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netcdf-c/cmake/modules/FindZstd.cmake

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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
# Searches for an installation of the zstd library. On success, it sets the following variables:
#
# Zstd_FOUND Set to true to indicate the zstd library was found
# Zstd_INCLUDE_DIRS The directory containing the header file zstd/zstd.h
# Zstd_LIBRARIES The libraries needed to use the zstd library
#
# To specify an additional directory to search, set Zstd_ROOT.
#
# Author: Siddhartha Chaudhuri, 2009
#
# Look for the header, first in the user-specified location and then in the system locations
SET(Zstd_INCLUDE_DOC "The directory containing the header file zstd.h")
FIND_PATH(Zstd_INCLUDE_DIRS NAMES zstd.h zstd/zstd.h PATHS ${Zstd_ROOT} ${Zstd_ROOT}/include DOC ${Zstd_INCLUDE_DOC} NO_DEFAULT_PATH)
IF(NOT Zstd_INCLUDE_DIRS) # now look in system locations
FIND_PATH(Zstd_INCLUDE_DIRS NAMES zstd.h zstd/zstd.h DOC ${Zstd_INCLUDE_DOC})
ENDIF(NOT Zstd_INCLUDE_DIRS)
SET(Zstd_FOUND FALSE)
IF(Zstd_INCLUDE_DIRS)
SET(Zstd_LIBRARY_DIRS ${Zstd_INCLUDE_DIRS})
IF("${Zstd_LIBRARY_DIRS}" MATCHES "/include$")
# Strip off the trailing "/include" in the path.
GET_FILENAME_COMPONENT(Zstd_LIBRARY_DIRS ${Zstd_LIBRARY_DIRS} PATH)
ENDIF("${Zstd_LIBRARY_DIRS}" MATCHES "/include$")
IF(EXISTS "${Zstd_LIBRARY_DIRS}/lib")
SET(Zstd_LIBRARY_DIRS ${Zstd_LIBRARY_DIRS}/lib)
ENDIF(EXISTS "${Zstd_LIBRARY_DIRS}/lib")
# Find Zstd libraries
FIND_LIBRARY(Zstd_DEBUG_LIBRARY NAMES zstdd zstd_d libzstdd libzstd_d libzstd
PATH_SUFFIXES Debug ${CMAKE_LIBRARY_ARCHITECTURE} ${CMAKE_LIBRARY_ARCHITECTURE}/Debug
PATHS ${Zstd_LIBRARY_DIRS} NO_DEFAULT_PATH)
FIND_LIBRARY(Zstd_RELEASE_LIBRARY NAMES zstd libzstd
PATH_SUFFIXES Release ${CMAKE_LIBRARY_ARCHITECTURE} ${CMAKE_LIBRARY_ARCHITECTURE}/Release
PATHS ${Zstd_LIBRARY_DIRS} NO_DEFAULT_PATH)
SET(Zstd_LIBRARIES )
IF(Zstd_DEBUG_LIBRARY AND Zstd_RELEASE_LIBRARY)
SET(Zstd_LIBRARIES debug ${Zstd_DEBUG_LIBRARY} optimized ${Zstd_RELEASE_LIBRARY})
ELSEIF(Zstd_DEBUG_LIBRARY)
SET(Zstd_LIBRARIES ${Zstd_DEBUG_LIBRARY})
ELSEIF(Zstd_RELEASE_LIBRARY)
SET(Zstd_LIBRARIES ${Zstd_RELEASE_LIBRARY})
ENDIF(Zstd_DEBUG_LIBRARY AND Zstd_RELEASE_LIBRARY)
IF(Zstd_LIBRARIES)
SET(Zstd_FOUND TRUE)
ENDIF(Zstd_LIBRARIES)
ENDIF(Zstd_INCLUDE_DIRS)
IF(Zstd_FOUND)
# IF(NOT Zstd_FIND_QUIETLY)
MESSAGE(STATUS "Found Zstd: headers at ${Zstd_INCLUDE_DIRS}, libraries at ${Zstd_LIBRARY_DIRS}")
MESSAGE(STATUS " library is ${Zstd_LIBRARIES}")
# ENDIF(NOT Zstd_FIND_QUIETLY)
ELSE(Zstd_FOUND)
IF(Zstd_FIND_REQUIRED)
MESSAGE(FATAL_ERROR "Zstd library not found")
ENDIF(Zstd_FIND_REQUIRED)
ENDIF(Zstd_FOUND)
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