[164] | 1 | /**
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| 2 | * @file
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| 3 | * Common functions used throughout the stack.
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| 4 | *
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| 5 | */
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| 6 |
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| 7 | /*
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| 8 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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| 9 | * All rights reserved.
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| 10 | *
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| 11 | * Redistribution and use in source and binary forms, with or without modification,
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| 12 | * are permitted provided that the following conditions are met:
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| 13 | *
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| 14 | * 1. Redistributions of source code must retain the above copyright notice,
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| 15 | * this list of conditions and the following disclaimer.
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 17 | * this list of conditions and the following disclaimer in the documentation
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| 18 | * and/or other materials provided with the distribution.
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| 19 | * 3. The name of the author may not be used to endorse or promote products
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| 20 | * derived from this software without specific prior written permission.
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| 21 | *
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| 22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 25 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 27 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 30 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 31 | * OF SUCH DAMAGE.
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| 32 | *
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| 33 | * This file is part of the lwIP TCP/IP stack.
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| 34 | *
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| 35 | * Author: Simon Goldschmidt
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| 36 | *
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| 37 | */
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| 38 |
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| 39 | #include "lwip/opt.h"
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| 40 | #include "lwip/def.h"
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| 41 |
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| 42 | /**
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| 43 | * These are reference implementations of the byte swapping functions.
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| 44 | * Again with the aim of being simple, correct and fully portable.
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| 45 | * Byte swapping is the second thing you would want to optimize. You will
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| 46 | * need to port it to your architecture and in your cc.h:
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| 47 | *
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| 48 | * #define LWIP_PLATFORM_BYTESWAP 1
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| 49 | * #define LWIP_PLATFORM_HTONS(x) <your_htons>
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| 50 | * #define LWIP_PLATFORM_HTONL(x) <your_htonl>
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| 51 | *
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| 52 | * Note ntohs() and ntohl() are merely references to the htonx counterparts.
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| 53 | */
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| 54 |
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| 55 | #if (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN)
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| 56 |
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| 57 | /**
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| 58 | * Convert an u16_t from host- to network byte order.
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| 59 | *
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| 60 | * @param n u16_t in host byte order
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| 61 | * @return n in network byte order
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| 62 | */
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| 63 | u16_t
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| 64 | lwip_htons(u16_t n)
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| 65 | {
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| 66 | return ((n & 0xff) << 8) | ((n & 0xff00) >> 8);
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| 67 | }
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| 68 |
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| 69 | /**
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| 70 | * Convert an u16_t from network- to host byte order.
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| 71 | *
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| 72 | * @param n u16_t in network byte order
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| 73 | * @return n in host byte order
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| 74 | */
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| 75 | u16_t
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| 76 | lwip_ntohs(u16_t n)
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| 77 | {
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| 78 | return lwip_htons(n);
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| 79 | }
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| 80 |
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| 81 | /**
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| 82 | * Convert an u32_t from host- to network byte order.
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| 83 | *
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| 84 | * @param n u32_t in host byte order
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| 85 | * @return n in network byte order
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| 86 | */
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| 87 | u32_t
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| 88 | lwip_htonl(u32_t n)
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| 89 | {
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| 90 | return ((n & 0xff) << 24) |
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| 91 | ((n & 0xff00) << 8) |
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| 92 | ((n & 0xff0000UL) >> 8) |
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| 93 | ((n & 0xff000000UL) >> 24);
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| 94 | }
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| 95 |
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| 96 | /**
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| 97 | * Convert an u32_t from network- to host byte order.
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| 98 | *
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| 99 | * @param n u32_t in network byte order
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| 100 | * @return n in host byte order
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| 101 | */
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| 102 | u32_t
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| 103 | lwip_ntohl(u32_t n)
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| 104 | {
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| 105 | return lwip_htonl(n);
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| 106 | }
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| 107 |
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| 108 | #endif /* (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN) */
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