#

# All rights reserved.

# This component and the accompanying materials are made available

# under the terms of the License "Eclipse Public License v1.0"

# which accompanies this distribution, and is available

# at the URL "http://www.eclipse.org/legal/epl-v10.html".

#

# Initial Contributors:

# Nokia Corporation - initial contribution.

#

# Contributors:

#

# Description: 

#

#!/bin/perl

use strict;

use Getopt::Long;

my $DEBUG = 0;

my $TABS = "";

my $OUTPUT_BUFFER = "";

main();

exit;

sub main() {

	my $out;

	my $outFh;

	my $in;	

	my @lines;

	GetOptions('debug=i' => \$DEBUG,

			   'in=s' => \$in,

			   'out=s' => \$out);

	if (! defined $in && defined $ARGV[0]) {

		$in = $ARGV[0];

	}

	if (defined $in) {

		@lines = decompile($in);

	}

	else {

		die "No input file specified.\n";

	}

	if (! defined $out && defined $ARGV[1]) {

		$out = $ARGV[1];

	}

	if (defined $out) {

		open $outFh, ">$out" || die "Cannot open output file $out";

	}

	else {

		$outFh = *STDOUT;

	}

	translate(\@lines);

	print $outFh $OUTPUT_BUFFER; 

}

sub translate($) {

	my ($lines) = @_;

	my $lineCount = scalar(@$lines);

	for (my $i = 0; $i < $lineCount; ++$i) {

		$_ = @$lines[$i];

		s/^\s*//g;

		s/\n//g;

		if ($DEBUG >= 3) {

			print "$_\n";

		}

		if ( /^OBJECT\s+IDENTIFIER\s*$/ ) {

			if ($DEBUG >= 3) {

				print "reading OID value from next line\n";

			}

			if (defined @$lines[$i+1]) {

				$_ .= @$lines[++$i];

			}

		}

		if ( /BIT\s+STRING,\s+encapsulates/i ) {

			addToOutput("BITSTRING_WRAPPER");

			nest();

		}

		elsif ( /^\s*BIT\s+STRING/i ) {

			# bitstring defined in binary

			if ( $$lines[$i+1] =~ /\'([01]+)\'/ ) {

				$i++;

				addToOutput("BITSTRING=$1");

			}

			# bit string defined in hex

			elsif ( /^\s*BIT\s+STRING\s+(([A-F0-9][A-F0-9]\s*)+)/i ) {

				my $bitStr = toBitString($1);

				addToOutput("BITSTRING=$bitStr");

			}

			else {

			# bit string wrapper

				addToOutput("BITSTRING_WRAPPER");

				nest();

				addToOutput("RAW \{");

				nest();

				$i++;

				addToOutput(getRawHex($lines,\$i));

				leaveNest();

				addToOutput(" \}");

				leaveNest();

				addToOutput("END");								

			}

		}

		elsif ( /^(BMPSTRING\s+)\'(.*)\'/i ) {

			addToOutput("BMPSTRING=$2");

		}

		elsif ( /^(BOOLEAN\s+)(.*)/i ) {

			addToOutput("BOOLEAN=$2");

		}

		elsif ( /(^ENUMERATED\s+)(\d+)*$/i ) {

			# small integer - non hex incoded

			addToOutput("ENUMERATED=$2");

		}

		elsif ( /^\[(\d+)\]\s*\'(.*)\'/ ) { 

			addToOutput("IMPLICIT=$1");

			nest();

			addToOutput("PRINTABLESTRING=$2");

			leaveNest();

			addToOutput("END");

		}

		elsif ( /^\[(\d+)\]/ ) {

			# general case for implicit & explicit tags

			my $tag=$1;

			if (defined @$lines[$i+1] && isRawData(@$lines[$i+1])) {

				# if there is only raw data assume implicit

				addToOutput("IMPLICIT=$tag");				

				nest();

				addToOutput("OCTETSTRING");

				nest();

				addToOutput("RAW \{");

				while (isRawData(@$lines[++$i])) {

					addToOutput("" . @$lines[$i] . "");

				}

				--$i;

				addToOutput("\}");

				leaveNest();

				addToOutput("END");

				leaveNest();

				addToOutput("END");

				leaveNest();

			}

			else {

				# otherwise assume explicit

				addToOutput("EXPLICIT=$tag");

			}

			nest();

		}			

		elsif ( /^(IA5STRING\s+)\'(.*)\'/i ) {

			addToOutput("IA5STRING=$2");

		}

		elsif ( /(^INTEGER\s+)(\d+)*$/i ) {

			# small integer - non hex incoded

			addToOutput("INTEGER=$2");

