Disk ARchive 2.3.11
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00001 /*********************************************************************/ 00002 // dar - disk archive - a backup/restoration program 00003 // Copyright (C) 2002-2052 Denis Corbin 00004 // 00005 // This program is free software; you can redistribute it and/or 00006 // modify it under the terms of the GNU General Public License 00007 // as published by the Free Software Foundation; either version 2 00008 // of the License, or (at your option) any later version. 00009 // 00010 // This program is distributed in the hope that it will be useful, 00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00013 // GNU General Public License for more details. 00014 // 00015 // You should have received a copy of the GNU General Public License 00016 // along with this program; if not, write to the Free Software 00017 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 00018 // 00019 // to contact the author : dar.linux@free.fr 00020 /*********************************************************************/ 00021 // $Id: int_tools.hpp,v 1.3 2004/11/07 18:21:38 edrusb Rel $ 00022 // 00023 /*********************************************************************/ 00024 00028 00029 #ifndef INT_TOOLS_HPP 00030 #define INT_TOOLS_HPP 00031 00032 #include "../my_config.h" 00033 00034 #include "integers.hpp" 00035 #include "erreurs.hpp" 00036 00037 namespace libdar 00038 { 00039 typedef unsigned char int_tools_bitfield[8]; 00040 00041 extern void int_tools_swap_bytes(unsigned char &a, unsigned char &b); 00042 extern void int_tools_swap_bytes(unsigned char *a, U_I size); 00043 extern void int_tools_expand_byte(unsigned char a, int_tools_bitfield &bit); 00044 extern void int_tools_contract_byte(const int_tools_bitfield &b, unsigned char & a); 00045 00046 // integer (agregates) manipulations 00047 // argument must be a regular interger (a bit field). 00048 template <class T> extern T int_tools_rotate_right_one_bit(T v) 00049 { 00050 bool retenue = (v & 1) != 0; 00051 00052 v >>= 1; 00053 if(retenue) 00054 v |= T(1) << (sizeof(v)*8 - 1); 00055 00056 return v; 00057 } 00058 00059 template <class T> extern T int_tools_maxof_agregate(T unused) { return ~T(0) > 0 ? ~T(0) : ~int_tools_rotate_right_one_bit(T(1)); } 00060 00061 template <class B> static B int_tools_higher_power_of_2(B val) 00062 { 00063 B i = 0; 00064 00065 while((val >> i) > 1) 00066 i++; 00067 00068 return i; 00069 } 00070 00071 } 00072 00073 #endif