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Rev | Author | Line No. | Line |
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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 | }8;> |