1/* Lzma86Dec.c -- LZMA + x86 (BCJ) Filter Decoder
 22009-08-14 : Igor Pavlov : Public domain */
 3
 4#include "Lzma86.h"
 5
 6#include "Alloc.h"
 7#include "Bra.h"
 8#include "LzmaDec.h"
 9
10static void *SzAlloc(void *p, size_t size) { p = p; return MyAlloc(size); }
11static void SzFree(void *p, void *address) { p = p; MyFree(address); }
12
13SRes Lzma86_GetUnpackSize(const Byte *src, SizeT srcLen, UInt64 *unpackSize)
14{
15  unsigned i;
16  if (srcLen < LZMA86_HEADER_SIZE)
17    return SZ_ERROR_INPUT_EOF;
18  *unpackSize = 0;
19  for (i = 0; i < sizeof(UInt64); i++)
20    *unpackSize += ((UInt64)src[LZMA86_SIZE_OFFSET + i]) << (8 * i);
21  return SZ_OK;
22}
23
24SRes Lzma86_Decode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen)
25{
26  ISzAlloc g_Alloc = { SzAlloc, SzFree };
27  SRes res;
28  int useFilter;
29  SizeT inSizePure;
30  ELzmaStatus status;
31
32  if (*srcLen < LZMA86_HEADER_SIZE)
33    return SZ_ERROR_INPUT_EOF;
34
35  useFilter = src[0];
36
37  if (useFilter > 1)
38  {
39    *destLen = 0;
40    return SZ_ERROR_UNSUPPORTED;
41  }
42
43  inSizePure = *srcLen - LZMA86_HEADER_SIZE;
44  res = LzmaDecode(dest, destLen, src + LZMA86_HEADER_SIZE, &inSizePure,
45      src + 1, LZMA_PROPS_SIZE, LZMA_FINISH_ANY, &status, &g_Alloc);
46  *srcLen = inSizePure + LZMA86_HEADER_SIZE;
47  if (res != SZ_OK)
48    return res;
49  if (useFilter == 1)
50  {
51    UInt32 x86State;
52    x86_Convert_Init(x86State);
53    x86_Convert(dest, *destLen, 0, &x86State, 0);
54  }
55  return SZ_OK;
56}