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bemandawes
2011-05-21 21:09:29 +00:00
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boost/integer/conversion.hpp Normal file
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// boost/endian/conversion.hpp -------------------------------------------------------//
// Copyright Beman Dawes 2010, 2011
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
#ifndef BOOST_ENDIAN_CONVERSION_HPP
#define BOOST_ENDIAN_CONVERSION_HPP
#include <boost/detail/endian.hpp>
#include <boost/cstdint.hpp>
//------------------------------------- synopsis ---------------------------------------//
namespace boost
{
namespace endian
{
// unconditional modifying (i.e. in-place) endianness reversal
inline void flip(int16_t& x);
inline void flip(int32_t& x);
inline void flip(int64_t& x);
inline void flip(uint16_t& x);
inline void flip(uint32_t& x);
inline void flip(uint64_t& x);
// unconditional non-modifying endianness reversing copy
inline void flip(int16_t source, int16_t& target);
inline void flip(int32_t source, int32_t& target);
inline void flip(int64_t source, int64_t& target);
inline void flip(uint16_t source, uint16_t& target);
inline void flip(uint32_t source, uint32_t& target);
inline void flip(uint64_t source, uint64_t& target);
// conditional modifying (i.e. in-place) endianness reversal;
// no effect if native endianness and specified endianness are the same
template <class T> inline void to_big(T& x); // if different, convert native to big
template <class T> inline void to_little(T& x); // if different, convert native to little
template <class T> inline void from_big(T& x); // if different, convert big to native
template <class T> inline void from_little(T& x); // if different, convert little to native
// non-modifying copy, conditionally reversing endianness;
// copy the first argument to the second argument, converting to or from the
// specified endianness if different than native endianness
template <class T> inline void to_big(T native, T& big);
template <class T> inline void to_little(T native, T& little);
template <class T> inline void from_big(T big, T& native);
template <class T> inline void from_little(T little, T& native);
//----------------------------------- implementation -----------------------------------//
inline void flip(int16_t& x)
{
char* rep = reinterpret_cast<char*>(&x);
char tmp;
tmp = *rep;
*rep = *(rep+1);
*(rep+1) = tmp;
}
inline void flip(int32_t& x)
{
char* rep = reinterpret_cast<char*>(&x);
char tmp;
tmp = *rep;
*rep = *(rep+3);
*(rep+3) = tmp;
tmp = *(rep+1);
*(rep+1) = *(rep+2);
*(rep+2) = tmp;
}
inline void flip(int64_t& x)
{
char* rep = reinterpret_cast<char*>(&x);
char tmp;
tmp = *rep;
*rep = *(rep+7);
*(rep+7) = tmp;
tmp = *(rep+1);
*(rep+1) = *(rep+6);
*(rep+6) = tmp;
tmp = *(rep+2);
*(rep+2) = *(rep+5);
*(rep+5) = tmp;
tmp = *(rep+3);
*(rep+3) = *(rep+4);
*(rep+4) = tmp;
}
inline void flip(uint16_t& x)
{
char* rep = reinterpret_cast<char*>(&x);
char tmp;
tmp = *rep;
*rep = *(rep+1);
*(rep+1) = tmp;
}
inline void flip(uint32_t& x)
{
char* rep = reinterpret_cast<char*>(&x);
char tmp;
tmp = *rep;
*rep = *(rep+3);
*(rep+3) = tmp;
tmp = *(rep+1);
*(rep+1) = *(rep+2);
*(rep+2) = tmp;
}
inline void flip(uint64_t& x)
{
char* rep = reinterpret_cast<char*>(&x);
char tmp;
tmp = *rep;
*rep = *(rep+7);
*(rep+7) = tmp;
tmp = *(rep+1);
*(rep+1) = *(rep+6);
*(rep+6) = tmp;
tmp = *(rep+2);
*(rep+2) = *(rep+5);
*(rep+5) = tmp;
tmp = *(rep+3);
*(rep+3) = *(rep+4);
*(rep+4) = tmp;
}
inline void flip(int16_t source, int16_t& target)
{
const char* s (reinterpret_cast<const char*>(&source));
char * t (reinterpret_cast<char*>(&target) + sizeof(target) - 1);
*t = *s;
*++t = *++s;
}
inline void flip(int32_t source, int32_t& target)
{
const char* s (reinterpret_cast<const char*>(&source));
char * t (reinterpret_cast<char*>(&target) + sizeof(target) - 1);
*t = *s;
*++t = *++s;
*++t = *++s;
*++t = *++s;
}
inline void flip(int64_t source, int64_t& target)
{
const char* s (reinterpret_cast<const char*>(&source));
char * t (reinterpret_cast<char*>(&target) + sizeof(target) - 1);
*t = *s;
*++t = *++s;
*++t = *++s;
*++t = *++s;
*++t = *++s;
*++t = *++s;
*++t = *++s;
*++t = *++s;
}
inline void flip(uint16_t source, uint16_t& target)
{
const char* s (reinterpret_cast<const char*>(&source));
char * t (reinterpret_cast<char*>(&target) + sizeof(target) - 1);
*t = *s;
*++t = *++s;
}
inline void flip(uint32_t source, uint32_t& target)
{
const char* s (reinterpret_cast<const char*>(&source));
char * t (reinterpret_cast<char*>(&target) + sizeof(target) - 1);
*t = *s;
*++t = *++s;
*++t = *++s;
*++t = *++s;
}
inline void flip(uint64_t source, uint64_t& target)
{
const char* s (reinterpret_cast<const char*>(&source));
char * t (reinterpret_cast<char*>(&target) + sizeof(target) - 1);
*t = *s;
*++t = *++s;
*++t = *++s;
*++t = *++s;
*++t = *++s;
*++t = *++s;
*++t = *++s;
*++t = *++s;
}
} // namespace endian
} // namespace boost
#endif // BOOST_ENDIAN_CONVERSION_HPP