2006.02.13 16:05 "Re: [Tiff] Memory leak in TIFFOpen on Win32 ?", by Bob Friesenhahn

There are two different I/O subsystems which work in the Windows build. Besides the tif_win32 module, the tif_unix module may be used under Windows. The leak may be I/O subsystem related so it is particular to the Windows platform. Which one of these does the GnuWin32 libtiff use?

tif_win32=libtiff/tif_win32.c
tif_unix=libtiff/tif_unix.c

Bob

Just try the following code:

  #include <stdio.h>
#include <tiffio.h>

int main(int argc, char *argv[])
{
        int i;

        for (i = 10; i > 0; i --)
        {
                printf("Starting in %d ...\r", i); fflush(stdout);
                sleep(1);
        }

        for (i = 0; i < 10000; i ++)
        {
                TIFF * in = TIFFOpen("cyan.tif", "r");
                if (in) TIFFClose(in);
        }
        sleep(20);
        return 0;
}

What I notice is that memory usage increased without going down at any moment. I'm using GnuWin32 v3.8.0 self-installer package on Windows 2000, and compiled this test with MinGW. The test file can be downloaded from http://216.113.38.184/download/cyan.tif (3.9M). This is a 10800x13200 8bits monochrome tiled TIFF file, compressed with deflate method and which was generated by libTIFF itself (v3.7.3).

I also run this test on Linux and Mac OS X, with sources downloaded from ftp, and have not seen any problem.

Does someone else notice that strange side effect?

--
Thierry Pierron
Polkadots Software Inc.
2501 Dollard
Lasalle, QC
H8N 1S2 Canada

======================================
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/