--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/phonebookengines_old/contactsmodel/tsrc/T_rndutils.cpp	Fri Jun 11 13:29:23 2010 +0300
@@ -0,0 +1,188 @@
+// Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "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 "T_rndutils.h"
+
+const TInt KMaxWordLength =  64 ;
+const TInt KMaxNgramSize = 8;
+
+void CWordNgrams::ConstructL(const TDesC& aFilename, const TInt  aN, TBool aUseNarrowChar)
+	{
+	ASSERT(aN<KMaxNgramSize && aN>0);
+	
+	RFs fsSession;
+	RFileReadStream fileStream;
+	User::LeaveIfError(fsSession.Connect());
+	CleanupClosePushL(fsSession);
+	User::LeaveIfError(fileStream.Open(fsSession, aFilename, EFileRead));
+	CleanupClosePushL(fileStream);
+	TUint number = 0;
+	TBuf8<KMaxNgramSize> ngram8;
+#ifdef _UNICODE
+	TBuf<KMaxNgramSize> ngram;
+#else
+#define  ngram ngram8;
+#endif
+	TInt err=KErrNone; 
+	while(err==KErrNone)
+		{
+		TRAP(err, number = fileStream.ReadUint8L()); 
+		if(err==KErrNone)
+			{
+			if(aUseNarrowChar)
+				{
+				fileStream.ReadL(ngram8,aN);
+				SetNgram(ngram8, number);
+				}
+			else
+				{
+				fileStream.ReadL(ngram,aN);
+				SetNgram(ngram, number);
+				}
+			}
+		}
+	CleanupStack::PopAndDestroy(2);
+	}
+
+	
+HBufC*  CWordNgrams::WordLC()
+	{
+	HBufC* buffer = HBufC::NewLC(KMaxWordLength);
+	TPtr word = buffer->Des();
+	while(AddLetter(word))
+		{}
+	return buffer;
+	}
+
+
+/** Return false if done*/
+TBool CWordNgrams::AddLetter(TDes& aWord)
+	{
+	if(aWord.Length()==aWord.MaxLength())
+		{
+		return EFalse;
+		}
+	TChar c = NextLetter(aWord);
+	if(c==0)
+		{
+		return EFalse;
+		}
+	aWord.Append(c);
+	return ETrue;
+	}
+
+//
+// CWordDigrams.
+//
+
+
+CWordDigrams::CWordDigrams(TInt64& aRandSeed) : iRandSeed(aRandSeed)
+	{}
+
+
+CWordDigrams* CWordDigrams::NewLC(const TDesC& aFilename, TInt64& aRandSeed)
+	{
+	CWordDigrams* self = new(ELeave) CWordDigrams(aRandSeed);
+	CleanupStack::PushL(self);
+	self->ConstructL(aFilename);
+	return self;
+	}
+
+void CWordDigrams::SetNgram(const TDesC8& aNgram, TUint aNumber)
+	{
+	iDigrams[Index(aNgram[0])][Index(aNgram[1])] = (TUint8) aNumber;
+	}
+
+void CWordDigrams::SetNgram(const TDesC16& /*aNgram*/, TUint /*aNumber*/)
+	{}
+
+void CWordDigrams::ConstructL(const TDesC& aFilename)
+	{
+	CWordNgrams::ConstructL(aFilename);
+	for(TInt i=0;i<KDigramNumberOfChars;i++)
+		{
+		TUint max =0;
+		for(TInt j=0;j<KDigramNumberOfChars;j++)
+			{
+			max += iDigrams[i][j];
+			}
+		iSizes[i] = (TUint16)max;
+		}
+	}
+
+
+
+TChar CWordDigrams::NextLetter(const TDesC& aWord)
+	{
+	TInt len = aWord.Length();
+	TInt index = 0;
+	if(len!=0)
+		{
+		index = Index(aWord[len-1]);
+		}
+
+	if(iSizes[index]==0)
+		{
+		return 0;
+		}
+	TInt x = Math::Rand(iRandSeed) % iSizes[index];
+	for(TInt i=0;i<KDigramNumberOfChars;i++)
+		{
+		if(x<iDigrams[index][i])
+			{
+			return Char(i);
+			}
+		x-=iDigrams[index][i];
+		if(x<=0) 
+			{
+			x=1;
+			}
+		}
+	return 0;
+	}
+
+
+
+TInt CWordDigrams::Index(TChar c)
+	{
+	
+	if(c.IsSpace())
+		return 1;
+	if(c=='-')
+		return 2;
+	if(c.IsUpper())
+		return ((TUint)c)-'A'+KDigramNumberOfNonLetters;
+	if(c.IsLower())
+		return ((TUint) c)-'a'+KDigramNumberOfLetters+KDigramNumberOfNonLetters;
+	return 0;
+	}
+
+
+TChar CWordDigrams::Char(TInt i)
+	{
+	if(i==0)
+		return 0;
+	if(i==1)
+		return ' ';
+	if(i==2)
+		return '-';
+	if(i<KDigramNumberOfNonLetters+KDigramNumberOfLetters)
+		return TChar('A'+i-KDigramNumberOfNonLetters);
+	return TChar('a'+i-KDigramNumberOfNonLetters-KDigramNumberOfLetters);
+	}
+
+
+CWordDigrams::~CWordDigrams()
+	{}