--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/filehandling/htmltorichtextconverter/src/CHtmlToCrtConvBuffer.cpp	Tue Feb 02 10:12:00 2010 +0200
@@ -0,0 +1,184 @@
+// Copyright (c) 2001-2009 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:
+//
+
+#include "CHtmlToCrtConvBuffer.h"
+#include "CHtmlToCrtConvAssertDefines.h"
+
+const TInt KReadBufferSize = 256;
+
+CHtmlToCrtConvBuffer::CHtmlToCrtConvBuffer(CCnvCharacterSetConverter& aCnvCharacterSetConverter)
+:iCnvCharacterSetConverter(aCnvCharacterSetConverter)
+	{
+	}
+
+CHtmlToCrtConvBuffer* CHtmlToCrtConvBuffer::NewL(const TDesC& aFile, RFs& aFsSession, CCnvCharacterSetConverter& aCnvCharacterSetConverter)
+	{
+	CHtmlToCrtConvBuffer* self=new(ELeave) CHtmlToCrtConvBuffer(aCnvCharacterSetConverter);
+	CleanupStack::PushL(self);
+	self->ConstructL(aFile, aFsSession);
+	CleanupStack::Pop(self);
+	return self;
+	}
+
+void CHtmlToCrtConvBuffer::ConstructL(const TDesC& aFile, RFs& aFsSession)
+	{
+	User::LeaveIfError(iFile.Open(aFsSession, aFile, EFileShareReadersOnly));
+	iSourceBuffer=HBufC8::NewL(KReadBufferSize);
+	iUnicodeBuffer=HBufC16::NewL(KReadBufferSize);
+	}
+
+CHtmlToCrtConvBuffer::~CHtmlToCrtConvBuffer()
+	{
+	iFile.Close();
+	delete iSourceBuffer;
+	delete iUnicodeBuffer;
+	}
+
+//===================================================================================================
+//ReadCharacterL - returns EFalse if no character read, ie when end of file and end of buffer reached
+//===================================================================================================
+TBool CHtmlToCrtConvBuffer::ReadCharacterL(TChar& aCharacter, TInt& aBufferPosition, TBool& aEndOfBuffer)
+	{
+	ASSERT((iBufferPosition>=0 && iBufferPosition<=KReadBufferSize));
+
+	aEndOfBuffer=EFalse;
+	if (iBufferPosition < iUnicodeBuffer->Length())
+		//character in buffer
+		{
+		aBufferPosition=iBufferPosition;
+		aCharacter=(*iUnicodeBuffer)[iBufferPosition++];
+		if (iBufferPosition==iUnicodeBuffer->Length())
+			{
+			aEndOfBuffer=ETrue;
+			}
+		return ETrue;
+		}
+	else
+		//no characters remaining in buffer
+		{
+		aBufferPosition=0;
+		if (FillBufferL())
+			//file was not empty
+			{
+			aCharacter=(*iUnicodeBuffer)[iBufferPosition++];
+			if (iBufferPosition==iUnicodeBuffer->Length())
+				{
+				aEndOfBuffer=ETrue;
+				}
+			return ETrue;
+			}
+		else
+			//file was empty
+			{
+			aEndOfBuffer=ETrue;
+			return EFalse;
+			}
+		}
+	}
+
+void CHtmlToCrtConvBuffer::GetPartOfBufferL(TPtrC16& aPartOfBuffer, TInt aStartPosition, TInt aEndPosition) const
+	{
+	TPtrC16 partOfBuffer(iUnicodeBuffer->Mid(aStartPosition,(aEndPosition - aStartPosition + 1)));
+	aPartOfBuffer.Set(partOfBuffer);
+	}
+
+void CHtmlToCrtConvBuffer::GetToEndOfBufferL(TPtrC16& aPartOfBuffer, TInt aStartPosition) const
+	{
+	TPtrC16 partOfBuffer(iUnicodeBuffer->Mid(aStartPosition));
+	aPartOfBuffer.Set(partOfBuffer);
+	}
+
+void CHtmlToCrtConvBuffer::GetSampleOfTextFromFileL(TDes8& aSample, TInt aLength, TInt aOffset)
+	{
+	TInt fileSize=0;
+	User::LeaveIfError(iFile.Size(fileSize));
+
+	//adjust aOffset - used to get sample of text from file, so should read aLength chars
+	if(fileSize<aLength)
+		aOffset=0;
+	else if(fileSize<aOffset+aLength)
+		aOffset=fileSize-aLength;
+
+	User::LeaveIfError(iFile.Read(aOffset, aSample, aLength));
+	ResetL();
+	}
+
+void CHtmlToCrtConvBuffer::ResetL()
+	{
+	//set read file position to start of file
+	TInt pos=0;
+	User::LeaveIfError(iFile.Seek(ESeekStart, pos));
+	}
+
+TBool CHtmlToCrtConvBuffer::FillBufferL()
+	{
+	iBufferPosition = 0;
+	//iSourceBuffer contains any remaining unconverted characters from last call to ConvertToUnicode.
+	TPtr8 sourcePtr(iSourceBuffer->Des());
+	TInt sourceLength=iSourceBuffer->Length();
+	TBool endOfFileReached=EFalse;
+
+	//newBuffer gets characters from the file to fill the remaining space in iSourceBuffer
+	HBufC8* newBuffer=HBufC8::NewLC(KReadBufferSize-sourceLength);
+	TPtr8 newBufferPtr(newBuffer->Des());
+	User::LeaveIfError(iFile.Read(newBufferPtr, KReadBufferSize-sourceLength));
+	sourcePtr.Append(newBufferPtr);
+	CleanupStack::PopAndDestroy(newBuffer);
+
+	sourceLength=sourcePtr.Length();
+	if(sourceLength < KReadBufferSize)
+		{
+		endOfFileReached=ETrue;
+		if(sourcePtr.Length()==0)
+			{
+			return EFalse;
+			}
+		}
+
+	TPtr16 unicodePtr(iUnicodeBuffer->Des());
+	unicodePtr.Zero();
+
+	DoConvertBufferL(sourcePtr, unicodePtr, sourceLength, endOfFileReached);
+
+	return ETrue;
+	}
+
+//=============================================================================
+//DoConvertBufferL - sets iUnicodeBuffer to contain the converted characters,
+//and iSourceBuffer to contain only the unconverted characters.
+//=============================================================================
+void CHtmlToCrtConvBuffer::DoConvertBufferL(TPtr8& aSourcePtr, TPtr16& aUnicodePtr, TInt& aSourceLength, TBool& aEndOfFile)
+	{
+	HBufC16* tempUnicode=HBufC16::NewLC(aSourceLength);
+	TPtr16 tempUnicodePtr(tempUnicode->Des());
+
+	//returnValue = number of unconverted characters at end of buffer
+	TInt returnValue=iCnvCharacterSetConverter.ConvertToUnicode(tempUnicodePtr, aSourcePtr, iState);
+
+	if(!aEndOfFile)
+		{
+		if(returnValue==CCnvCharacterSetConverter::EErrorIllFormedInput)
+			User::Leave(KErrCorrupt);
+		}
+	if(returnValue<0)//future-proof against 'TError' expanding
+		User::Leave(KErrGeneral);
+
+	aUnicodePtr.Append(tempUnicodePtr);
+	CleanupStack::PopAndDestroy(tempUnicode);
+	
+	//set iSourceBuffer to contain only the unconverted characters
+	aSourcePtr.Copy(aSourcePtr.Right(returnValue));
+	aSourceLength=aSourcePtr.Length();
+	}