_Hash_Free
 * @param h the hash to free
 */
typedef void                            (*Eet_Descriptor_Hash_Free_Callback)(void *h);

/**
 * @typedef (*Eet_Descriptor_Str_Alloc_Callback)
 *
 * Callback prototype for Eet_Descriptor_Str_Alloc
 * @param str the string to allocate
 * @return an allocated pointer to the string
 */
typedef char *                          (*Eet_Descriptor_Str_Direct_Alloc_Callback)(const char *str);

/**
 * @typedef (*Eet_Descriptor_Str_Free_Callback)
 *
 * Callback prototype for Eet_Descriptor_Str_Free
 * @param str the string to free
 */
typedef void                            (*Eet_Descriptor_Str_Direct_Free_Callback)(const char *str);


/**
 * @typedef (*Eet_Descriptor_Type_Get_Callback)
 *
 * Callback prototype for Eet_Descriptor_Type_Get
 * @param data data to pass to the callback
 * @param unknow Eina_Bool __FIXME__
 */
typedef const char *                    (*Eet_Descriptor_Type_Get_Callback)(const void *data, Eina_Bool *unknow);

/**
 * @typedef (*Eet_Descriptor_Type_Set_Callback)
 *
 * Callback prototype for Eet_Descriptor_Type_Set
 * @param type the type to set
 * @param data to pass to the callback
 * @param unknow Eina_Bool __FIXME__
 */
typedef Eina_Bool                       (*Eet_Descriptor_Type_Set_Callback)(const char *type, void *data, Eina_Bool unknow);


/**
 * @typedef (*Eet_Descriptor_Array_Alloc_Callback)
 *
 * Callback prototype for Eet_Descriptor_Array_Alloc
 * @param size The size of the array
 */
typedef void *                          (*Eet_Descriptor_Array_Alloc_Callback)(size_t size);

/**
 * @typedef (*Eet_Descriptor_Array_Free_Callback)
 *
 * Callback prototype for Eet_Descriptor_Array_Free
 * @param size The size of the array
 */
typedef void                            (*Eet_Descriptor_Array_Free_Callback)(void *mem);
/**
 * @struct _Eet_Data_Descriptor_Class
 *
 * Instructs Eet about memory management for different needs under
 * serialization and parse process.
 *
 * The list and hash methods match the Eina API, so for a more detailed
 * reference on them, look at the Eina_List and Eina_Hash documentation,
 * respectively.
 * For the most part these will be used with the standard Eina functions,
 * so using EET_EINA_STREAM_DATA_DESCRIPTOR_CLASS_SET() and
 * EET_EINA_FILE_DATA_DESCRIPTOR_CLASS_SET() will set up everything
 * accordingly.
 */
struct _Eet_Data_Descriptor_Class
{
   int         version;  /**< ABI version. Should always be set to #EET_DATA_DESCRIPTOR_CLASS_VERSION */
   const char *name;  /**< Name of the user data type to be serialized */
   int         size;  /**< Size in bytes of the user data type to be serialized */
   struct
   {
      Eet_Descriptor_Mem_Alloc_Callback        mem_alloc; /**< how to allocate memory (usually malloc()) */
      Eet_Descriptor_Mem_Free_Callback         mem_free; /**< how to free memory (usually free()) */
      Eet_Descriptor_Str_Alloc_Callback        str_alloc; /**< how to allocate a string */
      Eet_Descriptor_Str_Free_Callback         str_free; /**< how to free a string */
      Eet_Descriptor_List_Next_Callback        list_next; /**< how to iterate to the next element of a list. Receives and should return the list node. */
      Eet_Descriptor_List_Append_Callback      list_append; /**< how to append data @p d to list which head node is @p l */
      Eet_Descriptor_List_Data_Callback        list_data; /**< retrieves the data from node @p l */
      Eet_Descriptor_List_Free_Callback        list_free; /**< free all the nodes from the list which head node is @p l */
      Eet_Descriptor_Hash_Foreach_Callback     hash_foreach; /**< iterates over all elements in the hash @p h in no specific order */
      Eet_Descriptor_Hash_Add_Callback         hash_add; /**< add a new data @p d with key @p k in hash @p h */
      Eet_Descriptor_Hash_Free_Callback        hash_free; /**< free all entries from the hash @p h */
      Eet_Descriptor_Str_Direct_Alloc_Callback str_direct_alloc; /**< how to allocate a string directly from file backed/mmaped region pointed by @p str */
      Eet_Descriptor_Str_Direct_Free_Callback  str_direct_free; /**< how to free a string returned by str_direct_alloc */
      Eet_Descriptor_Type_Get_Callback         type_get; /**< get the type, as used in the union or variant mapping, that should be used to store the given data into the eet file. */
      Eet_Descriptor_Type_Set_Callback         type_set; /**< called when loading a mapped type with the given @p type used to describe the type in the descriptor */
      Eet_Descriptor_Array_Alloc_Callback      array_alloc; /**< how to allocate memory for array (usually malloc()) */
      Eet_Descriptor_Array_Free_Callback       array_free; /**< how to free memory for array (usually free()) */
   } func;
};

/**
 * @}
 */

/**
 * Create a new empty data structure descriptor.
 * @param name The string name of this data structure (most be a
 *        global constant and never change).
 * @param size The size of the struct (in bytes).
 * @param func_list_next The function to get the next list node.
 * @param func_list_append The function to append a member to a list.
 * @param func_list_data The function to get the data from a list node.
 * @param func_list_free The function to free an entire linked list.
 * @param func_hash_foreach The function to iterate through all
 *        hash table entries.
 * @param func_hash_add The function to add a member to a hash table.
 * @param func_hash_free The function to free an entire hash table.
 * @return A new empty data descriptor.
 *
 * This function creates a new data descriptor and returns a handle to the
 * new data descriptor. On creation it will be empty, containing no contents
 * describing anything other than the shell of the data structure.
 *
 * You add structure members to the data descriptor using the macros
 * EET_DATA_DESCRIPTOR_ADD_BASIC(), EET_DATA_DESCRIPTOR_ADD_SUB() and
 * EET_DATA_DESCRIPTOR_ADD_LIST(), depending on what type of member you are
 * adding to the description.
 *
 * Once you have described all the members of a struct you want loaded, or
 * saved eet can load and save those members for you, encode them into
 * endian-independent serialised data chunks for transmission across a
 * a network or more.
 *
 * The function pointers to the list and hash table functions are only
 * needed if you use those data types, else you can pass NULL instead.
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 *
 * @deprecated use eet_data_descriptor_stream_new() or
 *             eet_data_descriptor_file_new()
 */
EINA_DEPRECATED EAPI Eet_Data_Descriptor *
eet_data_descriptor_new(const char *name,
                        int size,
                        Eet_Descriptor_List_Next_Callback func_list_next,
                        Eet_Descriptor_List_Append_Callback func_list_append,
                        Eet_Descriptor_List_Data_Callback func_list_data,
                        Eet_Descriptor_List_Free_Callback func_list_free,
                        Eet_Descriptor_Hash_Foreach_Callback func_hash_foreach,
                        Eet_Descriptor_Hash_Add_Callback func_hash_add,
                        Eet_Descriptor_Hash_Free_Callback func_hash_free);
/*
 * FIXME:
 *
 * moving to this api from the old above. this will break things when the
 * move happens - but be warned
 */
EINA_DEPRECATED EAPI Eet_Data_Descriptor *
 eet_data_descriptor2_new(const Eet_Data_Descriptor_Class *eddc);
EINA_DEPRECATED EAPI Eet_Data_Descriptor *
 eet_data_descriptor3_new(const Eet_Data_Descriptor_Class *eddc);

