main.c

   1 /* main.c: thumbnail a blorb using embedded cover art
   2
   3    Copyright 2011 Lewis Gentry.
   4
   5    This program is free software: you can redistribute it and/or
   6    modify it under the terms of the GNU General Public License as
   7    published by the Free Software Foundation, either version 3 of the
   8    License, or (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful, but
  11    WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13    General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program. If not, see <http://www.gnu.org/licenses/>. */
  17
  18 #include "main.h"
  19 #include <stdlib.h>
  20
  21 #define DEFAULTSIZE 128 /* Maximum thumbnail size in pixels square. */
  22
  23 /* Main returns EXIT_SUCCESS only if we successfully produce the
  24    requested thumbnail. */
  25
  26 int main(int argc, char **argv)
  27 {
  28   FILE *blorb;
  29   unsigned int size, id, chunk, length;
  30
  31   size = argc > 3 ? strtol(argv[3], NULL, 0) : DEFAULTSIZE;
  32   if (size < 1 || argc < 3) {
  33     printf("Usage: %s <input> <output> [size]\n", argv[0]);
  34     return EXIT_FAILURE;
  35   }
  36
  37   blorb = fopen(argv[1], "rb");
  38   if (blorb && verify(blorb) && fspc(blorb, &id)) {
  39     chunk = findpict(blorb, id);
  40     length = chunklength(blorb, chunk);
  41     if (chunk && length && thumb(blorb, length, argv[2], size))
  42       return EXIT_SUCCESS;
  43   }
  44   return EXIT_FAILURE;
  45 }