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487 lines
18 KiB
Plaintext
487 lines
18 KiB
Plaintext
unit SciZipFile;
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// Copyright 2005 Patrik Spanel
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// scilib@sendme.cz
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// Written from scratch using InfoZip PKZip file specification application note
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// ftp://ftp.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
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// uses the Borland out of the box zlib
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// 2005 Added support for streams (LoadFromStream(const ZipFileStream: TStream),SaveToStream(...))
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// Nick Naimo |
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// Marcin Wojda |
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interface
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uses SysUtils, Classes, Types, zlib, Windows;
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type
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TCommonFileHeader = packed record
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VersionNeededToExtract: WORD; // 2 bytes
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GeneralPurposeBitFlag: WORD; // 2 bytes
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CompressionMethod: WORD; // 2 bytes
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LastModFileTimeDate: DWORD; // 4 bytes
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Crc32: DWORD; // 4 bytes
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CompressedSize: DWORD; // 4 bytes
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UncompressedSize: DWORD; // 4 bytes
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FilenameLength: WORD; // 2 bytes
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ExtraFieldLength: WORD; // 2 bytes
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end;
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TLocalFile = packed record
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LocalFileHeaderSignature: DWORD; // 4 bytes (0x04034b50)
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CommonFileHeader: TCommonFileHeader; //
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filename: AnsiString; //variable size
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extrafield: AnsiString; //variable size
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CompressedData: AnsiString; //variable size
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end;
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TFileHeader = packed record
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CentralFileHeaderSignature: DWORD; // 4 bytes (0x02014b50)
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VersionMadeBy: WORD; // 2 bytes
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CommonFileHeader: TCommonFileHeader; //
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FileCommentLength: WORD; // 2 bytes
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DiskNumberStart: WORD; // 2 bytes
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InternalFileAttributes: WORD; // 2 bytes
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ExternalFileAttributes: DWORD; // 4 bytes
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RelativeOffsetOfLocalHeader: DWORD; // 4 bytes
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filename: AnsiString; //variable size
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extrafield: AnsiString; //variable size
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fileComment: AnsiString; //variable size
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end;
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TEndOfCentralDir = packed record
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EndOfCentralDirSignature: DWORD; // 4 bytes (0x06054b50)
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NumberOfThisDisk: WORD; // 2 bytes
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NumberOfTheDiskWithTheStart: WORD; // 2 bytes
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TotalNumberOfEntriesOnThisDisk: WORD; // 2 bytes
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TotalNumberOfEntries: WORD; // 2 bytes
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SizeOfTheCentralDirectory: DWORD; // 4 bytes
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OffsetOfStartOfCentralDirectory: DWORD; // 4 bytes
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ZipfileCommentLength: WORD; // 2 bytes
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end;
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TZipFile = class(TObject)
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Files: array of TLocalFile;
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CentralDirectory: array of TFileHeader;
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EndOfCentralDirectory: TEndOfCentralDir;
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ZipFileComment: string;
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private
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function GetUncompressed(i: integer): string;
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procedure SetUncompressed(i: integer; const Value: string);
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function GetDateTime(i: integer): TDateTime;
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procedure SetDateTime(i: integer; const Value: TDateTime);
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function GetCount: integer;
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function GetName(i: integer): string;
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procedure SetName(i: integer; const Value: string);
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public
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property Count: integer read GetCount;
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procedure AddFile(const name: string; FAttribute: DWord = 0);
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procedure SaveToFile(const filename: string);
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procedure SaveToStream(ZipFileStream: TStream);
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procedure LoadFromFile(const filename: string);
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procedure LoadFromStream(const ZipFileStream: TStream);
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property Uncompressed[i: integer]: string read GetUncompressed write
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SetUncompressed;
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property Data[i: integer]: string read GetUncompressed write
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SetUncompressed;
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property DateTime[i: integer]: TDateTime read GetDateTime write SetDateTime;
