Wayne Jay / EthernetInterface

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Dependents:   K64F_eCompass_OneNET_JW

lwip/core/def.c@0:b2805b6888dc, 2016-06-20 (annotated)

Committer:
robert_jw
Date:
Mon Jun 20 01:40:20 2016 +0000
Revision:
0:b2805b6888dc
ADS

Who changed what in which revision?

UserRevisionLine numberNew contents of line
robert_jw 0:b2805b6888dc 1 /**
robert_jw 0:b2805b6888dc 2 * @file
robert_jw 0:b2805b6888dc 3 * Common functions used throughout the stack.
robert_jw 0:b2805b6888dc 4 *
robert_jw 0:b2805b6888dc 5 */
robert_jw 0:b2805b6888dc 6
robert_jw 0:b2805b6888dc 7 /*
robert_jw 0:b2805b6888dc 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
robert_jw 0:b2805b6888dc 9 * All rights reserved.
robert_jw 0:b2805b6888dc 10 *
robert_jw 0:b2805b6888dc 11 * Redistribution and use in source and binary forms, with or without modification,
robert_jw 0:b2805b6888dc 12 * are permitted provided that the following conditions are met:
robert_jw 0:b2805b6888dc 13 *
robert_jw 0:b2805b6888dc 14 * 1. Redistributions of source code must retain the above copyright notice,
robert_jw 0:b2805b6888dc 15 * this list of conditions and the following disclaimer.
robert_jw 0:b2805b6888dc 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
robert_jw 0:b2805b6888dc 17 * this list of conditions and the following disclaimer in the documentation
robert_jw 0:b2805b6888dc 18 * and/or other materials provided with the distribution.
robert_jw 0:b2805b6888dc 19 * 3. The name of the author may not be used to endorse or promote products
robert_jw 0:b2805b6888dc 20 * derived from this software without specific prior written permission.
robert_jw 0:b2805b6888dc 21 *
robert_jw 0:b2805b6888dc 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
robert_jw 0:b2805b6888dc 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
robert_jw 0:b2805b6888dc 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
robert_jw 0:b2805b6888dc 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
robert_jw 0:b2805b6888dc 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
robert_jw 0:b2805b6888dc 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
robert_jw 0:b2805b6888dc 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
robert_jw 0:b2805b6888dc 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
robert_jw 0:b2805b6888dc 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
robert_jw 0:b2805b6888dc 31 * OF SUCH DAMAGE.
robert_jw 0:b2805b6888dc 32 *
robert_jw 0:b2805b6888dc 33 * This file is part of the lwIP TCP/IP stack.
robert_jw 0:b2805b6888dc 34 *
robert_jw 0:b2805b6888dc 35 * Author: Simon Goldschmidt
robert_jw 0:b2805b6888dc 36 *
robert_jw 0:b2805b6888dc 37 */
robert_jw 0:b2805b6888dc 38
robert_jw 0:b2805b6888dc 39 #include "lwip/opt.h"
robert_jw 0:b2805b6888dc 40 #include "lwip/def.h"
robert_jw 0:b2805b6888dc 41
robert_jw 0:b2805b6888dc 42 /**
robert_jw 0:b2805b6888dc 43 * These are reference implementations of the byte swapping functions.
robert_jw 0:b2805b6888dc 44 * Again with the aim of being simple, correct and fully portable.
