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cloud using a variant of the Zarr protocol and storage format. This enhancement is generically referred to as "NCZarr". The data model supported by NCZarr is netcdf-4 minus the user-defined types and the String type. In this sense it is similar to the CDF-5 data model. More detailed information about enabling and using NCZarr is described in the document NUG/nczarr.md and in a [Unidata Developer's blog entry](https://www.unidata.ucar.edu/blogs/developer/en/entry/overview-of-zarr-support-in). WARNING: this code has had limited testing, so do use this version for production work. Also, performance improvements are ongoing. Note especially the following platform matrix of successful tests: Platform | Build System | S3 support ------------------------------------ Linux+gcc | Automake | yes Linux+gcc | CMake | yes Visual Studio | CMake | no Additionally, and as a consequence of the addition of NCZarr, major changes have been made to the Filter API. NOTE: NCZarr does not yet support filters, but these changes are enablers for that support in the future. Note that it is possible (probable?) that there will be some accidental reversions if the changes here did not correctly mimic the existing filter testing. In any case, previously filter ids and parameters were of type unsigned int. In order to support the more general zarr filter model, this was all converted to char*. The old HDF5-specific, unsigned int operations are still supported but they are wrappers around the new, char* based nc_filterx_XXX functions. This entailed at least the following changes: 1. Added the files libdispatch/dfilterx.c and include/ncfilter.h 2. Some filterx utilities have been moved to libdispatch/daux.c 3. A new entry, "filter_actions" was added to the NCDispatch table and the version bumped. 4. An overly complex set of structs was created to support funnelling all of the filterx operations thru a single dispatch "filter_actions" entry. 5. Move common code to from libhdf5 to libsrc4 so that it is accessible to nczarr. Changes directly related to Zarr: 1. Modified CMakeList.txt and configure.ac to support both C and C++ -- this is in support of S3 support via the awd-sdk libraries. 2. Define a size64_t type to support nczarr. 3. More reworking of libdispatch/dinfermodel.c to support zarr and to regularize the structure of the fragments section of a URL. Changes not directly related to Zarr: 1. Make client-side filter registration be conditional, with default off. 2. Hack include/nc4internal.h to make some flags added by Ed be unique: e.g. NC_CREAT, NC_INDEF, etc. 3. cleanup include/nchttp.h and libdispatch/dhttp.c. 4. Misc. changes to support compiling under Visual Studio including: * Better testing under windows for dirent.h and opendir and closedir. 5. Misc. changes to the oc2 code to support various libcurl CURLOPT flags and to centralize error reporting. 6. By default, suppress the vlen tests that have unfixed memory leaks; add option to enable them. 7. Make part of the nc_test/test_byterange.sh test be contingent on remotetest.unidata.ucar.edu being accessible. Changes Left TO-DO: 1. fix provenance code, it is too HDF5 specific.
88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/* Copyright 2018, UCAR/Unidata.
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See the COPYRIGHT file for more information.
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*/
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#ifndef NCJSON_H
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#define NCJSON_H 1
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/* Json object sorts */
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#define NCJ_UNDEF 0
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#define NCJ_STRING 1
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#define NCJ_INT 2
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#define NCJ_DOUBLE 3
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#define NCJ_BOOLEAN 4
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#define NCJ_DICT 5
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#define NCJ_ARRAY 6
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#define NCJ_NULL 7
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/* Don't bother with unions: define
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a struct to store primitive values
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as unquoted strings. Sort will
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provide more info.
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Also, this does not use a true hashmap
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but rather an envv style list where name
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and value alternate. This works under
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the assumption that we are generally
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iterating over the Dict rather than
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probing it.
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*/
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typedef struct NCjson {
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int sort;
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char* value;
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NClist* contents; /* For array|dict */
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} NCjson;
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#define NCJF_MULTILINE 1
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/* Parse */
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extern int NCJparse(const char* text, unsigned flags, NCjson** jsonp);
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/* Build */
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extern int NCJnew(int sort, NCjson** object);
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/* Convert a nul terminated string value to an NCjson object */
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extern int NCJnewstring(int sort, const char* value, NCjson** jsonp);
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/* Convert a counted string value to an NCjson object (+ nul term)*/
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extern int NCJnewstringn(int sort, size_t len, const char* value, NCjson** jsonp);
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/* Insert key-value pair into a dict object.
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key will be strdup'd.
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*/
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extern int NCJinsert(NCjson* object, char* key, NCjson* value);
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/* Insert a string value into a json Dict|Array */
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extern int NCJaddstring(NCjson* dictarray, int sort, const char* value);
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/* Get ith pair from dict */
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extern int NCJdictith(NCjson* object, size_t i, const char** keyp, NCjson** valuep);
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/* Get value for key from dict */
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extern int NCJdictget(NCjson* object, const char* key, NCjson** valuep);
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/* Append value to an array or dict object. */
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extern int NCJappend(NCjson* object, NCjson* value);
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/* Get ith element from array */
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extern int NCJarrayith(NCjson* object, size_t i, NCjson** valuep);
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/* Unparser to convert NCjson object to text in buffer */
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extern int NCJunparse(const NCjson* json, int flags, char** textp);
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/* Utilities */
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extern void NCJreclaim(NCjson*);
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extern int NCJclone(NCjson* json, NCjson** clonep); /* deep clone */
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/* dump NCjson* object */
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extern void NCJdump(const NCjson* json, int flags);
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/* Macro defined functions */
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#define NCJlength(json) \
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((json)->sort == NCJ_DICT ? (nclistlength((json)->contents)/2) \
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: ((json)->sort == NCJ_ARRAY ? (nclistlength((json)->contents)) \
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: 1))
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#endif /*NCJSON_H*/
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