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problem opening file with Chinese chars in path #1666

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jswhit opened this issue Mar 10, 2020 · 6 comments · Fixed by #1668
Closed

problem opening file with Chinese chars in path #1666

jswhit opened this issue Mar 10, 2020 · 6 comments · Fixed by #1668

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@jswhit
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jswhit commented Mar 10, 2020

Reported in Unidata/netcdf4-python#997

Consider this test script:

import netCDF4, os
dirpath1 =\
b'\xe6\xb5\xb7\xe6\xb4\x8b\xe6\x8e\xa2\xe6\xb5\x8b\xe6\x8a\x80\xe6\x9c\xaf\xe4\xb8\x93\xe9\xa2\x98\xe5\xae\x9e\xe9\xaa\x8c'.decode('utf-8')
dirpath2 =\
b'\xe4\xb8\x93\xe9\xa2\x98\xe5\xae\x9e\xe9\xaa\x8c\xe5\x85\xab'.decode('utf-8')
dirpath = os.path.join(dirpath1,dirpath2)
os.makedirs(dirpath,exist_ok=True)
filename=os.path.join(dirpath,'V2019151040600.L2_SNPP_OC.nc')
print(filename)
nc = netCDF4.Dataset(filename,'w')
nc.filename = filename
nc.close()
nc = netCDF4.Dataset(filename)

The file is created, but a Permission denied error is raised when the file is read back in.
The file can be read via h5dump or h5py, but ncdump cannot see it (No such file or directory).

h5dump 海洋探测技术专题实验/专题实验八/V2019151040600.L2_SNPP_OC.nc works
ncdump 海洋探测技术专题实验/专题实验八/V2019151040600.L2_SNPP_OC.nc does not.

@DennisHeimbigner
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This issue came up once before (in esupport, I think). I do not recall the
resolution, so let me see if I can find it.

@DennisHeimbigner
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Cannot find it. Does anyone else recall the previous resolution?

@DennisHeimbigner
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Found the problem (or at least one of them).
The path handling code in NC_create and NC_open (dfile.c)
is improperly handling whitespace. Will have fix up shortly.

@DennisHeimbigner
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I am uploading a revised libdispatch/dfile.c
Can someone see if it fixes the problem for them?
dfile.zip

@jswhit
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jswhit commented Mar 11, 2020

Dennis - that does seem to fix it.

@DennisHeimbigner
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ok, I will submit the PR for it.

DennisHeimbigner added a commit to DennisHeimbigner/netcdf-c that referenced this issue Mar 11, 2020
re: issue Unidata#1666

The code in NC_open and NC_create (in dfile.c)
was using improperly testing for leading whitespace chars.
It was treating UTF-8 as whitespace.

Fix is to do tests using unsigned char.
clrpackages pushed a commit to clearlinux-pkgs/netcdf that referenced this issue Apr 8, 2020
Ben Boeckel (1):
      windows: detect Windows using the correct define name

Dennis Heimbigner (20):
      Avoid spurious test failures when servers fail.
      Guard nctestserver.h against multiple inclusions
      Forgot to create pingurl4.c for Cmake
      Make the dap4 code resistant to various server errors.
      Add support for CURLOPT_CONNECTTIMEOUT
      Add support for multiple filters per variable.
      Fix conflicts with master
      fix memory leak
      force rebuild
      fix bad edit
      fix parallel filter error discovered by Hartnett
      Make utilities support NC_COMPACT
      Fix typo
      Fix Filters x compact
      fix references to var->deflate'
      fix memory allocation failure in hdf5var.c
      fix error in tst_h_vars.c
      Make scalar X filter return an error instead of ignoring it
      Fix open/create of UTF8 names
      Force error report when DAP gets error response.