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property Name[i: integer]: string read GetName write SetName;
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end;
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EZipFileCRCError = class(Exception);
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function ZipCRC32(const Data: string): longword;
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implementation
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{ TZipFile }
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procedure TZipFile.SaveToFile(const filename: string);
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var
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ZipFileStream: TFileStream;
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begin
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ZipFileStream := TFileStream.Create(filename, fmCreate);
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try
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SaveToStream(ZipFileStream);
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finally
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ZipFileStream.Free;
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end;
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end;
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procedure TZipFile.SaveToStream(ZipFileStream: TStream);
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var
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i: integer;
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begin
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for i := 0 to High(Files) do
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with Files[i] do
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begin
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CentralDirectory[i].RelativeOffsetOfLocalHeader :=
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ZipFileStream.Position;
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ZipFileStream.Write(LocalFileHeaderSignature, 4);
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if (LocalFileHeaderSignature = ($04034B50)) then
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begin
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ZipFileStream.Write(CommonFileHeader, SizeOf(CommonFileHeader));
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ZipFileStream.Write(PChar(filename)^,
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CommonFileHeader.FilenameLength);
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ZipFileStream.Write(PChar(extrafield)^,
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CommonFileHeader.ExtraFieldLength);
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ZipFileStream.Write(PChar(CompressedData)^,
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CommonFileHeader.CompressedSize);
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end;
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end;
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EndOfCentralDirectory.OffsetOfStartOfCentralDirectory :=
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ZipFileStream.Position;
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for i := 0 to High(CentralDirectory) do
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with CentralDirectory[i] do
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begin
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ZipFileStream.Write(CentralFileHeaderSignature, 4);
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ZipFileStream.Write(VersionMadeBy, 2);
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ZipFileStream.Write(CommonFileHeader, SizeOf(CommonFileHeader));
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ZipFileStream.Write(FileCommentLength, 2);
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ZipFileStream.Write(DiskNumberStart, 2);
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ZipFileStream.Write(InternalFileAttributes, 2);
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ZipFileStream.Write(ExternalFileAttributes, 4);
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ZipFileStream.Write(RelativeOffsetOfLocalHeader, 4);
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ZipFileStream.Write(PChar(filename)^, length(filename));
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ZipFileStream.Write(PChar(extrafield)^, length(extrafield));
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ZipFileStream.Write(PChar(fileComment)^, length(fileComment));
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end;
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with EndOfCentralDirectory do
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begin
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EndOfCentralDirSignature := $06054B50;
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NumberOfThisDisk := 0;
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NumberOfTheDiskWithTheStart := 0;
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TotalNumberOfEntriesOnThisDisk := High(Files) + 1;
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TotalNumberOfEntries := High(Files) + 1;
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SizeOfTheCentralDirectory :=
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ZipFileStream.Position - OffsetOfStartOfCentralDirectory;
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ZipfileCommentLength := length(ZipFileComment);
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end;
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ZipFileStream.Write(EndOfCentralDirectory, SizeOf(EndOfCentralDirectory));
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ZipFileStream.Write(PChar(ZipFileComment)^, length(ZipFileComment));
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end;
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procedure TZipFile.LoadFromStream(const ZipFileStream: TStream);
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var
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n: integer;
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signature: DWORD;
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begin
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n := 0;
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repeat
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signature := 0;
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ZipFileStream.Read(signature, 4);
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if (ZipFileStream.Position = ZipFileStream.Size) then exit;
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until signature = $04034B50;
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repeat
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begin
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if (signature = $04034B50) then
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begin
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inc(n);
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SetLength(Files, n);
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SetLength(CentralDirectory, n);
