// Copyright (c) 1997-2009 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:

// See 6.7 in http://www.ietf.org/rfc/rfc2045.txt

// 

//

#include <e32svr.h>

#include <conarc.h>

#include <s32file.h>

#include <e32std.h>

#include <e32uid.h>

#include <u32hal.h>

#include "QPCONV.H"

// The ASCII character '#' is not encoded into quoted printable format. If it is present along with

// the phone number, it gets converted to its corresponding character '=23'. This makes a bit difficult

// for the user to identify the exact phone number from a VCard file. Hence the encoding is not performed.

#define KLineFeed 10

#define KCarriageReturn 13

#define KEquals '='

#define KSpace ' '

#define KTab 9

#define KExclamationPoint '!'

#define KTilde 0x7E

#define KDoubleQuotes  0x22

#define KDollarSign    0x24

#define KAtSign    0x40

#define KSquareBracketOpen    0x5B

#define KBackSlash    0x5C

#define KSquareBracketClose    0x5D

#define KCircumflex    0x5E

#define KSingleQuote    0x60

#define KCurlyBracketOpen    0x7B

#define KOrOperatorSign    0x7C

#define KCurlyBracketClose    0x7D

#define KQuotedPrintableNewLine _L8("=\r\n")

#define KQuotedPrintableCarriageReturn _L8("=0D")

#define KQuotedPrintableLineFeed _L8("=0A")

// Patchable const data value defined in conarc.cpp

IMPORT_C extern const TInt KEnableAllSplCharForQpCnv;

//

// class CQpToTxtCnv

// 

void CQpToTxtCnv::ConvertObjectAL(RReadStream& aReadStream, RWriteStream& aWriteStream,MConverterUiObserver* /*aObserver*/)

	{

	iReadStream = &aReadStream;

	iWriteStream = &aWriteStream;

	iBufferPos = 0;

	iBuffer.SetMax();

	}

TBool CQpToTxtCnv::DoConvertL()

	{

	// Check if we need to move out the oldest charcter

	if (iBufferPos == 3)

		{

		iBuffer[0] = iBuffer[1];

		iBuffer[1] = iBuffer[2];

		iBufferPos = 2;

		}

	TBuf8<1> character;

	TRAPD(err, iReadStream->ReadL(character));

	if (err == KErrEof)

		{

		// Write what we have in the buffer, and exit

		iWriteStream->WriteL(iBuffer, iBufferPos);

		return EFalse;

		}

	else if (err == KErrNone)

		{

		iBuffer[iBufferPos] = character[0];

		iBufferPos++;

		if (iBufferPos == 3)

			{

			// Check that we have three characters to compare:

			if (iBuffer[0] == KEquals)

				{

				// Check for special QP codes

				if (!(iBuffer[1] == KCarriageReturn && iBuffer[2] == KLineFeed))

					{

					// act on the code

					TLex8 lex(iBuffer);

					TUint code;

					(void)lex.Get(); // skip the equals

					lex.Val(code,EHex);

					iWriteStream->WriteUint8L(STATIC_CAST(TUint8,code));

					}

				iBufferPos=0;

				}

			else if (iBuffer[1] == KCarriageReturn && iBuffer[2] == KLineFeed)

				{

				// throw away these characters

				iBufferPos=0;

				}

			else

				{

				// Write out the last character in the stream

				iWriteStream->WriteUint8L(iBuffer[0]);

				}

			}

		}

	else

		{

		// Some other error, let's clear up and go home

		return EFalse;

		}

	return ETrue;

	}

TUid CQpToTxtCnv::Uid()

	{

	return KUidQuotedPrintableToText;

	}

TInt CQpToTxtCnv::Capabilities()

	{

	return EConvertsObjects;

	}

CQpToTxtCnv::CQpToTxtCnv()

	{}

//

// class CTxtToQpCnv

// 

void CTxtToQpCnv::ConvertObjectAL(RReadStream& aReadStream, RWriteStream& aWriteStream,MConverterUiObserver* /*aObserver*/)

	{

	iReadStream = &aReadStream;

	iWriteStream = &aWriteStream;

	iLineLen = 0;

	}

TBool CTxtToQpCnv::DoConvertL()

	{

	TBuf8<1> character;

	TRAPD(err, iReadStream->ReadL(character));

	if (err == KErrNone)

		{

		switch (character[0])

			{

		case KCarriageReturn:

			iWriteStream->WriteL(KQuotedPrintableCarriageReturn);

			iLineLen += 3;

			break;

		case KLineFeed:

			iWriteStream->WriteL(KQuotedPrintableLineFeed);

			iLineLen += 3;

			break;

		case KEquals:

		case KTab:

		case KSpace:

			{

			FormatAndWriteBufferL(character);

			}

			break;

		case KExclamationPoint:

		case KTilde:

		case KDoubleQuotes:

		case KDollarSign:

		case KAtSign:

		case KSquareBracketOpen:

		case KBackSlash:

		case KSquareBracketClose:

		case KCircumflex:

		case KSingleQuote:

		case KCurlyBracketOpen:

		case KOrOperatorSign:

		case KCurlyBracketClose:

			{

			if (iEnableAllSplCharForQpCnv)

				{

				FormatAndWriteBufferL(character);

				}

			else

				{

				WriteBufferL(character);

				}

			}

			break;

		default:

			if( character[0] > KQuotedPrintableConvertAbove )

				{

				FormatAndWriteBufferL(character);

				}

			else

				{

				WriteBufferL(character);

				}

			break;

			}

		// Check to see if the line is getting too long

		if (iLineLen > 70)

			{

			iWriteStream->WriteL(KQuotedPrintableNewLine);

			iLineLen = 0;

			}

		return ETrue;

		}

	else

		{

		// Exit on end of stream

		return EFalse;

		}

	}

void CTxtToQpCnv::FormatAndWriteBufferL(TDes8& aChar)

	{

	TBuf8<3> buf;

	buf.Format(_L8("=%02X"),STATIC_CAST(TUint,aChar[0])); // RFC 2045 states "Uppercase letters must be used; lowercase letters are not allowed", hence the capital 'X' in this format descriptor to the statement

	iWriteStream->WriteL(buf);

	iLineLen+=3;

	}

void CTxtToQpCnv::WriteBufferL(TDes8& aChar)

	{

	iWriteStream->WriteL(aChar);

	iLineLen++;

	}

TUid CTxtToQpCnv::Uid()

	{

	return KUidTextToQuotedPrintable;

	}

TInt CTxtToQpCnv::Capabilities()

	{

	return EConvertsObjects;

	}

CTxtToQpCnv::CTxtToQpCnv():iEnableAllSplCharForQpCnv(KEnableAllSplCharForQpCnv)

	{

#ifdef __WINS__

	// KEnableAllSplCharForQpCnv is a Rom patchable constant, so patch for emulator builds can be done by

	// adding "patchdata_conarc_dll_KEnableAllSplCharForQpCnv X" to epoc.ini file.

	// When X is set to non zero, the conversion is performed for all the special characters.

	// When X is set to zero, no conversion is performed in case of the special characters.

	// Requires licensees to set the patch data value in epoc.ini file.

	TInt valueOfKEnableAllSplCharForQpCnv = 0;

	if (UserSvr::HalFunction(EHalGroupEmulator,EEmulatorHalIntProperty,(TAny*)"patchdata_conarc_dll_KEnableAllSplCharForQpCnv",&valueOfKEnableAllSplCharForQpCnv) == KErrNone)

		{

		iEnableAllSplCharForQpCnv = valueOfKEnableAllSplCharForQpCnv;

		}

#endif

	}