/* ==================================================================== Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for Additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. ==================================================================== */ using System; namespace HH.WMS.Utils.NPOI.SS.Util { using HH.WMS.Utils.NPOI.Util; /* * Represents a 64 bit IEEE double quantity expressed with both decimal and binary exponents * Does not handle negative numbers or zero *

* The value of a {@link ExpandedDouble} is given by
* a × 2b *
* where:
* * a = significand
* b = binaryExponent - bitLength(significand) + 1
* * @author Josh Micich */ public class ExpandedDouble { private static BigInteger BI_FRAC_MASK = new BigInteger(IEEEDouble.FRAC_MASK); private static BigInteger BI_IMPLIED_FRAC_MSB = new BigInteger(IEEEDouble.FRAC_ASSUMED_HIGH_BIT); private static BigInteger GetFrac(long rawBits) { return (new BigInteger(rawBits)&BI_FRAC_MASK|BI_IMPLIED_FRAC_MSB)<<11; } public static ExpandedDouble FromRawBitsAndExponent(long rawBits, int exp) { return new ExpandedDouble(GetFrac(rawBits), exp); } /** * Always 64 bits long (MSB, bit-63 is '1') */ private BigInteger _significand; private int _binaryExponent; public ExpandedDouble(long rawBits) { int biasedExp = (int)(rawBits >> 52); if (biasedExp == 0) { // sub-normal numbers BigInteger frac = new BigInteger(rawBits)&BI_FRAC_MASK; int expAdj = 64 - frac.BitLength(); _significand = frac<