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re: https://github.com/Unidata/netcdf-c/issues/1584 Support has been added for multiple filters per variable. This affects a number of components in netcdf. The new APIs are documented in NUG/filters.md. The primary changes are: * A set of new functions are provided (see __include/netcdf_filter.h__). - Obtain a list of the filters associated with a variable - Obtain the parameters for a specific filter. * The existing __nc_inq_var_filter__ function now returns info about the first defined filter. * The utilities (ncgen, ncdump, and nccopy) now support an extended format for specifying a sequence of filters. The general form is __<filter>|<filter>..._. * The ncdump **_Filter** attribute now dumps a list of all the filters associated with a variable using the above new format. * Filter specifications can now use a filter name instead of number for filters known to the netcdf library, which in turn is taken from the HDF5 filter registration page. * New errors are defined: NC_EFILTER and NC_ENOFILTER. The latter is returned if an attempt is made to access an unknown filter. * Internally, the dispatch table has been extended to add a function to handle all of the filter functions. * New, filter-related, tests were added to nc_test4. * A new plugin was added to the plugins directory to help with testing. Notes: 1. The shuffle and fletcher32 filters are not part of the multifilter system. Misc. changes: 1. A debug module was added to libhdf5 to help catch error locations.
22 lines
366 B
Plaintext
22 lines
366 B
Plaintext
netcdf multifiltered {
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dimensions:
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dim0 = 4 ;
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dim1 = 4 ;
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dim2 = 4 ;
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dim3 = 4 ;
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// global attributes:
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:_Format = "netCDF-4" ;
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group: g {
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variables:
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float var(dim0, dim1, dim2, dim3) ;
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var:_Storage = "chunked" ;
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var:_ChunkSizes = 4, 4, 4, 4 ;
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var:_Filter = "307,4|4,32,32" ;
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var:_NoFill = "true" ;
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// group attributes:
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} // group g
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}
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