--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/phonebookengines/VirtualPhonebook/inc/TFixedDigitString.h	Tue Feb 02 10:12:17 2010 +0200
@@ -0,0 +1,147 @@
+/*
+* Copyright (c) 2005-2007 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:  Fixed digit string handler class
+*
+*/
+
+
+#ifndef VPBKENGUTILS_TFIXEDDIGITSTRING_H
+#define VPBKENGUTILS_TFIXEDDIGITSTRING_H
+
+// INCLUDES
+#include <e32std.h>
+
+namespace VPbkEngUtils {
+
+// FORWARD DECLARATIONS
+
+
+// CLASS DECLARATIONS
+
+/**
+ * Fixed-length digit string.
+ * Phone number matching helper class: encodes decimal digit characters to BCD 
+ * (Binary Coded Decimal) format for efficient matching.
+ */
+class TFixedDigitString
+    {
+    public:
+        /**
+         * Default constructor. Resets this digit string to empty.
+         */
+        TFixedDigitString();
+
+        /**
+         * Returns the length of this digit string.
+         * @return the number of digits in this digit string,
+         */
+        TInt Length() const;
+
+        /**
+         * Returns true if this digit string is empty.
+         */
+        TBool IsEmpty() const;
+
+        /**
+         * Returns the maximum number of digits this object may contain.
+         */
+        static TInt MaxLength();
+
+        /**
+         * Returns non-modifiable decimal digit at position aIndex.
+         *
+         * @pre  aIndex >= 0 && aIndex < Length()
+         * @post result >= 0 && result <= 9
+         */
+        TInt operator[](TInt aIndex) const;
+
+        /**
+         * Compares the digits in this string to another digit string.
+         *
+         * @param aOther    the other digit string to compare this string with.
+         * @param aNumDigits    the number of digits to compare. Zero means
+         *                      all digits are compared.
+         * @pre Result is undefined if aNumDigits < 0 || aNumDigits > MaxLength().
+         * @return true if aNumDigits digits match
+         */
+        TBool Compare(const TFixedDigitString& aOther, TInt aNumDigits) const;
+
+        /**
+         * Resets this digit string to empty.
+         * @post Length() == 0
+         */
+        void Reset();
+
+        /**
+         * Encodes digit characters from text to this digit string.
+         *
+         * @param aDigitsText   text to encode decimal digit characters from.
+         *                      Nondigit characters are skipped. The encoded 
+         *                      and skipped characters are removed from the 
+         *                      parameter. At maximum MaxLength() digits
+         *                      are encoded.
+         */
+        void EncodeDigits(TPtrC& aDigitsText);
+
+    private:  // Implementation
+        enum 
+            {
+            KBitsPerDigit = 4,
+            KMaxDigits = 8*sizeof(TUint) / KBitsPerDigit,
+            KMaxBits = KMaxDigits * KBitsPerDigit,
+            KNaNBCD = 0xf,
+            KNaN = -1
+            };
+        inline TBool DoCompare(const TFixedDigitString& aOther, TInt aNumDigits) const;
+
+    private:  // Data
+        /// Own. Bcd digits to be compared
+        TUint iBcdDigits;
+    };
+
+
+// INLINE FUNCTIONS
+
+inline TInt TFixedDigitString::MaxLength()
+    {
+    return KMaxDigits;
+    }
+
+/**
+ * Inline implementation of Compare.
+ */
+inline TBool TFixedDigitString::DoCompare
+        (const TFixedDigitString& aOther, TInt aNumDigits) const
+    {
+    const TUint mask = ~TUint(0) >> ((KBitsPerDigit*(KMaxDigits - aNumDigits)) % (KMaxBits));
+    if ((iBcdDigits ^ aOther.iBcdDigits) & mask)
+        return EFalse;
+    else
+        return ETrue;
+    }
+
+#ifdef NDEBUG
+// Inline version of TFixedDigitString::Compare for non-debug builds
+inline TBool TFixedDigitString::Compare
+        (const TFixedDigitString& aOther, TInt aNumDigits) const
+    {
+    return DoCompare(aOther, aNumDigits);
+    }
+#endif
+
+
+} // namespace VPbkEngUtils
+
+#endif  // VPBKENGUTILS_TFIXEDDIGITSTRING_H
+