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// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#include <apmrec.h>
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#include <apmstd.h>
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#include "RECTXT.H"
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#include <ecom/implementationproxy.h>
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const TUid KUidMimeTxtRecognizer={0x100012FB};
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const TInt KMinBufferLength=42; // minimum amount of file needed to determine a text file IF it's not called .TXT
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const TInt KMaxBufferLength=1024; // maximum amount of buffer space we will ever use
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_LIT8(KDataTypeTextPlain,"text/plain");
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_LIT(KTextFileExt,".txt");
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CApaTextRecognizer::CApaTextRecognizer()
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:CApaDataRecognizerType(KUidMimeTxtRecognizer,CApaDataRecognizerType::ELow)
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// Text files are low recognition - they don't have a clear signature
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{
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iCountDataTypes=1;
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}
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TUint CApaTextRecognizer::PreferredBufSize()
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{
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return KMaxBufferLength;
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}
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#if defined(_DEBUG)
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TDataType CApaTextRecognizer::SupportedDataTypeL(TInt aIndex) const
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#else
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TDataType CApaTextRecognizer::SupportedDataTypeL(TInt /*aIndex*/) const
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#endif
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{
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__ASSERT_DEBUG(aIndex==0,User::Invariant());
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return TDataType(KDataTypeTextPlain);
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}
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void CApaTextRecognizer::DoRecognizeL(const TDesC& aName, const TDesC8& aBuffer)
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{
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TBool nameRecognized=EFalse;
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// check if the file has valid UIDs
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if (aBuffer.Length() >= 16)
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{
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// if the first 3 bytes are valid UIDs,then this file is not a plain/text.
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// Set iConfidence appropriately and exit.
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const TCheckedUid checkUid(aBuffer.Left(16));
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if (checkUid.UidType().IsValid())
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{
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iConfidence=ENotRecognized;
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return;
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}
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}
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if (aName.Length()>4)
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{
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nameRecognized=(aName.Right(4).CompareF(KTextFileExt)==0);
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}
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const TInt length=Min(aBuffer.Length(), KMaxBufferLength);
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if (length<KMinBufferLength && !nameRecognized)
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return;
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TInt ii;
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for (ii=0; ii<length; ii++)
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{
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const TUint chr=aBuffer[ii];
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// these are guesses of what WON'T be in a text file
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if (chr<9 || chr==11 || chr==12 || (chr>13 && chr<32))
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{
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break;
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}
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if (chr>148)
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{
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break;
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}
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}
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const TBool validChars=(ii==length);
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if (nameRecognized)
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{
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iConfidence=validChars? EProbable : EUnlikely;
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}
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else
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{
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if (!validChars)
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{
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return;
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}
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iConfidence=EPossible;
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}
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iDataType=TDataType(KDataTypeTextPlain);
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}
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CApaDataRecognizerType* CApaTextRecognizer::CreateRecognizerL()
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{
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return new (ELeave) CApaTextRecognizer();
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}
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const TImplementationProxy ImplementationTable[] =
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{
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IMPLEMENTATION_PROXY_ENTRY(0x101F7DA0,CApaTextRecognizer::CreateRecognizerL)
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};
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EXPORT_C const TImplementationProxy* ImplementationGroupProxy(TInt& aTableCount)
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{
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aTableCount = sizeof(ImplementationTable) / sizeof(TImplementationProxy);
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return ImplementationTable;
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}
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