metadata_object.c

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		free(vc->comments[comment_num].entry);

	/* move all comments > comment_num backward one space */
	memmove(&vc->comments[comment_num], &vc->comments[comment_num+1], sizeof(FLAC__StreamMetadata_VorbisComment_Entry)*(vc->num_comments-comment_num-1));
	vc->comments[vc->num_comments-1].length = 0;
	vc->comments[vc->num_comments-1].entry = 0;

	return FLAC__metadata_object_vorbiscomment_resize_comments(object, vc->num_comments-1);
}

FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(FLAC__StreamMetadata_VorbisComment_Entry *entry, const char *field_name, const char *field_value)
{
	FLAC__ASSERT(0 != entry);
	FLAC__ASSERT(0 != field_name);
	FLAC__ASSERT(0 != field_value);

	if(!FLAC__format_vorbiscomment_entry_name_is_legal(field_name))
		return false;
	if(!FLAC__format_vorbiscomment_entry_value_is_legal(field_value, (unsigned)(-1)))
		return false;

	{
		const size_t nn = strlen(field_name);
		const size_t nv = strlen(field_value);
		entry->length = nn + 1 /*=*/ + nv;
		if(0 == (entry->entry = (FLAC__byte*)malloc(entry->length+1)))
			return false;
		memcpy(entry->entry, field_name, nn);
		entry->entry[nn] = '=';
		memcpy(entry->entry+nn+1, field_value, nv);
		entry->entry[entry->length] = '\0';
	}
	
	return true;
}

FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_to_name_value_pair(const FLAC__StreamMetadata_VorbisComment_Entry entry, char **field_name, char **field_value)
{
	FLAC__ASSERT(0 != entry.entry && entry.length > 0);
	FLAC__ASSERT(0 != field_name);
	FLAC__ASSERT(0 != field_value);

	if(!FLAC__format_vorbiscomment_entry_is_legal(entry.entry, entry.length))
		return false;

	{
		const FLAC__byte *eq = (FLAC__byte*)memchr(entry.entry, '=', entry.length);
		const size_t nn = eq-entry.entry;
		const size_t nv = entry.length-nn-1; /* -1 for the '=' */
		FLAC__ASSERT(0 != eq);
		if(0 == eq)
			return false; /* double protection */
		if(0 == (*field_name = (char*)malloc(nn+1)))
			return false;
		if(0 == (*field_value = (char*)malloc(nv+1))) {
			free(*field_name);
			return false;
		}
		memcpy(*field_name, entry.entry, nn);
		memcpy(*field_value, entry.entry+nn+1, nv);
		(*field_name)[nn] = '\0';
		(*field_value)[nv] = '\0';
	}

	return true;
}

FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_matches(const FLAC__StreamMetadata_VorbisComment_Entry entry, const char *field_name, unsigned field_name_length)
{
	FLAC__ASSERT(0 != entry.entry && entry.length > 0);
	{
		const FLAC__byte *eq = (FLAC__byte*)memchr(entry.entry, '=', entry.length);
#if defined _MSC_VER || defined __MINGW32__
#define FLAC__STRNCASECMP _strnicmp
#elif defined __palmos__
#define FLAC__STRNCASECMP tcsnicmp
#else
#define FLAC__STRNCASECMP strncasecmp
#endif
		return (0 != eq && (unsigned)(eq-entry.entry) == field_name_length && 0 == FLAC__STRNCASECMP(field_name, (const char *)entry.entry, field_name_length));
#undef FLAC__STRNCASECMP
	}
}

FLAC_API int FLAC__metadata_object_vorbiscomment_find_entry_from(const FLAC__StreamMetadata *object, unsigned offset, const char *field_name)
{
	FLAC__ASSERT(0 != field_name);

	return vorbiscomment_find_entry_from_(object, offset, field_name, strlen(field_name));
}

FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entry_matching(FLAC__StreamMetadata *object, const char *field_name)
{
	const unsigned field_name_length = strlen(field_name);
	unsigned i;

	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);

	for(i = 0; i < object->data.vorbis_comment.num_comments; i++) {
		if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments[i], field_name, field_name_length)) {
			if(!FLAC__metadata_object_vorbiscomment_delete_comment(object, i))
				return -1;
			else
				return 1;
		}
	}

	return 0;
}

FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entries_matching(FLAC__StreamMetadata *object, const char *field_name)
{
	FLAC__bool ok = true;
	unsigned matching = 0;
	const unsigned field_name_length = strlen(field_name);
	int i;

	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);

