ByteHelper.java example

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strolch-master
/*
 * Copyright 2013 Robert von Burg <eitch@eitchnet.ch>
 * 
 * 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.
 */
package li.strolch.utils.helper;

/**
 * @author Robert von Burg <eitch@eitchnet.ch>
 */
public class ByteHelper {

	/**
	 * Creates a long of the given byte array. They byte array must be 8 bytes long. The byte at index 0 is the highest
	 * byte
	 * 
	 * @param bytes
	 *            the bytes to convert to a long
	 * 
	 * @return the long created from the bytes
	 */
	public static long toLong(byte[] bytes) {

		if (bytes.length != 8)
			throw new IllegalArgumentException("The input byte array for a long must have 8 values"); //$NON-NLS-1$

		return ((long) (bytes[0] & 0xff) << 56) //
				| ((long) (bytes[1] & 0xff) << 48) //
				| ((long) (bytes[2] & 0xff) << 40) //
				| ((long) (bytes[3] & 0xff) << 32) //
				| ((long) (bytes[4] & 0xff) << 24) //
				| ((long) (bytes[5] & 0xff) << 16) //
				| ((long) (bytes[6] & 0xff) << 8) // 
				| ((bytes[7] & 0xff));
	}

	/**
	 * Creates an integer of the given byte array. They byte array must be 4 bytes long. The byte at index 0 is the
	 * highest byte
	 * 
	 * @param bytes
	 *            the bytes to convert to an integer
	 * 
	 * @return the integer created from the bytes
	 */
	public static int toInt(byte[] bytes) {

		if (bytes.length != 4)
			throw new IllegalArgumentException("The input byte array for a long must have 4 values"); //$NON-NLS-1$

		return ((bytes[0] & 0xff) << 24) //
				| ((bytes[1] & 0xff) << 16) //
				| ((bytes[2] & 0xff) << 8) //
				| ((bytes[3] & 0xff));
	}

	/**
	 * Formats the given byte to a binary string
	 * 
	 * @param b
	 *            the byte to format to a binary string
	 * 
	 * @return the binary string
	 */
	public static String asBinary(byte b) {

		StringBuilder sb = new StringBuilder();

		sb.append(((b >>> 7) & 1));
		sb.append(((b >>> 6) & 1));
		sb.append(((b >>> 5) & 1));
		sb.append(((b >>> 4) & 1));
		sb.append(((b >>> 3) & 1));
		sb.append(((b >>> 2) & 1));
		sb.append(((b >>> 1) & 1));
		sb.append(((b >>> 0) & 1));

		return sb.toString();
	}

	/**
	 * Formats the given byte array to a binary string, separating each byte by a space
	 * 
	 * @param bytes
	 *            the byte to format to a binary string
	 * 
	 * @return the binary string
	 */
	public static String asBinary(byte[] bytes) {
		StringBuilder sb = new StringBuilder();

		for (byte b : bytes) {
			sb.append(asBinary(b));
			sb.append(StringHelper.SPACE);
		}

		return sb.toString();
	}

	/**
	 * Formats the given integer to a binary string, each byte is separated by a space
	 * 
	 * @param i
	 *            the integer to format to a string
	 * 
	 * @return the binary string
	 */
	public static String asBinary(int i) {

		StringBuilder sb = new StringBuilder();

		sb.append(((i >>> 31) & 1));
		sb.append(((i >>> 30) & 1));
		sb.append(((i >>> 29) & 1));
		sb.append(((i >>> 28) & 1));
		sb.append(((i >>> 27) & 1));
		sb.append(((i >>> 26) & 1));
		sb.append(((i >>> 25) & 1));
		sb.append(((i >>> 24) & 1));

		sb.append(StringHelper.SPACE);

		sb.append(((i >>> 23) & 1));
		sb.append(((i >>> 22) & 1));
		sb.append(((i >>> 21) & 1));
		sb.append(((i >>> 20) & 1));
		sb.append(((i >>> 19) & 1));
		sb.append(((i >>> 18) & 1));
		sb.append(((i >>> 17) & 1));
		sb.append(((i >>> 16) & 1));

		sb.append(StringHelper.SPACE);

