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}
57