#

# Copyright (c) 2000-2009 Nokia Corporation and/or its subsidiary(-ies).

# All rights reserved.

# This component and the accompanying materials are made available

# under the terms of "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: 

#

use strict;

use integer;

sub PerlScriptPath

	{

	my $perlScriptPath=$0;

	my $os = $^O; #get the OS type

	#check OS type

  if($os=~/MSWin32/) #Windows OS

    {

    $perlScriptPath=~s/\//\\/g; # replace any forward-slashes with back-slashes

    $perlScriptPath=~s/(\\?)[^\\]+$/$1/; # get rid of this Perl-script's file-name

    }

  else #Unix OS

    {

    $perlScriptPath=~s/\\/\//g; # replace any back-slashes with forward-slashes

    $perlScriptPath=~s/(\/?)[^\/]+$/$1/; # get rid of this Perl-script's file-name

    }

	return $perlScriptPath;

	}

BEGIN

	{

	unshift(@INC, &PerlScriptPath()); # can't do "use lib &PerlScriptPath()" here as "use lib" only seems to work with *hard-coded* directory names

	}

use PARSER;

use UTF;

# The following numbers are used for byte-orders:

#     0 means unspecified

#     1 means big-endian

#     2 means little-endian

FixParametersToWorkWithWindows98(\@ARGV);

my $versionNumber = 3;

my $outputByteOrderMark = 0;

my $unicodeByteOrder = 0;

my $inputEncoding = ""; 

my $outputEncoding = ""; 

my %foreignCharacters = (); # Hash with the foreign Character code as the value, unicode as key 

my %unicodeCharacters = (); # Hash with the Unicode Character code as the value, foreign as key 

my $inputFile=\*STDIN;

my $outputFile=\*STDOUT;

ReadParameters(\@ARGV,\$outputByteOrderMark,\$unicodeByteOrder,\$inputEncoding,\$outputEncoding,\$inputFile,\$outputFile);

HandleByteOrderMarks($outputByteOrderMark,\$unicodeByteOrder, \$inputEncoding,\$outputEncoding, $inputFile, $outputFile);

DoConversion(\$unicodeByteOrder, \$inputEncoding, \$outputEncoding, $inputFile, $outputFile, \%foreignCharacters, \%unicodeCharacters);

if ($inputFile!=\*STDIN)

	{

	close($inputFile) or die;

	}

if ($outputFile!=\*STDOUT)

	{

	close($outputFile) or die;

	}

sub FixParametersToWorkWithWindows98

	{

	my $parameters=shift;

	my $i;

	for ($i=@$parameters-2; $i>=0; --$i) # iterate backwards as some parameters may be deleted from @$parameters

		{

		if (($parameters->[$i]=~/^(-input)$/i) ||

			($parameters->[$i]=~/^(-output)$/i))

			{

			$parameters->[$i].='='.$parameters->[$i+1];

			splice(@$parameters, $i+1, 1);

			}

		}

	}

sub PrintUsage 

	{

	print "\nVersion $versionNumber\n\nCharacter set conversion tool\nCopyright (c) 1999 Symbian Ltd\n\n";

	print "Usage:\n\n\t charconv [<options>] <inputspec> <outputspec>\n\nwhere\n\n\t";

	print "options    :=  [-big|-little][-byteordermark]\n\t";

	print "inputspec  :=  -input=<format> [<input_file>]\n\t";

	print "outputspec :=  -output=<format> [<output_file>]\n\t";

	print "format     :=  unicode|utf8|big5|gb2312...\n\n";

	}

sub Assert

	{

	my $condition = shift;

	my $errorMessage = shift;

	if (!($condition)) # find out where this is used and work this out 

		{

		die("Error: $errorMessage");

		}

	}

sub PrintWarning 

	{

	my $warningMessage = shift;

	print STDERR "Warning: $warningMessage\n";

	}

sub TryFileParameter 

	{

	my $args = shift;

	my $argindex = shift;

	my $inputoroutput = shift;

	my $encoding = shift;

	my $filehandle = shift;

	my $prefix = "-$inputoroutput=";

	if ($args->[$$argindex] =~ /^$prefix(.*)/)

		{

		Assert($$encoding eq "", "\"$prefix...\" is specified more than once");

		$$encoding = $1;

		++$$argindex;

		if (($$argindex >= @$args) || ($args->[$$argindex] =~ /^-/))

			{

			--$$argindex;

			}

		else

			{

			if ($inputoroutput =~ /input/i)

				{

				open(INPUT_FILE,"<$args->[$$argindex]") or die "opening $inputoroutput-file failed $!";

				$$filehandle=\*INPUT_FILE;

				}

			else

				{

				open(OUTPUT_FILE,">$args->[$$argindex]") or die "opening $inputoroutput-file failed $!";

				$$filehandle=\*OUTPUT_FILE;

				}

			}

		binmode $$filehandle;

		return  1;

		}

	return 0; 

	}

sub ReadParameters 

	{

	my $args = shift; 

	my $outputbyteordermark = shift;

	my $unicodebyteorder = shift;

	my $inputencoding = shift;

	my $outputencoding = shift;

	my $inputhandle = shift;

	my $outputhandle = shift;

	my $i;

	my $range;

	if ((@$args <= 0) || ($args->[0] eq "?") || ($args->[0] eq "/?"))

