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/* flac - Command-line FLAC encoder/decoder
* Copyright (C) 2002 Josh Coalson
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include "FLAC/assert.h"
#include "FLAC/metadata.h"
#include "share/utf8.h"
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
* This struct and the following 4 static functions are copied from
* ../metaflac/main.c. Maybe someday there will be a convenience
* library for Vorbis comment parsing.
*/
typedef struct {
char *field; /* the whole field as passed on the command line, i.e. "NAME=VALUE" */
char *field_name;
/* according to the vorbis spec, field values can contain \0 so simple C strings are not enough here */
unsigned field_value_length;
char *field_value;
} Argument_VcField;
static void die(const char *message)
{
FLAC__ASSERT(0 != message);
fprintf(stderr, "ERROR: %s\n", message);
exit(1);
}
static char *local_strdup(const char *source)
{
char *ret;
FLAC__ASSERT(0 != source);
if(0 == (ret = strdup(source)))
die("out of memory during strdup()");
return ret;
}
static FLAC__bool parse_vorbis_comment_field(const char *field_ref, char **field, char **name, char **value, unsigned *length, const char **violation)
{
static const char * const violations[] = {
"field name contains invalid character",
"field contains no '=' character"
};
char *p, *q, *s;
if(0 != field)
*field = local_strdup(field_ref);
s = local_strdup(field_ref);
if(0 == (p = strchr(s, '='))) {
free(s);
*violation = violations[1];
return false;
}
*p++ = '\0';
for(q = s; *q; q++) {
if(*q < 0x20 || *q > 0x7d || *q == 0x3d) {
free(s);
*violation = violations[0];
return false;
}
}
*name = local_strdup(s);
*value = local_strdup(p);
*length = strlen(p);
free(s);
return true;
}
/* slight modification: no 'filename' arg, and errors are passed back in 'violation' instead of printed to stderr */
static FLAC__bool set_vc_field(FLAC__StreamMetadata *block, const Argument_VcField *field, FLAC__bool *needs_write, FLAC__bool raw, const char **violation)
{
FLAC__StreamMetadata_VorbisComment_Entry entry;
char *converted;
FLAC__bool needs_free = false;
FLAC__ASSERT(0 != block);
FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
FLAC__ASSERT(0 != field);
FLAC__ASSERT(0 != needs_write);
if(raw) {
entry.entry = field->field;
}
else if(utf8_encode(field->field, &converted) >= 0) {
entry.entry = converted;
needs_free = true;
}
else {
*violation = "couldn't convert comment to UTF-8";
return false;
}
entry.length = strlen(entry.entry);
if(!FLAC__metadata_object_vorbiscomment_insert_comment(block, block->data.vorbis_comment.num_comments, entry, /*copy=*/true)) {
if(needs_free)
free(converted);
*violation = "memory allocation failure";
return false;
}
else {
*needs_write = true;
if(needs_free)
free(converted);
return true;
}
}
/*
* The rest of the code is novel
*/
static void free_field(Argument_VcField *obj)
{
if(0 != obj->field)
free(obj->field);
if(0 != obj->field_name)
free(obj->field_name);
if(0 != obj->field_value)
free(obj->field_value);
}
FLAC__bool flac__vorbiscomment_add(FLAC__StreamMetadata *block, const char *comment, const char **violation)
{
Argument_VcField parsed;
FLAC__bool dummy;
FLAC__ASSERT(0 != block);
FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
FLAC__ASSERT(0 != comment);
memset(&parsed, 0, sizeof(parsed));
if(!parse_vorbis_comment_field(comment, &(parsed.field), &(parsed.field_name), &(parsed.field_value), &(parsed.field_value_length), violation)) {
free_field(&parsed);
return false;
}
if(!set_vc_field(block, &parsed, &dummy, /*raw=*/false, violation)) {
free_field(&parsed);
return false;
}
else {
free_field(&parsed);
return true;
}
}
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