Java BigInteger from Stream readBigInteger(int n, DataInput dis)

Description

read Big Integer

License

Open Source License

Declaration

public static BigInteger readBigInteger(int n, DataInput dis) throws IOException 

Method Source Code

//package com.java2s;
import java.io.DataInput;

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

public class Main {
    public static BigInteger readBigInteger(int n, DataInput dis) throws IOException {
        BigInteger ret = BigInteger.ZERO;

        byte[] temp = new byte[n];
        dis.readFully(temp, 0, n);/*www  .  jav  a2 s. c  o  m*/

        for (int j = n - 1; j >= 0; j--) {
            ret = ret.or(BigInteger.valueOf(0xFF & temp[j]));
            ret = ret.shiftLeft(8);
        }
        ret = ret.shiftRight(8);

        return ret;
    }

    public static BigInteger readBigInteger(DataInput ois) throws IOException {
        int length = ois.readInt();
        byte[] bytes = new byte[length];
        ois.readFully(bytes, 0, length);

        return new BigInteger(bytes);
    }
}

Related

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