Q: How do I convert between big-endian and little-endian values?
A: The operations are the same in both directions. Here is some code for the common unsigned data types:
Code:
inline void endian_swap(unsigned short& x)
{
x = (x>>8) |
(x<<8);
}
inline void endian_swap(unsigned int& x)
{
x = (x>>24) |
((x<<8) & 0x00FF0000) |
((x>>8) & 0x0000FF00) |
(x<<24);
}
// __int64 for MSVC, "long long" for gcc
inline void endian_swap(unsigned __int64& x)
{
x = (x>>56) |
((x<<40) & 0x00FF000000000000) |
((x<<24) & 0x0000FF0000000000) |
((x<<8) & 0x000000FF00000000) |
((x>>8) & 0x00000000FF000000) |
((x>>24) & 0x0000000000FF0000) |
((x>>40) & 0x000000000000FF00) |
(x<<56);
}