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
Lzma86_GetUnpackSize(const Byte * src,SizeT srcLen,UInt64 * unpackSize)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
Lzma86_Decode(Byte * dest,SizeT * destLen,const Byte * src,SizeT * srcLen)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 }
55