/usr/include/bitstream/ietf/udp.h is in libbitstream-dev 1.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* udp.h: User Datagram Protocol (UDP)
*****************************************************************************
* Copyright (C) 2015 VideoLAN
*
* Authors: Benjamin Cohen <bencoh@notk.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject
* to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*****************************************************************************/
/*
* Normative references:
* - IETF RFC 768 User Datagram Protocol (August 1980)
*/
#ifndef __BITSTREAM_IETF_UDP_H__
#define __BITSTREAM_IETF_UDP_H__
#include <stdint.h>
#ifdef __cplusplus
extern "C"
{
#endif
/*
* Reminder: UDP header
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+--------+--------+--------+--------+
| Source | Destination |
| Port | Port |
+--------+--------+--------+--------+
| | |
| Length | Checksum |
+--------+--------+--------+--------+
*/
#define UDP_HEADER_SIZE 8
static inline void udp_set_srcport(uint8_t *p_udp, uint16_t port)
{
p_udp[0] = (port & 0xff00) >> 8;
p_udp[1] = (port & 0xff);
}
static inline uint16_t udp_get_srcport(const uint8_t *p_udp)
{
return (p_udp[0] << 8) | p_udp[1];
}
static inline void udp_set_dstport(uint8_t *p_udp, uint16_t port)
{
p_udp[2] = (port & 0xff00) >> 8;
p_udp[3] = (port & 0xff);
}
static inline uint16_t udp_get_dstport(const uint8_t *p_udp)
{
return (p_udp[2] << 8) | p_udp[3];
}
static inline void udp_set_len(uint8_t *p_udp, uint16_t len)
{
p_udp[4] = (len & 0xff00) >> 8;
p_udp[5] = (len & 0xff);
}
static inline uint16_t udp_get_len(const uint8_t *p_udp)
{
return (p_udp[4] << 8) | p_udp[5];
}
static inline void udp_set_cksum(uint8_t *p_udp, uint16_t cksum)
{
p_udp[6] = (cksum & 0xff00) >> 8;
p_udp[7] = (cksum & 0xff);
}
static inline uint16_t udp_get_cksum(const uint8_t *p_udp)
{
return (p_udp[6] << 8) | p_udp[7];
}
static inline uint8_t *udp_payload(uint8_t *p_udp)
{
return p_udp + UDP_HEADER_SIZE;
}
#ifdef __cplusplus
}
#endif
#endif
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