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icecast-common/httpp/encoding.h
2018-10-12 11:27:17 +00:00

90 lines
3.4 KiB
C

/* encoding.h
**
** http transfer encoding library
** See RFC2616 section 3.6 for more details.
**
** Copyright (C) 2015-2018 Philipp "ph3-der-loewe" Schafft <lion@lion.leolix.org>
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Library General Public
** License as published by the Free Software Foundation; either
** version 2 of the License, or (at your option) any later version.
**
** This library 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
** Library General Public License for more details.
**
** You should have received a copy of the GNU Library General Public
** License along with this library; if not, write to the
** Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
** Boston, MA 02110-1301, USA.
**
*/
#ifndef _LIBIGLOO__ENCODING_H_
#define _LIBIGLOO__ENCODING_H_
#include <sys/types.h>
/* known encodings */
#define igloo_HTTPP_ENCODING_IDENTITY "identity" /* RFC2616 */
#define igloo_HTTPP_ENCODING_CHUNKED "chunked" /* RFC2616 */
#define igloo_HTTPP_ENCODING_GZIP "gzip" /* RFC1952 */
#define igloo_HTTPP_ENCODING_COMPRESS "compress" /* ??? */
#define igloo_HTTPP_ENCODING_DEFLATE "deflate" /* RFC1950, RFC1951 */
typedef struct igloo_httpp_encoding_tag igloo_httpp_encoding_t;
typedef struct httpp_meta_tag httpp_meta_t;
struct httpp_meta_tag {
char *key;
void *value;
size_t value_len;
httpp_meta_t *next;
};
/* meta data functions */
/* meta data is to be used in a encoding-specific way */
httpp_meta_t *igloo_httpp_encoding_meta_new(const char *key, const char *value);
int igloo_httpp_encoding_meta_free(httpp_meta_t *self);
int igloo_httpp_encoding_meta_append(httpp_meta_t **dst, httpp_meta_t *next);
/* General setup */
igloo_httpp_encoding_t *igloo_httpp_encoding_new(const char *encoding);
int igloo_httpp_encoding_addref(igloo_httpp_encoding_t *self);
int igloo_httpp_encoding_release(igloo_httpp_encoding_t *self);
/* Read data from backend.
* if cb is NULL this will read from the internal buffer.
*/
ssize_t igloo_httpp_encoding_read(igloo_httpp_encoding_t *self, void *buf, size_t len, ssize_t (*cb)(void*, void*, size_t), void *userdata);
/* Check if EOF is reached.
* If cb is not NULL this also considers backend state.
*/
int igloo_httpp_encoding_eof(igloo_httpp_encoding_t *self, int (*cb)(void*), void *userdata);
/* Read any meta data that is in buffer.
* After a call to this function the meta data is released from the
* encoding object and the caller is responsible to free it.
*/
httpp_meta_t *igloo_httpp_encoding_get_meta(igloo_httpp_encoding_t *self);
/* Write data to backend.
* If buf is NULL this will flush buffers.
* Depending on encoding flushing buffers may not be safe if not
* at end of stream.
*/
ssize_t igloo_httpp_encoding_write(igloo_httpp_encoding_t *self, const void *buf, size_t len, ssize_t (*cb)(void*, const void*, size_t), void *userdata);
/* Check if we have something to flush. */
ssize_t igloo_httpp_encoding_pending(igloo_httpp_encoding_t *self);
/* Attach meta data to the stream.
* this is to be written out as soon as the encoding supports.
*/
int igloo_httpp_encoding_append_meta(igloo_httpp_encoding_t *self, httpp_meta_t *meta);
#endif