[svn-r26268] Added VDS example.

I ran bin/reconfigure on jam and it modified test/Makefile.in. May be Neil fixed Makefile.am,
but didn't run reconfigure?

Tested on jam.

1 files changed, 244 insertions, 0 deletions

diff --git a/examples/h5_vds.c b/examples/h5_vds.c
new file mode 100644
index 0000000..ed30b5b
--- /dev/null
+++ b/examples/h5_vds.c
@@ -0,0 +1,244 @@
+/************************************************************
+
+  This example illustrates the concept of the virtual dataset.
+  The program  creates three 1-dim source datasets and writes
+  data to them. Then it creates 2-dim virtual dataset and
+  maps the first three rows of the virtual dataset to the data 
+  in the source datasets. Elements of a row are mapped to all 
+  elements of the corresponding source dataset.
+  The fourth row is not mapped and will be filled with the fill 
+  values when virtual dataset is read back. 
+   
+  The program closes all datasets, and then reopens the virtual
+  dataset, and finds and prints its creation properties.
+  Then it reads the values. 
+
+  This file is intended for use with HDF5 Library version 1.10
+
+ ************************************************************/
+
+#include "hdf5.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+#define FILE         "vds.h5"
+#define DATASET      "VDS"
+#define VDSDIM1         6 
+#define VDSDIM0         4 
+#define DIM0            6 
+#define RANK1           1
+#define RANK2           2
+
+const char *SRC_FILE[] = {
+    "a.h5",
+    "b.h5",
+    "c.h5"
+};
+
+const char *SRC_DATASET[] = {
+    "A",
+    "B",
+    "C"
+};
+
+int
+main (void)
+{
+    hid_t        file, space, src_space, vspace, dset; /* Handles */ 
+    hid_t        dcpl;
+    herr_t       status;
+    hsize_t      vdsdims[2] = {VDSDIM0, VDSDIM1},      /* Datasets dimension */
+                 dims[1] = {DIM0},
+                 start[2],                   /* Hyperslab parameters */
+                 stride[2],
+                 count[2],
+                 block[2];
+    int          wdata[DIM0],                /* Write buffer for source dataset */
+                 rdata[VDSDIM0][VDSDIM1],    /* Read buffer for virtual dataset */
+                 i, j, k, l;  
+    int          fill_value = -1;            /* Fill value for VDS */
+    H5D_layout_t layout;                     /* Storage layout */
+    size_t       num_map;                    /* Number of mappings */
+    ssize_t      len;                        /* Length of the string; also a return value */
+    char         *filename;                  
+    char         *dsetname;
+    hsize_t      nblocks;
+    hsize_t      *buf;                       /* Buffer to hold hyperslab coordinates */
+
+    /*
+     * Create source files and datasets. This step is optional.
+     */
+    for (i=0; i < 3; i++) {
+        /*
+         * Initialize data for i-th source dataset.
+         */
+        for (j = 0; j < DIM0; j++) wdata[j] = i+1;
+        
+       /*
+	* Create the source files and  datasets. Write data to each dataset and 
+        * close all resources.
+        */
+
+        file = H5Fcreate (SRC_FILE[i], H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
+        space = H5Screate_simple (RANK1, dims, NULL);
+        dset = H5Dcreate (file, SRC_DATASET[i], H5T_NATIVE_INT, space, H5P_DEFAULT,
+                    H5P_DEFAULT, H5P_DEFAULT);
+        status = H5Dwrite (dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT,
+                    wdata);
+        status = H5Sclose (space);
+        status = H5Dclose (dset);
+        status = H5Fclose (file);
+   }
+
+    file = H5Fcreate (FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
+
+    /* Create VDS dataspace.  */
+    space = H5Screate_simple (RANK2, vdsdims, NULL);
+    src_space = H5Screate_simple (RANK1, dims, NULL);
+
+    /* Create VDS creation property */
+    dcpl = H5Pcreate (H5P_DATASET_CREATE);
+    status = H5Pset_fill_value (dcpl, H5T_NATIVE_INT, &fill_value);
+     
+    /* Initialize hyperslab values */
+    start[0] = 0;
+    start[1] = 0;
+    count[0] = 1;
+    count[1] = 1;
+    block[0] = 1;
+    block[1] = VDSDIM1;
+
+    /* 
+     * Build the mappings.
+     *
+     * Select the first, the second and the third rows and map each row to the data in the
+     * corresponding source datasets.
+     */
+    for (i = 0; i < 3; i++) {
