From: Joel VanderWerf <vjoel@...>
Date: 2006-01-17T06:51:00+09:00
Subject: Re: DANGER ! Ruby-Newbie ahead: How to access binary files

ara.t.howard@noaa.gov wrote:

>         def bar
>           @mmap[@offset + Integer::SIZEOF, Float::SIZEOF].unpack("f").first
>         end
>         def bar= f
>           @mmap[@offset + Integer::SIZEOF, Float::SIZEOF] =
> [Float(f)].pack("f")
>         end

Doesn't this arithmetic assume that the C compiler is packing the fields
of the struct? What if fields are aligned on 8 byte boundaries, for
instance? I vaguely remember having some issues like this when porting
from x86 to sparc. I guess you could add __attribute__((__packed__)) to
the struct to be sure.

-- 
      vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407