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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'
71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/* Copyright 2018, UCAR/Unidata and OPeNDAP, Inc.
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See the COPYRIGHT file for more information. */
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#ifndef NCLIST_H
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#define NCLIST_H 1
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#include "ncexternl.h"
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/* Define the type of the elements in the list*/
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#if defined(_CPLUSPLUS_) || defined(__CPLUSPLUS__)
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extern "C" {
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#endif
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EXTERNL int nclistnull(void*);
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typedef struct NClist {
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size_t alloc;
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size_t length;
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void** content;
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} NClist;
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EXTERNL NClist* nclistnew(void);
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EXTERNL int nclistfree(NClist*);
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EXTERNL int nclistfreeall(NClist*);
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EXTERNL int nclistclearall(NClist*);
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EXTERNL int nclistsetalloc(NClist*,size_t);
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EXTERNL int nclistsetlength(NClist*,size_t);
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/* Set the ith element; will overwrite previous contents; expand if needed */
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EXTERNL int nclistset(NClist*,size_t,void*);
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/* Get value at position i */
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EXTERNL void* nclistget(NClist*,size_t);/* Return the ith element of l */
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/* Insert at position i; will push up elements i..|seq|. */
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EXTERNL int nclistinsert(NClist*,size_t,void*);
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/* Remove element at position i; will move higher elements down */
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EXTERNL void* nclistremove(NClist* l, size_t i);
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/* Tail operations */
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EXTERNL int nclistpush(NClist*,const void*); /* Add at Tail */
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EXTERNL void* nclistpop(NClist*);
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EXTERNL void* nclisttop(NClist*);
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/* Look for pointer match */
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EXTERNL int nclistcontains(NClist*, void*);
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/* Look for value match as string */
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EXTERNL int nclistmatch(NClist*, const char*, int casesensistive);
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/* Remove element by value; only removes first encountered */
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EXTERNL int nclistelemremove(NClist* l, void* elem);
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/* remove duplicates */
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EXTERNL int nclistunique(NClist*);
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/* Create a clone of a list; if deep, then assume it is a list of strings */
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EXTERNL NClist* nclistclone(NClist*, int deep);
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EXTERNL void* nclistextract(NClist*);
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/* Following are always "in-lined"*/
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#define nclistclear(l) nclistsetlength((l),0)
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#define nclistextend(l,len) nclistsetalloc((l),(len)+(l->alloc))
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#define nclistcontents(l) ((l)==NULL?NULL:(l)->content)
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#define nclistlength(l) ((l)==NULL?0:(l)->length)
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#if defined(_CPLUSPLUS_) || defined(__CPLUSPLUS__)
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}
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#endif
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#endif /*NCLIST_H*/
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