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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <zlib.h>
#ifdef ENABLE_LIBLZ4
#include <lz4.h>
#include <lz4hc.h>
#else
#include "lz4.h"
#include "lz4hc.h"
#endif
#include <Eina.h>
#include "Emile.h"
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;
}
}
EMILE_API Eina_Binbuf *
emile_compress(const Eina_Binbuf *data,
Emile_Compressor_Type t,
Emile_Compressor_Level l)
{
void *compact, *temp;
int length;
int level = l;
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_default
((const char *)eina_binbuf_string_get(data), compact,
eina_binbuf_length_get(data), length);
/* It is going to be smaller and should never fail, if it does you are in deep poo. */
temp = realloc(compact, length);
if (temp) compact = temp;
if (length > 0)
ok = EINA_TRUE;
break;
case EMILE_LZ4HC:
length = LZ4_compress_HC
((const char *)eina_binbuf_string_get(data), compact,
eina_binbuf_length_get(data), length, 16);
temp = realloc(compact, length);
if (temp) compact = temp;
if (length > 0)
ok = EINA_TRUE;
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(compact, length, EINA_FALSE);
}
EMILE_API Eina_Bool
emile_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_decompress_safe((const char *)eina_binbuf_string_get(in),
(char *)eina_binbuf_string_get(out),
eina_binbuf_length_get(in),
eina_binbuf_length_get(out));
if ((unsigned int)ret != eina_binbuf_length_get(out))
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;
}
EMILE_API Eina_Binbuf *
emile_decompress(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(expanded, dest_length, EINA_FALSE);
if (!out)
goto on_error;
if (!emile_expand(data, out, t))
goto on_error;
return out;
on_error:
if (!out)
free(expanded);
if (out)
eina_binbuf_free(out);
return NULL;
}
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