nel/3rdparty/seven_zip/Lzma86Dec.c

   1 /* Lzma86Dec.c -- LZMA + x86 (BCJ) Filter Decoder
   2 2016-05-16 : Igor Pavlov : Public domain */
   3
   4 #include "Precomp.h"
   5
   6 #include "Lzma86.h"
   7
   8 #include "Alloc.h"
   9 #include "Bra.h"
  10 #include "LzmaDec.h"
  11
  12 SRes Lzma86_GetUnpackSize(const Byte *src, SizeT srcLen, UInt64 *unpackSize)
  13 {
  14   unsigned i;
  15   if (srcLen < LZMA86_HEADER_SIZE)
  16     return SZ_ERROR_INPUT_EOF;
  17   *unpackSize = 0;
  18   for (i = 0; i < sizeof(UInt64); i++)
  19     *unpackSize += ((UInt64)src[LZMA86_SIZE_OFFSET + i]) << (8 * i);
  20   return SZ_OK;
  21 }
  22
  23 SRes Lzma86_Decode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen)
  24 {
  25   SRes res;
  26   int useFilter;
  27   SizeT inSizePure;
  28   ELzmaStatus status;
  29
  30   if (*srcLen < LZMA86_HEADER_SIZE)
  31     return SZ_ERROR_INPUT_EOF;
  32
  33   useFilter = src[0];
  34
  35   if (useFilter > 1)
  36   {
  37     *destLen = 0;
  38     return SZ_ERROR_UNSUPPORTED;
  39   }
  40
  41   inSizePure = *srcLen - LZMA86_HEADER_SIZE;
  42   res = LzmaDecode(dest, destLen, src + LZMA86_HEADER_SIZE, &inSizePure,
  43       src + 1, LZMA_PROPS_SIZE, LZMA_FINISH_ANY, &status, &g_Alloc);
  44   *srcLen = inSizePure + LZMA86_HEADER_SIZE;
  45   if (res != SZ_OK)
  46     return res;
  47   if (useFilter == 1)
  48   {
  49     UInt32 x86State;
  50     x86_Convert_Init(x86State);
  51     x86_Convert(dest, *destLen, 0, &x86State, 0);
  52   }
  53   return SZ_OK;
  54 }