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Пример вычисления контрольной суммы (CRC32)



Автор: Vit
WEB сайт: http://forum.vingrad.ru

function CRC32(const IniCRC:Integer;Source:AnsiString):Integer;
asm
 Push EBX
 Push ESI
 Push EDI
 Or EDX,EDX
 Jz @Done
 Mov ESI,EDX
 Mov ECX,[EDX-4]
 Jecxz @Done
 Lea EDI,@CRCTbl
 Mov EDX,EAX
 Xor EAX,EAX
 Cld
 @L1:
 Lodsb
 Mov EBX,EDX
 Xor EBX,EAX
 And EBX,$FF
 Shl EBX,2
 Shr EDX,8
 And EDX,$FFFFFF
 Xor EDX,[EDI+EBX]
 Dec ECX
 Jnz @L1
 Mov EAX,EDX
 @Done:
 Pop EDI
 Pop ESI
 Pop EBX
 Ret
 @CRCTbl:
 DD $00000000, $77073096, $ee0e612c, $990951ba
 DD $076dc419, $706af48f, $e963a535, $9e6495a3
 DD $0edb8832, $79dcb8a4, $e0d5e91e, $97d2d988
 DD $09b64c2b, $7eb17cbd, $e7b82d07, $90bf1d91
 DD $1db71064, $6ab020f2, $f3b97148, $84be41de
 DD $1adad47d, $6ddde4eb, $f4d4b551, $83d385c7
 DD $136c9856, $646ba8c0, $fd62f97a, $8a65c9ec
 DD $14015c4f, $63066cd9, $fa0f3d63, $8d080df5
 DD $3b6e20c8, $4c69105e, $d56041e4, $a2677172
 DD $3c03e4d1, $4b04d447, $d20d85fd, $a50ab56b
 DD $35b5a8fa, $42b2986c, $dbbbc9d6, $acbcf940
 DD $32d86ce3, $45df5c75, $dcd60dcf, $abd13d59
 DD $26d930ac, $51de003a, $c8d75180, $bfd06116
 DD $21b4f4b5, $56b3c423, $cfba9599, $b8bda50f
 DD $2802b89e, $5f058808, $c60cd9b2, $b10be924
 DD $2f6f7c87, $58684c11, $c1611dab, $b6662d3d
 DD $76dc4190, $01db7106, $98d220bc, $efd5102a
 DD $71b18589, $06b6b51f, $9fbfe4a5, $e8b8d433
 DD $7807c9a2, $0f00f934, $9609a88e, $e10e9818
 DD $7f6a0dbb, $086d3d2d, $91646c97, $e6635c01
 DD $6b6b51f4, $1c6c6162, $856530d8, $f262004e
 DD $6c0695ed, $1b01a57b, $8208f4c1, $f50fc457
 DD $65b0d9c6, $12b7e950, $8bbeb8ea, $fcb9887c
 DD $62dd1ddf, $15da2d49, $8cd37cf3, $fbd44c65
 DD $4db26158, $3ab551ce, $a3bc0074, $d4bb30e2
 DD $4adfa541, $3dd895d7, $a4d1c46d, $d3d6f4fb
 DD $4369e96a, $346ed9fc, $ad678846, $da60b8d0
 DD $44042d73, $33031de5, $aa0a4c5f, $dd0d7cc9
 DD $5005713c, $270241aa, $be0b1010, $c90c2086
 DD $5768b525, $206f85b3, $b966d409, $ce61e49f
 DD $5edef90e, $29d9c998, $b0d09822, $c7d7a8b4
 DD $59b33d17, $2eb40d81, $b7bd5c3b, $c0ba6cad
 DD $edb88320, $9abfb3b6, $03b6e20c, $74b1d29a
 DD $ead54739, $9dd277af, $04db2615, $73dc1683
 DD $e3630b12, $94643b84, $0d6d6a3e, $7a6a5aa8
 DD $e40ecf0b, $9309ff9d, $0a00ae27, $7d079eb1
 DD $f00f9344, $8708a3d2, $1e01f268, $6906c2fe
 DD $f762575d, $806567cb, $196c3671, $6e6b06e7
 DD $fed41b76, $89d32be0, $10da7a5a, $67dd4acc
 DD $f9b9df6f, $8ebeeff9, $17b7be43, $60b08ed5
 DD $d6d6a3e8, $a1d1937e, $38d8c2c4, $4fdff252
 DD $d1bb67f1, $a6bc5767, $3fb506dd, $48b2364b
 DD $d80d2bda, $af0a1b4c, $36034af6, $41047a60
 DD $df60efc3, $a867df55, $316e8eef, $4669be79
 DD $cb61b38c, $bc66831a, $256fd2a0, $5268e236
 DD $cc0c7795, $bb0b4703, $220216b9, $5505262f
 DD $c5ba3bbe, $b2bd0b28, $2bb45a92, $5cb36a04
 DD $c2d7ffa7, $b5d0cf31, $2cd99e8b, $5bdeae1d
 DD $9b64c2b0, $ec63f226, $756aa39c, $026d930a
 DD $9c0906a9, $eb0e363f, $72076785, $05005713
 DD $95bf4a82, $e2b87a14, $7bb12bae, $0cb61b38
 DD $92d28e9b, $e5d5be0d, $7cdcefb7, $0bdbdf21
 DD $86d3d2d4, $f1d4e242, $68ddb3f8, $1fda836e
 DD $81be16cd, $f6b9265b, $6fb077e1, $18b74777
 DD $88085ae6, $ff0f6a70, $66063bca, $11010b5c
 DD $8f659eff, $f862ae69, $616bffd3, $166ccf45
 DD $a00ae278, $d70dd2ee, $4e048354, $3903b3c2
 DD $a7672661, $d06016f7, $4969474d, $3e6e77db
 DD $aed16a4a, $d9d65adc, $40df0b66, $37d83bf0
 DD $a9bcae53, $debb9ec5, $47b2cf7f, $30b5ffe9
 DD $bdbdf21c, $cabac28a, $53b39330, $24b4a3a6
 DD $bad03605, $cdd70693, $54de5729, $23d967bf
 DD $b3667a2e, $c4614ab8, $5d681b02, $2a6f2b94
 DD $b40bbe37, $c30c8ea1, $5a05df1b, $2d02ef8d
end;





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