Hi,
I have successfully compiled up 32 and 64-bit versions of the openEXR
libs for our 64-bit Fedora Core 4 machines.
The libraries have been working fine until I used ZIP compression when
writing a file. This caused a seg fault at the line:
file.writePixels( header.dataWindow().max.y -
header.dataWindow().min.y + 1);
Suspicious of an error else where in code I ran the program through
Valgrind to check if they were any other causes and where exactly the
problem was. There were no other errors, just this:
==8576== Invalid write of size 2
==8576== at 0x342FE0582B: (within /usr/lib64/libz.so.1.2.2.2)
==8576== by 0x342FE0478E: deflate (in /usr/lib64/libz.so.1.2.2.2)
==8576== by 0x342FE025BB: compress2 (in /usr/lib64/libz.so.1.2.2.2)
==8576== by 0x55C08B: Imf::ZipCompressor::compress(char const*, int,
int, char const*&) (in /u/jbc/tools/bin/Linux64/exrwriter)
==8576== by 0x5557B7: Imf::OutputFile::writePixels(int) (in
/u/jbc/tools/bin/Linux64/exrwriter)
If I change the line
header.compression() = Imf::ZIP_COMPRESSION;
to any other compression (except ZIPS) or no compression everything
works fine.
I then decided to check what version of the zlib came on the 32-bit
RedHat9 machines machines which worked fine with no seg fault (1.1.4).
First off I tried upping the zlib version to 1.2.3 (the latest release)
but still the seg fault occured.
I then rolled back the version of zlib on our Fedora Core 4 machines to
1.1.4 and the seg fault stopped. I found that rolling back both the
32-bit and 64-bit versions of the zlib library fixed both the 32-bit and
64-bit verions of the program on the Fedora Core 4 machines.
I just wondered if this is a known issue or whether anyone else has any
experience of such problems? Is there something I need to do to be able
to use the later zlib version?
Thanks,
Jeff Clifford.
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