		{

		PrintUsage();

		exit;

		}

	for ($i = 0; $i < @$args ; ++$i)

		{

		if ( $args->[$i]=~ /-byteordermark/i)

			{

			Assert(!$$outputbyteordermark, "\"-byteordermark\" is specified more than once");

			$$outputbyteordermark = 1; 

			}

		elsif ($args->[$i]=~ /-big/i)

			{

			Assert(($$unicodebyteorder==0),"the byte order of unicode text (i.e. \"-big\"/\"-little\") is specified more than once");

			$$unicodebyteorder = 1;

			}

		elsif ($args->[$i]=~ /-little/i)

			{

			Assert(($$unicodebyteorder==0),"the byte order of unicode text (i.e. \"-big\"/\"-little\") is specified more than once");

			$$unicodebyteorder = 2;

			}

		else

			{ 

			Assert(TryFileParameter($args, \$i, "input",$inputencoding,$inputhandle) ||

				   TryFileParameter($args, \$i, "output",$outputencoding, $outputhandle), "bad parameter \"$args->[$i]\"");

			}

		}

	Assert($$inputencoding ne "", "no input encoding is specified");

	Assert($$outputencoding ne "", "no output encoding is specified");

	}

sub ReadFromFile

	{  

	my $buffer = shift;

	my $numOfBytesToRead = shift;

	my $inputhandle = shift;

	my $numOfBytesRead = 0;									

	my $numOfBytesToReadThisTime = $numOfBytesToRead;		

	for(;;)

		{

		for(;;)

			{

			my $remainingNumOfBytesToRead = $numOfBytesToRead - $numOfBytesRead;  

			if ($numOfBytesToReadThisTime > $remainingNumOfBytesToRead)

				{

				$numOfBytesToReadThisTime = $remainingNumOfBytesToRead;

				}  		

			my $numOfBytesReadThisTime = read $inputhandle, $$buffer, $numOfBytesToReadThisTime;  

			if (defined $numOfBytesReadThisTime)

				{

				$numOfBytesRead += $numOfBytesReadThisTime;

				Assert($numOfBytesRead <= $numOfBytesReadThisTime, "internal error (read too many bytes)");

				if (($numOfBytesRead >= $numOfBytesReadThisTime) || $numOfBytesReadThisTime == 0)

					{

					return;

					}

				last;

				}

			$numOfBytesToReadThisTime /= 2;

			Assert($numOfBytesToReadThisTime >0, "reading from file failed");

			}

		}

	}

sub HandleByteOrderMarks 

	{

	my $outputbyteordermark = shift;

	my $unicodebyteorder = shift;

	my $inputencoding = shift;

	my $outputencoding = shift;

	my $inputhandle = shift;

	my $outputhandle = shift;

	if ($$inputencoding =~ /unicode/i) 

		{

		my $firstUnicodeCharacter = 0; 

		ReadFromFile(\$firstUnicodeCharacter, 2, $inputhandle);

		my $byteOrderSpecifiedByByteOrderMark = 0;

		if (length($firstUnicodeCharacter) == 2)

			{

			my @firstUnicodeCharacter = unpack "C*", $firstUnicodeCharacter;

			if (($firstUnicodeCharacter[0]==0xff) && ($firstUnicodeCharacter[1]==0xfe))

				{

				$byteOrderSpecifiedByByteOrderMark = 2; 

				}

			elsif (($firstUnicodeCharacter[0]==0xfe) && ($firstUnicodeCharacter[1]==0xff))

				{

				$byteOrderSpecifiedByByteOrderMark = 1; 

				}

			else

				{

				my $error = seek $inputhandle, 0, 0; # rewind to start of file

				Assert ($error == 1, "could not rewind to the start of input file");

				}

			}

		if ($byteOrderSpecifiedByByteOrderMark!=0)

			{

			if (($$unicodebyteorder!=0) && ($byteOrderSpecifiedByByteOrderMark!=$$unicodebyteorder))

				{

				PrintWarning ("the byte order specified by the byte-order mark in the unicode input is different from the byte order specified by the parameter - taking the byte-order specified by the byte-order mark in the unicode input");

				}

			$$unicodebyteorder = $byteOrderSpecifiedByByteOrderMark;

