/*

* Copyright (c) 2003-2010 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: 

*

*/

#include <s32file.h>

#include <ecom/ecom.h>

#include <ecom/implementationproxy.h>

#include "resolver.h"

#include "mimetypemapping.h"

#include "CafApaRecognizer.h"

using namespace ContentAccess;

CApaCafRecognizer* CApaCafRecognizer::NewL()

	{

	CApaCafRecognizer* self;

	self = new (ELeave) CApaCafRecognizer();

	CleanupStack::PushL(self);

	self->ConstructL();

	CleanupStack::Pop(self);

	return self;

	}

void CApaCafRecognizer::ConstructL()

	{

	iResolver = CAgentResolver::NewL(ETrue);

	SetupContentTypesL();

	}

CApaCafRecognizer::CApaCafRecognizer() : 

	CApaDataRecognizerType(KUidCafApaRecognizer, CApaDataRecognizerType::ELow)

	{

	// Assume initially we don't recognize any data types (ie. no agents)

	iCountDataTypes = 0;

	}

CApaCafRecognizer::~CApaCafRecognizer()

	{

	iContentTypes.ResetAndDestroy();

	delete iResolver;

	}

void CApaCafRecognizer::SetupContentTypesL()

	{

	// Construct the array used to map content types to our drm mime types

	CMimeTypeMapping* mimeType; 

	// The RecCaf configuration file is just a list of content mime types

	// CApaCafRecognizer expects each mime type to be on a separate line

	// The configuration file is stored in the Apparc server's private directory.

	// This should be ok since the recognizer is run in the apparc servers process

	// ROM file

	_LIT(KRomConfigurationFile, "Z:\\private\\10003A3F\\RecCaf\\RecCafMimeTypes.txt");

	// System drive file	

	_LIT(KConfigurationFile, "_:\\private\\10003A3F\\RecCaf\\RecCafMimeTypes.txt");

	TBuf<47> sysDriveConfigFile(KConfigurationFile);

	sysDriveConfigFile[0] = 'A' + static_cast<TInt>(RFs::GetSystemDrive());

	RFs fs;

	User::LeaveIfError(fs.Connect());

	CleanupClosePushL(fs);

	RFile file;

	TInt result = file.Open(fs, sysDriveConfigFile, EFileRead | EFileStream | EFileShareAny);

	if (result != KErrNone)

		{

		result = file.Open(fs, KRomConfigurationFile(), EFileRead | EFileStream | EFileShareAny);

		}

	if (result == KErrNone)

		{

		CleanupClosePushL(file);

		// create file stream

		RFileReadStream inputFileStream(file);

	    CleanupClosePushL(inputFileStream);

		TBuf8 <KMaxDataTypeLength> buf;

		do

			{

			// Read a content mime type from the file

			result = ReadLine(inputFileStream, buf);

			if (result == KErrNone || result == KErrEof)

				{

				// Add a new entry into the array of mime types

				if (buf.Length())

					{

					// force to lower case to ensure that chosen lower case scheme for mime

					// types is maintained

					buf.LowerCase();

					mimeType = CMimeTypeMapping::NewL(buf);

					CleanupStack::PushL(mimeType);

					User::LeaveIfError(iContentTypes.Append(mimeType));

					CleanupStack::Pop(mimeType); 

					}

				}

			else

				{

				// Encountered an error reading the file

				// don't know how to recover so leave

				iContentTypes.ResetAndDestroy();

				User::Leave(result);

				}

			} while (result != KErrEof);

		CleanupStack::PopAndDestroy(2, &file); // inputFileStream, file

		}

	CleanupStack::PopAndDestroy(&fs);

	// Add multiple content object file mime type

	_LIT8(KApplicationXCafStr, "application/x-caf");

	mimeType = CMimeTypeMapping::NewL(KApplicationXCafStr());

	CleanupStack::PushL(mimeType);

	User::LeaveIfError(iContentTypes.Append(mimeType));

	CleanupStack::Pop(mimeType); 

	// Add supplier Mime types 

	// otherwise nobody will recognize unprocessed files 

	// that could be churned through the CAF Supplier API

	// The resolver ensures that its supplier mime types are lower case

	for(TInt index = 0; index < iResolver->SupplierMimeTypes().Count(); index++)

		{

		mimeType = CMimeTypeMapping::NewL(iResolver->SupplierMimeTypes()[index],

										  iResolver->SupplierMimeTypes()[index]);

		CleanupStack::PushL(mimeType);

