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event2
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tag.h
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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_INCLUDED_ #define EVENT2_TAG_H_INCLUDED_ /** @file event2/tag.h Helper functions for reading and writing tagged data onto buffers. */ #include <event2/visibility.h> #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. */ EVENT2_EXPORT_SYMBOL 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. */ EVENT2_EXPORT_SYMBOL int evtag_unmarshal_header(struct evbuffer *evbuf, ev_uint32_t *ptag); EVENT2_EXPORT_SYMBOL void evtag_marshal(struct evbuffer *evbuf, ev_uint32_t tag, const void *data, ev_uint32_t len); EVENT2_EXPORT_SYMBOL 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 */ EVENT2_EXPORT_SYMBOL void evtag_encode_int(struct evbuffer *evbuf, ev_uint32_t number); EVENT2_EXPORT_SYMBOL void evtag_encode_int64(struct evbuffer *evbuf, ev_uint64_t number); EVENT2_EXPORT_SYMBOL void evtag_marshal_int(struct evbuffer *evbuf, ev_uint32_t tag, ev_uint32_t integer); EVENT2_EXPORT_SYMBOL void evtag_marshal_int64(struct evbuffer *evbuf, ev_uint32_t tag, ev_uint64_t integer); EVENT2_EXPORT_SYMBOL void evtag_marshal_string(struct evbuffer *buf, ev_uint32_t tag, const char *string); EVENT2_EXPORT_SYMBOL void evtag_marshal_timeval(struct evbuffer *evbuf, ev_uint32_t tag, struct timeval *tv); EVENT2_EXPORT_SYMBOL int evtag_unmarshal(struct evbuffer *src, ev_uint32_t *ptag, struct evbuffer *dst); EVENT2_EXPORT_SYMBOL int evtag_peek(struct evbuffer *evbuf, ev_uint32_t *ptag); EVENT2_EXPORT_SYMBOL int evtag_peek_length(struct evbuffer *evbuf, ev_uint32_t *plength); EVENT2_EXPORT_SYMBOL int evtag_payload_length(struct evbuffer *evbuf, ev_uint32_t *plength); EVENT2_EXPORT_SYMBOL int evtag_consume(struct evbuffer *evbuf); EVENT2_EXPORT_SYMBOL int evtag_unmarshal_int(struct evbuffer *evbuf, ev_uint32_t need_tag, ev_uint32_t *pinteger); EVENT2_EXPORT_SYMBOL int evtag_unmarshal_int64(struct evbuffer *evbuf, ev_uint32_t need_tag, ev_uint64_t *pinteger); EVENT2_EXPORT_SYMBOL int evtag_unmarshal_fixed(struct evbuffer *src, ev_uint32_t need_tag, void *data, size_t len); EVENT2_EXPORT_SYMBOL int evtag_unmarshal_string(struct evbuffer *evbuf, ev_uint32_t need_tag, char **pstring); EVENT2_EXPORT_SYMBOL int evtag_unmarshal_timeval(struct evbuffer *evbuf, ev_uint32_t need_tag, struct timeval *ptv); #ifdef __cplusplus } #endif #endif /* EVENT2_TAG_H_INCLUDED_ */