// Copyright (c) 2005-2009 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:

// Name          : SIPSyntaxCheck.cpp

// Part of       : SIP Codec

// Version       : SIP/4.0 

//

#include "SIPSyntaxCheck.h"

#include "TSIPChar.h"

#include "sipcodecerr.h"

#include <uriutils.h>

_LIT8(KSIP, "SIP");

_LIT8(KTwoDots, "..");

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::Token

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::Token (const TDesC8& aValue)

	{

	if (aValue.Length() == 0) 

		{

		return EFalse;

		}

	TLex8 lex(aValue);

	TSIPChar sipChr = lex.Get();

	while (sipChr)

		{

		if (!sipChr.IsTokenChar()) 

			{

			return EFalse;

			}

		sipChr = lex.Get();

		}

	return ETrue;

	}

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::AlphaMaxSize8

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::AlphaMaxSize8 (const TDesC8& aValue)

	{

	if (aValue.Length() == 0) 

		{

		return EFalse;

		}

	TLex8 lex(aValue);

	TSIPChar sipChr = lex.Get();

	TInt count = 1;

	while (sipChr)

		{

		if (!sipChr.IsAlpha()) 

			{

			return EFalse;

			}

		sipChr = lex.Get();

		count++;

		} 

	return (count <= 9);

	}

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::Host

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::Host (const TDesC8& aValue)

	{

    if(aValue.Length() == 0)

        {

        return EFalse;

        } 

    CSIPHostPort::TType hostType;

	return (SIPSyntaxCheck::HostType(aValue,hostType) == KErrNone);

	}

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::Word

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::Word (const TDesC8& aValue)

	{

	if (aValue.Length() == 0) 

		{

		return EFalse;

		}

	TLex8 lex(aValue);

	TSIPChar sipChr = lex.Get();

	while (sipChr)

		{

		if (!sipChr.IsWordChar()) return EFalse;

		sipChr = lex.Get();

		}

	return ETrue;

	}

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::User

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::User (const TDesC8& aUser)

	{

	if (aUser.Length() == 0) 

		{

		return EFalse;

		}

	TLex8 lex(aUser);

	TSIPChar sipChr = lex.Get();

	while (sipChr)

		{

		if (!(sipChr.IsUnreserved() || sipChr == '%' || sipChr == '&' ||

			  sipChr == '=' || sipChr == '+' || sipChr == '$' ||

			  sipChr == ',' || sipChr == ';' || sipChr == '?' ||

			  sipChr == '/'))

			{

			return EFalse;

			}

		if (sipChr == '%' && !SkipAndCheckEscaped(lex)) // escaped

			{

			return EFalse;

			}

		sipChr = lex.Get();

		}

	return ETrue;

	}

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::Password

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::Password (const TDesC8& aPassword)

	{

	if (aPassword.Length() == 0) 

		{

		return EFalse;

		}

	TLex8 lex(aPassword);

	TSIPChar sipChr = lex.Get();

	while (sipChr)

		{

		if (!(sipChr.IsUnreserved() || sipChr == '%' || sipChr == '&' ||

			  sipChr == '=' || sipChr == '+' || sipChr == '$' ||

			  sipChr == ','))

			{

			return EFalse;

			}

		if (sipChr == '%' && !SkipAndCheckEscaped(lex)) // escaped

			{

			return EFalse;

			}

		sipChr = lex.Get();

		}

	return ETrue;

	}

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::StartsAndEndsWithQuotes

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::StartsAndEndsWithQuotes (const TDesC8& aValue)

    {

	// trim and check quotes

	TLex8 lex(aValue);

	lex.SkipSpace();

	TPtrC8 trimmedVal(lex.Remainder());

	const TInt KTwoQuotesLength = 2;

	if (trimmedVal.Length() < KTwoQuotesLength) 

		{

		return EFalse;

		}

	if (trimmedVal.Locate('"') != 0) 

		{

		return EFalse;

		}

	if (trimmedVal.LocateReverse('"') != trimmedVal.Length()-1) 

		{

		return EFalse;

		}

	return ETrue;    

    }

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::QuotedString

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::QuotedString (const TDesC8& aValue)

	{

	// trim and check quotes

	TLex8 lex(aValue);

	lex.SkipSpace();

	TPtrC8 trimmedVal(lex.Remainder());

	if (!StartsAndEndsWithQuotes(trimmedVal))

	    {

	    return EFalse;

	    }

	// remove quotes

	TPtrC8 withoutFirstQuote(trimmedVal.Mid(1));

	TPtrC8 withoutQuotes(withoutFirstQuote.Left(withoutFirstQuote.Length()-1));

	// check value

	return QuotedStringValue(withoutQuotes);

	}

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::QuotedStringValue

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::QuotedStringValue(

    const TDesC8& aValue, 

    const TChar& aExtraChr)

	{

	TLex8 lex(aValue);

	TSIPChar sipChr = lex.Get();

	while (sipChr)

		{

		TBool ok = ETrue;

		if (sipChr.IsUTF8NonAsciiStartChar())

			{

			ok = SkipAndCheckNonAscii(sipChr,lex);

			}

		else if (sipChr == '\\')

			{

			sipChr = lex.Get();

			ok = sipChr.IsQuotedPairChar();

			}

		else if (sipChr.IsGdTextChar() || 

		         sipChr == ' ' || 

		         sipChr == '\t' ||

		         sipChr == aExtraChr)

			{

			ok = ETrue;

			}

		else

			{

			ok = EFalse;

			}

		if (!ok) 

			{

			return EFalse;

			}

		sipChr = lex.Get();

		}

	return ETrue;

	}	

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::SIPVersion

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::SIPVersion (const TDesC8& aValue)

	{

	// "SIP" "/" 1*DIGIT "." 1*DIGIT

	if (aValue.Length() < KSIP().Length()+4) 

		{

		return EFalse;

		}

	if (aValue.FindF(KSIP) != 0) 

		{

		return EFalse;

		}

	TLex8 lex(aValue.Mid(KSIP().Length()));

	if (lex.Get() != '/') 

		{

		return EFalse;

		}

	TSIPChar sipChr = lex.Get();

	if (!sipChr.IsDigit()) 

		{

		return EFalse;

		}

	while (sipChr.IsDigit()) 

		{

		sipChr = lex.Get();

		}

	if (sipChr != '.') 