		User::LeaveIfError(iContentTypes.Append(mimeType));

		CleanupStack::Pop(mimeType); 

		}

	iCountDataTypes = iContentTypes.Count();

	}

TInt CApaCafRecognizer::ReadLine(RFileReadStream& aInStream, TDes8& aBuffer)

	{

	const TChar KCarriageReturn = '\r';

	const TChar KLineFeed = '\n';

	// Clear the buffer

	aBuffer.SetLength(0);

	// Read line upto linefeed delimiter

	TRAPD(err, aInStream.ReadL(aBuffer, KLineFeed));

	TInt length = aBuffer.Length();

	// assume all lines must end in CRLF and do not 

	// allow blank lines. So length must be at least 2 for

	// the CRLF characters

	if(length < 3)

		{

		err = KErrEof;

		}

	if (err == KErrNone)

		{

		// remove line feed and any carriage return 

		if (aBuffer[length - 1] == KLineFeed)

			{

			--length;

			}

		if (aBuffer[length - 1] == KCarriageReturn)

			{

			--length;

			}

		aBuffer.SetLength(length);

		}

	return err;

	}

TUint CApaCafRecognizer::PreferredBufSize()

	{

	// Ask all of the agents if they have a preferred buffer size for calls to DoRecognizeL()

	return iResolver->PreferredBufferSize();

	}

TDataType CApaCafRecognizer::SupportedDataTypeL(TInt aIndex) const

	{

	// leave if an out of range aIndex is supplied

	if (aIndex < 0 || aIndex >= iContentTypes.Count())

		{

		User::Leave(KErrArgument);

		}

	return TDataType(iContentTypes[aIndex]->CafMimeType());

	}

void CApaCafRecognizer::DoRecognizeL(const TDesC& aName, const TDesC8& aBuffer)

	{

	TBuf8 <KMaxDataTypeLength> FileMimeType;

	TBuf8 <KMaxDataTypeLength> ContentMimeType;

	// Need to start by assuming we don't recognize the file

	iConfidence = ENotRecognized;

	TBool isRecognized = EFalse;

	// If aName is prepended with 2 colons (::), then it is not valid, and we need to

	// derive it from the file handle. Otherwise, we assume that aName is valid

	if (aName.Match(_L("::*")) == KErrNotFound)

		{

		isRecognized = iResolver->DoRecognizeL(aName, aBuffer, FileMimeType, ContentMimeType);

		}

	// aName is not a valid URI/filename and a file handle must be used. This is marked

	// by two colons at the start of aName.

	// We need to get the actual file name from the file handle.

	else 

		{

		RFile* fileHandle = CApaCafRecognizer::FilePassedByHandleL();

		if( fileHandle == NULL )

		{

			return;

		}

		TBuf<KMaxDataTypeLength> fileName;

		User::LeaveIfError(fileHandle->Name(fileName));

		isRecognized = iResolver->DoRecognizeL(fileName, aBuffer, FileMimeType, ContentMimeType);

		}

	if (isRecognized == EFalse)

	{

		return;

	}

	// If there is no content type but the file is recognized it is assumed

	// to be a file that can be processed through the supplier interface

	// dummy object for comparison in match function

	CMimeTypeMapping* mimeTypeMapping = (ContentMimeType.Length() == 0) ?  

										 CMimeTypeMapping::NewL(FileMimeType) :

										 CMimeTypeMapping::NewL(ContentMimeType);

	// check that the content mime type is one of the ones we

	// told Apparc we can recognize in the beginning

	// The mime type should always be found as the file has been recognised.

	// If not it is because an agent, when recognising the file, has set a mime type not in its supplier list.

	// Mime types are always forced to lower case therefore this match can be case sensitive.

	TInt index = iContentTypes.Find(mimeTypeMapping, CMimeTypeMapping::ContentMimeTypeMatch);

	if (index != KErrNotFound)

	{

	    iDataType = TDataType(iContentTypes[index]->CafMimeType());

		iConfidence=ECertain;

	}

	delete mimeTypeMapping;

	}

const TImplementationProxy ImplementationTable[] = 

	{

	IMPLEMENTATION_PROXY_ENTRY(0x102031E9, CApaCafRecognizer::NewL)

	};

EXPORT_C const TImplementationProxy* ImplementationGroupProxy(TInt& aTableCount)

	{

	aTableCount = sizeof(ImplementationTable) / sizeof(TImplementationProxy);

	return ImplementationTable;

	}