Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

public class Main {
    public static String[] toStringA(byte[] data) {
        // Advanced Technique: Extract the String array's length
        // from the first four bytes in the char array, and then
        // read the int array denoting the String lengths, and
        // then read the Strings.
        // ----------
        if (data == null || data.length < 4)
            return null;
        // ----------
        byte[] bBuff = new byte[4]; // Buffer
        // -----
        System.arraycopy(data, 0, bBuff, 0, 4);
        int saLen = toInt(bBuff);
        if (data.length < (4 + (saLen * 4)))
            return null;
        // -----
        bBuff = new byte[saLen * 4];
        System.arraycopy(data, 4, bBuff, 0, bBuff.length);
        int[] sLens = toIntA(bBuff);
        if (sLens == null)
            return null;
        // ----------
        String[] strs = new String[saLen];
        for (int i = 0, dataPos = 4 + (saLen * 4); i < saLen; i++) {
            if (sLens[i] > 0) {
                if (data.length >= (dataPos + sLens[i])) {
                    bBuff = new byte[sLens[i]];
                    System.arraycopy(data, dataPos, bBuff, 0, sLens[i]);
                    dataPos += sLens[i];
                    strs[i] = toString(bBuff);
                } else
                    return null;
            }
        }
        // ----------
        return strs;
    }

    public static int toInt(byte[] data) {
        if (data == null || data.length != 4)
            return 0x0;
        // ----------
        return (int) ( // NOTE: type cast not necessary for int
        (0xff & data[0]) << 24 | (0xff & data[1]) << 16 | (0xff & data[2]) << 8 | (0xff & data[3]) << 0);
    }

    public static int[] toIntA(byte[] data) {
        if (data == null || data.length % 4 != 0)
            return null;
        // ----------
        int[] ints = new int[data.length / 4];
        for (int i = 0; i < ints.length; i++)
            ints[i] = toInt(new byte[] { data[(i * 4)], data[(i * 4) + 1], data[(i * 4) + 2], data[(i * 4) + 3], });
        return ints;
    }

    public static String toString(byte[] data) {
        return (data == null) ? null : new String(data).trim();
    }
}