/* * Copyright (C) 2003-2010 The Music Player Daemon Project * http://www.musicpd.org * * 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. */ #ifndef ICY_METADATA_H #define ICY_METADATA_H #include <stdbool.h> #include <stddef.h> struct icy_metadata { size_t data_size, data_rest; size_t meta_size, meta_position; char *meta_data; struct tag *tag; }; /** * Initialize a disabled icy_metadata object. */ static inline void icy_clear(struct icy_metadata *im) { im->data_size = 0; } /** * Initialize an enabled icy_metadata object with the specified * data_size (from the icy-metaint HTTP response header). */ static inline void icy_start(struct icy_metadata *im, size_t data_size) { im->data_size = im->data_rest = data_size; im->meta_size = 0; im->tag = NULL; } /** * Resets the icy_metadata. Call this after rewinding the stream. */ void icy_reset(struct icy_metadata *im); void icy_deinit(struct icy_metadata *im); /** * Checks whether the icy_metadata object is enabled. */ static inline bool icy_defined(const struct icy_metadata *im) { return im->data_size > 0; } /** * Evaluates data. Returns the number of bytes of normal data which * can be read by the caller, but not more than "length". If the * return value is smaller than "length", the caller should invoke * icy_meta(). */ size_t icy_data(struct icy_metadata *im, size_t length); /** * Reads metadata from the stream. Returns the number of bytes * consumed. If the return value is smaller than "length", the caller * should invoke icy_data(). */ size_t icy_meta(struct icy_metadata *im, const void *data, size_t length); static inline struct tag * icy_tag(struct icy_metadata *im) { struct tag *tag = im->tag; im->tag = NULL; return tag; } #endif