Add program for extracting files from an ISO-9660 image. (Until we

change the iso9660_ifs_stat interface, names of files extracted have
to have version numbers, e.g. ;1 after them.

src/iso-read.c

@@ -0,0 +1,236 @@
+/*
+  $Id: iso-read.c,v 1.1 2004/02/25 10:03:27 rocky Exp $
+
+  Copyright (C) 2004 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
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+  
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+  
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+/* Program to read ISO-9660 images. */
+
+#include "util.h"
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+#include <sys/types.h>
+#include <cdio/cdio.h>
+#include <cdio/iso9660.h>
+
+#include <stdio.h>
+
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+/* Used by `main' to communicate with `parse_opt'. And global options
+ */
+struct arguments
+{
+  char          *file_name; 
+  char          *output_file; 
+  char          *iso9660_image; 
+  int            debug_level;
+} opts;
+
+/* Parse a options. */
+static bool
+parse_options (int argc, const char *argv[])
+{
+
+  int opt;
+
+  /* Configuration option codes */
+  enum {
+    OP_VERSION=1
+  };
+
+
+  /* Command-line options */
+  struct poptOption optionsTable[] = {
+  
+    {"debug",       'd', 
+     POPT_ARG_INT, &opts.debug_level, 0,
+     "Set debugging to LEVEL"},
+    
+    {"image", 'i', POPT_ARG_STRING, &opts.iso9660_image, 0,
+     "read from ISO-9660 image", "FILE"},
+    
+    {"extract", 'e', POPT_ARG_STRING, &opts.file_name, 0,
+     "extract FILE from ISO-9660 image", "FILE"},
+    
+    {"output-file",     'o', POPT_ARG_STRING, &opts.output_file, 0,
+     "Output file."},
+    
+    {"version", 'V', POPT_ARG_NONE, NULL, OP_VERSION,
+     "display version and copyright information and exit"},
+    POPT_AUTOHELP {NULL, 0, 0, NULL, 0}
+  };
+  poptContext optCon = poptGetContext (NULL, argc, argv, optionsTable, 0);
+  
+  program_name = strrchr(argv[0],'/');
+  program_name = program_name ? strdup(program_name+1) : strdup(argv[0]);
+
+  while ((opt = poptGetNextOpt (optCon)) != -1)
+    switch (opt)
+      {
+      case OP_VERSION:
+        print_version(program_name, VERSION, 0, true);
+	poptFreeContext(optCon);
+	free(program_name);
+        exit (EXIT_SUCCESS);
+        break;
+
+      default:
+        fprintf (stderr, "%s: %s\n", 
+                 poptBadOption(optCon, POPT_BADOPTION_NOALIAS),
+                 poptStrerror(opt));
+        fprintf (stderr, "error while parsing command line - try --help\n");
+	poptFreeContext(optCon);
+	free(program_name);
+        exit (EXIT_FAILURE);
+      }
+
+  {
+    const char *remaining_arg = poptGetArg(optCon);
+    if ( remaining_arg != NULL) {
+      if (opts.iso9660_image != NULL) {
+	fprintf (stderr, 
+		 "%s: Source specified as --image %s and as %s\n", 
+		 program_name, opts.iso9660_image, remaining_arg);
+	poptFreeContext(optCon);
+	free(program_name);
+	exit (EXIT_FAILURE);
+      }
+
+      opts.iso9660_image = strdup(remaining_arg);
+      
+      if ( (poptGetArgs(optCon)) != NULL) {
+	fprintf (stderr, 
+		 "%s: use only one unnamed argument for the ISO 9660 image name\n", 
+		 program_name);
+	poptFreeContext(optCon);
+	free(program_name);
+	exit (EXIT_FAILURE);
+	
+      }
+    }
+  }
+
+  poptFreeContext(optCon);
+
+  if (opts.iso9660_image == NULL) {
+    fprintf (stderr, 
+	     "%s: you need to specify an ISO-9660 image name. Try --help\n", 
+	     program_name);
+    exit (EXIT_FAILURE);
+  }
+
+  return true;
+}
+
+static void 
+init(void) 
+{
+  opts.debug_level   = 0;
+  opts.file_name     = NULL;
+  opts.output_file   = NULL;
+  opts.iso9660_image = NULL;
+}
+
+int
+main(int argc, const char *argv[])
+{
+  iso9660_stat_t *statbuf;
+  FILE *outfd;
+  int i;
+  
+  init();
+
+  /* Parse our arguments; every option seen by `parse_opt' will
+     be reflected in `arguments'. */
+  parse_options(argc, argv);
+     
+  iso9660_t *iso = iso9660_open (opts.iso9660_image);
+  
+  if (NULL == iso) {
+    fprintf(stderr, "Sorry, couldn't open ISO-9660 image %s\n", 
+	    opts.iso9660_image);
+    return 1;
+  }
+
+  statbuf = iso9660_ifs_stat (iso, opts.file_name);
+
+  if (NULL == statbuf) 
+    {
+      fprintf(stderr, 
+	      "Could not get ISO-9660 file information for file %s\n",
+	      opts.file_name);
+      return 2;
+    }
+
+  if (!(outfd = fopen (opts.output_file, "wb")))
+    {
+      perror ("fopen()");
+      return 3;
+    }
+
+  /* Copy the blocks from the ISO-9660 filesystem to the local filesystem. */
+  for (i = 0; i < statbuf->size; i += ISO_BLOCKSIZE)
+    {
+      char buf[ISO_BLOCKSIZE];
+
+      memset (buf, 0, ISO_BLOCKSIZE);
+      
+      if ( ISO_BLOCKSIZE != iso9660_iso_seek_read (iso, buf, statbuf->lsn 
+						   + (i / ISO_BLOCKSIZE),
+						   1) )
+      {
+	fprintf(stderr, "Error reading ISO 9660 file at lsn %lu\n",
+		(long unsigned int) statbuf->lsn + (i / ISO_BLOCKSIZE));
+	return 4;
+      }
+      
+      
+      fwrite (buf, ISO_BLOCKSIZE, 1, outfd);
+      
+      if (ferror (outfd))
+	{
+	  perror ("fwrite()");
+	  return 5;
+	}
+    }
+  
+  fflush (outfd);
+
+  /* Make sure the file size has the exact same byte size. Without the
+     truncate below, the file will a multiple of ISO_BLOCKSIZE.
+   */
+  if (ftruncate (fileno (outfd), statbuf->size))
+    perror ("ftruncate()");
+
+  fclose (outfd);
+  iso9660_close(iso);
+  return 0;
+}