Contributor: FLOOR A.C. NAAIJKENS     

{
Author: FLOOR A.C. NAAIJKENS

Part of The ECO Library II:
}

Unit Eco_CRC;

Interface

Function __CRC32(Value: Byte; CRC : LongInt) : LongInt;
Function __CRC16(Value: Byte; CRC : Word)    : Word;

Implementation

Function  __crc32(value: Byte; crc: LongInt): LongInt;
Const
  crc32_table : 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
  );

begin
  if crc = 0 then
    crc := $ffffffff; { must be set high to start With }
  __crc32 := crc32_table[Byte(crc xor LongInt(value))] xor
             ((crc shr 8) and $00ffffff);
end;



Function  __crc16(value: Byte; crc: Word): Word;
Const
  crc16_table : 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
   );

begin
  __crc16 := crc16_table[((crc shr 8) and 255)] xor
             (crc shl 8) xor value;
end;



end.

{==========================================================================}
{==========================================================================}
{==========================================================================}

CRC.PAS
{$M 65520, 0, 655360}
Uses
  Crt, Dos,
  eco_lib;

Var
  take32,
  take16      : Boolean;
  sourcepath,
  source      : String;
  numFiles, i : Word;
  srec        : SearchRec;
  filar       : Array[1..1024] of ^SearchRec;



Function convert32(fname: String; fsize: LongInt; x1, x2, y: Byte): String;
Const
  bufsize = 32768;
Type
  fbuf = Array[1..bufsize] of Byte;
Var
  i       :    Word;
  source  :    File;
  bread   :    Word;
  Filebuf :   ^fbuf;
  crc, tr : LongInt;
  nr      :    Real;

begin
  crc := $ffffffff;
  tr := 0;
  new(Filebuf);
  assign(source, fname);
  reset(source, 1);
  GotoXY(x1, y);
  Write(__rep(x2-x1-3, ''));
  Write('  ', fname);
  Repeat
    blockread(source, Filebuf^, bufsize, bread);
    tr := tr + bread;
    nr := tr/fsize;
    nr := nr * (x2-x1-3);
    GotoXY(x1, y);
    Write(__rep(trunc(nr), ''));
    For i := 1 to bread do
      crc := __crc32(Filebuf^[i], crc);
  Until (bread = 0);
  close(source);
  GotoXY(x1, y);
  dispose(Filebuf);
  Write(fname:12, '  ', fsize:7, ' Bytes.  HEX-CRC/32: ',__tohexstr(crc, 4));
  clreol; convert32 := '';
end;

Function convert16(fname: String; fsize: LongInt; x1, x2, y: Byte): String;
Const
  bufsize = 32768;
Type
  fbuf = Array[1..bufsize] of Byte;
Var
  i       :    Word;
  source  :    File;
  bread   :    Word;
  Filebuf :   ^fbuf;
  crc, tr : LongInt;
  nr      :    Real;

begin
  crc := $0000;
  tr := 0;
  new(Filebuf);
  assign(source, fname);
  reset(source, 1);
  GotoXY(x1, y);
  Write(__rep(x2-x1-3, ''));
  Write('  ', fname);
  Repeat
    blockread(source, Filebuf^, bufsize, bread);
    tr := tr + bread;
    nr := tr/fsize;
    nr := nr * (x2-x1-3);
    GotoXY(x1, y);
    Write(__rep(trunc(nr), ''));
    For i := 1 to bread do
      crc := __crc16(Filebuf^[i], crc);
  Until (bread = 0);
  close(source);
  GotoXY(x1, y);
  dispose(Filebuf);
  Write(fname:12, '  ', fsize:7, ' Bytes.  HEX-CRC/16: ', __tohexstr(crc, 2));
  clreol;
  convert16 := '';
end;



Function convert16_32(fname:String; fsize: LongInt; x1, x2, y: Byte):String;
Const
  bufsize = 32768;
Type
  fbuf = Array[1..bufsize] of Byte;
Var
  i       :    Word;
  source  :    File;
  bread   :    Word;
  Filebuf :   ^fbuf;
  crc,
  crc32,
  tr      : LongInt;
  nr      :    Real;

begin
  crc := $0000;
  tr := 0;
  crc32 := $ffffffff;
  new(Filebuf);
  assign(source, fname);
  reset(source, 1);
  GotoXY(x1, y);
  Write(__rep(x2-x1-3, ''));
  Write('  ', fname);
  Repeat
    blockread(source, Filebuf^, bufsize, bread);
    tr := tr + bread;
    nr := tr/fsize;
    nr := nr * (x2-x1-3);
    GotoXY(x1, y);
    Write(__rep(trunc(nr), ''));
    For i := 1 to bread do begin
      crc := __crc16(Filebuf^[i], crc);
      crc32 := __crc32(Filebuf^[i], crc32);
    end;
  Until (bread = 0);
  close(source);
  GotoXY(x1, y);
  dispose(Filebuf);
  Write(fname:12, '  ', fsize:7,' Bytes.  HEX-CRC/16: ', __tohexstr(crc, 2),
        ' 32: ', __tohexstr(crc32, 4));
  clreol;
  convert16_32 := '';
end;




{main}
begin
  source := fexpand(paramstr(1));
  take32 := False;
  take16 := False;
  if paramstr(2) = '/32' then
    take32 := True;
  if paramstr(2) = '/16' then
    take16 := True;
  numFiles := 0;
  findfirst(source, anyFile, srec);
  While Doserror=0 do
  begin
    if not (((srec.attr and directory) > 0) or ((srec.attr and volumeid) > 0)
             and (srec.size > 0)) then
    begin
      inc(numFiles);
      new(filar[numFiles]);
      filar[numFiles]^ := srec;
      filar[numFiles]^.name := __up(filar[numFiles]^.name);
    end; findnext(srec);
  end;
  Writeln(numFiles, ' File(s) found.');

  For i := 1 to numFiles do
    if take32 then
      Writeln(convert32(sourcepath + filar[i]^.name, filar[i]^.size,
              5, 35, WhereY))
      else
      if take16 then
        Writeln(convert16(sourcepath + filar[i]^.name, filar[i]^.size,
                5, 35, WhereY))
      else
        Writeln(convert16_32(sourcepath + filar[i]^.name, filar[i]^.size,
                5, 35, WhereY));
end.