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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1805 | yogev_ezra | 1 | #include "kosSyst.h" |
| 2 | #include "CRC32.h" |
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| 3 | |||
| 4 | |||
| 5 | |||
| 6 | CCRC32::CCRC32() |
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| 7 | { |
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| 8 | Dword i, mask, j, k; |
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| 9 | |||
| 10 | for ( i=0xEDB8; i >= 0x8320; i-- ) |
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| 11 | { |
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| 12 | mask = i; |
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| 13 | for ( j=0; j<8; j++ ) |
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| 14 | { |
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| 15 | k = mask; |
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| 16 | mask >>= 1; |
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| 17 | if ( k & 1 ) |
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| 18 | { |
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| 19 | mask ^= 0xEDB88320; |
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| 20 | } |
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| 21 | this->table[i & 0xFF] = mask; |
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| 22 | } |
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| 23 | } |
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| 24 | } |
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| 25 | |||
| 26 | |||
| 27 | Dword CCRC32::InitCRC32() |
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| 28 | { |
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| 29 | return 0xFFFFFFFF; |
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| 30 | } |
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| 31 | |||
| 32 | |||
| 33 | Dword CCRC32::FinalizeCRC32(Dword d) |
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| 34 | { |
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| 35 | return ~d; |
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| 36 | } |
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| 37 | |||
| 38 | |||
| 39 | void CCRC32::DoCRC32(Byte *buffer, Dword length, Dword *CRC32value) |
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| 40 | { |
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| 41 | Dword result, i; |
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| 42 | Byte mask; |
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| 43 | |||
| 44 | result = *CRC32value; |
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| 45 | |||
| 46 | for ( i=0; i |
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| 47 | { |
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| 48 | mask = (Byte)( ( result ^ buffer[i] ) & 0xFF ); |
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| 49 | result = ( result >>= 8 ) ^ this->table[mask]; |
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| 50 | } |
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| 51 | *CRC32value = result; |
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| 52 | } |
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| 53 | |||
| 54 | |||
| 55 | Dword CCRC32::GetCRC32(Byte *buffer, Dword length) |
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| 56 | { |
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| 57 | Dword result; |
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| 58 | |||
| 59 | result = 0xFFFFFFFF; |
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| 60 | |||
| 61 | this->DoCRC32( buffer, length, &result ); |
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| 62 | |||
| 63 | return ~result; |
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| 64 | } |