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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include "hdf5_hl.h"
#include <stdlib.h>
/*-------------------------------------------------------------------------
* Packet Table Fixed-Length Example
*
* Example program that creates a packet table and performs
* writes and reads.
*
*-------------------------------------------------------------------------
*/
int
main(void)
{
hid_t fid; /* File identifier */
hid_t ptable; /* Packet table identifier */
herr_t err; /* Function return status */
hsize_t count; /* Number of records in the table */
int x; /* Loop variable */
/* Buffers to hold data */
int writeBuffer[5];
int readBuffer[5];
/* Initialize buffers */
for (x = 0; x < 5; x++) {
writeBuffer[x] = x;
readBuffer[x] = -1;
}
/* Create a file using default properties */
fid = H5Fcreate("packet_table_FLexample.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/* Create a fixed-length packet table within the file */
/* This table's "packets" will be simple integers and it will use compression
* level 5. */
ptable = H5PTcreate_fl(fid, "Packet Test Dataset", H5T_NATIVE_INT, (hsize_t)100, 5);
if (ptable == H5I_INVALID_HID)
goto out;
/* Write one packet to the packet table */
err = H5PTappend(ptable, (hsize_t)1, &(writeBuffer[0]));
if (err < 0)
goto out;
/* Write several packets to the packet table */
err = H5PTappend(ptable, (hsize_t)4, &(writeBuffer[1]));
if (err < 0)
goto out;
/* Get the number of packets in the packet table. This should be five. */
err = H5PTget_num_packets(ptable, &count);
if (err < 0)
goto out;
printf("Number of packets in packet table after five appends: %d\n", (int)count);
/* Initialize packet table's "current record" */
err = H5PTcreate_index(ptable);
if (err < 0)
goto out;
/* Iterate through packets, read each one back */
for (x = 0; x < 5; x++) {
err = H5PTget_next(ptable, (hsize_t)1, &(readBuffer[x]));
if (err < 0)
goto out;
printf("Packet %d's value is %d\n", x, readBuffer[x]);
}
/* Close the packet table */
err = H5PTclose(ptable);
if (err < 0)
goto out;
/* Close the file */
H5Fclose(fid);
return 0;
out: /* An error has occurred. Clean up and exit. */
H5PTclose(ptable);
H5Fclose(fid);
return -1;
}
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