#!/usr/bin/perl
# 
# Copyright © 2015-2020 by Vincent Slyngstad
# 
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
# 
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS LISTED ABOVE BE LIABLE
# FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
# CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
# 
# Except as contained in this notice, the names of the authors above
# shall not be used in advertising or otherwise to promote the sale, use
# or other dealings in this Software without prior written authorization
# from those authors.

# Dump the media in octal and sixbit.

# Pick a block size (in words!)
$bsize = 128;
$upack = "S$bsize";

# Open the file
open(INPUT, $ARGV[0]) || die "$ARGV[0]: $!";
binmode(INPUT);

#
# Read each block and print it.
for ($block = 0; ; $block++) {
    seek(INPUT, $block*2*$bsize, 0) || die "$ARGV[0] file seek: $!";
#   read(INPUT, $buf, 2*$bsize) || die "$ARGV[0] file read: $!";
    read(INPUT, $buf, 2*$bsize) || last;
    @buf = unpack($upack, $buf);
    $sixbit = "";
    for ($offset = 0; $offset < $bsize; $offset++) {
        if ($offset%8 == 0) {
            printf "%s\r\n%04o %03o)", $sixbit, $block, $offset;
            $sixbit = "";
        }
        printf "%04o ", $buf[$offset];
   	@c = ($buf[$offset]>>6, $buf[$offset]&077);
    	grep($_ = ($_ >= 040? $_ : $_ + 0100), @c);
    	$sixbit .= pack('CC', @c);
    }
    printf "%s\r\n", $sixbit;
}