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

From: Dwight K. Elvey <dwight.elvey_at_amd.com>
Date: Sat Jul 31 16:00:45 2004

>From: "Stephane Tsacas" <stephane.tsacas_at_gmail.com>
>
>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.

Hi Stephane
 Now you got it.
Dwight

>
>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 - 16:00:45 BST