OT-ish - converting hex output to binary on a Unix platform

From: Stephane Tsacas <stephane.tsacas_at_gmail.com>
Date: Sat Jul 31 06:49:34 2004

ahhhhh okay :)
You mean if you have 23 as input (2 digits/ascii code of 2 and 3) the
output should be the binary value 0x23 in one byte. Correct ?
So input is ascii and output is a binary file, not ascii.

awk --non-decimal-data 'BEGIN {RS=" "} {x="0x"$0; printf("%c", 0+x);}' |
od -t x1
0 1 2 3 4 5 6 7 8 9 A B C D E F 10 11 1F 20 FA FB FC FD FE FF
0000000 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f
0000020 10 11 1f 20 fa fb fc fd fe ff
0000032

I use 'od' to do the binary to ascii conversion so I can print the
result. But you can also redirect the output in a file and load it in
emacs (in hexl-mode) to double check.
Massaging of the value can be done before the printf as in :
awk --non-decimal-data 'BEGIN {RS=" "} {x=$0; x++; x="0x"x;
printf("%c", 0+x);}'|od -t x1
1 2 3
0000000 02 03 04

/s
On Fri, 30 Jul 2004 19:40:51 -0700 (PDT), Dwight K. Elvey
<dwight.elvey_at_amd.com> wrote:
>
> >Date: Sat, 31 Jul 2004 04:16:09 +0200
> >From: "Stephane Tsacas" <stephane.tsacas_at_gmail.com>
> >To: "Dwight K. Elvey" <dwight.elvey_at_amd.com>, "General Discussion: On-Topic and
> Off-Topic Posts" <cctalk_at_classiccmp.org>
> >Subject: Re: OT-ish - converting hex output to binary on a Unix platform
> >
> >awk --non-decimal-data 'BEGIN {RS=" "} {x="0x"$0; printf("%d ", x)}'
> >0 1 2 3 4 5 6 7 8 9 A B C D E F 10 11 12 1F 20 FC FD FE FF
> >0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 31 32 252 253 254 255
> >
> >better ?
>
> Hi
> I think your still missing the point. Your printout is
> all in ascii. If things were working as expected the
> number '31' hex would display as '1' when printed. Many hex
> numbers would not even display. It looks like the variable
> is now correct but you need to write it as the byte value
> to a file not convert it to the decimal printed
> as ascii digits. 255 is the binary values that are 00110010
> 00110101 00110101. This is 3 values not the one value 11111111.
> I think you are still confusing the byte with the displayed
> value.
> Am I making sense?
> Dwight
>
>
>
> >
> >On Fri, 30 Jul 2004 18:26:12 -0700 (PDT), Dwight K. Elvey
> ><dwight.elvey_at_amd.com>
> >wrote:
> >...
> >> I'm not sure this is what he is looking for. I think
> >> he wants the hex number converted to a byte value
> >> not just printed in ascii as a binary value.
> >> Dwight
> >>
> >>
> >
>
>
Received on Sat Jul 31 2004 - 06:49:34 BST