/**
 * This function creates a new data descriptor and returns a handle to the
 * new data descriptor. On creation it will be empty, containing no contents
 * describing anything other than the shell of the data structure.
 * @param eddc The class from where to create the data descriptor.
 * @return A handle to the new data descriptor.
 *
 * You add structure members to the data descriptor using the macros
 * EET_DATA_DESCRIPTOR_ADD_BASIC(), EET_DATA_DESCRIPTOR_ADD_SUB() and
 * EET_DATA_DESCRIPTOR_ADD_LIST(), depending on what type of member you are
 * adding to the description.
 *
 * Once you have described all the members of a struct you want loaded or
 * saved, eet can load and save those members for you, encode them into
 * endian-independent serialised data chunks for transmission across a
 * network or more.
 *
 * This function specially ignores str_direct_alloc and str_direct_free. It
 * is useful when the eet_data you are reading doesn't have a dictionary,
 * like network stream or IPC. It also mean that all string will be allocated
 * and duplicated in memory.
 *
 * @since 1.2.3
 * @ingroup Eet_Data_Group
 */
EAPI Eet_Data_Descriptor *
eet_data_descriptor_stream_new(const Eet_Data_Descriptor_Class *eddc);

/**
 * This function creates a new data descriptor and returns a handle to the
 * new data descriptor. On creation it will be empty, containing no contents
 * describing anything other than the shell of the data structure.
 * @param eddc The class from where to create the data descriptor.
 * @return A handle to the new data descriptor.
 *
 * You add structure members to the data descriptor using the macros
 * EET_DATA_DESCRIPTOR_ADD_BASIC(), EET_DATA_DESCRIPTOR_ADD_SUB() and
 * EET_DATA_DESCRIPTOR_ADD_LIST(), depending on what type of member you are
 * adding to the description.
 *
 * Once you have described all the members of a struct you want loaded or
 * saved, eet can load and save those members for you, encode them into
 * endian-independent serialised data chunks for transmission across a
 * a network or more.
 *
 * This function uses str_direct_alloc and str_direct_free. It is
 * useful when the eet_data you are reading come from a file and
 * have a dictionary. This will reduce memory use and improve the
 * possibility for the OS to page this string out.
 * However, the load speed and memory saving comes with some drawbacks to keep
 * in mind. If you never modify the contents of the structures loaded from
 * the file, all you need to remember is that closing the eet file will make
 * the strings go away. On the other hand, should you need to free a string,
 * before doing so you have to verify that it's not part of the eet dictionary.
 * You can do this in the following way, assuming @p ef is a valid Eet_File
 * and @p str is a string loaded from said file.
 *
 * @code
 * void eet_string_free(Eet_File *ef, const char *str)
 * {
 *    Eet_Dictionary *dict = eet_dictionary_get(ef);
 *    if (dict && eet_dictionary_string_check(dict, str))
 *      {
 *         // The file contains a dictionary and the given string is a part of
 *         // of it, so we can't free it, just return.
 *         return;
 *      }
 *    // We assume eina_stringshare was used on the descriptor
 *    eina_stringshare_del(str);
 * }
 * @endcode
 *
 * @since 1.2.3
 * @ingroup Eet_Data_Group
 */
EAPI Eet_Data_Descriptor *
eet_data_descriptor_file_new(const Eet_Data_Descriptor_Class *eddc);

/**
 * This function is an helper that set all the parameters of an
 * Eet_Data_Descriptor_Class correctly when you use Eina data type
 * with a stream.
 * @param eddc The Eet_Data_Descriptor_Class you want to set.
 * @param eddc_size The size of the Eet_Data_Descriptor_Class at the compilation time.
 * @param name The name of the structure described by this class.
 * @param size The size of the structure described by this class.
 * @return EINA_TRUE if the structure was correctly set (The only
 *         reason that could make it fail is if you did give wrong
 *         parameter).
 *
 * @note Unless there's a very specific reason to use this function directly,
 * the EET_EINA_STREAM_DATA_DESCRIPTOR_CLASS_SET macro is recommended.
 *
 * @since 1.2.3
 * @ingroup Eet_Data_Group
 */
EAPI Eina_Bool
eet_eina_stream_data_descriptor_class_set(Eet_Data_Descriptor_Class *eddc,
                                          unsigned int eddc_size,
                                          const char *name,
                                          int size);

/**
 * This macro is an helper that set all the parameter of an
 * Eet_Data_Descriptor_Class correctly when you use Eina data type
 * with stream.
 * @param clas The Eet_Data_Descriptor_Class you want to set.
 * @param type The type of the structure described by this class.
 * @return EINA_TRUE if the structure was correctly set (The only
 *         reason that could make it fail is if you did give wrong
 *         parameter).
 *
 * @see eet_data_descriptor_stream_new
 * @since 1.2.3
 * @ingroup Eet_Data_Group
 */
#define EET_EINA_STREAM_DATA_DESCRIPTOR_CLASS_SET(clas, type) \
  (eet_eina_stream_data_descriptor_class_set(clas, sizeof (*(clas)), # type, sizeof(type)))

/**
 * This function is an helper that set all the parameter of an
 * Eet_Data_Descriptor_Class correctly when you use Eina data type
 * with a file.
 * @param eddc The Eet_Data_Descriptor_Class you want to set.
 * @param eddc_size The size of the Eet_Data_Descriptor_Class at the compilation time.
 * @param name The name of the structure described by this class.
 * @param size The size of the structure described by this class.
 * @return EINA_TRUE if the structure was correctly set (The only
 *         reason that could make it fail is if you did give wrong
 *         parameter).
 *
 * @note Unless there's a very specific reason to use this function directly,
 * the EET_EINA_FILE_DATA_DESCRIPTOR_CLASS_SET macro is recommended.
 *
 * @since 1.2.3
 * @ingroup Eet_Data_Group
 */
EAPI Eina_Bool
eet_eina_file_data_descriptor_class_set(Eet_Data_Descriptor_Class *eddc,
                                        unsigned int eddc_size,
                                        const char *name,
                                        int size);

/**
 * This macro is an helper that set all the parameter of an
 * Eet_Data_Descriptor_Class correctly when you use Eina data type
 * with file.
 * @param clas The Eet_Data_Descriptor_Class you want to set.
 * @param type The type of the structure described by this class.
 * @return EINA_TRUE if the structure was correctly set (The only
 *         reason that could make it fail is if you did give wrong
 *         parameter).
 *
 * @see eet_data_descriptor_file_new
 * @since 1.2.3
 * @ingroup Eet_Data_Group
 */
#define EET_EINA_FILE_DATA_DESCRIPTOR_CLASS_SET(clas, type) \
  (eet_eina_file_data_descriptor_class_set(clas, sizeof (*(clas)), # type, sizeof(type)))

/**
 * This function frees a data descriptor when it is not needed anymore.
 * @param edd The data descriptor to free.
 *
 * This function takes a data descriptor handle as a parameter and frees all
 * data allocated for the data descriptor and the handle itself. After this
 * call the descriptor is no longer valid.
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI void
eet_data_descriptor_free(Eet_Data_Descriptor *edd);

/**
 * This function returns the name of a data descriptor.
 *
 * @since 1.8.0
 * @ingroup Eet_Data_Group
 */
EAPI const char *eet_data_descriptor_name_get(const Eet_Data_Descriptor *edd);

/**
 * This function is an internal used by macros.
 *
 * This function is used by macros EET_DATA_DESCRIPTOR_ADD_BASIC(),
 * EET_DATA_DESCRIPTOR_ADD_SUB() and EET_DATA_DESCRIPTOR_ADD_LIST(). It is
 * complex to use by hand and should be left to be used by the macros, and
 * thus is not documented.
 *
 * @param edd The data descriptor handle to add element (member).
 * @param name The name of element to be serialized.
 * @param type The type of element to be serialized, like
 *        #EET_T_INT. If #EET_T_UNKNOW, then it is considered to be a
 *        group, list or hash.
 * @param group_type If element type is #EET_T_UNKNOW, then the @p
 *        group_type will specify if it is a list (#EET_G_LIST),
 *        array (#EET_G_ARRAY) and so on. If #EET_G_UNKNOWN, then
 *        the member is a subtype (pointer to another type defined by
 *        another #Eet_Data_Descriptor).
 * @param offset byte offset inside the source memory to be serialized.
 * @param count number of elements (if #EET_G_ARRAY or #EET_G_VAR_ARRAY).
 * @param counter_name variable that defines the name of number of elements.
 * @param subtype If contains a subtype, then its data descriptor.
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI void
eet_data_descriptor_element_add(Eet_Data_Descriptor *edd,
                                const char *name,
                                int type,
                                int group_type,
                                int offset,
     /* int                  count_offset, */
                                int count,
                                const char *counter_name,
                                Eet_Data_Descriptor *subtype);

