Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

public class Main {
    private final static String encode(byte[] d) {
        if (d == null)
            return null;

        byte data[] = new byte[d.length + 2];
        System.arraycopy(d, 0, data, 0, d.length);
        byte dest[] = new byte[(data.length / 3) * 4];

        // 3-byte to 4-byte conversion
        for (int sidx = 0, didx = 0; sidx < d.length; sidx += 3, didx += 4) {
            dest[didx] = (byte) ((data[sidx] >>> 2) & 077);
            dest[didx + 1] = (byte) ((data[sidx + 1] >>> 4) & 017 | (data[sidx] << 4) & 077);
            dest[didx + 2] = (byte) ((data[sidx + 2] >>> 6) & 003 | (data[sidx + 1] << 2) & 077);
            dest[didx + 3] = (byte) (data[sidx + 2] & 077);
        }

        // 0-63 to ascii printable conversion
        for (int idx = 0; idx < dest.length; idx++) {
            if (dest[idx] < 26)
                dest[idx] = (byte) (dest[idx] + 'A');
            else if (dest[idx] < 52)
                dest[idx] = (byte) (dest[idx] + 'a' - 26);
            else if (dest[idx] < 62)
                dest[idx] = (byte) (dest[idx] + '0' - 52);
            else if (dest[idx] < 63)
                dest[idx] = (byte) '+';
            else
                dest[idx] = (byte) '/';
        }

        // add padding
        for (int idx = dest.length - 1; idx > (d.length * 4) / 3; idx--) {
            dest[idx] = (byte) '=';
        }
        return new String(dest);
    }
}