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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. =20

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"?

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.

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