/**
 * Read a data structure from an eet file and decodes it.
 * @param ef The eet file handle to read from.
 * @param edd The data descriptor handle to use when decoding.
 * @param name The key the data is stored under in the eet file.
 * @return A pointer to the decoded data structure.
 *
 * This function decodes a data structure stored in an eet file, returning
 * a pointer to it if it decoded successfully, or NULL on failure. This
 * can save a programmer dozens of hours of work in writing configuration
 * file parsing and writing code, as eet does all that work for the program
 * and presents a program-friendly data structure, just as the programmer
 * likes. Eet can handle members being added or deleted from the data in
 * storage and safely zero-fills unfilled members if they were not found
 * in the data. It checks sizes and headers whenever it reads data, allowing
 * the programmer to not worry about corrupt data.
 *
 * Once a data structure has been described by the programmer with the
 * fields they wish to save or load, storing or retrieving a data structure
 * from an eet file, or from a chunk of memory is as simple as a single
 * function call.
 *
 * @see eet_data_read_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI void *
eet_data_read(Eet_File *ef,
              Eet_Data_Descriptor *edd,
              const char *name);

/**
 * Write a data structure from memory and store in an eet file.
 * @param ef The eet file handle to write to.
 * @param edd The data descriptor to use when encoding.
 * @param name The key to store the data under in the eet file.
 * @param data A pointer to the data structure to save and encode.
 * @param compress Compression flags for storage.
 * @return bytes written on successful write, 0 on failure.
 *
 * This function is the reverse of eet_data_read(), saving a data structure
 * to an eet file. The file must have been opening in write mode and the data
 * will be kept in memory until the file is either closed or eet_sync() is
 * called to flush any unwritten changes.
 *
 * @see eet_data_write_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI int
eet_data_write(Eet_File *ef,
               Eet_Data_Descriptor *edd,
               const char *name,
               const void *data,
               int compress);

/**
 *  @typedef Eet_Data_Descriptor_Class
 * 
 * Callback protoype for Eet_Dump 
 *
 * @param data to passe to the callback
 * @param str the string to dump 
 *
 */
typedef void (*Eet_Dump_Callback)(void *data, const char *str);

/**
 * Dump an eet encoded data structure into ascii text
 * @param data_in The pointer to the data to decode into a struct.
 * @param size_in The size of the data pointed to in bytes.
 * @param dumpfunc The function to call passed a string when new
 *        data is converted to text
 * @param dumpdata The data to pass to the @p dumpfunc callback.
 * @return 1 on success, 0 on failure
 *
 * This function will take a chunk of data encoded by
 * eet_data_descriptor_encode() and convert it into human readable
 * ascii text.  It does this by calling the @p dumpfunc callback
 * for all new text that is generated. This callback should append
 * to any existing text buffer and will be passed the pointer @p
 * dumpdata as a parameter as well as a string with new text to be
 * appended.
 *
 * Example:
 *
 * @code
 * void output(void *data, const char *string)
 * {
 *   printf("%s", string);
 * }
 *
 * void dump(const char *file)
 * {
 *   FILE *f;
 *   int len;
 *   void *data;
 *
 *   f = fopen(file, "r");
 *   fseek(f, 0, SEEK_END);
 *   len = ftell(f);
 *   rewind(f);
 *   data = malloc(len);
 *   fread(data, len, 1, f);
 *   fclose(f);
 *   eet_data_text_dump(data, len, output, NULL);
 * }
 * @endcode
 *
 * @see eet_data_text_dump_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI int
eet_data_text_dump(const void *data_in,
                   int size_in,
                   Eet_Dump_Callback dumpfunc,
                   void *dumpdata);

/**
 * Take an ascii encoding from eet_data_text_dump() and re-encode in binary.
 * @param text The pointer to the string data to parse and encode.
 * @param textlen The size of the string in bytes (not including 0
 *        byte terminator).
 * @param size_ret This gets filled in with the encoded data blob
 *        size in bytes.
 * @return The encoded data on success, NULL on failure.
 *
 * This function will parse the string pointed to by @p text and return
 * an encoded data lump the same way eet_data_descriptor_encode() takes an
 * in-memory data struct and encodes into a binary blob. @p text is a normal
 * C string.
 *
 * @see eet_data_text_undump_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI void *
eet_data_text_undump(const char *text,
                     int textlen,
                     int *size_ret);

/**
 * Dump an eet encoded data structure from an eet file into ascii text
 * @param ef A valid eet file handle.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param dumpfunc The function to call passed a string when new
 *        data is converted to text
 * @param dumpdata The data to pass to the @p dumpfunc callback.
 * @return 1 on success, 0 on failure
 *
 * This function will take an open and valid eet file from
 * eet_open() request the data encoded by
 * eet_data_descriptor_encode() corresponding to the key @p name
 * and convert it into human readable ascii text. It does this by
 * calling the @p dumpfunc callback for all new text that is
 * generated. This callback should append to any existing text
 * buffer and will be passed the pointer @p dumpdata as a parameter
 * as well as a string with new text to be appended.
 *
 * @see eet_data_dump_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI int
eet_data_dump(Eet_File *ef,
              const char *name,
              Eet_Dump_Callback dumpfunc,
              void *dumpdata);

/**
 * Take an ascii encoding from eet_data_dump() and re-encode in binary.
 * @param ef A valid eet file handle.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param text The pointer to the string data to parse and encode.
 * @param textlen The size of the string in bytes (not including 0
 *        byte terminator).
 * @param compress Compression flags (1 == compress, 0 = don't compress).
 * @return 1 on success, 0 on failure
 *
 * This function will parse the string pointed to by @p text,
 * encode it the same way eet_data_descriptor_encode() takes an
 * in-memory data struct and encodes into a binary blob.
 *
 * The data (optionally compressed) will be in ram, pending a flush to
 * disk (it will stay in ram till the eet file handle is closed though).
 *
 * @see eet_data_undump_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI int
eet_data_undump(Eet_File *ef,
                const char *name,
                const char *text,
                int textlen,
                int compress);

/**
 * Decode a data structure from an arbitrary location in memory.
 * @param edd The data  descriptor to use when decoding.
 * @param data_in The pointer to the data to decode into a struct.
 * @param size_in The size of the data pointed to in bytes.
 * @return NULL on failure, or a valid decoded struct pointer on success.
 *
 * This function will decode a data structure that has been encoded using
 * eet_data_descriptor_encode(), and return a data structure with all its
 * elements filled out, if successful, or NULL on failure.
 *
 * The data to be decoded is stored at the memory pointed to by @p data_in,
 * and is described by the descriptor pointed to by @p edd. The data size is
 * passed in as the value to @p size_in, ande must be greater than 0 to
 * succeed.
 *
 * This function is useful for decoding data structures delivered to the
 * application by means other than an eet file, such as an IPC or socket
 * connection, raw files, shared memory etc.
 *
 * Please see eet_data_read() for more information.
 *
 * @see eet_data_descriptor_decode_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI void *
eet_data_descriptor_decode(Eet_Data_Descriptor *edd,
                           const void *data_in,
                           int size_in);

/**
 * Encode a dsata struct to memory and return that encoded data.
 * @param edd The data  descriptor to use when encoding.
 * @param data_in The pointer to the struct to encode into data.
 * @param size_ret pointer to the an int to be filled with the decoded size.
 * @return NULL on failure, or a valid encoded data chunk on success.
 *
 * This function takes a data structutre in memory and encodes it into a
 * serialised chunk of data that can be decoded again by
 * eet_data_descriptor_decode(). This is useful for being able to transmit
 * data structures across sockets, pipes, IPC or shared file mechanisms,
 * without having to worry about memory space, machine type, endianness etc.
 *
 * The parameter @p edd must point to a valid data descriptor, and
 * @p data_in must point to the right data structure to encode. If not, the
 * encoding may fail.
 *
 * On success a non NULL valid pointer is returned and what @p size_ret
 * points to is set to the size of this decoded data, in bytes. When the
 * encoded data is no longer needed, call free() on it. On failure NULL is
 * returned and what @p size_ret points to is set to 0.
 *
 * Please see eet_data_write() for more information.
 *
 * @see eet_data_descriptor_encode_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI void *
eet_data_descriptor_encode(Eet_Data_Descriptor *edd,
                           const void *data_in,
                           int *size_ret);

