109 lines
2.7 KiB
C
109 lines
2.7 KiB
C
/* Lzma86Enc.c -- LZMA + x86 (BCJ) Filter Encoder
|
|
2009-08-14 : Igor Pavlov : Public domain */
|
|
|
|
#include <string.h>
|
|
|
|
#include "Lzma86.h"
|
|
|
|
#include "Alloc.h"
|
|
#include "Bra.h"
|
|
#include "LzmaEnc.h"
|
|
|
|
#define SZE_OUT_OVERFLOW SZE_DATA_ERROR
|
|
|
|
static void *SzAlloc(void *p, size_t size) { p = p; return MyAlloc(size); }
|
|
static void SzFree(void *p, void *address) { p = p; MyFree(address); }
|
|
|
|
int Lzma86_Encode(Byte *dest, size_t *destLen, const Byte *src, size_t srcLen,
|
|
int level, UInt32 dictSize, int filterMode)
|
|
{
|
|
ISzAlloc g_Alloc = { SzAlloc, SzFree };
|
|
size_t outSize2 = *destLen;
|
|
Byte *filteredStream;
|
|
Bool useFilter;
|
|
int mainResult = SZ_ERROR_OUTPUT_EOF;
|
|
CLzmaEncProps props;
|
|
LzmaEncProps_Init(&props);
|
|
props.level = level;
|
|
props.dictSize = dictSize;
|
|
|
|
*destLen = 0;
|
|
if (outSize2 < LZMA86_HEADER_SIZE)
|
|
return SZ_ERROR_OUTPUT_EOF;
|
|
|
|
{
|
|
int i;
|
|
UInt64 t = srcLen;
|
|
for (i = 0; i < 8; i++, t >>= 8)
|
|
dest[LZMA86_SIZE_OFFSET + i] = (Byte)t;
|
|
}
|
|
|
|
filteredStream = 0;
|
|
useFilter = (filterMode != SZ_FILTER_NO);
|
|
if (useFilter)
|
|
{
|
|
if (srcLen != 0)
|
|
{
|
|
filteredStream = (Byte *)MyAlloc(srcLen);
|
|
if (filteredStream == 0)
|
|
return SZ_ERROR_MEM;
|
|
memcpy(filteredStream, src, srcLen);
|
|
}
|
|
{
|
|
UInt32 x86State;
|
|
x86_Convert_Init(x86State);
|
|
x86_Convert(filteredStream, srcLen, 0, &x86State, 1);
|
|
}
|
|
}
|
|
|
|
{
|
|
size_t minSize = 0;
|
|
Bool bestIsFiltered = False;
|
|
|
|
/* passes for SZ_FILTER_AUTO:
|
|
0 - BCJ + LZMA
|
|
1 - LZMA
|
|
2 - BCJ + LZMA agaian, if pass 0 (BCJ + LZMA) is better.
|
|
*/
|
|
int numPasses = (filterMode == SZ_FILTER_AUTO) ? 3 : 1;
|
|
|
|
int i;
|
|
for (i = 0; i < numPasses; i++)
|
|
{
|
|
size_t outSizeProcessed = outSize2 - LZMA86_HEADER_SIZE;
|
|
size_t outPropsSize = 5;
|
|
SRes curRes;
|
|
Bool curModeIsFiltered = (numPasses > 1 && i == numPasses - 1);
|
|
if (curModeIsFiltered && !bestIsFiltered)
|
|
break;
|
|
if (useFilter && i == 0)
|
|
curModeIsFiltered = True;
|
|
|
|
curRes = LzmaEncode(dest + LZMA86_HEADER_SIZE, &outSizeProcessed,
|
|
curModeIsFiltered ? filteredStream : src, srcLen,
|
|
&props, dest + 1, &outPropsSize, 0,
|
|
NULL, &g_Alloc, &g_Alloc);
|
|
|
|
if (curRes != SZ_ERROR_OUTPUT_EOF)
|
|
{
|
|
if (curRes != SZ_OK)
|
|
{
|
|
mainResult = curRes;
|
|
break;
|
|
}
|
|
if (outSizeProcessed <= minSize || mainResult != SZ_OK)
|
|
{
|
|
minSize = outSizeProcessed;
|
|
bestIsFiltered = curModeIsFiltered;
|
|
mainResult = SZ_OK;
|
|
}
|
|
}
|
|
}
|
|
dest[0] = (bestIsFiltered ? 1 : 0);
|
|
*destLen = LZMA86_HEADER_SIZE + minSize;
|
|
}
|
|
if (useFilter)
|
|
MyFree(filteredStream);
|
|
return mainResult;
|
|
}
|