Subversion Repositories spk

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

2008-04-07

Igor Pavlov

Public domain */

#include "Lzma86Dec.h"

#include "Alloc.h"

#include "Bra.h"

#include "LzmaDec.h"

#define LZMA86_SIZE_OFFSET (1 + LZMA_PROPS_SIZE)

#define LZMA86_HEADER_SIZE (LZMA86_SIZE_OFFSET + 8)

static void *SzAlloc(void *p, size_t size) { p = p; return MyAlloc(size); }

static void SzFree(void *p, void *address) { p = p; MyFree(address); }

static ISzAlloc g_Alloc = { SzAlloc, SzFree };

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;

    x86_Convert_Init(x86State);

    x86_Convert(dest, *destLen, 0, &x86State, 0);

  }

  return SZ_OK;

}