src/metaflac/operations_shorthand_picture.c

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