libdballe  5.18
byteswap.h
00001 #ifndef DBALLE_CORE_BYTESWAP_H
00002 #define DBALLE_CORE_BYTESWAP_H
00003 
00004 #include "config.h"
00005 
00006 #if USE_OWN_BSWAP
00007 
00008 /* byteswap.h - Byte swapping
00009    Copyright (C) 2005, 2007, 2009-2011 Free Software Foundation, Inc.
00010    Written by Oskar Liljeblad <oskar@osk.mine.nu>, 2005.
00011 
00012    This program is free software: you can redistribute it and/or modify
00013    it under the terms of the GNU General Public License as published by
00014    the Free Software Foundation; either version 3 of the License, or
00015    (at your option) any later version.
00016 
00017    This program is distributed in the hope that it will be useful,
00018    but WITHOUT ANY WARRANTY; without even the implied warranty of
00019    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00020    GNU General Public License for more details.
00021 
00022    You should have received a copy of the GNU General Public License
00023    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
00024 
00025 /* Given an unsigned 16-bit argument X, return the value corresponding to
00026    X with reversed byte order.  */
00027 #define bswap_16(x) ((((x) & 0x00FF) << 8) | \
00028                      (((x) & 0xFF00) >> 8))
00029 
00030 /* Given an unsigned 32-bit argument X, return the value corresponding to
00031    X with reversed byte order.  */
00032 #define bswap_32(x) ((((x) & 0x000000FF) << 24) | \
00033                      (((x) & 0x0000FF00) << 8) | \
00034                      (((x) & 0x00FF0000) >> 8) | \
00035                      (((x) & 0xFF000000) >> 24))
00036 
00037 /* Given an unsigned 64-bit argument X, return the value corresponding to
00038    X with reversed byte order.  */
00039 #define bswap_64(x) ((((x) & 0x00000000000000FFULL) << 56) | \
00040                      (((x) & 0x000000000000FF00ULL) << 40) | \
00041                      (((x) & 0x0000000000FF0000ULL) << 24) | \
00042                      (((x) & 0x00000000FF000000ULL) << 8) | \
00043                      (((x) & 0x000000FF00000000ULL) >> 8) | \
00044                      (((x) & 0x0000FF0000000000ULL) >> 24) | \
00045                      (((x) & 0x00FF000000000000ULL) >> 40) | \
00046                      (((x) & 0xFF00000000000000ULL) >> 56))
00047 #else
00048 
00049 #include <byteswap.h>
00050 
00051 #endif
00052 
00053 #endif