/**
 * Add a basic data element to a data descriptor.
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param type The type of the member to encode.
 *
 * This macro is a convenience macro provided to add a member to
 * the data descriptor @p edd. The type of the structure is
 * provided as the @p struct_type parameter (for example: struct
 * my_struct). The @p name parameter defines a string that will be
 * used to uniquely name that member of the struct (it is suggested
 * to use the struct member itself).  The @p member parameter is
 * the actual struct member itself (for example: values), and @p type is the
 * basic data type of the member which must be one of: EET_T_CHAR, EET_T_SHORT,
 * EET_T_INT, EET_T_LONG_LONG, EET_T_FLOAT, EET_T_DOUBLE, EET_T_UCHAR,
 * EET_T_USHORT, EET_T_UINT, EET_T_ULONG_LONG or EET_T_STRING.
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_BASIC(edd, struct_type, name, member, type) \
  do {                                                                      \
       struct_type ___ett;                                                  \
       eet_data_descriptor_element_add(edd, name, type, EET_G_UNKNOWN,      \
                                       (char *)(& (___ett.member)) -        \
                                       (char *)(& (___ett)),                \
                                       0, /* 0,  */ NULL, NULL);            \
    } while(0)

/**
 * Add a sub-element type to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param subtype The type of sub-type struct to add.
 *
 * This macro lets you easily add a sub-type (a struct that's pointed to
 * by this one). All the parameters are the same as for
 * EET_DATA_DESCRIPTOR_ADD_BASIC(), with the @p subtype being the exception.
 * This must be the data descriptor of the struct that is pointed to by
 * this element.
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_SUB(edd, struct_type, name, member, subtype)   \
  do {                                                                         \
       struct_type ___ett;                                                     \
       eet_data_descriptor_element_add(edd, name, EET_T_UNKNOW, EET_G_UNKNOWN, \
                                       (char *)(& (___ett.member)) -           \
                                       (char *)(& (___ett)),                   \
                                       0, /* 0,  */ NULL, subtype);            \
    } while (0)

/**
 * Add a nested sub-element type to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param subtype The type of sub-type struct to add.
 *
 * This macro lets you easily add a sub-type: a struct that is nested into
 * this one. If your data is pointed by this element instead of being nested,
 * you should use EET_DATA_DESCRIPTOR_ADD_SUB().
 * All the parameters are the same as for EET_DATA_DESCRIPTOR_ADD_SUB().
 *
 * @since 1.8.0
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_SUB_NESTED(edd, struct_type, name, member, subtype)   \
  do {                                                                         \
       struct_type ___ett;                                                     \
       eet_data_descriptor_element_add(edd, name, EET_T_UNKNOW, EET_G_UNKNOWN_NESTED, \
                                       (char *)(& (___ett.member)) -           \
                                       (char *)(& (___ett)),                   \
                                       0, /* 0,  */ NULL, subtype);            \
    } while (0)

/**
 * Add a linked list type to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param subtype The type of linked list member to add.
 *
 * This macro lets you easily add a linked list of other data types. All the
 * parameters are the same as for EET_DATA_DESCRIPTOR_ADD_BASIC(), with the
 * @p subtype being the exception. This must be the data descriptor of the
 * element that is in each member of the linked list to be stored.
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_LIST(edd, struct_type, name, member, subtype) \
  do {                                                                        \
       struct_type ___ett;                                                    \
       eet_data_descriptor_element_add(edd, name, EET_T_UNKNOW, EET_G_LIST,   \
                                       (char *)(& (___ett.member)) -          \
                                       (char *)(& (___ett)),                  \
                                       0, /* 0,  */ NULL, subtype);           \
    } while (0)

/**
 * Add a linked list of string to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 *
 * This macro lets you easily add a linked list of char *. All the
 * parameters are the same as for EET_DATA_DESCRIPTOR_ADD_BASIC().
 *
 * @since 1.5.0
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_LIST_STRING(edd, struct_type, name, member) \
  do {                                                                      \
       struct_type ___ett;                                                  \
       eet_data_descriptor_element_add(edd, name, EET_T_STRING, EET_G_LIST, \
                                       (char *)(& (___ett.member)) -        \
                                       (char *)(& (___ett)),                \
                                       0, /* 0,  */ NULL, NULL);            \
    } while (0)

/**
 * Add a hash type to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param subtype The type of hash member to add.
 *
 * This macro lets you easily add a hash of other data types. All the
 * parameters are the same as for EET_DATA_DESCRIPTOR_ADD_BASIC(), with the
 * @p subtype being the exception. This must be the data descriptor of the
 * element that is in each member of the hash to be stored.
 * The hash keys must be strings.
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_HASH(edd, struct_type, name, member, subtype) \
  do {                                                                        \
       struct_type ___ett;                                                    \
       eet_data_descriptor_element_add(edd, name, EET_T_UNKNOW, EET_G_HASH,   \
                                       (char *)(& (___ett.member)) -          \
                                       (char *)(& (___ett)),                  \
                                       0, /* 0,  */ NULL, subtype);           \
    } while (0)

/**
 * Add a hash of string to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 *
 * This macro lets you easily add a hash of string elements. All the
 * parameters are the same as for EET_DATA_DESCRIPTOR_ADD_HASH().
 *
 * @since 1.3.4
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_HASH_STRING(edd, struct_type, name, member) \
  do {                                                                      \
       struct_type ___ett;                                                  \
       eet_data_descriptor_element_add(edd, name, EET_T_STRING, EET_G_HASH, \
                                       (char *)(& (___ett.member)) -        \
                                       (char *)(& (___ett)),                \
                                       0, /* 0,  */ NULL, NULL);            \
    } while (0)

/**
 * Add an array of basic data elements to a data descriptor.
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param type The type of the member to encode.
 *
 * This macro lets you easily add a fixed size array of basic data
 * types. All the parameters are the same as for
 * EET_DATA_DESCRIPTOR_ADD_BASIC().
 * The array must be defined with a fixed size in the declaration of the
 * struct containing it.
 *
 * @since 1.5.0
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_BASIC_ARRAY(edd, struct_type, name, member, type) \
  do {                                                                            \
       struct_type ___ett;                                                        \
       eet_data_descriptor_element_add(edd, name, type, EET_G_ARRAY,              \
                                       (char *)(& (___ett.member)) -              \
                                       (char *)(& (___ett)),                      \
                                       sizeof(___ett.member) /                    \
                                       sizeof(___ett.member[0]),                  \
                                       NULL, NULL);                               \
    } while(0)

/**
 * Add a variable array of basic data elements to a data descriptor.
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param type The type of the member to encode.
 *
 * This macro lets you easily add a variable size array of basic data
 * types. All the parameters are the same as for
 * EET_DATA_DESCRIPTOR_ADD_BASIC(). This assumes you have
 * a struct member (of type EET_T_INT) called member_count (note the
 * _count appended to the member) that holds the number of items in
 * the array. This array will be allocated separately to the struct it
 * is in.
 *
 * @since 1.6.0
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_BASIC_VAR_ARRAY(edd, struct_type, name, member, type) \
  do {                                                                                \
       struct_type ___ett;                                                            \
       eet_data_descriptor_element_add(edd, name, type, EET_G_VAR_ARRAY,              \
                                       (char *)(& (___ett.member)) -                  \
                                       (char *)(& (___ett)),                          \
                                       (char *)(& (___ett.member ## _count)) -        \
                                       (char *)(& (___ett)),                          \
                                       NULL,                                          \
                                       NULL);                                         \
    } while(0)

/**
 * Add a fixed size array type to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param subtype The type of hash member to add.
 *
 * This macro lets you easily add a fixed size array of other data
 * types. All the parameters are the same as for
 * EET_DATA_DESCRIPTOR_ADD_BASIC(), with the @p subtype being the
 * exception. This must be the data descriptor of the element that
 * is in each member of the array to be stored.
 * The array must be defined with a fixed size in the declaration of the
 * struct containing it.
 *
 * @since 1.0.2
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_ARRAY(edd, struct_type, name, member, subtype)   \
  do {                                                                           \
       struct_type ___ett;                                                       \
       eet_data_descriptor_element_add(edd, name, EET_T_UNKNOW, EET_G_ARRAY,     \
                                       (char *)(& (___ett.member)) -             \
                                       (char *)(& (___ett)),                     \
                                       /* 0,  */ sizeof(___ett.member) /         \
                                       sizeof(___ett.member[0]), NULL, subtype); \
    } while (0)

