1/* Lzma86Dec.c -- LZMA + x86 (BCJ) Filter Decoder
 22015-11-08 : 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
12static void *SzAlloc(void *p, size_t size) { UNUSED_VAR(p); return MyAlloc(size); }
13static void SzFree(void *p, void *address) { UNUSED_VAR(p); MyFree(address); }
14
15SRes Lzma86_GetUnpackSize(const Byte *src, SizeT srcLen, UInt64 *unpackSize)
16{
17  unsigned i;
18  if (srcLen < LZMA86_HEADER_SIZE)
19    return SZ_ERROR_INPUT_EOF;
20  *unpackSize = 0;
21  for (i = 0; i < sizeof(UInt64); i++)
22    *unpackSize += ((UInt64)src[LZMA86_SIZE_OFFSET + i]) << (8 * i);
23  return SZ_OK;
24}
25
26SRes Lzma86_Decode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen)
27{
28  ISzAlloc g_Alloc = { SzAlloc, SzFree };
29  SRes res;
30  int useFilter;
31  SizeT inSizePure;
32  ELzmaStatus status;
33
34  if (*srcLen < LZMA86_HEADER_SIZE)
35    return SZ_ERROR_INPUT_EOF;
36
37  useFilter = src[0];
38
39  if (useFilter > 1)
40  {
41    *destLen = 0;
42    return SZ_ERROR_UNSUPPORTED;
43  }
44
45  inSizePure = *srcLen - LZMA86_HEADER_SIZE;
46  res = LzmaDecode(dest, destLen, src + LZMA86_HEADER_SIZE, &inSizePure,
47      src + 1, LZMA_PROPS_SIZE, LZMA_FINISH_ANY, &status, &g_Alloc);
48  *srcLen = inSizePure + LZMA86_HEADER_SIZE;
49  if (res != SZ_OK)
50    return res;
51  if (useFilter == 1)
52  {
53    UInt32 x86State;
54    x86_Convert_Init(x86State);
55    x86_Convert(dest, *destLen, 0, &x86State, 0);
56  }
57  return SZ_OK;
58}