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/* Lzma86Dec.c -- LZMA + x86 (BCJ) Filter Decoder

2023-03-03 : Igor Pavlov : Public domain */

#include "Precomp.h"

#include "Lzma86.h"

#include "Alloc.h"

#include "Bra.h"

#include "LzmaDec.h"

SRes Lzma86_GetUnpackSize(const Byte *src, SizeT srcLen, UInt64 *unpackSize)

{

unsigned i;

if (srcLen < LZMA86_HEADER_SIZE)

return SZ_ERROR_INPUT_EOF;

*unpackSize = 0;

for (i = 0; i < sizeof(UInt64); i++)

*unpackSize += ((UInt64)src[LZMA86_SIZE_OFFSET + i]) << (8 * i);

return SZ_OK;

}

SRes Lzma86_Decode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen)

{

SRes res;

int useFilter;

SizeT inSizePure;

ELzmaStatus status;

if (*srcLen < LZMA86_HEADER_SIZE)

return SZ_ERROR_INPUT_EOF;

useFilter = src[0];

if (useFilter > 1)

{

*destLen = 0;

return SZ_ERROR_UNSUPPORTED;

}

inSizePure = *srcLen - LZMA86_HEADER_SIZE;

res = LzmaDecode(dest, destLen, src + LZMA86_HEADER_SIZE, &inSizePure,

src + 1, LZMA_PROPS_SIZE, LZMA_FINISH_ANY, &status, &g_Alloc);

*srcLen = inSizePure + LZMA86_HEADER_SIZE;

if (res != SZ_OK)

return res;

if (useFilter == 1)

{

UInt32 x86State = Z7_BRANCH_CONV_ST_X86_STATE_INIT_VAL;

z7_BranchConvSt_X86_Dec(dest, *destLen, 0, &x86State);

}

return SZ_OK;

}

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