/**
 * Add a variable size array type to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param subtype The type of hash member to add.
 *
 * This macro lets you easily add a variable size array of other data
 * types. All the parameters are the same as for
 * EET_DATA_DESCRIPTOR_ADD_BASIC(), with the @p subtype being the
 * exception. This must be the data descriptor of the element that
 * is in each member of the array to be stored. This assumes you have
 * a struct member (of type EET_T_INT) called member_count (note the
 * _count appended to the member) that holds the number of items in
 * the array. This array will be allocated separately to the struct it
 * is in.
 *
 * @since 1.0.2
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_VAR_ARRAY(edd, struct_type, name, member, subtype) \
  do {                                                                             \
       struct_type ___ett;                                                         \
       eet_data_descriptor_element_add(edd,                                        \
                                       name,                                       \
                                       EET_T_UNKNOW,                               \
                                       EET_G_VAR_ARRAY,                            \
                                       (char *)(& (___ett.member)) -               \
                                       (char *)(& (___ett)),                       \
                                       (char *)(& (___ett.member ## _count)) -     \
                                       (char *)(& (___ett)),                       \
                                       /* 0,  */ NULL,                             \
                                       subtype);                                   \
    } while (0)

/**
 * Add a variable size array type to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 *
 * This macro lets you easily add a variable size array of strings. All
 * the parameters are the same as for EET_DATA_DESCRIPTOR_ADD_BASIC().
 *
 * @since 1.4.0
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_VAR_ARRAY_STRING(edd, struct_type, name, member) \
  do {                                                                           \
       struct_type ___ett;                                                       \
       eet_data_descriptor_element_add(edd,                                      \
                                       name,                                     \
                                       EET_T_STRING,                             \
                                       EET_G_VAR_ARRAY,                          \
                                       (char *)(& (___ett.member)) -             \
                                       (char *)(& (___ett)),                     \
                                       (char *)(& (___ett.member ## _count)) -   \
                                       (char *)(& (___ett)),                     \
                                       /* 0,  */ NULL,                           \
                                       NULL);                                    \
    } while (0)

/**
 * Add an union type to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param type_member The member that give hints on what is in the union.
 * @param unified_type Describe all possible type the union could handle.
 *
 * This macro lets you easily add an union with a member that specify what is inside.
 * The @p unified_type is an Eet_Data_Descriptor, but only the entry that match the name
 * returned by type_get will be used for each serialized data. The type_get and type_set
 * callback of unified_type should be defined.
 *
 * @since 1.2.4
 * @ingroup Eet_Data_Group
 * @see Eet_Data_Descriptor_Class
 */
#define EET_DATA_DESCRIPTOR_ADD_UNION(edd, struct_type, name, member, type_member, unified_type) \
  do {                                                                                           \
       struct_type ___ett;                                                                       \
       eet_data_descriptor_element_add(edd, name, EET_T_UNKNOW, EET_G_UNION,                     \
                                       (char *)(& (___ett.member)) -                             \
                                       (char *)(& (___ett)),                                     \
                                       (char *)(& (___ett.type_member)) -                        \
                                       (char *)(& (___ett)),                                     \
                                       NULL, unified_type);                                      \
    } while (0)

/**
 * Add a automatically selectable type to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param type_member The member that give hints on what is in the union.
 * @param unified_type Describe all possible type the union could handle.
 *
 * This macro lets you easily define what the content of @p member points to depending of
 * the content of @p type_member. The type_get and type_set callback of unified_type should
 * be defined. If the the type is not know at the time of restoring it, eet will still call
 * type_set of @p unified_type but the pointer will be set to a serialized binary representation
 * of what eet know. This make it possible, to save this pointer again by just returning the string
 * given previously and telling it by setting unknow to EINA_TRUE.
 *
 * @since 1.2.4
 * @ingroup Eet_Data_Group
 * @see Eet_Data_Descriptor_Class
 */
#define EET_DATA_DESCRIPTOR_ADD_VARIANT(edd, struct_type, name, member, type_member, unified_type) \
  do {                                                                                             \
       struct_type ___ett;                                                                         \
       eet_data_descriptor_element_add(edd, name, EET_T_UNKNOW, EET_G_VARIANT,                     \
                                       (char *)(& (___ett.member)) -                               \
                                       (char *)(& (___ett)),                                       \
                                       (char *)(& (___ett.type_member)) -                          \
                                       (char *)(& (___ett)),                                       \
                                       NULL, unified_type);                                        \
    } while (0)

/**
 * Add a mapping to a data descriptor that will be used by union, variant or inherited type
 * @param unified_type The data descriptor to add the mapping to.
 * @param name The string name to get/set type.
 * @param subtype The matching data descriptor.
 *
 * @since 1.2.4
 * @ingroup Eet_Data_Group
 * @see Eet_Data_Descriptor_Class
 */
#define EET_DATA_DESCRIPTOR_ADD_MAPPING(unified_type, name, subtype) \
  eet_data_descriptor_element_add(unified_type,                      \
                                  name,                              \
                                  EET_T_UNKNOW,                      \
                                  EET_G_UNKNOWN,                     \
                                  0,                                 \
                                  0,                                 \
                                  NULL,                              \
                                  subtype)

/**
 * Add a mapping of a basic type to a data descriptor that will be used by a union type.
 * @param unified_type The data descriptor to add the mapping to.
 * @param name The string name to get/set type.
 * @param basic_type The matching basic type.
 *
 * @since 1.8
 * @ingroup Eet_Data_Group
 * @see Eet_Data_Descriptor_Class
 */
#define EET_DATA_DESCRIPTOR_ADD_MAPPING_BASIC(unified_type, name, basic_type) \
  eet_data_descriptor_element_add(unified_type,                               \
                                  name,                                       \
                                  basic_type,                                 \
                                  EET_G_UNKNOWN,                              \
                                  0,                                          \
                                  0,                                          \
                                  NULL,                                       \
                                  NULL)
/**
 * @defgroup Eet_Data_Cipher_Group Eet Data Serialization using A Ciphers
 *
 * Most of the @ref Eet_Data_Group have alternative versions that
 * accounts for ciphers to protect their content.
 *
 * @see @ref Eet_Cipher_Group
 *
 * @ingroup Eet_Data_Group
 */

/**
 * Read a data structure from an eet file and decodes it using a cipher.
 * @param ef The eet file handle to read from.
 * @param edd The data descriptor handle to use when decoding.
 * @param name The key the data is stored under in the eet file.
 * @param cipher_key The key to use as cipher.
 * @return A pointer to the decoded data structure.
 *
 * This function decodes a data structure stored in an eet file, returning
 * a pointer to it if it decoded successfully, or NULL on failure. This
 * can save a programmer dozens of hours of work in writing configuration
 * file parsing and writing code, as eet does all that work for the program
 * and presents a program-friendly data structure, just as the programmer
 * likes. Eet can handle members being added or deleted from the data in
 * storage and safely zero-fills unfilled members if they were not found
 * in the data. It checks sizes and headers whenever it reads data, allowing
 * the programmer to not worry about corrupt data.
 *
 * Once a data structure has been described by the programmer with the
 * fields they wish to save or load, storing or retrieving a data structure
 * from an eet file, or from a chunk of memory is as simple as a single
 * function call.
 *
 * @see eet_data_read()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI void *
eet_data_read_cipher(Eet_File *ef,
                     Eet_Data_Descriptor *edd,
                     const char *name,
                     const char *cipher_key);