	/* must delete from end to start otherwise it will interfere with our iteration */
	for(i = (int)object->data.vorbis_comment.num_comments - 1; ok && i >= 0; i--) {
		if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments[i], field_name, field_name_length)) {
			matching++;
			ok &= FLAC__metadata_object_vorbiscomment_delete_comment(object, (unsigned)i);
		}
	}

	return ok? (int)matching : -1;
}

FLAC_API FLAC__StreamMetadata_CueSheet_Track *FLAC__metadata_object_cuesheet_track_new()
{
	return (FLAC__StreamMetadata_CueSheet_Track*)calloc(1, sizeof(FLAC__StreamMetadata_CueSheet_Track));
}

FLAC_API FLAC__StreamMetadata_CueSheet_Track *FLAC__metadata_object_cuesheet_track_clone(const FLAC__StreamMetadata_CueSheet_Track *object)
{
	FLAC__StreamMetadata_CueSheet_Track *to;

	FLAC__ASSERT(0 != object);

	if(0 != (to = FLAC__metadata_object_cuesheet_track_new())) {
		if(!copy_track_(to, object)) {
			FLAC__metadata_object_cuesheet_track_delete(to);
			return 0;
		}
	}

	return to;
}

void FLAC__metadata_object_cuesheet_track_delete_data(FLAC__StreamMetadata_CueSheet_Track *object)
{
	FLAC__ASSERT(0 != object);

	if(0 != object->indices) {
		FLAC__ASSERT(object->num_indices > 0);
		free(object->indices);
	}
}

FLAC_API void FLAC__metadata_object_cuesheet_track_delete(FLAC__StreamMetadata_CueSheet_Track *object)
{
	FLAC__metadata_object_cuesheet_track_delete_data(object);
	free(object);
}

FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_resize_indices(FLAC__StreamMetadata *object, unsigned track_num, unsigned new_num_indices)
{
	FLAC__StreamMetadata_CueSheet_Track *track;
	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
	FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);

	track = &object->data.cue_sheet.tracks[track_num];

	if(0 == track->indices) {
		FLAC__ASSERT(track->num_indices == 0);
		if(0 == new_num_indices)
			return true;
		else if(0 == (track->indices = cuesheet_track_index_array_new_(new_num_indices)))
			return false;
	}
	else {
		const unsigned old_size = track->num_indices * sizeof(FLAC__StreamMetadata_CueSheet_Index);
		const unsigned new_size = new_num_indices * sizeof(FLAC__StreamMetadata_CueSheet_Index);

		FLAC__ASSERT(track->num_indices > 0);

		if(new_size == 0) {
			free(track->indices);
			track->indices = 0;
		}
		else if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)realloc(track->indices, new_size)))
			return false;

		/* if growing, zero all the lengths/pointers of new elements */
		if(new_size > old_size)
			memset(track->indices + track->num_indices, 0, new_size - old_size);
	}

	track->num_indices = new_num_indices;

	cuesheet_calculate_length_(object);
	return true;
}

FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_insert_index(FLAC__StreamMetadata *object, unsigned track_num, unsigned index_num, FLAC__StreamMetadata_CueSheet_Index index)
{
	FLAC__StreamMetadata_CueSheet_Track *track;

	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
	FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
	FLAC__ASSERT(index_num <= object->data.cue_sheet.tracks[track_num].num_indices);

	track = &object->data.cue_sheet.tracks[track_num];

	if(!FLAC__metadata_object_cuesheet_track_resize_indices(object, track_num, track->num_indices+1))
		return false;

	/* move all indices >= index_num forward one space */
	memmove(&track->indices[index_num+1], &track->indices[index_num], sizeof(FLAC__StreamMetadata_CueSheet_Index)*(track->num_indices-1-index_num));

	track->indices[index_num] = index;
	cuesheet_calculate_length_(object);
	return true;
}

FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_insert_blank_index(FLAC__StreamMetadata *object, unsigned track_num, unsigned index_num)
{
	FLAC__StreamMetadata_CueSheet_Index index;
	memset(&index, 0, sizeof(index));
	return FLAC__metadata_object_cuesheet_track_insert_index(object, track_num, index_num, index);
}

FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_delete_index(FLAC__StreamMetadata *object, unsigned track_num, unsigned index_num)
{
	FLAC__StreamMetadata_CueSheet_Track *track;

	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
	FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
	FLAC__ASSERT(index_num < object->data.cue_sheet.tracks[track_num].num_indices);

	track = &object->data.cue_sheet.tracks[track_num];

	/* move all indices > index_num backward one space */
	memmove(&track->indices[index_num], &track->indices[index_num+1], sizeof(FLAC__StreamMetadata_CueSheet_Index)*(track->num_indices-index_num-1));

