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/*
* Copyright (c) 2000-2007 Niels Provos <provos@citi.umich.edu>
* Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
*
* 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 _EVENT2_TAG_H_
#define _EVENT2_TAG_H_
/** @file event2/tag.h
Helper functions for reading and writing tagged data onto buffers.
*/
#ifdef __cplusplus
extern "C" {
#endif
#include <event2/event-config.h>
#ifdef _EVENT_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef _EVENT_HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
/* For int types. */
#include <event2/util.h>
struct evbuffer;
/*
* Marshaling tagged data - We assume that all tags are inserted in their
* numeric order - so that unknown tags will always be higher than the
* known ones - and we can just ignore the end of an event buffer.
*/
void evtag_init(void);
/**
Unmarshals the header and returns the length of the payload
@param evbuf the buffer from which to unmarshal data
@param ptag a pointer in which the tag id is being stored
@returns -1 on failure or the number of bytes in the remaining payload.
*/
int evtag_unmarshal_header(struct evbuffer *evbuf, ev_uint32_t *ptag);
void evtag_marshal(struct evbuffer *evbuf, ev_uint32_t tag, const void *data,
ev_uint32_t len);
void evtag_marshal_buffer(struct evbuffer *evbuf, ev_uint32_t tag,
struct evbuffer *data);
/**
Encode an integer and store it in an evbuffer.
We encode integers by nybbles; the first nibble contains the number
of significant nibbles - 1; this allows us to encode up to 64-bit
integers. This function is byte-order independent.
@param evbuf evbuffer to store the encoded number
@param number a 32-bit integer
*/
void evtag_encode_int(struct evbuffer *evbuf, ev_uint32_t number);
void evtag_encode_int64(struct evbuffer *evbuf, ev_uint64_t number);
void evtag_marshal_int(struct evbuffer *evbuf, ev_uint32_t tag,
ev_uint32_t integer);
void evtag_marshal_int64(struct evbuffer *evbuf, ev_uint32_t tag,
ev_uint64_t integer);
void evtag_marshal_string(struct evbuffer *buf, ev_uint32_t tag,
const char *string);
void evtag_marshal_timeval(struct evbuffer *evbuf, ev_uint32_t tag,
struct timeval *tv);
int evtag_unmarshal(struct evbuffer *src, ev_uint32_t *ptag,
struct evbuffer *dst);
int evtag_peek(struct evbuffer *evbuf, ev_uint32_t *ptag);
int evtag_peek_length(struct evbuffer *evbuf, ev_uint32_t *plength);
int evtag_payload_length(struct evbuffer *evbuf, ev_uint32_t *plength);
int evtag_consume(struct evbuffer *evbuf);
int evtag_unmarshal_int(struct evbuffer *evbuf, ev_uint32_t need_tag,
ev_uint32_t *pinteger);
int evtag_unmarshal_int64(struct evbuffer *evbuf, ev_uint32_t need_tag,
ev_uint64_t *pinteger);
int evtag_unmarshal_fixed(struct evbuffer *src, ev_uint32_t need_tag,
void *data, size_t len);
int evtag_unmarshal_string(struct evbuffer *evbuf, ev_uint32_t need_tag,
char **pstring);
int evtag_unmarshal_timeval(struct evbuffer *evbuf, ev_uint32_t need_tag,
struct timeval *ptv);
#ifdef __cplusplus
}
#endif
#endif /* _EVENT2_TAG_H_ */
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