/*

* Copyright (c) 2002 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: 

*      Implementation of class CDdRecog.   

*      

*

*/

// INCLUDE FILES

#include <s32std.h>

#include <apmrec.h>

#include <apmstd.h>

#include <f32file.h>

#include <CharConv.h>

#include "DdRecog.h"

#include "DdRecogLogger.h"

// ================= CONSTANTS =======================

/// UID of DD Viewer Application.

LOCAL_D const TUid KDdUidDdViewerApp = { DD_VIEWER_UID };

/// Preferred recognition buffer size.

const TInt KPreferedBufferSize = 1024;

/// DD MIME type string.

_LIT8( KDdMimeType, DD_MIME_TYPE );

/// DD file extension.

_LIT( KDdExt,".dd" );

/// DD content recognition pattern (8 bit).

_LIT8( KDd8,"<media");

/// DD content recognition pattern (16 bit).

_LIT( KDd16,"<media");

/// DD recog ecom plugin implementation UID.

LOCAL_D const TInt KDdRecogImplementationUid = 0x10008d55;

/// ECOM implementation table.

LOCAL_D const TImplementationProxy ImplementationTable[] =

    {

    IMPLEMENTATION_PROXY_ENTRY\

        ( KDdRecogImplementationUid, CDdRecog::CreateRecognizerL )

    };

// ================= MEMBER FUNCTIONS =======================

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

// CDdRecog::CDdRecog()

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

//

CDdRecog::CDdRecog()

: CApaDataRecognizerType( KDdUidDdViewerApp, CApaDataRecognizerType::ENormal )

    {

    iCountDataTypes = 1;

    }

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

// CDdRecog::PreferredBufSize()

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

//

TUint CDdRecog::PreferredBufSize()

    {

    return KPreferedBufferSize;

    }

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

// CDdRecog::SupportedDataTypeL()

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

//

TDataType CDdRecog::SupportedDataTypeL( TInt aIndex ) const

    {

    switch ( aIndex )

        {

        case 0:

            {

            return TDataType( KDdMimeType );

            }

        default:

            {

            return TDataType();

            }

        }

    }

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

// CDdRecog::CreateRecognizerL()

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

//

CApaDataRecognizerType* CDdRecog::CreateRecognizerL()

    {

    return new (ELeave) CDdRecog();

    }

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

// CDdRecog::DoRecognizeL()

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

//

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

    {

    CLOG_ENTERFN( "CDdRecog::DoRecognizeL" );

    CLOG_WRITE_FORMAT( "DoRecognize: name: %S", &aName );

    iConfidence = ENotRecognized;

    // Check extension. We cannot use TParse* classes, as the recog is

    // called with generated filenames which contain invalid chars and

    // panic TParsePtrC.

    TInt len( KDdExt().Length() );

    if( aName.Length() >= len && !aName.Right( len ).CompareF( KDdExt ) )

        {

        CLOG_WRITE( "DoRecognize: extension is '.dd'" );

        // Named ".dd"

        iDataType = TDataType( KDdMimeType );

        iConfidence = ECertain;

        }

    else

        {

        CLOG_WRITE( "DoRecognize: pattern search" );

        // Not named ".dd". Recognition by pattern-matching.

        // Prepare pointers to buffer (both 8 and 16 bits).

        TPtrC8 buf8( aBuffer );

        if ( aBuffer.Length() > KPreferedBufferSize )

            {

            buf8.Set( aBuffer.Left( KPreferedBufferSize ) );

            }

        TPtrC buf16( (TText*)buf8.Ptr(), buf8.Length() / 2 );

        // Find DD-specific pattern in buffer (both 8 and 16 bits).

        if ( buf8.FindF( KDd8 ) >= 0 || buf16.FindF( KDd16 ) >= 0 )

            {

            iDataType = TDataType( KDdMimeType );

            iConfidence = ECertain;

            }

        }

    CLOG_WRITE_FORMAT( "DoRecognize: confidence: %d", iConfidence );

    CLOG_LEAVEFN( "CDdRecog::DoRecognizeL" );

    }

/**

* Implementation group proxy.

* @param aTableCount Table count is returned here.

* @return Implementation table is returned here.

*/

EXPORT_C const TImplementationProxy* ImplementationGroupProxy

( TInt& aTableCount )

    {

    aTableCount =

        sizeof( ImplementationTable ) / sizeof( TImplementationProxy );

    return ImplementationTable;

    }