POV-Ray : Newsgroups : povray.advanced-users : write uint32_t : Re: write uint32_t Server Time
18 Oct 2021 13:37:35 EDT (-0400)
  Re: write uint32_t  
From: Tor Olav Kristensen
Date: 30 Mar 2021 09:15:00
Message: <web.6063231a8cf934b8ae6f04a89db30a9@news.povray.org>
ingo <ing### [at] tagpovrayorg> wrote:
> in news:60620b36$1@news.povray.org Thorsten wrote:
>
> > You can just compute the two's complement inverse before output, and
> > you get what you want
> >
>
> Sorry Thorsten, I realy don't understand. Can we do it by example.
> I have a number, 4321 and it hast to written to a file as uint_32.

Here's how you can do it with sint32le and sint32be. This does it like Thorsten
indicated in his last post.


#version 3.7;

// #declare UnsignedInteger = 0; // 0x00000000
// #declare UnsignedInteger = 1; // 0x00000001
// #declare UnsignedInteger = pow(2, 31) - 1; // 0x7FFFFFFF
// #declare UnsignedInteger = pow(2, 31); // 0x80000000
// #declare UnsignedInteger = pow(2, 31) + 1; // 0x80000001
// #declare UnsignedInteger = pow(2, 32) - 1; // 0xFFFFFFFF

#declare UnsignedInteger = 4321; // 0x000010E1
// #declare UnsignedInteger = 1059986700; // 0x3F2E1D0C
// #declare UnsignedInteger = 4091728320; // 0xF3E2D1C0

#if (UnsignedInteger < pow(2, 31))
    #declare N = UnsignedInteger;
#else
    #declare N = UnsignedInteger - pow(2, 32);
#end // if

#debug concat("\n\n", str(N, 0, 0), "\n\n")

#fopen SomeFile "LitteEndian32.bin" write
#write (SomeFile, sint32le N)
#fclose SomeFile

#fopen SomeFile "BigEndian32.bin" write
#write (SomeFile, sint32be N)
#fclose SomeFile

#error "Finished"


--
Tor Olav
http://subcube.com
https://github.com/t-o-k


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