Edward Hartnett (230):
      update of bm_file to prevent integer overflows on very big files
      improved docs for cache functions, added libhdf5/hdf5cache.c to Doxyfile.in, added benchmark program for cache settings
      updated users guide
      update release notes
      new cache default in cmake build
      took option out of configure.ac
      now always relax!
      changed cmake build to only allow relaxed coord builds
      removed non-relaxed coord bounds from test code
      took RELAX_COORD_BOUND out of libsrc code
      further removal of RELAX_COORD_BOUNDS macro
      further removal of RELAX_COORD_BOUND macro
      cleanup of RELAX_COORD_BOUND in cmake build
      removed last vestiges of RELAX_COORD_BOUND option, which is now always on
      added test for opening HDF5 file without creation ordering
      comment to explain
      moved udata.grps initialization to avoid memory problem on BAIL
      changed test filename to one that will be cleaned
      tests and fix for multiple unlimited dim bug
      more tests
      starting to support compact storage
      whitespace cleanup of test
      adding test for compact storage
      more test development
      more test development
      got compact storage test working
      got compact storage test working
      updated docs for NC_COMPACT
      further test development for compact storage
      more testing for compact vars
      more testing for compact vars
      more testing for compact vars
      better documentation for compact storage
      fixed comment
      better handling of var cache for parallel builds
      allow parallel writes to use zlib
      allowing parallel write of gzipped data, plus added test
      stop running tst_mode test
      adding another zlib parallel I/O test
      documentation updates
      now check that HDF5 version supports parallel zlib
      added new tests to cmake, also additional test development
      adjusted tst_parallel_zlib to HDF5 version flag
      adjusted tst_parallel_zlib2 to HDF5 version flag
      now also can set fletcher32 in parallel I/O writes
      swtich to collective access when filters are applied
      better documentation
      more documentaiton
      now prevent attempt to change to independent access when deflate, shuffle, or fletcher32 filters are in use
      even more documentation updates
      fixed include issue
      fixing for non-parallel builds
      getting parallel I/O with zlib working in cmake builds
      more testing
      more tests
      more testing
      more test development
      more test development
      changed name of macro
      restored tst_mode tests
      fixed comments
      fixed comments
      removed unneeded delete
      first stab at re-adding nc_def_var_szip()
      added test for when szip is missing from HDF5
      changed error code in nc_def_var_szip() to NC_EFILTER
      now checking for proper error from nc_def_var_szip() when szip is not present
      clean up
      whitespace clean up
      more szip tests
      more szip testing
      whitespace cleanup
      now using members in NC_VAR_INFO_T to hold szip info
      starting to add parallel tests
      parallel szip test
      parallel szip test
      parallel szip test
      parallel szip test
      checking sziped data in parallel I/O test
      fixed deflate_level comment
      added SZIP to libnetcdf.settings.in
      moved nc_def_var_szip  prototype to netcdf_filter.h
      fixed doc formatting issue
      added to libnetcdf.settings and netcdf_meta.h
      adding NC_HAS_SZIP_WRITE and NC_HAS_PAR_FILTERS to cmake build
      fixing running of parallel filter tests only when parallel filters are present
      fixed shell test for par filters
      start using par filters in HDF5-1.10.3
      move AM_CONDITIONAL outside if-statement body
      switch cmake build to check for func H5Dread_chunk to detect 1.10.3 or later
      fixed compile error
      updated RELEASE_NOTES to include results of recent PR merges
      fixed distclean target in dap4_test
      configure now confirms that HDF5 was built with zlib
      detecting lack of zlib in cmake build
      moved cmake detection of lack of zlib to be with other HDF5 stuff
      fixed cmake check for zlib in HDF5 library
      fixed libnetcdf.settings output in cmake build wrt szip
      more HDF5 tests for szip functionality
      testing nc_def_var_szip when szip has not been built into HDF5
      more tests
      more documentation for nc_inq_var_szip
      fix problem with pre-enddef call to nc_inq_var_szip()
      now remember szip setting in filter fields
      test nc_inq_var_szip after call to nc_def_var_szip, but before enddef
      use nc_def_var_filter in nc_def_var_szip
      rely completely on nc_def_var_filter for setting szip
      adding szip test to tst_parallel_zlib2.c
      more of szip test in tst_parallel_zlib2.c
      now parallel szip test working in tst_parallel_zlib2.c
      moved tst_parallel_zlib2 to tst_parallel_compress
      not return 0 for parameters to nc_inq_var_szip if szip is not turned on for var
      renamed var for clarity
      turned on some previously failing tests for nc_inq_var_szip()
      documentation improvements for nc_inq_var_szip()
      fixed call to AC_SUBST inside an if-endif in configure.ac
      fix error in makefile building tst_parallel_compress.c
      removed unnecessary library check for szip library, cleaned up comments
      adding test for zlib+szip in HDF5
      finished test for zlib+szip in HDF5
      removed redundant test
      removed unneeded var
      disallow szip if zlib already in use
      disallow zlib if szip already in use
      updated documentation
      starting to add test for szip param values
      adding test of different szip option mask settings
      test development for different szip option mask settings
      checking for some bad pixels_per_block values for szip
      now check number of elements in chunk against pixels_per_block for szip compression
      test more values for szip
      test more values for szip
      fixed docs, removed unneeded defines in test
      move nc_def_var_szip function so it will appear in the documentation
      updated release notes
      trying to fix windows build
      whitespace and comment cleanup
      uncommented part of test code
      moving run_par_tests.sh to run_par_tests.sh.in
      now allow substitution of different mpi launcher in h5_test/run_par_tests.sh
      cleanup of nc_test4/run_par_test.sh.in
      added HDF5 parallel test to CMake build
      now causing cmake build to create h5_test/run_par_tests.sh from h5_test/run_par_tests.sh.in
      updated RELEASE_NOTES
      more uncommented test code and whitespace cleanup
      raised NC_MAX_HDF4_NAME length to NC_MAX_NAME
      updated release notes
      adding tst_mem1.c
      now detect memory leak open/closing files with tst_mem1.c
      further development of mem testing program
      turned down number of runs
      fix for memory leak due to HDF5 types
      only close non-zero typeids
      edited release notes
      added version to dispatch table
      whitespace cleanup
      better documentation
      now check the dispatch table version number
      whitespace cleanup of tst_udf.c
      now test that bad version number in dispatch table causes rejection
      now test that bad version number in dispatch table causes rejection
      changed version of dispatch table to 2 in configure.ac
      updated release notes
      added more documentation to nc_def_var_filter()
      added in decl for num_obj for large file builds
      whitespace cleanup
      making room for new tests
      adding test
      adding test
      testing two unlimited dims
      testing two unlimited dims
      testing two unlimited dims
      testing two unlimited dims
      adding 3d test
      adding 3d test
      better 3d unlimited testing
      added another var to 2D test
      improving 3d test
      checking 2nd var data in 3D test
      switched to vara functions in 3D test
      checking 3D file again after close
      more checking in 3D test
      added some testing for compact vars
      updated documentation of nc_inq_var_chunking()
      adding more test for compact var
      whitespace cleanup of tst_h_vars2.c
      refurbishing old test that was commented out
      fixed warnings
      fixed comments
      test demonstrating HDF5 use of compact scalar dataset
      more tests for compact storage
      more tests for storage, changed var names to reflect stortage
      include storage in rec_print_metadata() output
      more HDF5 testing of scalar compact variable
      all tests passing but compact storage for scalars not being properly written in file yet
      changed metadata logging to reflect unknown storage if var metadata has not yet be read
      fixed problem with scalar compact
      updated docs on nc_def_var_chunking to describe behavior of scalars
      fixed large file build issue
      fixed warning
      fixed szip test error in tst_parallel5.c
      documentation improvements for nc_var_par_access()
      updated docs for nc_def_var_chunking WRT scalars
      updated release notes
      more documentation for NC_VAR_INFO_T in nc4internal.h
      fixed tst_mode to not attempt to set filters on scalars
      now return NC_EINVAL on attempt to set chunking on scalar var
      clarified release notes
      updated documentation
      removed commented-out code
      added storage to NC_VAR_INFO_T, removed unneeded test code
      starting to use storage field when opening file
      now setting storage field when setting var storage
      using storage in hdf5filter.c
      using storage field in nc4var.c
      continuing to switch to storage field
      more use of storage field
      now using storage everywhere
      stop setting contiguous/compact fields at file open
      stop setting contiguous field in hdf5filter.c
      stop setting contiguous field in nc4hdf5.c
      fixed HDF4 use of contiguous
      less use of contiguous/compact field
      final removal of fields contiguous/compact from NC_VAR_INFO_T
      whitespace cleanup
      updated release notes
      change to trigger CI
      now pass 0 for deflate_level if deflate not in use
      updated documentation of nc_inq_var_deflate() to describe behavior of deflate_level when deflate not in use
      fixed documentation of cache int functions

Greg Sjaardema (2):
      Add missing ERR macro on tests
      Better finding of the hdf5.h include path

James Sharpe (1):
      Call find_package(MPI) to locate MPI paths and link to libdispatch if required

Jennifer Oxelson (1):
      changed/removed references to jetstream remotetest instance.

