Zlibar

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About

zlibar is a unit that contains components to create a single compressed file archive that contains many files. It uses paszlib that is included with FreePascal so there are no external library requirements

The two main components are :

• TZlibWriteArchive - Used to create an archive
• TZlibReadArchive - Used to read the archive and extract it's files

Features of TZlibWriteArchive :

• Create the Archive file in a stream, allowing you to save it to a file or do something else creative with it
• Each file in the archive is stored with a MD5 checksum
• Each file can be stored with a relative path
• Contains progress callbacks to inform the program of the current file and all files progress

Features of TZlibReadArchive :

• Loads the archive from a TStream.
• Contains a progress callback to inform the program of the extraction progress
• Files in the archive are extractable by an index number and are extracted to a TStream

The download contains a demo program, and the unit. Also a package file.

Although not tested, it should work on any platform.

Changes in versions :

0.2.3 (19/02/2012)

• Fixed compilation with newer versions of fpc

0.2.2

• LCL requirement removed
• FPC version 2.0.4 (or a recent development version) required.
• Compatible with FPC 2.0.4 ( go figure.... ;)

0.2.1

• archives should work across different endian machines now.
• fixed bad memory corruption bug
• now requires LCL for endian safeness

Author

Andrew Haines

License

zlibar.pas is distributed with the same modified LGPL as the LCL, so it is possible to use it in proprietary programs without disclosing your source.

Download

Releases

The latest stable release can be found on the Lazarus CCR Files page.

Subversion

zlibar is available in the lazarus code and component repository since version 0.2.3:

 svn co https://lazarus-ccr.svn.sourceforge.net/svnroot/lazarus-ccr/components/zlibar zlibar

Dependencies / System Requirements

• Free Pascal
• Demo Program requires Lazarus

Issues:

• Tested on Linux.
• Needs testing on Windows. Confirmed working on Windows
  --Eyecreate 03:22, 23 February 2007 (CET)

Version 0.2.2 will not compile on newer versions of fpc (>2.4.2) Use a version newer than 0.2.2 or subversion.

Usage

Add the unit "zlibar" to your uses section.

TZLibWriteArchive

Example:

var
  Zar: TZlibWriteArchive;
  Stream: TMemoryStream;
  X: Integer;
begin    
  Stream := TMemoryStream.Create;
  Zar := TZlibWriteArchive.Create;    
  Zar.OutStream := Stream;
  
  Zar.InputFiles.Add('/path/to/MyFileName1');
  Zar.InputFiles.Add('/path/to/MyFileName2');

  Zar.CreateArchive;
  
  Stream.SaveToFile('MySavedFileName');
  Zar.Free;
  Stream.Free;
end;

TZlibReadArchive

Example:

var
  ArchStream: TMemoryStream;
  FileStream: TMemoryStream;
  ZReadArc: TZlibReadArchive;
  X: Integer;
  DestPath: String;
begin
  ArchStream := TMemoryStream.Create;
  FileStream := TmemoryStream.Create;
   
  ArchStream.LoadFromFile('ArchiveFileName');
  ZReadArc:= TZlibReadArchive.Create(ArchStream);
  DestPath := '/Some/Path';
  for X := 0 to ZReadArc.Count -1 do begin    
    ZReadArc.ExtractFileToStream(X, FileStream);
    FileStream.SaveToFile(DestPath+ZReadArc.FilesInArchive[X].FilePath+'/'+ZReadArc.FilesInArchive[X].FIleName);
    FileStream.Position := 0;
    FileStream.Size := 0;
  end;
  ZReadArc.Free;
  ArchStream.Free;
  FileStream.Free;  
end;