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/*
* Copyright (c) 2003, Henri Yandell
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the
* following conditions are met:
*
* + Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* + Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* + Neither the name of Genjava-Core nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package com.generationjava.lang;
import java.math.BigInteger;
// NOTE: A BigInteger runs counter-intuitive possible. For an integer made
// of the bits: 11010101 the first two bits are '01' and not 11.
// That is, the indexing starts from the right and goes left.
public class BigIntegerUtils {
public static float extractFloat(BigInteger bi, int start, int end, int decimal) {
int intpart = extractInt(bi, start+decimal, end);
int decpart = extractInt(bi, start, start+decimal);
float decf = decpart;
while(decf >= 1.0) {
decf = decf / 10;
}
float ret = intpart + decf;
return ret;
}
public static int extractInt(BigInteger bi, int start, int end) {
bi = bi.shiftRight(start);
int foo = (int)Math.pow(2, end - start) - 1;
BigInteger mask = BigInteger.valueOf(foo);
bi = bi.and(mask);
return bi.intValue();
}
public static boolean extractBoolean(BigInteger bi, int index) {
return bi.testBit(index);
}
}
