Re: how to add pad byte

From	goran.pusic@gmail.com
Newsgroups	comp.lang.c++
Subject	Re: how to add pad byte
Date	2012-03-30 06:40 -0700
Organization	http://groups.google.com
Message-ID	<14818156.4371.1333114842374.JavaMail.geo-discussion-forums@vbhv6> (permalink)
References	<12a32df5-3958-4a20-b6cf-eb6f3ddacd3e@l7g2000vbw.googlegroups.com>

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On Sunday, March 25, 2012 11:49:17 AM UTC+2, Cplusplus Programmer wrote:
> Hello all,
> 
> Suppose I need to store the binary notation of an integer value into a
> char and later write it to a binary file.
> However I do not know beforehand the value. So I would like to reserve
> say n (with n =5) bytes for that integer. It may sound odd, however
> the type of file I am going to write represents an integer in a
> variable number of bytes. In this way we can store any integer value
> as large we want. So, I don't know the value I am going to store, but
> I have an upper limit and thus I reserve 5 bytes for it. But now when
> I know the value, I discover I only need 3 bytes. Now I have to add 2
> pad bytes. Can someone explain to me how to add pad bytes ? Is this
> binary notation 0000 a pad byte ? So if I had char[2] = 0; then
> char[2] is a pad byte ?

What "pad" is depends on the file format. Depending on the situation, padding might be octet 0, or '0', or ' '. You need to find out, from the definition of file format, what the pad is.

The rest of your question is trivial: reserve space, fill "useful" part with your number, fill the rest with padding.

Goran.

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how to add pad byte Cplusplus Programmer <cplusplusprogrammer73@gmail.com> - 2012-03-25 02:49 -0700
  Re: how to add pad byte Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-03-25 11:40 +0000
    Re: how to add pad byte Cplusplus Programmer <cplusplusprogrammer73@gmail.com> - 2012-03-25 10:00 -0700
      Re: how to add pad byte scott@slp53.sl.home (Scott Lurndal) - 2012-03-25 17:58 +0000
        Re: how to add pad byte Cplusplus Programmer <cplusplusprogrammer73@gmail.com> - 2012-03-25 11:41 -0700
          Re: how to add pad byte Richard Damon <news.x.richarddamon@xoxy.net> - 2012-03-25 14:51 -0400
            Re: how to add pad byte Cplusplus Programmer <cplusplusprogrammer73@gmail.com> - 2012-03-25 13:44 -0700
              Re: how to add pad byte Cplusplus Programmer <cplusplusprogrammer73@gmail.com> - 2012-03-25 13:46 -0700
              Re: how to add pad byte Richard Damon <news.x.richarddamon@xoxy.net> - 2012-03-25 19:25 -0400
      Re: how to add pad byte Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-03-25 19:49 +0000
      Re: how to add pad byte "Fred Zwarts \(KVI\)" <F.Zwarts@KVI.nl> - 2012-03-26 10:05 +0200
      Re: how to add pad byte jgk@panix.com (Joe keane) - 2012-03-29 23:05 +0000
  Re: how to add pad byte goran.pusic@gmail.com - 2012-03-30 06:40 -0700

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