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a2475e33a2
size_t parameters are now printed using lu after being cast to unsigned long (safe for C89). Tested on: 64-bit linux VM
258 lines
9.0 KiB
C
258 lines
9.0 KiB
C
/************************************************************
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This example illustrates the concept of virtual dataset.
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The program creates three 1-dim source datasets and writes
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data to them. Then it creates a 2-dim virtual dataset and
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maps the first three rows of the virtual dataset to the data
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in the source datasets. Elements of a row are mapped to all
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elements of the corresponding source dataset.
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The fourth row is not mapped and will be filled with the fill
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values when virtual dataset is read back.
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The program closes all datasets, and then reopens the virtual
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dataset, and finds and prints its creation properties.
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Then it reads the values.
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This file is intended for use with HDF5 Library version 1.10
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************************************************************/
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/* EIP Add link to the picture */
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#include "hdf5.h"
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#include <stdio.h>
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#include <stdlib.h>
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#define FILE "vds.h5"
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#define DATASET "VDS"
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#define VDSDIM1 6
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#define VDSDIM0 4
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#define DIM0 6
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#define RANK1 1
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#define RANK2 2
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const char *SRC_FILE[] = {
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"a.h5",
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"b.h5",
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"c.h5"
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};
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const char *SRC_DATASET[] = {
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"A",
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"B",
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"C"
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};
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int
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main (void)
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{
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hid_t file, space, src_space, vspace, dset; /* Handles */
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hid_t dcpl;
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herr_t status;
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hsize_t vdsdims[2] = {VDSDIM0, VDSDIM1}, /* Virtual datasets dimension */
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dims[1] = {DIM0}, /* Source datasets dimensions */
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start[2], /* Hyperslab parameters */
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stride[2],
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count[2],
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block[2];
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hsize_t start_out[2],
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stride_out[2],
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count_out[2],
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block_out[2];
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int wdata[DIM0], /* Write buffer for source dataset */
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rdata[VDSDIM0][VDSDIM1], /* Read buffer for virtual dataset */
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i, j, k, l;
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int fill_value = -1; /* Fill value for VDS */
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H5D_layout_t layout; /* Storage layout */
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size_t num_map; /* Number of mappings */
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ssize_t len; /* Length of the string; also a return value */
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char *filename;
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char *dsetname;
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hsize_t nblocks;
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hsize_t *buf; /* Buffer to hold hyperslab coordinates */
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/*
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* Create source files and datasets. This step is optional.
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*/
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for (i=0; i < 3; i++) {
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/*
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* Initialize data for i-th source dataset.
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*/
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for (j = 0; j < DIM0; j++) wdata[j] = i+1;
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/*
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* Create the source files and datasets. Write data to each dataset and
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* close all resources.
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*/
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file = H5Fcreate (SRC_FILE[i], H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
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space = H5Screate_simple (RANK1, dims, NULL);
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dset = H5Dcreate (file, SRC_DATASET[i], H5T_NATIVE_INT, space, H5P_DEFAULT,
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H5P_DEFAULT, H5P_DEFAULT);
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status = H5Dwrite (dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT,
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wdata);
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status = H5Sclose (space);
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status = H5Dclose (dset);
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status = H5Fclose (file);
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}
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/* Create file in which virtual dataset will be stored. */
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file = H5Fcreate (FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
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/* Create VDS dataspace. */
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space = H5Screate_simple (RANK2, vdsdims, NULL);
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/* Set VDS creation property. */
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dcpl = H5Pcreate (H5P_DATASET_CREATE);
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status = H5Pset_fill_value (dcpl, H5T_NATIVE_INT, &fill_value);
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/* Initialize hyperslab values. */
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start[0] = 0;
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start[1] = 0;
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count[0] = 1;
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count[1] = 1;
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block[0] = 1;
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block[1] = VDSDIM1;
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/*
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* Build the mappings.
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* Selections in the source datasets are H5S_ALL.
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* In the virtual dataset we select the first, the second and the third rows
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* and map each row to the data in the corresponding source dataset.
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*/
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src_space = H5Screate_simple (RANK1, dims, NULL);
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for (i = 0; i < 3; i++) {
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start[0] = (hsize_t)i;
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/* Select i-th row in the virtual dataset; selection in the source datasets is the same. */
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status = H5Sselect_hyperslab (space, H5S_SELECT_SET, start, NULL, count, block);
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status = H5Pset_virtual (dcpl, space, SRC_FILE[i], SRC_DATASET[i], src_space);
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}
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/* Create a virtual dataset. */
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dset = H5Dcreate (file, DATASET, H5T_NATIVE_INT, space, H5P_DEFAULT,
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dcpl, H5P_DEFAULT);
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status = H5Sclose (space);
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status = H5Sclose (src_space);
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status = H5Dclose (dset);
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status = H5Fclose (file);
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/*
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* Now we begin the read section of this example.
