use qUncompress to uncompress data compressed by zlib with another application

themts

Hi,

I have two applications. One is written in delphi, which is compressing data with zlib.
The other one is written in c++ which should uncompress this data.

In detail:
In delphi I create a file compress it and add a 4 byte header to the compressed data:

  destStream := TFileStream.Create(SaveDialog1.FileName, fmCreate);
  destStream.WriteData(sourceStream.Size, 4);  // here I add the header for qUncompress
  sourceStream.Seek(0, soFromBeginning);
  LZip := TZCompressionStream.Create(clMax, destStream);
  LZip.CopyFrom(sourceStream, sourceStream.Size);

In QT i try to uncompress this data like this:

    QFile file("E:\\Temp\\wheels\\test.adb");
    if (!file.open(QIODevice::ReadOnly))
        return;

    QByteArray compressed = file.readAll();
    qDebug() << "Compresed=" << compressed.size();

    QByteArray uncompressed = qUncompress(compressed); // HERE I GET: qUncompress: Input data is corrupted
    qDebug() << "UnCompresed=" << uncompressed.size();

Any idea what I'm doing wrong?
Unfortunately I haven't seen the source of qUncompress yet. So don't know what it is expecting.

THX
mts

raven-worx

@themts said:

Unfortunately I haven't seen the source of qUncompress yet. So don't know what it is expecting.

Here you go

themts

Thanks, that already helped.
I just forgot to swap endian.

VRonin

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