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with Files[n - 1] do
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begin
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LocalFileHeaderSignature := signature;
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ZipFileStream.Read(CommonFileHeader, SizeOf(CommonFileHeader));
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SetLength(filename, CommonFileHeader.FilenameLength);
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ZipFileStream.Read(PChar(filename)^,
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CommonFileHeader.FilenameLength);
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SetLength(extrafield, CommonFileHeader.ExtraFieldLength);
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ZipFileStream.Read(PChar(extrafield)^,
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CommonFileHeader.ExtraFieldLength);
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SetLength(CompressedData, CommonFileHeader.CompressedSize);
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ZipFileStream.Read(PChar(CompressedData)^,
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CommonFileHeader.CompressedSize);
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end;
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end;
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end;
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signature := 0;
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ZipFileStream.Read(signature, 4);
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until signature <> ($04034B50);
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n := 0;
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repeat
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begin
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if (signature = $02014B50) then
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begin
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inc(n);
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with CentralDirectory[n - 1] do
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begin
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CentralFileHeaderSignature := signature;
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ZipFileStream.Read(VersionMadeBy, 2);
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ZipFileStream.Read(CommonFileHeader, SizeOf(CommonFileHeader));
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ZipFileStream.Read(FileCommentLength, 2);
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ZipFileStream.Read(DiskNumberStart, 2);
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ZipFileStream.Read(InternalFileAttributes, 2);
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ZipFileStream.Read(ExternalFileAttributes, 4);
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ZipFileStream.Read(RelativeOffsetOfLocalHeader, 4);
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SetLength(filename, CommonFileHeader.FilenameLength);
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ZipFileStream.Read(PChar(filename)^,
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CommonFileHeader.FilenameLength);
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SetLength(extrafield, CommonFileHeader.ExtraFieldLength);
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ZipFileStream.Read(PChar(extrafield)^,
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CommonFileHeader.ExtraFieldLength);
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SetLength(fileComment, FileCommentLength);
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ZipFileStream.Read(PChar(fileComment)^, FileCommentLength);
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end;
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end;
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end;
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signature := 0;
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ZipFileStream.Read(signature, 4);
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until signature <> ($02014B50);
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if signature = $06054B50 then
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begin
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EndOfCentralDirectory.EndOfCentralDirSignature := Signature;
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ZipFileStream.Read(EndOfCentralDirectory.NumberOfThisDisk,
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SizeOf(EndOfCentralDirectory) - 4);
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SetLength(ZipFileComment, EndOfCentralDirectory.ZipfileCommentLength);
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ZipFileStream.Read(PChar(ZipFileComment)^,
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EndOfCentralDirectory.ZipfileCommentLength);
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end;
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end;
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procedure TZipFile.LoadFromFile(const filename: string);
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var
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ZipFileStream: TFileStream;
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begin
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ZipFileStream := TFileStream.Create(filename, fmOpenRead or fmShareDenyWrite);
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try
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LoadFromStream(ZipFileStream);
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finally
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ZipFileStream.Free;
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end;
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end;
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function TZipFile.GetUncompressed(i: integer): string;
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var
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Decompressor: TDecompressionStream;
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UncompressedStream: TStringStream;
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Aheader: string;
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ReadBytes: integer;
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LoadedCrc32: DWORD;
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begin
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if (i < 0) or (i > High(Files)) then
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// begin
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// result := '';
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// exit;
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// end;
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raise Exception.Create('Index out of range.');
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Aheader := chr(120) + chr(156);
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//manufacture a 2 byte header for zlib; 4 byte footer is not required.
