emile: add compress/uncompress logic.

src/Makefile_Emile.am

@@ -9,19 +9,40 @@ dist_installed_emilemainheaders_DATA = lib/emile/Emile.h
 lib_emile_libemile_la_SOURCES = \
 lib/emile/emile_private.h \
 lib/emile/emile_main.c \
-lib/emile/emile_cipher.c
+lib/emile/emile_compress.c
+
+if ! ENABLE_LIBLZ4
+lib_emile_libemile_la_SOURCES += \
+static_libs/lz4/lz4.c \
+static_libs/lz4/lz4.h \
+static_libs/lz4/lz4hc.c \
+static_libs/lz4/lz4hc.h
+endif
 
 lib_emile_libemile_la_CPPFLAGS = -I$(top_builddir)/src/lib/efl \
--I$(top_srcdir)/src/static_libs/lz4 \
 -DPACKAGE_BIN_DIR=\"$(bindir)\" \
 -DPACKAGE_LIB_DIR=\"$(libdir)\" \
 -DPACKAGE_DATA_DIR=\"$(datadir)/emile\" \
 @EMILE_CFLAGS@
+
+if ! ENABLE_LIBLZ4
+lib_emile_libemile_la_CPPFLAGS += \
+-I$(top_srcdir)/src/static_libs/lz4
+endif
+
 lib_emile_libemile_la_LIBADD = @EMILE_LIBS@
 lib_emile_libemile_la_DEPENDENCIES = @EMILE_INTERNAL_LIBS@
 lib_emile_libemile_la_LDFLAGS = @EFL_LTLIBRARY_FLAGS@
 
-EXTRA_DIST += static_libs/lz4/README
+if ! ENABLE_LIBLZ4
+lib_emile_libemile_la_LIBADD += @LIBLZ4_LIBS@
+endif
+
+EXTRA_DIST += static_libs/lz4/README \
+static_libs/lz4/lz4.c \
+static_libs/lz4/lz4.h \
+static_libs/lz4/lz4hc.c \
+static_libs/lz4/lz4hc.h
 
 ### Binary
 

src/lib/emile/Emile.h

@@ -112,6 +112,30 @@ EAPI Eina_Binbuf *emile_binbuf_cipher(const Eina_Binbuf *in,
 EAPI Eina_Binbuf *emile_binbuf_decipher(const Eina_Binbuf *in,
                                         const char *key, unsigned int length);
 
+typedef enum
+{
+  EMILE_ZLIB,
+  EMILE_LZ4,
+  EMILE_LZ4HC
+} Emile_Compressor_Type;
+
+typedef enum
+{
+  EMILE_DEFAULT = -1,
+  EMILE_NO_COMPRESSION = 0,
+  EMILE_FAST_COMPRESSION = 1,
+  EMILE_BEST_COMPRESSION = 9
+} Emile_Compressor_Level;
+
+EAPI Eina_Binbuf *emile_binbuf_compress(const Eina_Binbuf *in,
+                                        Emile_Compressor_Type t, int level);
+EAPI Eina_Binbuf *emile_binbuf_uncompress(const Eina_Binbuf *in,
+                                          Emile_Compressor_Type t,
+                                          unsigned int dest_length);
+EAPI Eina_Bool emile_binbuf_expand(const Eina_Binbuf *in,
+                                   Eina_Binbuf *out,
+                                   Emile_Compressor_Type t);
+
 #ifdef __cplusplus
 }
 #endif /* ifdef __cplusplus */

