1// endianess.h 2// 3// Copyright (c) 2003, Ingo Weinhold (bonefish@cs.tu-berlin.de) 4// 5// This program is free software; you can redistribute it and/or modify 6// it under the terms of the GNU General Public License as published by 7// the Free Software Foundation; either version 2 of the License, or 8// (at your option) any later version. 9// 10// This program is distributed in the hope that it will be useful, 11// but WITHOUT ANY WARRANTY; without even the implied warranty of 12// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13// GNU General Public License for more details. 14// 15// You should have received a copy of the GNU General Public License 16// along with this program; if not, write to the Free Software 17// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18// 19// You can alternatively use *this file* under the terms of the the MIT 20// license included in this package. 21 22#ifndef ENDIANESS_H 23#define ENDIANESS_H 24 25#include <endian.h> 26#include <SupportDefs.h> 27 28/*! 29 \file endianess.h 30 \break Endianess conversion support functions. 31 32 The functions le2h() and h2le() convert various integer types from 33 little endian to host format and vice versa respectively. 34*/ 35 36// swap_value 37static inline 38uint8 39swap_value(uint8 v) 40{ 41 return v; 42} 43 44// swap_value 45static inline 46int8 47swap_value(int8 v) 48{ 49 return v; 50} 51 52// swap_value 53static inline 54uint16 55swap_value(uint16 v) 56{ 57 return ((v & 0xff) << 8) | (v >> 8); 58} 59 60// swap_value 61static inline 62int16 63swap_value(int16 v) 64{ 65 return (int16)swap_value((uint16)v); 66} 67 68// swap_value 69static inline 70uint32 71swap_value(uint32 v) 72{ 73 return ((v & 0xff) << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) 74 | (v >> 24); 75} 76 77// swap_value 78static inline 79int32 80swap_value(int32 v) 81{ 82 return (int32)swap_value((uint32)v); 83} 84 85// swap_value 86static inline 87uint64 88swap_value(uint64 v) 89{ 90 return (uint64(swap_value(uint32(v & 0xffffffffULL))) << 32) 91 | uint64(swap_value(uint32((v & 0xffffffff00000000ULL) >> 32))); 92} 93 94// swap_value 95static inline 96int64 97swap_value(int64 v) 98{ 99 return (int64)swap_value((uint64)v); 100} 101 102// le2h 103template<typename T> 104static inline 105T 106le2h(const T &v) 107{ 108#if LITTLE_ENDIAN 109 return v; 110#else 111 return swap_value(v); 112#endif 113} 114 115// h2le 116template<typename T> 117static inline 118T 119h2le(const T &v) 120{ 121#if LITTLE_ENDIAN 122 return v; 123#else 124 return swap_value(v); 125#endif 126} 127 128#endif // ENDIANESS_H 129