Michael Spencer / Mbed 2 deprecated LaOS

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Dependencies:   mbed

NetServices/lwip/core/def.c@1:f5ac63519541, 2014-03-05 (annotated)

Committer:
Michael J. Spencer
Date:
Wed Mar 05 06:14:02 2014 -0800
Revision:
1:f5ac63519541
Initial commit.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Michael J. Spencer 1:f5ac63519541 1 /**
Michael J. Spencer 1:f5ac63519541 2 * @file
Michael J. Spencer 1:f5ac63519541 3 * Common functions used throughout the stack.
Michael J. Spencer 1:f5ac63519541 4 *
Michael J. Spencer 1:f5ac63519541 5 */
Michael J. Spencer 1:f5ac63519541 6
Michael J. Spencer 1:f5ac63519541 7 /*
Michael J. Spencer 1:f5ac63519541 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
Michael J. Spencer 1:f5ac63519541 9 * All rights reserved.
Michael J. Spencer 1:f5ac63519541 10 *
Michael J. Spencer 1:f5ac63519541 11 * Redistribution and use in source and binary forms, with or without modification,
Michael J. Spencer 1:f5ac63519541 12 * are permitted provided that the following conditions are met:
Michael J. Spencer 1:f5ac63519541 13 *
Michael J. Spencer 1:f5ac63519541 14 * 1. Redistributions of source code must retain the above copyright notice,
Michael J. Spencer 1:f5ac63519541 15 * this list of conditions and the following disclaimer.
Michael J. Spencer 1:f5ac63519541 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
Michael J. Spencer 1:f5ac63519541 17 * this list of conditions and the following disclaimer in the documentation
Michael J. Spencer 1:f5ac63519541 18 * and/or other materials provided with the distribution.
Michael J. Spencer 1:f5ac63519541 19 * 3. The name of the author may not be used to endorse or promote products
Michael J. Spencer 1:f5ac63519541 20 * derived from this software without specific prior written permission.
Michael J. Spencer 1:f5ac63519541 21 *
Michael J. Spencer 1:f5ac63519541 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
Michael J. Spencer 1:f5ac63519541 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
Michael J. Spencer 1:f5ac63519541 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
Michael J. Spencer 1:f5ac63519541 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
Michael J. Spencer 1:f5ac63519541 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
Michael J. Spencer 1:f5ac63519541 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
Michael J. Spencer 1:f5ac63519541 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Michael J. Spencer 1:f5ac63519541 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
Michael J. Spencer 1:f5ac63519541 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
Michael J. Spencer 1:f5ac63519541 31 * OF SUCH DAMAGE.
Michael J. Spencer 1:f5ac63519541 32 *
Michael J. Spencer 1:f5ac63519541 33 * This file is part of the lwIP TCP/IP stack.
Michael J. Spencer 1:f5ac63519541 34 *
Michael J. Spencer 1:f5ac63519541 35 * Author: Simon Goldschmidt
Michael J. Spencer 1:f5ac63519541 36 *
Michael J. Spencer 1:f5ac63519541 37 */
Michael J. Spencer 1:f5ac63519541 38
Michael J. Spencer 1:f5ac63519541 39 #include "lwip/opt.h"
Michael J. Spencer 1:f5ac63519541 40 #include "lwip/def.h"
Michael J. Spencer 1:f5ac63519541 41
Michael J. Spencer 1:f5ac63519541 42 /**
Michael J. Spencer 1:f5ac63519541 43 * These are reference implementations of the byte swapping functions.
Michael J. Spencer 1:f5ac63519541 44 * Again with the aim of being simple, correct and fully portable.
Michael J. Spencer 1:f5ac63519541 45 * Byte swapping is the second thing you would want to optimize. You will
