123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108 |
- /**
- * @file
- * Common functions used throughout the stack.
- *
- */
- /*
- * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
- * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
- * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
- * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
- * OF SUCH DAMAGE.
- *
- * This file is part of the lwIP TCP/IP stack.
- *
- * Author: Simon Goldschmidt
- *
- */
- #include "lwip/opt.h"
- #include "lwip/def.h"
- /**
- * These are reference implementations of the byte swapping functions.
- * Again with the aim of being simple, correct and fully portable.
- * Byte swapping is the second thing you would want to optimize. You will
- * need to port it to your architecture and in your cc.h:
- *
- * #define LWIP_PLATFORM_BYTESWAP 1
- * #define LWIP_PLATFORM_HTONS(x) <your_htons>
- * #define LWIP_PLATFORM_HTONL(x) <your_htonl>
- *
- * Note ntohs() and ntohl() are merely references to the htonx counterparts.
- */
- #if (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN)
- /**
- * Convert an u16_t from host- to network byte order.
- *
- * @param n u16_t in host byte order
- * @return n in network byte order
- */
- u16_t
- lwip_htons(u16_t n)
- {
- return ((n & 0xff) << 8) | ((n & 0xff00) >> 8);
- }
- /**
- * Convert an u16_t from network- to host byte order.
- *
- * @param n u16_t in network byte order
- * @return n in host byte order
- */
- u16_t
- lwip_ntohs(u16_t n)
- {
- return lwip_htons(n);
- }
- /**
- * Convert an u32_t from host- to network byte order.
- *
- * @param n u32_t in host byte order
- * @return n in network byte order
- */
- u32_t
- lwip_htonl(u32_t n)
- {
- return ((n & 0xff) << 24) |
- ((n & 0xff00) << 8) |
- ((n & 0xff0000UL) >> 8) |
- ((n & 0xff000000UL) >> 24);
- }
- /**
- * Convert an u32_t from network- to host byte order.
- *
- * @param n u32_t in network byte order
- * @return n in host byte order
- */
- u32_t
- lwip_ntohl(u32_t n)
- {
- return lwip_htonl(n);
- }
- #endif /* (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN) */
|