M. Scot Breitenfeld (1):
      Updated H5Oget_info* and H5Oinfo_t to be compatible with HDF5 1.12.0.

Magnus Ulimoen (1):
      add file to .gitignore

Ward Fisher (44):
      Updated one of the static software pages.
      Started to rough in ctest-based scripts.
      Started to rough in ctest-based scripts.
      Added project name to ctest_basic ctest script.
      Refactoring ctest script.
      Added script for mpicc Experimental builds.  Renamed serial Experimental script to reflect that fact.
      Correct a cmake linking error discovered when working in a mips qemu environment.
      Correct a typo.
      Cleaned up an 'uninitialized variable' issue reported by static analysis. Minor fix, rolling in to this PR rather than spinning up a separate one.
      Fixing the typo I introduced when fixing the typo.
      Disable byterange tests if DAP remote tests are disabled.
      Turned off hdf4 explicitly when no NetCDF-4 support is available.
      Added namespace prefix to netCDF_LIBRARIES in CMake in support of Unidata/netcdf-c#1607
      Cleaned up szlib status message in libnetcdf.settings.
      Correct typo.
      Tweaked configure.ac
      Removed deprecated functions from doxygen template file
      Initial copy of files into NUG directory.
      Some initial reorganization.
      Shuffling NUG and documentation.
      Moved tag files into the subsequent html directory.
      Removed obsolete tags.
      Modified doxygen to look at URL instead of local files.
      Removed old guide.md file.
      Moved NUG related files in to NUG directory.
      Corrected tag for szip write support output in libnetcdf.settings.in
      Cleaning up distcheck.
      Added a ctest script with DAP tests enabled.
      Adding test in support of https://github.com/Unidata/netcdf-c/pulls/1668
      Syntax fix
      Added cleanup to test script.
      Typo in Makefile.am
      Permissions error on unicode directory test script.
      Fix typo for distcheck.
      Updated release notes in support of Unidata/netcdf-c#1666, Unidata/netcdf-c#1668 and Unidata/netcdf-c#1669
      Updated expected release date.
      Updated so version info in line with guidelines found at https://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
      Updated soversion, bump to next development version in preparation of upstream merge back into master from 4.7.4 wellspring.
      Modified version numbers to reflect 4.7.4 release.
      Added maintainer mode for general distribution.
      Added autoconf generated files for a stand-alone release.
      Added generated files for a stand-alone release.
      Updated Release Notes.
      Pedantically bumped release date, rolling v4.7.4 release now.

edwardhartnett (4):
      added rest of unit tests to cmake build
      trying unit tests on windows
      turned off unit tests for windows
      turned off cmake build in travis
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this issue Jun 3, 2023
Release Notes       {#RELEASE_NOTES}
=============

\brief Release notes file for the netcdf-c package.

This file contains a high-level description of this package's
evolution. Releases are in reverse chronological order (most recent
first). Note that, as of netcdf 4.2, the `netcdf-c++` and
`netcdf-fortran` libraries have been separated into their own
libraries.

## 4.9.3 - TBD

## 4.9.2 - March 14, 2023

This is the maintenance release which adds support for HDF5 version
1.14.0, in addition to a handful of other changes and bugfixes.

* Fix 'make distcheck' error in run_interop.sh. See [Github
  #????](https://github.com/Unidata/netcdf-c/pull/????).
* Update `nc-config` to remove inclusion from automatically-detected
  `nf-config` and `ncxx-config` files, as the wrong files could be
  included in the output.  This is in support of [GitHub
  #2274](Unidata/netcdf-c#2274).

* Update H5FDhttp.[ch] to work with HDF5 version 1.13.2 and later. See
  [Github #2635](Unidata/netcdf-c#2635).

* [Bug Fix] Update DAP code to enable CURLOPT_ACCEPT_ENCODING by
  default. See [Github
  #2630](Unidata/netcdf-c#2630).

* [Bug Fix] Fix byterange failures for certain URLs. See [Github
  #2649](Unidata/netcdf-c#2649).

* [Bug Fix] Fix 'make distcheck' error in run_interop.sh. See [Github
  #2631](Unidata/netcdf-c#2631).

* [Enhancement] Update `nc-config` to remove inclusion from
  automatically-detected `nf-config` and `ncxx-config` files, as the
  wrong files could be included in the output.  This is in support of
  [GitHub #2274](Unidata/netcdf-c#2274).

* [Enhancement] Update H5FDhttp.[ch] to work with HDF5 version
  1.14.0. See [Github
  #2615](Unidata/netcdf-c#2615).

## 4.9.1 - February 2, 2023

## Known Issues

* A test in the `main` branch of `netcdf-cxx4` is broken by this rc; this will
  bear further investigation, but not being treated as a roadblock for the
  release candidate.

* The new document, `netcdf-c/docs/filter_quickstart.md` is in
  rough-draft form.

* Race conditions exist in some of the tests when run concurrently with large
  numbers of processors

## What's Changed from v4.9.0 (automatically generated)

* Fix nc_def_var_fletcher32 operation by \@DennisHeimbigner in
  Unidata/netcdf-c#2403

* Merge relevant info updates back into `main` by \@WardF in
  Unidata/netcdf-c#2387

* Add manual GitHub actions triggers for the tests. by \@WardF in
  Unidata/netcdf-c#2404

* Use env variable USERPROFILE instead of HOME for windows and mingw. by
  \@DennisHeimbigner in Unidata/netcdf-c#2405

* Make public a limited API for programmatic access to internal .rc tables by
  \@DennisHeimbigner in Unidata/netcdf-c#2408

* Fix typo in CMakeLists.txt by \@georgthegreat in
  Unidata/netcdf-c#2412

* Fix choice of HOME dir by \@DennisHeimbigner in
  Unidata/netcdf-c#2416

* Check for libxml2 development files by \@WardF in
  Unidata/netcdf-c#2417

* Updating Doxyfile.in with doxygen-1.8.17, turned on WARN_AS_ERROR, added
  doxygen build to CI run by \@edwardhartnett in
  Unidata/netcdf-c#2377

* updated release notes by \@edwardhartnett in
  Unidata/netcdf-c#2392

* increase read block size from 1 KB to 4 MB by \@wkliao in
  Unidata/netcdf-c#2319

* fixed RELEASE_NOTES.md by \@edwardhartnett in
  Unidata/netcdf-c#2423

* Fix pnetcdf tests in cmake by \@WardF in
  Unidata/netcdf-c#2437

* Updated CMakeLists to avoid corner case cmake error by \@WardF in
  Unidata/netcdf-c#2438

* Add `--disable-quantize` to configure by \@WardF in
  Unidata/netcdf-c#2439

* Fix the way CMake handles -DPLUGIN_INSTALL_DIR by \@DennisHeimbigner in
  Unidata/netcdf-c#2430

* fix and test quantize mode for NC_CLASSIC_MODEL by \@edwardhartnett in
  Unidata/netcdf-c#2445

* Guard _declspec(dllexport) in support of #2446 by \@WardF in
  Unidata/netcdf-c#2460

* Ensure that netcdf_json.h does not interfere with ncjson. by
  \@DennisHeimbigner in Unidata/netcdf-c#2448

* Prevent cmake writing to source dir by \@magnusuMET in
  Unidata/netcdf-c#2463

* more quantize testing and adding pre-processor constant NC_MAX_FILENAME to
  nc_tests.h by \@edwardhartnett in
  Unidata/netcdf-c#2457

* Provide a default enum const when fill value does not match any enum
  constant by \@DennisHeimbigner in
  Unidata/netcdf-c#2462

* Fix support for reading arrays of HDF5 fixed size strings by
  \@DennisHeimbigner in Unidata/netcdf-c#2466

* fix musl build by \@magnusuMET in
  Unidata/netcdf-c#1701

* Fix AWS SDK linking errors by \@dzenanz in
  Unidata/netcdf-c#2470

* Address jump-misses-init issue. by \@WardF in
  Unidata/netcdf-c#2488

* Remove stray merge conflict markers by \@WardF in
  Unidata/netcdf-c#2493

* Add support for Zarr string type to NCZarr by \@DennisHeimbigner in
  Unidata/netcdf-c#2492

