Java BigInteger from Stream readBigInteger(DataInputStream dis)

License

Declaration

public static BigInteger readBigInteger(DataInputStream dis) throws IOException 

Method Source Code

//package com.java2s;
/*/* w  w w  .  jav a  2 s .c o  m*/
 *   This file is part of dhcp4java, a DHCP API for the Java language.
 *   (c) 2006 Stephan Hadinger
 *
 *   This library is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU Lesser General Public
 *   License as published by the Free Software Foundation; either
 *   version 2.1 of the License, or (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *   Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

import java.io.DataInputStream;

import java.io.IOException;
import java.math.BigInteger;

public class Main {
    /**
     * Read a (reasonably short) BigInteger from a DataInputStream
     *  <at> param dis the stream to read from
     *  <at> return a BigInteger
     */
    public static BigInteger readBigInteger(DataInputStream dis) throws IOException {
        short i = dis.readShort();
        if (i < 0) {
            throw new IOException("Invalid BigInteger length: " + i);
        }
        byte[] buf = new byte[i];
        dis.readFully(buf);
        return new BigInteger(1, buf);
    }
}

Related

1. readBigInteger(ByteArrayInputStream bais)
2. readBigInteger(InputStream input)
3. readBigInteger(int n, DataInput dis)
4. readLineAsBigInteger(BufferedReader br)
5. readLuposBigInteger(final int numberOfBits, final InputStream is)