Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2013 bits of proof zrt.
 *
 * 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.
 */

import java.math.BigInteger;

public class Main {
    private static final char[] b58 = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz".toCharArray();

    public static String toBase58(byte[] b) {
        if (b.length == 0) {
            return "";
        }

        int lz = 0;
        while (lz < b.length && b[lz] == 0) {
            ++lz;
        }

        StringBuffer s = new StringBuffer();
        BigInteger n = new BigInteger(1, b);
        while (n.compareTo(BigInteger.ZERO) > 0) {
            BigInteger[] r = n.divideAndRemainder(BigInteger.valueOf(58));
            n = r[0];
            char digit = b58[r[1].intValue()];
            s.append(digit);
        }
        while (lz > 0) {
            --lz;
            s.append("1");
        }
        return s.reverse().toString();
    }

    public static byte[] reverse(byte[] data) {
        for (int i = 0, j = data.length - 1; i < data.length / 2; i++, j--) {
            data[i] ^= data[j];
            data[j] ^= data[i];
            data[i] ^= data[j];
        }
        return data;
    }
}