robert_jw 0:b2805b6888dc 45 * Byte swapping is the second thing you would want to optimize. You will
robert_jw 0:b2805b6888dc 46 * need to port it to your architecture and in your cc.h:
robert_jw 0:b2805b6888dc 47 *
robert_jw 0:b2805b6888dc 48 * #define LWIP_PLATFORM_BYTESWAP 1
robert_jw 0:b2805b6888dc 49 * #define LWIP_PLATFORM_HTONS(x) <your_htons>
robert_jw 0:b2805b6888dc 50 * #define LWIP_PLATFORM_HTONL(x) <your_htonl>
robert_jw 0:b2805b6888dc 51 *
robert_jw 0:b2805b6888dc 52 * Note ntohs() and ntohl() are merely references to the htonx counterparts.
robert_jw 0:b2805b6888dc 53 */
robert_jw 0:b2805b6888dc 54
robert_jw 0:b2805b6888dc 55 #if (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN)
robert_jw 0:b2805b6888dc 56
robert_jw 0:b2805b6888dc 57 /**
robert_jw 0:b2805b6888dc 58 * Convert an u16_t from host- to network byte order.
robert_jw 0:b2805b6888dc 59 *
robert_jw 0:b2805b6888dc 60 * @param n u16_t in host byte order
robert_jw 0:b2805b6888dc 61 * @return n in network byte order
robert_jw 0:b2805b6888dc 62 */
robert_jw 0:b2805b6888dc 63 u16_t
robert_jw 0:b2805b6888dc 64 lwip_htons(u16_t n)
robert_jw 0:b2805b6888dc 65 {
robert_jw 0:b2805b6888dc 66 return ((n & 0xff) << 8) | ((n & 0xff00) >> 8);
robert_jw 0:b2805b6888dc 67 }
robert_jw 0:b2805b6888dc 68
robert_jw 0:b2805b6888dc 69 /**
robert_jw 0:b2805b6888dc 70 * Convert an u16_t from network- to host byte order.
robert_jw 0:b2805b6888dc 71 *
robert_jw 0:b2805b6888dc 72 * @param n u16_t in network byte order
robert_jw 0:b2805b6888dc 73 * @return n in host byte order
robert_jw 0:b2805b6888dc 74 */
robert_jw 0:b2805b6888dc 75 u16_t
robert_jw 0:b2805b6888dc 76 lwip_ntohs(u16_t n)
robert_jw 0:b2805b6888dc 77 {
robert_jw 0:b2805b6888dc 78 return lwip_htons(n);
robert_jw 0:b2805b6888dc 79 }
robert_jw 0:b2805b6888dc 80
robert_jw 0:b2805b6888dc 81 /**
robert_jw 0:b2805b6888dc 82 * Convert an u32_t from host- to network byte order.
robert_jw 0:b2805b6888dc 83 *
robert_jw 0:b2805b6888dc 84 * @param n u32_t in host byte order
robert_jw 0:b2805b6888dc 85 * @return n in network byte order
robert_jw 0:b2805b6888dc 86 */
robert_jw 0:b2805b6888dc 87 u32_t
robert_jw 0:b2805b6888dc 88 lwip_htonl(u32_t n)
robert_jw 0:b2805b6888dc 89 {
robert_jw 0:b2805b6888dc 90 return ((n & 0xff) << 24) |
robert_jw 0:b2805b6888dc 91 ((n & 0xff00) << 8) |
robert_jw 0:b2805b6888dc 92 ((n & 0xff0000UL) >> 8) |
robert_jw 0:b2805b6888dc 93 ((n & 0xff000000UL) >> 24);
robert_jw 0:b2805b6888dc 94 }
robert_jw 0:b2805b6888dc 95
robert_jw 0:b2805b6888dc 96 /**
robert_jw 0:b2805b6888dc 97 * Convert an u32_t from network- to host byte order.
robert_jw 0:b2805b6888dc 98 *
robert_jw 0:b2805b6888dc 99 * @param n u32_t in network byte order
robert_jw 0:b2805b6888dc 100 * @return n in host byte order
robert_jw 0:b2805b6888dc 101 */
robert_jw 0:b2805b6888dc 102 u32_t
robert_jw 0:b2805b6888dc 103 lwip_ntohl(u32_t n)
robert_jw 0:b2805b6888dc 104 {
robert_jw 0:b2805b6888dc 105 return lwip_htonl(n);
robert_jw 0:b2805b6888dc 106 }
robert_jw 0:b2805b6888dc 107
robert_jw 0:b2805b6888dc 108 #endif /* (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN) */