summaryrefslogtreecommitdiff
path: root/src/lib/eina/eina_accessor.c
blob: 67494987a9590444390b4ac0475582dbb9d5f2d3 (plain) (blame)
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
/* EINA - EFL data type library
 * Copyright (C) 2002-2008 Cedric Bail
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library;
 * if not, see <http://www.gnu.org/licenses/>.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <stdlib.h>

#include "eina_config.h"
#include "eina_private.h"

/* undefs EINA_ARG_NONULL() so NULL checks are not compiled out! */
#include "eina_safety_checks.h"
#include "eina_accessor.h"

/*============================================================================*
*                                  Local                                     *
*============================================================================*/

/**
 * @cond LOCAL
 */

static const char EINA_MAGIC_ACCESSOR_STR[] = "Eina Accessor";

#define EINA_MAGIC_CHECK_ACCESSOR(d)                            \
   do {                                                          \
        if (!EINA_MAGIC_CHECK(d, EINA_MAGIC_ACCESSOR)) {              \
             EINA_MAGIC_FAIL(d, EINA_MAGIC_ACCESSOR); }                  \
     } while(0)

/**
 * @endcond
 */

/*============================================================================*
*                                 Global                                     *
*============================================================================*/

/**
 * @internal
 * @brief Initialize the accessor module.
 *
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This function sets up the accessor module of Eina. It is called by
 * eina_init().
 *
 * @see eina_init()
 */
Eina_Bool
eina_accessor_init(void)
{
   return eina_magic_string_set(EINA_MAGIC_ACCESSOR, EINA_MAGIC_ACCESSOR_STR);
}

/**
 * @internal
 * @brief Shut down the accessor module.
 *
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This function shuts down the accessor module set up by
 * eina_accessor_init(). It is called by eina_shutdown().
 *
 * @see eina_shutdown()
 */
Eina_Bool
eina_accessor_shutdown(void)
{
   return EINA_TRUE;
}

/*============================================================================*
*                                   API                                      *
*============================================================================*/


EAPI void
eina_accessor_free(Eina_Accessor *accessor)
{
   if (!accessor)
     return;

   EINA_MAGIC_CHECK_ACCESSOR(accessor);
   EINA_SAFETY_ON_NULL_RETURN(accessor->free);
   accessor->free(accessor);
}

EAPI void *
eina_accessor_container_get(Eina_Accessor *accessor)
{
   EINA_MAGIC_CHECK_ACCESSOR(accessor);
   EINA_SAFETY_ON_NULL_RETURN_VAL(accessor,                NULL);
   EINA_SAFETY_ON_NULL_RETURN_VAL(accessor->get_container, NULL);
   return accessor->get_container(accessor);
}

EAPI Eina_Bool
eina_accessor_data_get(Eina_Accessor *accessor,
                       unsigned int position,
                       void **data)
{
   EINA_MAGIC_CHECK_ACCESSOR(accessor);
   EINA_SAFETY_ON_NULL_RETURN_VAL(accessor,         EINA_FALSE);
   EINA_SAFETY_ON_NULL_RETURN_VAL(accessor->get_at, EINA_FALSE);
   EINA_SAFETY_ON_NULL_RETURN_VAL(data,             EINA_FALSE);
   return accessor->get_at(accessor, position, data);
}

EAPI void
eina_accessor_over(Eina_Accessor *accessor,
                   Eina_Each_Cb cb,
                   unsigned int start,
                   unsigned int end,
                   const void *fdata)
{
   const void *container;
   void *data;
   unsigned int i;

   if (!accessor) return;

   EINA_MAGIC_CHECK_ACCESSOR(accessor);
   EINA_SAFETY_ON_NULL_RETURN(accessor->get_container);
   EINA_SAFETY_ON_NULL_RETURN(accessor->get_at);
   EINA_SAFETY_ON_NULL_RETURN(cb);
   EINA_SAFETY_ON_FALSE_RETURN(start < end);

   if (!eina_accessor_lock(accessor))
      return;

   container = accessor->get_container(accessor);
   for (i = start; i < end && accessor->get_at(accessor, i, &data) == EINA_TRUE;
        ++i)
      if (cb(container, data, (void *)fdata) != EINA_TRUE)
	 goto on_exit;

 on_exit:
   (void) eina_accessor_unlock(accessor);
}

EAPI Eina_Bool
eina_accessor_lock(Eina_Accessor *accessor)
{
   EINA_MAGIC_CHECK_ACCESSOR(accessor);
   EINA_SAFETY_ON_NULL_RETURN_VAL(accessor, EINA_FALSE);

   if (accessor->lock)
      return accessor->lock(accessor);
   return EINA_TRUE;
}

