netcdf-c/nczarr_test/ref_purezarr.cdl

netcdf tmp_purezarr {
dimensions:
	_zdim_2 = 2 ;
	_zdim_5 = 5 ;
variables:
	int i(_zdim_2, _zdim_5) ;
data:

 i =
  _, _, _, _, _,
  _, _, _, _, _ ;
}
Add support for the XArray Zarr _ARRAY_DIMENSIONS attribute The XArray implementation that uses Zarr for storage provides a mechanism to simulate named dimensions. It does this by adding a per-variable attribute called _ARRAY_DIMENSIONS. This attribute contains a list of names to be matched against the shape values of the variable. In effect a named dimension is created with the name _ARRAY_DIMENSIONS(i) and length shape(i) for all i in range 0..rank(variable). Both read and write support is provided. This XArray support is only invoked if the mode value of "xarray" is defined. So for example, as in this URL. ```` https://s3.us-west-1.amazonaws.com/bucket/dataset#mode=nczarr,xarray,s3 ```` Note that the "xarray" mode flag also implies mode flag "zarr", so the above is equivalent to this URL. ```` https://s3.us-west-1.amazonaws.com/bucket/dataset#mode=nczarr,zarr,xarray,s3 ```` The primary change to implement this was to unify the handling of dimension references in libnczarr/zsync. A test for this and other pure-zarr features was added as nczarr_test/run_purezarr.sh Other changes: * Make sure distcheck leaves no files around. * Change the special attribute flag DIMSCALEFLAG to HIDDENATTRFLAG to support the xarray attribute. * Annotate the zmap implementations with feature flags such as WRITEONCE (for zip files). 2021-02-25 04:46:11 +08:00			`netcdf tmp_purezarr {`
			`dimensions:`
Add filter support to NCZarr Filter support has three goals: 1. Use the existing HDF5 filter implementations, 2. Allow filter metadata to be stored in the NumCodecs metadata format used by Zarr, 3. Allow filters to be used even when HDF5 is disabled Detailed usage directions are define in docs/filters.md. For now, the existing filter API is left in place. So filters are defined using ''nc_def_var_filter'' using the HDF5 style where the id and parameters are unsigned integers. This is a big change since filters affect many parts of the code. In the following, the terms "compressor" and "filter" and "codec" are generally used synonomously. ### Filter-Related Changes: * In order to support dynamic loading of shared filter libraries, a new library was added in the libncpoco directory; it helps to isolate dynamic loading across multiple platforms. * Provide a json parsing library for use by plugins; this is created by merging libdispatch/ncjson.c with include/ncjson.h. * Add a new _Codecs attribute to allow clients to see what codecs are being used; let ncdump -s print it out. * Provide special headers to help support compilation of HDF5 filters when HDF5 is not enabled: netcdf_filter_hdf5_build.h and netcdf_filter_build.h. * Add a number of new test to test the new nczarr filters. * Let ncgen parse _Codecs attribute, although it is ignored. ### Plugin directory changes: * Add support for the Blosc compressor; this is essential because it is the most common compressor used in Zarr datasets. This also necessitated adding a CMake FindBlosc.cmake file * Add NCZarr support for the big-four filters provided by HDF5: shuffle, fletcher32, deflate (zlib), and szip * Add a Codec defaulter (see docs/filters.md) for the big four filters. * Make plugins work with windows by properly adding __declspec declaration. ### Misc. Non-Filter Changes * Replace most uses of USE_NETCDF4 (deprecated) with USE_HDF5. * Improve support for caching * More fixes for path conversion code * Fix misc. memory leaks * Add new utility -- ncdump/ncpathcvt -- that does more or less the same thing as cygpath. * Add a number of new test to test the non-filter fixes. * Update the parsers * Convert most instances of '#ifdef _MSC_VER' to '#ifdef _WIN32' 2021-09-03 07:04:26 +08:00			`_zdim_2 = 2 ;`
			`_zdim_5 = 5 ;`
