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Filter support has three goals: 1. Use the existing HDF5 filter implementations, 2. Allow filter metadata to be stored in the NumCodecs metadata format used by Zarr, 3. Allow filters to be used even when HDF5 is disabled Detailed usage directions are define in docs/filters.md. For now, the existing filter API is left in place. So filters are defined using ''nc_def_var_filter'' using the HDF5 style where the id and parameters are unsigned integers. This is a big change since filters affect many parts of the code. In the following, the terms "compressor" and "filter" and "codec" are generally used synonomously. ### Filter-Related Changes: * In order to support dynamic loading of shared filter libraries, a new library was added in the libncpoco directory; it helps to isolate dynamic loading across multiple platforms. * Provide a json parsing library for use by plugins; this is created by merging libdispatch/ncjson.c with include/ncjson.h. * Add a new _Codecs attribute to allow clients to see what codecs are being used; let ncdump -s print it out. * Provide special headers to help support compilation of HDF5 filters when HDF5 is not enabled: netcdf_filter_hdf5_build.h and netcdf_filter_build.h. * Add a number of new test to test the new nczarr filters. * Let ncgen parse _Codecs attribute, although it is ignored. ### Plugin directory changes: * Add support for the Blosc compressor; this is essential because it is the most common compressor used in Zarr datasets. This also necessitated adding a CMake FindBlosc.cmake file * Add NCZarr support for the big-four filters provided by HDF5: shuffle, fletcher32, deflate (zlib), and szip * Add a Codec defaulter (see docs/filters.md) for the big four filters. * Make plugins work with windows by properly adding __declspec declaration. ### Misc. Non-Filter Changes * Replace most uses of USE_NETCDF4 (deprecated) with USE_HDF5. * Improve support for caching * More fixes for path conversion code * Fix misc. memory leaks * Add new utility -- ncdump/ncpathcvt -- that does more or less the same thing as cygpath. * Add a number of new test to test the non-filter fixes. * Update the parsers * Convert most instances of '#ifdef _MSC_VER' to '#ifdef _WIN32'
41 lines
1.0 KiB
C
41 lines
1.0 KiB
C
#ifndef H5MISC_H
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#define H5MISC_H
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#ifdef _MSC_VER
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#ifdef DLL_EXPORT /* define when building the library */
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#define DECLSPEC __declspec(dllexport)
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#else
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#define DECLSPEC __declspec(dllimport)
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#endif
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#else
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#define DECLSPEC extern
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#endif
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/* use an integer greater than 256 to be id of the registered filter. */
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#define H5Z_FILTER_TEST 32768
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/* Define the test cases */
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typedef enum H5testcase {
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TC_NONE = 0,
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TC_ENDIAN = 1,
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TC_ODDSIZE = 2,
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TC_EXPANDED = 3,
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} H5testcase;
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/* declare the hdf5 interface */
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DECLSPEC H5PL_type_t H5PLget_plugin_type(void);
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DECLSPEC const void* H5PLget_plugin_info(void);
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DECLSPEC const H5Z_class2_t H5Z_TEST[1];
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#if 0
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/* Declare filter specific functions */
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DECLSPEC htri_t H5Z_test_can_apply(hid_t dcpl_id, hid_t type_id, hid_t space_id);
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DECLSPEC size_t H5Z_filter_test(unsigned flags,size_t cd_nelmts,const unsigned cd_values[],
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size_t nbytes,size_t *buf_size,void**buf);
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#endif
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DECLSPEC void NC_h5filterspec_fix8(void* mem0, int decode);
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#endif /*H5MISC_H*/
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