diff options
Diffstat (limited to '3rdparty/lzma/C/7zCrcOpt.c')
-rw-r--r-- | 3rdparty/lzma/C/7zCrcOpt.c | 87 |
1 files changed, 69 insertions, 18 deletions
diff --git a/3rdparty/lzma/C/7zCrcOpt.c b/3rdparty/lzma/C/7zCrcOpt.c index a8d42a80074..d1e1cd7bae1 100644 --- a/3rdparty/lzma/C/7zCrcOpt.c +++ b/3rdparty/lzma/C/7zCrcOpt.c @@ -1,12 +1,14 @@ /* 7zCrcOpt.c -- CRC32 calculation -2010-12-01 : Igor Pavlov : Public domain */ +2015-03-01 : Igor Pavlov : Public domain */ -#include "CpuArch.h" +#include "Precomp.h" -#define CRC_UPDATE_BYTE_2(crc, b) (table[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8)) +#include "CpuArch.h" #ifndef MY_CPU_BE +#define CRC_UPDATE_BYTE_2(crc, b) (table[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8)) + UInt32 MY_FAST_CALL CrcUpdateT4(UInt32 v, const void *data, size_t size, const UInt32 *table) { const Byte *p = (const Byte *)data; @@ -16,10 +18,10 @@ UInt32 MY_FAST_CALL CrcUpdateT4(UInt32 v, const void *data, size_t size, const U { v ^= *(const UInt32 *)p; v = - table[0x300 + (v & 0xFF)] ^ - table[0x200 + ((v >> 8) & 0xFF)] ^ - table[0x100 + ((v >> 16) & 0xFF)] ^ - table[0x000 + ((v >> 24))]; + table[0x300 + ((v ) & 0xFF)] + ^ table[0x200 + ((v >> 8) & 0xFF)] + ^ table[0x100 + ((v >> 16) & 0xFF)] + ^ table[0x000 + ((v >> 24))]; } for (; size > 0; size--, p++) v = CRC_UPDATE_BYTE_2(v, *p); @@ -28,7 +30,28 @@ UInt32 MY_FAST_CALL CrcUpdateT4(UInt32 v, const void *data, size_t size, const U UInt32 MY_FAST_CALL CrcUpdateT8(UInt32 v, const void *data, size_t size, const UInt32 *table) { - return CrcUpdateT4(v, data, size, table); + const Byte *p = (const Byte *)data; + for (; size > 0 && ((unsigned)(ptrdiff_t)p & 7) != 0; size--, p++) + v = CRC_UPDATE_BYTE_2(v, *p); + for (; size >= 8; size -= 8, p += 8) + { + UInt32 d; + v ^= *(const UInt32 *)p; + v = + table[0x700 + ((v ) & 0xFF)] + ^ table[0x600 + ((v >> 8) & 0xFF)] + ^ table[0x500 + ((v >> 16) & 0xFF)] + ^ table[0x400 + ((v >> 24))]; + d = *((const UInt32 *)p + 1); + v ^= + table[0x300 + ((d ) & 0xFF)] + ^ table[0x200 + ((d >> 8) & 0xFF)] + ^ table[0x100 + ((d >> 16) & 0xFF)] + ^ table[0x000 + ((d >> 24))]; + } + for (; size > 0; size--, p++) + v = CRC_UPDATE_BYTE_2(v, *p); + return v; } #endif @@ -38,27 +61,55 @@ UInt32 MY_FAST_CALL CrcUpdateT8(UInt32 v, const void *data, size_t size, const U #define CRC_UINT32_SWAP(v) ((v >> 24) | ((v >> 8) & 0xFF00) | ((v << 8) & 0xFF0000) | (v << 24)) +#define CRC_UPDATE_BYTE_2_BE(crc, b) (table[(((crc) >> 24) ^ (b))] ^ ((crc) << 8)) + UInt32 MY_FAST_CALL CrcUpdateT1_BeT4(UInt32 v, const void *data, size_t size, const UInt32 *table) { const Byte *p = (const Byte *)data; - for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++) - v = CRC_UPDATE_BYTE_2(v, *p); - v = CRC_UINT32_SWAP(v); table += 0x100; + v = CRC_UINT32_SWAP(v); + for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++) + v = CRC_UPDATE_BYTE_2_BE(v, *p); for (; size >= 4; size -= 4, p += 4) { v ^= *(const UInt32 *)p; v = - table[0x000 + (v & 0xFF)] ^ - table[0x100 + ((v >> 8) & 0xFF)] ^ - table[0x200 + ((v >> 16) & 0xFF)] ^ - table[0x300 + ((v >> 24))]; + table[0x000 + ((v ) & 0xFF)] + ^ table[0x100 + ((v >> 8) & 0xFF)] + ^ table[0x200 + ((v >> 16) & 0xFF)] + ^ table[0x300 + ((v >> 24))]; } - table -= 0x100; + for (; size > 0; size--, p++) + v = CRC_UPDATE_BYTE_2_BE(v, *p); + return CRC_UINT32_SWAP(v); +} + +UInt32 MY_FAST_CALL CrcUpdateT1_BeT8(UInt32 v, const void *data, size_t size, const UInt32 *table) +{ + const Byte *p = (const Byte *)data; + table += 0x100; v = CRC_UINT32_SWAP(v); + for (; size > 0 && ((unsigned)(ptrdiff_t)p & 7) != 0; size--, p++) + v = CRC_UPDATE_BYTE_2_BE(v, *p); + for (; size >= 8; size -= 8, p += 8) + { + UInt32 d; + v ^= *(const UInt32 *)p; + v = + table[0x400 + ((v ) & 0xFF)] + ^ table[0x500 + ((v >> 8) & 0xFF)] + ^ table[0x600 + ((v >> 16) & 0xFF)] + ^ table[0x700 + ((v >> 24))]; + d = *((const UInt32 *)p + 1); + v ^= + table[0x000 + ((d ) & 0xFF)] + ^ table[0x100 + ((d >> 8) & 0xFF)] + ^ table[0x200 + ((d >> 16) & 0xFF)] + ^ table[0x300 + ((d >> 24))]; + } for (; size > 0; size--, p++) - v = CRC_UPDATE_BYTE_2(v, *p); - return v; + v = CRC_UPDATE_BYTE_2_BE(v, *p); + return CRC_UINT32_SWAP(v); } #endif |