107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
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/* Lzma86Enc.c -- LZMA + x86 (BCJ) Filter Encoder
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2016-05-16 : Igor Pavlov : Public domain */
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#include "Precomp.h"
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#include <string.h>
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#include "Lzma86.h"
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#include "Alloc.h"
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#include "Bra.h"
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#include "LzmaEnc.h"
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#define SZE_OUT_OVERFLOW SZE_DATA_ERROR
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int Lzma86_Encode(Byte *dest, size_t *destLen, const Byte *src, size_t srcLen,
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int level, UInt32 dictSize, int filterMode)
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{
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size_t outSize2 = *destLen;
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Byte *filteredStream;
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Bool useFilter;
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int mainResult = SZ_ERROR_OUTPUT_EOF;
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CLzmaEncProps props;
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LzmaEncProps_Init(&props);
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props.level = level;
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props.dictSize = dictSize;
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*destLen = 0;
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if (outSize2 < LZMA86_HEADER_SIZE)
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return SZ_ERROR_OUTPUT_EOF;
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{
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int i;
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UInt64 t = srcLen;
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for (i = 0; i < 8; i++, t >>= 8)
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dest[LZMA86_SIZE_OFFSET + i] = (Byte)t;
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}
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filteredStream = 0;
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useFilter = (filterMode != SZ_FILTER_NO);
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if (useFilter)
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{
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if (srcLen != 0)
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{
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filteredStream = (Byte *)MyAlloc(srcLen);
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if (filteredStream == 0)
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return SZ_ERROR_MEM;
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memcpy(filteredStream, src, srcLen);
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}
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{
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UInt32 x86State;
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x86_Convert_Init(x86State);
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x86_Convert(filteredStream, srcLen, 0, &x86State, 1);
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}
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}
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{
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size_t minSize = 0;
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Bool bestIsFiltered = False;
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/* passes for SZ_FILTER_AUTO:
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0 - BCJ + LZMA
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1 - LZMA
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2 - BCJ + LZMA agaian, if pass 0 (BCJ + LZMA) is better.
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*/
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int numPasses = (filterMode == SZ_FILTER_AUTO) ? 3 : 1;
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int i;
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for (i = 0; i < numPasses; i++)
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{
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size_t outSizeProcessed = outSize2 - LZMA86_HEADER_SIZE;
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size_t outPropsSize = 5;
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SRes curRes;
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Bool curModeIsFiltered = (numPasses > 1 && i == numPasses - 1);
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if (curModeIsFiltered && !bestIsFiltered)
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break;
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if (useFilter && i == 0)
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curModeIsFiltered = True;
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curRes = LzmaEncode(dest + LZMA86_HEADER_SIZE, &outSizeProcessed,
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curModeIsFiltered ? filteredStream : src, srcLen,
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&props, dest + 1, &outPropsSize, 0,
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NULL, &g_Alloc, &g_Alloc);
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if (curRes != SZ_ERROR_OUTPUT_EOF)
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{
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if (curRes != SZ_OK)
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{
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mainResult = curRes;
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break;
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}
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if (outSizeProcessed <= minSize || mainResult != SZ_OK)
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{
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minSize = outSizeProcessed;
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bestIsFiltered = curModeIsFiltered;
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mainResult = SZ_OK;
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}
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}
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}
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dest[0] = (Byte)(bestIsFiltered ? 1 : 0);
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*destLen = LZMA86_HEADER_SIZE + minSize;
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}
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if (useFilter)
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MyFree(filteredStream);
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return mainResult;
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}
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