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/*
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* Copyright (c) 1998-2009 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 the License "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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* UTF8STR.CPP
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* This file contains the implementation of the UTF8 String ASN1 class.
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* The IA5 string can contain the following characters:
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* \<character set unknown pending arrival of ITU spec\>
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*
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*/
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/**
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@file
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*/
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#include <asn1dec.h>
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TInt ConvertToUnicodeFromUtf8(TDes16& aUnicode, const TDesC8& aUtf8);
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EXPORT_C TASN1DecUTF8String::TASN1DecUTF8String(void)
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{
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}
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EXPORT_C HBufC* TASN1DecUTF8String::DecodeDERL(const TASN1DecGeneric& aSource)
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{
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return DecodeContentsL(aSource.GetContentDER());
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}
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EXPORT_C HBufC* TASN1DecUTF8String::DecodeDERL(const TDesC8& aSource,TInt& aPos)
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{
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TPtrC8 Source=aSource.Mid(aPos);
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TASN1DecGeneric gen(Source);
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gen.InitL();
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HBufC* res = DecodeContentsL(gen.GetContentDER());
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aPos+=gen.LengthDER();
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return res;
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}
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HBufC* TASN1DecUTF8String::DecodeContentsL(const TDesC8& aSource)
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{
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HBufC* res = HBufC::NewLC(aSource.Length());
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TPtr pRes = res->Des();
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User::LeaveIfError(ConvertToUnicodeFromUtf8(pRes, aSource));
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CleanupStack::Pop(res);
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return res;
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}
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/**
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* Converts text encoded using the Unicode transformation format UTF-8
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* into the Unicode UCS-2 character set.
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*
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* @param aUnicode On return, contains the Unicode encoded output string.
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* @param aUtf8 The UTF-8 encoded input string
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* @return The number of unconverted bytes left at the end of the
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* input descriptor, or one of the error values defined
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* in <code>TError</code>.
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*/
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TInt ConvertToUnicodeFromUtf8(TDes16& aUnicode, const TDesC8& aUtf8)
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{
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if (aUtf8.Length()==0)
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{
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aUnicode.SetLength(0);
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return 0;
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}
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if (aUnicode.MaxLength()==0)
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{
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return aUtf8.Length();
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}
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TUint16* pointerToCurrentUnicodeCharacter=CONST_CAST(TUint16*, aUnicode.Ptr());
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const TUint16* pointerToLastUnicodeCharacter=pointerToCurrentUnicodeCharacter+(aUnicode.MaxLength()-1);
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const TUint8* pointerToCurrentUtf8Byte=aUtf8.Ptr();
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const TUint8* pointerToLastUtf8Byte=pointerToCurrentUtf8Byte+(aUtf8.Length()-1);
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TBool inputIsTruncated=EFalse;
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TUint16 replacementcharacter = 0xFFFD;
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FOREVER
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{
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//__ASSERT_DEBUG(pointerToCurrentUnicodeCharacter<=pointerToLastUnicodeCharacter, Panic(EPanicBadUnicodePointers8));
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//__ASSERT_DEBUG(pointerToCurrentUtf8Byte<=pointerToLastUtf8Byte, Panic(EPanicBadUtf8Pointers3));
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TUint currentUtf8Byte=*pointerToCurrentUtf8Byte;
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if ((currentUtf8Byte&0x80)==0x00)
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{
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*pointerToCurrentUnicodeCharacter=STATIC_CAST(TUint16, currentUtf8Byte);
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}
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else if ((currentUtf8Byte&0xe0)==0xc0)
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{
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//__ASSERT_DEBUG(pointerToCurrentUtf8Byte<=pointerToLastUtf8Byte, Panic(EPanicBadUtf8Pointers4));
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if (pointerToCurrentUtf8Byte>=pointerToLastUtf8Byte)
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{
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--pointerToCurrentUnicodeCharacter;
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--pointerToCurrentUtf8Byte;
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inputIsTruncated=ETrue;
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break;
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}
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TUint currentUnicodeCharacter=((currentUtf8Byte&0x1f)<<6);
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++pointerToCurrentUtf8Byte;
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currentUtf8Byte=*pointerToCurrentUtf8Byte;
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if ((currentUtf8Byte&0xc0)==0x80)
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{
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currentUnicodeCharacter|=(currentUtf8Byte&0x3f);
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*pointerToCurrentUnicodeCharacter=STATIC_CAST(TUint16, currentUnicodeCharacter);
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}
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else
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{
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*pointerToCurrentUnicodeCharacter=replacementcharacter;
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}
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}
