libevent: event2/tag.h Source File

libevent 2.1.13 Event notification library

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tag.h
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1/*
2 * Copyright (c) 2000-2007 Niels Provos <provos@citi.umich.edu>
3 * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27#ifndef EVENT2_TAG_H_INCLUDED_
28#define EVENT2_TAG_H_INCLUDED_
29
35
36#include <event2/visibility.h>
37
38#ifdef __cplusplus
39extern "C" {
40#endif
41
42#include <event2/event-config.h>
43#ifdef EVENT__HAVE_SYS_TYPES_H
44#include <sys/types.h>
45#endif
46#ifdef EVENT__HAVE_SYS_TIME_H
47#include <sys/time.h>
48#endif
49
50/* For int types. */
51#include <event2/util.h>
52
53struct evbuffer;
54
55/*
56 * Marshaling tagged data - We assume that all tags are inserted in their
57 * numeric order - so that unknown tags will always be higher than the
58 * known ones - and we can just ignore the end of an event buffer.
59 */
60
61EVENT2_EXPORT_SYMBOL
62void evtag_init(void);
63
73EVENT2_EXPORT_SYMBOL
74 int evtag_unmarshal_header(struct evbuffer *evbuf, ev_uint32_t *ptag);
75
76EVENT2_EXPORT_SYMBOL
77void evtag_marshal(struct evbuffer *evbuf, ev_uint32_t tag, const void *data,
78 ev_uint32_t len);
79EVENT2_EXPORT_SYMBOL
80void evtag_marshal_buffer(struct evbuffer *evbuf, ev_uint32_t tag,
81 struct evbuffer *data);
82
93EVENT2_EXPORT_SYMBOL
94 void evtag_encode_int(struct evbuffer *evbuf, ev_uint32_t number);
95EVENT2_EXPORT_SYMBOL
96void evtag_encode_int64(struct evbuffer *evbuf, ev_uint64_t number);
97
98EVENT2_EXPORT_SYMBOL
99void evtag_marshal_int(struct evbuffer *evbuf, ev_uint32_t tag,
100 ev_uint32_t integer);
101EVENT2_EXPORT_SYMBOL
102void evtag_marshal_int64(struct evbuffer *evbuf, ev_uint32_t tag,
103 ev_uint64_t integer);
104
105EVENT2_EXPORT_SYMBOL
106void evtag_marshal_string(struct evbuffer *buf, ev_uint32_t tag,
107 const char *string);
108
109EVENT2_EXPORT_SYMBOL
110void evtag_marshal_timeval(struct evbuffer *evbuf, ev_uint32_t tag,
111 struct timeval *tv);
112
113EVENT2_EXPORT_SYMBOL
114int evtag_unmarshal(struct evbuffer *src, ev_uint32_t *ptag,
115 struct evbuffer *dst);
116EVENT2_EXPORT_SYMBOL
117int evtag_peek(struct evbuffer *evbuf, ev_uint32_t *ptag);
118EVENT2_EXPORT_SYMBOL
119int evtag_peek_length(struct evbuffer *evbuf, ev_uint32_t *plength);
120EVENT2_EXPORT_SYMBOL
121int evtag_payload_length(struct evbuffer *evbuf, ev_uint32_t *plength);
122EVENT2_EXPORT_SYMBOL
123int evtag_consume(struct evbuffer *evbuf);
124
125EVENT2_EXPORT_SYMBOL
126int evtag_unmarshal_int(struct evbuffer *evbuf, ev_uint32_t need_tag,
127 ev_uint32_t *pinteger);
128EVENT2_EXPORT_SYMBOL
129int evtag_unmarshal_int64(struct evbuffer *evbuf, ev_uint32_t need_tag,
130 ev_uint64_t *pinteger);
131
132EVENT2_EXPORT_SYMBOL
133int evtag_unmarshal_fixed(struct evbuffer *src, ev_uint32_t need_tag,
134 void *data, size_t len);
135
136EVENT2_EXPORT_SYMBOL
137int evtag_unmarshal_string(struct evbuffer *evbuf, ev_uint32_t need_tag,
138 char **pstring);
139
140EVENT2_EXPORT_SYMBOL
141int evtag_unmarshal_timeval(struct evbuffer *evbuf, ev_uint32_t need_tag,
142 struct timeval *ptv);
143
144#ifdef __cplusplus
145}
146#endif
147
148#endif /* EVENT2_TAG_H_INCLUDED_ */
evbuffer
An evbuffer is an opaque data type for efficiently buffering data to be sent or received on the netwo...
Definition buffer.h:99
evtag_encode_int
EVENT2_EXPORT_SYMBOL void evtag_encode_int(struct evbuffer *evbuf, ev_uint32_t number)
Encode an integer and store it in an evbuffer.
evtag_unmarshal_header
EVENT2_EXPORT_SYMBOL int evtag_unmarshal_header(struct evbuffer *evbuf, ev_uint32_t *ptag)
Unmarshals the header and returns the length of the payload.
util.h
Common convenience functions for cross-platform portability and related socket manipulations.