release/src-rt-6.x.4708/tools/misc/lzma_src/C/LzmaUtil/Lzma86Dec.c

   1 /* Lzma86Dec.c -- LZMA + x86 (BCJ) Filter Decoder
   2 2008-04-07
   3 Igor Pavlov
   4 Public domain */
   5
   6 #include "Lzma86Dec.h"
   7
   8 #include "../Alloc.h"
   9 #include "../Bra.h"
  10 #include "../LzmaDec.h"
  11
  12 #define LZMA86_SIZE_OFFSET (1 + LZMA_PROPS_SIZE)
  13 #define LZMA86_HEADER_SIZE (LZMA86_SIZE_OFFSET + 8)
  14
  15 static void *SzAlloc(void *p, size_t size) { p = p; return MyAlloc(size); }
  16 static void SzFree(void *p, void *address) { p = p; MyFree(address); }
  17 static ISzAlloc g_Alloc = { SzAlloc, SzFree };
  18
  19 SRes Lzma86_GetUnpackSize(const Byte *src, SizeT srcLen, UInt64 *unpackSize)
  20 {
  21   unsigned i;
  22   if (srcLen < LZMA86_HEADER_SIZE)
  23     return SZ_ERROR_INPUT_EOF;
  24   *unpackSize = 0;
  25   for (i = 0; i < sizeof(UInt64); i++)
  26     *unpackSize += ((UInt64)src[LZMA86_SIZE_OFFSET + i]) << (8 * i);
  27   return SZ_OK;
  28 }
  29
  30 SRes Lzma86_Decode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen)
  31 {
  32   SRes res;
  33   int useFilter;
  34   SizeT inSizePure;
  35   ELzmaStatus status;
  36
  37   if (*srcLen < LZMA86_HEADER_SIZE)
  38     return SZ_ERROR_INPUT_EOF;
  39
  40   useFilter = src[0];
  41
  42   if (useFilter > 1)
  43   {
  44     *destLen = 0;
  45     return SZ_ERROR_UNSUPPORTED;
  46   }
  47
  48   inSizePure = *srcLen - LZMA86_HEADER_SIZE;
  49   res = LzmaDecode(dest, destLen, src + LZMA86_HEADER_SIZE, &inSizePure,
  50       src + 1, LZMA_PROPS_SIZE, LZMA_FINISH_ANY, &status, &g_Alloc);
  51   *srcLen = inSizePure + LZMA86_HEADER_SIZE;
  52   if (res != SZ_OK)
  53     return res;
  54   if (useFilter == 1)
  55   {
  56     UInt32 x86State;
  57     x86_Convert_Init(x86State);
  58     x86_Convert(dest, *destLen, 0, &x86State, 0);
  59   }
  60   return SZ_OK;
  61 }