comparison: src/protocols/icq/icqbyteorder.h
src/protocols/icq/icqbyteorder.h
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| 1 /* | |
| 2 * $Id: icqbyteorder.h 2096 2001-07-31 01:00:39Z warmenhoven $ | |
| 3 * | |
| 4 * This header defines macros to handle ICQ protocol byte order conversion. | |
| 5 * | |
| 6 * Vadim Zaliva <lord@crocodile.org> | |
| 7 * http://www.crocodile.org/ | |
| 8 * | |
| 9 * Copyright (C) 1999 Vadim Zaliva | |
| 10 * | |
| 11 * This program is free software; you can redistribute it and/or modify | |
| 12 * it under the terms of the GNU General Public License as published by | |
| 13 * the Free Software Foundation; either version 2 of the License, or | |
| 14 * (at your option) any later version. | |
| 15 * | |
| 16 * This program is distributed in the hope that it will be useful, | |
| 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 19 * GNU General Public License for more details. | |
| 20 * | |
| 21 * You should have received a copy of the GNU General Public License | |
| 22 * along with this program; if not, write to the Free Software | |
| 23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
| 24 * | |
| 25 */ | |
| 26 | |
| 27 /* | |
| 28 * From ICQ protocol description: | |
| 29 * "Integers consisting of more than one byte is stored | |
| 30 * with the least significant byte first, and the most significant byte last | |
| 31 * (as is usual on the PC/Intel architecture)". | |
| 32 * | |
| 33 * whereas the network byte order, as used on the | |
| 34 * Internet, is Most Significant Byte first. (aka. Big Endian) | |
| 35 */ | |
| 36 | |
| 37 #ifndef ICQ_BYTEORDER_H_FLAG | |
| 38 #define ICQ_BYTEORDER_H_FLAG | |
| 39 | |
| 40 #ifdef HAVE_CONFIG_H | |
| 41 #include <config.h> | |
| 42 #endif | |
| 43 | |
| 44 /* | |
| 45 * I am really trying to use builtin optimized byte swap routines. | |
| 46 * they are highly optimised on some platforms. | |
| 47 * But as last resort this simple code is used. | |
| 48 */ | |
| 49 #ifndef HAVE_BYTESWAP_H | |
| 50 # ifndef bswap_32 | |
| 51 extern unsigned long bswap_32(unsigned long v); | |
| 52 # endif | |
| 53 # ifndef bswap_16 | |
| 54 extern unsigned short bswap_16(unsigned short v); | |
| 55 # endif | |
| 56 #endif | |
| 57 | |
| 58 #ifdef WORDS_BIGENDIAN | |
| 59 # define htoicql(x) bswap_32(x) | |
| 60 # define icqtohl(x) bswap_32(x) | |
| 61 # define htoicqs(x) bswap_16(x) | |
| 62 # define icqtohs(x) bswap_16(x) | |
| 63 #else | |
| 64 # define htoicql(x) (x) | |
| 65 # define icqtohl(x) (x) | |
| 66 # define htoicqs(x) (x) | |
| 67 # define icqtohs(x) (x) | |
| 68 #endif | |
| 69 | |
| 70 #endif |
