174 lines
8.3 KiB
ObjectPascal
174 lines
8.3 KiB
ObjectPascal
// ====================================================================
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// Mystic BBS Software Copyright 1997-2013 By James Coyle
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// ====================================================================
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//
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// This file is part of Mystic BBS.
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//
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// Mystic BBS is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Mystic BBS is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Mystic BBS. If not, see <http://www.gnu.org/licenses/>.
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//
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// ====================================================================
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{
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Mystic Software Development Library
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===========================================================================
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File | M_CRC.PAS
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Desc | 16 and 32-bit CRC functions
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Created | August 22, 2002
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NOTES | CRC16 NOTES:
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| Your crc variable must be initialized to 0, before using this
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| routine. Translated to Pascal March, 1988 by J.R.Louvau
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| CRC32 NOTES:
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| Returns CRC32 in LOW to HIGH byte order
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| Initialise the variable to $FFFFFFFF before running the crc
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| routine. Derived from article Copyright (C) 1986 Stephen
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| Satchell. First arg must be in range 0 to 255. Second arg is
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| referenced twice. Credit to: Stephen Satchell, Satchell
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| Evaluations and Chuck Forsberg
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---------------------------------------------------------------------------
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}
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{$I M_OPS.PAS}
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{$WARNINGS OFF}
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Unit m_CRC;
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Interface
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Function Crc16 (CP: Byte; CRC: Word) : Word;
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Function Crc32 (Octet: Byte; CRC: LongInt) : LongInt;
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Function FileCRC32 (FileName: String) : LongInt;
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Function StringCRC32 (Str: String) : LongInt;
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Implementation
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Const
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CRCTAB : Array[0..255] of Word = (
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$0000, $1021, $2042, $3063, $4084, $50a5, $60c6, $70e7,
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$8108, $9129, $a14a, $b16b, $c18c, $d1ad, $e1ce, $f1ef,
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$1231, $0210, $3273, $2252, $52b5, $4294, $72f7, $62d6,
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$9339, $8318, $b37b, $a35a, $d3bd, $c39c, $f3ff, $e3de,
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$2462, $3443, $0420, $1401, $64e6, $74c7, $44a4, $5485,
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$a56a, $b54b, $8528, $9509, $e5ee, $f5cf, $c5ac, $d58d,
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$3653, $2672, $1611, $0630, $76d7, $66f6, $5695, $46b4,
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$b75b, $a77a, $9719, $8738, $f7df, $e7fe, $d79d, $c7bc,
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$48c4, $58e5, $6886, $78a7, $0840, $1861, $2802, $3823,
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$c9cc, $d9ed, $e98e, $f9af, $8948, $9969, $a90a, $b92b,
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$5af5, $4ad4, $7ab7, $6a96, $1a71, $0a50, $3a33, $2a12,
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$dbfd, $cbdc, $fbbf, $eb9e, $9b79, $8b58, $bb3b, $ab1a,
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$6ca6, $7c87, $4ce4, $5cc5, $2c22, $3c03, $0c60, $1c41,
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$edae, $fd8f, $cdec, $ddcd, $ad2a, $bd0b, $8d68, $9d49,
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$7e97, $6eb6, $5ed5, $4ef4, $3e13, $2e32, $1e51, $0e70,
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$ff9f, $efbe, $dfdd, $cffc, $bf1b, $af3a, $9f59, $8f78,
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$9188, $81a9, $b1ca, $a1eb, $d10c, $c12d, $f14e, $e16f,
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$1080, $00a1, $30c2, $20e3, $5004, $4025, $7046, $6067,
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$83b9, $9398, $a3fb, $b3da, $c33d, $d31c, $e37f, $f35e,
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$02b1, $1290, $22f3, $32d2, $4235, $5214, $6277, $7256,
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$b5ea, $a5cb, $95a8, $8589, $f56e, $e54f, $d52c, $c50d,
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$34e2, $24c3, $14a0, $0481, $7466, $6447, $5424, $4405,
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$a7db, $b7fa, $8799, $97b8, $e75f, $f77e, $c71d, $d73c,
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$26d3, $36f2, $0691, $16b0, $6657, $7676, $4615, $5634,
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$d94c, $c96d, $f90e, $e92f, $99c8, $89e9, $b98a, $a9ab,
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$5844, $4865, $7806, $6827, $18c0, $08e1, $3882, $28a3,
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$cb7d, $db5c, $eb3f, $fb1e, $8bf9, $9bd8, $abbb, $bb9a,
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$4a75, $5a54, $6a37, $7a16, $0af1, $1ad0, $2ab3, $3a92,
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$fd2e, $ed0f, $dd6c, $cd4d, $bdaa, $ad8b, $9de8, $8dc9,
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$7c26, $6c07, $5c64, $4c45, $3ca2, $2c83, $1ce0, $0cc1,
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$ef1f, $ff3e, $cf5d, $df7c, $af9b, $bfba, $8fd9, $9ff8,
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$6e17, $7e36, $4e55, $5e74, $2e93, $3eb2, $0ed1, $1ef0
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);
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Function Crc16 (CP: Byte; CRC: Word) : Word;
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Begin
