Adam Green / EthernetInterface

Deprecated fork of old network stack source from github. Please use official library instead: https://mbed.org/users/mbed_official/code/EthernetInterface/

lwip/core/def.c@1:eadc868c2acf, 2013-10-26 (annotated)

Committer:
AdamGreen
Date:
Sat Oct 26 08:51:36 2013 +0000
Revision:
1:eadc868c2acf
Parent:
0:3b00827bb0b7 
Fix TCP checksum bug and stranded large TCP segments.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AdamGreen 0:3b00827bb0b7 1 /**
AdamGreen 0:3b00827bb0b7 2 * @file
AdamGreen 0:3b00827bb0b7 3 * Common functions used throughout the stack.
AdamGreen 0:3b00827bb0b7 4 *
AdamGreen 0:3b00827bb0b7 5 */
AdamGreen 0:3b00827bb0b7 6
AdamGreen 0:3b00827bb0b7 7 /*
AdamGreen 0:3b00827bb0b7 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
AdamGreen 0:3b00827bb0b7 9 * All rights reserved.
AdamGreen 0:3b00827bb0b7 10 *
AdamGreen 0:3b00827bb0b7 11 * Redistribution and use in source and binary forms, with or without modification,
AdamGreen 0:3b00827bb0b7 12 * are permitted provided that the following conditions are met:
AdamGreen 0:3b00827bb0b7 13 *
AdamGreen 0:3b00827bb0b7 14 * 1. Redistributions of source code must retain the above copyright notice,
AdamGreen 0:3b00827bb0b7 15 * this list of conditions and the following disclaimer.
AdamGreen 0:3b00827bb0b7 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
AdamGreen 0:3b00827bb0b7 17 * this list of conditions and the following disclaimer in the documentation
AdamGreen 0:3b00827bb0b7 18 * and/or other materials provided with the distribution.
AdamGreen 0:3b00827bb0b7 19 * 3. The name of the author may not be used to endorse or promote products
AdamGreen 0:3b00827bb0b7 20 * derived from this software without specific prior written permission.
AdamGreen 0:3b00827bb0b7 21 *
AdamGreen 0:3b00827bb0b7 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
AdamGreen 0:3b00827bb0b7 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
AdamGreen 0:3b00827bb0b7 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
AdamGreen 0:3b00827bb0b7 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
AdamGreen 0:3b00827bb0b7 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
AdamGreen 0:3b00827bb0b7 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
AdamGreen 0:3b00827bb0b7 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
AdamGreen 0:3b00827bb0b7 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
AdamGreen 0:3b00827bb0b7 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
AdamGreen 0:3b00827bb0b7 31 * OF SUCH DAMAGE.
AdamGreen 0:3b00827bb0b7 32 *
AdamGreen 0:3b00827bb0b7 33 * This file is part of the lwIP TCP/IP stack.
AdamGreen 0:3b00827bb0b7 34 *
AdamGreen 0:3b00827bb0b7 35 * Author: Simon Goldschmidt
AdamGreen 0:3b00827bb0b7 36 *
AdamGreen 0:3b00827bb0b7 37 */
AdamGreen 0:3b00827bb0b7 38
AdamGreen 0:3b00827bb0b7 39 #include "lwip/opt.h"
AdamGreen 0:3b00827bb0b7 40 #include "lwip/def.h"
AdamGreen 0:3b00827bb0b7 41
AdamGreen 0:3b00827bb0b7 42 /**
AdamGreen 0:3b00827bb0b7 43 * These are reference implementations of the byte swapping functions.
AdamGreen 0:3b00827bb0b7 44 * Again with the aim of being simple, correct and fully portable.