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UncompressedStream := TStringStream.Create(Aheader + Files[i].CompressedData);
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try {+}
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Decompressor := TDecompressionStream.Create(UncompressedStream);
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try {+}
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SetLength(Result, Files[i].CommonFileHeader.UncompressedSize);
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ReadBytes := Decompressor.Read(PChar(Result)^,
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Files[i].CommonFileHeader.UncompressedSize);
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if ReadBytes <> integer(Files[i].CommonFileHeader.UncompressedSize) then
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Result := '';
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finally
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Decompressor.Free;
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end;
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finally
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UncompressedStream.Free;
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end;
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LoadedCRC32 := ZipCRC32(Result);
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if LoadedCRC32 <> Files[i].CommonFileHeader.Crc32 then
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// - Result := '';
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raise EZipFileCRCError.CreateFmt('CRC Error in "%s".', [Files[i].filename]);
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end;
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procedure TZipFile.SetUncompressed(i: integer; const Value: string);
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var
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Compressor: TCompressionStream;
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CompressedStream: TStringStream;
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begin
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if i > High(Files) then // exit;
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raise Exception.Create('Index out of range.');
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compressedStream := TStringStream.Create('');
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try {+}
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compressor := TcompressionStream.Create(clDefault, CompressedStream);
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try {+}
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compressor.Write(PChar(Value)^, length(Value));
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finally
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compressor.Free;
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end;
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Files[i].CompressedData := Copy(compressedStream.DataString, 3,
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length(compressedStream.DataString) - 6);
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//strip the 2 byte headers and 4 byte footers
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Files[i].LocalFileHeaderSignature := ($04034B50);
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with Files[i].CommonFileHeader do
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begin
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VersionNeededToExtract := 20;
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GeneralPurposeBitFlag := 0;
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CompressionMethod := 8;
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LastModFileTimeDate := DateTimeToFileDate(Now);
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Crc32 := ZipCRC32(Value);
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CompressedSize := length(Files[i].CompressedData);
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UncompressedSize := length(Value);
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FilenameLength := length(Files[i].filename);
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ExtraFieldLength := length(Files[i].extrafield);
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end;
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with CentralDirectory[i] do
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begin
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CentralFileHeaderSignature := $02014B50;
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VersionMadeBy := 20;
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CommonFileHeader := Files[i].CommonFileHeader;
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FileCommentLength := 0;
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DiskNumberStart := 0;
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InternalFileAttributes := 0;
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// ExternalFileAttributes := 0;
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RelativeOffsetOfLocalHeader := 0;
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filename := Files[i].filename;
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extrafield := Files[i].extrafield;
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fileComment := '';
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end;
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finally
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compressedStream.Free;
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end;
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end;
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procedure TZipFile.AddFile(const name: string; FAttribute: DWord = 0);
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begin
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SetLength(Files, High(Files) + 2);
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SetLength(CentralDirectory, length(Files));
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Files[High(Files)].filename := name;
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Files[High(Files)].CompressedData := ''; //start with an empty file
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Files[High(Files)].extrafield := '';
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Files[High(Files)].LocalFileHeaderSignature := $04034B50;
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with Files[High(Files)].CommonFileHeader do
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begin
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VersionNeededToExtract := 20;
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GeneralPurposeBitFlag := 0;
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CompressionMethod := 8;
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LastModFileTimeDate := DateTimeToFileDate(Now);
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Crc32 := 0;
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CompressedSize := 0;
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UncompressedSize := 0;
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FilenameLength := length(Files[High(Files)].filename);
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ExtraFieldLength := length(Files[High(Files)].extrafield);
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end;
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with CentralDirectory[High(Files)] do