/**
 * Read a data structure from an eet file and decodes it into a buffer using a cipher,
 * @param ef The eet file handle to read from.
 * @param edd The data descriptor handle to use when decoding.
 * @param name The key the data is stored under in the eet file.
 * @param cipher_key The key to use as cipher.
 * @param buffer Buffer.
 * @param buffer_size The buffer size.
 * @return A pointer to buffer if successful and NULL on error.
 *
 * This function decodes a data structure stored in an eet file, returning
 * a pointer to it if it decoded successfully, or NULL on failure. This
 * can save a programmer dozens of hours of work in writing configuration
 * file parsing and writing code, as eet does all that work for the program
 * and presents a program-friendly data structure, just as the programmer
 * likes. Eet can handle members being added or deleted from the data in
 * storage and safely zero-fills unfilled members if they were not found
 * in the data. It checks sizes and headers whenever it reads data, allowing
 * the programmer to not worry about corrupt data.
 *
 * Once a data structure has been described by the programmer with the
 * fields they wish to save or load, storing or retrieving a data structure
 * from an eet file, or from a chunk of memory is as simple as a single
 * function call.
 *
 * @see eet_data_read_cipher()
 *
 * @since 1.10.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI void *
eet_data_read_cipher_buffer(Eet_File            *ef,
                            Eet_Data_Descriptor *edd,
                            const char          *name,
                            const char          *cipher_key,
                            char                *buffer,
                            int                 buffer_size);

/**
 * Read a data structure from an eet extended attribute and decodes it using a cipher.
 * @param filename The file to extract the extended attribute from.
 * @param attribute The attribute to get the data from.
 * @param edd The data descriptor handle to use when decoding.
 * @param cipher_key The key to use as cipher.
 * @return A pointer to the decoded data structure.
 *
 * This function decodes a data structure stored in an eet extended attribute,
 * returning a pointer to it if it decoded successfully, or NULL on failure.
 * Eet can handle members being added or deleted from the data in
 * storage and safely zero-fills unfilled members if they were not found
 * in the data. It checks sizes and headers whenever it reads data, allowing
 * the programmer to not worry about corrupt data.
 *
 * Once a data structure has been described by the programmer with the
 * fields they wish to save or load, storing or retrieving a data structure
 * from an eet file, from a chunk of memory or from an extended attribute
 * is as simple as a single function call.
 *
 * @since 1.5.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI void *
eet_data_xattr_cipher_get(const char *filename,
                          const char *attribute,
                          Eet_Data_Descriptor *edd,
                          const char *cipher_key);

/**
 * Write a data structure from memory and store in an eet file
 * using a cipher.
 * @param ef The eet file handle to write to.
 * @param edd The data descriptor to use when encoding.
 * @param name The key to store the data under in the eet file.
 * @param cipher_key The key to use as cipher.
 * @param data A pointer to the data structure to save and encode.
 * @param compress Compression flags for storage.
 * @return bytes written on successful write, 0 on failure.
 *
 * This function is the reverse of eet_data_read_cipher(), saving a data structure
 * to an eet file.
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI int
eet_data_write_cipher(Eet_File *ef,
                      Eet_Data_Descriptor *edd,
                      const char *name,
                      const char *cipher_key,
                      const void *data,
                      int compress);

/**
 * Write a data structure from memory and store in an eet extended attribute
 * using a cipher.
 * @param filename The file to write the extended attribute to.
 * @param attribute The attribute to store the data to.
 * @param edd The data descriptor to use when encoding.
 * @param cipher_key The key to use as cipher.
 * @param data A pointer to the data structure to save and encode.
 * @param flags The policy to use when setting the data.
 * @return EINA_TRUE on success, EINA_FALSE on failure.
 *
 * This function is the reverse of eet_data_xattr_cipher_get(), saving a data structure
 * to an eet extended attribute.
 *
 * @since 1.5.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI Eina_Bool
eet_data_xattr_cipher_set(const char *filename,
                          const char *attribute,
                          Eet_Data_Descriptor *edd,
                          const char *cipher_key,
                          const void *data,
                          Eina_Xattr_Flags flags);

/**
 * Dump an eet encoded data structure into ascii text using a cipher.
 * @param data_in The pointer to the data to decode into a struct.
 * @param cipher_key The key to use as cipher.
 * @param size_in The size of the data pointed to in bytes.
 * @param dumpfunc The function to call passed a string when new
 *        data is converted to text
 * @param dumpdata The data to pass to the @p dumpfunc callback.
 * @return 1 on success, 0 on failure
 *
 * This function will take a chunk of data encoded by
 * eet_data_descriptor_encode() and convert it into human readable
 * ascii text.  It does this by calling the @p dumpfunc callback
 * for all new text that is generated. This callback should append
 * to any existing text buffer and will be passed the pointer @p
 * dumpdata as a parameter as well as a string with new text to be
 * appended.
 *
 * Example:
 *
 * @code
 * void output(void *data, const char *string)
 * {
 *   printf("%s", string);
 * }
 *
 * void dump(const char *file)
 * {
 *   FILE *f;
 *   int len;
 *   void *data;
 *
 *   f = fopen(file, "r");
 *   fseek(f, 0, SEEK_END);
 *   len = ftell(f);
 *   rewind(f);
 *   data = malloc(len);
 *   fread(data, len, 1, f);
 *   fclose(f);
 *   eet_data_text_dump_cipher(data, cipher_key, len, output, NULL);
 * }
 * @endcode
 *
 * @see eet_data_text_dump()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI int
eet_data_text_dump_cipher(const void *data_in,
                          const char *cipher_key,
                          int size_in,
                          Eet_Dump_Callback dumpfunc,
                          void *dumpdata);

/**
 * Take an ascii encoding from eet_data_text_dump() and re-encode
 * in binary using a cipher.
 * @param text The pointer to the string data to parse and encode.
 * @param cipher_key The key to use as cipher.
 * @param textlen The size of the string in bytes (not including 0
 *        byte terminator).
 * @param size_ret This gets filled in with the encoded data blob
 *        size in bytes.
 * @return The encoded data on success, NULL on failure.
 *
 * This function will parse the string pointed to by @p text and return
 * an encoded data lump the same way eet_data_descriptor_encode() takes an
 * in-memory data struct and encodes into a binary blob. @p text is a normal
 * C string.
 *
 * @see eet_data_text_undump()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI void *
eet_data_text_undump_cipher(const char *text,
                            const char *cipher_key,
                            int textlen,
                            int *size_ret);

/**
 * Dump an eet encoded data structure from an eet file into ascii
 * text using a cipher.
 * @param ef A valid eet file handle.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param cipher_key The key to use as cipher.
 * @param dumpfunc The function to call passed a string when new
 *        data is converted to text
 * @param dumpdata The data to pass to the @p dumpfunc callback.
 * @return 1 on success, 0 on failure
 *
 * This function will take an open and valid eet file from
 * eet_open() request the data encoded by
 * eet_data_descriptor_encode() corresponding to the key @p name
 * and convert it into human readable ascii text. It does this by
 * calling the @p dumpfunc callback for all new text that is
 * generated. This callback should append to any existing text
 * buffer and will be passed the pointer @p dumpdata as a parameter
 * as well as a string with new text to be appended.
 *
 * @see eet_data_dump()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI int
eet_data_dump_cipher(Eet_File *ef,
                     const char *name,
                     const char *cipher_key,
                     Eet_Dump_Callback dumpfunc,
                     void *dumpdata);

/**
 * Take an ascii encoding from eet_data_dump() and re-encode in
 * binary using a cipher.
 * @param ef A valid eet file handle.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param cipher_key The key to use as cipher.
 * @param text The pointer to the string data to parse and encode.
 * @param textlen The size of the string in bytes (not including 0
 *        byte terminator).
 * @param compress Compression flags (1 == compress, 0 = don't compress).
 * @return 1 on success, 0 on failure
 *
 * This function will parse the string pointed to by @p text,
 * encode it the same way eet_data_descriptor_encode() takes an
 * in-memory data struct and encodes into a binary blob.
 *
 * The data (optionally compressed) will be in ram, pending a flush to
 * disk (it will stay in ram till the eet file handle is closed though).
 *
 * @see eet_data_undump()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI int
eet_data_undump_cipher(Eet_File *ef,
                       const char *name,
                       const char *cipher_key,
                       const char *text,
                       int textlen,
                       int compress);

