I've been using ZLib functions to compress/uncompress streams in memory. In case when I try to uncompress invalid stream, it leaks memory. The following code would leak memory:
uses
Winapi.Windows, System.Classes, System.ZLib;
function DecompressStream(const AStream: TMemoryStream): Boolean;
var
ostream: TMemoryStream;
begin
ostream := TMemoryStream.Create;
try
AStream.Position := 0;
// ISSUE: Memory leak happening here
try
ZDecompressStream(AStream, ostream);
except
Exit(FALSE);
end;
AStream.Clear;
ostream.Position := 0;
AStream.CopyFrom(ostream, ostream.Size);
result := TRUE;
finally
ostream.Free;
end;
end;
var
s: TMemoryStream;
begin
ReportMemoryLeaksOnShutdown := TRUE;
s := TMemoryStream.Create;
try
DecompressStream(s);
finally
s.Free;
end;
end.
I try to decompress empty TMemoryStream here and at the end of execution it shows that memory leak happened. Testing on Delphi XE2.
Any ideas how to prevent this leak to happen, because in real world there would be a chance for my application to try to decompress invalid stream and leak the memory there.
QC: http://qc.embarcadero.com/wc/qcmain.aspx?d=120329 - claimed fixed starting with XE6