src/metaflac/operations_shorthand_picture.c

   1 /* metaflac - Command-line FLAC metadata editor
   2  * Copyright (C) 2001,2002,2003,2004,2005,2006,2007,2008  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 <string.h>
  25 #include "options.h"
  26 #include "utils.h"
  27 #include "FLAC/assert.h"
  28 #include "share/grabbag.h" /* for grabbag__picture_parse_specification() etc */
  29
  30 #include "operations_shorthand.h"
  31
  32 static FLAC__bool import_pic_from(const char *filename, FLAC__StreamMetadata **picture, const char *specification, FLAC__bool *needs_write);
  33 static FLAC__bool export_pic_to(const char *filename, const FLAC__StreamMetadata *picture, const char *pic_filename);
  34
  35 FLAC__bool do_shorthand_operation__picture(const char *filename, FLAC__Metadata_Chain *chain, const Operation *operation, FLAC__bool *needs_write)
  36 {
  37         FLAC__bool ok = true, has_type1 = false, has_type2 = false;
  38         FLAC__StreamMetadata *picture = 0;
  39         FLAC__Metadata_Iterator *iterator = FLAC__metadata_iterator_new();
  40
  41         if(0 == iterator)
  42                 die("out of memory allocating iterator");
  43
  44         FLAC__metadata_iterator_init(iterator, chain);
  45
  46         switch(operation->type) {
  47                 case OP__IMPORT_PICTURE_FROM:
  48                         ok = import_pic_from(filename, &picture, operation->argument.specification.value, needs_write);
  49                         if(ok) {
  50                                 /* append PICTURE block */
  51                                 while(FLAC__metadata_iterator_next(iterator))
  52                                         ;
  53                                 if(!FLAC__metadata_iterator_insert_block_after(iterator, picture)) {
  54                                         print_error_with_chain_status(chain, "%s: ERROR: adding new PICTURE block to metadata", filename);
  55                                         FLAC__metadata_object_delete(picture);
  56                                         ok = false;
  57                                 }
  58                         }
  59                         if(ok) {
  60                                 /* check global PICTURE constraints (max 1 block each of type=1 and type=2) */
  61                                 while(FLAC__metadata_iterator_prev(iterator))
  62                                         ;
  63                                 do {
  64                                         FLAC__StreamMetadata *block = FLAC__metadata_iterator_get_block(iterator);
  65                                         if(block->type == FLAC__METADATA_TYPE_PICTURE) {
  66                                                 if(block->data.picture.type == FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON_STANDARD) {
  67                                                         if(has_type1) {
  68                                                                 print_error_with_chain_status(chain, "%s: ERROR: FLAC stream can only have one 32x32 standard icon (type=1) PICTURE block", filename);
  69                                                                 ok = false;
  70                                                         }
  71                                                         has_type1 = true;
  72                                                 }
  73                                                 else if(block->data.picture.type == FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON) {
  74                                                         if(has_type2) {
  75                                                                 print_error_with_chain_status(chain, "%s: ERROR: FLAC stream can only have one icon (type=2) PICTURE block", filename);
  76                                                                 ok = false;
  77                                                         }
  78                                                         has_type2 = true;
  79                                                 }
  80                                         }
  81                                 } while(FLAC__metadata_iterator_next(iterator));
  82                         }
  83                         break;
  84                 case OP__EXPORT_PICTURE_TO:
  85                         {
  86                                 const Argument_BlockNumber *a = operation->argument.export_picture_to.block_number_link;
  87                                 int block_number = (a && a->num_entries > 0)? (int)a->entries[0] : -1;
  88                                 unsigned i = 0;
  89                                 do {
  90                                         FLAC__StreamMetadata *block = FLAC__metadata_iterator_get_block(iterator);
  91                                         if(block->type == FLAC__METADATA_TYPE_PICTURE && (block_number < 0 || i == (unsigned)block_number))
  92                                                 picture = block;
  93                                         i++;
  94                                 } while(FLAC__metadata_iterator_next(iterator) && 0 == picture);
  95                                 if(0 == picture) {
  96                                         if(block_number < 0)
  97                                                 fprintf(stderr, "%s: ERROR: FLAC file has no PICTURE block\n", filename);
  98                                         else
  99                                                 fprintf(stderr, "%s: ERROR: FLAC file has no PICTURE block at block #%d\n", filename, block_number);
 100                                         ok = false;
 101                                 }
 102                                 else
 103                                         ok = export_pic_to(filename, picture, operation->argument.filename.value);
 104                         }
 105                         break;
 106                 default:
 107                         ok = false;
 108                         FLAC__ASSERT(0);
 109                         break;
 110         };
 111
 112         FLAC__metadata_iterator_delete(iterator);
 113         return ok;
 114 }
 115
 116 /*
 117  * local routines
 118  */
 119
 120 FLAC__bool import_pic_from(const char *filename, FLAC__StreamMetadata **picture, const char *specification, FLAC__bool *needs_write)
 121 {
 122         const char *error_message;
 123
 124         if(0 == specification || strlen(specification) == 0) {
 125                 fprintf(stderr, "%s: ERROR: empty picture specification\n", filename);
 126                 return false;
 127         }
 128
 129         *picture = grabbag__picture_parse_specification(specification, &error_message);
 130
 131         if(0 == *picture) {
 132                 fprintf(stderr, "%s: ERROR: while parsing picture specification \"%s\": %s\n", filename, specification, error_message);
 133                 return false;
 134         }
 135
 136         if(!FLAC__format_picture_is_legal(&(*picture)->data.picture, &error_message)) {
 137                 fprintf(stderr, "%s: ERROR: new PICTURE block for \"%s\" is illegal: %s\n", filename, specification, error_message);
 138                 return false;
 139         }
 140
 141         *needs_write = true;
 142         return true;
 143 }
 144
 145 FLAC__bool export_pic_to(const char *filename, const FLAC__StreamMetadata *picture, const char *pic_filename)
 146 {
 147         FILE *f;
 148         const FLAC__uint32 len = picture->data.picture.data_length;
 149
 150         if(0 == pic_filename || strlen(pic_filename) == 0) {
 151                 fprintf(stderr, "%s: ERROR: empty export file name\n", filename);
 152                 return false;
 153         }
 154         if(0 == strcmp(pic_filename, "-"))
 155                 f = grabbag__file_get_binary_stdout();
 156         else
 157                 f = fopen(pic_filename, "wb");
 158
 159         if(0 == f) {
 160                 fprintf(stderr, "%s: ERROR: can't open export file %s: %s\n", filename, pic_filename, strerror(errno));
 161                 return false;
 162         }
 163
 164         if(fwrite(picture->data.picture.data, 1, len, f) != len) {
 165                 fprintf(stderr, "%s: ERROR: writing PICTURE data to file\n", filename);
 166                 return false;
 167         }
 168
 169         if(f != stdout)
 170                 fclose(f);
 171
 172         return true;
 173 }