TVerdict CHashIncrementalHashWithCopyStep::doTestStepL()
{
if (TestStepResult()==EPass)
{
//Assume faliure, unless all is successful
SetTestStepResult(EFail);
INFO_PRINTF1(_L("*** Hash - Incremental Hash with Copy ***"));
INFO_PRINTF2(_L("HEAP CELLS: %d"), User::CountAllocCells());
TVariantPtrC algorithmUid;
TVariantPtrC operationModeUid;
TPtrC sourcePath;
TPtrC expectedHash;
//Extract the Test Case ID parameter from the specified INI file
if(!GetStringFromConfig(ConfigSection(),KConfigAlgorithmUid,algorithmUid) ||
!GetStringFromConfig(ConfigSection(),KConfigOperationMode,operationModeUid) ||
!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,
operationModeUid,
NULL,
NULL));
if(hashImpl && (err == KErrNone))
{
//Push the Hash Implementation Object onto the Cleanup Stack
CleanupStack::PushL(hashImpl);
RFs 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 hashCopied = EFalse;
TPtrC8 hashStr;
CHash* hashCopyImpl = NULL;
User::LeaveIfError(sourceFile.Size(sourceLength));
//Divide the total size of the source file up into individual equal sized blocks to read
//over several increments
readIncrement = sourceLength/KDataReadBlocks;
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(hashCopyImpl->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 copied
else if((readPosition >= sourceLength/2) && (hashCopied == EFalse))
{
//Update the hash message before copying
hashImpl->Update(*sourceData);
INFO_PRINTF1(_L("Copying Hash Object..."));
//Create a Copy of the existing Hash Object and all internal state of the message digest
hashCopyImpl = hashImpl->CopyL();
hashCopied = ETrue;
INFO_PRINTF2(_L("*** HASH COPY - Bytes Read: %d ***"), readPosition);
}
else
{
//Update the message data within the Hash object with the new block
if(hashCopied == EFalse)
{
hashImpl->Update(*sourceData);
INFO_PRINTF2(_L("Hash Update - Bytes Read: %d"), readPosition);
}
else
{
hashCopyImpl->Update(*sourceData);
INFO_PRINTF2(_L("Hash Update (Copy) - 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 Hash with Copy : PASS ***"));
SetTestStepResult(EPass);
}
else
{
ERR_PRINTF2(_L("*** FAIL: Hashed and Expected Value Mismatch ***"), err);
SetTestStepResult(EFail);
}
CleanupStack::PopAndDestroy(hashResult);
CleanupStack::PopAndDestroy(hashData);
delete hashCopyImpl;
}
//Cleanup the Source RFile
CleanupStack::PopAndDestroy();
}
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();
}
