/* byteorder64.c -- convert 64-bit values between host and network byte order * * Copyright (c) 2004 Carnegie Mellon University. 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 "Carnegie Mellon University" must not be used to * endorse or promote products derived from this software without * prior written permission. For permission or any other legal * details, please contact * Office of Technology Transfer * Carnegie Mellon University * 5000 Forbes Avenue * Pittsburgh, PA 15213-3890 * (412) 268-4387, fax: (412) 268-7395 * tech-transfer@andrew.cmu.edu * * 4. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by Computing Services * at Carnegie Mellon University (http://www.cmu.edu/computing/)." * * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * $Id: byteorder64.c,v 1.2 2006/11/30 17:11:22 murch Exp $ */ #include <config.h> #if defined(HAVE_LONG_LONG_INT) && !defined(WORDS_BIGENDIAN) #include <netinet/in.h> /* Structure used to swap the bytes in a 64-bit unsigned long long. */ union byteswap_64_u { unsigned long long a; uint32_t b[2]; }; /* Function to byteswap 64bit unsigned integers on * little endian machines to big endian network order. * On big endian machines this will be a null macro. * The macro htonll() is defined in byteorder64.h, * and if needed refers to _htonll() here. */ unsigned long long _htonll(unsigned long long x) { union byteswap_64_u u1; union byteswap_64_u u2; u1.a = x; u2.b[0] = htonl(u1.b[1]); u2.b[1] = htonl(u1.b[0]); return u2.a; } /* Function to byteswap big endian 64bit unsigned integers * back to little endian host order on little endian machines. * As above, on big endian machines this will be a null macro. * The macro ntohll() is defined in byteorder64.h, and if needed, * refers to _ntohll() here. */ unsigned long long _ntohll(unsigned long long x) { union byteswap_64_u u1; union byteswap_64_u u2; u1.a = x; u2.b[1] = ntohl(u1.b[0]); u2.b[0] = ntohl(u1.b[1]); return u2.a; } #endif /* defined(HAVE_LONG_LONG_INT) && !defined(WORDS_BIGENDIAN) */