1 /* metaflac - Command-line FLAC metadata editor
2 * Copyright (C) 2001-2009 Josh Coalson
3 * Copyright (C) 2011-2022 Xiph.Org Foundation
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
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #ifdef HAVE_CONFIG_H
21 # include <config.h>
22 #endif
23
24 #include <errno.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() etc */
30
31 #include "operations_shorthand.h"
32
33 static FLAC__bool import_pic_from(const char *filename, FLAC__StreamMetadata **picture, const char *specification, FLAC__bool *needs_write);
34 static FLAC__bool export_pic_to(const char *filename, const FLAC__StreamMetadata *picture, const char *pic_filename);
35
do_shorthand_operation__picture(const char * filename,FLAC__Metadata_Chain * chain,const Operation * operation,FLAC__bool * needs_write)36 FLAC__bool do_shorthand_operation__picture(const char *filename, FLAC__Metadata_Chain *chain, const Operation *operation, FLAC__bool *needs_write)
37 {
38 FLAC__bool ok = true, has_type1 = false, has_type2 = false;
39 FLAC__StreamMetadata *picture = 0;
40 FLAC__Metadata_Iterator *iterator = FLAC__metadata_iterator_new();
41
42 if(0 == iterator)
43 die("out of memory allocating iterator");
44
45 FLAC__metadata_iterator_init(iterator, chain);
46
47 switch(operation->type) {
48 case OP__IMPORT_PICTURE_FROM:
49 ok = import_pic_from(filename, &picture, operation->argument.specification.value, needs_write);
50 if(ok) {
51 /* append PICTURE block */
52 while(FLAC__metadata_iterator_next(iterator))
53 ;
54 if(!FLAC__metadata_iterator_insert_block_after(iterator, picture)) {
55 print_error_with_chain_status(chain, "%s: ERROR: adding new PICTURE block to metadata", filename);
56 FLAC__metadata_object_delete(picture);
57 ok = false;
58 }
59 }
60 if(ok) {
61 /* check global PICTURE constraints (max 1 block each of type=1 and type=2) */
62 while(FLAC__metadata_iterator_prev(iterator))
63 ;
64 do {
65 FLAC__StreamMetadata *block = FLAC__metadata_iterator_get_block(iterator);
66 if(block->type == FLAC__METADATA_TYPE_PICTURE) {
67 if(block->data.picture.type == FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON_STANDARD) {
68 if(has_type1) {
69 print_error_with_chain_status(chain, "%s: ERROR: FLAC stream can only have one 32x32 standard icon (type=1) PICTURE block", filename);
70 ok = false;
71 }
72 has_type1 = true;
73 }
74 else if(block->data.picture.type == FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON) {
75 if(has_type2) {
76 print_error_with_chain_status(chain, "%s: ERROR: FLAC stream can only have one icon (type=2) PICTURE block", filename);
77 ok = false;
78 }
79 has_type2 = true;
80 }
81 }
82 } while(FLAC__metadata_iterator_next(iterator));
83 }
84 break;
85 case OP__EXPORT_PICTURE_TO:
86 {
87 const Argument_BlockNumber *a = operation->argument.export_picture_to.block_number_link;
88 int block_number = (a && a->num_entries > 0)? (int)a->entries[0] : -1;
89 unsigned i = 0;
90 do {
91 FLAC__StreamMetadata *block = FLAC__metadata_iterator_get_block(iterator);
92 if(block->type == FLAC__METADATA_TYPE_PICTURE && (block_number < 0 || i == (unsigned)block_number))
93 picture = block;
94 i++;
95 } while(FLAC__metadata_iterator_next(iterator) && 0 == picture);
96 if(0 == picture) {
97 if(block_number < 0)
98 flac_fprintf(stderr, "%s: ERROR: FLAC file has no PICTURE block\n", filename);
99 else
100 flac_fprintf(stderr, "%s: ERROR: FLAC file has no PICTURE block at block #%d\n", filename, block_number);
101 ok = false;
102 }
103 else
104 ok = export_pic_to(filename, picture, operation->argument.filename.value);
105 }
106 break;
107 default:
108 ok = false;
109 FLAC__ASSERT(0);
110 break;
111 };
112
113 FLAC__metadata_iterator_delete(iterator);
114 return ok;
115 }
116
117 /*
118 * local routines
119 */
120
import_pic_from(const char * filename,FLAC__StreamMetadata ** picture,const char * specification,FLAC__bool * needs_write)121 FLAC__bool import_pic_from(const char *filename, FLAC__StreamMetadata **picture, const char *specification, FLAC__bool *needs_write)
122 {
123 const char *error_message;
124
125 if(0 == specification || strlen(specification) == 0) {
126 flac_fprintf(stderr, "%s: ERROR: empty picture specification\n", filename);
127 return false;
128 }
129
130 *picture = grabbag__picture_parse_specification(specification, &error_message);
131
132 if(0 == *picture) {
133 flac_fprintf(stderr, "%s: ERROR: while parsing picture specification \"%s\": %s\n", filename, specification, error_message);
134 return false;
135 }
136
137 if(!FLAC__format_picture_is_legal(&(*picture)->data.picture, &error_message)) {
138 flac_fprintf(stderr, "%s: ERROR: new PICTURE block for \"%s\" is illegal: %s\n", filename, specification, error_message);
139 return false;
140 }
141
142 *needs_write = true;
143 return true;
144 }
145
export_pic_to(const char * filename,const FLAC__StreamMetadata * picture,const char * pic_filename)146 FLAC__bool export_pic_to(const char *filename, const FLAC__StreamMetadata *picture, const char *pic_filename)
147 {
148 FILE *f;
149 const FLAC__uint32 len = picture->data.picture.data_length;
150
151 if(0 == pic_filename || strlen(pic_filename) == 0) {
152 flac_fprintf(stderr, "%s: ERROR: empty export file name\n", filename);
153 return false;
154 }
155 if(0 == strcmp(pic_filename, "-"))
156 f = grabbag__file_get_binary_stdout();
157 else
158 f = flac_fopen(pic_filename, "wb");
159
160 if(0 == f) {
161 flac_fprintf(stderr, "%s: ERROR: can't open export file %s: %s\n", filename, pic_filename, strerror(errno));
162 return false;
163 }
164
165 if(fwrite(picture->data.picture.data, 1, len, f) != len) {
166 flac_fprintf(stderr, "%s: ERROR: writing PICTURE data to file\n", filename);
167 if(f != stdout)
168 fclose(f);
169 return false;
170 }
171
172 if(f != stdout)
173 fclose(f);
174
175 return true;
176 }
177