Crosspost: Compressed Data in Datei auslesen

[toms]

Hallo,

Vielleicht gibt die UnitIdCompressionIntercept.pas ein wenig Aufschluss darüber, wie inflateInit etc. zu verwenden ist oder die ZlibEx im Anhang, insb:

Delphi-Quellcode:

procedure ZDecompress(const inBuffer: Pointer; inSize: Integer;
  out outBuffer: Pointer; out outSize: Integer; outEstimate: Integer);
var
  zstream: TZStreamRec;
  delta: Integer;
begin
  FillChar(zstream, SizeOf(TZStreamRec), 0);

  delta := (inSize + 255) and not 255;

  if outEstimate = 0 then outSize := delta
  else outSize := outEstimate;

  GetMem(outBuffer, outSize);

  try
    zstream.next_in := inBuffer;
    zstream.avail_in := inSize;
    zstream.next_out := outBuffer;
    zstream.avail_out := outSize;

    ZDecompressCheck(InflateInit(zstream));

    try
      while ZDecompressCheck(inflate(zstream, Z_NO_FLUSH)) <> Z_STREAM_END do
      begin
        Inc(outSize, delta);
        ReallocMem(outBuffer, outSize);

        zstream.next_out := PChar(Integer(outBuffer) + zstream.total_out);
        zstream.avail_out := delta;
      end;
    finally
      ZDecompressCheck(inflateEnd(zstream));
    end;

    ReallocMem(outBuffer, zstream.total_out);
    outSize := zstream.total_out;
  except
    FreeMem(outBuffer);
    raise;
  end;
end;