// Copyright (c) 2007-2009 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:

//

/**

 @file

 @internalComponent

 @released

*/

#include "avrcpfragmenter.h"

#include "controlcommand.h"

#include <e32debug.h>

// Maximum size of data in a fragment response

static const int KFragmentDataLength = KAVCMaxVendorDependentPayload - KAVRCPMinVendorDependentResponseLen;

CAVRCPFragmenter* CAVRCPFragmenter::NewL()

	{

	CAVRCPFragmenter* self = new (ELeave) CAVRCPFragmenter();

	self->Construct();

	return self;

	}

TBool CAVRCPFragmenter::InFragmentedState()

	{

	return iInFragmentedState;

	}

void CAVRCPFragmenter::Reset()

	{

	iStart = KAVRCPMinVendorDependentResponseLen;

	iInFragmentedState = EFalse;

	}

void CAVRCPFragmenter::AssignPayload(const RBuf8& aPayload)

	{

	// Assign the allocated memory containing the reponse to

	// this class, allowing the caller to Close() aPayload.

	iPayload.Close();

	iPayload.Assign(aPayload);

	iInFragmentedState = ETrue;

	}

TPtr8 CAVRCPFragmenter::GetNextFragmentHeader()

	{

	if (! InFragmentedState())

		return TPtr8(0,0,0);

	// Fragmentation byte is 2nd byte of response; poke this

	// and set the length correctly

	if (iStart == KAVRCPMinVendorDependentResponseLen)

		{

		iPayload[1] = EFragmentStart;

		iPayload[2] = (KFragmentDataLength >> 8) & 0xff;

		iPayload[3] = (KFragmentDataLength) & 0xff;

		}

	else if (LastFragment())

		{

		iPayload[1] = EFragmentEnd;

		TInt length = iPayload.Length() - iStart;

		iPayload[2] = (length >> 8) & 0xff;

		iPayload[3] = (length) & 0xff;

		}

	else

		{

		iPayload[1] = EFragmentContinue;

		iPayload[2] = (KFragmentDataLength >> 8) & 0xff;

		iPayload[3] = (KFragmentDataLength) & 0xff;

		}

	// Return the first 4 bytes, which contain the PDU id,

	// fragmentation status and parameter length (2 bytes)

	return iPayload.MidTPtr(0, KAVRCPMinVendorDependentResponseLen);

	}

TPtr8 CAVRCPFragmenter::GetNextFragment()

	{

	if (! InFragmentedState())

		return TPtr8(0,0,0);

	// Sigh. MidTPtr() PANICs if the 2nd argument is too large.

	// Other APIs (e.g. Java, STL) just return to end of string.

	TInt fragmentSize = KFragmentDataLength;

	if (LastFragment())

		fragmentSize = iPayload.Length() - iStart;

	TPtr8 fragment = iPayload.MidTPtr(iStart, fragmentSize);

	if (LastFragment())

		Reset();

	else

		iStart += fragmentSize;

	return fragment;

	}

TBool CAVRCPFragmenter::LastFragment()

	{

	if (iStart + KFragmentDataLength > iPayload.Length())

		return ETrue;

	else

		return EFalse;

	}

TInt CAVRCPFragmenter::GetPDU()

	{

	return iPayload[0];

	}

void CAVRCPFragmenter::Construct()

	{

	Reset();

	}