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Crc16 := CRCTAB[((CRC shr 8) and 255)] xor (CRC shl 8) xor CP;
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End;
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Const
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CRC_32_TAB: Array[0..255] of LongInt = (
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$00000000, $77073096, $ee0e612c, $990951ba, $076dc419, $706af48f, $e963a535, $9e6495a3,
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$0edb8832, $79dcb8a4, $e0d5e91e, $97d2d988, $09b64c2b, $7eb17cbd, $e7b82d07, $90bf1d91,
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$1db71064, $6ab020f2, $f3b97148, $84be41de, $1adad47d, $6ddde4eb, $f4d4b551, $83d385c7,
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$136c9856, $646ba8c0, $fd62f97a, $8a65c9ec, $14015c4f, $63066cd9, $fa0f3d63, $8d080df5,
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$3b6e20c8, $4c69105e, $d56041e4, $a2677172, $3c03e4d1, $4b04d447, $d20d85fd, $a50ab56b,
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$35b5a8fa, $42b2986c, $dbbbc9d6, $acbcf940, $32d86ce3, $45df5c75, $dcd60dcf, $abd13d59,
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$26d930ac, $51de003a, $c8d75180, $bfd06116, $21b4f4b5, $56b3c423, $cfba9599, $b8bda50f,
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$2802b89e, $5f058808, $c60cd9b2, $b10be924, $2f6f7c87, $58684c11, $c1611dab, $b6662d3d,
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$76dc4190, $01db7106, $98d220bc, $efd5102a, $71b18589, $06b6b51f, $9fbfe4a5, $e8b8d433,
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$7807c9a2, $0f00f934, $9609a88e, $e10e9818, $7f6a0dbb, $086d3d2d, $91646c97, $e6635c01,
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$6b6b51f4, $1c6c6162, $856530d8, $f262004e, $6c0695ed, $1b01a57b, $8208f4c1, $f50fc457,
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$65b0d9c6, $12b7e950, $8bbeb8ea, $fcb9887c, $62dd1ddf, $15da2d49, $8cd37cf3, $fbd44c65,
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$4db26158, $3ab551ce, $a3bc0074, $d4bb30e2, $4adfa541, $3dd895d7, $a4d1c46d, $d3d6f4fb,
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$4369e96a, $346ed9fc, $ad678846, $da60b8d0, $44042d73, $33031de5, $aa0a4c5f, $dd0d7cc9,
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$5005713c, $270241aa, $be0b1010, $c90c2086, $5768b525, $206f85b3, $b966d409, $ce61e49f,
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$5edef90e, $29d9c998, $b0d09822, $c7d7a8b4, $59b33d17, $2eb40d81, $b7bd5c3b, $c0ba6cad,
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$edb88320, $9abfb3b6, $03b6e20c, $74b1d29a, $ead54739, $9dd277af, $04db2615, $73dc1683,
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$e3630b12, $94643b84, $0d6d6a3e, $7a6a5aa8, $e40ecf0b, $9309ff9d, $0a00ae27, $7d079eb1,
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$f00f9344, $8708a3d2, $1e01f268, $6906c2fe, $f762575d, $806567cb, $196c3671, $6e6b06e7,
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$fed41b76, $89d32be0, $10da7a5a, $67dd4acc, $f9b9df6f, $8ebeeff9, $17b7be43, $60b08ed5,
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$d6d6a3e8, $a1d1937e, $38d8c2c4, $4fdff252, $d1bb67f1, $a6bc5767, $3fb506dd, $48b2364b,
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$d80d2bda, $af0a1b4c, $36034af6, $41047a60, $df60efc3, $a867df55, $316e8eef, $4669be79,
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$cb61b38c, $bc66831a, $256fd2a0, $5268e236, $cc0c7795, $bb0b4703, $220216b9, $5505262f,
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$c5ba3bbe, $b2bd0b28, $2bb45a92, $5cb36a04, $c2d7ffa7, $b5d0cf31, $2cd99e8b, $5bdeae1d,
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$9b64c2b0, $ec63f226, $756aa39c, $026d930a, $9c0906a9, $eb0e363f, $72076785, $05005713,
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$95bf4a82, $e2b87a14, $7bb12bae, $0cb61b38, $92d28e9b, $e5d5be0d, $7cdcefb7, $0bdbdf21,
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$86d3d2d4, $f1d4e242, $68ddb3f8, $1fda836e, $81be16cd, $f6b9265b, $6fb077e1, $18b74777,
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$88085ae6, $ff0f6a70, $66063bca, $11010b5c, $8f659eff, $f862ae69, $616bffd3, $166ccf45,
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$a00ae278, $d70dd2ee, $4e048354, $3903b3c2, $a7672661, $d06016f7, $4969474d, $3e6e77db,
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$aed16a4a, $d9d65adc, $40df0b66, $37d83bf0, $a9bcae53, $debb9ec5, $47b2cf7f, $30b5ffe9,
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$bdbdf21c, $cabac28a, $53b39330, $24b4a3a6, $bad03605, $cdd70693, $54de5729, $23d967bf,
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$b3667a2e, $c4614ab8, $5d681b02, $2a6f2b94, $b40bbe37, $c30c8ea1, $5a05df1b, $2d02ef8d
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);
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Function Crc32 (Octet: Byte; CRC: LongInt) : LongInt;
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Begin
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Crc32 := LongInt(CRC_32_TAB[Byte(CRC xor LongInt(Octet))] xor ((CRC shr 8) and $00FFFFFF));
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End;
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Function StringCRC32 (Str: String) : LongInt;
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Var
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Count : Byte;
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Begin
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Result := $FFFFFFFF;
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For Count := 1 to Length(Str) Do
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Result := CRC32(Byte(Str[Count]), Result);
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End;
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Function FileCRC32 (FileName: String) : LongInt;
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Var
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InFile : File;
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Buffer : Array[1..1024*8] of Byte;
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BufSize : SmallInt;
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Count : SmallInt;
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Begin
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Result := LongInt($FFFFFFFF);
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Assign (InFile, FileName);
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Reset (InFile, 1);
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If IoResult <> 0 Then Exit;
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While Not Eof(InFile) Do Begin
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BlockRead (InFile, Buffer, SizeOf(Buffer), BufSize);
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For Count := 1 to Bufsize Do
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Result := Crc32(Buffer[Count], Result);
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End;
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Close (InFile);
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End;
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End.
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