kazip.pas

Complete Zip Program

  ZL_ENCH_COMPRESSIONMETHOD = $9;  { Enchanced Deflate }
  ZL_DEF_COMPRESSIONINFO    = $7;  { 32k window for Deflate }
  ZL_PRESET_DICT            = $20;

  ZL_FASTEST_COMPRESSION    = $0;
  ZL_FAST_COMPRESSION       = $1;
  ZL_DEFAULT_COMPRESSION    = $2;
  ZL_MAXIMUM_COMPRESSION    = $3;

  ZL_FCHECK_MASK            = $1F;
  ZL_CINFO_MASK             = $F0; { mask out leftmost 4 bits }
  ZL_FLEVEL_MASK            = $C0; { mask out leftmost 2 bits }
  ZL_CM_MASK                = $0F; { mask out rightmost 4 bits }

const
  CRCTable: array[0..255] of Cardinal = (
    $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);



procedure Register;
begin
  RegisterComponents('KA', [TKAZip]);
end;

Function ToZipName(FileName:String):String;
Var
 P : Integer;
Begin
  Result := FileName;
  Result := StringReplace(Result,'\','/',[rfReplaceAll]);
  P := Pos(':/',Result);
  if P > 0 Then
     Begin
       System.Delete(Result,1,P+1);
     End;
  P := Pos('//',Result);
  if P > 0 Then
     Begin
       System.Delete(Result,1,P+1);
       P := Pos('/',Result);
       if P > 0 Then
          Begin
             System.Delete(Result,1,P);
             P := Pos('/',Result);
             if P > 0 Then System.Delete(Result,1,P);
          End;
     End;
End;


Function ToDosName(FileName:String):String;
Var
 P : Integer;
Begin
  Result := FileName;
  Result := StringReplace(Result,'\','/',[rfReplaceAll]);
  P := Pos(':/',Result);
  if P > 0 Then
     Begin
       System.Delete(Result,1,P+1);
     End;
  P := Pos('//',Result);
  if P > 0 Then
     Begin
       System.Delete(Result,1,P+1);
       P := Pos('/',Result);
       if P > 0 Then
          Begin
             System.Delete(Result,1,P);
             P := Pos('/',Result);
             if P > 0 Then System.Delete(Result,1,P);
          End;
     End;
  Result := StringReplace(Result,'/','\',[rfReplaceAll]);
End;

{ TKAZipEntriesEntry }

constructor TKAZipEntriesEntry.Create(Collection: TCollection);
begin
  inherited Create(Collection);
  FParent   := TKAZipEntries(Collection);
  FSelected := False;
end;

destructor TKAZipEntriesEntry.Destroy;
begin

  inherited Destroy;
end;

procedure TKAZipEntriesEntry.ExtractToFile(FileName: String);
begin
  FParent.ExtractToFile(Self,FileName);
end;

procedure TKAZipEntriesEntry.ExtractToStream(Stream: TStream);
begin
  FParent.ExtractToStream(Self,Stream);
end;

procedure TKAZipEntriesEntry.SaveToFile(FileName: String);
begin
  ExtractToFile(FileName);
end;

procedure TKAZipEntriesEntry.SaveToStream(Stream: TStream);
begin
  ExtractToStream(Stream);
end;


function TKAZipEntriesEntry.GetCompressedData(Stream: TStream): Integer;
Var
  FZLHeader : TZLibStreamHeader;
  BA        : TLocalFile;
  ZLH       : Word;
  Compress  : Byte;
begin
  Result := 0;
  if (CompressionMethod=8) Then
     Begin
       FZLHeader.CMF := (ZL_DEF_COMPRESSIONINFO shl 4);               { 32k Window size }
       FZLHeader.CMF := FZLHeader.CMF or ZL_DEF_COMPRESSIONMETHOD;    { Deflate }
       Compress := ZL_DEFAULT_COMPRESSION;
       Case BitFlag AND 6 of
            0 : Compress := ZL_DEFAULT_COMPRESSION;
            2 : Compress := ZL_MAXIMUM_COMPRESSION;
            4 : Compress := ZL_FAST_COMPRESSION;
            6 : Compress := ZL_FASTEST_COMPRESSION;
       End;
       FZLHeader.FLG := FZLHeader.FLG or (Compress shl 6);
       FZLHeader.FLG := FZLHeader.FLG and not ZL_PRESET_DICT;         { no preset dictionary}
       FZLHeader.FLG := FZLHeader.FLG and not ZL_FCHECK_MASK;
       ZLH           := (FZLHeader.CMF * 256) + FZLHeader.FLG;
       Inc(FZLHeader.FLG, 31 - (ZLH mod 31));
       Result := Result + Stream.Write(FZLHeader,SizeOf(FZLHeader));
     End;
  BA     := FParent.GetLocalEntry(FParent.FParent.FZipStream,LocalOffset,False);
  if SizeCompressed > 0 Then
     Result := Result + Stream.Write(BA.CompressedData[1],SizeCompressed);
end;

