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UHashUnit.pas
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109 lines (97 loc) · 4.72 KB
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unit UHashUnit;
// -----------------------------------------------------------------------------
// Application: TextDiff .
// Module: HashUnit .
// Version: 4.1 .
// Date: 16-JAN-2004 .
// Target: Win32, Delphi 7 .
// Author: Angus Johnson - angusj-AT-myrealbox-DOT-com .
// Copyright; © 2003-2004 Angus Johnson .
// -----------------------------------------------------------------------------
interface
function HashLine(const Line: string;
IgnoreCase, IgnoreBlanks: Boolean): Integer;
implementation
uses
Windows, SysUtils;
const
Table: array [0 .. 255] of DWORD = ($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);
// CRC algorithm courtesy of Earl F. Glynn ...
// (http://www.efg2.com/Lab/Mathematics/CRC.htm)
function CalcCRC32(Posi: PChar; Length: Integer): DWORD;
begin
Result := $FFFFFFFF;
for var I := 0 to Length - 1 do
begin
Result := (Result shr 8) xor Table[PByte(Posi)^ xor (Result and $000000FF)];
Inc(Posi);
end;
Result := not Result;
end;
function HashLine(const Line: string;
IgnoreCase, IgnoreBlanks: Boolean): Integer;
var
Int, IntJ, Len: Integer;
Str: string;
begin
Str := Line;
if IgnoreBlanks then
begin
Int := 1;
IntJ := 1;
Len := Length(Line);
while Int <= Len do
begin
if not CharInSet(Line[Int], [#9, #32]) then
begin
Str[IntJ] := Line[Int];
Inc(IntJ);
end;
Inc(Int);
end;
SetLength(Str, IntJ - 1);
end;
if IgnoreCase then
Str := AnsiLowerCase(Str);
Result := CalcCRC32(PChar(Str), Length(Str));
end;
end.