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kc3-lang/libevent/bufferevent-internal.h

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  • Author : Niels Provos
    Date : 2008-04-30 00:09:16
    Hash : 682adc44
    Message : support input/output filters for bufferevents svn:r748

  • bufferevent-internal.h 
  • /*
 * Copyright (c) 2008 Niels Provos <provos@citi.umich.edu>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef _BUFFEREVENT_INTERNAL_H_
#define _BUFFEREVENT_INTERNAL_H_

#ifdef __cplusplus
extern "C" {
#endif

#include "config.h"
#include "evutil.h"

struct bufferevent_filter {
	/** allows chaining of filters */
	TAILQ_ENTRY(bufferevent_filter) (next);

	/** used for intermediary state either on the input or output path */
	struct evbuffer *buffer;

	/** initializes the context provided to process */
	void (*init_context)(void *);

	/** frees any context related to ctx */
	void (*free_context)(void *);

	enum bufferevent_filter_result (*process)(
		struct evbuffer *src, struct evbuffer *dst,
		enum bufferevent_filter_state flags, void *ctx);

	void *ctx;
};

#ifdef __cplusplus
}
#endif

#endif /* _BUFFEREVENT_INTERNAL_H_ */