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17af35f713
git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@798771 13f79535-47bb-0310-9956-ffa450edef68
45 lines
1.8 KiB
Java
45 lines
1.8 KiB
Java
/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.ss.util;
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/**
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* For working with the internals of IEEE 754-2008 'binary64' (double precision) floating point numbers
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*
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* @author Josh Micich
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*/
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final class IEEEDouble {
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private static final long EXPONENT_MASK = 0x7FF0000000000000L;
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private static final int EXPONENT_SHIFT = 52;
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public static final long FRAC_MASK = 0x000FFFFFFFFFFFFFL;
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public static final int EXPONENT_BIAS = 1023;
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public static final long FRAC_ASSUMED_HIGH_BIT = ( 1L<<EXPONENT_SHIFT );
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/**
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* The value the exponent field gets for all <i>NaN</i> and <i>Infinity</i> values
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*/
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public static final int BIASED_EXPONENT_SPECIAL_VALUE = 0x07FF;
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/**
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* @param rawBits the 64 bit binary representation of the double value
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* @return the top 12 bits (sign and biased exponent value)
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*/
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public static int getBiasedExponent(long rawBits) {
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return (int) ((rawBits & EXPONENT_MASK) >> EXPONENT_SHIFT);
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}
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}
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