		sb.append(((i >>> 15) & 1));
		sb.append(((i >>> 14) & 1));
		sb.append(((i >>> 13) & 1));
		sb.append(((i >>> 12) & 1));
		sb.append(((i >>> 11) & 1));
		sb.append(((i >>> 10) & 1));
		sb.append(((i >>> 9) & 1));
		sb.append(((i >>> 8) & 1));

		sb.append(StringHelper.SPACE);

		sb.append(((i >>> 7) & 1));
		sb.append(((i >>> 6) & 1));
		sb.append(((i >>> 5) & 1));
		sb.append(((i >>> 4) & 1));
		sb.append(((i >>> 3) & 1));
		sb.append(((i >>> 2) & 1));
		sb.append(((i >>> 1) & 1));
		sb.append(((i >>> 0) & 1));

		return sb.toString();
	}

	/**
	 * Formats the given long to a binary string, each byte is separated by a space
	 * 
	 * @param i
	 *            the long to format
	 * 
	 * @return the binary string
	 */
	public static String asBinary(long i) {

		StringBuilder sb = new StringBuilder();

		sb.append(((i >>> 63) & 1));
		sb.append(((i >>> 62) & 1));
		sb.append(((i >>> 61) & 1));
		sb.append(((i >>> 60) & 1));
		sb.append(((i >>> 59) & 1));
		sb.append(((i >>> 58) & 1));
		sb.append(((i >>> 57) & 1));
		sb.append(((i >>> 56) & 1));

		sb.append(StringHelper.SPACE);

		sb.append(((i >>> 55) & 1));
		sb.append(((i >>> 54) & 1));
		sb.append(((i >>> 53) & 1));
		sb.append(((i >>> 52) & 1));
		sb.append(((i >>> 51) & 1));
		sb.append(((i >>> 50) & 1));
		sb.append(((i >>> 49) & 1));
		sb.append(((i >>> 48) & 1));

		sb.append(StringHelper.SPACE);

		sb.append(((i >>> 47) & 1));
		sb.append(((i >>> 46) & 1));
		sb.append(((i >>> 45) & 1));
		sb.append(((i >>> 44) & 1));
		sb.append(((i >>> 43) & 1));
		sb.append(((i >>> 42) & 1));
		sb.append(((i >>> 41) & 1));
		sb.append(((i >>> 40) & 1));

		sb.append(StringHelper.SPACE);

		sb.append(((i >>> 39) & 1));
		sb.append(((i >>> 38) & 1));
		sb.append(((i >>> 37) & 1));
		sb.append(((i >>> 36) & 1));
		sb.append(((i >>> 35) & 1));
		sb.append(((i >>> 34) & 1));
		sb.append(((i >>> 33) & 1));
		sb.append(((i >>> 32) & 1));

		sb.append(StringHelper.SPACE);

		sb.append(((i >>> 31) & 1));
		sb.append(((i >>> 30) & 1));
		sb.append(((i >>> 29) & 1));
		sb.append(((i >>> 28) & 1));
		sb.append(((i >>> 27) & 1));
		sb.append(((i >>> 26) & 1));
		sb.append(((i >>> 25) & 1));
		sb.append(((i >>> 24) & 1));

		sb.append(StringHelper.SPACE);

		sb.append(((i >>> 23) & 1));
		sb.append(((i >>> 22) & 1));
		sb.append(((i >>> 21) & 1));
		sb.append(((i >>> 20) & 1));
		sb.append(((i >>> 19) & 1));
		sb.append(((i >>> 18) & 1));
		sb.append(((i >>> 17) & 1));
		sb.append(((i >>> 16) & 1));

		sb.append(StringHelper.SPACE);

		sb.append(((i >>> 15) & 1));
		sb.append(((i >>> 14) & 1));
		sb.append(((i >>> 13) & 1));
		sb.append(((i >>> 12) & 1));
		sb.append(((i >>> 11) & 1));
		sb.append(((i >>> 10) & 1));
		sb.append(((i >>> 9) & 1));
		sb.append(((i >>> 8) & 1));

		sb.append(StringHelper.SPACE);

		sb.append(((i >>> 7) & 1));
		sb.append(((i >>> 6) & 1));
		sb.append(((i >>> 5) & 1));
		sb.append(((i >>> 4) & 1));
		sb.append(((i >>> 3) & 1));
		sb.append(((i >>> 2) & 1));
		sb.append(((i >>> 1) & 1));
		sb.append(((i >>> 0) & 1));

		return sb.toString();
	}
}