Here you can find the source of writeInts4(final ByteBuffer bb, final int... values)
public static void writeInts4(final ByteBuffer bb, final int... values) throws IOException
//package com.java2s; /*/*from w w w . j a v a 2s.c om*/ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright (c) 1997-2017 Oracle and/or its affiliates. All rights reserved. * * The contents of this file are subject to the terms of either the GNU * General Public License Version 2 only ("GPL") or the Common Development * and Distribution License("CDDL") (collectively, the "License"). You * may not use this file except in compliance with the License. You can * obtain a copy of the License at * https://oss.oracle.com/licenses/CDDL+GPL-1.1 * or LICENSE.txt. See the License for the specific * language governing permissions and limitations under the License. * * When distributing the software, include this License Header Notice in each * file and include the License file at LICENSE.txt. * * GPL Classpath Exception: * Oracle designates this particular file as subject to the "Classpath" * exception as provided by Oracle in the GPL Version 2 section of the License * file that accompanied this code. * * Modifications: * If applicable, add the following below the License Header, with the fields * enclosed by brackets [] replaced by your own identifying information: * "Portions Copyright [year] [name of copyright owner]" * * Contributor(s): * If you wish your version of this file to be governed by only the CDDL or * only the GPL Version 2, indicate your decision by adding "[Contributor] * elects to include this software in this distribution under the [CDDL or GPL * Version 2] license." If you don't indicate a single choice of license, a * recipient has the option to distribute your version of this file under * either the CDDL, the GPL Version 2 or to extend the choice of license to * its licensees as provided above. However, if you add GPL Version 2 code * and therefore, elected the GPL Version 2 license, then the option applies * only if the new code is made subject to such option by the copyright * holder. */ import java.io.IOException; import java.io.OutputStream; import java.nio.ByteBuffer; public class Main { public static void writeInts4(final ByteBuffer bb, final int... values) throws IOException { writeInts4(bb, values, 0, values.length); } public static void writeInts4(final ByteBuffer bb, final int[] array, final int offset, final int count) throws IOException { int shiftValue = 0; for (int i = 0; i < count - 1; i++) { final int value = array[offset + i]; shiftValue = writeInt4(bb, value, shiftValue, false); } if (count > 0) { writeInt4(bb, array[offset + count - 1], shiftValue, true); } } public static void writeInts4(final OutputStream out, final int... values) throws IOException { writeInts4(out, values, 0, values.length); } public static void writeInts4(final OutputStream out, final int[] array, final int offset, final int count) throws IOException { int shiftValue = 0; for (int i = 0; i < count - 1; i++) { final int value = array[offset + i]; shiftValue = writeInt4(out, value, shiftValue, false); } if (count > 0) { writeInt4(out, array[offset + count - 1], shiftValue, true); } } public static void writeInt4(final OutputStream os, int value) throws IOException { int nibbleL; int nibbleH; do { nibbleH = value & 7; value >>>= 3; if (value != 0) { nibbleH |= 8; nibbleL = value & 7; value >>>= 3; if (value != 0) { nibbleL |= 8; } } else { nibbleL = 0; } os.write(nibbleL | (nibbleH << 4)); } while (value != 0); } public static int writeInt4(final OutputStream out, int value, int highValue, final boolean flush) throws IOException { int nibbleL; int nibbleH; if (highValue > 0) { highValue &= 0x70; // clear highest bit nibbleL = value & 7; value >>>= 3; if (value != 0) { nibbleL |= 8; } out.write(highValue | nibbleL); if (value == 0) { return 0; } } do { // shift nibbleH to high byte's bits nibbleH = (value & 7) << 4; value >>>= 3; if (value != 0) { nibbleH |= 0x80; nibbleL = value & 7; value >>>= 3; if (value != 0) { nibbleL |= 8; } } else { if (!flush) { return nibbleH | 0x80; } nibbleL = 0; } out.write(nibbleH | nibbleL); } while (value != 0); return 0; } public static int writeInt4(final ByteBuffer bb, int value, int highValue, final boolean flush) throws IOException { int nibbleL; int nibbleH; if (highValue > 0) { highValue &= 0x70; // clear highest bit nibbleL = value & 7; value >>>= 3; if (value != 0) { nibbleL |= 8; } bb.put((byte) (highValue | nibbleL)); if (value == 0) { return 0; } } do { // shift nibbleH to high byte's bits nibbleH = (value & 7) << 4; value >>>= 3; if (value != 0) { nibbleH |= 0x80; nibbleL = value & 7; value >>>= 3; if (value != 0) { nibbleL |= 8; } } else { if (!flush) { return nibbleH | 0x80; } nibbleL = 0; } bb.put((byte) (nibbleH | nibbleL)); } while (value != 0); return 0; } }