diff options
Diffstat (limited to 'src/libs/7zip/win/C/7zCrcOpt.c')
-rw-r--r-- | src/libs/7zip/win/C/7zCrcOpt.c | 40 |
1 files changed, 36 insertions, 4 deletions
diff --git a/src/libs/7zip/win/C/7zCrcOpt.c b/src/libs/7zip/win/C/7zCrcOpt.c index 6c766a209..ce132b5d4 100644 --- a/src/libs/7zip/win/C/7zCrcOpt.c +++ b/src/libs/7zip/win/C/7zCrcOpt.c @@ -1,12 +1,14 @@ -/* 7zCrcOpt.c -- CRC32 calculation : optimized version -2009-11-23 : Igor Pavlov : Public domain */ +/* 7zCrcOpt.c -- CRC32 calculation +2013-11-12 : Igor Pavlov : Public domain */ -#include "CpuArch.h" +#include "Precomp.h" -#ifdef MY_CPU_LE +#include "CpuArch.h" #define CRC_UPDATE_BYTE_2(crc, b) (table[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8)) +#ifndef MY_CPU_BE + UInt32 MY_FAST_CALL CrcUpdateT4(UInt32 v, const void *data, size_t size, const UInt32 *table) { const Byte *p = (const Byte *)data; @@ -32,3 +34,33 @@ UInt32 MY_FAST_CALL CrcUpdateT8(UInt32 v, const void *data, size_t size, const U } #endif + + +#ifndef MY_CPU_LE + +#define CRC_UINT32_SWAP(v) ((v >> 24) | ((v >> 8) & 0xFF00) | ((v << 8) & 0xFF0000) | (v << 24)) + +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; + 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 -= 0x100; + v = CRC_UINT32_SWAP(v); + for (; size > 0; size--, p++) + v = CRC_UPDATE_BYTE_2(v, *p); + return v; +} + +#endif |