| /* Lzma86Dec.c -- LZMA + x86 (BCJ) Filter Decoder |
| 2008-04-07 |
| Igor Pavlov |
| Public domain */ |
| |
| #include "Lzma86Dec.h" |
| |
| #include "../Alloc.h" |
| #include "../Bra.h" |
| #include "../LzmaDec.h" |
| |
| #define LZMA86_SIZE_OFFSET (1 + LZMA_PROPS_SIZE) |
| #define LZMA86_HEADER_SIZE (LZMA86_SIZE_OFFSET + 8) |
| |
| static void *SzAlloc(void *p, size_t size) { p = p; return MyAlloc(size); } |
| static void SzFree(void *p, void *address) { p = p; MyFree(address); } |
| static ISzAlloc g_Alloc = { SzAlloc, SzFree }; |
| |
| SRes Lzma86_GetUnpackSize(const Byte *src, SizeT srcLen, UInt64 *unpackSize) |
| { |
| unsigned i; |
| if (srcLen < LZMA86_HEADER_SIZE) |
| return SZ_ERROR_INPUT_EOF; |
| *unpackSize = 0; |
| for (i = 0; i < sizeof(UInt64); i++) |
| *unpackSize += ((UInt64)src[LZMA86_SIZE_OFFSET + i]) << (8 * i); |
| return SZ_OK; |
| } |
| |
| SRes Lzma86_Decode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen) |
| { |
| SRes res; |
| int useFilter; |
| SizeT inSizePure; |
| ELzmaStatus status; |
| |
| if (*srcLen < LZMA86_HEADER_SIZE) |
| return SZ_ERROR_INPUT_EOF; |
| |
| useFilter = src[0]; |
| |
| if (useFilter > 1) |
| { |
| *destLen = 0; |
| return SZ_ERROR_UNSUPPORTED; |
| } |
| |
| inSizePure = *srcLen - LZMA86_HEADER_SIZE; |
| res = LzmaDecode(dest, destLen, src + LZMA86_HEADER_SIZE, &inSizePure, |
| src + 1, LZMA_PROPS_SIZE, LZMA_FINISH_ANY, &status, &g_Alloc); |
| *srcLen = inSizePure + LZMA86_HEADER_SIZE; |
| if (res != SZ_OK) |
| return res; |
| if (useFilter == 1) |
| { |
| UInt32 x86State; |
| x86_Convert_Init(x86State); |
| x86_Convert(dest, *destLen, 0, &x86State, 0); |
| } |
| return SZ_OK; |
| } |