| 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 | } |