Team Fortress 2 Source Code as on 22/4/2020
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/* 7zCrcOpt.c -- CRC32 calculation
2013-11-12 : Igor Pavlov : Public domain */
#include "Precomp.h"
#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; for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++) v = CRC_UPDATE_BYTE_2(v, *p); for (; size >= 4; size -= 4, p += 4) { v ^= *(const UInt32 *)p; v = 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); return v; }
UInt32 MY_FAST_CALL CrcUpdateT8(UInt32 v, const void *data, size_t size, const UInt32 *table) { return CrcUpdateT4(v, data, size, table); }
#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
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