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ccc70d640b
and https://github.com/Unidata/netcdf-c/issues/708 Expand the NC_INMEMORY capabilities to support writing and accessing the final modified memory. Three new functions have been added: nc_open_memio, nc_create_mem, and nc_close_memio. The following new capabilities were added. 1. nc_open_memio() allows the NC_WRITE mode flag so a chunk of memory can be passed in and be modified 2. nc_create_mem() allows the NC_INMEMORY flag to be set to cause the created file to be kept in memory. 3. nc_close_mem() allows the final in-memory contents to be retrieved at the time the file is closed. 4. A special flag, NC_MEMIO_LOCK, is provided to ensure that the provided memory will not be freed or reallocated. Note the following. 1. If nc_open_memio() is called with NC_WRITE, and NC_MEMIO_LOCK is not set, then the netcdf-c library will take control of the incoming memory. This means that the original memory block should not be freed but the block returned by nc_close_mem() must be freed. 2. If nc_open_memio() is called with NC_WRITE, and NC_MEMIO_LOCK is set, then modifications to the original memory may fail if the space available is insufficient. Documentation is provided in the file docs/inmemory.md. A test case is provided: nc_test/tst_inmemory.c driven by nc_test/run_inmemory.sh WARNING: changes were made to the dispatch table for the close entry. From int (*close)(int) to int (*close)(int,void*).
51 lines
1.1 KiB
C
51 lines
1.1 KiB
C
/*********************************************************************
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* Copyright 2016, UCAR/Unidata
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* See netcdf/COPYRIGHT file for copying and redistribution conditions.
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*********************************************************************/
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#ifndef _NCD4DISPATCH_H
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#define _NCD4DISPATCH_H
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#include <stddef.h> /* size_t, ptrdiff_t */
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#include "netcdf.h"
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#include "ncdispatch.h"
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#if defined(__cplusplus)
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extern "C" {
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#endif
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extern int
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NCD4_open(const char *path, int mode,
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int basepe, size_t *chunksizehintp,
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int use_parallel, void* mpidata,
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struct NC_Dispatch* dispatch, NC* ncp);
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extern int
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NCD4_close(int ncid,void*);
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extern int
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NCD4_abort(int ncid);
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extern int
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NCD4_inq_dim(int ncid, int dimid, char* name, size_t* lenp);
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extern int
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NCD4_get_vara(int ncid, int varid,
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const size_t *start, const size_t *edges,
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void *value,
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nc_type memtype);
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extern int
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NCD4_get_vars(int ncid, int varid,
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const size_t *start, const size_t *edges, const ptrdiff_t* strides,
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void *value,
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nc_type memtype);
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extern int NCD4_initialize(void);
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#if defined(__cplusplus)
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}
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#endif
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#endif /*_NCD4DISPATCH_H*/
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