/usr/include/cxxtools/byteorder.h is in libcxxtools-dev 2.2.1-2.
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) 2007 Tommi Maekitalo
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* As a special exception, you may use this file as part of a free
* software library without restriction. Specifically, if other files
* instantiate templates or use macros or inline functions from this
* file, or you compile this file and link it with other files to
* produce an executable, this file does not by itself cause the
* resulting executable to be covered by the GNU General Public
* License. This exception does not however invalidate any other
* reasons why the executable file might be covered by the GNU Library
* General Public License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef CXXTOOLS_BYTEORDER_H
#define CXXTOOLS_BYTEORDER_H
#include <algorithm>
#include <endian.h>
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define CXXTOOLS_LITTLE_ENDIAN
#elif __BYTE_ORDER == __BIG_ENDIAN
#define CXXTOOLS_BIG_ENDIAN
#endif
namespace cxxtools
{
template <typename T, unsigned sizeofT>
class Reverser;
template <typename T>
class Reverser<T, 2>
{
public:
T operator() (T value)
{
return value >> 8 & 0xff
| value << 8 & 0xff00;
}
};
template <typename T>
class Reverser<T, 4>
{
public:
T operator() (T value)
{
return value >> 24 & 0xff
| value >> 8 & 0xff00
| value << 8 & 0xff0000
| value << 24 & 0xff000000;
}
};
template <typename T>
class Reverser<T, 8>
{
public:
T operator() (T value)
{
return value >> 56 & 0xffll
| value >> 40 & 0xff00ll
| value >> 24 & 0xff0000ll
| value >> 8 & 0xff000000ll
| value << 8 & 0xff00000000ll
| value << 24 & 0xff0000000000ll
| value << 40 & 0xff000000000000ll
| value << 56 & 0xff00000000000000ll;
}
};
template <typename T>
T reverse(T value)
{
return Reverser<T, sizeof(T)>() (value);
}
/// 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;
}
/// Converts a native value in little endian.
template <typename T>
T hostToLe(T value)
{
#if defined(CXXTOOLS_BIG_ENDIAN)
return reverse(value);
#elif defined(CXXTOOLS_LITTLE_ENDIAN)
return value;
#else
return isBigEndian() ? reverse(value) : value;
#endif
}
/// Converts a little endian value to native.
template <typename T>
T leToHost(T value)
{
#if defined(CXXTOOLS_BIG_ENDIAN)
return reverse(value);
#elif defined(CXXTOOLS_LITTLE_ENDIAN)
return value;
#else
return isBigEndian() ? reverse(value) : value;
#endif
}
/// Converts a native value in big endian.
template <typename T>
T hostToBe(T value)
{
#if defined(CXXTOOLS_BIG_ENDIAN)
return value;
#elif defined(CXXTOOLS_LITTLE_ENDIAN)
return reverse(value);
#else
return isBigEndian() ? value : reverse(value);
#endif
}
/// Converts a big endian value to native.
template <typename T>
T beToHost(T value)
{
#if defined(CXXTOOLS_BIG_ENDIAN)
return value;
#elif defined(CXXTOOLS_LITTLE_ENDIAN)
return reverse(value);
#else
return isBigEndian() ? value : reverse(value);
#endif
}
}
#endif // CXXTOOLS_BYTEORDER_H
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