How to decompress a GZip stream?

[gabriemarcelo]

Hi! I've spent two days trying to decompress a GZip without success, sadly. I'm getting a stream through a HTTP request using Synapse tools. The stream is GZip but I cannot decompress it using TDecompressionStream of zstream unit. Could someone share with me a code for doing this? Thanks!

[KpjComp]

I believe the TDecrompressStream is just that, there is no GZIP headers etc involved.

I found this that might help ->
http://workshop.megabase.ch/en/gzfpc.html

[byungho]

Any solution?
I have same problem with synapse THttpsend.

[marcov]

Use Tgzfilestream for gzip files.  Use tdecompression stream only for zlib streams.

gzip = zlib stream prefixed with an header

[byungho]

@marcov

Thank you. TGZFileStream works fine!
Here is my test code:

Code: [Select]

  fn := 'tt.gzip';
  gzf := TGZFileStream.create(fn, gzopenread);
  ss := TStringStream.Create('');
  try
    ss.CopyFrom(gzf, 0);
    mmLog.Lines.Add(ss.DataString);
  finally
    ss.Free;
    gzf.Free;
  end;

Is there any other way to load live stream not file ?

[marcov]

Not that I know, since .gz is typically the fileformat, but tgzfilestream is very simple, and you could try to copy and adapt it.