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Dump.pl

by hsmyers (Canon)
on Oct 03, 2001 at 06:42 UTC ( #116337=sourcecode: print w/ replies, xml ) Need Help??

Category: Utility Scripts
Author/Contact Info hsmyers@sdragons.com
Description: Nothing fancy, just a straight forward binary dump of a file in a formatted display to either STDOUT or filename. Particularly handy to compare what you think is in the file with what is actually in the file!

hsm

#!/usr/bin/perl
# dump.pl -- create hex dump of input file.
use strict;
use warnings;
use diagnostics;
use Getopt::Std;
use Config;

my $filename = $ARGV[0];
my $output   = $ARGV[1];
my $buffer;
my $address = 0;
my $old_fh;

$0 =~ s|.*[/\\]||;
my $usage = <<EOT;
Usage:  $0 [-h]
   or:  $0 file_in [file_out]
EOT

my %OPT = ();
warn($usage), exit(0) if !getopts( 'h', \%OPT ) or $OPT{'h'};
if ($output) {
    open( OUT, "> $output" ) || die "Couldn't open $output for output:
+ $!\n";
    $old_fh = select(OUT);
}
die "No filename specified\n" unless ($filename);
open( FILE, $filename ) || die "Couldn't open $filename: $!\n";
binmode FILE;

while ( read( FILE, $buffer, 16 ) ) {
    printf( "%08x: %s | %-16s\n", $address, hexstr($buffer),
      makesafe($buffer) );
    $address += 16;
}
close(FILE);

if ($output) {
    select($old_fh) if ($output);
    close(OUT);
}

sub makesafe {
    my @list = unpack( 'C*', $_[0] );
    foreach (@list) {
        if ( $_ < 32 || $_ > 126 ) {
            $_ = 46;
        }
    }
    my $result = pack( 'C*', @list );
    return $result;
}

sub hexstr {
    my @list = unpack( 'H32', $_[0] );
    my $result = sprintf( "%-32s", $list[0] );
    my $expanded;

    while ( $result =~ /(..)/g ) {
        $expanded .= $1 . ' ';
    }
    return $expanded;
}

=pod
=head1 NAME

dump - output a formated hex dump of a selected file

=head1 SYNOPSIS

B<dump> B<-h>

B<dump> filename

B<dump> file_in file_out

=head1 DESCRIPTION

This utility converts a file into the formated hexidecimal representat
+ion of itself.
Output is to either STDOUT or to a specified file.

=head1 EXAMPLES

    C:\dump dump.pl
    creates:
        00000000: 23 21 2f 75 73 72 2f 62 69 6e 2f 70 65 72 6c 20  | #
+!/usr/bin/perl 
        00000010: 2d 77 0a 23 20 64 75 6d 70 2e 70 6c 20 2d 2d 20  | -
+w.# dump.pl -- 
        00000020: 63 72 65 61 74 65 20 68 65 78 20 64 75 6d 70 20  | c
+reate hex dump 
        00000030: 6f 66 20 69 6e 70 75 74 20 66 69 6c 65 2e 0a 0a  | o
+f input file...
        00000040: 75 73 65 20 73 74 72 69 63 74 3b 0a 75 73 65 20  | u
+se strict;.use 
        00000050: 77 61 72 6e 69 6e 67 73 3b 0a 0a 6d 79 20 24 66  | w
+arnings;..my $f
        .
        .
        .
        00000390: 64 65 64 20 2e 3d 20 24 31 2e 27 20 27 3b 0a 09  | d
+ed .= $1.' ';..
        000003a0: 7d 0a 09 72 65 74 75 72 6e 20 24 65 78 70 61 6e  | }
+..return $expan
        000003b0: 64 65 64 3b 0a 7d                                | d
+ed;.}          
    

    C:\dump dump.pl out.txt
    creates: the file out.txt as above...

    C:\dump -h
    shows: command line usage

=head1 SEE ALSO

coredump, divination, entrails

=head1 BUGS

    C:\dump filename > outfile
    won't work if this is made a dos batch file...

=head1 AUTHOR

Hugh S. Myers
hsmyers@sdragons.com

=cut
__END__

Comment on Dump.pl
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Re: Dump.pl
by premchai21 (Curate) on Oct 04, 2001 at 04:40 UTC

    Just thought you might want to know that the two big Emacsen (FSFEmacs and XEmacs) come with hexl, which does exactly this. hexl is also used for hexl-mode, which allows one to edit files in this form.

    Update in response to hsmyers's reply: You don't need to use Emacs itself to use hexl. It's a separate executable that takes ARGV and hexlifies it to STDOUT.

      Knew that, but this is handier— at least to the way I work. Love emacs, but see no reason to live in it!

      hsm

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