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Re: New cast between inet/cidr and bytea

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Zoltan Boszormenyi <zb(at)cybertec(dot)at>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: New cast between inet/cidr and bytea
Date: 2007-05-30 19:01:57
Message-ID: 200705301901.l4UJ1vA24431@momjian.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Zoltan Boszormenyi wrote:
> 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 be a valid netmask value.
> 
> What are the requirements for it to be accepted
> as a core cast function or as a contrib module?

You discuss it on the hackers list.  Have you read the developer's FAQ? 
What is the use case for such a cast?

-- 
  Bruce Momjian  <bruce(at)momjian(dot)us>          http://momjian.us
  EnterpriseDB                               http://www.enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +

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