/usr/include/zim/endian.h is in libzim-dev 1.4-2.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2006 Tommi Maekitalo
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* is provided AS IS, WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, and
* NON-INFRINGEMENT. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifndef ENDIAN_H
#define ENDIAN_H
#include <algorithm>
#include <iostream>
#include <zim/zim.h>
namespace zim
{
/// Returns true, if machine is big-endian (high byte first).
/// e.g. PowerPC
inline bool isBigEndian()
{
const int i = 1;
return *reinterpret_cast<const int8_t*>(&i) == 0;
}
/// Returns true, if machine is little-endian (low byte first).
/// e.g. x86
inline bool isLittleEndian()
{
const int i = 1;
return *reinterpret_cast<const int8_t*>(&i) == 1;
}
////////////////////////////////////////////////////////////////////////
template <typename T>
void toLittleEndian(const T& d, char* dst, bool bigEndian = isBigEndian())
{
if (bigEndian)
{
std::reverse_copy(
reinterpret_cast<const char*>(&d),
reinterpret_cast<const char*>(&d) + sizeof(T),
dst);
}
else
{
std::copy(
reinterpret_cast<const char*>(&d),
reinterpret_cast<const char*>(&d) + sizeof(T),
dst);
}
}
template <typename T>
T fromLittleEndian(const T* ptr, bool bigEndian = isBigEndian())
{
if (bigEndian)
{
T ret;
std::reverse_copy(reinterpret_cast<const int8_t*>(ptr),
reinterpret_cast<const int8_t*>(ptr) + sizeof(T),
reinterpret_cast<int8_t*>(&ret));
return ret;
}
else
{
return *ptr;
}
}
////////////////////////////////////////////////////////////////////////
template <typename T>
void toBigEndian(const T& d, char* dst, bool bigEndian = isBigEndian())
{
if (bigEndian)
{
std::copy(
reinterpret_cast<const char*>(&d),
reinterpret_cast<const char*>(&d) + sizeof(T),
dst);
}
else
{
std::reverse_copy(
reinterpret_cast<const char*>(&d),
reinterpret_cast<const char*>(&d) + sizeof(T),
dst);
}
}
template <typename T>
T fromBigEndian(const T* ptr, bool bigEndian = isBigEndian())
{
if (bigEndian)
{
return *ptr;
}
else
{
T ret;
std::reverse_copy(reinterpret_cast<const int8_t*>(ptr),
reinterpret_cast<const int8_t*>(ptr) + sizeof(T),
reinterpret_cast<int8_t*>(&ret));
return ret;
}
}
}
#endif // ENDIAN_H
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