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https://github.com/Unidata/netcdf-c.git
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f1506d552e
* For URL paths, the new approach essentially centralizes all information
in the URL into the "#mode=" fragment key and uses that value
to determine the dispatcher for (most) URLs.
* The new approach has the following steps:
1. canonicalize the path if it is a URL.
2. use the mode= fragment key to determine the dispatcher
3. if dispatcher still not determined, then use the mode flags
argument to nc_open/nc_create to determine the dispatcher.
4. if the path points to something readable, attempt to read the
magic number at the front, and use that to determine the dispatcher.
this case may override all previous cases.
* Misc changes.
1. Update documentation
2. Moved some unit tests from libdispatch to unit_test directory.
3. Fixed use of wrong #ifdef macro in test_filter_reg.c
[I think this may fix an previously reported esupport query].
154 lines
3.9 KiB
C
154 lines
3.9 KiB
C
/*
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* Copyright 2018, University Corporation for Atmospheric Research
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* See netcdf/COPYRIGHT file for copying and redistribution conditions.
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*/
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/**
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* @file
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* @internal
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*
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* This file contains functions that work with the NC struct. There is
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* an NC struct for every open netCDF file.
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*
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* @author Glenn Davis
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "ncdispatch.h"
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/** This is the default create format for nc_create and nc__create. */
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static int default_create_format = NC_FORMAT_CLASSIC;
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/**
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* Find the NC struct for an open file, using the ncid.
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*
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* @param ncid The ncid to find.
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* @param ncpp Pointer that gets a pointer to the NC.
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*
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* @return ::NC_NOERR No error.
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* @return ::NC_EBADID ncid not found.
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* @author Glenn Davis, Dennis Heimbigner
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*/
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int
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NC_check_id(int ncid, NC** ncpp)
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{
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NC* nc = find_in_NCList(ncid);
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if(nc == NULL) return NC_EBADID;
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if(ncpp) *ncpp = nc;
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return NC_NOERR;
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}
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/**
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* Free an NC struct and its related resources. Before this is done,
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* be sure to remove the NC from the open file list with
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* del_from_NCList().
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*
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* @param ncp Pointer to the NC struct to be freed.
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*
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* @author Glenn Davis, Dennis Heimbigner
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*/
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void
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free_NC(NC *ncp)
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{
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if(ncp == NULL)
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return;
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if(ncp->path)
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free(ncp->path);
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/* We assume caller has already cleaned up ncp->dispatchdata */
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free(ncp);
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}
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/**
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* Create and initialize a new NC struct. The ncid is assigned later.
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*
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* @param dispatcher An pointer to the NC_Dispatch table that should
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* be used by this NC.
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* @param path The name of the file.
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* @param mode The open or create mode.
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* @param model An NCmodel instance, provided by NC_infermodel().
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* @param ncpp A pointer that gets a pointer to the newlly allocacted
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* and initialized NC struct.
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*
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* @return ::NC_NOERR No error.
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* @return ::NC_ENOMEM Out of memory.
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* @author Glenn Davis, Dennis Heimbigner
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*/
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int
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new_NC(const NC_Dispatch* dispatcher, const char* path, int mode, NC** ncpp)
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{
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NC *ncp = (NC*)calloc(1,sizeof(NC));
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if(ncp == NULL) return NC_ENOMEM;
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ncp->dispatch = dispatcher;
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ncp->path = nulldup(path);
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ncp->mode = mode;
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if(ncp->path == NULL) { /* fail */
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free_NC(ncp);
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return NC_ENOMEM;
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}
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if(ncpp) {
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*ncpp = ncp;
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} else {
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free_NC(ncp);
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}
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return NC_NOERR;
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}
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/**
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* This function sets a default create flag that will be logically
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* or'd to whatever flags are passed into nc_create for all future
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* calls to nc_create.
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*
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* @param format The format that should become the default.
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* @param old_formatp Pointer that gets the previous default. Ignored
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* if NULL.
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*
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* @return ::NC_NOERR No error.
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* @return ::NC_ENOTBUILD Requested format not built with this install.
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* @return ::NC_EINVAL Invalid input.
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* @author Ed Hartnett, Dennis Heimbigner
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*/
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int
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nc_set_default_format(int format, int *old_formatp)
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{
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/* Return existing format if desired. */
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if (old_formatp)
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*old_formatp = default_create_format;
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/* Make sure only valid format is set. */
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#ifndef ENABLE_CDF5
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if (format == NC_FORMAT_CDF5)
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return NC_ENOTBUILT;
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#endif
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#ifdef USE_HDF5
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if (format != NC_FORMAT_CLASSIC && format != NC_FORMAT_64BIT_OFFSET &&
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format != NC_FORMAT_NETCDF4 && format != NC_FORMAT_NETCDF4_CLASSIC &&
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format != NC_FORMAT_CDF5)
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return NC_EINVAL;
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#else
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if (format == NC_FORMAT_NETCDF4 || format == NC_FORMAT_NETCDF4_CLASSIC)
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return NC_ENOTBUILT;
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if (format != NC_FORMAT_CLASSIC && format != NC_FORMAT_64BIT_OFFSET &&
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format != NC_FORMAT_CDF5)
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return NC_EINVAL;
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#endif
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default_create_format = format;
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return NC_NOERR;
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}
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/**
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* Get the current default format.
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*
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* @return the default format.
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* @author Ed Hartnett
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*/
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int
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nc_get_default_format(void)
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{
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return default_create_format;
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}
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