function TKAZipEntriesEntry.GetCompressedData: String;
Var
  BA        : TLocalFile;
  FZLHeader : TZLibStreamHeader;
  ZLH       : Word;
  Compress  : Byte;
begin
  Result := '';
  if (CompressionMethod=0) or (CompressionMethod=8) Then
     Begin
       BA     := FParent.GetLocalEntry(FParent.FParent.FZipStream,LocalOffset,False);
       if (CompressionMethod=8) Then
          Begin
            FZLHeader.CMF := (ZL_DEF_COMPRESSIONINFO shl 4);               { 32k Window size }
            FZLHeader.CMF := FZLHeader.CMF or ZL_DEF_COMPRESSIONMETHOD;    { Deflate }
            Compress := ZL_DEFAULT_COMPRESSION;
            Case BitFlag AND 6 of
                 0 : Compress := ZL_DEFAULT_COMPRESSION;
                 2 : Compress := ZL_MAXIMUM_COMPRESSION;
                 4 : Compress := ZL_FAST_COMPRESSION;
                 6 : Compress := ZL_FASTEST_COMPRESSION;
            End;
            FZLHeader.FLG := FZLHeader.FLG or (Compress shl 6);
            FZLHeader.FLG := FZLHeader.FLG and not ZL_PRESET_DICT;         { no preset dictionary}
            FZLHeader.FLG := FZLHeader.FLG and not ZL_FCHECK_MASK;
            ZLH           := (FZLHeader.CMF * 256) + FZLHeader.FLG;
            Inc(FZLHeader.FLG, 31 - (ZLH mod 31));
            SetLength(Result,SizeOf(FZLHeader));
            SetString(Result,PChar(@FZLHeader),SizeOf(FZLHeader));
          End;
       Result := Result + BA.CompressedData;
     End
  Else
     Begin
       SetLength(Result,0);
     End;
End;

procedure TKAZipEntriesEntry.SetSelected(const Value: Boolean);
begin
  FSelected := Value;
end;

function TKAZipEntriesEntry.GetLocalEntrySize: Cardinal;
begin
 Result := SizeOf(TLocalFile) - 3*SizeOf(String)+
           FCentralDirectoryFile.CompressedSize+
           FCentralDirectoryFile.FilenameLength+
           FCentralDirectoryFile.ExtraFieldLength;
 if (FCentralDirectoryFile.GeneralPurposeBitFlag And (1 SHL 3)) > 0 Then
    Begin
      Result := Result + SizeOf(TDataDescriptor);
    End;
end;

function TKAZipEntriesEntry.GetCentralEntrySize: Cardinal;
begin
  Result := SizeOf(TCentralDirectoryFile) - 3*SizeOf(String)+
                   FCentralDirectoryFile.FilenameLength+
                   FCentralDirectoryFile.ExtraFieldLength+
                   FCentralDirectoryFile.FileCommentLength;
end;

function TKAZipEntriesEntry.Test: Boolean;
Var
  FS : TFileStream;
  FN : String;
begin
  Result  := True;
  if NOT FIsEncrypted Then
     Begin
        FN := FParent.FParent.GetDelphiTempFileName;
        FS := TFileStream.Create(FN,fmOpenReadWrite or FmCreate);
        Try
          ExtractToStream(FS);
          FS.Position := 0;
          Result      := FParent.CalculateCRCFromStream(FS) = CRC32;
        Finally
          FS.Free;
          DeleteFile(FN);
        End;
     End;
end;

{ TKAZipEntries }
constructor TKAZipEntries.Create(AOwner : TKAZip);
begin
  Inherited Create(TKAZipEntriesEntry);
  FParent    := AOwner;
  FIsZipFile := False;
end;

constructor TKAZipEntries.Create(AOwner : TKAZip; MS : TStream);
begin
  Inherited Create(TKAZipEntriesEntry);
  FParent    := AOwner;
  FIsZipFile := False;
  ParseZip(MS);
end;

destructor TKAZipEntries.Destroy;
begin

  inherited Destroy;
end;

function TKAZipEntries.Adler32(adler : uLong; buf : pByte; len : uInt) : uLong;
const
  BASE = uLong(65521);
  NMAX = 3854;
var
  s1, s2 : uLong;
  k      : Integer;
begin
  s1 := adler and $ffff;
  s2 := (adler shr 16) and $ffff;

  if not Assigned(buf) then
  begin
    adler32 := uLong(1);
    exit;
  end;

  while (len > 0) do
  begin
    if len < NMAX then
      k := len
    else
      k := NMAX;
    Dec(len, k);
    while (k > 0) do
    begin
      Inc(s1, buf^);
      Inc(s2, s1);
      Inc(buf);
      Dec(k);
    end;
    s1 := s1 mod BASE;
    s2 := s2 mod BASE;
  end;
  adler32 := (s2 shl 16) or s1;
end;

function TKAZipEntries.CalcCRC32(const UncompressedData : string): Cardinal;
var
  X : Integer;
begin
  Result := $FFFFFFFF;
  for X := 0 to Length(UncompressedData) - 1 do
      Begin
        Result := (Result SHR 8) XOR (CRCTable[Byte(Result) XOR Ord(UncompressedData[X+1])]);
      End;
  Result := Result XOR $FFFFFFFF;
end;


function TKAZipEntries.CalculateCRCFromStream(var Stream: TFileStream): Cardinal;