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718112a8fe
Currently none of these is being used, but eventually they will, once more code gets ported over. So it's better to have them right away and avoid editing the project file too much, only to revert that later.
115 lines
3.3 KiB
C
115 lines
3.3 KiB
C
/* 7zCrcOpt.c -- CRC32 calculation
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2017-04-03 : Igor Pavlov : Public domain */
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#include "Precomp.h"
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#include "CpuArch.h"
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#ifndef MY_CPU_BE
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#define CRC_UPDATE_BYTE_2(crc, b) (table[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8))
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UInt32 MY_FAST_CALL CrcUpdateT4(UInt32 v, const void *data, size_t size, const UInt32 *table)
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{
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const Byte *p = (const Byte *)data;
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for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)
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v = CRC_UPDATE_BYTE_2(v, *p);
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for (; size >= 4; size -= 4, p += 4)
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{
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v ^= *(const UInt32 *)p;
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v =
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(table + 0x300)[((v ) & 0xFF)]
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^ (table + 0x200)[((v >> 8) & 0xFF)]
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^ (table + 0x100)[((v >> 16) & 0xFF)]
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^ (table + 0x000)[((v >> 24))];
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}
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for (; size > 0; size--, p++)
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v = CRC_UPDATE_BYTE_2(v, *p);
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return v;
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}
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UInt32 MY_FAST_CALL CrcUpdateT8(UInt32 v, const void *data, size_t size, const UInt32 *table)
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{
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const Byte *p = (const Byte *)data;
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for (; size > 0 && ((unsigned)(ptrdiff_t)p & 7) != 0; size--, p++)
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v = CRC_UPDATE_BYTE_2(v, *p);
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for (; size >= 8; size -= 8, p += 8)
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{
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UInt32 d;
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v ^= *(const UInt32 *)p;
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v =
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(table + 0x700)[((v ) & 0xFF)]
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^ (table + 0x600)[((v >> 8) & 0xFF)]
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^ (table + 0x500)[((v >> 16) & 0xFF)]
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^ (table + 0x400)[((v >> 24))];
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d = *((const UInt32 *)p + 1);
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v ^=
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(table + 0x300)[((d ) & 0xFF)]
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^ (table + 0x200)[((d >> 8) & 0xFF)]
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^ (table + 0x100)[((d >> 16) & 0xFF)]
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^ (table + 0x000)[((d >> 24))];
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}
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for (; size > 0; size--, p++)
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v = CRC_UPDATE_BYTE_2(v, *p);
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return v;
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}
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#endif
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#ifndef MY_CPU_LE
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#define CRC_UINT32_SWAP(v) ((v >> 24) | ((v >> 8) & 0xFF00) | ((v << 8) & 0xFF0000) | (v << 24))
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#define CRC_UPDATE_BYTE_2_BE(crc, b) (table[(((crc) >> 24) ^ (b))] ^ ((crc) << 8))
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UInt32 MY_FAST_CALL CrcUpdateT1_BeT4(UInt32 v, const void *data, size_t size, const UInt32 *table)
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{
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const Byte *p = (const Byte *)data;
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table += 0x100;
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v = CRC_UINT32_SWAP(v);
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for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)
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v = CRC_UPDATE_BYTE_2_BE(v, *p);
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for (; size >= 4; size -= 4, p += 4)
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{
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v ^= *(const UInt32 *)p;
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v =
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(table + 0x000)[((v ) & 0xFF)]
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^ (table + 0x100)[((v >> 8) & 0xFF)]
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^ (table + 0x200)[((v >> 16) & 0xFF)]
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^ (table + 0x300)[((v >> 24))];
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}
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for (; size > 0; size--, p++)
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v = CRC_UPDATE_BYTE_2_BE(v, *p);
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return CRC_UINT32_SWAP(v);
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}
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UInt32 MY_FAST_CALL CrcUpdateT1_BeT8(UInt32 v, const void *data, size_t size, const UInt32 *table)
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{
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const Byte *p = (const Byte *)data;
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table += 0x100;
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v = CRC_UINT32_SWAP(v);
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for (; size > 0 && ((unsigned)(ptrdiff_t)p & 7) != 0; size--, p++)
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v = CRC_UPDATE_BYTE_2_BE(v, *p);
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for (; size >= 8; size -= 8, p += 8)
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{
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UInt32 d;
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v ^= *(const UInt32 *)p;
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v =
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(table + 0x400)[((v ) & 0xFF)]
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^ (table + 0x500)[((v >> 8) & 0xFF)]
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^ (table + 0x600)[((v >> 16) & 0xFF)]
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^ (table + 0x700)[((v >> 24))];
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d = *((const UInt32 *)p + 1);
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v ^=
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(table + 0x000)[((d ) & 0xFF)]
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^ (table + 0x100)[((d >> 8) & 0xFF)]
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^ (table + 0x200)[((d >> 16) & 0xFF)]
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^ (table + 0x300)[((d >> 24))];
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}
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for (; size > 0; size--, p++)
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v = CRC_UPDATE_BYTE_2_BE(v, *p);
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return CRC_UINT32_SWAP(v);
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}
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#endif
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