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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 HDF. The full HDF 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/HDF/releases/. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
** FILE
** hdfunpac.c
** USAGE
** hdfunpac [options] <hdffile>
** DESCRIPTION
** This program unpacks an HDF file by exporting the scientific data
** elements (DFTAG_SD) to external object elements.
** Options are:
** -d <datafile> Use <datafile> as the external filename.
** Default is "DataFile".
*/
#include "hdf.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef H4_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef H4_HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#define DefaultDatafile "DataFile"
/* Prototypes declaration */
int main(int, char *a[]);
void hdferror(void);
void error(const char *);
void usage(void);
/* variables */
char *progname; /* the name this program is invoked, i.e. argv[0] */
int
main(int argc, char *argv[])
{
int32 infile, aid, ret;
char *filename;
char datafilename[DF_MAXFNLEN];
uint16 tag;
uint16 ref;
int32 offset, fileoffset;
int32 length;
int16 special;
/* Get invocation name of program */
progname = *argv++;
argc--;
/* parse arguments */
while (argc > 0 && **argv == '-') {
switch ((*argv)[1]) {
case 'd':
argc--;
argv++;
if (argc > 0) {
strcpy(datafilename, *argv++);
argc--;
}
else {
usage();
exit(1);
}
break;
default:
usage();
exit(1);
}
}
if (argc == 1) {
filename = *argv++;
argc--;
}
else {
usage();
exit(1);
}
if (datafilename[0] == '\0')
strcpy(datafilename, DefaultDatafile);
/* Check to make sure input file is HDF */
ret = (int)Hishdf(filename);
if (ret == FALSE) {
error("given file is not an HDF file\n");
}
/* check if datafile already exists. If so, set offset to its length. */
{
struct stat buf;
if (stat(datafilename, &buf) == 0) {
printf("External file %s already exists. Using append mode.\n", datafilename);
fileoffset = (int32)buf.st_size;
}
else
fileoffset = 0;
}
/* Open HDF file */
infile = Hopen(filename, DFACC_RDWR, 0);
if (infile == FAIL) {
error("Can't open the HDF file\n");
}
/* Process the file */
ret = aid = Hstartread(infile, DFTAG_SD, DFREF_WILDCARD);
while (ret != FAIL) {
/*
* Get data about the current one
*/
ret = Hinquire(aid, NULL, &tag, &ref, &length, &offset, NULL, NULL, &special);
/* check the tag value since external element object are returned the same. */
if (tag == DFTAG_SD) {
printf("moving Scientific Data (%d,%d) to %s\n", tag, ref, datafilename);
ret = HXcreate(infile, tag, ref, datafilename, fileoffset, length);
fileoffset += length;
}
/*
* Move to the next one
*/
ret = Hnextread(aid, DFTAG_SD, DFREF_WILDCARD, DF_CURRENT);
}
/*
* Close the access element
*/
ret = Hendaccess(aid);
if (ret == FAIL)
hdferror();
/* done; close files */
Hclose(infile);
return (0);
}
/*
** NAME
** hdferror -- print out HDF error number
** USAGE
** int hdferror()
** RETURNS
** none
** DESCRIPTION
** Print an HDF error number to stderr.
** GLOBAL VARIABLES
** COMMENTS, BUGS, ASSUMPTIONS
** This routine terminates the program with code 1.
** EXAMPLES
*/
void
hdferror(void)
{
HEprint(stderr, 0);
exit(1);
}
/*
** NAME
** error -- print error to stderr
** USAGE
** int error(string);
** char *string; IN: pointer to error description string
** RETURNS
** none
** DESCRIPTION
** Print an HDF error number to stderr.
** GLOBAL VARIABLES
** COMMENTS, BUGS, ASSUMPTIONS
** This routine terminates the program with code 1.
** EXAMPLES
*/
void
error(const char *string)
{
fprintf(stderr, "%s: %s\n", progname, string);
exit(1);
}
void
usage(void)
{
fprintf(stderr, "Usage: %s [-d <datafilename>] <hdffile>\n", progname);
}
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