/*

* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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: 

* Example CTestStep derived implementation

*

*/

/**

 @file

 @internalTechnology

*/

#include "hash_incremental_with_reset_step.h"

#include <cryptospi/cryptohashapi.h>

#include <cryptospi/plugincharacteristics.h>

using namespace CryptoSpi;

CHashIncrementalWithResetStep::~CHashIncrementalWithResetStep()

	{

	}

CHashIncrementalWithResetStep::CHashIncrementalWithResetStep()

	{

	SetTestStepName(KHashIncrementalWithResetStep);

	}

TVerdict CHashIncrementalWithResetStep::doTestStepPreambleL()

	{

	return EPass;

	}

TVerdict CHashIncrementalWithResetStep::doTestStepL()

	{

	//Assume faliure, unless all is successful

	SetTestStepResult(EFail);

	INFO_PRINTF1(_L("*** Hash - Incremental with Reset ***"));

	INFO_PRINTF2(_L("HEAP CELLS: %d"), User::CountAllocCells());

	TVariantPtrC algorithmUid;

	TPtrC sourcePath;

	TPtrC expectedHash;

	//Extract the Test Case ID parameter from the specified INI file

	if(!GetStringFromConfig(ConfigSection(),KConfigAlgorithmUid,algorithmUid) ||

		!GetStringFromConfig(ConfigSection(),KConfigSourcePath,sourcePath) ||

		!GetStringFromConfig(ConfigSection(),KConfigExHashHmacValue,expectedHash))

		{

		ERR_PRINTF1(_L("** Error: Failed to Load Configuration Parameters **"));

		SetTestStepResult(EFail);

		}

	else

		{

		//Create a pointer for the Hash Implementation Object

		CHash* hashImpl = NULL;

		//Retrieve a Hash Factory Object					

		TRAPD(err,CHashFactory::CreateHashL(hashImpl,

											algorithmUid,

											NULL));  	

		if(err == KErrNone)

			{

			//Push the Hash Implementation Object onto the Cleanup Stack

			CleanupStack::PushL(hashImpl);

			RFs fsSession;

			CleanupClosePushL(fsSession);

			//Create a connection to the file server	

			err = fsSession.Connect();

			if(err != KErrNone)

				{

				ERR_PRINTF2(_L("*** Error: File Server Connection - %d ***"), err);

				SetTestStepResult(EFail);

				}	

			else

				{

				RFile sourceFile;

				CleanupClosePushL(sourceFile);

    			//Open the specified source file		

    			err = sourceFile.Open(fsSession,sourcePath, EFileRead);

    			if(err != KErrNone)

					{

					ERR_PRINTF2(_L("*** Error: Opening Source File - %d ***"), err);

					SetTestStepResult(EFail);

					}

				else

					{

					TInt sourceLength = 0;

					TInt readPosition = 0;

					TInt readIncrement = 0;

					TBool hashComplete = EFalse;

					TBool hashReset = EFalse;

					TPtrC8 hashStr;

					User::LeaveIfError(sourceFile.Size(sourceLength));

					//Divide the file size into seperate incremental blocks to read

					readIncrement = sourceLength/KDataReadBlocks;

					if (readIncrement == 0)

						{

						ERR_PRINTF2(_L("*** Error: Source File must be larger than %d bytes ***"), KDataReadBlocks);

						User::LeaveIfError(KErrNotSupported);

						}

					do 

						{

						//Create a heap based descriptor to store the data

						HBufC8* sourceData = HBufC8::NewL(readIncrement);

						CleanupStack::PushL(sourceData);

						TPtr8 sourcePtr = sourceData->Des();

						//Read in a block of data from the source file from the current position

						err = sourceFile.Read(readPosition,sourcePtr,readIncrement);

						//Update the read position by adding the number of bytes read

						readPosition += readIncrement;

						if(readPosition == readIncrement)

