/* metaflac - Command-line FLAC metadata editor

* Copyright (C) 2001-2009 Josh Coalson

* Copyright (C) 2011-2016 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);

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);

return true;

}