reading binary data to structure

When I've read in some bytes from a binary file
using:

let fd = Unix.openfile "some.bin" mode 0o644;;
let str = String.create 53;;
let n = Unix.read fd str 0 53;;

how do I map the content (binary) of 'str' into a data structure of
e.g. the following type:

type entry = {
a : int;
b : int;
c : int;
d : int list;
}

thank you
jonathan heusser

--
Key fingerprint = 2A55 EB7C B7EA 6336 7767 4A47 910A 307B 1333 BD6C

On Mon, 14 Jul 2003, Jonathan Heusser wrote:

> how do I map the content (binary) of 'str' into a data structure of
> e.g. the following type:

The problem is severely underconstrained as you state it...

Since the code doesn't look like standard ML to me I guess it must be
OCaml.

Do you know how to get a character at a specific index in a string?

Do you know how to get the ordinal value of a character (i.e. turn a
character into an integer)?

If you know how to do that the rest becomes a small matter of programming
-- and of finding out what the problem /really/ is:

- how many characters per integer?
- what is the byte order?
- is there a count of the number of integers in d?
- or is there a fixed number?
- or are they terminated by a sentinel?

.... there are /many/ other variants if you really want to be perverse.

-Peter