CRC32_BZIP2.pas

unit CRC32_BZIP2;
//CRC-32 BZIP2
//Author: domasz
//Last Update: 2022-11-20
//Licence: MIT

interface

uses SysUtils, HasherBase;

type THasherCRC32_BZIP2 = class(THasherbase)
  private
    FHash: Cardinal;
  public
    constructor Create; override;
    procedure Update(Msg: PByte; Length: Integer); override;
    function Final: String; override;
end;


implementation

var Table: array[0..255] of LongInt = (
$00000000, $04C11DB7, $09823B6E, $0D4326D9, $130476DC, $17C56B6B, $1A864DB2, $1E475005, 
$2608EDB8, $22C9F00F, $2F8AD6D6, $2B4BCB61, $350C9B64, $31CD86D3, $3C8EA00A, $384FBDBD, 
$4C11DB70, $48D0C6C7, $4593E01E, $4152FDA9, $5F15ADAC, $5BD4B01B, $569796C2, $52568B75, 
$6A1936C8, $6ED82B7F, $639B0DA6, $675A1011, $791D4014, $7DDC5DA3, $709F7B7A, $745E66CD, 
$9823B6E0, $9CE2AB57, $91A18D8E, $95609039, $8B27C03C, $8FE6DD8B, $82A5FB52, $8664E6E5, 
$BE2B5B58, $BAEA46EF, $B7A96036, $B3687D81, $AD2F2D84, $A9EE3033, $A4AD16EA, $A06C0B5D, 
$D4326D90, $D0F37027, $DDB056FE, $D9714B49, $C7361B4C, $C3F706FB, $CEB42022, $CA753D95, 
$F23A8028, $F6FB9D9F, $FBB8BB46, $FF79A6F1, $E13EF6F4, $E5FFEB43, $E8BCCD9A, $EC7DD02D, 
$34867077, $30476DC0, $3D044B19, $39C556AE, $278206AB, $23431B1C, $2E003DC5, $2AC12072, 
$128E9DCF, $164F8078, $1B0CA6A1, $1FCDBB16, $018AEB13, $054BF6A4, $0808D07D, $0CC9CDCA, 
$7897AB07, $7C56B6B0, $71159069, $75D48DDE, $6B93DDDB, $6F52C06C, $6211E6B5, $66D0FB02, 
$5E9F46BF, $5A5E5B08, $571D7DD1, $53DC6066, $4D9B3063, $495A2DD4, $44190B0D, $40D816BA, 
$ACA5C697, $A864DB20, $A527FDF9, $A1E6E04E, $BFA1B04B, $BB60ADFC, $B6238B25, $B2E29692, 
$8AAD2B2F, $8E6C3698, $832F1041, $87EE0DF6, $99A95DF3, $9D684044, $902B669D, $94EA7B2A, 
$E0B41DE7, $E4750050, $E9362689, $EDF73B3E, $F3B06B3B, $F771768C, $FA325055, $FEF34DE2, 
$C6BCF05F, $C27DEDE8, $CF3ECB31, $CBFFD686, $D5B88683, $D1799B34, $DC3ABDED, $D8FBA05A, 
$690CE0EE, $6DCDFD59, $608EDB80, $644FC637, $7A089632, $7EC98B85, $738AAD5C, $774BB0EB, 
$4F040D56, $4BC510E1, $46863638, $42472B8F, $5C007B8A, $58C1663D, $558240E4, $51435D53, 
$251D3B9E, $21DC2629, $2C9F00F0, $285E1D47, $36194D42, $32D850F5, $3F9B762C, $3B5A6B9B, 
$0315D626, $07D4CB91, $0A97ED48, $0E56F0FF, $1011A0FA, $14D0BD4D, $19939B94, $1D528623, 
$F12F560E, $F5EE4BB9, $F8AD6D60, $FC6C70D7, $E22B20D2, $E6EA3D65, $EBA91BBC, $EF68060B, 
$D727BBB6, $D3E6A601, $DEA580D8, $DA649D6F, $C423CD6A, $C0E2D0DD, $CDA1F604, $C960EBB3, 
$BD3E8D7E, $B9FF90C9, $B4BCB610, $B07DABA7, $AE3AFBA2, $AAFBE615, $A7B8C0CC, $A379DD7B, 
$9B3660C6, $9FF77D71, $92B45BA8, $9675461F, $8832161A, $8CF30BAD, $81B02D74, $857130C3, 
$5D8A9099, $594B8D2E, $5408ABF7, $50C9B640, $4E8EE645, $4A4FFBF2, $470CDD2B, $43CDC09C, 
$7B827D21, $7F436096, $7200464F, $76C15BF8, $68860BFD, $6C47164A, $61043093, $65C52D24, 
$119B4BE9, $155A565E, $18197087, $1CD86D30, $029F3D35, $065E2082, $0B1D065B, $0FDC1BEC, 
$3793A651, $3352BBE6, $3E119D3F, $3AD08088, $2497D08D, $2056CD3A, $2D15EBE3, $29D4F654, 
$C5A92679, $C1683BCE, $CC2B1D17, $C8EA00A0, $D6AD50A5, $D26C4D12, $DF2F6BCB, $DBEE767C, 
$E3A1CBC1, $E760D676, $EA23F0AF, $EEE2ED18, $F0A5BD1D, $F464A0AA, $F9278673, $FDE69BC4, 
$89B8FD09, $8D79E0BE, $803AC667, $84FBDBD0, $9ABC8BD5, $9E7D9662, $933EB0BB, $97FFAD0C, 
$AFB010B1, $AB710D06, $A6322BDF, $A2F33668, $BCB4666D, $B8757BDA, $B5365D03, $B1F740B4
);

constructor THasherCRC32_BZIP2.Create;
begin
  inherited Create;
  FHash := $FFFFFFFF;
  Check := 'FC891918';
end;

procedure THasherCRC32_BZIP2.Update(Msg: PByte; Length: Integer);
var i: Integer;
begin
  for i:=0 to Length-1 do begin
    FHash := (FHash shl 8) xor Table[Msg^ xor (FHash shr 24)];
    Inc(Msg);
  end;   
end;

function THasherCRC32_BZIP2.Final: String;
begin
  FHash := FHash xor $FFFFFFFF;
  Result := IntToHex(FHash, 8);
end;


initialization
  HasherList.RegisterHasher('CRC-32 BZIP2', THasherCRC32_BZIP2);

end.