| /** |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.bookkeeper.bookie.storage.ldb; |
| |
| // CHECKSTYLE.OFF: IllegalImport |
| import io.netty.util.internal.PlatformDependent; |
| // CHECKSTYLE.ON: IllegalImport |
| |
| import java.nio.ByteOrder; |
| |
| /** |
| * Utility to serialize/deserialize longs into byte arrays. |
| */ |
| class ArrayUtil { |
| |
| private static final boolean UNALIGNED = PlatformDependent.isUnaligned(); |
| private static final boolean HAS_UNSAFE = PlatformDependent.hasUnsafe(); |
| private static final boolean BIG_ENDIAN_NATIVE_ORDER = ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN; |
| |
| public static long getLong(byte[] array, int index) { |
| if (HAS_UNSAFE && UNALIGNED) { |
| long v = PlatformDependent.getLong(array, index); |
| return BIG_ENDIAN_NATIVE_ORDER ? v : Long.reverseBytes(v); |
| } |
| |
| return ((long) array[index] & 0xff) << 56 | // |
| ((long) array[index + 1] & 0xff) << 48 | // |
| ((long) array[index + 2] & 0xff) << 40 | // |
| ((long) array[index + 3] & 0xff) << 32 | // |
| ((long) array[index + 4] & 0xff) << 24 | // |
| ((long) array[index + 5] & 0xff) << 16 | // |
| ((long) array[index + 6] & 0xff) << 8 | // |
| (long) array[index + 7] & 0xff; |
| } |
| |
| public static void setLong(byte[] array, int index, long value) { |
| if (HAS_UNSAFE && UNALIGNED) { |
| PlatformDependent.putLong(array, index, BIG_ENDIAN_NATIVE_ORDER ? value : Long.reverseBytes(value)); |
| } else { |
| array[index] = (byte) (value >>> 56); |
| array[index + 1] = (byte) (value >>> 48); |
| array[index + 2] = (byte) (value >>> 40); |
| array[index + 3] = (byte) (value >>> 32); |
| array[index + 4] = (byte) (value >>> 24); |
| array[index + 5] = (byte) (value >>> 16); |
| array[index + 6] = (byte) (value >>> 8); |
| array[index + 7] = (byte) value; |
| } |
| } |
| |
| public static final boolean isArrayAllZeros(final byte[] array) { |
| return PlatformDependent.isZero(array, 0, array.length); |
| } |
| } |