/ 
Data-Hexdumper-1.4
River stage one • 7 direct dependents • 7 total dependents
/ Data::Hexdumper

NAME

Data::Hexdumper - Make binary data human-readable

SYNOPSIS

use Data::Hexdumper qw(hexdump);
$results = hexdump(
    data           => $data, # what to dump
    number_format  => 'S',   # display as unsigned 'shorts'
    start_position => 100,   # start at this offset ...
    end_position   => 148    # ... and end at this offset
);
print $results;

DESCRIPTION

Data::Hexdumper provides a simple way to format arbitary binary data into a nice human-readable format, somewhat similar to the Unix 'hexdump' utility.

It gives the programmer a considerable degree of flexibility in how the data is formatted, with sensible defaults. It is envisaged that it will primarily be of use for those wrestling alligators in the swamp of binary file formats, which is why it was written in the first place.

SUBROUTINES

The following subroutines are exported by default, although this is deprecated and will be removed in some future version. Please pretend that you need to ask the module to export them to you.

If you do assume that the module will always export them, then you may also assume that your code will break at some point after 1 Aug 2012.

hexdump

Does everything. Takes a hash of parameters, one of which is mandatory, the rest having sensible defaults if not specified. Available parameters are:

data

A scalar containing the binary data we're interested in. This is mandatory.

start_position

An integer telling us where in data to start dumping. Defaults to the beginning of data.

end_position

An integer telling us where in data to stop dumping. Defaults to the end of data.

number_format

A character specifying how to format the data. This tells us whether the data consists of bytes, shorts (16-bit values), longs (32-bit values), and whether they are big- or little-endian. The permissible values are C, S, n, v, L, N, and V, having exactly the same meanings as they do in unpack. It defaults to 'C'.

suppress_warnings

Make this true if you want to suppress any warnings - such as that your data may have been padded with NULLs if it didn't exactly fit into an integer number of words, or if you do something that is deprecated.

space_as_space

Make this true if you want spaces (ASCII character 0x20) to be printed as spaces Otherwise, spaces will be printed as full stops / periods (ASCII 0x2E).

Hexdump - this function has now been removed

The 'Hexdump' function (note the different capitalisation) was deprecated in version 1.0.1, and was removed in version 1.3 five years later.

SEE ALSO

Data::Dumper

Data::HexDump if your needs are simple

perldoc -f unpack

perldoc -f pack

BUGS/LIMITATIONS

There is no support for syntax like 'S!' like what pack() has, so it's not possible to tell it to use your environment's native word-lengths. Only 16- and 32-bit shorts and longs are supported. There is no support for 64-bit datatypes.

It formats the data for an 80 column screen, perhaps this should be a frobbable parameter.

Formatting may break if the end position has an address greater than 65535.

FEEDBACK

I welcome constructive criticism and bug reports. Please report bugs either by email or via RT: http://rt.cpan.org/Public/Dist/Display.html?Name=Data-Hexdumper

The best bug reports contain a test file that fails with the code that is currently in CVS, and will pass once it has been fixed. The CVS repository is on Sourceforge and can be viewed in a web browser here: http://drhyde.cvs.sourceforge.net/drhyde/perlmodules/Data-Hexdumper/

AUTHOR, COPYRIGHT and LICENCE

This software is copyright 2001 - 2007 David Cantrell (david@cantrell.org.uk).

You may use, modify and distribute this software under the same terms as you may perl itself.

THANKS TO ...

MHX, for reporting a bug when dumping a single byte of data

Stefan Siegl, for reporting a bug when dumping an ASCII 0