| repo sync | baa3858 | 2013-07-26 17:53:31 -0700 | [diff] [blame] | 1 | /* XzCrc64.c -- CRC64 calculation
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| 2 | 2010-04-16 : Igor Pavlov : Public domain */
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| 3 |
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| 4 | #include "XzCrc64.h"
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| 5 |
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| 6 | #define kCrc64Poly UINT64_CONST(0xC96C5795D7870F42)
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| 7 | UInt64 g_Crc64Table[256];
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| 8 |
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| 9 | void MY_FAST_CALL Crc64GenerateTable(void)
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| 10 | {
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| 11 | UInt32 i;
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| 12 | for (i = 0; i < 256; i++)
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| 13 | {
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| 14 | UInt64 r = i;
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| 15 | int j;
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| 16 | for (j = 0; j < 8; j++)
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| 17 | r = (r >> 1) ^ ((UInt64)kCrc64Poly & ~((r & 1) - 1));
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| 18 | g_Crc64Table[i] = r;
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| 19 | }
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| 20 | }
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| 21 |
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| 22 | UInt64 MY_FAST_CALL Crc64Update(UInt64 v, const void *data, size_t size)
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| 23 | {
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| 24 | const Byte *p = (const Byte *)data;
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| 25 | for (; size > 0 ; size--, p++)
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| 26 | v = CRC64_UPDATE_BYTE(v, *p);
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| 27 | return v;
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| 28 | }
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| 29 |
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| 30 | UInt64 MY_FAST_CALL Crc64Calc(const void *data, size_t size)
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| 31 | {
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| 32 | return CRC64_GET_DIGEST(Crc64Update(CRC64_INIT_VAL, data, size));
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| 33 | }
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