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/* metaflac - Command-line FLAC metadata editor
* Copyright (C) 2001-2009 Josh Coalson
* Copyright (C) 2011-2023 Xiph.Org Foundation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <errno.h>
#include <string.h>
#include "options.h"
#include "utils.h"
#include "FLAC/assert.h"
#include "share/grabbag.h" /* for grabbag__picture_parse_specification() etc */
#include "operations_shorthand.h"
static FLAC__bool import_pic_from(const char *filename, FLAC__StreamMetadata **picture, const char *specification, FLAC__bool *needs_write);
static FLAC__bool export_pic_to(const char *filename, const FLAC__StreamMetadata *picture, const char *pic_filename);
FLAC__bool do_shorthand_operation__picture(const char *filename, FLAC__Metadata_Chain *chain, const Operation *operation, FLAC__bool *needs_write)
{
FLAC__bool ok = true, has_type1 = false, has_type2 = false;
FLAC__StreamMetadata *picture = 0;
FLAC__Metadata_Iterator *iterator = FLAC__metadata_iterator_new();
if(0 == iterator)
die("out of memory allocating iterator");
FLAC__metadata_iterator_init(iterator, chain);
switch(operation->type) {
case OP__IMPORT_PICTURE_FROM:
ok = import_pic_from(filename, &picture, operation->argument.specification.value, needs_write);
if(ok) {
/* append PICTURE block */
while(FLAC__metadata_iterator_next(iterator))
;
if(!FLAC__metadata_iterator_insert_block_after(iterator, picture)) {
print_error_with_chain_status(chain, "%s: ERROR: adding new PICTURE block to metadata", filename);
FLAC__metadata_object_delete(picture);
ok = false;
}
}
if(ok) {
/* check global PICTURE constraints (max 1 block each of type=1 and type=2) */
while(FLAC__metadata_iterator_prev(iterator))
;
do {
FLAC__StreamMetadata *block = FLAC__metadata_iterator_get_block(iterator);
if(block->type == FLAC__METADATA_TYPE_PICTURE) {
if(block->data.picture.type == FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON_STANDARD) {
if(has_type1) {
print_error_with_chain_status(chain, "%s: ERROR: FLAC stream can only have one 32x32 standard icon (type=1) PICTURE block", filename);
ok = false;
}
has_type1 = true;
}
else if(block->data.picture.type == FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON) {
if(has_type2) {
print_error_with_chain_status(chain, "%s: ERROR: FLAC stream can only have one icon (type=2) PICTURE block", filename);
ok = false;
}
has_type2 = true;
}
}
} while(FLAC__metadata_iterator_next(iterator));
}
break;
case OP__EXPORT_PICTURE_TO:
{
const Argument_BlockNumber *a = operation->argument.export_picture_to.block_number_link;
int block_number = (a && a->num_entries > 0)? (int)a->entries[0] : -1;
unsigned i = 0;
do {
FLAC__StreamMetadata *block = FLAC__metadata_iterator_get_block(iterator);
if(block->type == FLAC__METADATA_TYPE_PICTURE && (block_number < 0 || i == (unsigned)block_number))
picture = block;
i++;
} while(FLAC__metadata_iterator_next(iterator) && 0 == picture);
if(0 == picture) {
if(block_number < 0)
flac_fprintf(stderr, "%s: ERROR: FLAC file has no PICTURE block\n", filename);
else
flac_fprintf(stderr, "%s: ERROR: FLAC file has no PICTURE block at block #%d\n", filename, block_number);
ok = false;
}
else
ok = export_pic_to(filename, picture, operation->argument.filename.value);
}
break;
default:
ok = false;
FLAC__ASSERT(0);
break;
};
FLAC__metadata_iterator_delete(iterator);
return ok;
}
/*
* local routines
*/
FLAC__bool import_pic_from(const char *filename, FLAC__StreamMetadata **picture, const char *specification, FLAC__bool *needs_write)
{
const char *error_message;
if(0 == specification || strlen(specification) == 0) {
flac_fprintf(stderr, "%s: ERROR: empty picture specification\n", filename);
return false;
}
*picture = grabbag__picture_parse_specification(specification, &error_message);
if(0 == *picture) {
flac_fprintf(stderr, "%s: ERROR: while parsing picture specification \"%s\": %s\n", filename, specification, error_message);
return false;
}
if(!FLAC__format_picture_is_legal(&(*picture)->data.picture, &error_message)) {
flac_fprintf(stderr, "%s: ERROR: new PICTURE block for \"%s\" is illegal: %s\n", filename, specification, error_message);
FLAC__metadata_object_delete(*picture);
*picture = 0;
return false;
}
*needs_write = true;
return true;
}
FLAC__bool export_pic_to(const char *filename, const FLAC__StreamMetadata *picture, const char *pic_filename)
{
FILE *f;
const FLAC__uint32 len = picture->data.picture.data_length;
if(0 == pic_filename || strlen(pic_filename) == 0) {
flac_fprintf(stderr, "%s: ERROR: empty export file name\n", filename);
return false;
}
if(0 == strcmp(pic_filename, "-"))
f = grabbag__file_get_binary_stdout();
else
f = flac_fopen(pic_filename, "wb");
if(0 == f) {
flac_fprintf(stderr, "%s: ERROR: can't open export file %s: %s\n", filename, pic_filename, strerror(errno));
return false;
}
if(fwrite(picture->data.picture.data, 1, len, f) != len) {
flac_fprintf(stderr, "%s: ERROR: writing PICTURE data to file\n", filename);
if(f != stdout)
fclose(f);
return false;
}
if(f != stdout)
fclose(f);
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
/* Delete output file when fuzzing */
if(f != stdout)
flac_unlink(pic_filename);
#endif
return true;
}
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