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How to convert a binary file to Hex string? (Perl)

Posted on 2010-08-24
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Last Modified: 2012-05-10
Experts,

how do I convert a binary file to a hex string in Perl?

not-so-working example:

      open(BS_FILE, $bs_file_bin)  or die "can't open $bs_file_bin: $!";
      
      binmode(BS_FILE);
      
      @lines = <BS_FILE>;
      for $line ( @lines ) {
            chomp $line;
         my $int = unpack("N", pack("B32", substr("0" x 32 . $line, -32)));
            my $hex = sprintf("%x", $int );

            print STDOUT "$hex\n";

      }
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Question by:php-newbie
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3 Comments
 
LVL 10

Accepted Solution

by:
jeromee earned 500 total points
ID: 33516141
I think the issue is that you are mixing <BS_FILE> with binmode.
Try this... it seems to work for me.
use strict;

my $bs_file_bin = "/tmp/bf";

open(BS_FILE, $bs_file_bin)  or die "can't open $bs_file_bin: $!";
binmode(BS_FILE);

my $data;
while( read(BS_FILE, $data, 4) ) {
   my $int = unpack("N", $data);
   my $hex = sprintf("%08X", $int );
   print STDOUT "$hex\n";
}

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LVL 84

Expert Comment

by:ozo
ID: 33516730
or
perl -lne 'BEGIN{$/=\4}print unpack"H*"' /tmp/bf
0
 

Author Closing Comment

by:php-newbie
ID: 33517034
very awesome!!! Thanks!
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