kc3-lang/libevent/include/event2/tag.h

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• Hash : 4545fa9b
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  Date : 2014-02-19T06:31:27
  

  Add option to build shared library
  

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• include/event2/tag.h

• /*
   * 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_ */
  

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