| /** |
| * 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.statelib.impl; |
| |
| import com.google.protobuf.ByteString; |
| |
| /** |
| * Bytes related utils. |
| */ |
| public class Bytes { |
| |
| /** |
| * Get a long number from a bytes array starting from the provided {@code index}. |
| * |
| * @param memory the bytes array |
| * @param index the starting index |
| * @return the long number. |
| */ |
| public static long toLong(byte[] memory, int index) { |
| return ((long) memory[index] & 0xff) << 56 |
| | ((long) memory[index + 1] & 0xff) << 48 |
| | ((long) memory[index + 2] & 0xff) << 40 |
| | ((long) memory[index + 3] & 0xff) << 32 |
| | ((long) memory[index + 4] & 0xff) << 24 |
| | ((long) memory[index + 5] & 0xff) << 16 |
| | ((long) memory[index + 6] & 0xff) << 8 |
| | (long) memory[index + 7] & 0xff; |
| } |
| |
| /** |
| * Get a long number from a {@link ByteString}. |
| * |
| * @param bs byte string |
| * @return the long number. |
| */ |
| public static long toLong(ByteString bs) { |
| return ((long) bs.byteAt(0) & 0xff) << 56 |
| | ((long) bs.byteAt(1) & 0xff) << 48 |
| | ((long) bs.byteAt(2) & 0xff) << 40 |
| | ((long) bs.byteAt(3) & 0xff) << 32 |
| | ((long) bs.byteAt(4) & 0xff) << 24 |
| | ((long) bs.byteAt(5) & 0xff) << 16 |
| | ((long) bs.byteAt(6) & 0xff) << 8 |
| | (long) bs.byteAt(7) & 0xff; |
| } |
| |
| /** |
| * Convert a long number to a bytes array. |
| * |
| * @param value the long number |
| * @return the bytes array |
| */ |
| public static byte[] toBytes(long value) { |
| byte[] memory = new byte[8]; |
| toBytes(value, memory, 0); |
| return memory; |
| } |
| |
| public static void toBytes(long value, byte[] memory, int index) { |
| memory[index] = (byte) (value >>> 56); |
| memory[index + 1] = (byte) (value >>> 48); |
| memory[index + 2] = (byte) (value >>> 40); |
| memory[index + 3] = (byte) (value >>> 32); |
| memory[index + 4] = (byte) (value >>> 24); |
| memory[index + 5] = (byte) (value >>> 16); |
| memory[index + 6] = (byte) (value >>> 8); |
| memory[index + 7] = (byte) value; |
| } |
| |
| } |