1 /* Lzma86Dec.c -- LZMA + x86 (BCJ) Filter Decoder 2 2009-08-14 : Igor Pavlov : Public domain */ 3 4 #include "Lzma86.h" 5 6 #include "Alloc.h" 7 #include "Bra.h" 8 #include "LzmaDec.h" 9 10 static void *SzAlloc(void *p, size_t size) { p = p; return MyAlloc(size); } 11 static void SzFree(void *p, void *address) { p = p; MyFree(address); } 12 13 SRes 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 24 SRes 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