/**
 * Decode a data structure from an arbitrary location in memory
 * using a cipher.
 * @param edd The data  descriptor to use when decoding.
 * @param data_in The pointer to the data to decode into a struct.
 * @param cipher_key The key to use as cipher.
 * @param size_in The size of the data pointed to in bytes.
 * @return NULL on failure, or a valid decoded struct pointer on success.
 *
 * This function will decode a data structure that has been encoded using
 * eet_data_descriptor_encode(), and return a data structure with all its
 * elements filled out, if successful, or NULL on failure.
 *
 * The data to be decoded is stored at the memory pointed to by @p data_in,
 * and is described by the descriptor pointed to by @p edd. The data size is
 * passed in as the value to @p size_in, ande must be greater than 0 to
 * succeed.
 *
 * This function is useful for decoding data structures delivered to the
 * application by means other than an eet file, such as an IPC or socket
 * connection, raw files, shared memory etc.
 *
 * Please see eet_data_read() for more information.
 *
 * @see eet_data_descriptor_decode()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI void *
eet_data_descriptor_decode_cipher(Eet_Data_Descriptor *edd,
                                  const void *data_in,
                                  const char *cipher_key,
                                  int size_in);

/**
 * Encode a data struct to memory and return that encoded data
 * using a cipher.
 * @param edd The data  descriptor to use when encoding.
 * @param data_in The pointer to the struct to encode into data.
 * @param cipher_key The key to use as cipher.
 * @param size_ret pointer to the an int to be filled with the decoded size.
 * @return NULL on failure, or a valid encoded data chunk on success.
 *
 * This function takes a data structutre in memory and encodes it into a
 * serialised chunk of data that can be decoded again by
 * eet_data_descriptor_decode(). This is useful for being able to transmit
 * data structures across sockets, pipes, IPC or shared file mechanisms,
 * without having to worry about memory space, machine type, endianess etc.
 *
 * The parameter @p edd must point to a valid data descriptor, and
 * @p data_in must point to the right data structure to encode. If not, the
 * encoding may fail.
 *
 * On success a non NULL valid pointer is returned and what @p size_ret
 * points to is set to the size of this decoded data, in bytes. When the
 * encoded data is no longer needed, call free() on it. On failure NULL is
 * returned and what @p size_ret points to is set to 0.
 *
 * Please see eet_data_write() for more information.
 *
 * @see eet_data_descriptor_encode()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI void *
eet_data_descriptor_encode_cipher(Eet_Data_Descriptor *edd,
                                  const void *data_in,
                                  const char *cipher_key,
                                  int *size_ret);

/**
 * @defgroup Eet_Node_Group Low-level Serialization Structures.
 * @ingroup Eet
 *
 * Functions that create, destroy and manipulate serialization nodes
 * used by @ref Eet_Data_Group.
 *
 * @{
 */

/**
 * @typedef Eet_Node
 * Opaque handle to manage serialization node.
 */
typedef struct _Eet_Node Eet_Node;

/**
 * @typedef Eet_Node_Data
 * Contains an union that can fit any kind of node.
 */
typedef struct _Eet_Node_Data Eet_Node_Data;

/**
 * @struct _Eet_Node_Data
 * Contains an union that can fit any kind of node.
 */
struct _Eet_Node_Data
{
   union {
      char               c;
      short              s;
      int                i;
      long long          l;
      float              f;
      double             d;
      unsigned char      uc;
      unsigned short     us;
      unsigned int       ui;
      unsigned long long ul;
      const char        *str;
   } value;
};

/**
 * @}
 */

/**
 * Create a new character node.
 * @param name Name of the node.
 * @param c Character value.
 * @return A new character node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_char_new(const char *name,
                  char c);

/**
 * Create a new short node.
 * @param name Name of the node.
 * @param s short value.
 * @return A new short node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_short_new(const char *name,
                   short s);

/**
 * Create a new integer node.
 * @param name Name of the node.
 * @param i integer value.
 * @return A new integer node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_int_new(const char *name,
                 int i);

/**
 * Create a new long long integer node.
 * @param name Name of the node.
 * @param l long long integer value.
 * @return A new long long integer node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_long_long_new(const char *name,
                       long long l);

/**
 * Create a new float node.
 * @param name Name of the node.
 * @param f float value.
 * @return A new float node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_float_new(const char *name,
                   float f);

/**
 * Create a new double node.
 * @param name Name of the node.
 * @param d double value.
 * @return A new double node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_double_new(const char *name,
                    double d);

/**
 * Create a new unsigned character node.
 * @param name Name of the node.
 * @param uc unsigned char value.
 * @return A new unsigned char node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_unsigned_char_new(const char *name,
                           unsigned char uc);

/**
 * Create a new unsigned short node.
 * @param name Name of the node.
 * @param us unsigned short value.
 * @return A new unsigned short node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_unsigned_short_new(const char *name,
                            unsigned short us);

/**
 * Create a new unsigned integer node.
 * @param name Name of the node.
 * @param ui unsigned integer value.
 * @return A new unsigned integer node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_unsigned_int_new(const char *name,
                          unsigned int ui);

/**
 * Create a new unsigned long long integer node.
 * @param name Name of the node.
 * @param l unsigned long long integer value.
 * @return A new unsigned long long integer node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_unsigned_long_long_new(const char *name,
                                unsigned long long l);

/**
 * Create a new string node.
 * @param name Name of the node.
 * @param str string value.
 * @return A new string node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_string_new(const char *name,
                    const char *str);

/**
 * Create a new inlined string node.
 * @param name Name of the node.
 * @param str string value.
 * @return A new inlined string node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_inlined_string_new(const char *name,
                            const char *str);

/**
 * Create a new empty node.
 * @param name Name of the node.
 * @return A new empty node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_null_new(const char *name);

/**
 * Create a new list node.
 * @param name Name of the node.
 * @param nodes list of nodes.
 * @return A new list node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_list_new(const char *name,
                  Eina_List *nodes);

/**
 * Create a new array node.
 * @param name Name of the node.
 * @param count number of nodes
 * @param nodes list of nodes.
 * @return A new array node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_array_new(const char *name,
                   int count,
                   Eina_List *nodes);

/**
 * Create a new variable array node.
 * @param name Name of the node.
 * @param nodes list of nodes.
 * @return A new variable array node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_var_array_new(const char *name,
                       Eina_List *nodes);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
/**
 * Create a new short node.
 * @param name Name of the node.
 * @param s short value.
 * @return A new short node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_hash_new(const char *name,
                  const char *key,
                  Eet_Node *node);

/**
 * Create a new struct node.
 * @param name Name of the node.
 * @param nodes list of nodes.
 * @return A new struct node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_struct_new(const char *name,
                    Eina_List *nodes);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
/**
 * Create a new short node.
 * @param name Name of the node.
 * @param s short value.
 * @return A new short node.
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_struct_child_new(const char *parent,
                          Eet_Node *child);

/**
 * @brief Get a node's child nodes
 * @param node The node
 * @return The first child node which contains a pointer to the
 * next child node and the parent.
 * @since 1.5
 */
EAPI Eet_Node *
eet_node_children_get(Eet_Node *node);

/**
 * @brief Get the next node in a list of nodes
 * @param node The node
 * @return A node which contains a pointer to the
 * next child node and the parent.
 * @since 1.5
 */
EAPI Eet_Node *
eet_node_next_get(Eet_Node *node);

/**
 * @brief Get the parent node of a node
 * @param node The node
 * @return The parent node of @p node
 * @since 1.5
 */
EAPI Eet_Node *
eet_node_parent_get(Eet_Node *node);

/**
 * @brief Append a "list" node TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI void
eet_node_list_append(Eet_Node *parent,
                     const char *name,
                     Eet_Node *child);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI void
eet_node_struct_append(Eet_Node *parent,
                       const char *name,
                       Eet_Node *child);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI void
eet_node_hash_add(Eet_Node *parent,
                  const char *name,
                  const char *key,
                  Eet_Node *child);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI void
eet_node_dump(Eet_Node *n,
              int dumplevel,
              Eet_Dump_Callback dumpfunc,
              void *dumpdata);

/**
 * @brief Return the type of a node
 * @param node The node
 * @return The node's type (EET_T_$TYPE)
 * @since 1.5
 */
EAPI int
eet_node_type_get(Eet_Node *node);

