Hello,

I'm using gzip from Apache to compress my static files (like HTML, CSS, JS etc.), and it worked fine (http://imagebin.org/303024). But, to compress the CGI content, I'm using deflate:

var
  m: TMemoryStream;
begin
  if aeDeflate in BrookGetAcceptEncodingSet(ARequest.AcceptEncoding) then
  begin
    m := TMemoryStream.Create;
    try
      with TCompressionStream.Create(clMax, m, True) do
      try
        Write(AResponse.Content[1], Length(AResponse.Content));
      finally
        Free;
      end;
      m.Seek(0, 0);
      AResponse.SetCustomHeader(fieldContentEncoding, 'deflate');
      AResponse.ContentStream := m;
      AResponse.SendContent;
     finally
      m.Free;
    end;
  end;
end;

Now I need to use gzip instead of deflate, like:

      AResponse.SetCustomHeader(fieldContentEncoding, 'gzip');

So, how to use zstream to (or other) to compress my content stream in gzip mode? I need to create a temporary gzip file (using TGZFileStream class) and load it after from my stream (m), or I can do it directly in stream?

Thank you!

No, currently you need a file, unless you are willing to duplicate the tgzstream class using an in memory-approach. (that would be a welcome addition, BTW)

Michael.

Hello,

You can use libtar and zstream units, from the LCL. Class TTarArchive creates a .tar stream and TCompressionStream compress it using gzip algorithm. Combine them to create .tar.gz archives.

Both classes can work "on the fly" without saving information on disk.

Guillermo "Ñuño" Martínez

Michael Van Canneyt wrote

No, currently you need a file, unless you are willing to duplicate the tgzstream class using an in memory-approach. (that would be a welcome addition, BTW)

TZipper has similar problem, you cannot write direct to the destination file.

Months a go I worked to modify the class to have a Stream writing directly to a zip file.

A complicated change, and I don't know if worth the effort because due to Zip format[1], I realize that only streams with support to "seek back" would be possible.

[1] The File Header is written before the compressed stream, and it must contain the compressed file size.

2014-04-01 4:12 GMT-03:00 Michael Van Canneyt :
[...]

No, currently you need a file, unless you are willing to duplicate the tgzstream class using an in memory-approach. (that would be a welcome addition, BTW)

Nice, I'll analize the possibility to implement it.