	FLAC__metadata_object_cuesheet_track_resize_indices(object, track_num, track->num_indices-1);
	cuesheet_calculate_length_(object);
	return true;
}

FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_resize_tracks(FLAC__StreamMetadata *object, unsigned new_num_tracks)
{
	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);

	if(0 == object->data.cue_sheet.tracks) {
		FLAC__ASSERT(object->data.cue_sheet.num_tracks == 0);
		if(0 == new_num_tracks)
			return true;
		else if(0 == (object->data.cue_sheet.tracks = cuesheet_track_array_new_(new_num_tracks)))
			return false;
	}
	else {
		const unsigned old_size = object->data.cue_sheet.num_tracks * sizeof(FLAC__StreamMetadata_CueSheet_Track);
		const unsigned new_size = new_num_tracks * sizeof(FLAC__StreamMetadata_CueSheet_Track);

		FLAC__ASSERT(object->data.cue_sheet.num_tracks > 0);

		/* if shrinking, free the truncated entries */
		if(new_num_tracks < object->data.cue_sheet.num_tracks) {
			unsigned i;
			for(i = new_num_tracks; i < object->data.cue_sheet.num_tracks; i++)
				if(0 != object->data.cue_sheet.tracks[i].indices)
					free(object->data.cue_sheet.tracks[i].indices);
		}

		if(new_size == 0) {
			free(object->data.cue_sheet.tracks);
			object->data.cue_sheet.tracks = 0;
		}
		else if(0 == (object->data.cue_sheet.tracks = (FLAC__StreamMetadata_CueSheet_Track*)realloc(object->data.cue_sheet.tracks, new_size)))
			return false;

		/* if growing, zero all the lengths/pointers of new elements */
		if(new_size > old_size)
			memset(object->data.cue_sheet.tracks + object->data.cue_sheet.num_tracks, 0, new_size - old_size);
	}

	object->data.cue_sheet.num_tracks = new_num_tracks;

	cuesheet_calculate_length_(object);
	return true;
}

FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_set_track(FLAC__StreamMetadata *object, unsigned track_num, FLAC__StreamMetadata_CueSheet_Track *track, FLAC__bool copy)
{
	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);

	return cuesheet_set_track_(object, object->data.cue_sheet.tracks + track_num, track, copy);
}

FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_insert_track(FLAC__StreamMetadata *object, unsigned track_num, FLAC__StreamMetadata_CueSheet_Track *track, FLAC__bool copy)
{
	FLAC__StreamMetadata_CueSheet *cs;

	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
	FLAC__ASSERT(track_num <= object->data.cue_sheet.num_tracks);

	cs = &object->data.cue_sheet;

	if(!FLAC__metadata_object_cuesheet_resize_tracks(object, cs->num_tracks+1))
		return false;

	/* move all tracks >= track_num forward one space */
	memmove(&cs->tracks[track_num+1], &cs->tracks[track_num], sizeof(FLAC__StreamMetadata_CueSheet_Track)*(cs->num_tracks-1-track_num));
	cs->tracks[track_num].num_indices = 0;
	cs->tracks[track_num].indices = 0;

	return FLAC__metadata_object_cuesheet_set_track(object, track_num, track, copy);
}

FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_insert_blank_track(FLAC__StreamMetadata *object, unsigned track_num)
{
	FLAC__StreamMetadata_CueSheet_Track track;
	memset(&track, 0, sizeof(track));
	return FLAC__metadata_object_cuesheet_insert_track(object, track_num, &track, /*copy=*/false);
}

FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_delete_track(FLAC__StreamMetadata *object, unsigned track_num)
{
	FLAC__StreamMetadata_CueSheet *cs;

	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
	FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);

	cs = &object->data.cue_sheet;

	/* free the track at track_num */
	if(0 != cs->tracks[track_num].indices)
		free(cs->tracks[track_num].indices);

	/* move all tracks > track_num backward one space */
	memmove(&cs->tracks[track_num], &cs->tracks[track_num+1], sizeof(FLAC__StreamMetadata_CueSheet_Track)*(cs->num_tracks-track_num-1));
	cs->tracks[cs->num_tracks-1].num_indices = 0;
	cs->tracks[cs->num_tracks-1].indices = 0;

	return FLAC__metadata_object_cuesheet_resize_tracks(object, cs->num_tracks-1);
}

FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_is_legal(const FLAC__StreamMetadata *object, FLAC__bool check_cd_da_subset, const char **violation)
{
	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);

	return FLAC__format_cuesheet_is_legal(&object->data.cue_sheet, check_cd_da_subset, violation);
}