mirror of
https://github.com/HDFGroup/hdf5.git
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427ff7da28
Bug Fix/Code Cleanup/Doc Cleanup/Optimization/Branch Sync :-)
Description:
Generally speaking, this is the "signed->unsigned" change to selections.
However, in the process of merging code back, things got stickier and stickier
until I ended up doing a big "sync the two branches up" operation. So... I
brought back all the "infrastructure" fixes from the development branch to the
release branch (which I think were actually making some improvement in
performance) as well as fixed several bugs which had been fixed in one branch,
but not the other.
I've also tagged the repository before making this checkin with the label
"before_signed_unsigned_changes".
Platforms tested:
FreeBSD 4.10 (sleipnir) w/parallel & fphdf5
FreeBSD 4.10 (sleipnir) w/threadsafe
FreeBSD 4.10 (sleipnir) w/backward compatibility
Solaris 2.7 (arabica) w/"purify options"
Solaris 2.8 (sol) w/FORTRAN & C++
AIX 5.x (copper) w/parallel & FORTRAN
IRIX64 6.5 (modi4) w/FORTRAN
Linux 2.4 (heping) w/FORTRAN & C++
Misc. update:
332 lines
11 KiB
C
332 lines
11 KiB
C
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Copyright by the Board of Trustees of the University of Illinois. *
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* All rights reserved. *
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* *
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* This file is part of HDF5. The full HDF5 copyright notice, including *
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* terms governing use, modification, and redistribution, is contained in *
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* the files COPYING and Copyright.html. COPYING can be found at the root *
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* of the source code distribution tree; Copyright.html can be found at the *
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* root level of an installed copy of the electronic HDF5 document set and *
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* is linked from the top-level documents page. It can also be found at *
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* http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have *
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* access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/*
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* This program shows how the H5Sselect_hyperslab and H5Sselect_elements
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* functions are used to write selected data from memory to the file.
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* Program takes 48 elements from the linear buffer and writes them into
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* the matrix using 3x2 blocks, (4,3) stride and (2,4) count.
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* Then four elements of the matrix are overwritten with the new values and
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* file is closed. Program reopens the file and selects the union of two
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* hyperslabs in the dataset in the file. Then it reads the selection into the
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* memory dataset preserving the shape of the selection.
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*/
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#include "hdf5.h"
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#define H5FILE_NAME "Select.h5"
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#define MSPACE1_RANK 1 /* Rank of the first dataset in memory */
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#define MSPACE1_DIM 50 /* Dataset size in memory */
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#define MSPACE2_RANK 1 /* Rank of the second dataset in memory */
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#define MSPACE2_DIM 4 /* Dataset size in memory */
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#define FSPACE_RANK 2 /* Dataset rank as it is stored in the file */
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#define FSPACE_DIM1 8 /* Dimension sizes of the dataset as it is
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stored in the file */
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#define FSPACE_DIM2 12
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/* We will read dataset back from the file
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to the dataset in memory with these
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dataspace parameters. */
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#define MSPACE_RANK 2
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#define MSPACE_DIM1 8
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#define MSPACE_DIM2 9
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#define NPOINTS 4 /* Number of points that will be selected
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and overwritten */
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int
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main (void)
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{
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hid_t file, dataset; /* File and dataset identifiers */
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hid_t mid1, mid2, mid, fid; /* Dataspace identifiers */
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hid_t plist; /* Dataset property list identifier */
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hsize_t dim1[] = {MSPACE1_DIM}; /* Dimension size of the first dataset
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(in memory) */
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hsize_t dim2[] = {MSPACE2_DIM}; /* Dimension size of the second dataset
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(in memory */
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hsize_t fdim[] = {FSPACE_DIM1, FSPACE_DIM2};
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/* Dimension sizes of the dataset (on disk) */
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hsize_t mdim[] = {MSPACE_DIM1, MSPACE_DIM2}; /* Dimension sizes of the
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dataset in memory when we
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read selection from the
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dataset on the disk */
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hsize_t start[2]; /* Start of hyperslab */
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hsize_t stride[2]; /* Stride of hyperslab */
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hsize_t count[2]; /* Block count */
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hsize_t block[2]; /* Block sizes */
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hsize_t coord[NPOINTS][FSPACE_RANK]; /* Array to store selected points
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from the file dataspace */
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herr_t ret;
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unsigned i,j;
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int fillvalue = 0; /* Fill value for the dataset */
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int matrix_out[MSPACE_DIM1][MSPACE_DIM2]; /* Buffer to read from the
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dataset */
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int vector[MSPACE1_DIM];
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int values[] = {53, 59, 61, 67}; /* New values to be written */
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/*
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* Buffers' initialization.
