From dbb0bfbf4fdb6c2b7bff98ce2430ceccbc6c7715 Mon Sep 17 00:00:00 2001 From: mysticbbs Date: Mon, 13 Feb 2012 18:47:33 -0500 Subject: [PATCH] Initial import --- mdl/m_crc.pas | 117 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 117 insertions(+) create mode 100644 mdl/m_crc.pas diff --git a/mdl/m_crc.pas b/mdl/m_crc.pas new file mode 100644 index 0000000..413f86e --- /dev/null +++ b/mdl/m_crc.pas @@ -0,0 +1,117 @@ +{ + Mystic Software Development Library + =========================================================================== + File | M_CRC.PAS + Desc | 16 and 32-bit CRC functions + Created | August 22, 2002 + | + NOTES | CRC16 NOTES: + | Your crc variable must be initialized to 0, before using this + | routine. Translated to Pascal March, 1988 by J.R.Louvau + | + | CRC32 NOTES: + | Returns CRC32 in LOW to HIGH byte order + | Initialise the variable to $FFFFFFFF before running the crc + | routine. Derived from article Copyright (C) 1986 Stephen + | Satchell. First arg must be in range 0 to 255. Second arg is + | referenced twice. Credit to: Stephen Satchell, Satchell + | Evaluations and Chuck Forsberg + | + --------------------------------------------------------------------------- +} + +{$I M_OPS.PAS} +{$WARNINGS OFF} + +Unit m_CRC; + +Interface + +Function Crc16 (CP: Byte; CRC: Word) : Word; +Function Crc32 (Octet: Byte; CRC: LongInt) : LongInt; + +Implementation + +Const + CRCTAB : Array[0..255] of Word = ( + $0000, $1021, $2042, $3063, $4084, $50a5, $60c6, $70e7, + $8108, $9129, $a14a, $b16b, $c18c, $d1ad, $e1ce, $f1ef, + $1231, $0210, $3273, $2252, $52b5, $4294, $72f7, $62d6, + $9339, $8318, $b37b, $a35a, $d3bd, $c39c, $f3ff, $e3de, + $2462, $3443, $0420, $1401, $64e6, $74c7, $44a4, $5485, + $a56a, $b54b, $8528, $9509, $e5ee, $f5cf, $c5ac, $d58d, + $3653, $2672, $1611, $0630, $76d7, $66f6, $5695, $46b4, + $b75b, $a77a, $9719, $8738, $f7df, $e7fe, $d79d, $c7bc, + $48c4, $58e5, $6886, $78a7, $0840, $1861, $2802, $3823, + $c9cc, $d9ed, $e98e, $f9af, $8948, $9969, $a90a, $b92b, + $5af5, $4ad4, $7ab7, $6a96, $1a71, $0a50, $3a33, $2a12, + $dbfd, $cbdc, $fbbf, $eb9e, $9b79, $8b58, $bb3b, $ab1a, + $6ca6, $7c87, $4ce4, $5cc5, $2c22, $3c03, $0c60, $1c41, + $edae, $fd8f, $cdec, $ddcd, $ad2a, $bd0b, $8d68, $9d49, + $7e97, $6eb6, $5ed5, $4ef4, $3e13, $2e32, $1e51, $0e70, + $ff9f, $efbe, $dfdd, $cffc, $bf1b, $af3a, $9f59, $8f78, + $9188, $81a9, $b1ca, $a1eb, $d10c, $c12d, $f14e, $e16f, + $1080, $00a1, $30c2, $20e3, $5004, $4025, $7046, $6067, + $83b9, $9398, $a3fb, $b3da, $c33d, $d31c, $e37f, $f35e, + $02b1, $1290, $22f3, $32d2, $4235, $5214, $6277, $7256, + $b5ea, $a5cb, $95a8, $8589, $f56e, $e54f, $d52c, $c50d, + $34e2, $24c3, $14a0, $0481, $7466, $6447, $5424, $4405, + $a7db, $b7fa, $8799, $97b8, $e75f, $f77e, $c71d, $d73c, + $26d3, $36f2, $0691, $16b0, $6657, $7676, $4615, $5634, + $d94c, $c96d, $f90e, $e92f, $99c8, $89e9, $b98a, $a9ab, + $5844, $4865, $7806, $6827, $18c0, $08e1, $3882, $28a3, + $cb7d, $db5c, $eb3f, $fb1e, $8bf9, $9bd8, $abbb, $bb9a, + $4a75, $5a54, $6a37, $7a16, $0af1, $1ad0, $2ab3, $3a92, + $fd2e, $ed0f, $dd6c, $cd4d, $bdaa, $ad8b, $9de8, $8dc9, + $7c26, $6c07, $5c64, $4c45, $3ca2, $2c83, $1ce0, $0cc1, + $ef1f, $ff3e, $cf5d, $df7c, $af9b, $bfba, $8fd9, $9ff8, + $6e17, $7e36, $4e55, $5e74, $2e93, $3eb2, $0ed1, $1ef0 +); + +Function Crc16 (CP: Byte; CRC: Word) : Word; +Begin + Crc16 := CRCTAB[((CRC shr 8) and 255)] xor (CRC shl 8) xor CP; +End; + +Const + CRC_32_TAB: Array[0..255] of LongInt = ( + $00000000, $77073096, $ee0e612c, $990951ba, $076dc419, $706af48f, $e963a535, $9e6495a3, + $0edb8832, $79dcb8a4, $e0d5e91e, $97d2d988, $09b64c2b, $7eb17cbd, $e7b82d07, $90bf1d91, + $1db71064, $6ab020f2, $f3b97148, $84be41de, $1adad47d, $6ddde4eb, $f4d4b551, $83d385c7, + $136c9856, $646ba8c0, $fd62f97a, $8a65c9ec, $14015c4f, $63066cd9, $fa0f3d63, $8d080df5, + $3b6e20c8, $4c69105e, $d56041e4, $a2677172, $3c03e4d1, $4b04d447, $d20d85fd, $a50ab56b, + $35b5a8fa, $42b2986c, $dbbbc9d6, $acbcf940, $32d86ce3, $45df5c75, $dcd60dcf, $abd13d59, + $26d930ac, $51de003a, $c8d75180, $bfd06116, $21b4f4b5, $56b3c423, $cfba9599, $b8bda50f, + $2802b89e, $5f058808, $c60cd9b2, $b10be924, $2f6f7c87, $58684c11, $c1611dab, $b6662d3d, + $76dc4190, $01db7106, $98d220bc, $efd5102a, $71b18589, $06b6b51f, $9fbfe4a5, $e8b8d433, + $7807c9a2, $0f00f934, $9609a88e, $e10e9818, $7f6a0dbb, $086d3d2d, $91646c97, $e6635c01, + $6b6b51f4, $1c6c6162, $856530d8, $f262004e, $6c0695ed, $1b01a57b, $8208f4c1, $f50fc457, + $65b0d9c6, $12b7e950, $8bbeb8ea, $fcb9887c, $62dd1ddf, $15da2d49, $8cd37cf3, $fbd44c65, + $4db26158, $3ab551ce, $a3bc0074, $d4bb30e2, $4adfa541, $3dd895d7, $a4d1c46d, $d3d6f4fb, + $4369e96a, $346ed9fc, $ad678846, $da60b8d0, $44042d73, $33031de5, $aa0a4c5f, $dd0d7cc9, + $5005713c, $270241aa, $be0b1010, $c90c2086, $5768b525, $206f85b3, $b966d409, $ce61e49f, + $5edef90e, $29d9c998, $b0d09822, $c7d7a8b4, $59b33d17, $2eb40d81, $b7bd5c3b, $c0ba6cad, + $edb88320, $9abfb3b6, $03b6e20c, $74b1d29a, $ead54739, $9dd277af, $04db2615, $73dc1683, + $e3630b12, $94643b84, $0d6d6a3e, $7a6a5aa8, $e40ecf0b, $9309ff9d, $0a00ae27, $7d079eb1, + $f00f9344, $8708a3d2, $1e01f268, $6906c2fe, $f762575d, $806567cb, $196c3671, $6e6b06e7, + $fed41b76, $89d32be0, $10da7a5a, $67dd4acc, $f9b9df6f, $8ebeeff9, $17b7be43, $60b08ed5, + $d6d6a3e8, $a1d1937e, $38d8c2c4, $4fdff252, $d1bb67f1, $a6bc5767, $3fb506dd, $48b2364b, + $d80d2bda, $af0a1b4c, $36034af6, $41047a60, $df60efc3, $a867df55, $316e8eef, $4669be79, + $cb61b38c, $bc66831a, $256fd2a0, $5268e236, $cc0c7795, $bb0b4703, $220216b9, $5505262f, + $c5ba3bbe, $b2bd0b28, $2bb45a92, $5cb36a04, $c2d7ffa7, $b5d0cf31, $2cd99e8b, $5bdeae1d, + $9b64c2b0, $ec63f226, $756aa39c, $026d930a, $9c0906a9, $eb0e363f, $72076785, $05005713, + $95bf4a82, $e2b87a14, $7bb12bae, $0cb61b38, $92d28e9b, $e5d5be0d, $7cdcefb7, $0bdbdf21, + $86d3d2d4, $f1d4e242, $68ddb3f8, $1fda836e, $81be16cd, $f6b9265b, $6fb077e1, $18b74777, + $88085ae6, $ff0f6a70, $66063bca, $11010b5c, $8f659eff, $f862ae69, $616bffd3, $166ccf45, + $a00ae278, $d70dd2ee, $4e048354, $3903b3c2, $a7672661, $d06016f7, $4969474d, $3e6e77db, + $aed16a4a, $d9d65adc, $40df0b66, $37d83bf0, $a9bcae53, $debb9ec5, $47b2cf7f, $30b5ffe9, + $bdbdf21c, $cabac28a, $53b39330, $24b4a3a6, $bad03605, $cdd70693, $54de5729, $23d967bf, + $b3667a2e, $c4614ab8, $5d681b02, $2a6f2b94, $b40bbe37, $c30c8ea1, $5a05df1b, $2d02ef8d + ); + +Function Crc32 (Octet: Byte; CRC: LongInt) : LongInt; +Begin + Crc32 := CRC_32_TAB[Byte(CRC xor LongInt(Octet))] xor ((CRC shr 8) and $00FFFFFF); +End; + +End.