Converting hex to ascii/decimal


 
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# 1  
Old 03-31-2011
Converting hex to ascii/decimal

I am writing a bash script to do some parsing on a log and I am running into a problem when it comes to converting only certain sections of the file from hex to ascii or hex to decimal.

Data Example:

Quote:
------------
ip = 10.2.3.4
------------
Hardware= [ 38 30 30 30 ]
Errors= [ 00 a1 ]
Full= [ 63 ]
SW Version= [ 31 2e 38 2e 31 2e 31 30 39 ]
Test= [ 76 ]
------------
ip = 10.2.3.8
------------
Hardware= [ 34 30 30 30 ]
Errors= [ 00 a1 ]
Full= [ 45 ]
SW Version= [ 31 2e 38 2e 31 2e 31 30 39 ]
Test= [ 76 ]
The hex values after Hardware and SW Version I need to convert from Hex to ASCII and the Errors, Full, Test values I need to convert from hex to decimal.

The output should look like the following:

Quote:
------------
ip = 10.2.3.4
------------
Hardware= [ 8000 ]
Errors= [ 161 ]
Full= [ 99 ]
SW Version= [ 1.8.1.109]
Test= [ 118 ]
------------
ip = 10.2.3.8
------------
Hardware= [ 4000]
Errors= [ 161 ]
Full= [ 69 ]
SW Version= [ 1.8.1.109 ]
Test= [ 118 ]
Thanks for any help!
# 2  
Old 03-31-2011
Code:
$
$ cat xverter
#! /usr/bin/bash

# convert from hex to ascii
sample=" 38 30 30 30"
sample=${sample// /\\x}
sample="$sample\\n"
printf "$sample"

#
# convert from base 16 to base 10

hex=76
((dec=0X$hex))
echo $dec

exit 0
$
$
$ ./xverter
8000
118
$

This User Gave Thanks to Perderabo For This Post:
# 3  
Old 03-31-2011
Thanks , but how would I go about searching for the line and then converting whatever is in between the brackets because its not going to be the same values every time.

Perhaps id have to search for Hardware and then take whatever is in between the brackets set as a variable and then use the above code for the conversion?
# 4  
Old 03-31-2011
Quote:
Originally Posted by Shiftkey
Perhaps id have to search for Hardware and then take whatever is in between the brackets set as a variable and then use the above code for the conversion?
Exactly. And you will need to ensure that you have exactly one space before each hex value for the hex to ascii conversion. And no spaces at all for the hex to decimal conversion.
# 5  
Old 03-31-2011
Ruby(1.9+)
Code:
#!/usr/bin/env ruby 
File.open("file").each do|line|
    if line =~ /^(SW|Hardware)|Error|Test|Full/i
        toconv = line.scan(/\[(.*?)\]/)[0][0]
        if line =~ /SW|Hardware/
            toconv = toconv.split.map{|x|x.hex.chr}.join
        else
            toconv = toconv.split.map{|x|x.hex}.join
        end
        line.gsub!( /(.*\[)(.*)(\].*)/ , "\\1#{toconv}\\3" )
    end
    puts line
end

Test run:
Code:
$ ruby myconvert.rb
------------
ip = 10.2.3.4
------------
Hardware= [8000]
Errors= [0161]
Full= [99]
SW Version= [1.8.1.109]
Test= [118]
------------
ip = 10.2.3.8
------------
Hardware= [4000]
Errors= [0161]
Full= [69]
SW Version= [1.8.1.109]
Test= [118]

# 6  
Old 03-31-2011
A bit verbose, but......
nawk -f shift.awk myFile

shift.awk:
Code:
BEGIN {
  FS="([[]|[]])"
}
function hex2dec(h,  i,x,v){
  h=tolower(h);sub(/^0x/,"",h)
  for(i=1;i<=length(h);++i){
    x=index("0123456789abcdef",substr(h,i,1))
    v=(16*v)+x-1
  }
  return v
}

function hex2str(h) {
  printf("%c", hex2dec(h))
}
/^(--|ip)/ {print; next}

/^(Hardware|SW Version)=/ {
  printf("%s",$1 "[")
  n=split($2, vA,OFS)
  for(i=1;i<=n;i++)
     printf("%c%s", hex2str(vA[i]), (i==n)? "]"ORS:"")
  next
}
{
  printf("%s",$1 "[")
  n=split($2, vA,OFS)
  for(i=1;i<=n;i++)
     printf("%d%s", hex2dec(vA[i]), (i==n)? "]"ORS:"")
}

This User Gave Thanks to vgersh99 For This Post:
# 7  
Old 03-31-2011
Thanks but I dont have ruby installed so I cant test that code out.

trying to finish it up with awk and sed atm, will post if I can get it working.

---------- Post updated at 10:38 AM ---------- Previous update was at 09:57 AM ----------

Awesome vgersh99! I tweaked a few things to match my actual log file and it works perfectly.

Im not to familiar with using awk with bash scripts though, how do I go about combining that piece of awk code with the rest of my bash script? I keep getting errors when I put awk inside the script.
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