		{

		return EFalse;

		}

	sipChr = lex.Get();

	if (!sipChr.IsDigit()) 

		{

		return EFalse;

		}

	while (sipChr.IsDigit()) 

		{

		sipChr = lex.Get();

		}

	return (sipChr == 0);

	}

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::ReasonPhrase

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::ReasonPhrase (const TDesC8& aValue)

	{

	TLex8 lex(aValue);

	TSIPChar sipChr = lex.Get();

	while (sipChr)

		{

		TBool ok = ETrue;

		if (sipChr.IsUTF8NonAsciiStartChar())

			{

			ok = SkipAndCheckNonAscii(sipChr,lex);

			}

		else if (sipChr == '%') // escaped

			{

			ok = SkipAndCheckEscaped(lex);

			}

		else if (sipChr.IsReserved() || sipChr.IsUnreserved() || 

			     sipChr.IsUTF8ContChar() || sipChr == ' ' || sipChr == '\t')

			{

			ok = ETrue;

			}

		else

			{

			ok = EFalse;

			}

		if (!ok) 

			{

			return EFalse;

			}

		sipChr = lex.Get();

		}

	return ETrue;

	}

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::UInt

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::UInt (const TDesC8& aValue)

	{

	TUint tmp=0;

	return UInt(aValue,tmp);

	}

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::UInt

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::UInt (const TDesC8& aValue, TUint& aResult)

	{

	if (aValue.Length() == 0) 

		{

		return EFalse;

		}

	TLex8 lex(aValue);

	TUint parsedValue=0;

	if (lex.Val(parsedValue) != KErrNone) 

		{

		return EFalse;

		}

	if (lex.Remainder().Length() != 0) 

		{

		return EFalse;

		}

	aResult = parsedValue;

	return ETrue;

	}

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::Real

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::Real (const TDesC8& aValue)

	{

	TReal tmp=0;

	return Real(aValue,tmp);

	}

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::Real

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::Real (const TDesC8& aValue, TReal& aResult)

	{

	if (aValue.Length() == 0) 

		{

		return EFalse;

		}

	TLex8 lex(aValue);

	TReal parsedValue=0;

	// SIP uses always dot as a decimal point

	const TChar KDotChr = '.';

	if (lex.Val(parsedValue,KDotChr) != KErrNone) 

		{

		return EFalse;

		}

	if (lex.Remainder().Length() != 0) 

		{

		return EFalse;

		}

	aResult = parsedValue;

	return ETrue;

	}

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::GenericParamValue

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::GenericParamValue (const TDesC8& aValue)

	{

	// token / host / quoted-string

	if (Token(aValue)) 

		{

		return ETrue;

		}

	if (Host(aValue)) 

		{

		return ETrue;

		}

	return QuotedString(aValue);

	}

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::QValue

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::QValue (const TDesC8& aValue)

	{

	TReal q=0;

	if (!Real(aValue,q)) 

		{

		return EFalse;

		}

	return (q >= 0 && q <= 1);

	}

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::TtlValue

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::TtlValue (const TDesC8& aValue)

	{

	const TUint KMaxTtlValue = 255;

	TUint ttl=0;

	if (!UInt(aValue,ttl)) 

		{

		return EFalse;

		}

	return (ttl <= KMaxTtlValue);

	}

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::HexValue

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::HexValue (const TDesC8& aValue, TInt aLength)

    {

	TLex8 lex(aValue);

	TSIPChar sipChr = lex.Get();

    TInt count = 0;

	while (sipChr.IsHexDigit())

		{

        count++;

		sipChr = lex.Get();

		}

    if (aLength < 0) 

        {

        count = aLength;

        }

	return (count == aLength && sipChr == 0);

    }

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::ExtensionHeaderValue

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::ExtensionHeaderValue (const TDesC8& aValue)

	{

	// CR or LF not allowed (line folds removed by pre-parser)

	if (aValue.Length() == 0) 

        {

        return ETrue;

        }

	TLex8 lex(aValue);

	TSIPChar sipChr = lex.Get();

	while (sipChr)

		{

		TBool ok = ETrue;

		if (sipChr.IsUTF8NonAsciiStartChar())

			{

			ok = SkipAndCheckNonAscii(sipChr,lex);

			}

		else if ((sipChr >= 33 && sipChr <= 126) || 

			     sipChr.IsUTF8ContChar() || 

			     sipChr == ' ' || 

			     sipChr == '\t' ||

			     sipChr == 2) // Used by Yahoo in authentication

			{	

			ok = ETrue;

			}

		else

			{

			ok = EFalse;

			}

		if (!ok) 

			{

			return EFalse;

			}

		sipChr = lex.Get();

		}

	return ETrue;

	}

// -----------------------------------------------------------------------------

// SIPSyntaxCheck::QuotedTokenWithComma

// -----------------------------------------------------------------------------

//

TBool SIPSyntaxCheck::QuotedTokenWithComma (const TDesC8& aValue)

    {

	if (!aValue.Length()) 

		{