The format of an internet addresses block is:
Offset Contents
0 Size of block in bytes
1 Address family
2 Port number
4 IPv4 address
8 Reserved (should be zero)
12 Reserved (should be zero)
Note: Port and IP address should be in network byte order - also known as 'big endian' - the reverse of the format used by the ARM processor on RISC OS machines.
The internet form of an address is (in C):
struct sockaddr_in {
unsigned char sin_len; /* length of this structure */
unsigned char sin_family; /* address family (AF_INET) */
unsigned short sin_port; /* port number */
struct in_addr sin_addr; /* internet address (sin_addr.s_addr) */
char sin_zero[8]; /* zero padding */
};
This address format was introduced with Internet 5.00 and should be used in preference to the obsolete sockaddr used by Internet 4.xx.
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