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/*
* 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
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