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From: Matthieu Wipliez <mwipliez@yahoo.fr>
To: caml-list <caml-list@yquem.inria.fr>
Subject: Re : [Caml-list] Re: Reading 16 bit floats from stream?
Date: Mon, 16 Oct 2006 20:32:04 +0000 (GMT)	[thread overview]
Message-ID: <20061016203204.13962.qmail@web27005.mail.ukl.yahoo.com> (raw)

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Hello,

what about converting each byte (represented by an int) to an int32, and then converting those using shifts and logical ors :

"in" being our in_channel:
let b0 = Int32.of_int (input_byte in)
let b1 = Int32.of_int (input_byte in)
let b2 = Int32.of_int (input_byte in)
let b3 = Int32.of_int (input_byte in)

let res = Int32.logor (Int32.logor (Int32.shift_left b0 24) (Int32.shift_left b1 16)) (Int32.logor (Int32.shift_left b2 8) (Int32.shift_left b3 0)).


Hope this helps,

Matthieu

----- Message d'origine ----
De : Maurizio Colucci <maurizio.colucci@gmail.com>
Cc : caml-list <caml-list@yquem.inria.fr>
Envoyé le : Lundi, 16 Octobre 2006, 19h06mn 46s
Objet : Re: [Caml-list] Re: Reading 16 bit floats from stream?



On 10/16/06, Gerd Stolpmann <info@gerd-stolpmann.de> wrote:
Am Montag, den 16.10.2006, 18:03 +0200 schrieb Maurizio Colucci:
>
>
> On 10/16/06, Maurizio Colucci <maurizio.colucci@gmail.com> wrote:
>         Hi,

>
>         I need to read a sequence of single precision floats (16 bits)
>         from a binary file. How can I do that?
>
> Sorry, I mean 32 bits. Single precision floats are 32 bits.


Well, have heard of even 8 bit floats...

32 bit floats can be read. First read the 4 bytes 
I assume you mean four read_bytes calls...



and make an int32 of
them. 
How do I create an int32 with four bytes? 



Then simply call Int32.float_of_bits.
I get this last one, but I can't imagine the previous step.

Thanks

Maurizio




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