116 lines
3.2 KiB
C
116 lines
3.2 KiB
C
/* 7zCrcOpt.c -- CRC32 calculation
|
|
2015-03-01 : Igor Pavlov : Public domain */
|
|
|
|
#include "Precomp.h"
|
|
|
|
#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;
|
|
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)
|
|
{
|
|
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
|
|
|
|
|
|
#ifndef MY_CPU_LE
|
|
|
|
#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;
|
|
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))];
|
|
}
|
|
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_BE(v, *p);
|
|
return CRC_UINT32_SWAP(v);
|
|
}
|
|
|
|
#endif
|