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-rw-r--r--disk-utils/isosize.c167
1 files changed, 167 insertions, 0 deletions
diff --git a/disk-utils/isosize.c b/disk-utils/isosize.c
new file mode 100644
index 0000000..9299663
--- /dev/null
+++ b/disk-utils/isosize.c
@@ -0,0 +1,167 @@
+/*
+ * isosize.c - Andries Brouwer, 000608
+ *
+ * use header info to find size of iso9660 file system
+ * output a number - useful in scripts
+ *
+ * Synopsis:
+ * isosize [-x] [-d <num>] <filename>
+ * where "-x" gives length in sectors and sector size while
+ * without this argument the size is given in bytes
+ * without "-x" gives length in bytes unless "-d <num>" is
+ * given. In the latter case the length in bytes divided
+ * by <num> is given
+ *
+ * Version 2.03 2000/12/21
+ * - add "-d <num>" option and use long long to fix things > 2 GB
+ * Version 2.02 2000/10/11
+ * - error messages on IO failures [D. Gilbert]
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "nls.h"
+#include "c.h"
+#include "strutils.h"
+#include "closestream.h"
+#include "iso9660.h"
+
+#define ISOSIZE_EXIT_ALLFAILED 32
+#define ISOSIZE_EXIT_SOMEOK 64
+
+static int is_iso(int fd)
+{
+ char label[8];
+
+ if (pread(fd, &label, 8, 0x8000) == -1)
+ return 1;
+ return memcmp(&label, &"\1CD001\1", 8);
+}
+
+static int isosize(int argc, char *filenamep, int xflag, long divisor)
+{
+ int fd, nsecs, ssize, rc = -1;
+ unsigned char volume_space_size[8];
+ unsigned char logical_block_size[4];
+
+ if ((fd = open(filenamep, O_RDONLY)) < 0) {
+ warn(_("cannot open %s"), filenamep);
+ goto done;
+ }
+ if (is_iso(fd))
+ warnx(_("%s: might not be an ISO filesystem"), filenamep);
+
+ if (pread(fd, volume_space_size, sizeof(volume_space_size), 0x8050) != sizeof(volume_space_size) ||
+ pread(fd, logical_block_size, sizeof(logical_block_size), 0x8080) != sizeof(logical_block_size)) {
+ if (errno)
+ warn(_("read error on %s"), filenamep);
+ else
+ warnx(_("read error on %s"), filenamep);
+ goto done;
+ }
+
+ nsecs = isonum_733(volume_space_size, xflag);
+ /* isonum_723 returns nowadays always 2048 */
+ ssize = isonum_723(logical_block_size, xflag);
+
+ if (1 < argc)
+ printf("%s: ", filenamep);
+ if (xflag)
+ printf(_("sector count: %d, sector size: %d\n"), nsecs, ssize);
+ else {
+ long long product = nsecs;
+
+ if (divisor == 0)
+ printf("%lld\n", product * ssize);
+ else if (divisor == ssize)
+ printf("%d\n", nsecs);
+ else
+ printf("%lld\n", (product * ssize) / divisor);
+ }
+
+ rc = 0;
+done:
+ if (fd >= 0)
+ close(fd);
+ return rc;
+}
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+
+ fputs(USAGE_HEADER, stdout);
+ fprintf(stdout,
+ _(" %s [options] <iso9660_image_file> ...\n"),
+ program_invocation_short_name);
+
+ fputs(USAGE_SEPARATOR, stdout);
+ fputs(_("Show the length of an ISO-9660 filesystem.\n"), stdout);
+
+ fputs(USAGE_OPTIONS, stdout);
+ fputs(_(" -d, --divisor=<number> divide the amount of bytes by <number>\n"), stdout);
+ fputs(_(" -x, --sectors show sector count and size\n"), stdout);
+
+ printf(USAGE_HELP_OPTIONS(25));
+ printf(USAGE_MAN_TAIL("isosize(8)"));
+
+ exit(EXIT_SUCCESS);
+}
+
+int main(int argc, char **argv)
+{
+ int j, ct_err = 0, ct, opt, xflag = 0;
+ long divisor = 0;
+
+ static const struct option longopts[] = {
+ {"divisor", required_argument, NULL, 'd'},
+ {"sectors", no_argument, NULL, 'x'},
+ {"version", no_argument, NULL, 'V'},
+ {"help", no_argument, NULL, 'h'},
+ {NULL, 0, NULL, 0}
+ };
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ close_stdout_atexit();
+
+ while ((opt = getopt_long(argc, argv, "d:xVh", longopts, NULL)) != -1) {
+ switch (opt) {
+ case 'd':
+ divisor =
+ strtol_or_err(optarg,
+ _("invalid divisor argument"));
+ break;
+ case 'x':
+ xflag = 1;
+ break;
+ case 'V':
+ print_version(EXIT_SUCCESS);
+ case 'h':
+ usage();
+ default:
+ errtryhelp(EXIT_FAILURE);
+ }
+ }
+
+ ct = argc - optind;
+
+ if (ct <= 0) {
+ warnx(_("no device specified"));
+ errtryhelp(EXIT_FAILURE);
+ }
+
+ for (j = optind; j < argc; j++) {
+ if (isosize(ct, argv[j], xflag, divisor) != 0)
+ ct_err++;
+ }
+
+ return ct == ct_err ? ISOSIZE_EXIT_ALLFAILED : /* all failed */
+ ct_err ? ISOSIZE_EXIT_SOMEOK : /* some ok */
+ EXIT_SUCCESS; /* all success */
+}