Java BigInteger Calculate encodeBigInt(OutputStream out, BigInteger x)

Description

encode Big Int

License

Apache License

Declaration

public static void encodeBigInt(OutputStream out, BigInteger x) throws IOException 

Method Source Code

//package com.java2s;
/*//from www.  j av  a 2 s  . c om
 *  Copyright 2009 sirot.
 * 
 *  Licensed 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.
 *  under the License.
 */

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import java.io.OutputStream;
import java.math.BigInteger;

public class Main {
    public static void encodeBigInt(OutputStream out, BigInteger x) throws IOException {
        byte[] value = x.toByteArray();
        encodeInt(out, value.length);
        out.write(value);
    }

    public static byte[] encodeBigInt(BigInteger x) {
        try {
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            encodeBigInt(out, x);
            return out.toByteArray();
        } catch (IOException ioe) {
            /* Does not happen */
            throw new Error(ioe);
        }
    }

    public static byte[] encodeInt(long value) {
        byte[] tmp = new byte[4];
        tmp[0] = (byte) ((value >>> 24) & 0xff);
        tmp[1] = (byte) ((value >>> 16) & 0xff);
        tmp[2] = (byte) ((value >>> 8) & 0xff);
        tmp[3] = (byte) (value & 0xff);
        return tmp;
    }

    public static void encodeInt(OutputStream out, long value) throws IOException {
        byte[] tmp = new byte[4];
        tmp[0] = (byte) ((value >>> 24) & 0xff);
        tmp[1] = (byte) ((value >>> 16) & 0xff);
        tmp[2] = (byte) ((value >>> 8) & 0xff);
        tmp[3] = (byte) (value & 0xff);
        out.write(tmp);
    }
}

Related

1. dumpDataPathId(BigInteger datapathId)
2. dumpNumber(PrintStream out, String s, BigInteger bi)
3. emit(BigInteger integer)
4. encode(BigInteger number, String alphabets)
5. encode_long(BigInteger big)
6. encodeBigIntNoTypeCode(BigInteger value)
7. encodeCompactBits(BigInteger value)
8. encodeFloat(BigInteger j, int e)
9. encodeInteger(BigInteger i, OutputStream os)