#!/usr/bin/perl -w

use Cwd;
use warnings;
use strict;
use Getopt::Long;
use Switch;

use constant FILEHDR => 4;
use constant CDRLEN  => 286;

my ($trace, $help, $infile);
my $swap = '';
my $indir  = getcwd;
my $outdir = getcwd;

GetOptions (
	"h|help"	=> \$help,
	"filename|f=s"	=> \$infile,
	"swap|s"	=> \$swap,
	"input|i=s"	=> \$indir,
	"output|o=s"	=> \$outdir,
	"trace|t"	=> \$trace
) or usage();


sub usage {
	exit;
}

my @tt = ("Flags", "Record Seq.", "LAC Length", "Directory No", "Others");
my @dtf = ("Year","Month","Day","Hour","Minute","Second", "Reserved","Duration");

my $outfile = $infile;
my $data;
my $i;

sub inttohex {
	my $int = shift;

	return sprintf ("%02X", $int);
}

sub hextoint {
	my $hex = shift;

	return sprintf ("%d", hex($hex));
}

## Convert each ASCII character to a two-digit hex number.
sub asctohex ()
{
    	(my $hex = shift) =~ s/(.|\n)/sprintf("%02lx", ord $1)/eg;
    	return $hex;
}

# Convert each two-digit hex number back to an ASCII character.
sub hextoasc 
{
    	(my $asc = shift) =~ s/([a-fA-F0-9]{2})/chr(hex $1)/eg;
	return $asc;
}

sub strtoasc {
	my $str = shift;
	my $asc = "";
	my $loc = 0;
	my $i;

	for ($i = 0; $i < length($str); $i+=2) {
		$asc = $asc . hextoasc(substr($str, $loc, 2));
		$loc = $loc + 2;
	}

	return $asc;
}

my ($partnerdir_no);

if ($infile) {
	#open (OUTPUT, ">$outdir/$outfile");
	open (DATA, "$indir/$infile");
	binmode DATA;
	
	my @rec;

	until (eof DATA) {
		read (DATA, $data, 2);
		my $tag    = unpack "H2", substr $data,0,1,'';
		my $length = unpack "C", substr $data,0,1,'';
		$length -= 2;

		if ($length == "81") {
			$length = unpack "C", substr $data,0,1,'';
			$length -= 1;
		}
		my $loc = 0;

		while (read (DATA, $data, $length)) {
			my @header = unpack "H6 H2 H2 H12", substr $data,0,11,'';

			if ($trace) {
				printf ("%-20s : %-5s >%s<\n", "TAG" , $tag, inttohex($tag));
				printf ("%-20s : %-5s >%s<\n", "RECORD LENGTH", $length+2, inttohex($length+2));
				printf ("HEADER\n");
				for ($i=0; $i<@header; $i++) {
					printf (" |- %-16s : %s\n", $tt[$i],$header[$i]);
				}
			}

			printf ("\nDATA PACKAGE\n");
			while ($data) {
				$tag = unpack "C", substr $data,$loc,1,'';
				printf ("%-20s : %-5s >%s<\n", "TAG", $tag, inttohex($tag));

				switch ($tag) {
					# x64 - length fix 11 bytes
					case 100 { @rec = unpack "C C C C C C C C3", substr $data,0,10; 
					   	printf " |- DateTime/Duration\n";
					   	for (my $i=0; $i<8; $i++) {
						   	printf "   |- %-20s : %02s >%s<\n", $dtf[$i], $rec[$i], inttohex($rec[$i]);
				   	   	}
			   		}
					# x65 
					case 101 { my $length = unpack "C", substr $data,0,1,'';
					   	$length += 1;

					   	if ($length == "81") {
							$length = unpack "C", substr $data,0,1,'';
							$length += 1;
					  	}
					  	$partnerdir_no = unpack "H*", substr $data,0,$length;
					  	printf ("PARTNER DIRECTORY NO. : %s\n", $partnerdir_no);
					}
				}
			}	
		}
	}

	close(DATA);
	#close(OUTPUT);
}