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