/**
 * @brief Return the node's data
 * @param node The node
 * @return The data contained in the node
 * @since 1.5
 */
EAPI Eet_Node_Data *
eet_node_value_get(Eet_Node *node);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI void
eet_node_del(Eet_Node *n);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI void *
eet_data_node_encode_cipher(Eet_Node *node,
                            const char *cipher_key,
                            int *size_ret);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_data_node_decode_cipher(const void *data_in,
                            const char *cipher_key,
                            int size_in);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_data_node_read_cipher(Eet_File *ef,
                          const char *name,
                          const char *cipher_key);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI int
eet_data_node_write_cipher(Eet_File *ef,
                           const char *name,
                           const char *cipher_key,
                           Eet_Node *node,
                           int compress);

/* EXPERIMENTAL: THIS API MAY CHANGE IN THE FUTURE, USE IT ONLY IF YOU KNOW WHAT YOU ARE DOING. */

/**
 * @typedef Eet_Node_Walk
 * Describes how to walk trees of #Eet_Node.
 */
typedef struct _Eet_Node_Walk Eet_Node_Walk;

/**
 * @typedef (*Eet_Node_Walk_Struct_Alloc_Callback)
 *
 * Callback prototype for Eet_Node_Walk_Struct_Alloc
 * @param type The allocation type
 * @param user_data the data passed by the user to the callback
 */
typedef void *              (*Eet_Node_Walk_Struct_Alloc_Callback)(const char *type, void *user_data);

/**
 * @typedef (*Eet_Node_Walk_Struct_Add_Callback)
 *
 * Callback prototype for Eet_Node_Walk_Struct_Add
 * @param parent The parent node
 * @param name the name for the new node
 * @param child the child node
 * @param user_data the data passed by the user to the callback
 */
typedef void                (*Eet_Node_Walk_Struct_Add_Callback)(void *parent, const char *name, void *child, void *user_data);

/**
 * @typedef (*Eet_Node_Walk_Array_Callback)
 *
 * Callback prototype for Eet_Node_Walk_Array
 * @param variable EINA_TRUE or EINA_FALSE
 * @param name a name
 * @param count a counter
 * @param user_data the data passed by the user to the callback
 */
typedef void *              (*Eet_Node_Walk_Array_Callback)(Eina_Bool variable, const char *name, int count, void *user_data);

typedef void                (*Eet_Node_Walk_Insert_Callback)(void *array, int index, void *child, void *user_data);
typedef void *              (*Eet_Node_Walk_List_Callback)(const char *name, void *user_data);
typedef void                (*Eet_Node_Walk_Append_Callback)(void *list, void *child, void *user_data);
typedef void *              (*Eet_Node_Walk_Hash_Callback)(void *parent, const char *name, const char *key, void *value, void *user_data);
typedef void *              (*Eet_Node_Walk_Simple_Callback)(int type, Eet_Node_Data *data, void *user_data);

/**
 * @struct _Eet_Node_Walk
 * Describes how to walk trees of #Eet_Node.
 */
struct _Eet_Node_Walk
{
   Eet_Node_Walk_Struct_Alloc_Callback struct_alloc;
   Eet_Node_Walk_Struct_Add_Callback   struct_add;
   Eet_Node_Walk_Array_Callback        array;
   Eet_Node_Walk_Insert_Callback       insert;
   Eet_Node_Walk_List_Callback         list;
   Eet_Node_Walk_Append_Callback       append;
   Eet_Node_Walk_Hash_Callback         hash;
   Eet_Node_Walk_Simple_Callback       simple;
};

EAPI void *
eet_node_walk(void *parent,
              const char *name,
              Eet_Node *root,
              Eet_Node_Walk *cb,
              void *user_data);

/*******/

/**
 * @defgroup Eet_Connection_Group Helper function to use eet over a network link
 * @ingroup Eet
 *
 * Function that reconstruct and prepare packet of @ref Eet_Data_Group to be send.
 *
 */

/**
 * @typedef Eet_Connection
 * Opaque handle to track paquet for a specific connection.
 *
 * @ingroup Eet_Connection_Group
 */
typedef struct _Eet_Connection Eet_Connection;

/**
 * @typedef Eet_Read_Cb
 * Called back when an @ref Eet_Data_Group has been received completely and could be used.
 *
 * @ingroup Eet_Connection_Group
 */
typedef Eina_Bool Eet_Read_Cb (const void *eet_data, size_t size, void *user_data);

/**
 * @typedef Eet_Write_Cb
 * Called back when a packet containing @ref Eet_Data_Group data is ready to be send.
 *
 * @ingroup Eet_Connection_Group
 */
typedef Eina_Bool Eet_Write_Cb (const void *data, size_t size, void *user_data);

/**
 * Instanciate a new connection to track.
 * @param eet_read_cb Function to call when one Eet_Data packet has been fully assemble.
 * @param eet_write_cb Function to call when one Eet_Data packet is ready to be send over the wire.
 * @param user_data Pointer provided to both functions to be used as a context handler.
 * @return NULL on failure, or a valid Eet_Connection handler.
 *
 * For every connection to track you will need a separate Eet_Connection provider.
 *
 * @since 1.2.4
 * @ingroup Eet_Connection_Group
 */
EAPI Eet_Connection *
eet_connection_new(Eet_Read_Cb *eet_read_cb,
                   Eet_Write_Cb *eet_write_cb,
                   const void *user_data);

/**
 * Process a raw packet received over the link
 * @param conn Connection handler to track.
 * @param data Raw data packet.
 * @param size The size of that packet.
 * @return 0 on complete success, any other value indicate where in the stream it got wrong (It could be before that packet).
 *
 * Every time you receive a packet related to your connection, you should pass
 * it to that function so that it could process and assemble packet has you
 * receive it. It will automatically call Eet_Read_Cb when one is fully received.
 *
 * @since 1.2.4
 * @ingroup Eet_Connection_Group
 */
EAPI int
eet_connection_received(Eet_Connection *conn,
                        const void *data,
                        size_t size);

/**
 * Tell if the Eet_Connection as received some partial data.
 * @param conn Connection handler to request.
 * @return EINA_TRUE if there is some data pending inside, EINA_FALSE otherwise.
 *
 * Eet_Connection buffer data until the received data can be unserialized correctly. This
 * function let you know if there is some data inside that buffer waiting for more data to
 * be received before being processed.
 *
 * @since 1.7
 * @ingroup Eet_Connection_Group
 */
EAPI Eina_Bool eet_connection_empty(Eet_Connection *conn);

/**
 * Convert a complex structure and prepare it to be send.
 * @param conn Connection handler to track.
 * @param edd The data descriptor to use when encoding.
 * @param data_in The pointer to the struct to encode into data.
 * @param cipher_key The key to use as cipher.
 * @return EINA_TRUE if the data where correctly send, EINA_FALSE if they don't.
 *
 * This function serialize data_in with edd, assemble the packet and call
 * Eet_Write_Cb when ready. The data passed Eet_Write_Cb are temporary allocated
 * and will vanish just after the return of the callback.
 *
 * @see eet_data_descriptor_encode_cipher
 *
 * @since 1.2.4
 * @ingroup Eet_Connection_Group
 */
EAPI Eina_Bool
eet_connection_send(Eet_Connection *conn,
                    Eet_Data_Descriptor *edd,
                    const void *data_in,
                    const char *cipher_key);

/**
 * Convert a Eet_Node tree and prepare it to be send.
 * @param conn Connection handler to track.
 * @param node The data tree to use when encoding.
 * @param cipher_key The key to use as cipher.
 * @return EINA_TRUE if the data where correctly send, EINA_FALSE if they don't.
 *
 * This function serialize node, assemble the packet and call
 * Eet_Write_Cb when ready. The data passed Eet_Write_Cb are temporary allocated
 * and will vanish just after the return of the callback.
 *
 * @see eet_data_node_encode_cipher
 *
 * @since 1.2.4
 * @ingroup Eet_Connection_Group
 */
EAPI Eina_Bool
eet_connection_node_send(Eet_Connection *conn,
                         Eet_Node *node,
                         const char *cipher_key);

/**
 * Close a connection and lost its track.
 * @param conn Connection handler to close.
 * @param on_going Signal if a partial packet wasn't completed.
 * @return the user_data passed to both callback.
 *
 * @since 1.2.4
 * @ingroup Eet_Connection_Group
 */
EAPI void *
eet_connection_close(Eet_Connection *conn,
                     Eina_Bool *on_going);

/***************************************************************************/

#ifdef __cplusplus
}
#endif /* ifdef __cplusplus */

#endif /* ifndef _EET_H */