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begin
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CentralFileHeaderSignature := $02014B50;
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VersionMadeBy := 20;
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CommonFileHeader := Files[High(Files)].CommonFileHeader;
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FileCommentLength := 0;
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DiskNumberStart := 0;
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InternalFileAttributes := 0;
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ExternalFileAttributes := FAttribute;
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RelativeOffsetOfLocalHeader := 0;
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filename := Files[High(Files)].filename;
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extrafield := Files[High(Files)].extrafield;
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fileComment := '';
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end;
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end;
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function TZipFile.GetDateTime(i: integer): TDateTime;
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begin
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if i > High(Files) then // begin Result:=0; exit; end;
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raise Exception.Create('Index out of range.');
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result := FileDateToDateTime(Files[i].CommonFileHeader.LastModFileTimeDate);
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end;
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procedure TZipFile.SetDateTime(i: integer; const Value: TDateTime);
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begin
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if i > High(Files) then //exit;
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raise Exception.Create('Index out of range.');
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Files[i].CommonFileHeader.LastModFileTimeDate := DateTimeToFileDate(Value);
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end;
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function TZipFile.GetCount: integer;
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begin
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Result := High(Files) + 1;
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end;
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function TZipFile.GetName(i: integer): string;
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begin
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Result := Files[i].filename;
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end;
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procedure TZipFile.SetName(i: integer; const Value: string);
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begin
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Files[i].filename := Value;
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end;
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{ ZipCRC32 }
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//calculates the zipfile CRC32 value from a string
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function ZipCRC32(const Data: string): longword;
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const
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CRCtable: array[0..255] of DWORD = (
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$00000000, $77073096, $EE0E612C, $990951BA, $076DC419, $706AF48F, $E963A535,
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$9E6495A3, $0EDB8832, $79DCB8A4,
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$E0D5E91E, $97D2D988, $09B64C2B, $7EB17CBD, $E7B82D07, $90BF1D91, $1DB71064,
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$6AB020F2, $F3B97148, $84BE41DE,
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$1ADAD47D, $6DDDE4EB, $F4D4B551, $83D385C7, $136C9856, $646BA8C0, $FD62F97A,
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$8A65C9EC, $14015C4F, $63066CD9,
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$FA0F3D63, $8D080DF5, $3B6E20C8, $4C69105E, $D56041E4, $A2677172, $3C03E4D1,
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$4B04D447, $D20D85FD, $A50AB56B,
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$35B5A8FA, $42B2986C, $DBBBC9D6, $ACBCF940, $32D86CE3, $45DF5C75, $DCD60DCF,
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$ABD13D59, $26D930AC, $51DE003A,
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$C8D75180, $BFD06116, $21B4F4B5, $56B3C423, $CFBA9599, $B8BDA50F, $2802B89E,
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$5F058808, $C60CD9B2, $B10BE924,
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$2F6F7C87, $58684C11, $C1611DAB, $B6662D3D, $76DC4190, $01DB7106, $98D220BC,
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$EFD5102A, $71B18589, $06B6B51F,
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$9FBFE4A5, $E8B8D433, $7807C9A2, $0F00F934, $9609A88E, $E10E9818, $7F6A0DBB,
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$086D3D2D, $91646C97, $E6635C01,
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$6B6B51F4, $1C6C6162, $856530D8, $F262004E, $6C0695ED, $1B01A57B, $8208F4C1,
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$F50FC457, $65B0D9C6, $12B7E950,
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$8BBEB8EA, $FCB9887C, $62DD1DDF, $15DA2D49, $8CD37CF3, $FBD44C65, $4DB26158,
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$3AB551CE, $A3BC0074, $D4BB30E2,
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$4ADFA541, $3DD895D7, $A4D1C46D, $D3D6F4FB, $4369E96A, $346ED9FC, $AD678846,
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$DA60B8D0, $44042D73, $33031DE5,
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$AA0A4C5F, $DD0D7CC9, $5005713C, $270241AA, $BE0B1010, $C90C2086, $5768B525,
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$206F85B3, $B966D409, $CE61E49F,
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$5EDEF90E, $29D9C998, $B0D09822, $C7D7A8B4, $59B33D17, $2EB40D81, $B7BD5C3B,
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$C0BA6CAD, $EDB88320, $9ABFB3B6,
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$03B6E20C, $74B1D29A, $EAD54739, $9DD277AF, $04DB2615, $73DC1683, $E3630B12,
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$94643B84, $0D6D6A3E, $7A6A5AA8,
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$E40ECF0B, $9309FF9D, $0A00AE27, $7D079EB1, $F00F9344, $8708A3D2, $1E01F268,
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$6906C2FE, $F762575D, $806567CB,
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$196C3671, $6E6B06E7, $FED41B76, $89D32BE0, $10DA7A5A, $67DD4ACC, $F9B9DF6F,
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$8EBEEFF9, $17B7BE43, $60B08ED5,
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$D6D6A3E8, $A1D1937E, $38D8C2C4, $4FDFF252, $D1BB67F1, $A6BC5767, $3FB506DD,
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$48B2364B, $D80D2BDA, $AF0A1B4C,
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$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);
|
|
var
|
|
i: integer;
|
|
begin
|
|
result := $FFFFFFFF;
|
|
for i := 0 to length(Data) - 1 do
|
|
result := (result shr 8) xor (CRCtable[byte(result) xor Ord(Data[i + 1])]);
|
|
result := result xor $FFFFFFFF;
|
|
end;
|
|
end.
|
|
|