Add support for the XArray Zarr _ARRAY_DIMENSIONS attribute The XArray implementation that uses Zarr for storage provides a mechanism to simulate named dimensions. It does this by adding a per-variable attribute called _ARRAY_DIMENSIONS. This attribute contains a list of names to be matched against the shape values of the variable. In effect a named dimension is created with the name _ARRAY_DIMENSIONS(i) and length shape(i) for all i in range 0..rank(variable). Both read and write support is provided. This XArray support is only invoked if the mode value of "xarray" is defined. So for example, as in this URL. ```` https://s3.us-west-1.amazonaws.com/bucket/dataset#mode=nczarr,xarray,s3 ```` Note that the "xarray" mode flag also implies mode flag "zarr", so the above is equivalent to this URL. ```` https://s3.us-west-1.amazonaws.com/bucket/dataset#mode=nczarr,zarr,xarray,s3 ```` The primary change to implement this was to unify the handling of dimension references in libnczarr/zsync. A test for this and other pure-zarr features was added as nczarr_test/run_purezarr.sh Other changes: * Make sure distcheck leaves no files around. * Change the special attribute flag DIMSCALEFLAG to HIDDENATTRFLAG to support the xarray attribute. * Annotate the zmap implementations with feature flags such as WRITEONCE (for zip files). 2021-02-25 04:46:11 +08:00			`variables:`
Add filter support to NCZarr Filter support has three goals: 1. Use the existing HDF5 filter implementations, 2. Allow filter metadata to be stored in the NumCodecs metadata format used by Zarr, 3. Allow filters to be used even when HDF5 is disabled Detailed usage directions are define in docs/filters.md. For now, the existing filter API is left in place. So filters are defined using ''nc_def_var_filter'' using the HDF5 style where the id and parameters are unsigned integers. This is a big change since filters affect many parts of the code. In the following, the terms "compressor" and "filter" and "codec" are generally used synonomously. ### Filter-Related Changes: * In order to support dynamic loading of shared filter libraries, a new library was added in the libncpoco directory; it helps to isolate dynamic loading across multiple platforms. * Provide a json parsing library for use by plugins; this is created by merging libdispatch/ncjson.c with include/ncjson.h. * Add a new _Codecs attribute to allow clients to see what codecs are being used; let ncdump -s print it out. * Provide special headers to help support compilation of HDF5 filters when HDF5 is not enabled: netcdf_filter_hdf5_build.h and netcdf_filter_build.h. * Add a number of new test to test the new nczarr filters. * Let ncgen parse _Codecs attribute, although it is ignored. ### Plugin directory changes: * Add support for the Blosc compressor; this is essential because it is the most common compressor used in Zarr datasets. This also necessitated adding a CMake FindBlosc.cmake file * Add NCZarr support for the big-four filters provided by HDF5: shuffle, fletcher32, deflate (zlib), and szip * Add a Codec defaulter (see docs/filters.md) for the big four filters. * Make plugins work with windows by properly adding __declspec declaration. ### Misc. Non-Filter Changes * Replace most uses of USE_NETCDF4 (deprecated) with USE_HDF5. * Improve support for caching * More fixes for path conversion code * Fix misc. memory leaks * Add new utility -- ncdump/ncpathcvt -- that does more or less the same thing as cygpath. * Add a number of new test to test the non-filter fixes. * Update the parsers * Convert most instances of '#ifdef _MSC_VER' to '#ifdef _WIN32' 2021-09-03 07:04:26 +08:00			`int i(_zdim_2, _zdim_5) ;`
Add support for the XArray Zarr _ARRAY_DIMENSIONS attribute The XArray implementation that uses Zarr for storage provides a mechanism to simulate named dimensions. It does this by adding a per-variable attribute called _ARRAY_DIMENSIONS. This attribute contains a list of names to be matched against the shape values of the variable. In effect a named dimension is created with the name _ARRAY_DIMENSIONS(i) and length shape(i) for all i in range 0..rank(variable). Both read and write support is provided. This XArray support is only invoked if the mode value of "xarray" is defined. So for example, as in this URL. ```` https://s3.us-west-1.amazonaws.com/bucket/dataset#mode=nczarr,xarray,s3 ```` Note that the "xarray" mode flag also implies mode flag "zarr", so the above is equivalent to this URL. ```` https://s3.us-west-1.amazonaws.com/bucket/dataset#mode=nczarr,zarr,xarray,s3 ```` The primary change to implement this was to unify the handling of dimension references in libnczarr/zsync. A test for this and other pure-zarr features was added as nczarr_test/run_purezarr.sh Other changes: * Make sure distcheck leaves no files around. * Change the special attribute flag DIMSCALEFLAG to HIDDENATTRFLAG to support the xarray attribute. * Annotate the zmap implementations with feature flags such as WRITEONCE (for zip files). 2021-02-25 04:46:11 +08:00			`data:`

			`i =`
			`_, _, _, _, _,`
			`_, _, _, _, _ ;`
			`}`