EAPI Eina_Accessor*
eina_accessor_clone(Eina_Accessor *accessor)
{
   EINA_MAGIC_CHECK_ACCESSOR(accessor);
   EINA_SAFETY_ON_NULL_RETURN_VAL(accessor, NULL);

   if (accessor->clone)
      return accessor->clone(accessor);

   return NULL;
}

EAPI Eina_Bool
eina_accessor_unlock(Eina_Accessor *accessor)
{
   EINA_MAGIC_CHECK_ACCESSOR(accessor);
   EINA_SAFETY_ON_NULL_RETURN_VAL(accessor, EINA_FALSE);

   if (accessor->unlock)
      return accessor->unlock(accessor);
   return EINA_TRUE;
}

typedef struct _Eina_Accessor_CArray_Length Eina_Accessor_CArray_Length;

struct _Eina_Accessor_CArray_Length
{
   Eina_Accessor accessor;

   void** array;

   void** end;
   unsigned int step;
};

static Eina_Bool
eina_carray_length_accessor_get_at(Eina_Accessor_CArray_Length *accessor, unsigned int idx, void **data)
{
   if (accessor->array + idx*accessor->step >= accessor->end)
     return EINA_FALSE;

   memcpy(data, (void*) accessor->array + idx*accessor->step, accessor->step);

   return EINA_TRUE;
}
static Eina_Bool
eina_carray_length_accessor_ptr_get_at(Eina_Accessor_CArray_Length *accessor, unsigned int idx, void **data)
{
   if (accessor->array + idx*accessor->step >= accessor->end)
     return EINA_FALSE;

   *data = (((void*)accessor->array) + idx*accessor->step);

   return EINA_TRUE;
}

static void**
eina_carray_length_accessor_get_container(Eina_Accessor_CArray_Length *accessor)
{
   return accessor->array;
}

static void
eina_carray_length_accessor_free(Eina_Accessor_CArray_Length *accessor)
{
   free(accessor);
}

EAPI Eina_Accessor *
eina_carray_length_accessor_new(void** array, unsigned int step, unsigned int length)
{
   Eina_Accessor_CArray_Length *accessor;

   accessor = calloc(1, sizeof (Eina_Accessor_CArray_Length));
   if (!accessor) return NULL;

   EINA_MAGIC_SET(&accessor->accessor, EINA_MAGIC_ACCESSOR);

   accessor->array = array;
   accessor->end = accessor->array + length * step;
   accessor->step = step;

   accessor->accessor.version = EINA_ACCESSOR_VERSION;
   accessor->accessor.get_at = FUNC_ACCESSOR_GET_AT(eina_carray_length_accessor_get_at);
   accessor->accessor.get_container = FUNC_ACCESSOR_GET_CONTAINER(
      eina_carray_length_accessor_get_container);
   accessor->accessor.free = FUNC_ACCESSOR_FREE(eina_carray_length_accessor_free);

   return &accessor->accessor;
}

EAPI Eina_Accessor *
eina_carray_length_ptr_accessor_new(void** array, unsigned int step, unsigned int length)
{
   Eina_Accessor_CArray_Length *accessor;

   accessor = calloc(1, sizeof (Eina_Accessor_CArray_Length));
   if (!accessor) return NULL;

   EINA_MAGIC_SET(&accessor->accessor, EINA_MAGIC_ACCESSOR);

   accessor->array = array;
   accessor->end = accessor->array + length * step;
   accessor->step = step;

   accessor->accessor.version = EINA_ACCESSOR_VERSION;
   accessor->accessor.get_at = FUNC_ACCESSOR_GET_AT(eina_carray_length_accessor_ptr_get_at);
   accessor->accessor.get_container = FUNC_ACCESSOR_GET_CONTAINER(
      eina_carray_length_accessor_get_container);
   accessor->accessor.free = FUNC_ACCESSOR_FREE(eina_carray_length_accessor_free);

   return &accessor->accessor;
}