* Fix some problems with PR 2492 by \@DennisHeimbigner in
  Unidata/netcdf-c#2497

* Fix some bugs in the blosc filter wrapper by \@DennisHeimbigner in
  Unidata/netcdf-c#2461

* Add option to control accessing external servers by \@DennisHeimbigner in
  Unidata/netcdf-c#2491

* Changed attribute case in documentation by \@WardF in
  Unidata/netcdf-c#2482

* Adding all-error-codes.md back in to distribution documentation. by \@WardF in
  Unidata/netcdf-c#2501

* Update hdf5 version in github actions. by \@WardF in
  Unidata/netcdf-c#2504

* Minor update to doxygen function documentation by \@gsjaardema in
  Unidata/netcdf-c#2451

* Fix some addtional errors in NCZarr by \@DennisHeimbigner in
  Unidata/netcdf-c#2503

* Cleanup szip handling some more by \@DennisHeimbigner in
  Unidata/netcdf-c#2421

* Check for zstd development headers in autotools by \@WardF in
  Unidata/netcdf-c#2507

* Add new options to nc-config by \@WardF in
  Unidata/netcdf-c#2509

* Cleanup built test sources in nczarr_test by \@DennisHeimbigner in
  Unidata/netcdf-c#2508

* Fix inconsistency in netcdf_meta.h by \@WardF in
  Unidata/netcdf-c#2512

* Small fix in nc-config.in by \@WardF in
  Unidata/netcdf-c#2513

* For loop initial declarations are only allowed in C99 mode by \@gsjaardema in
  Unidata/netcdf-c#2517

* Fix some dependencies in tst_nccopy3 by \@WardF in
  Unidata/netcdf-c#2518

* Update plugins/Makefile.am by \@WardF in
  Unidata/netcdf-c#2519

* Fix prereqs in ncdump/tst_nccopy4 in order to avoid race conditions. by
  \@WardF in Unidata/netcdf-c#2520

* Move construction of VERSION file to end of the build by \@DennisHeimbigner in
  Unidata/netcdf-c#2527

* Add draft filter quickstart guide by \@WardF in
  Unidata/netcdf-c#2531

* Turn off extraneous debug output by \@DennisHeimbigner in
  Unidata/netcdf-c#2537

* typo fix by \@wkliao in Unidata/netcdf-c#2538

* replace 4194304 with READ_BLOCK_SIZE by \@wkliao in
  Unidata/netcdf-c#2539

* Rename variable to avoid function name conflict by \@ibaned in
  Unidata/netcdf-c#2550

* Add Cygwin CI and stop installing unwanted plugins by \@DWesl in
  Unidata/netcdf-c#2529

* Merge subset of v4.9.1 files back into main development branch by \@WardF in
  Unidata/netcdf-c#2530

* Add a Filter quickstart guide document by \@WardF in
  Unidata/netcdf-c#2524

* Fix race condition in ncdump (and other) tests. by \@DennisHeimbigner in
  Unidata/netcdf-c#2552

* Make dap4 reference dap instead of hard-wired to be disabled. by \@WardF in
  Unidata/netcdf-c#2553

* Suppress nczarr_test/tst_unknown filter test by \@DennisHeimbigner in
  Unidata/netcdf-c#2557

* Add fenceposting for HAVE_DECL_ISINF and HAVE_DECL_ISNAN by \@WardF in
  Unidata/netcdf-c#2559

* Add an old static file. by \@WardF in
  Unidata/netcdf-c#2575

* Fix infinite loop in file inferencing by \@DennisHeimbigner in
  Unidata/netcdf-c#2574

* Merge Wellspring back into development branch by \@WardF in
  Unidata/netcdf-c#2560

* Allow ncdump -t to handle variable length string attributes by \@srherbener in
  Unidata/netcdf-c#2584

* Fix an issue I introduced with make distcheck by \@WardF in
  Unidata/netcdf-c#2590

* make UDF0 not require NC_NETCDF4 by \@jedwards4b in
  Unidata/netcdf-c#2586

* Expose user-facing documentation related to byterange DAP functionality.  by
  \@WardF in Unidata/netcdf-c#2596

* Fix Memory Leak by \@DennisHeimbigner in
  Unidata/netcdf-c#2598

* CI: Change autotools CI build to out-of-tree build. by \@DWesl in
  Unidata/netcdf-c#2577

* Update github action configuration scripts. by \@WardF in
  Unidata/netcdf-c#2600

* Update the filter quickstart guide.  by \@WardF in
  Unidata/netcdf-c#2602

* Fix symbol export on Windows by \@WardF in
  Unidata/netcdf-c#2604

## New Contributors
* \@georgthegreat made their first contribution in Unidata/netcdf-c#2412
* \@dzenanz made their first contribution in Unidata/netcdf-c#2470
* \@DWesl made their first contribution in Unidata/netcdf-c#2529
* \@srherbener made their first contribution in Unidata/netcdf-c#2584
* \@jedwards4b made their first contribution in Unidata/netcdf-c#2586

**Full Changelog**: Unidata/netcdf-c@v4.9.0...v4.9.1

### 4.9.1 - Release Candidate 2 - November 21, 2022

#### Known Issues

* A test in the `main` branch of `netcdf-cxx4` is broken by this rc;
  this will bear further investigation, but not being treated as a
  roadblock for the release candidate.

* The new document, `netcdf-c/docs/filter_quickstart.md` is in rough-draft form.

#### Changes

* [Bug Fix] Fix a race condition when testing missing filters. See
  [Github #2557](Unidata/netcdf-c#2557).

* [Bug Fix] Fix some race conditions due to use of a common file in multiple
  shell scripts . See [Github
  #2552](Unidata/netcdf-c#2552).


### 4.9.1 - Release Candidate 1 - October 24, 2022

* [Enhancement][Documentation] Add Plugins Quick Start Guide.  See
  [GitHub #2524](Unidata/netcdf-c#2524) for
  more information.

* [Enhancement] Add new entries in `netcdf_meta.h`, `NC_HAS_BLOSC` and
  `NC_HAS_BZ2`. See [Github
  #2511](Unidata/netcdf-c#2511) and [Github
  #2512](Unidata/netcdf-c#2512) for more
  information.

* [Enhancement] Add new options to `nc-config`: `--has-multifilters`,
  `--has-stdfilters`, `--has-quantize`, `--plugindir`.  See [Github
  #2509](Unidata/netcdf-c#2509) for more
  information.

* [Bug Fix] Fix some errors detected in PR 2497. [PR
  #2497](Unidata/netcdf-c#2497) . See [Github
  #2503](Unidata/netcdf-c#2503).

* [Bug Fix] Split the remote tests into two parts: one for the
  remotetest server and one for all other external servers. Also add a
  configure option to enable the latter set. See [Github
  #2491](Unidata/netcdf-c#2491).

* [Bug Fix] Fix blosc plugin errors. See [Github
  #2461](Unidata/netcdf-c#2461).

* [Bug Fix] Fix support for reading arrays of HDF5 fixed size
  strings. See [Github
  #2466](Unidata/netcdf-c#2466).