			}

		}

	if ($outputbyteordermark)

		{

		if ($$outputencoding ne "unicode") 

			{

			PrintWarning("\"-byteordermark\" is only relevant for unicode output");

			}

		else

			{

			Assert($$unicodebyteorder!=0, "the byte order must be specified if a byte-order mark is to be added to the unicode output");

			my $firstUnicodeCharacter=($$unicodebyteorder==1)? "\xfe\xff": "\xff\xfe";

			WriteToFile(\$firstUnicodeCharacter, $outputhandle);

			}

		}

	}

sub WriteToFile 

	{

	my $buffer = shift;

	my $outputhandle = shift;

	print $outputhandle $$buffer;

	}

sub DoConversion

	{

	my $unicodebyteorder = shift;

	my $inputencoding = shift;

	my $outputencoding = shift;

	my $inputhandle = shift;

	my $outputhandle = shift; 

	my $foreignCharacters = shift;

	my $unicodeCharacters = shift;

	my $currentBuffer = 0;

	my @arrayOfBuffers = ('', '', '');

	my $largeNumber=1000000;

	ReadFromFile(\($arrayOfBuffers[$currentBuffer]), $largeNumber, $inputhandle);

	ReverseByteOrderIfUnicodeAndBigEndian($unicodebyteorder, $inputencoding, \($arrayOfBuffers[$currentBuffer]));

	if ($$inputencoding ne $$outputencoding) 

		{

		if ($$inputencoding !~ /^unicode$/i)

			{

			my $nextBuffer = $currentBuffer + 1;

			OtherToUnicode ($inputencoding, \($arrayOfBuffers[$nextBuffer]), ($arrayOfBuffers[$currentBuffer]), $foreignCharacters, $unicodeCharacters, 'v');

			$currentBuffer = $nextBuffer;

			}

		if ($$outputencoding !~ /^unicode$/i)

			{

			my $nextBuffer = $currentBuffer + 1;

			UnicodeToOther($outputencoding, \($arrayOfBuffers[$nextBuffer]), ($arrayOfBuffers[$currentBuffer]), $foreignCharacters, $unicodeCharacters, 'v');

			$currentBuffer = $nextBuffer;

			}

		}

	ReverseByteOrderIfUnicodeAndBigEndian($unicodebyteorder, $outputencoding, \($arrayOfBuffers[$currentBuffer]));

	WriteToFile(\($arrayOfBuffers[$currentBuffer]), $outputhandle);

	}

sub ReverseByteOrderIfUnicodeAndBigEndian

	{

	my $unicodebyteorder = shift;

	my $encoding = shift;

	my $buffer = shift;

	my $i;

	if ($$encoding =~ /^unicode$/i)

		{

		Assert(length($$buffer)%2==0, "internal error (bad number of bytes in unicode buffer)");

		if ($$unicodebyteorder==0)

			{

			PrintWarning("the byte order of unicode text is unspecified - defaulting to little-endian");

			$$unicodebyteorder = 2;

			}

		if ($$unicodebyteorder==1)

			{

			$$buffer=pack('v*', unpack('n*', $$buffer));

			}

		}

	}

sub FillInHashes

	{

	my $foreignCharacters = shift;

	my $unicodeCharacters = shift;

	my $encoding = shift; 

	my $replacementCharacter = shift;

	my $ranges = shift;

	my $bigEndian = shift;

	my $endianness = 0;

	my $replacenum = 0;

	my $rangenum = 0;

	my $fileread = 0;

	my $largenumber = 1000000;

	my $dataFile=&PerlScriptPath()."charconv\\".$$encoding.'.dat';

	my $line;

	if (-e $dataFile)

		{

		open (HASH_INPUT, "< $dataFile") or die ("Could not open file for reading");

		binmode HASH_INPUT;

		# reading the endianness

		$fileread = read HASH_INPUT, $endianness, 1;

		$endianness = unpack "C",$endianness;

		if ($endianness == 0)

			{

			# set the template to a default-> n for the eman time

			$$bigEndian = 0;

			}

		elsif ($endianness == 1)

			{

			$$bigEndian = 0;

			}

		elsif ($endianness == 2)

			{

			$$bigEndian = 1;

			}

		else

			{

			print "Illegal Endianness specified in the control files";

			}

		#reading the replacement characters

		$fileread = read HASH_INPUT, $replacenum,1;

		$replacenum= unpack "C",$replacenum;

		$fileread = read HASH_INPUT, $$replacementCharacter,$replacenum;

		# reading the ranges

		$fileread = read HASH_INPUT, $rangenum, 1;

		$rangenum = unpack "C",$rangenum;

		my $i; # loop variable 

		for ($i=0; $i < $rangenum; ++$i)

