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re: Issue https://github.com/Unidata/netcdf-c/issues/2656 Charlie Zender notes that *nc_open()* does not immediately detect that the given path refers to a file not in zarr format. Rather it fails later when trying to read the (meta-)data. The reason is that the Zarr format is highly decentralized. There is no easily testable magic number or superblock to look for. In effect the only way to see if a directory is Zarr is to successfully read it. It is possible to heuristically detect that a path refers to an NCZarr/Zarr file by doing a breadth-first search of the file tree starting at the given path. If the search encounters a file whose name starts with ".z", then assume it is a legitimate NCZarr/Zarr file. Of course, this test could be costly. One hopes that in practice that it is not. In addition to this fix, a corresponding test case was added. ## Other Changes re: PR https://github.com/Unidata/netcdf-c/pull/2529 There was an error under Cygwin for this PR that is fixed in this PR. The fix was to convert all *noinst_* references to *check_*.
32 lines
680 B
C
32 lines
680 B
C
/* This is part of the netCDF package.
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Copyright 2018 University Corporation for Atmospheric Research/Unidata
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See COPYRIGHT file for conditions of use.
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Test nczarr filter loading
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Author: Dennis Heimbigner
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "netcdf.h"
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#define ERR(r) {fprintf(stderr,"fail: line %d: (%d) %s\n",__LINE__,(r),nc_strerror((r)));}
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int
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main(int argc, char **argv)
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{
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int ret = NC_NOERR;
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int ncid;
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if(argc < 2) {
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fprintf(stderr,"Usage: tst_notzarr <url>\n");
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exit(1);
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}
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ret = nc_open(argv[1],NC_NETCDF4,&ncid);
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printf("%d",ret);
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if(ret == NC_NOERR) nc_close(ncid);
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exit(0);
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}
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