New cast between inet/cidr and bytea

Hi,

we at Cybertec have developed cast functions in C between
inet/cidr <-> bytea for a client and we would like to submit it.

This is how it works:
- IPv4 inet/cidr value will return 4 bytes if the netmask covers all 32 
bits. It returns 5 bytes if the netmask is shorter than 32 bits.
- Similarly for IPv6, 12[+1] bytes is returned.
- 4, 5, 12 or 13 bytes long bytea values are converted to an inet/cidr value, the 5th or 13th byte is range-checked to
bea valid netmask value.
 

What are the requirements for it to be accepted
as a core cast function or as a contrib module?

-- 
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Zoltán Böszörményi
Cybertec Geschwinde & Schönig GmbH
http://www.postgresql.at/