src/metaflac/operations_shorthand_picture.c

   1 /* metaflac - Command-line FLAC metadata editor
   2  * Copyright (C) 2001,2002,2003,2004,2005,2006  Josh Coalson
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #if HAVE_CONFIG_H
  20 #  include <config.h>
  21 #endif
  22
  23 #include <errno.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include "options.h"
  27 #include "utils.h"
  28 #include "FLAC/assert.h"
  29 #include "share/grabbag.h" /* for grabbag__picture_parse_specification */
  30
  31 static FLAC__bool import_pic_from(const char *filename, FLAC__StreamMetadata **picture, const char *specification, FLAC__bool *needs_write);
  32
  33 FLAC__bool do_shorthand_operation__picture(const char *filename, FLAC__Metadata_Chain *chain, const Operation *operation, FLAC__bool *needs_write)
  34 {
  35         FLAC__bool ok = true, has_type1 = false, has_type2 = false;
  36         FLAC__StreamMetadata *picture = 0;
  37         FLAC__Metadata_Iterator *iterator = FLAC__metadata_iterator_new();
  38
  39         if(0 == iterator)
  40                 die("out of memory allocating iterator");
  41
  42         FLAC__metadata_iterator_init(iterator, chain);
  43
  44         switch(operation->type) {
  45                 case OP__IMPORT_PICTURE:
  46                         ok = import_pic_from(filename, &picture, operation->argument.specification.value, needs_write);
  47                         if(ok) {
  48                                 /* append PICTURE block */
  49                                 while(FLAC__metadata_iterator_next(iterator))
  50                                         ;
  51                                 if(!FLAC__metadata_iterator_insert_block_after(iterator, picture)) {
  52                                         print_error_with_chain_status(chain, "%s: ERROR: adding new PICTURE block to metadata", filename);
  53                                         FLAC__metadata_object_delete(picture);
  54                                         ok = false;
  55                                 }
  56                         }
  57                         break;
  58                 default:
  59                         ok = false;
  60                         FLAC__ASSERT(0);
  61                         break;
  62         };
  63
  64         /* check global PICTURE constraints (max 1 block each of type=1 and type=2) */
  65         while(FLAC__metadata_iterator_prev(iterator))
  66                 ;
  67         do {
  68                 FLAC__StreamMetadata *block = FLAC__metadata_iterator_get_block(iterator);
  69                 if(block->type == FLAC__METADATA_TYPE_PICTURE) {
  70                         if(block->data.picture.type == FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON_STANDARD) {
  71                                 if(has_type1) {
  72                                         print_error_with_chain_status(chain, "%s: ERROR: FLAC stream can only have one 32x32 standard icon (type=1) PICTURE block", filename);
  73                                         ok = false;
  74                                 }
  75                                 has_type1 = true;
  76                         }
  77                         else if(block->data.picture.type == FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON) {
  78                                 if(has_type2) {
  79                                         print_error_with_chain_status(chain, "%s: ERROR: FLAC stream can only have one icon (type=2) PICTURE block", filename);
  80                                         ok = false;
  81                                 }
  82                                 has_type2 = true;
  83                         }
  84                 }
  85         } while(FLAC__metadata_iterator_next(iterator));
  86
  87
  88         FLAC__metadata_iterator_delete(iterator);
  89         return ok;
  90 }
  91
  92 /*
  93  * local routines
  94  */
  95
  96 FLAC__bool import_pic_from(const char *filename, FLAC__StreamMetadata **picture, const char *specification, FLAC__bool *needs_write)
  97 {
  98         const char *error_message;
  99
 100         if(0 == specification || strlen(specification) == 0) {
 101                 fprintf(stderr, "%s: ERROR: empty picture specification\n", filename);
 102                 return false;
 103         }
 104
 105         *picture = grabbag__picture_parse_specification(specification, &error_message);
 106
 107         if(0 == *picture) {
 108                 fprintf(stderr, "%s: ERROR: while parsing picture specification \"%s\": %s\n", filename, specification, error_message);
 109                 return false;
 110         }
 111
 112         if(!FLAC__format_picture_is_legal(&(*picture)->data.picture, &error_message)) {
 113                 fprintf(stderr, "%s: ERROR: new PICTURE block for \"%s\" is illegal: %s\n", filename, specification, error_message);
 114                 return false;
 115         }
 116
 117         *needs_write = true;
 118         return true;
 119 }