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*/
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vector[0] = vector[MSPACE1_DIM - 1] = -1;
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for (i = 1; i < MSPACE1_DIM - 1; i++) vector[i] = i;
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/*
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* Create a file.
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*/
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file = H5Fcreate(H5FILE_NAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
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/*
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* Create property list for a dataset and set up fill values.
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*/
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plist = H5Pcreate(H5P_DATASET_CREATE);
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ret = H5Pset_fill_value(plist, H5T_NATIVE_INT, &fillvalue);
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/*
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* Create dataspace for the dataset in the file.
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*/
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fid = H5Screate_simple(FSPACE_RANK, fdim, NULL);
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/*
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* Create dataset in the file. Notice that creation
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* property list plist is used.
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*/
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dataset = H5Dcreate(file, "Matrix in file", H5T_NATIVE_INT, fid, plist);
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/*
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* Select hyperslab for the dataset in the file, using 3x2 blocks,
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* (4,3) stride and (2,4) count starting at the position (0,1).
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*/
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start[0] = 0; start[1] = 1;
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stride[0] = 4; stride[1] = 3;
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count[0] = 2; count[1] = 4;
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block[0] = 3; block[1] = 2;
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ret = H5Sselect_hyperslab(fid, H5S_SELECT_SET, start, stride, count, block);
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/*
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* Create dataspace for the first dataset.
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*/
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mid1 = H5Screate_simple(MSPACE1_RANK, dim1, NULL);
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/*
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* Select hyperslab.
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* We will use 48 elements of the vector buffer starting at the second element.
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* Selected elements are 1 2 3 . . . 48
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*/
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start[0] = 1;
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stride[0] = 1;
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count[0] = 48;
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block[0] = 1;
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ret = H5Sselect_hyperslab(mid1, H5S_SELECT_SET, start, stride, count, block);
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/*
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* Write selection from the vector buffer to the dataset in the file.
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*
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* File dataset should look like this:
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* 0 1 2 0 3 4 0 5 6 0 7 8
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* 0 9 10 0 11 12 0 13 14 0 15 16
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* 0 17 18 0 19 20 0 21 22 0 23 24
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* 0 0 0 0 0 0 0 0 0 0 0 0
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* 0 25 26 0 27 28 0 29 30 0 31 32
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* 0 33 34 0 35 36 0 37 38 0 39 40
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* 0 41 42 0 43 44 0 45 46 0 47 48
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* 0 0 0 0 0 0 0 0 0 0 0 0
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*/
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ret = H5Dwrite(dataset, H5T_NATIVE_INT, mid1, fid, H5P_DEFAULT, vector);
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/*
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* Reset the selection for the file dataspace fid.
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*/
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ret = H5Sselect_none(fid);
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/*
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* Create dataspace for the second dataset.
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*/
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mid2 = H5Screate_simple(MSPACE2_RANK, dim2, NULL);
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/*
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* Select sequence of NPOINTS points in the file dataspace.
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*/
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coord[0][0] = 0; coord[0][1] = 0;
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coord[1][0] = 3; coord[1][1] = 3;
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coord[2][0] = 3; coord[2][1] = 5;
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coord[3][0] = 5; coord[3][1] = 6;
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ret = H5Sselect_elements(fid, H5S_SELECT_SET, NPOINTS,
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(const hsize_t **)coord);
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/*
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* Write new selection of points to the dataset.
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*/
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ret = H5Dwrite(dataset, H5T_NATIVE_INT, mid2, fid, H5P_DEFAULT, values);
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/*
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* File dataset should look like this:
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* 53 1 2 0 3 4 0 5 6 0 7 8
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* 0 9 10 0 11 12 0 13 14 0 15 16
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* 0 17 18 0 19 20 0 21 22 0 23 24
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* 0 0 0 59 0 61 0 0 0 0 0 0
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* 0 25 26 0 27 28 0 29 30 0 31 32
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* 0 33 34 0 35 36 67 37 38 0 39 40
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* 0 41 42 0 43 44 0 45 46 0 47 48
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* 0 0 0 0 0 0 0 0 0 0 0 0
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*
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*/
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/*
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* Close memory file and memory dataspaces.