* [Bug Fix] Fix some errors detected in [PR
  #2492](Unidata/netcdf-c#2492) . See [Github
  #2497](Unidata/netcdf-c#2497).

* [Enhancement] Add support for Zarr (fixed length) string type in
  nczarr. See [Github
  #2492](Unidata/netcdf-c#2492).

* [Bug Fix] Split the remote tests into two parts: one for the
  remotetest server and one for all other external servers. Also add a
  configure option to enable the latter set. See [Github
  #2491](Unidata/netcdf-c#2491).

* [Bug Fix] Fix support for reading arrays of HDF5 fixed size
  strings. See [Github
  #2462](Unidata/netcdf-c#2466).

* [Bug Fix] Provide a default enum const when fill value does not
  match any enum constant for the value zero. See [Github
  #2462](Unidata/netcdf-c#2462).

* [Bug Fix] Fix the json submodule symbol conflicts between libnetcdf
  and the plugin specific netcdf_json.h. See [Github
  #2448](Unidata/netcdf-c#2448).

* [Bug Fix] Fix quantize with CLASSIC_MODEL files. See [Github
  #2405](Unidata/netcdf-c#2445).

* [Enhancement] Add `--disable-quantize` option to `configure`.

* [Bug Fix] Fix CMakeLists.txt to handle all acceptable boolean values
  for -DPLUGIN_INSTALL_DIR. See [Github
  #2430](Unidata/netcdf-c#2430).

* [Bug Fix] Fix tst_vars3.c to use the proper szip flag. See [Github
  #2421](Unidata/netcdf-c#2421).

* [Enhancement] Provide a simple API to allow user access to the
  internal .rc file table: supports get/set/overwrite of entries of
  the form "key=value". See [Github
  #2408](Unidata/netcdf-c#2408).

* [Bug Fix] Use env variable USERPROFILE instead of HOME for windows
  and mingw. See [Github
  #2405](Unidata/netcdf-c#2405).

* [Bug Fix] Fix the nc_def_var_fletcher32 code in hdf5 to properly
  test value of the fletcher32 argument. See [Github
  #2403](Unidata/netcdf-c#2403).

## 4.9.0 - June 10, 2022

* [Enhancement] Add quantize functions nc_def_var_quantize() and
  nc_inq_var_quantize() to enable lossy compression. See [Github
  #1548](Unidata/netcdf-c#1548).

* [Enhancement] Add zstandard compression functions nc_def_var_zstandard() and
  nc_inq_var_zstandard(). See [Github
  #2173](Unidata/netcdf-c#2173).

* [Enhancement] Have netCDF-4 logging output one file per processor when used
  with parallel I/O. See [Github
  #1762](Unidata/netcdf-c#1762).

* [Enhancement] Improve filter installation process to avoid use of an extra
  shell script. See [Github
  #2348](Unidata/netcdf-c#2348).

* [Bug Fix] Get "make distcheck" to work See [Github
  #2343](Unidata/netcdf-c#2343).

* [Enhancement] Allow the read/write of JSON-valued Zarr attributes to allow for
  domain specific info such as used by GDAL/Zarr. See [Github
  #2278](Unidata/netcdf-c#2278).

* [Enhancement] Turn on the XArray convention for NCZarr files by
  default. WARNING, this means that the mode should explicitly specify "nczarr"
  or "zarr" even if "xarray" or "noxarray" is specified. See [Github
  #2257](Unidata/netcdf-c#2257).

* [Enhancement] Update the documentation to match the current filter
  capabilities See [Github
  #2249](Unidata/netcdf-c#2249).

* [Enhancement] Update the documentation to match the current filter
  capabilities. See [Github
  #2249](Unidata/netcdf-c#2249).

* [Enhancement] Support installation of pre-built standard filters into
  user-specified location. See [Github
  #2318](Unidata/netcdf-c#2318).

* [Enhancement] Improve filter support. More specifically (1) add
  nc_inq_filter_avail to check if a filter is available, (2) add the notion of
  standard filters, (3) cleanup szip support to fix interaction with NCZarr. See
  [Github #2245](Unidata/netcdf-c#2245).

* [Enhancement] Switch to tinyxml2 as the default xml parser implementation. See
  [Github #2170](Unidata/netcdf-c#2170).

* [Bug Fix] Require that the type of the variable in nc_def_var_filter is not
  variable length. See [Github
  #/2231](Unidata/netcdf-c#2231).

* [File Change] Apply HDF5 v1.8 format compatibility when writing to previous
  files, as well as when creating new files.  The superblock version remains at
  2 for newly created files.  Full backward read/write compatibility for
  netCDF-4 is maintained in all cases.  See [Github
  #2176](Unidata/netcdf-c#2176).

* [Enhancement] Add ability to set dataset alignment for netcdf-4/HDF5
  files. See [Github #2206](Unidata/netcdf-c#2206).

* [Bug Fix] Improve UTF8 support on windows so that it can use utf8
  natively. See [Github #2222](Unidata/netcdf-c#2222).

* [Enhancement] Add complete bitgroom support to NCZarr. See [Github
  #2197](Unidata/netcdf-c#2197).

* [Bug Fix] Clean up the handling of deeply nested VLEN types. Marks
  nc_free_vlen() and nc_free_string as deprecated in favor of
  ncaux_reclaim_data(). See [Github
  #2179](Unidata/netcdf-c#2179).

* [Bug Fix] Make sure that netcdf.h accurately defines the flags in the
  open/create mode flags. See [Github
  #2183](Unidata/netcdf-c#2183).

* [Enhancement] Improve support for msys2+mingw platform. See [Github
  #2171](Unidata/netcdf-c#2171).

* [Bug Fix] Clean up the various inter-test dependencies in ncdump for
  CMake. See [Github #2168](Unidata/netcdf-c#2168).

* [Bug Fix] Fix use of non-aws appliances. See [Github
  #2152](Unidata/netcdf-c#2152).

* [Enhancement] Added options to suppress the new behavior from [Github
  #2135](Unidata/netcdf-c#2135).  The options for
  `cmake` and `configure` are, respectively `-DENABLE_LIBXML2` and
  `--(enable/disable)-libxml2`. Both of these options defaul to 'on/enabled'.
  When disabled, the bundled `ezxml` XML interpreter is used regardless of
  whether `libxml2` is present on the system.

* [Enhancement] Support optional use of libxml2, otherwise default to ezxml. See
  [Github #2135](Unidata/netcdf-c#2135) -- H/T to
  [Egbert Eich](https://github.com/e4t).

* [Bug Fix] Fix several os related errors. See [Github
  #2138](Unidata/netcdf-c#2138).

* [Enhancement] Support byte-range reading of netcdf-3 files stored in private
  buckets in S3. See [Github
  #2134](Unidata/netcdf-c#2134)

* [Enhancement] Support Amazon S3 access for NCZarr. Also support use of the
  existing Amazon SDK credentials system. See [Github
  #2114](Unidata/netcdf-c#2114)

* [Bug Fix] Fix string allocation error in H5FDhttp.c. See [Github
  #2127](Unidata/netcdf-c#2127).

