Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

import java.util.Random;

public class Main {
    public static byte[][] splitUnicodeMessage(byte[] aMessage, Integer maximumMultipartMessageSegmentSize) {

        final byte UDHIE_HEADER_LENGTH = 0x05;
        final byte UDHIE_IDENTIFIER_SAR = 0x00;
        final byte UDHIE_SAR_LENGTH = 0x03;

        // determine how many messages have to be sent
        int numberOfSegments = aMessage.length / maximumMultipartMessageSegmentSize;
        int messageLength = aMessage.length;
        if (numberOfSegments > 255) {
            numberOfSegments = 255;
            messageLength = numberOfSegments * maximumMultipartMessageSegmentSize;
        }
        if ((messageLength % maximumMultipartMessageSegmentSize) > 0) {
            numberOfSegments++;
        }

        // prepare array for all of the msg segments
        byte[][] segments = new byte[numberOfSegments][];

        int lengthOfData;

        // generate new reference number
        byte[] referenceNumber = new byte[1];
        new Random().nextBytes(referenceNumber);

        // split the message adding required headers
        for (int i = 0; i < numberOfSegments; i++) {
            if (numberOfSegments - i == 1) {
                lengthOfData = messageLength - i * maximumMultipartMessageSegmentSize;
            } else {
                lengthOfData = maximumMultipartMessageSegmentSize;
            }

            // new array to store the header
            segments[i] = new byte[6 + lengthOfData];

            // UDH header
            // doesn't include itself, its header length
            segments[i][0] = UDHIE_HEADER_LENGTH;
            // SAR identifier
            segments[i][1] = UDHIE_IDENTIFIER_SAR;
            // SAR length
            segments[i][2] = UDHIE_SAR_LENGTH;
            // reference number (same for all messages)
            segments[i][3] = referenceNumber[0];
            // total number of segments
            segments[i][4] = (byte) numberOfSegments;
            // segment number
            segments[i][5] = (byte) (i + 1);

            // copy the data into the array
            System.arraycopy(aMessage, (i * maximumMultipartMessageSegmentSize), segments[i], 6, lengthOfData);

        }
        return segments;
    }
}