Java Byte Array to Float byteArrayToFloat(byte[] bytes, int size, int fpBits)

Description

Convert a byte array to its floating point representation.

License

Open Source License

Parameter

Parameter	Description
bytes	An array of bytes no smaller than the size to be converted
size	Number of bytes to convert to the float. May not exceed 8.
fpBits	Number of bits representing the decimal

Return

A float; the integer portion representing the byte array as an integer shifted by the bits specified in fpBits; with the remaining bits used as a decimal

Declaration

public static float byteArrayToFloat(byte[] bytes, int size, int fpBits)

Method Source Code

//package com.java2s;
/**//from  w w w.j av  a2  s.c  o m
 * Oshi (https://github.com/dblock/oshi)
 *
 * Copyright (c) 2010 - 2016 The Oshi Project Team
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Maintainers:
 * dblock[at]dblock[dot]org
 * widdis[at]gmail[dot]com
 * enrico.bianchi[at]gmail[dot]com
 *
 * Contributors:
 * https://github.com/dblock/oshi/graphs/contributors
 */

public class Main {
    /**
     * Convert a byte array to its floating point representation.
     *
     * @param bytes
     *            An array of bytes no smaller than the size to be converted
     * @param size
     *            Number of bytes to convert to the float. May not exceed 8.
     * @param fpBits
     *            Number of bits representing the decimal
     * @return A float; the integer portion representing the byte array as an
     *         integer shifted by the bits specified in fpBits; with the
     *         remaining bits used as a decimal
     */
    public static float byteArrayToFloat(byte[] bytes, int size, int fpBits) {
        return byteArrayToLong(bytes, size) / (float) (1 << fpBits);
    }

    /**
     * Convert a byte array to its integer representation.
     *
     * @param bytes
     *            An array of bytes no smaller than the size to be converted
     * @param size
     *            Number of bytes to convert to the long. May not exceed 8.
     * @return An integer representing the byte array as a 64-bit number
     */
    public static long byteArrayToLong(byte[] bytes, int size) {
        if (size > 8) {
            throw new IllegalArgumentException("Can't convert more than 8 bytes.");
        }
        if (size > bytes.length) {
            throw new IllegalArgumentException("Size can't be larger than array length.");
        }
        long total = 0L;
        for (int i = 0; i < size; i++) {
            total = total << 8 | bytes[i] & 0xff;
        }
        return total;
    }
}