2010-06-03 21:24:43 +08:00
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netcdf tst_special_atts {
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types:
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compound obs_t {
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byte day ;
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short elev ;
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int count ;
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float relhum ;
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double time ;
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ubyte category ;
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ushort id ;
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uint particularity ;
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int64 attention_span ;
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}; // obs_t
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dimensions:
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dim1 = 10 ;
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dim2 = 20 ;
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dim3 = 30 ;
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variables:
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int var1(dim1) ;
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var1:_Storage = "contiguous" ;
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var1:_Endianness = "little" ;
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int var2(dim1, dim2) ;
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var2:_Storage = "chunked" ;
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var2:_ChunkSizes = 6, 7 ;
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var2:_Fletcher32 = "true" ;
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var2:_Endianness = "big" ;
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int var3(dim1, dim2, dim3) ;
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var3:_Storage = "chunked" ;
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var3:_ChunkSizes = 6, 7, 8 ;
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var3:_DeflateLevel = 2 ;
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var3:_Endianness = "little" ;
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int var4(dim1, dim2, dim3) ;
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var4:_Storage = "chunked" ;
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var4:_ChunkSizes = 6, 7, 8 ;
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var4:_Shuffle = "true" ;
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Enhance/Fix filter support
re: Discussion https://github.com/Unidata/netcdf-c/discussions/2214
The primary change is to support so-called "standard filters".
A standard filter is one that is defined by the following
netcdf-c API:
````
int nc_def_var_XXX(int ncid, int varid, size_t nparams, unsigned* params);
int nc_inq_var_XXXX(int ncid, int varid, int* usefilterp, unsigned* params);
````
So for example, zstandard would be a standard filter by defining
the functions *nc_def_var_zstandard* and *nc_inq_var_zstandard*.
In order to define these functions, we need a new dispatch function:
````
int nc_inq_filter_avail(int ncid, unsigned filterid);
````
This function, combined with the existing filter API can be used
to implement arbitrary standard filters using a simple code pattern.
Note that I would have preferred that this function return a list
of all available filters, but HDF5 does not support that functionality.
So this PR implements the dispatch function and implements
the following standard functions:
+ bzip2
+ zstandard
+ blosc
Specific test cases are also provided for HDF5 and NCZarr.
Over time, other specific standard filters will be defined.
## Primary Changes
* Add nc_inq_filter_avail() to netcdf-c API.
* Add standard filter implementations to test use of *nc_inq_filter_avail*.
* Bump the dispatch table version number and add to all the relevant
dispatch tables (libsrc, libsrcp, etc).
* Create a program to invoke nc_inq_filter_avail so that it is accessible
to shell scripts.
* Cleanup szip support to properly support szip
when HDF5 is disabled. This involves detecting
libsz separately from testing if HDF5 supports szip.
* Integrate shuffle and fletcher32 into the existing
filter API. This means that, for example, nc_def_var_fletcher32
is now a wrapper around nc_def_var_filter.
* Extend the Codec defaulting to allow multiple default shared libraries.
## Misc. Changes
* Modify configure.ac/CMakeLists.txt to look for the relevant
libraries implementing standard filters.
* Modify libnetcdf.settings to list available standard filters
(including deflate and szip).
* Add CMake test modules to locate libbz2 and libzstd.
* Cleanup the HDF5 memory manager function use in the plugins.
* remove unused file include//ncfilter.h
* remove tests for the HDF5 memory operations e.g. H5allocate_memory.
* Add flag to ncdump to force use of _Filter instead of _Deflate
or _Shuffle or _Fletcher32. Used for testing.
2022-03-15 02:39:37 +08:00
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var4:_DeflateLevel = 2 ;
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2010-06-03 21:24:43 +08:00
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var4:_Endianness = "little" ;
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var4:_NoFill = "true" ;
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obs_t var5(dim1) ;
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var5:_Storage = "chunked" ;
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var5:_ChunkSizes = 6 ;
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var5:_Fletcher32 = "true" ;
|
Enhance/Fix filter support
re: Discussion https://github.com/Unidata/netcdf-c/discussions/2214
The primary change is to support so-called "standard filters".
A standard filter is one that is defined by the following
netcdf-c API:
````
int nc_def_var_XXX(int ncid, int varid, size_t nparams, unsigned* params);
int nc_inq_var_XXXX(int ncid, int varid, int* usefilterp, unsigned* params);
````
So for example, zstandard would be a standard filter by defining
the functions *nc_def_var_zstandard* and *nc_inq_var_zstandard*.
In order to define these functions, we need a new dispatch function:
````
int nc_inq_filter_avail(int ncid, unsigned filterid);
````
This function, combined with the existing filter API can be used
to implement arbitrary standard filters using a simple code pattern.
Note that I would have preferred that this function return a list
of all available filters, but HDF5 does not support that functionality.
So this PR implements the dispatch function and implements
the following standard functions:
+ bzip2
+ zstandard
+ blosc
Specific test cases are also provided for HDF5 and NCZarr.
Over time, other specific standard filters will be defined.
## Primary Changes
* Add nc_inq_filter_avail() to netcdf-c API.
* Add standard filter implementations to test use of *nc_inq_filter_avail*.
* Bump the dispatch table version number and add to all the relevant
dispatch tables (libsrc, libsrcp, etc).
* Create a program to invoke nc_inq_filter_avail so that it is accessible
to shell scripts.
* Cleanup szip support to properly support szip
when HDF5 is disabled. This involves detecting
libsz separately from testing if HDF5 supports szip.
* Integrate shuffle and fletcher32 into the existing
filter API. This means that, for example, nc_def_var_fletcher32
is now a wrapper around nc_def_var_filter.
* Extend the Codec defaulting to allow multiple default shared libraries.
## Misc. Changes
* Modify configure.ac/CMakeLists.txt to look for the relevant
libraries implementing standard filters.
* Modify libnetcdf.settings to list available standard filters
(including deflate and szip).
* Add CMake test modules to locate libbz2 and libzstd.
* Cleanup the HDF5 memory manager function use in the plugins.
* remove unused file include//ncfilter.h
* remove tests for the HDF5 memory operations e.g. H5allocate_memory.
* Add flag to ncdump to force use of _Filter instead of _Deflate
or _Shuffle or _Fletcher32. Used for testing.
2022-03-15 02:39:37 +08:00
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var5:_Shuffle = "true" ;
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var5:_DeflateLevel = 2 ;
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2020-03-01 03:06:21 +08:00
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int var6(dim1) ;
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var6:_Storage = "compact" ;
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var6:_Endianness = "little" ;
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int var7 ;
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var7:_Storage = "compact" ;
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var7:_Endianness = "little" ;
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2010-06-03 21:24:43 +08:00
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// global attributes:
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2020-03-01 03:06:21 +08:00
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:_NCProperties = "version=2,netcdf=4.7.4-development,hdf5=1.10.4," ;
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2016-05-04 11:17:06 +08:00
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:_SuperblockVersion = 0 ;
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:_IsNetcdf4 = 1 ;
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2010-06-03 21:24:43 +08:00
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:_Format = "netCDF-4" ;
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data:
|
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|
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}
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