MathGem:Endian Operations
These functions deal with converting endianness. For more information on endianess, take a look at Wikipedia's article on Endianness.
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Convert a WORD
This macro will flip the bytes within a WORD (2 Byte) value to convert between little endian and big endian format.
C/C++
You can also use htons() and ntohs() to convert between host and network byte order. On Linux these functions can be found in netinet/in.h and on Windows they are a part of Winsock2 and can be found in Winsock2.h.
- define FlipWord(w) ( (w)<<8 | (w)>>8 )
Python
You can also use htons() and ntohs() to convert between host and network byte order. These functions are found in the socket module.
def FlipWord(w):
return ((w << 8) & 0x0FF00) | (w >> 8)
Convert a DWORD
This macro will flip the bytes within a DWORD (4 byte) value to convert between little endian and big endian format.
C/C++
You can also use htonl() and ntohl() to convert between host and network byte order. On Linux these functions can be found in netinet/in.h and on Windows they are a part of Winsock2 and can be found in Winsock2.h.
- define FlipDword(d) ((d)<<24 | (((d)<<8) & 0x00FF0000) | (((d)>>8) & 0x0000FF00) | (d)>>24)
Python
You can also use htonl() and ntohl() to convert between host and network byte order. These functions are found in the socket module.
def FlipDword(d):
return (((d)<<24) & 0xFF000000) | (((d)<<8) & 0x00FF0000) | (((d)>>8) & 0x0000FF00) | (d)>>24)
