2006.01.31 10:17 "[Tiff] RowsPerStrip", by Harsha

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?



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);

        for (i = 0; i < 10000; i ++)
                TIFF * in = TIFFOpen("cyan.tif", "r");
                if (in) TIFFClose(in);
        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 (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/