diff options
Diffstat (limited to 'src/libs/7zip/win/C/7zCrc.c')
-rw-r--r-- | src/libs/7zip/win/C/7zCrc.c | 69 |
1 files changed, 40 insertions, 29 deletions
diff --git a/src/libs/7zip/win/C/7zCrc.c b/src/libs/7zip/win/C/7zCrc.c index a92084961..5f32380dd 100644 --- a/src/libs/7zip/win/C/7zCrc.c +++ b/src/libs/7zip/win/C/7zCrc.c @@ -1,41 +1,33 @@ -/* 7zCrc.c -- CRC32 calculation -2009-11-23 : Igor Pavlov : Public domain */ +/* 7zCrc.c -- CRC32 init +2013-11-12 : Igor Pavlov : Public domain */ + +#include "Precomp.h" #include "7zCrc.h" #include "CpuArch.h" #define kCrcPoly 0xEDB88320 -#ifdef MY_CPU_LE -#define CRC_NUM_TABLES 8 +#ifdef MY_CPU_X86_OR_AMD64 + #define CRC_NUM_TABLES 8 + UInt32 MY_FAST_CALL CrcUpdateT8(UInt32 v, const void *data, size_t size, const UInt32 *table); +#elif defined(MY_CPU_LE) + #define CRC_NUM_TABLES 4 #else -#define CRC_NUM_TABLES 1 + #define CRC_NUM_TABLES 5 + #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); +#endif + +#ifndef MY_CPU_BE + UInt32 MY_FAST_CALL CrcUpdateT4(UInt32 v, const void *data, size_t size, const UInt32 *table); #endif typedef UInt32 (MY_FAST_CALL *CRC_FUNC)(UInt32 v, const void *data, size_t size, const UInt32 *table); -static CRC_FUNC g_CrcUpdate; +CRC_FUNC g_CrcUpdate; UInt32 g_CrcTable[256 * CRC_NUM_TABLES]; -#if CRC_NUM_TABLES == 1 - -#define CRC_UPDATE_BYTE_2(crc, b) (table[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8)) - -static UInt32 MY_FAST_CALL CrcUpdateT1(UInt32 v, const void *data, size_t size, const UInt32 *table) -{ - const Byte *p = (const Byte *)data; - for (; size > 0; size--, p++) - v = CRC_UPDATE_BYTE_2(v, *p); - return v; -} - -#else - -UInt32 MY_FAST_CALL CrcUpdateT4(UInt32 v, const void *data, size_t size, const UInt32 *table); -UInt32 MY_FAST_CALL CrcUpdateT8(UInt32 v, const void *data, size_t size, const UInt32 *table); - -#endif - UInt32 MY_FAST_CALL CrcUpdate(UInt32 v, const void *data, size_t size) { return g_CrcUpdate(v, data, size, g_CrcTable); @@ -57,18 +49,37 @@ void MY_FAST_CALL CrcGenerateTable() r = (r >> 1) ^ (kCrcPoly & ~((r & 1) - 1)); g_CrcTable[i] = r; } - #if CRC_NUM_TABLES == 1 - g_CrcUpdate = CrcUpdateT1; - #else for (; i < 256 * CRC_NUM_TABLES; i++) { UInt32 r = g_CrcTable[i - 256]; g_CrcTable[i] = g_CrcTable[r & 0xFF] ^ (r >> 8); } + + #ifdef MY_CPU_LE + g_CrcUpdate = CrcUpdateT4; - #ifdef MY_CPU_X86_OR_AMD64 + + #if CRC_NUM_TABLES == 8 if (!CPU_Is_InOrder()) g_CrcUpdate = CrcUpdateT8; #endif + + #else + { + #ifndef MY_CPU_BE + UInt32 k = 1; + if (*(const Byte *)&k == 1) + g_CrcUpdate = CrcUpdateT4; + else + #endif + { + for (i = 256 * CRC_NUM_TABLES - 1; i >= 256; i--) + { + UInt32 x = g_CrcTable[i - 256]; + g_CrcTable[i] = CRC_UINT32_SWAP(x); + } + g_CrcUpdate = CrcUpdateT1_BeT4; + } + } #endif } |