Hi, You could try using the H5allocate_memory and H5free_memory functions in the filter, instead of regular malloc and free.
Dan. From: Hdf-forum [mailto:[email protected]] On Behalf Of Bálint Balázs Sent: 08 January 2016 13:51 To: [email protected] Subject: [Hdf-forum] Memory corruption problems with a dynamic filter in jhdf5 Hi, I'm working on a compression filter for HDF5, but I had some problems with jhdf5 opening the filtered datasets. I managed to trace down the problem to this: the filter plugin is found, starts execution, but when it wants to free the original buffer, the program exits with a memory heap corruption error. This is a minimal version of the filter that reproduces the error: size_t H5Z_dummy_filter(unsigned int flags, size_t cd_nelmts, const unsigned int cd_values[], size_t nbytes, size_t *buf_size, void **buf) { int* outbuf = (int*)malloc(*buf_size); memcpy(outbuf, *buf, *buf_size); free(*buf); // error occurs here *buf = outbuf; return nbytes; } This (dummy) filter works from C++, from the command line with h5dump, and also with HDFView. I only had a problem when using it with Fiji, which uses the jhdf5 library (14.12.2). I compiled the dll with Visual Studio 2013 on Windows 7 64 bit, and use the 64 bit version of Java 8 with Fiji. Thanks in advance for the help! Cheers, Balint
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