AdamGreen 0:3b00827bb0b7 45 * Byte swapping is the second thing you would want to optimize. You will
AdamGreen 0:3b00827bb0b7 46 * need to port it to your architecture and in your cc.h:
AdamGreen 0:3b00827bb0b7 47 *
AdamGreen 0:3b00827bb0b7 48 * #define LWIP_PLATFORM_BYTESWAP 1
AdamGreen 0:3b00827bb0b7 49 * #define LWIP_PLATFORM_HTONS(x) <your_htons>
AdamGreen 0:3b00827bb0b7 50 * #define LWIP_PLATFORM_HTONL(x) <your_htonl>
AdamGreen 0:3b00827bb0b7 51 *
AdamGreen 0:3b00827bb0b7 52 * Note ntohs() and ntohl() are merely references to the htonx counterparts.
AdamGreen 0:3b00827bb0b7 53 */
AdamGreen 0:3b00827bb0b7 54
AdamGreen 0:3b00827bb0b7 55 #if (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN)
AdamGreen 0:3b00827bb0b7 56
AdamGreen 0:3b00827bb0b7 57 /**
AdamGreen 0:3b00827bb0b7 58 * Convert an u16_t from host- to network byte order.
AdamGreen 0:3b00827bb0b7 59 *
AdamGreen 0:3b00827bb0b7 60 * @param n u16_t in host byte order
AdamGreen 0:3b00827bb0b7 61 * @return n in network byte order
AdamGreen 0:3b00827bb0b7 62 */
AdamGreen 0:3b00827bb0b7 63 u16_t
AdamGreen 0:3b00827bb0b7 64 lwip_htons(u16_t n)
AdamGreen 0:3b00827bb0b7 65 {
AdamGreen 0:3b00827bb0b7 66 return ((n & 0xff) << 8) | ((n & 0xff00) >> 8);
AdamGreen 0:3b00827bb0b7 67 }
AdamGreen 0:3b00827bb0b7 68
AdamGreen 0:3b00827bb0b7 69 /**
AdamGreen 0:3b00827bb0b7 70 * Convert an u16_t from network- to host byte order.
AdamGreen 0:3b00827bb0b7 71 *
AdamGreen 0:3b00827bb0b7 72 * @param n u16_t in network byte order
AdamGreen 0:3b00827bb0b7 73 * @return n in host byte order
AdamGreen 0:3b00827bb0b7 74 */
AdamGreen 0:3b00827bb0b7 75 u16_t
AdamGreen 0:3b00827bb0b7 76 lwip_ntohs(u16_t n)
AdamGreen 0:3b00827bb0b7 77 {
AdamGreen 0:3b00827bb0b7 78 return lwip_htons(n);
AdamGreen 0:3b00827bb0b7 79 }
AdamGreen 0:3b00827bb0b7 80
AdamGreen 0:3b00827bb0b7 81 /**
AdamGreen 0:3b00827bb0b7 82 * Convert an u32_t from host- to network byte order.
AdamGreen 0:3b00827bb0b7 83 *
AdamGreen 0:3b00827bb0b7 84 * @param n u32_t in host byte order
AdamGreen 0:3b00827bb0b7 85 * @return n in network byte order
AdamGreen 0:3b00827bb0b7 86 */
AdamGreen 0:3b00827bb0b7 87 u32_t
AdamGreen 0:3b00827bb0b7 88 lwip_htonl(u32_t n)
AdamGreen 0:3b00827bb0b7 89 {
AdamGreen 0:3b00827bb0b7 90 return ((n & 0xff) << 24) |
AdamGreen 0:3b00827bb0b7 91 ((n & 0xff00) << 8) |
AdamGreen 0:3b00827bb0b7 92 ((n & 0xff0000UL) >> 8) |
AdamGreen 0:3b00827bb0b7 93 ((n & 0xff000000UL) >> 24);
AdamGreen 0:3b00827bb0b7 94 }
AdamGreen 0:3b00827bb0b7 95
AdamGreen 0:3b00827bb0b7 96 /**
AdamGreen 0:3b00827bb0b7 97 * Convert an u32_t from network- to host byte order.
AdamGreen 0:3b00827bb0b7 98 *
AdamGreen 0:3b00827bb0b7 99 * @param n u32_t in network byte order
AdamGreen 0:3b00827bb0b7 100 * @return n in host byte order
AdamGreen 0:3b00827bb0b7 101 */
AdamGreen 0:3b00827bb0b7 102 u32_t
AdamGreen 0:3b00827bb0b7 103 lwip_ntohl(u32_t n)
AdamGreen 0:3b00827bb0b7 104 {
AdamGreen 0:3b00827bb0b7 105 return lwip_htonl(n);
AdamGreen 0:3b00827bb0b7 106 }
AdamGreen 0:3b00827bb0b7 107
AdamGreen 0:3b00827bb0b7 108 #endif /* (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN) */