From: nobu@...
Date: 2006-07-15T00:15:02+09:00
Subject: Re: How to pack/unpack nested structures?

Hi,

At Thu, 13 Jul 2006 00:31:37 +0900,
Justin Bailey wrote in [ruby-talk:201532]:
>   version = 1
>   numBuffers = 1
> 
>   bufferSize = 100
>   bufferType = 2
>   buffer = "\0" * bufferSize

I guess this buffer is the answer, unless the function returns
another pointer.

>   struct = [version, numBuffers, [bufferSize, bufferType,
> buffer].pack("LLP")].pack("LLP")

or:

  nested_struct = [bufferSize, bufferType, buffer].pack("LLP")
  struct = [version, numBuffers, inner_struct].pack("LLP")

  nested_struct.unpack("LLP12")

If the function alters buffer of struct SecurityBuffer, says it
allocates new buffer and returns it, unpack can't deal with it.
You need DL instead.

-- 
Nobu Nakada