							{

							//Read in the first block from the data file into the Hash implementation object

							hashImpl->Hash(*sourceData);

							INFO_PRINTF2(_L("Intial Hash - Bytes Read: %d"), readPosition);

							}

						else if(readPosition >= sourceLength)

							{

							//Reading in the final block, constructs the complete hash value and returns it within a TPtrC8

							hashStr.Set(hashImpl->Final(*sourceData));

							//Sets the Complete Flag to ETrue in order to drop out of the loop

							hashComplete = ETrue;

							TInt totalRead = (readPosition - readIncrement) + (*sourceData).Length();

							INFO_PRINTF2(_L("Final Hash - Bytes Read: %d"),totalRead);

							}

						//If the read position is half the source length and the implementation

						//object hasn't already been reset

						else if((readPosition >= sourceLength/2) && (hashReset == EFalse))

							{

							INFO_PRINTF1(_L("Resetting Hash Object..."));

							hashImpl->Reset();

							//Sets the read position back to 0 inorder to restart the file read from the beginning

							readPosition = 0;

							hashReset = ETrue;

							INFO_PRINTF2(_L("*** HASH RESET - Bytes Read: %d ***"), readPosition);

							}

						else

							{

							//Update the message data within the Hash object with the new block

							hashImpl->Update(*sourceData);

							INFO_PRINTF2(_L("Hash Update - Bytes Read: %d"), readPosition);	

							}

						CleanupStack::PopAndDestroy(sourceData);

						}while(hashComplete == EFalse);

					//Create a NULL TCharacteristics pointer

					const TCharacteristics* charsPtr(NULL);

					//Retrieve the characteristics for the hash implementation object

					TRAP_LOG(err, hashImpl->GetCharacteristicsL(charsPtr));

					//Static cast the characteristics to type THashCharacteristics

					const THashCharacteristics* hashCharsPtr = static_cast<const THashCharacteristics*>(charsPtr);

					//The hash output size is returned in Bits, divide by 8 to get the Byte size

					TInt hashSize = hashCharsPtr->iOutputSize/8;

					//Retrieve the final 8bit hash value and convert to 16bit												

					HBufC* hashData = HBufC::NewLC(hashSize);

					TPtr hashPtr = hashData->Des();

					//Copy the hashed content into the heap based descriptor

					hashPtr.Copy(hashStr);

				 	//Take the 16bit descriptor and convert the string to hexadecimal

					TVariantPtrC convertHash;

					convertHash.Set(hashPtr);

					HBufC* hashResult = convertHash.HexStringLC();

					INFO_PRINTF2(_L("*** Hashed Data: %S ***"),&*hashResult);

					INFO_PRINTF2(_L("*** Expected Hash: %S ***"),&expectedHash);

					//If the returned hash value matches the expected hash, Pass the test	

					if(*hashResult == expectedHash)

						{

						INFO_PRINTF1(_L("*** Hash - Incremental with Reset : PASS ***"));

						SetTestStepResult(EPass);	

						}

					else

						{

						ERR_PRINTF2(_L("*** FAIL: Hashed and Expected Value Mismatch  ***"), err);

						SetTestStepResult(EFail);	

						}

					CleanupStack::PopAndDestroy(2, hashData);	// hashResult, hashData	

					}

				//Cleanup the Source RFile	

				CleanupStack::PopAndDestroy();	

				}

			CleanupStack::PopAndDestroy(&fsSession);

			fsSession.Close();	

			CleanupStack::PopAndDestroy(hashImpl);

			}

		else

			{

			ERR_PRINTF2(_L("*** FAIL: Failed to Create Hash Object - %d ***"), err);

			SetTestStepResult(EFail);	

			}				

		}

	INFO_PRINTF2(_L("HEAP CELLS: %d"), User::CountAllocCells());

	return TestStepResult();

	}

TVerdict CHashIncrementalWithResetStep::doTestStepPostambleL()

	{

	return TestStepResult();

	}