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110 lines
3.1 KiB
110 lines
3.1 KiB
/*****************************************************************************
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* udp.h: User Datagram Protocol (UDP)
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*****************************************************************************
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* Copyright (C) 2015 VideoLAN
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*
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* Authors: Benjamin Cohen <bencoh@notk.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject
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* to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*****************************************************************************/
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/*
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* Normative references:
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* - IETF RFC 768 User Datagram Protocol (August 1980)
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*/
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#ifndef __BITSTREAM_IETF_UDP_H__
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#define __BITSTREAM_IETF_UDP_H__
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/*
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* Reminder: UDP header
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0 7 8 15 16 23 24 31
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+--------+--------+--------+--------+
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| Source | Destination |
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| Port | Port |
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+--------+--------+--------+--------+
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| | |
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| Length | Checksum |
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+--------+--------+--------+--------+
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*/
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#define UDP_HEADER_SIZE 8
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static inline void udp_set_srcport(uint8_t *p_udp, uint16_t port)
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{
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p_udp[0] = (port & 0xff00) >> 8;
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p_udp[1] = (port & 0xff);
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}
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static inline uint16_t udp_get_srcport(const uint8_t *p_udp)
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{
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return (p_udp[0] << 8) | p_udp[1];
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}
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static inline void udp_set_dstport(uint8_t *p_udp, uint16_t port)
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{
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p_udp[2] = (port & 0xff00) >> 8;
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p_udp[3] = (port & 0xff);
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}
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static inline uint16_t udp_get_dstport(const uint8_t *p_udp)
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{
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return (p_udp[2] << 8) | p_udp[3];
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}
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static inline void udp_set_len(uint8_t *p_udp, uint16_t len)
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{
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p_udp[4] = (len & 0xff00) >> 8;
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p_udp[5] = (len & 0xff);
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}
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static inline uint16_t udp_get_len(const uint8_t *p_udp)
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{
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return (p_udp[4] << 8) | p_udp[5];
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}
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static inline void udp_set_cksum(uint8_t *p_udp, uint16_t cksum)
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{
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p_udp[6] = (cksum & 0xff00) >> 8;
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p_udp[7] = (cksum & 0xff);
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}
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static inline uint16_t udp_get_cksum(const uint8_t *p_udp)
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{
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return (p_udp[6] << 8) | p_udp[7];
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}
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static inline uint8_t *udp_payload(uint8_t *p_udp)
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{
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return p_udp + UDP_HEADER_SIZE;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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