/*+
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* Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies).+
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* All rights reserved.+
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* This component and the accompanying materials are made available+
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* under the terms of "Eclipse Public License v1.0"+
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* which accompanies this distribution, and is available+
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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*+
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* Initial Contributors:+
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* Nokia Corporation - initial contribution.+
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*+
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* Contributors:+
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*+
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* Description: +
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*+
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*/+
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#include <e32svr.h>+
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#include <e32std.h>+
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#include <e32def.h>+
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#include <e32des8.h> +
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+
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#include "unicodeconv.h"+
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+
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//replacement character to be used when unicode cannot be converted+
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const TUint8 KForeignReplacement = 0x5F;+
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+
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//This function converts from Unicoded characters, to foreign characters and adds them into a descriptor+
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void UnicodeConv::ConvertFromUnicodeL(TDes8& aForeign, const TDesC16& aUnicode)+
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	{	+
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	const TInt unicodeLength = aUnicode.Length();+
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	+
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	//loop going through the character of the unicode descriptor+
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	for(TInt i=0; i<unicodeLength; i++)+
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		{+
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		const TUint16 unicodeChar = aUnicode[i];+
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		+
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		if (aForeign.Length() >= aForeign.MaxLength())+
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			{+
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			User::Leave(KErrOverflow);+
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			}+
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		+
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		//charcters from 0x0000 to 0x007F, can be mapped directly+
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		if(unicodeChar<0x0080)+
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			{+
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			aForeign.Append(static_cast<TUint8>(unicodeChar));+
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			}+
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		else+
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			{+
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			TInt trailByte = KErrNotFound;+
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			TInt returnValue = TConvDataStruct::ConvertSingleUnicode(unicodeChar,trailByte);+
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			+
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			if(returnValue!=KErrNotFound)+
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				{+
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				if(trailByte!=KErrNotFound)		+
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					{+
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					if (aForeign.Length() + 2 <= aForeign.MaxLength())+
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						{											+
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						aForeign.Append(static_cast<TUint8>(returnValue));+
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						aForeign.Append(static_cast<TUint8>(trailByte));						+
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						}+
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					else+
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						{+
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						User::Leave(KErrOverflow);+
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						}	+
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					}+
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				else+
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					aForeign.Append(static_cast<TUint8>(returnValue));+
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				}		+
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			else+
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				aForeign.Append(KForeignReplacement);+
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			} +
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		}		+
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	}+
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				+
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				+
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+
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//This function converts from foreign characters into unicode and adds them into a descriptor+
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void UnicodeConv::ConvertToUnicodeL(TDes16& aUnicode, const TDesC8& aForeign)+
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	{+
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	const TInt foreignLength = aForeign.Length();+
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+
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	//loop going through the characters of the foreign descriptor+
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	for(TInt i = 0; i<foreignLength; i++)+
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		{+
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		const TUint8 leadForeign = aForeign[i];+
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		+
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		if (aUnicode.Length() >= aUnicode.MaxLength())+
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			{+
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			User::Leave(KErrOverflow);+
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			}+
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		+
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		TUint8 tailForeign = 0x00;+
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		//charcters from 0x00 to 0x7F, can be mapped directly+
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		if(leadForeign < 0x80)+
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			aUnicode.Append(static_cast<TUint16>(leadForeign));+
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		else+
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			{+
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			if((i+1)<foreignLength)+
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				tailForeign = aForeign[i+1];+
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+
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			const TLeadOrSingle* structPtr = TConvDataStruct::KFirstByteConversions + (leadForeign-0x80);+
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			+
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			if(structPtr->iUnicodeIfSingle)+
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				aUnicode.Append(structPtr->iUnicodeIfSingle);+
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			else+
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				{+
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				if(TConvDataStruct::KMinTrailByte<=tailForeign && tailForeign<=TConvDataStruct::KMaxTrailByte)+
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					aUnicode.Append(TConvDataStruct::KDoubleByteConversions[structPtr->iDoubleByteIndex++
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						(tailForeign - TConvDataStruct::KMinTrailByte)]);+
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				else+
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					aUnicode.Append(0xFFFD);+
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				i++;+
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				}+
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			}+
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		}  +
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+
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	}+
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+
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TBool UnicodeConv::IsLegalShortNameCharacter (TUint aCharacter)+
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	{+
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	if (aCharacter>=0x0080)+
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		{+
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		if (aCharacter>0xFFFF)+
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			return EFalse;+
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		+
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		TInt trailByte = KErrNotFound;+
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		TInt returnValue = TConvDataStruct::ConvertSingleUnicode(aCharacter,trailByte);+
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		+
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		if(returnValue!=KErrNotFound)+
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			return ETrue;+
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		}+
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	if(aCharacter>= 'a' && aCharacter<= 'z')+
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		return(ETrue);+
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	if(aCharacter>= 'A' && aCharacter<= 'Z')+
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		return(ETrue);+
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	if(aCharacter>= '0' && aCharacter<= '9')+
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		return(ETrue);+
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+
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	switch (aCharacter)+
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		{+
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		case '\'':+
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		case '`':+
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		case '-':+
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		case '_':+
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		case '^':+
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		case '$':+
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		case '~':+
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		case '!':+
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		case '#':+
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		case '%':+
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		case '&':+
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		case '{':+
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		case '}':+
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		case '@':+
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		case '(':+
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		case ')':+
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			return ETrue;+
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		default:+
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			return EFalse;+
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		}+
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	}		+
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+
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