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bf2746b8ea
re: issue https://github.com/Unidata/netcdf-c/issues/1251 Assume that you have the URL to a remote dataset which is a normal netcdf-3 or netcdf-4 file. This PR allows the netcdf-c to read that dataset's contents as a netcdf file using HTTP byte ranges if the remote server supports byte-range access. Originally, this PR was set up to access Amazon S3 objects, but it can also access other remote datasets such as those provided by a Thredds server via the HTTPServer access protocol. It may also work for other kinds of servers. Note that this is not intended as a true production capability because, as is known, this kind of access to can be quite slow. In addition, the byte-range IO drivers do not currently do any sort of optimization or caching. An additional goal here is to gain some experience with the Amazon S3 REST protocol. This architecture and its use documented in the file docs/byterange.dox. There are currently two test cases: 1. nc_test/tst_s3raw.c - this does a simple open, check format, close cycle for a remote netcdf-3 file and a remote netcdf-4 file. 2. nc_test/test_s3raw.sh - this uses ncdump to investigate some remote datasets. This PR also incorporates significantly changed model inference code (see the superceded PR https://github.com/Unidata/netcdf-c/pull/1259). 1. It centralizes the code that infers the dispatcher. 2. It adds support for byte-range URLs Other changes: 1. NC_HDF5_finalize was not being properly called by nc_finalize(). 2. Fix minor bug in ncgen3.l 3. fix memory leak in nc4info.c 4. add code to walk the .daprc triples and to replace protocol= fragment tag with a more general mode= tag. Final Note: Th inference code is still way too complicated. We need to move to the validfile() model used by netcdf Java, where each dispatcher is asked if it can process the file. This decentralizes the inference code. This will be done after all the major new dispatchers (PIO, Zarr, etc) have been implemented.
72 lines
2.4 KiB
Makefile
72 lines
2.4 KiB
Makefile
## This is a automake file, part of Unidata's netCDF package.
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# Copyright 2008, see the COPYRIGHT file for more information.
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# This Makefile controls the building of the dispatch layer of the
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# netCDF library. The dispatch layer decides whether to call the
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# netcdf-classic code, netcdf-4 code, nc3 dap code, or nc4 dap
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# code. It also contains code that sit above the dispatch layer, like
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# the v2 API.
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# Put together AM_CPPFLAGS and AM_LDFLAGS.
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include $(top_srcdir)/lib_flags.am
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# This is our output, the dispatch convenience library.
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noinst_LTLIBRARIES = libdispatch.la
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libdispatch_la_CPPFLAGS = ${AM_CPPFLAGS}
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# The source files.
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libdispatch_la_SOURCES = dparallel.c dcopy.c dfile.c ddim.c datt.c \
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dattinq.c dattput.c dattget.c derror.c dvar.c dvarget.c dvarput.c \
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dvarinq.c dinternal.c ddispatch.c dutf8.c nclog.c dstring.c ncuri.c \
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nclist.c ncbytes.c nchashmap.c nctime.c nc.c nclistmgr.c drc.c \
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dauth.c doffsets.c dwinpath.c dutil.c dreadonly.c dnotnc4.c dnotnc3.c \
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crc32.c crc32.h daux.c dinfermodel.c
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# Add the utf8 codebase
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libdispatch_la_SOURCES += utf8proc.c utf8proc.h
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# Add functions only found in netCDF-4.
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if USE_NETCDF4
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libdispatch_la_SOURCES += dgroup.c dvlen.c dcompound.c dtype.c denum.c \
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dopaque.c dfilter.c
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endif # USE_NETCDF4
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# Add V2 API convenience library if needed.
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if BUILD_V2
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noinst_LTLIBRARIES += libnetcdf2.la
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libnetcdf2_la_SOURCES = dv2i.c
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libnetcdf2_la_CPPFLAGS = ${AM_CPPFLAGS} -DDLL_EXPORT
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endif # BUILD_V2
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if ENABLE_HTTP
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libdispatch_la_SOURCES += dhttp.c
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endif # ENABLE_HTTP
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EXTRA_DIST=CMakeLists.txt ncsettings.hdr utf8proc_data.c
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# Build ncsettings.c as follows:
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# 1. copy ncsettings.hdr to ncsettings.c
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# 2. append libnetcdf.settings to ncsettings.c after
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# processing it as follows:
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# 1. convert tabs and cr to blanks
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# 2. convert embedded double quote (") to escaped form (\").
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# 3. append newline (\n) to each line
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# 4. surround each line with double quotes.
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# 3. finally, add a semicolon to the end of ncsettings.c
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# to complete the string constant.
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ncsettings.c: $(top_srcdir)/libnetcdf.settings ncsettings.hdr
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rm -f ncsettings.c
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cat ncsettings.hdr > ncsettings.c
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tr '\t\r' ' ' <${top_srcdir}/libnetcdf.settings | \
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sed -e 's/"/\\"/g' | \
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sed -e 's/\(.*\)/\"\1\\n\"/' | \
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cat >> ncsettings.c
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echo ';' >> ncsettings.c
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# Unit tests
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test_ncuri_SOURCES = test_ncuri.c ncuri.c ncbytes.c nclist.c
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test_pathcvt_SOURCES = test_pathcvt.c dwinpath.c
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check_PROGRAMS = test_ncuri test_pathcvt
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TESTS = test_ncuri test_pathcvt
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