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+// ==========================================================
+// Helper class for rational numbers
+//
+// Design and implementation by
+// - Hervé Drolon <drolon@infonie.fr>
+//
+// This file is part of FreeImage 3
+//
+// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
+// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
+// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
+// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
+// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
+// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
+// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
+// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
+// THIS DISCLAIMER.
+//
+// Use at your own risk!
+// ==========================================================
+
+#ifndef FIRATIONAL_H
+#define FIRATIONAL_H
+
+/**
+Helper class to deal with rational numbers. 
+NB: LONG data type is assumed to be a signed 32-bit number. 
+*/
+class FIRational {
+private:
+	/// numerator
+	LONG _numerator;
+	/// denominator
+	LONG _denominator;
+
+public:
+	/// Default constructor
+	FIRational();
+
+	/// Constructor with longs
+	FIRational(LONG n, LONG d = 1);
+
+	/// Constructor with FITAG
+	FIRational(const FITAG *tag);
+
+	/// Constructor with a float
+	FIRational(float value);
+
+	/// Copy constructor
+	FIRational (const FIRational& r);
+
+	/// Destructor
+	~FIRational();
+
+	/// Assignement operator
+	FIRational& operator=(FIRational& r);
+
+	/// Get the numerator
+	LONG getNumerator();
+
+	/// Get the denominator
+	LONG getDenominator();
+
+	/// Converts rational value by truncating towards zero
+	LONG truncate() {
+		// Return truncated rational
+		return _denominator ? (LONG) (_numerator / _denominator) : 0;
+	}
+
+	/**@name Implicit conversions */
+	//@{	
+	short shortValue() {
+		return (short)truncate();
+	}
+	int intValue() {
+		return (int)truncate();
+	}
+	LONG longValue() {
+		return (LONG)truncate();
+	}
+	float floatValue() {
+		return _denominator ? ((float)_numerator)/((float)_denominator) : 0;
+	}
+	double doubleValue() {
+		return _denominator ? ((double)_numerator)/((double)_denominator) : 0;
+	}
+	//@}
+
+	/// Checks if this rational number is an integer, either positive or negative
+	BOOL isInteger();
+
+	/// Convert as "numerator/denominator"
+	std::string toString();
+
+private:
+	/// Initialize and normalize a rational number
+	void initialize(LONG n, LONG d);
+
+	/// Calculate GCD
+	LONG gcd(LONG a, LONG b);
+	
+	/// Normalize numerator / denominator 
+	void normalize();
+
+};
+
+#endif // FIRATIONAL_H
+