* [Bug Fix] Apply patches for ezxml and for selected oss-fuzz detected
  errors. See [Github #2125](Unidata/netcdf-c#2125).

* [Bug Fix] Ensure that internal Fortran APIs are always defined. See [Github
  #2098](Unidata/netcdf-c#2098).

* [Enhancement] Support filters for NCZarr. See [Github
  #2101](Unidata/netcdf-c#2101)

* [Bug Fix] Make PR 2075 long file name be idempotent. See [Github
  #2094](Unidata/netcdf-c#2094).


## 4.8.1 - August 18, 2021

* [Bug Fix] Fix multiple bugs in libnczarr. See [Github
  #2066](Unidata/netcdf-c#2066).

* [Enhancement] Support windows network paths (e.g. \\svc\...). See [Github
  #2065](Unidata/netcdf-c#2065).

* [Enhancement] Convert to a new representation of the NCZarr meta-data
  extensions: version 2. Read-only backward compatibility is provided. See
  [Github #2032](Unidata/netcdf-c#2032).

* [Bug Fix] Fix dimension_separator bug in libnczarr. See [Github
  #2035](Unidata/netcdf-c#2035).

* [Bug Fix] Fix bugs in libdap4. See [Github
  #2005](Unidata/netcdf-c#2005).

* [Bug Fix] Store NCZarr fillvalue as a singleton instead of a 1-element
  array. See [Github #2017](Unidata/netcdf-c#2017).

* [Bug Fixes] The netcdf-c library was incorrectly determining the scope of
  dimension; similar to the type scope problem. See [Github
  #2012](Unidata/netcdf-c#2012) for more information.

* [Bug Fix] Re-enable DAP2 authorization testing. See [Github
  #2011](Unidata/netcdf-c#2011).

* [Bug Fix] Fix bug with windows version of mkstemp that causes failure to
  create more than 26 temp files. See [Github
  #1998](Unidata/netcdf-c#1998).

* [Bug Fix] Fix ncdump bug when printing VLENs with basetype char. See [Github
  #1986](Unidata/netcdf-c#1986).

* [Bug Fixes] The netcdf-c library was incorrectly determining the scope of
  types referred to by nc_inq_type_equal. See [Github
  #1959](Unidata/netcdf-c#1959) for more information.

* [Bug Fix] Fix bug in use of XGetopt when building under Mingw. See [Github
  #2009](Unidata/netcdf-c#2009).

* [Enhancement] Improve the error reporting when attempting to use a filter for
  which no implementation can be found in HDF5_PLUGIN_PATH. See [Github
  #2000](Unidata/netcdf-c#2000) for more information.

* [Bug Fix] Fix `make distcheck` issue in `nczarr_test/` directory. See [Github
  #2007](Unidata/netcdf-c#2007).

* [Bug Fix] Fix bug in NCclosedir in dpathmgr.c. See [Github
  #2003](Unidata/netcdf-c#2003).

* [Bug Fix] Fix bug in ncdump that assumes that there is a relationship between
  the total number of dimensions and the max dimension id. See [Github
  #2004](Unidata/netcdf-c#2004).

* [Bug Fix] Fix bug in JSON processing of strings with embedded quotes. See
  [Github #1993](Unidata/netcdf-c#1993).

* [Enhancement] Add support for the new "dimension_separator" enhancement to
  Zarr v2. See [Github #1990](Unidata/netcdf-c#1990) for
  more information.

* [Bug Fix] Fix hack for handling failure of shell programs to properly handle
  escape characters. See [Github
  #1989](Unidata/netcdf-c#1989).

* [Bug Fix] Allow some primitive type names to be used as identifiers depending
  on the file format. See [Github
  #1984](Unidata/netcdf-c#1984).

* [Enhancement] Add support for reading/writing pure Zarr storage format that
  supports the XArray _ARRAY_DIMENSIONS attribute. See [Github
  #1952](Unidata/netcdf-c#1952) for more information.

* [Update] Updated version of bzip2 used in filter testing/functionality, in
  support of [Github #1969](Unidata/netcdf-c#1969).

* [Bug Fix] Corrected HDF5 version detection logic as described in [Github
  #1962](Unidata/netcdf-c#1962).

## 4.8.0 - March 30, 2021

* [Enhancement] Bump the NC_DISPATCH_VERSION from 2 to 3, and as a side effect,
  unify the definition of NC_DISPATCH_VERSION so it only needs to be defined in
  CMakeLists.txt and configure.ac. See [Github
  #1945](Unidata/netcdf-c#1945) for more information.

* [Enhancement] Provide better cross platform path name management. This
  converts paths for various platforms (e.g. Windows, MSYS, etc.) so that they
  are in the proper format for the executing platform. See [Github
  #1958](Unidata/netcdf-c#1958) for more information.

* [Bug Fixes] The nccopy program was treating -d0 as turning deflation on rather
  than interpreting it as "turn off deflation". See [Github
  #1944](Unidata/netcdf-c#1944) for more information.

* [Enhancement] Add support for storing NCZarr data in zip files. See [Github
  #1942](Unidata/netcdf-c#1942) for more information.

* [Bug Fixes] Make fillmismatch the default for DAP2 and DAP4; too many servers
  ignore this requirement.

* [Bug Fixes] Fix some memory leaks in NCZarr, fix a bug with long strides in
  NCZarr. See [Github #1913](Unidata/netcdf-c#1913) for
  more information.

* [Enhancement] Add some optimizations to NCZarr, dosome cleanup of code cruft,
  add some NCZarr test cases, add a performance test to NCZarr. See [Github
  #1908](Unidata/netcdf-c#1908) for more information.

* [Bug Fix] Implement a better chunk cache system for NCZarr. The cache now uses
  extendible hashing plus a linked list for provide a combination of
  expandibility, fast access, and LRU behavior. See [Github
  #1887](Unidata/netcdf-c#1887) for more information.

* [Enhancement] Provide .rc fields for S3 authentication: HTTP.S3.ACCESSID and
  HTTP.S3.SECRETKEY.

* [Enhancement] Give the client control over what parts of a DAP2 URL are URL
  encoded (i.e. %xx). This is to support the different decoding rules that
  servers apply to incoming URLS. See [Github
  #1884](Unidata/netcdf-c#1884) for more information.

* [Bug Fix] Fix incorrect time offsets from `ncdump -t`, in some cases when the
  time `units` attribute contains both a **non-zero** time-of-day, and a time
  zone suffix containing the letter "T", such as "UTC".  See [Github
  #1866](Unidata/netcdf-c#1866) for more information.

* [Bug Fix] Cleanup the NCZarr S3 build options. See [Github
  #1869](Unidata/netcdf-c#1869) for more information.

* [Bug Fix] Support aligned access for selected ARM processors.  See [Github
  #1871](Unidata/netcdf-c#1871) for more information.

