src/framework/Utilities/ByteConverter.h

   1 /*
   2  * Copyright (C) 2005-2008 MaNGOS <http://getmangos.com/>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #ifndef MANGOS_BYTECONVERTER_H
  20 #define MANGOS_BYTECONVERTER_H
  21
  22 /** ByteConverter reverse your byte order.  This is use
  23     for cross platform where they have different endians.
  24  */
  25
  26 #include<Platform/Define.h>
  27 #include<algorithm>
  28
  29 namespace ByteConverter
  30 {
  31     template<size_t T>
  32         inline void convert(char *val)
  33     {
  34         std::swap(*val, *(val + T - 1));
  35         convert<T - 2>(val + 1);
  36     }
  37
  38     template<> inline void convert<0>(char *) {}
  39     template<> inline void convert<1>(char *) {}            // ignore central byte
  40
  41     template<typename T> inline void apply(T *val)
  42     {
  43         convert<sizeof(T)>((char *)(val));
  44     }
  45 }
  46
  47 #if MANGOS_ENDIAN == MANGOS_BIGENDIAN
  48 template<typename T> inline void EndianConvert(T& val) { ByteConverter::apply<T>(&val); }
  49 template<typename T> inline void EndianConvertReverse(T&) { }
  50 #else
  51 template<typename T> inline void EndianConvert(T&) { }
  52 template<typename T> inline void EndianConvertReverse(T& val) { ByteConverter::apply<T>(&val); }
  53 #endif
  54
  55 template<typename T> void EndianConvert(T*);         // will generate link error
  56 template<typename T> void EndianConvertReverse(T*);  // will generate link error
  57
  58 inline void EndianConvert(uint8&) { }
  59 inline void EndianConvert( int8&) { }
  60 inline void EndianConvertReverse(uint8&) { }
  61 inline void EndianConvertReverse( int8&) { }
  62
  63 #endif