Andrej Cimperšek - diploma

package org.lidar;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

/**

 * Util

 * @author Andrej Cimpersek

 */

public class Util {

    public static byte CalcXOR(byte[] data, int offset, int count)

    {

        byte x = data[offset];

        for (int i = 1; i < count; i++) x ^= data[offset + i];

        return x;

    }

    private static byte CalcXOR(String data)

    {

        byte x = (byte)(data.charAt(0));

        for (int i = 1; i < data.length(); i++) x ^= (byte)(data.charAt(i));

        return x;

    }

    public static byte[] GetBytesFromFile(File file) throws IOException {

        InputStream is = new FileInputStream(file);

        // Get the size of the file

        long length = file.length();

        if (length > Integer.MAX_VALUE) {

            throw new IOException("File is too large!");

        }

        // Create the byte array to hold the data

        byte[] bytes = new byte[(int)length];

        // Read in the bytes

        int offset = 0;

        int numRead = 0;

        while (offset < bytes.length

               && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {

            offset += numRead;

        }

        // Ensure all the bytes have been read in

        if (offset < bytes.length) {

            throw new IOException("Could not completely read file "+file.getName());

        }

        // Close the input stream and return bytes

        is.close();

        return bytes;

    }

}