* [Documentation] Migrated the documents in the NUG/ directory to the dedicated
  NUG repository found at https://github.com/Unidata/netcdf

* [Bug Fix] Revert the internal filter code to simplify it. From the user's
  point of view, the only visible change should be that (1) the functions that
  convert text to filter specs have had their signature reverted and renamed and
  have been moved to netcdf_aux.h, and (2) Some filter API functions now return
  NC_ENOFILTER when inquiry is made about some filter. Internally, the dispatch
  table has been modified to get rid of the complex structures.

* [Bug Fix] If the HDF5 byte-range Virtual File Driver is available )HDf5 1.10.6
  or later) then use it because it has better performance than the one currently
  built into the netcdf library.

* [Bug Fix] Fixed byte-range support with cURL > 7.69. See
  [Unidata/netcdf-c#1798].

* [Enhancement] Added new test for using compression with parallel I/O:
  nc_test4/tst_h_par_compress.c. See
  [Unidata/netcdf-c#1784].

* [Bug Fix] Don't return error for extra calls to nc_redef() for netCDF/HDF5
  files, unless classic model is in use. See
  [Unidata/netcdf-c#1779].

* [Enhancement] Added new parallel I/O benchmark program to mimic NOAA UFS data
  writes, built when --enable-benchmarks is in configure. See
  [Unidata/netcdf-c#1777].

* [Bug Fix] Now allow szip to be used on variables with unlimited dimension
  [Unidata/netcdf-c#1774].

* [Enhancement] Add support for cloud storage using a variant of the Zarr
  storage format. Warning: this feature is highly experimental and is subject to
  rapid evolution
  [https://www.unidata.ucar.edu/blogs/developer/en/entry/overview-of-zarr-support-in].

* [Bug Fix] Fix nccopy to properly set default chunking parameters when not
  otherwise specified. This can significantly improve performance in selected
  cases. Note that if seeing slow performance with nccopy, then, as a
  work-around, specifically set the chunking
  parameters. [Unidata/netcdf-c#1763].

* [Bug Fix] Fix some protocol bugs/differences between the netcdf-c library and
  the OPeNDAP Hyrax server. Also cleanup checksum handling
  [https://github.com/Unidata/netcdf-c/issues/1712].* [Bug Fix] IMPORTANT: Ncgen
  was not properly handling large data sections. The problem manifests as
  incorrect ordering of data in the created file. Aside from examining the file
  with ncdump, the error can be detected by running ncgen with the -lc flag (to
  produce a C file). Examine the file to see if any variable is written in pieces
  as opposed to a single call to nc_put_vara. If multiple calls to nc_put_vara are
  used to write a variable, then it is probable that the data order is
  incorrect. Such multiple writes can occur for large variables and especially
  when one of the dimensions is unlimited.

* [Bug Fix] Add necessary __declspec declarations to allow compilation of netcdf
  library without causing errors or (_declspec related) warnings
  [Unidata/netcdf-c#1725].

* [Enhancement] When a filter is applied twice with different
parameters, then the second set is used for writing the dataset
[Unidata/netcdf-c#1713].

* [Bug Fix] Now larger cache settings are used for sequential HDF5 file creates/opens on parallel I/O capable builds; see [Github #1716](Unidata/netcdf-c#1716) for more information.

* [Bug Fix] Add functions to libdispatch/dnotnc4.c to support
   dispatch table operations that should work for any dispatch
   table, even if they do not do anything; functions such as
   nc_inq_var_filter [Unidata/netcdf-c#1693].

* [Bug Fix] Fixed a scalar annotation error when scalar == 0; see [Github
  #1707](Unidata/netcdf-c#1707) for more information.

* [Bug Fix] Use proper CURLOPT values for VERIFYHOST and VERIFYPEER; the
  semantics for VERIFYHOST in particular changed. Documented in NUG/DAP2.md. See
  [Unidata/netcdf-c#1684].

* [Bug Fix][cmake] Correct an issue with parallel filter test logic in
  CMake-based builds.

* [Bug Fix] Now allow nc_inq_var_deflate()/nc_inq_var_szip() to be called for
  all formats, not just HDF5. Non-HDF5 files return NC_NOERR and report no
  compression in use. This reverts behavior that was changed in the 4.7.4
  release. See [Unidata/netcdf-c#1691].

* [Bug Fix] Compiling on a big-endian machine exposes some missing forward
  delcarations in dfilter.c.

* [File Change] Change from HDF5 v1.6 format compatibility, back to v1.8
  compatibility, for newly created files.  The superblock changes from version 0
  back to version 2.  An exception is when using libhdf5 deprecated versions
  1.10.0 and 1.10.1, which can only create v1.6 compatible format.  Full
  backward read/write compatibility for netCDF-4 is maintained in all cases.
  See [Github #951](Unidata/netcdf-c#951).

## 4.7.4 - March 27, 2020

* [Windows] Bumped packaged HDF5 to 1.10.6, HDF4 to 4.2.14, and libcurl to
  7.60.0.

* [Enhancement] Support has been added for HDF5-1.12.0.  See
  [Unidata/netcdf-c#1528].

* [Bug Fix] Correct behavior for the command line utilities when directly
  accessing a directory using utf8 characters. See
  [Github #1669] (Unidata/netcdf-c#1669),
  [Github #1668] (Unidata/netcdf-c#1668) and
  [Github #1666] (Unidata/netcdf-c#1666) for more information.

* [Bug Fix] Attempts to set filters or chunked storage on scalar vars will now
  return NC_EINVAL. Scalar vars cannot be chunked, and only chunked vars can
  have filters. Previously the library ignored these attempts, and always
  storing scalars as contiguous storage. See
  [Unidata/netcdf-c#1644].

* [Enhancement] Support has been added for multiple filters per variable.  See
  [Unidata/netcdf-c#1584].

* [Enhancement] Now nc_inq_var_szip retuns 0 for parameter values if szip is not
  in use for var. See [Unidata/netcdf-c#1618].

* [Enhancement] Now allow parallel I/O with filters, for HDF5-1.10.3 and
  later. See [Unidata/netcdf-c#1473].

* [Enhancement] Increased default size of cache buffer to 16 MB, from 4
  MB. Increased number of slots to 4133. See
  [Unidata/netcdf-c#1541].

* [Enhancement] Allow zlib compression to be used with parallel I/O writes, if
  HDF5 version is 1.10.3 or greater. See
  [Unidata/netcdf-c#1580].

* [Enhancement] Restore use of szip compression when writing data (including
  writing in parallel if HDF5 version is 1.10.3 or greater). See
  [Unidata/netcdf-c#1546].

* [Enhancement] Enable use of compact storage option for small vars in
  netCDF/HDF5 files. See [Unidata/netcdf-c#1570].

* [Enhancement] Updated benchmarking program bm_file.c to better handle very
  large files. See [Unidata/netcdf-c#1555].

* [Enhancement] Added version number to dispatch table, and now check version
  with nc_def_user_format(). See
  [Unidata/netcdf-c#1599].

* [Bug Fix] Fixed user setting of MPI launcher for parallel I/O HDF5 test in
  h5_test. See [Unidata/netcdf-c#1626].

