1 #

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

     3 # All rights reserved.

     4 # This component and the accompanying materials are made available

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

     6 # which accompanies this distribution, and is available

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

     8 #

     9 # Initial Contributors:

    10 # Nokia Corporation - initial contribution.

    11 #

    12 # Contributors:

    13 #

    14 # Description:      

    15 #

    16 

    17 use strict;

    18 use integer;

    19 

    20 package UTF;

    21 require Exporter;

    22 @UTF::ISA=qw(Exporter);

    23 @UTF::EXPORT=qw(Utf8ToUnicode UnicodeToUtf8);

    24 

    25 my $KErrorIllFormedInput=-1;

    26 

    27 sub Utf8ToUnicode

    28 	{

    29 	my $Unicode = shift;  

    30 	my $Utf8 = shift;

    31 	my $UnicodeTemplate = shift;

    32 	my $Utf8Index = 0;

    33 	my $UnicodeIndex = 0;

    34 	my $numOfBytes = length($Utf8);

    35 	my @Utf8Unpacked = unpack "C*",$Utf8;

    36 	my @UnicodeUnpacked = (); 

    37 

    38 	for (;;)

    39 		{

    40 		if ($Utf8Index > $#Utf8Unpacked)

    41 			{

    42 			last;

    43 			}

    44 

    45 		my $currentUtf8Byte = $Utf8Unpacked[$Utf8Index];

    46 		

    47 		if (($currentUtf8Byte&0x80)==0x00)

    48 			{

    49 			$UnicodeUnpacked[$UnicodeIndex] = $currentUtf8Byte;

    50 			}

    51 		

    52 		elsif (($currentUtf8Byte&0xe0)==0xc0)

    53 			{

    54 			my $currentUnicodeCharacter=(($currentUtf8Byte&0x1f)<<6);

    55 			++$Utf8Index;

    56 			$currentUtf8Byte=$Utf8Unpacked[$Utf8Index];

    57 			if (($currentUtf8Byte&0xc0)!=0x80)

    58 				{

    59 				return $KErrorIllFormedInput;

    60 				}

    61 			$currentUnicodeCharacter|=($currentUtf8Byte&0x3f);

    62 			$UnicodeUnpacked[$UnicodeIndex] = $currentUnicodeCharacter;

    63 			}

    64 

    65 		elsif (($currentUtf8Byte&0xf0)==0xe0)

    66 			{

    67 			my $currentUnicodeCharacter=(($currentUtf8Byte&0x0f)<<12);

    68 			++$Utf8Index;

    69 			$currentUtf8Byte=$Utf8Unpacked[$Utf8Index];

    70 			if (($currentUtf8Byte&0xc0)!=0x80)

    71 				{

    72 				return $KErrorIllFormedInput;

    73 				}

    74 			$currentUnicodeCharacter|=(($currentUtf8Byte&0x3f)<<6);

    75 			++$Utf8Index;

    76 			$currentUtf8Byte=$Utf8Unpacked[$Utf8Index];

    77 			if (($currentUtf8Byte&0xc0)!=0x80)

    78 				{

    79 				return $KErrorIllFormedInput;

    80 				}

    81 			$currentUnicodeCharacter|=($currentUtf8Byte&0x3f);

    82 			$UnicodeUnpacked[$UnicodeIndex] = $currentUnicodeCharacter;

    83 			}

    84 

    85 		elsif (($currentUtf8Byte&0xf8)==0xf0)

    86 			{                                         

    87 			my $currentUnicodeCharacter=(($currentUtf8Byte&0x07)<<8);

    88 			++$Utf8Index;

    89 			$currentUtf8Byte=$Utf8Unpacked[$Utf8Index];

    90 			if (($currentUtf8Byte&0xc0)!=0x80)

    91 				{

    92 				return $KErrorIllFormedInput;

    93 				}

    94 			$currentUnicodeCharacter|=(($currentUtf8Byte&0x3f)<<2);

    95 			if ($currentUnicodeCharacter<0x0040)

    96 				{

    97 				return $KErrorIllFormedInput;

    98 				}

    99 			$currentUnicodeCharacter-=0x0040;

   100 			if ($currentUnicodeCharacter>=0x0400)

   101 				{

   102 				return $KErrorIllFormedInput;

   103 				}

   104 			++$Utf8Index;

   105 			$currentUtf8Byte=$Utf8Unpacked[$Utf8Index];

   106 			if (($currentUtf8Byte&0xc0)!=0x80)

   107 				{

   108 				return $KErrorIllFormedInput;

   109 				}

   110 			$currentUnicodeCharacter|=(($currentUtf8Byte&0x30)>>4);