		}

		elsif (/^INTEGER/) {

			# big integer

			addToOutput("BIGINTEGER {");

			my $tmp = $_;

			$tmp =~ s/.*INTEGER\s+//g;

			nest();

			if (isRawData($tmp)) {

				addToOutput($tmp);

			}

			$i++;

			addToOutput(getRawHex($lines,\$i));

			leaveNest();

			addToOutput("\}");

		}

		elsif ( /^NULL/i ) {

			addToOutput("NULL");

		}

		elsif ( /^OCTET STRING\s*$/i ) {

			$i++;

			addToOutput("OCTETSTRING");				

			nest();

			addToOutput("RAW \{");

			nest();

			addToOutput(getRawHex($lines,\$i));

			leaveNest();

			addToOutput("\}");

			leaveNest();

			addToOutput("END");								

		}

		elsif ( /^OCTET\s+STRING.*encapsulates/i ) {

			addToOutput("OCTETSTRING");

			nest();			

		}

		elsif ( /^OCTET\s+STRING/i ) {

			addToOutput("OCTETSTRING");

			nest();			

			my $hex = $_;

			$hex =~ s/OCTET\s+STRING\s+//g;

			addToOutput("RAW=$hex");

			leaveNest();

			addToOutput("END");

		}

		elsif ( /^OBJECT\s+IDENTIFIER\s+\'([\d ]+)\'/i ) { 

			# plain oid

			my $oid = $1;

			$oid =~ s/ /./g;

			addToOutput("OID=$oid");

		}

		elsif ( /(^OBJECT\s+IDENTIFIER.*\()([\d ]+)/i ) { 

			# extra information printed with oid

			my $oid = $2;

			$oid =~ s/ /./g;

			addToOutput("OID=$oid");

		}

		elsif ( /(^PRINTABLESTRING\s*\')([^\']*)/i ) {

			addToOutput("PRINTABLESTRING=$2");

		}

		elsif ( /^SEQUENCE/i ) {

			addToOutput("SEQUENCE");

			nest();

		}

		elsif ( /^SET/i ) {

			addToOutput("SET");

			nest();

		}

		elsif (/^(UTCTIME\s+\')([^\']+)/i) {

			addToOutput("UTCTIME=$2");

		}

		elsif ( /^(UTF8STRING\s+)\'(.*)\'/i ) {

			addToOutput("UTF8STRING=$2");

		}

		elsif ( /^\}/) {				

			leaveNest();

			addToOutput("END");

		}

		elsif (isRawData($_)) {

			my $raw = s/\s+/ /g;

			addToOutput("RAW=$_");

		}

	}

}

sub addToOutput($) {

	my ($text) = @_;

	if ($DEBUG >= 3) {

		print "+${TABS}$text\n";

	}

	$OUTPUT_BUFFER .= "${TABS}$text\n";

}

sub getRawHex($) {

	my ($lines,$index) = @_;

	my $translated = '';

	my $end = 0;

	do {

		my $line = $$lines[$$index];

		last if (!defined $line);

		chomp($line);

		if (isRawData($line)) {

			$line =~ s/^\s+//g;

			addToOutput("$line");

			$$index++;

		}

		else {

			$$index--;

			$end = 1;

		}					

	} while (! $end);

	return $translated;

}

sub isRawData() {

	my ($line) = @_;

	my $retVal = ($line =~ /^\s*([A-F0-9][A-F0-9]\s?)+$/i);

	if ($DEBUG >= 3 && $retVal) {

		print "RAW: ";

	}

	return $retVal;

}

sub toBitString() {

	my ($hex) = @_;

	my $bitStr = "";

	$hex =~ s/\s//g;

	for (my $i=0; $i < length($hex); $i+=2) {

		my $num = hex(substr($hex, $i, 2));

		print ".$num";

		for (my $j=0; $j < 8; $j++) {

			$bitStr .= ($num & 0x80) ? '1' : '0';

			$num <<= 1;

		}

	}

	if ($DEBUG >= 2) {

		print "\nbitStr: $hex = $bitStr\n";

	}

	return $bitStr;

}

# increment debug tabbing level

sub nest() {

	$TABS .= "   ";

}

# decrement debug tabbing level

sub leaveNest() {

	$TABS =~ s/^...//;

}

sub decompile($) {

	my ($inFile) = @_;

	my @command = ("cmd", 

				   "/C \"dumpasn1 -apruz $inFile > _dump.tmp\"");

	if ((my $err = system(@command)) != 0) {

		die "decode: " . join(" ", @command) . "\nreturned error $err";

	}

	my $dumpFh;

	open $dumpFh, "_dump.tmp";

	my @lines = <$dumpFh>;

	close $dumpFh;

	return @lines;

}