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3ffe7be446
re: Discussion https://github.com/Unidata/netcdf-c/discussions/2214 The primary change is to support so-called "standard filters". A standard filter is one that is defined by the following netcdf-c API: ```` int nc_def_var_XXX(int ncid, int varid, size_t nparams, unsigned* params); int nc_inq_var_XXXX(int ncid, int varid, int* usefilterp, unsigned* params); ```` So for example, zstandard would be a standard filter by defining the functions *nc_def_var_zstandard* and *nc_inq_var_zstandard*. In order to define these functions, we need a new dispatch function: ```` int nc_inq_filter_avail(int ncid, unsigned filterid); ```` This function, combined with the existing filter API can be used to implement arbitrary standard filters using a simple code pattern. Note that I would have preferred that this function return a list of all available filters, but HDF5 does not support that functionality. So this PR implements the dispatch function and implements the following standard functions: + bzip2 + zstandard + blosc Specific test cases are also provided for HDF5 and NCZarr. Over time, other specific standard filters will be defined. ## Primary Changes * Add nc_inq_filter_avail() to netcdf-c API. * Add standard filter implementations to test use of *nc_inq_filter_avail*. * Bump the dispatch table version number and add to all the relevant dispatch tables (libsrc, libsrcp, etc). * Create a program to invoke nc_inq_filter_avail so that it is accessible to shell scripts. * Cleanup szip support to properly support szip when HDF5 is disabled. This involves detecting libsz separately from testing if HDF5 supports szip. * Integrate shuffle and fletcher32 into the existing filter API. This means that, for example, nc_def_var_fletcher32 is now a wrapper around nc_def_var_filter. * Extend the Codec defaulting to allow multiple default shared libraries. ## Misc. Changes * Modify configure.ac/CMakeLists.txt to look for the relevant libraries implementing standard filters. * Modify libnetcdf.settings to list available standard filters (including deflate and szip). * Add CMake test modules to locate libbz2 and libzstd. * Cleanup the HDF5 memory manager function use in the plugins. * remove unused file include//ncfilter.h * remove tests for the HDF5 memory operations e.g. H5allocate_memory. * Add flag to ncdump to force use of _Filter instead of _Deflate or _Shuffle or _Fletcher32. Used for testing.
50 lines
1.9 KiB
C
50 lines
1.9 KiB
C
/* Copyright 2018-2018 University Corporation for Atmospheric
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Research/Unidata. */
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/**
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* Header file for dhttp.c
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* @author Dennis Heimbigner
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*/
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#ifndef NCHTTP_H
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#define NCHTTP_H
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typedef enum HTTPMETHOD {
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HTTPNONE=0, HTTPGET=1, HTTPPUT=2, HTTPPOST=3, HTTPHEAD=4, HTTPDELETE=5
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} HTTPMETHOD;
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struct CURL; /* Forward */
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typedef struct NC_HTTP_STATE {
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struct CURL* curl;
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long httpcode;
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struct Response {
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NClist* headset; /* which headers to capture */
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NClist* headers; /* Set of captured headers */
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NCbytes* buf; /* response content; call owns; do not free */
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} response;
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struct Request {
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HTTPMETHOD method;
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size_t payloadsize;
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void* payload; /* caller owns; do not free */
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size_t payloadpos;
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NClist* headers;
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} request;
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char errbuf[1024]; /* assert(CURL_ERROR_SIZE <= 1024) */
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} NC_HTTP_STATE;
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extern int nc_http_init(NC_HTTP_STATE** state);
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extern int nc_http_init_verbose(NC_HTTP_STATE** state, int verbose);
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extern int nc_http_size(NC_HTTP_STATE* state, const char* url, long long* sizep);
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extern int nc_http_read(NC_HTTP_STATE* state, const char* url, size64_t start, size64_t count, NCbytes* buf);
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extern int nc_http_write(NC_HTTP_STATE* state, const char* url, NCbytes* payload);
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extern int nc_http_close(NC_HTTP_STATE* state);
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extern int nc_http_reset(NC_HTTP_STATE* state);
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extern int nc_http_set_method(NC_HTTP_STATE* state, HTTPMETHOD method);
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extern int nc_http_set_response(NC_HTTP_STATE* state, NCbytes* buf);
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extern int nc_http_set_payload(NC_HTTP_STATE* state, size_t len, void* payload);
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extern int nc_http_response_headset(NC_HTTP_STATE* state, const NClist* headers); /* Set of headers to capture */
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extern int nc_http_response_headers(NC_HTTP_STATE* state, NClist** headersp); /* set of captured headers */
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extern int nc_http_request_setheaders(NC_HTTP_STATE* state, const NClist* headers); /* set of extra request headers */
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#endif /*NCHTTP_H*/
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