Michael J. Spencer 1:f5ac63519541 46 * need to port it to your architecture and in your cc.h:
Michael J. Spencer 1:f5ac63519541 47 *
Michael J. Spencer 1:f5ac63519541 48 * #define LWIP_PLATFORM_BYTESWAP 1
Michael J. Spencer 1:f5ac63519541 49 * #define LWIP_PLATFORM_HTONS(x) <your_htons>
Michael J. Spencer 1:f5ac63519541 50 * #define LWIP_PLATFORM_HTONL(x) <your_htonl>
Michael J. Spencer 1:f5ac63519541 51 *
Michael J. Spencer 1:f5ac63519541 52 * Note ntohs() and ntohl() are merely references to the htonx counterparts.
Michael J. Spencer 1:f5ac63519541 53 */
Michael J. Spencer 1:f5ac63519541 54
Michael J. Spencer 1:f5ac63519541 55 #if (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN)
Michael J. Spencer 1:f5ac63519541 56
Michael J. Spencer 1:f5ac63519541 57 /**
Michael J. Spencer 1:f5ac63519541 58 * Convert an u16_t from host- to network byte order.
Michael J. Spencer 1:f5ac63519541 59 *
Michael J. Spencer 1:f5ac63519541 60 * @param n u16_t in host byte order
Michael J. Spencer 1:f5ac63519541 61 * @return n in network byte order
Michael J. Spencer 1:f5ac63519541 62 */
Michael J. Spencer 1:f5ac63519541 63 u16_t
Michael J. Spencer 1:f5ac63519541 64 lwip_htons(u16_t n)
Michael J. Spencer 1:f5ac63519541 65 {
Michael J. Spencer 1:f5ac63519541 66 return ((n & 0xff) << 8) | ((n & 0xff00) >> 8);
Michael J. Spencer 1:f5ac63519541 67 }
Michael J. Spencer 1:f5ac63519541 68
Michael J. Spencer 1:f5ac63519541 69 /**
Michael J. Spencer 1:f5ac63519541 70 * Convert an u16_t from network- to host byte order.
Michael J. Spencer 1:f5ac63519541 71 *
Michael J. Spencer 1:f5ac63519541 72 * @param n u16_t in network byte order
Michael J. Spencer 1:f5ac63519541 73 * @return n in host byte order
Michael J. Spencer 1:f5ac63519541 74 */
Michael J. Spencer 1:f5ac63519541 75 u16_t
Michael J. Spencer 1:f5ac63519541 76 lwip_ntohs(u16_t n)
Michael J. Spencer 1:f5ac63519541 77 {
Michael J. Spencer 1:f5ac63519541 78 return lwip_htons(n);
Michael J. Spencer 1:f5ac63519541 79 }
Michael J. Spencer 1:f5ac63519541 80
Michael J. Spencer 1:f5ac63519541 81 /**
Michael J. Spencer 1:f5ac63519541 82 * Convert an u32_t from host- to network byte order.
Michael J. Spencer 1:f5ac63519541 83 *
Michael J. Spencer 1:f5ac63519541 84 * @param n u32_t in host byte order
Michael J. Spencer 1:f5ac63519541 85 * @return n in network byte order
Michael J. Spencer 1:f5ac63519541 86 */
Michael J. Spencer 1:f5ac63519541 87 u32_t
Michael J. Spencer 1:f5ac63519541 88 lwip_htonl(u32_t n)
Michael J. Spencer 1:f5ac63519541 89 {
Michael J. Spencer 1:f5ac63519541 90 return ((n & 0xff) << 24) |
Michael J. Spencer 1:f5ac63519541 91 ((n & 0xff00) << 8) |
Michael J. Spencer 1:f5ac63519541 92 ((n & 0xff0000UL) >> 8) |
Michael J. Spencer 1:f5ac63519541 93 ((n & 0xff000000UL) >> 24);
Michael J. Spencer 1:f5ac63519541 94 }
Michael J. Spencer 1:f5ac63519541 95
Michael J. Spencer 1:f5ac63519541 96 /**
Michael J. Spencer 1:f5ac63519541 97 * Convert an u32_t from network- to host byte order.
Michael J. Spencer 1:f5ac63519541 98 *
Michael J. Spencer 1:f5ac63519541 99 * @param n u32_t in network byte order
Michael J. Spencer 1:f5ac63519541 100 * @return n in host byte order
Michael J. Spencer 1:f5ac63519541 101 */
Michael J. Spencer 1:f5ac63519541 102 u32_t
Michael J. Spencer 1:f5ac63519541 103 lwip_ntohl(u32_t n)
Michael J. Spencer 1:f5ac63519541 104 {
Michael J. Spencer 1:f5ac63519541 105 return lwip_htonl(n);
Michael J. Spencer 1:f5ac63519541 106 }
Michael J. Spencer 1:f5ac63519541 107
Michael J. Spencer 1:f5ac63519541 108 #endif /* (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN) */