b24e7fce |
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 | |
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 | |
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 | } |