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+/************************************************************
+
+ This example shows how to read and write data to a compact
+ dataset. The program first writes integers to a compact
+ dataset with dataspace dimensions of DIM0xDIM1, then
+ closes the file. Next, it reopens the file, reads back
+ the data, and outputs it to the screen.
+
+ This file is intended for use with HDF5 Library version 1.6
+
+ ************************************************************/
+
+#include "hdf5.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+#define FILE "h5ex_d_compact.h5"
+#define DATASET "DS1"
+#define DIM0 4
+#define DIM1 7
+
+int
+main(void)
+{
+ hid_t file, space, dset, dcpl; /* Handles */
+ herr_t status;
+ H5D_layout_t layout;
+ hsize_t dims[2] = {DIM0, DIM1};
+ int wdata[DIM0][DIM1], /* Write buffer */
+ rdata[DIM0][DIM1], /* Read buffer */
+ i, j;
+
+ /*
+ * Initialize data.
+ */
+ for (i = 0; i < DIM0; i++)
+ for (j = 0; j < DIM1; j++)
+ wdata[i][j] = i * j - j;
+
+ /*
+ * Create a new file using the default properties.
+ */
+ file = H5Fcreate(FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
+
+ /*
+ * Create dataspace. Setting maximum size to NULL sets the maximum
+ * size to be the current size.
+ */
+ space = H5Screate_simple(2, dims, NULL);
+
+ /*
+ * Create the dataset creation property list, set the layout to
+ * compact.
+ */
+ dcpl = H5Pcreate(H5P_DATASET_CREATE);
+ status = H5Pset_layout(dcpl, H5D_COMPACT);
+
+ /*
+ * Create the dataset. We will use all default properties for this
+ * example.
+ */
+ dset = H5Dcreate(file, DATASET, H5T_STD_I32LE, space, dcpl);
+
+ /*
+ * Write the data to the dataset.
+ */
+ status = H5Dwrite(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, wdata[0]);
+
+ /*
+ * Close and release resources.
+ */
+ status = H5Pclose(dcpl);
+ status = H5Dclose(dset);
+ status = H5Sclose(space);
+ status = H5Fclose(file);
+
+ /*
+ * Now we begin the read section of this example.
+ */
+
+ /*
+ * Open file and dataset using the default properties.
+ */
+ file = H5Fopen(FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
+ dset = H5Dopen(file, DATASET);
+
+ /*
+ * Retrieve the dataset creation property list, and print the
+ * storage layout.
+ */
+ dcpl = H5Dget_create_plist(dset);
+ layout = H5Pget_layout(dcpl);
+ printf("Storage layout for %s is: ", DATASET);
+ switch (layout) {
+ case H5D_COMPACT:
+ printf("H5D_COMPACT\n");
+ break;
+ case H5D_CONTIGUOUS:
+ printf("H5D_CONTIGUOUS\n");
+ break;
+ case H5D_CHUNKED:
+ printf("H5D_CHUNKED\n");
+ }
+
+ /*
+ * 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("%s:\n", DATASET);
+ for (i = 0; i < DIM0; i++) {
+ printf(" [");
+ for (j = 0; j < DIM1; j++)
+ printf(" %3d", rdata[i][j]);
+ printf("]\n");
+ }
+
+ /*
+ * Close and release resources.
+ */
+ status = H5Pclose(dcpl);
+ status = H5Dclose(dset);
+ status = H5Fclose(file);
+
+ return 0;
+}