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else if ((currentUtf8Byte&0xf0)==0xe0)
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{
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//__ASSERT_DEBUG(pointerToCurrentUtf8Byte<=pointerToLastUtf8Byte, Panic(EPanicBadUtf8Pointers5));
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if (pointerToLastUtf8Byte-pointerToCurrentUtf8Byte<2)
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{
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--pointerToCurrentUnicodeCharacter;
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--pointerToCurrentUtf8Byte;
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inputIsTruncated=ETrue;
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break;
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}
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TUint currentUnicodeCharacter=((currentUtf8Byte&0x0f)<<12);
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++pointerToCurrentUtf8Byte;
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currentUtf8Byte=*pointerToCurrentUtf8Byte;
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if ((currentUtf8Byte&0xc0)==0x80)
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{
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currentUnicodeCharacter|=((currentUtf8Byte&0x3f)<<6);
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++pointerToCurrentUtf8Byte;
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currentUtf8Byte=*pointerToCurrentUtf8Byte;
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if ((currentUtf8Byte&0xc0)==0x80)
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{
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currentUnicodeCharacter|=(currentUtf8Byte&0x3f);
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*pointerToCurrentUnicodeCharacter=STATIC_CAST(TUint16, currentUnicodeCharacter);
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}
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else
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{
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*pointerToCurrentUnicodeCharacter=STATIC_CAST(TUint16, currentUnicodeCharacter);
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}
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}
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else
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{
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*pointerToCurrentUnicodeCharacter=replacementcharacter;
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}
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}
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else if ((currentUtf8Byte&0xf8)==0xf0)
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{
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//__ASSERT_DEBUG(pointerToCurrentUnicodeCharacter<=pointerToLastUnicodeCharacter, Panic(EPanicBadUnicodePointers9));
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if (pointerToCurrentUnicodeCharacter>=pointerToLastUnicodeCharacter)
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{
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--pointerToCurrentUnicodeCharacter;
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--pointerToCurrentUtf8Byte;
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break;
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}
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//__ASSERT_DEBUG(pointerToCurrentUtf8Byte<=pointerToLastUtf8Byte, Panic(EPanicBadUtf8Pointers6));
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if (pointerToLastUtf8Byte-pointerToCurrentUtf8Byte<3)
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{
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--pointerToCurrentUnicodeCharacter;
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--pointerToCurrentUtf8Byte;
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inputIsTruncated=ETrue;
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break;
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}
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TUint currentUnicodeCharacter=((currentUtf8Byte&0x07)<<8);
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++pointerToCurrentUtf8Byte;
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currentUtf8Byte=*pointerToCurrentUtf8Byte;
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if ((currentUtf8Byte&0xc0)==0x80)
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{
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currentUnicodeCharacter|=((currentUtf8Byte&0x3f)<<2);
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if (currentUnicodeCharacter>=0x0040)
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{
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currentUnicodeCharacter-=0x0040;
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if (currentUnicodeCharacter<0x0400)
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{
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++pointerToCurrentUtf8Byte;
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currentUtf8Byte=*pointerToCurrentUtf8Byte;
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if ((currentUtf8Byte&0xc0)==0x80)
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{
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currentUnicodeCharacter|=((currentUtf8Byte&0x30)>>4);
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*pointerToCurrentUnicodeCharacter=STATIC_CAST(TUint16, 0xd800|currentUnicodeCharacter);
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currentUnicodeCharacter=((currentUtf8Byte&0x0f)<<6);
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++pointerToCurrentUtf8Byte;
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currentUtf8Byte=*pointerToCurrentUtf8Byte;
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if ((currentUtf8Byte&0xc0)==0x80)
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{
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currentUnicodeCharacter|=(currentUtf8Byte&0x3f);
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++pointerToCurrentUnicodeCharacter;
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*pointerToCurrentUnicodeCharacter=STATIC_CAST(TUint16, 0xdc00|currentUnicodeCharacter);
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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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else
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{
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*pointerToCurrentUnicodeCharacter=replacementcharacter;
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}
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//__ASSERT_DEBUG(pointerToCurrentUtf8Byte<=pointerToLastUtf8Byte, Panic(EPanicBadUtf8Pointers7));
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//__ASSERT_DEBUG(pointerToCurrentUnicodeCharacter<=pointerToLastUnicodeCharacter, Panic(EPanicBadUnicodePointers10));
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if ((pointerToCurrentUtf8Byte>=pointerToLastUtf8Byte) || (pointerToCurrentUnicodeCharacter>=pointerToLastUnicodeCharacter))
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{
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break;
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}
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++pointerToCurrentUnicodeCharacter;
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++pointerToCurrentUtf8Byte;
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}
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if ((pointerToCurrentUtf8Byte<aUtf8.Ptr()) && inputIsTruncated)
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{
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return KErrArgument;
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}
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aUnicode.SetLength((pointerToCurrentUnicodeCharacter-aUnicode.Ptr())+1);
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return pointerToLastUtf8Byte-pointerToCurrentUtf8Byte;
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}
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