From: Joel VanderWerf <vjoel@...>
Date: 2005-08-26T12:53:29+09:00
Subject: Re: reading in C structs

Joe Van Dyk wrote:
> I have the following C struct:
> 
> typedef struct
> {
>    short   Elev;         /* vertex elevation */
>    u_char  Zone;         /* terrain fearture type */
>    u_char  Mono;         /* monochrome brightness value */
>    ulong   rgb;         /* rgb color components of vertex */
> 
> } cell_type
> 
> The rgb values are bitshifted into the rgb ulong, and then the rgb
> ulong is converted to a network long.
> 
> Then a bunch of those structs are written into a file.  
> 
> What's the Ruby way of getting the RGB values out?  Is the unpack
> specification "sccN"?  And then I'd unpack the network long with
> "cccc"?
> 

IIUC, just unpack "sC6", C for unsigned char.

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