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Simplify code. Add usage.

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This commit is contained in:
rocky
2006-03-02 18:46:30 +00:00
parent d4ea2bfcaf
commit c2d5b7e0fe
4 changed files with 131 additions and 77 deletions
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56
example/C++/iso3.cpp
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@@ -1,7 +1,7 @@
/*
$Id: iso3.cpp,v 1.2 2005/11/10 11:22:55 rocky Exp $
$Id: iso3.cpp,v 1.3 2006/03/02 18:46:30 rocky Exp $
Copyright (C) 2004 Rocky Bernstein <rocky@panix.com>
Copyright (C) 2004, 2006 Rocky Bernstein <rocky@panix.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -20,6 +20,10 @@
/* Simple program to show using libiso9660 to extract a file from an
ISO-9660 image.
If a single argument is given, it is used as the ISO 9660 image to
use in the extraction. Otherwise a compiled in default ISO 9660 image
name (that comes with the libcdio distribution) will be used.
*/
/* This is the ISO 9660 image. */
@@ -56,6 +60,8 @@
#include <sys/types.h>
#endif
#define CEILING(x, y) ((x+(y-1))/y)
#define my_exit(rc) \
fclose (p_outfd); \
free(p_statbuf); \
@@ -67,34 +73,46 @@ main(int argc, const char *argv[])
{
iso9660_stat_t *p_statbuf;
FILE *p_outfd;
unsigned int i;
int i;
char const *psz_image;
char const *psz_fname;
iso9660_t *p_iso;
if (argc > 3) {
printf("usage %s [ISO9660-image.ISO [filename]]\n", argv[0]);
printf("Extracts filename from ISO-9660-image.ISO.\n");
return 1;
}
if (argc > 1)
psz_fname = argv[1];
psz_image = argv[1];
else
psz_fname = ISO9660_IMAGE;
psz_image = ISO9660_IMAGE;
p_iso = iso9660_open (psz_fname);
if (argc > 2)
psz_fname = argv[2];
else
psz_fname = LOCAL_FILENAME;
p_iso = iso9660_open (psz_image);
if (NULL == p_iso) {
fprintf(stderr, "Sorry, couldn't open ISO 9660 image %s\n", ISO9660_IMAGE);
fprintf(stderr, "Sorry, couldn't open ISO 9660 image %s\n", psz_image);
return 1;
}
p_statbuf = iso9660_ifs_stat_translate (p_iso, LOCAL_FILENAME);
p_statbuf = iso9660_ifs_stat_translate (p_iso, psz_fname);
if (NULL == p_statbuf)
{
fprintf(stderr,
"Could not get ISO-9660 file information for file %s\n",
LOCAL_FILENAME);
psz_fname);
iso9660_close(p_iso);
return 2;
}
if (!(p_outfd = fopen (LOCAL_FILENAME, "wb")))
if (!(p_outfd = fopen (psz_fname, "wb")))
{
perror ("fopen()");
free(p_statbuf);
@@ -103,22 +121,22 @@ main(int argc, const char *argv[])
}
/* Copy the blocks from the ISO-9660 filesystem to the local filesystem. */
for (i = 0; i < p_statbuf->size; i += ISO_BLOCKSIZE)
{
const unsigned int i_blocks = CEILING(p_statbuf->size, ISO_BLOCKSIZE);
for (i = 0; i < i_blocks ; i++)
{
char buf[ISO_BLOCKSIZE];
const lsn_t lsn = p_statbuf->lsn + i;
memset (buf, 0, ISO_BLOCKSIZE);
if ( ISO_BLOCKSIZE != iso9660_iso_seek_read (p_iso, buf, p_statbuf->lsn
+ (i / ISO_BLOCKSIZE),
1) )
if ( ISO_BLOCKSIZE != iso9660_iso_seek_read (p_iso, buf, lsn, 1) )
{
fprintf(stderr, "Error reading ISO 9660 file at lsn %lu\n",
(long unsigned int) p_statbuf->lsn + (i / ISO_BLOCKSIZE));
fprintf(stderr, "Error reading ISO 9660 file %s at LSN %lu\n",
psz_fname, (long unsigned int) lsn);
my_exit(4);
}
fwrite (buf, ISO_BLOCKSIZE, 1, p_outfd);
if (ferror (p_outfd))
@@ -127,6 +145,7 @@ main(int argc, const char *argv[])
my_exit(5);
}
}
}
fflush (p_outfd);
@@ -136,7 +155,8 @@ main(int argc, const char *argv[])
if (ftruncate (fileno (p_outfd), p_statbuf->size))
perror ("ftruncate()");
printf("Extraction of file 'copying' from %s successful.\n", ISO9660_IMAGE);
printf("Extraction of file '%s' from %s successful.\n",
psz_fname, psz_image);
my_exit(0);
}