src/lib/emile/emile_compress.c

@@ -0,0 +1,136 @@
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif /* ifdef HAVE_CONFIG_H */
+
+#include <zlib.h>
+
+#include <Eina.h>
+#include "Emile.h"
+
+#ifdef ENABLE_LIBLZ4
+# include <lz4.h>
+# include <lz4hc.h>
+#else
+# include "lz4.h"
+# include "lz4hc.h"
+#endif
+
+static int
+emile_compress_buffer_size(const Eina_Binbuf *data, Emile_Compressor_Type t)
+{
+   switch (t)
+     {
+      case EMILE_ZLIB:
+         return 12 + ((eina_binbuf_length_get(data) * 101) / 100);
+      case EMILE_LZ4:
+      case EMILE_LZ4HC:
+         return LZ4_compressBound(eina_binbuf_length_get(data));
+      default:
+         return -1;
+     }
+}
+
+EAPI Eina_Binbuf *
+emile_binbuf_compress(const Eina_Binbuf *data, Emile_Compressor_Type t, int level)
+{
+   void *compact;
+   int length;
+   Eina_Bool ok = EINA_FALSE;
+
+   length = emile_compress_buffer_size(data, t);
+
+   compact = malloc(length);
+   if (!compact) return NULL;
+
+   switch (t)
+     {
+      case EMILE_LZ4:
+         length = LZ4_compress((const char *) eina_binbuf_string_get(data), compact, eina_binbuf_length_get(data));
+         if (length > 0) ok = EINA_TRUE;
+         compact = realloc(compact, length); // It is going to be smaller and should never fail, if it does you are in deep poo.
+         break;
+      case EMILE_LZ4HC:
+         length = LZ4_compressHC((const char *) eina_binbuf_string_get(data), compact, eina_binbuf_length_get(data));
+         if (length > 0) ok = EINA_TRUE;
+         compact = realloc(compact, length);
+         break;
+      case EMILE_ZLIB:
+        {
+           uLongf buflen = (uLongf) length;
+
+           if (compress2((Bytef *)compact, &buflen, (Bytef *) eina_binbuf_string_get(data),
+                         (uLong) eina_binbuf_length_get(data), level) == Z_OK)
+             ok = EINA_TRUE;
+           length = (int) buflen;
+        }
+     }
+
+   if (!ok)
+     {
+        free(compact);
+        return NULL;
+     }
+
+   return eina_binbuf_manage_new_length(compact, length);
+}
+
+EAPI Eina_Bool
+emile_binbuf_expand(const Eina_Binbuf *in,
+                    Eina_Binbuf *out,
+                    Emile_Compressor_Type t)
+{
+   if (!in || !out) return EINA_FALSE;
+
+   switch (t)
+     {
+      case EMILE_LZ4:
+      case EMILE_LZ4HC:
+        {
+           int ret;
+
+           ret = LZ4_uncompress((const char*) eina_binbuf_string_get(in),
+                                (char*) eina_binbuf_string_get(out),
+                                eina_binbuf_length_get(out));
+           if ((unsigned int) ret != eina_binbuf_length_get(in))
+             return EINA_FALSE;
+           break;
+        }
+      case EMILE_ZLIB:
+        {
+           uLongf dlen = eina_binbuf_length_get(out);
+
+           if (uncompress((Bytef *) eina_binbuf_string_get(out), &dlen,
+                          eina_binbuf_string_get(in),
+                          (uLongf) eina_binbuf_length_get(in)) != Z_OK)
+             return EINA_FALSE;
+           break;
+        }
+      default:
+         return EINA_FALSE;
+     }
+
+   return EINA_TRUE;
+}
+
+EAPI Eina_Binbuf *
+emile_binbuf_uncompress(const Eina_Binbuf *data, Emile_Compressor_Type t, unsigned int dest_length)
+{
+   Eina_Binbuf *out;
+   void *expanded;
+
+   expanded = malloc(dest_length);
+   if (!expanded) return NULL;
+
+   out = eina_binbuf_manage_new_length(expanded, dest_length);
+   if (!out) goto on_error;
+
+   if (!emile_binbuf_expand(data, out, t))
+     goto on_error;
+
+   return out;
+
+ on_error:
+   if (!out) free(expanded);
+   if (out) eina_binbuf_free(out);
+   return NULL;
+}