+        start[0] = (hsize_t)i;
+        /* Select i-th row in the virtual dataset; selection in the source datasets is the same. */
+        status = H5Sselect_hyperslab (space, H5S_SELECT_SET, start, NULL, count, block);
+        status = H5Pset_virtual (dcpl, space, SRC_FILE[i], SRC_DATASET[i], src_space);
+        status = H5Sselect_none (space);
+    }
+
+    /* Create a virtual dataset */
+    dset = H5Dcreate (file, DATASET, H5T_NATIVE_INT, space, H5P_DEFAULT,
+                dcpl, H5P_DEFAULT);
+    status = H5Sclose (space);
+    status = H5Sclose (src_space);
+    status = H5Dclose (dset);
+    status = H5Fclose (file);    
+     
+    /*
+     * Now we begin the read section of this example.
+     */
+
+    /*
+     * Open file and virtual dataset using the default properties.
+     */
+    file = H5Fopen (FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
+    dset = H5Dopen (file, DATASET, H5P_DEFAULT);
+
+    /*
+     * Get creation property list and mapping properties.
+     */
+    dcpl = H5Dget_create_plist (dset);
+
+    /*
+     * Get storage layout.
+     */
+    layout = H5Pget_layout (dcpl);
+    if (H5D_VIRTUAL == layout) 
+        printf(" Dataset has a virtual layout \n");
+    else
+        printf("Wrong layout found \n");
+
+     /*
+      * Find number of mappings.
+      */
+     status = H5Pget_virtual_count (dcpl, &num_map);
+     printf("Number of mappings is %d\n", num_map);
+
+     /* 
+      * Get mapping parameters for each mapping.
+      */
+    for (i = 0; i < (int)num_map; i++) {   
+        printf("Mapping %d \n", i);
+        printf("         Selection in the virtual dataset ");
+        /* Get selection in the virttual  dataset */
+        vspace = H5Pget_virtual_vspace (dcpl, (size_t)i);
+
+        /* Make sure that this is a hyperslab selection and then print information. */
+        if (H5Sget_select_type(vspace) == H5S_SEL_HYPERSLABS) { 
+            nblocks = H5Sget_select_hyper_nblocks (vspace);
+            buf = (hsize_t *)malloc(sizeof(hsize_t)*2*RANK2*nblocks);
+            status = H5Sget_select_hyper_blocklist (vspace, (hsize_t)0, nblocks, buf);
+            for (l=0; l<nblocks; l++) {
+                printf("(");
+                for (k=0; k<RANK2-1; k++) printf("%d,", (int)buf[k]);
+                printf("%d", (int)buf[k]);
+                printf(") - ");
+                printf("(");
+                for (k=0; k<RANK2-1; k++) printf("%d,", (int)buf[RANK2+k]);
+                printf("%d", (int)buf[RANK2+k]);
+                printf(")");
+                printf ("\n");
+            }
+        }
+        /* Get source file name */
+        len = H5Pget_virtual_filename (dcpl, (size_t)i, NULL, 0);
+        filename = (char *)malloc((size_t)len*sizeof(char)+1);
+        H5Pget_virtual_filename (dcpl, (size_t)i, filename, len+1);
+        printf("         Source filename %s\n", filename);
+
+        /* Get source dataset name */
+        len = H5Pget_virtual_dsetname (dcpl, (size_t)i, NULL, 0);
+        dsetname = (char *)malloc((size_t)len*sizeof(char)+1);
+        H5Pget_virtual_dsetname (dcpl, (size_t)i, dsetname, len+1);
+        printf("         Source dataset name %s\n", dsetname);
+
+        /* Get selection in the source dataset */
+        printf("         Selection in the source dataset ");
+        src_space = H5Pget_virtual_srcspace (dcpl, (size_t)i);
+
+        /* Make sure it is ALL selection and then print the coordinates */
+        if(H5Sget_select_type(src_space) == H5S_SEL_ALL) {
+                printf("(0) - (%d)", DIM0-1);
+                printf ("\n");
+        }
+        H5Sclose(vspace);
+        H5Sclose(src_space);
+        free(filename);
+        free(dsetname);
+        free(buf);
+    }
+
+#ifdef LATER
+    /*
+     * Read the data using the default properties.
+     */
+    status = H5Dread (dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT,
+                rdata[0]);
+
+    /*
+     * Output the data to the screen.
+     */
+    printf (" VDS Data:\n");
+    for (i=0; i<VDSDIM0; i++) {
+        printf (" [");
+        for (j=0; j<VDSDIM1; j++)
+            printf (" %3d", rdata[i][j]);
+        printf ("]\n");
+    }
+#endif 
+    /*
+     * Close and release resources.
+     */
+    status = H5Pclose (dcpl);
+    status = H5Dclose (dset);
+    status = H5Fclose (file);
+
+    return 0;
+}
+