   111 			$UnicodeUnpacked[$UnicodeIndex] = (0xd800|$currentUnicodeCharacter);

   112 			$currentUnicodeCharacter=(($currentUtf8Byte&0x0f)<<6);

   113 			++$Utf8Index;

   114 			$currentUtf8Byte=$Utf8Unpacked[$Utf8Index];

   115 			if (($currentUtf8Byte&0xc0)!=0x80)

   116 				{

   117 				return $KErrorIllFormedInput;

   118 				}

   119 			$currentUnicodeCharacter|=($currentUtf8Byte&0x3f);

   120 			++$UnicodeIndex;

   121 			$UnicodeUnpacked[$UnicodeIndex] = (0xdc00|$currentUnicodeCharacter);

   122 			}

   123 		else

   124 			{

   125 			return $KErrorIllFormedInput;

   126 			}

   127 		++$UnicodeIndex;

   128 		++$Utf8Index;

   129 		}

   130 	$$Unicode = (); 

   131 	$$Unicode = pack "$UnicodeTemplate*", @UnicodeUnpacked;

   132 	return $UnicodeIndex;  

   133 	}

   134 

   135 sub UnicodeToUtf8

   136 	{

   137 	my $Utf8 = shift; 

   138 	my $Unicode = shift;

   139 	my $UnicodeTemplate = shift;

   140 	my $Utf8Index = 0;

   141 	my $UnicodeIndex = 0;

   142 	my $numOfBytes = length($Unicode);

   143 	my @UnicodeUnpacked = unpack "$UnicodeTemplate*", $Unicode;

   144 	my @Utf8Unpacked = ();

   145 	

   146 	for (;;)

   147 		{

   148 		# exit the loop if no more in the UnicodeUnpacked

   149 		if ($UnicodeIndex > $#UnicodeUnpacked)

   150 			{

   151 			last;

   152 			}

   153 

   154 		my $currentUnicodeCharacter=$UnicodeUnpacked[$UnicodeIndex];

   155 		if (($currentUnicodeCharacter&0xff80)==0x0000)

   156 			{	

   157 			$Utf8Unpacked[$Utf8Index]= $currentUnicodeCharacter;

   158 			}

   159 		elsif (($currentUnicodeCharacter&0xf800)==0x0000)

   160 			{

   161 

   162 			$Utf8Unpacked[$Utf8Index]= (0xc0 | $currentUnicodeCharacter >> 6);

   163 			++$Utf8Index;

   164 			$Utf8Unpacked[$Utf8Index]= (0x80 | $currentUnicodeCharacter&0x3f);

   165 			}

   166 		elsif (($currentUnicodeCharacter&0xfc00)==0xd800)

   167 			{

   168 			$currentUnicodeCharacter+=0x0040;

   169 			$Utf8Unpacked[$Utf8Index]= (0xf0|(($currentUnicodeCharacter>>8)&0x07));

   170 			++$Utf8Index;

   171 			$Utf8Unpacked[$Utf8Index]= (0x80|(($currentUnicodeCharacter>>2)&0x3f));

   172 			my $currentUtf8Byte=(0x80|(($currentUnicodeCharacter&0x03)<<4));

   173 			++$UnicodeIndex;

   174 			$currentUnicodeCharacter=$UnicodeUnpacked[$UnicodeIndex];

   175 			if (($currentUnicodeCharacter&0xfc00)!=0xdc00)

   176 				{

   177 				return $KErrorIllFormedInput;

   178 				}

   179 			$currentUtf8Byte|=(($currentUnicodeCharacter>>6)&0x0f);

   180 			++$Utf8Index;

   181 			$Utf8Unpacked[$Utf8Index]= $currentUtf8Byte;

   182 			++$Utf8Index;

   183 			$Utf8Unpacked[$Utf8Index]= (0x80| ($currentUnicodeCharacter&0x3f));

   184 			}

   185 		else

   186 			{

   187 			$Utf8Unpacked[$Utf8Index]= (0xe0|($currentUnicodeCharacter>>12));

   188 			++$Utf8Index;

   189 			$Utf8Unpacked[$Utf8Index]= (0x80|(($currentUnicodeCharacter>>6)&0x3f));

   190 			++$Utf8Index;

   191 			$Utf8Unpacked[$Utf8Index]= (0x80| ($currentUnicodeCharacter&0x3f));

   192 			}

   193 		++$Utf8Index;

   194 		++$UnicodeIndex;

   195 		}

   196 	$$Utf8 = ();	

   197 	$$Utf8 = pack "C*", @Utf8Unpacked;

   198 	return $Utf8Index; 

   199 

   200 	}