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*/
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/*
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* Open the file and virtual dataset.
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*/
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file = H5Fopen (FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
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dset = H5Dopen (file, DATASET, H5P_DEFAULT);
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/*
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* Get creation property list and mapping properties.
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*/
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dcpl = H5Dget_create_plist (dset);
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/*
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* Get storage layout.
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*/
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layout = H5Pget_layout (dcpl);
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if (H5D_VIRTUAL == layout)
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printf(" Dataset has a virtual layout \n");
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else
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printf(" Wrong layout found \n");
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/*
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* Find the number of mappings.
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*/
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status = H5Pget_virtual_count (dcpl, &num_map);
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printf(" Number of mappings is %lu\n", (unsigned long)num_map);
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/*
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* Get mapping parameters for each mapping.
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*/
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for (i = 0; i < (int)num_map; i++) {
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printf(" Mapping %d \n", i);
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printf(" Selection in the virtual dataset ");
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/* Get selection in the virttual dataset */
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vspace = H5Pget_virtual_vspace (dcpl, (size_t)i);
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/* Make sure that this is a hyperslab selection and then print information. */
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if (H5Sget_select_type(vspace) == H5S_SEL_HYPERSLABS) {
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nblocks = H5Sget_select_hyper_nblocks (vspace);
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buf = (hsize_t *)malloc(sizeof(hsize_t)*2*RANK2*nblocks);
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status = H5Sget_select_hyper_blocklist (vspace, (hsize_t)0, nblocks, buf);
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for (l=0; l<nblocks; l++) {
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printf("(");
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for (k=0; k<RANK2-1; k++)
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printf("%d,", (int)buf[k]);
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printf("%d ) - (", (int)buf[k]);
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for (k=0; k<RANK2-1; k++)
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printf("%d,", (int)buf[RANK2+k]);
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printf("%d)\n", (int)buf[RANK2+k]);
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}
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/* We also can use new APIs to get start, stride, count and block */
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if (H5Sis_regular_hyperslab(vspace)) {
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status = H5Sget_regular_hyperslab (vspace, start_out, stride_out, count_out, block_out);
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printf(" start = [%llu, %llu] \n", (unsigned long long)start_out[0], (unsigned long long)start_out[1]);
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printf(" stride = [%llu, %llu] \n", (unsigned long long)stride_out[0], (unsigned long long)stride_out[1]);
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printf(" count = [%llu, %llu] \n", (unsigned long long)count_out[0], (unsigned long long)count_out[1]);
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printf(" block = [%llu, %llu] \n", (unsigned long long)block_out[0], (unsigned long long)block_out[1]);
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}
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}
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/* Get source file name. */
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len = H5Pget_virtual_filename (dcpl, (size_t)i, NULL, 0);
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filename = (char *)malloc((size_t)len*sizeof(char)+1);
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H5Pget_virtual_filename (dcpl, (size_t)i, filename, len+1);
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printf(" Source filename %s\n", filename);
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/* Get source dataset name. */
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len = H5Pget_virtual_dsetname (dcpl, (size_t)i, NULL, 0);
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dsetname = (char *)malloc((size_t)len*sizeof(char)+1);
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H5Pget_virtual_dsetname (dcpl, (size_t)i, dsetname, len+1);
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printf(" Source dataset name %s\n", dsetname);
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/* Get selection in the source dataset. */
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printf(" Selection in the source dataset ");
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src_space = H5Pget_virtual_srcspace (dcpl, (size_t)i);
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/* Make sure it is ALL selection and then print the coordinates. */
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if(H5Sget_select_type(src_space) == H5S_SEL_ALL) {
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printf("(0) - (%d) \n", DIM0-1);
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}
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H5Sclose(vspace);
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H5Sclose(src_space);
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free(filename);
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free(dsetname);
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free(buf);
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}
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/* EIP Initialize read buffer with -2 since fille values for VDS are not implemented yet */
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for (i=0; i<VDSDIM0; i++) {
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for (j=0; j<VDSDIM1; j++)
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rdata[i][j] = -2;
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}
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/*
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* Read the data using the default properties.
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*/
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status = H5Dread (dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT,
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rdata[0]);
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/*
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* Output the data to the screen.
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*/
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printf (" VDS Data:\n");
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for (i=0; i<VDSDIM0; i++) {
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printf (" [");
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for (j=0; j<VDSDIM1; j++)
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printf (" %3d", rdata[i][j]);
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printf ("]\n");
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}
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/*
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* Close and release resources.
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*/
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status = H5Pclose (dcpl);
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status = H5Dclose (dset);
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status = H5Fclose (file);
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return 0;
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}
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