Util.java

/*
 * Copyright (c) 2004-2011 Marco Maccaferri and others.
 * 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
 *
 * Contributors:
 *     Marco Maccaferri - initial API and implementation
 */

package org.eclipsetrader.directa.internal.core.messages;

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

public class Util {

    public Util() {
    }

    public static float getFloat(byte[] arr, int i) {
        if (arr.length < i + 4) {
            return 0.0F;
        }
        int j = 0;
        int k = 0;
        for (int l = 0; l < 4; l++) {
            k += byteToInt(arr[i + l]) << j;
            j += 8;
        }

        float f = Float.intBitsToFloat(k);
        return f;
    }

    public static int getUInt(byte[] arr, int i) {
        return (int) unpackLong(arr, i, 2);
    }

    public static int getMessageLength(byte[] arr, int i) {
        if (arr.length < i + 2) {
            return 0;
        }
        int j = 0;
        int k = 0;
        for (int l = 0; l < 2; l++) {
            j += byteToInt(arr[i + l]) << k;
            k += 8;
        }

        return j;
    }

    public static short getByte(byte b) {
        return (short) byteToInt(b);
    }

    public static long getUlong(byte[] arr, int i) {
        return unpackLong(arr, i, 4);
    }

    public static long getDataOra(byte[] arr, int i, int j) {
        long k = 0;
        int l = 0;
        for (int i1 = 0; i1 < 4; i1++) {
            k += (long) byteToInt(arr[i1 + i]) << l;
            l += 8;
        }

        long j1 = k >> 20;
        long k1 = k - (j1 << 20);
        k1 /= 12;
        long l1 = k1 / 3600;
        GregorianCalendar gregoriancalendar = new GregorianCalendar(2000 + j * 10, 0, 1, 0, 0, 0);
        long l2 = ((Calendar) gregoriancalendar).getTime().getTime();
        long l3 = j1 * 3600 * 24 * 1000 + k1 * 1000;
        long l4 = l2 + l3;
        ((Calendar) gregoriancalendar).setTime(new Date(l4));
        ((Calendar) gregoriancalendar).set(11, (int) l1);
        return ((Calendar) gregoriancalendar).getTime().getTime();
    }

    public static int byteToInt(byte b) {
        int i = b;
        if (b < 0) {
            i = 256 + b;
        }
        return i;
    }

    private static long unpackLong(byte[] arr, int i, int j) {
        if (arr.length < i + j) {
            return 0L;
        }
        long l = 0L;
        int k = (j - 1) * 8;
        for (int i1 = 0; i1 < j; i1++) {
            l += byteToInt(arr[i + i1]) << k;
            k -= 8;
        }
        return l;
    }
}