			{

			my $lowerrange = 0;

			my $upperrange = 0;

			my $followchar = 0;

			$fileread = read HASH_INPUT,$lowerrange,1;

			$lowerrange = unpack "C",$lowerrange;

			$fileread = read HASH_INPUT,$upperrange,1;

			$upperrange = unpack "C",$upperrange;

			$fileread = read HASH_INPUT,$followchar,1;

			$followchar = unpack "C",$followchar;

			push @$ranges,[$lowerrange,$upperrange,$followchar];

			}

		my $data = 0;

		my @unpackeddata = 0;

		$fileread = read HASH_INPUT, $data, $largenumber;

		@unpackeddata = unpack "v*",$data;

		for($i = 0; $i <= $#unpackeddata; $i= $i+2)

			{

			$unicodeCharacters->{$unpackeddata[$i]}=$unpackeddata[$i+1];

			$foreignCharacters->{$unpackeddata[$i+1]}=$unpackeddata[$i];

			}

		}

	else

		{

		die ("Encoding Format \"$$encoding\" not recognised");

		}

	}

sub OtherToUnicode

	{

	my $inputencoding = shift;

	my $unicode = shift;  

	my $other = shift; 

	my $foreignCharacters = shift;

	my $unicodeCharacters = shift;

	my $unicodetemplate = shift;

	my $replacementCharacter = 0;

	my $unicodeReplacementCharacter = pack($unicodetemplate, 0xfffd);

	my @ranges=(); 

	my $otherIndex= 0;

	my $numOfBytes = length($other);

	my $key = 0;

	my $inRange = 0;

	my $followByte = -1;

	if ($$inputencoding=~/^utf8$/i)

		{

		return &Utf8ToUnicode($unicode, $other, $unicodetemplate);

		}

	my $bigEndian;

	FillInHashes($foreignCharacters,$unicodeCharacters, $inputencoding, \$replacementCharacter,\@ranges,\$bigEndian);

	for (;;)

		{

		if ($otherIndex > $numOfBytes -1) 

			{

			last;

			}

		my $frontByte = (unpack("x$otherIndex".'C', $other))[0];

		# @ranges is an array of references. Each reference is a reference to an array

		for ($key = 0; $key <= $#ranges; ++$key)

			{

			my $arrayref = $ranges[$key];

			if (($frontByte >= $arrayref->[0]) && ($frontByte <= $arrayref->[1]))

				{

				$followByte = $arrayref->[2];

				$inRange = 1;

				}

			}

		Assert ($inRange != 0, "cannot figure out the Byte size of the character");

		my $tempByte = 0;

		for ($key = 0; $key<= $followByte; ++$key)

			{

			if ($bigEndian)

				{

				$tempByte = ($tempByte << 8) | (unpack("x$otherIndex".'C', $other))[0];

				}

			else

				{

				$tempByte = $tempByte | ((unpack("x$otherIndex".'C', $other))[0] << (8*$key));

				}

			$otherIndex++;	

			}

		if (exists $unicodeCharacters->{$tempByte})

			{

			$$unicode .= pack $unicodetemplate , $unicodeCharacters->{$tempByte};

			}

		else

			{

			$$unicode .= $unicodeReplacementCharacter;

			}

		}

	}

sub UnicodeToOther

	{

	my $outputencoding = shift;

	my $other = shift;

	my $unicode = shift;

	my $foreignCharacters = shift;

	my $unicodeCharacters = shift;

	my $unicodetemplate = shift;

	my $replacementCharacter = 0;

	my @ranges=(); 

	my $unicodeIndex= 0;

	my $numOfBytes = length($unicode);

	my @UnicodeUnpacked = ();

	my $key = 0;

	if ($$outputencoding=~/^utf8$/i)

		{

		return &UnicodeToUtf8($other, $unicode, $unicodetemplate);

		}

	my $bigEndian;

	FillInHashes($foreignCharacters,$unicodeCharacters, $outputencoding, \$replacementCharacter,\@ranges,\$bigEndian);

	my $foreignTemplate=$bigEndian? 'n': 'v';

	@UnicodeUnpacked = unpack "$unicodetemplate*", $unicode;

	foreach $key (@UnicodeUnpacked)

		{

		if (!exists($foreignCharacters->{$key}))

			{

			$$other .= $replacementCharacter;

			}

		else

			{

			# This is the WRONG but it will work for the mean time

			# This will fail if the foreignCharacter has characters that are more than

			# two bytes long ..... But this should work for foreign characters of 1 or 2 Bytes

			my $foreignValue = $foreignCharacters->{$key};

			if ( $foreignValue <= 255)

				{

				$$other .= pack "C" , $foreignValue;

				}

			else

				{

				$$other .= pack $foreignTemplate, $foreignValue;

				}

			}

		}

	}