* [Bug Fix] Fixed problem of growing memory when netCDF-4 files were opened and
  closed. See [Unidata/netcdf-c#1575 and
  Unidata/netcdf-c#1571].

* [Enhancement] Increased size of maximum allowed name in HDF4 files to
  NC_MAX_NAME. See [Unidata/netcdf-c#1631].

## 4.7.3 - November 20, 2019

* [Bug Fix]Fixed an issue where installs from tarballs will not properly compile
  in parallel environments.

* [Bug Fix] Library was modified so that rewriting the same attribute happens
  without deleting the attribute, to avoid a limit on how many times this may be
  done in HDF5. This fix was thought to be in 4.6.2 but was not. See
  [Unidata/netcdf-c#350].

* [Enhancement] Add a dispatch version number to netcdf_meta.h and
  libnetcdf.settings, in case we decide to change dispatch table in future. See
  [Unidata/netcdf-c#1469].

* [Bug Fix] Now testing that endianness can only be set on atomic ints and
  floats. See [Unidata/netcdf-c#1479].

* [Bug Fix] Fix for subtle error involving var and unlimited dim of the same
  name, but unrelated, in netCDF-4. See
  [Unidata/netcdf-c#1496].

* [Enhancement] Update for attribute documentation. See
  [Unidata/netcdf-c#1512].

* [Bug Fix][Enhancement] Corrected assignment of anonymous (a.k.a. phony)
  dimensions in an HDF5 file. Now when a dataset uses multiple dimensions of the
  same size, netcdf assumes they are different dimensions. See [GitHub
  #1484](Unidata/netcdf-c#1484) for more information.

## 4.7.2 - October 22, 2019

* [Bug Fix][Enhancement] Various bug fixes and enhancements.

* [Bug Fix][Enhancement] Corrected an issue where protected memory was being
  written to with some pointer slight-of-hand.  This has been in the code for a
  while, but appears to be caught by the compiler on OSX, under circumstances
  yet to be completely nailed down.  See
  [GitHub #1486] (Unidata/netcdf-c#1486) for more information.

* [Enhancement] [Parallel IO] Added support for parallel functions in MSVC. See
  [Github #1492](Unidata/netcdf-c#1492) for more
  information.

* [Enhancement] Added a function for changing the ncid of an open file.  This
  function should only be used if you know what you are doing, and is meant to
  be used primarily with PIO integration. See
  [GitHub #1483] (Unidata/netcdf-c#1483) and
  [GitHub #1487] (Unidata/netcdf-c#1487) for more information.

## 4.7.1 - August 27, 2019

* [Enhancement] Added unit_test directory, which contains unit tests for the
  libdispatch and libsrc4 code (and any other directories that want to put unit
  tests there). Use --disable-unit-tests to run without unit tests (ex. for code
  coverage analysis). See
  [GitHub #1458] (Unidata/netcdf-c#1458).

* [Bug Fix] Remove obsolete _CRAYMPP and LOCKNUMREC macros from code. Also
  brought documentation up to date in man page. These macros were used in
  ancient times, before modern parallel I/O systems were developed. Programmers
  interested in parallel I/O should see nc_open_par() and nc_create_par(). See
  [GitHub #1459](Unidata/netcdf-c#1459).

* [Enhancement] Remove obsolete and deprecated functions nc_set_base_pe() and
  nc_inq_base_pe() from the dispatch table. (Both functions are still supported
  in the library, this is an internal change only.) See [GitHub
  #1468](Unidata/netcdf-c#1468).

* [Bug Fix] Reverted nccopy behavior so that if no -c parameters are given, then
  any default chunking is left to the netcdf-c library to decide. See [GitHub
  #1436](Unidata/netcdf-c#1436).

## 4.7.0 - April 29, 2019

* [Enhancement] Updated behavior of `pkgconfig` and `nc-config` to allow the use
  of the `--static` flags, e.g. `nc-config --libs --static`, which will show
  information for linking against `libnetcdf` statically. See
  [Github #1360] (Unidata/netcdf-c#1360) and
  [Github #1257] (Unidata/netcdf-c#1257) for more information.

* [Enhancement] Provide byte-range reading of remote datasets. This allows
  read-only access to, for example, Amazon S3 objects and also Thredds Server
  datasets via the HTTPService access method.  See
  [GitHub #1251] (Unidata/netcdf-c#1251).

* Update the license from the home-brewed NetCDF license to the standard
  3-Clause BSD License.  This change does not result in any new restrictions; it
  is merely the adoption of a standard, well-known and well-understood license
  in place of the historic NetCDF license written at Unidata.  This is part of a
  broader push by Unidata to adopt modern, standardized licensing.

## 4.6.3 - February 28, 2019

* [Bug Fix] Correctly generated `netcdf.pc` generated either by `configure` or
  `cmake`.  If linking against a static netcdf, you would need to pass the
  `--static` argument to `pkg-config` in order to list all of the downstream
  dependencies.  See
  [Github #1324](Unidata/netcdf-c#1324) for more information.

* Now always write hidden coordinates attribute, which allows faster file opens
  when present. See
  [Github #1262](Unidata/netcdf-c#1262) for more information.

* Some fixes for rename, including fix for renumbering of varids after a rename
  (#1307), renaming var to dim without coordinate var. See
  [Github #1297] (Unidata/netcdf-c#1297).

* Fix of NULL parameter causing segfaults in put_vars functions. See
   [Github #1265] (Unidata/netcdf-c#1265) for more information.

* Fix of --enable-benchmark benchmark tests
   [Github #1211] (Unidata/netcdf-c#1211)

* Update the license from the home-brewed NetCDF license to the standard
  3-Clause BSD License.  This change does not result in any new restrictions; it
  is merely the adoption of a standard, well-known and well-understood license
  in place of the historic NetCDF license written at Unidata.  This is part of a
  broader push by Unidata to adopt modern, standardized licensing.

* [BugFix] Corrected DAP-related issues on big-endian machines. See
  [Github #1321] (Unidata/netcdf-c#1321),
  [Github #1302] (Unidata/netcdf-c#1302) for more information.

* [BugFix][Enhancement] Various and sundry bugfixes and performance
  enhancements, thanks to \@edhartnett, \@gsjarrdema, \@t-b, \@wkliao, and all
  of our other contributors.

* [Enhancement] Extended `nccopy -F` syntax to support multiple variables with a
  single invocation. See
  [Github #1311](Unidata/netcdf-c#1311) for more information.

* [BugFix] Corrected an issue where DAP2 was incorrectly converting signed
  bytes, resulting in an erroneous error message under some circumstances. See
  [GitHub #1317] (Unidata/netcdf-c#1317) for more
  information.  See
  [Github #1319] (Unidata/netcdf-c#1319) for related information.

* [BugFix][Enhancement] Modified `nccopy` so that `_NCProperties` is not copied
  over verbatim but is instead generated based on the version of `libnetcdf`
  used when copying the file.  Additionally, `_NCProperties` are displayed
  if/when associated with a netcdf3 file, now. See
  [GitHub#803] (Unidata/netcdf-c#803) for more information.
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