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*/
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ret = H5Sclose(mid1);
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ret = H5Sclose(mid2);
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ret = H5Sclose(fid);
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/*
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* Close dataset.
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*/
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ret = H5Dclose(dataset);
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/*
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* Close the file.
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*/
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ret = H5Fclose(file);
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/*
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* Open the file.
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*/
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file = H5Fopen(H5FILE_NAME, H5F_ACC_RDONLY, H5P_DEFAULT);
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/*
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* Open the dataset.
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*/
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dataset = H5Dopen(file,"Matrix in file");
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/*
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* Get dataspace of the open dataset.
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*/
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fid = H5Dget_space(dataset);
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/*
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* Select first hyperslab for the dataset in the file. The following
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* elements are selected:
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* 10 0 11 12
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* 18 0 19 20
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* 0 59 0 61
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*
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*/
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start[0] = 1; start[1] = 2;
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block[0] = 1; block[1] = 1;
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stride[0] = 1; stride[1] = 1;
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count[0] = 3; count[1] = 4;
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ret = H5Sselect_hyperslab(fid, H5S_SELECT_SET, start, stride, count, block);
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/*
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* Add second selected hyperslab to the selection.
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* The following elements are selected:
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* 19 20 0 21 22
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* 0 61 0 0 0
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* 27 28 0 29 30
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* 35 36 67 37 38
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* 43 44 0 45 46
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* 0 0 0 0 0
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* Note that two hyperslabs overlap. Common elements are:
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* 19 20
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* 0 61
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*/
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start[0] = 2; start[1] = 4;
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block[0] = 1; block[1] = 1;
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stride[0] = 1; stride[1] = 1;
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count[0] = 6; count[1] = 5;
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ret = H5Sselect_hyperslab(fid, H5S_SELECT_OR, start, stride, count, block);
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/*
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* Create memory dataspace.
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*/
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mid = H5Screate_simple(MSPACE_RANK, mdim, NULL);
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/*
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* Select two hyperslabs in memory. Hyperslabs has the same
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* size and shape as the selected hyperslabs for the file dataspace.
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*/
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start[0] = 0; start[1] = 0;
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block[0] = 1; block[1] = 1;
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stride[0] = 1; stride[1] = 1;
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count[0] = 3; count[1] = 4;
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ret = H5Sselect_hyperslab(mid, H5S_SELECT_SET, start, stride, count, block);
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start[0] = 1; start[1] = 2;
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block[0] = 1; block[1] = 1;
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stride[0] = 1; stride[1] = 1;
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count[0] = 6; count[1] = 5;
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ret = H5Sselect_hyperslab(mid, H5S_SELECT_OR, start, stride, count, block);
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/*
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* Initialize data buffer.
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*/
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for (i = 0; i < MSPACE_DIM1; i++) {
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for (j = 0; j < MSPACE_DIM2; j++)
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matrix_out[i][j] = 0;
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}
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/*
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* Read data back to the buffer matrix_out.
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*/
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ret = H5Dread(dataset, H5T_NATIVE_INT, mid, fid,
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H5P_DEFAULT, matrix_out);
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/*
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* Display the result. Memory dataset is:
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*
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* 10 0 11 12 0 0 0 0 0
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* 18 0 19 20 0 21 22 0 0
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* 0 59 0 61 0 0 0 0 0
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* 0 0 27 28 0 29 30 0 0
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* 0 0 35 36 67 37 38 0 0
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* 0 0 43 44 0 45 46 0 0
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* 0 0 0 0 0 0 0 0 0
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* 0 0 0 0 0 0 0 0 0
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*/
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for (i=0; i < MSPACE_DIM1; i++) {
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for(j=0; j < MSPACE_DIM2; j++) printf("%3d ", matrix_out[i][j]);
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printf("\n");
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}
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/*
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* Close memory file and memory dataspaces.
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*/
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ret = H5Sclose(mid);
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ret = H5Sclose(fid);
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/*
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* Close dataset.
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*/
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ret = H5Dclose(dataset);
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/*
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* Close property list
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*/
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ret = H5Pclose(plist);
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/*
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* Close the file.
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*/
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ret = H5Fclose(file);
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return 0;
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}
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