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src/Source/LibJPEG/wrjpgcom.c  view on Meta::CPAN

	for (;;) {
	  comment_length = (unsigned int) strlen(comment_arg);
	  if (comment_length > 0 && comment_arg[comment_length-1] == '"') {
	    comment_arg[comment_length-1] = '\0'; /* zap terminating quote */
	    break;
	  }
	  if (++argn >= argc)
	    ERREXIT("Missing ending quote mark");
	  strcat(comment_arg, " ");
	  strcat(comment_arg, argv[argn]);
	}
      }
      comment_length = (unsigned int) strlen(comment_arg);
    } else
      usage();
  }

  /* Cannot use both -comment and -cfile. */
  if (comment_arg != NULL && comment_file != NULL)
    usage();
  /* If there is neither -comment nor -cfile, we will read the comment text
   * from stdin; in this case there MUST be an input JPEG file name.
   */
  if (comment_arg == NULL && comment_file == NULL && argn >= argc)
    usage();

  /* Open the input file. */
  if (argn < argc) {
    if ((infile = fopen(argv[argn], READ_BINARY)) == NULL) {
      fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
      exit(EXIT_FAILURE);
    }
  } else {
    /* default input file is stdin */
#ifdef USE_SETMODE		/* need to hack file mode? */
    setmode(fileno(stdin), O_BINARY);
#endif
#ifdef USE_FDOPEN		/* need to re-open in binary mode? */
    if ((infile = fdopen(fileno(stdin), READ_BINARY)) == NULL) {
      fprintf(stderr, "%s: can't open stdin\n", progname);
      exit(EXIT_FAILURE);
    }
#else
    infile = stdin;
#endif
  }

  /* Open the output file. */
#ifdef TWO_FILE_COMMANDLINE
  /* Must have explicit output file name */
  if (argn != argc-2) {
    fprintf(stderr, "%s: must name one input and one output file\n",
	    progname);
    usage();
  }
  if ((outfile = fopen(argv[argn+1], WRITE_BINARY)) == NULL) {
    fprintf(stderr, "%s: can't open %s\n", progname, argv[argn+1]);
    exit(EXIT_FAILURE);
  }
#else
  /* Unix style: expect zero or one file name */
  if (argn < argc-1) {
    fprintf(stderr, "%s: only one input file\n", progname);
    usage();
  }
  /* default output file is stdout */
#ifdef USE_SETMODE		/* need to hack file mode? */
  setmode(fileno(stdout), O_BINARY);
#endif
#ifdef USE_FDOPEN		/* need to re-open in binary mode? */
  if ((outfile = fdopen(fileno(stdout), WRITE_BINARY)) == NULL) {
    fprintf(stderr, "%s: can't open stdout\n", progname);
    exit(EXIT_FAILURE);
  }
#else
  outfile = stdout;
#endif
#endif /* TWO_FILE_COMMANDLINE */

  /* Collect comment text from comment_file or stdin, if necessary */
  if (comment_arg == NULL) {
    FILE * src_file;
    int c;

    comment_arg = (char *) malloc((size_t) MAX_COM_LENGTH);
    if (comment_arg == NULL)
      ERREXIT("Insufficient memory");
    comment_length = 0;
    src_file = (comment_file != NULL ? comment_file : stdin);
    while ((c = getc(src_file)) != EOF) {
      if (comment_length >= (unsigned int) MAX_COM_LENGTH) {
	fprintf(stderr, "Comment text may not exceed %u bytes\n",
		(unsigned int) MAX_COM_LENGTH);
	exit(EXIT_FAILURE);
      }
      comment_arg[comment_length++] = (char) c;
    }
    if (comment_file != NULL)
      fclose(comment_file);
  }

  /* Copy JPEG headers until SOFn marker;
   * we will insert the new comment marker just before SOFn.
   * This (a) causes the new comment to appear after, rather than before,
   * existing comments; and (b) ensures that comments come after any JFIF
   * or JFXX markers, as required by the JFIF specification.
   */
  marker = scan_JPEG_header(keep_COM);
  /* Insert the new COM marker, but only if nonempty text has been supplied */
  if (comment_length > 0) {
    write_marker(M_COM);
    write_2_bytes(comment_length + 2);
    while (comment_length > 0) {
      write_1_byte(*comment_arg++);
      comment_length--;
    }
  }
  /* Duplicate the remainder of the source file.
   * Note that any COM markers occuring after SOF will not be touched.
   */
  write_marker(marker);