| /* |
| * 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.jackrabbit.oak.plugins.document; |
| |
| import java.io.InputStream; |
| import java.util.Random; |
| |
| /** |
| * A pseudo-random stream. |
| */ |
| public class RandomStream extends InputStream { |
| |
| private long pos, size; |
| private Random random; |
| |
| public RandomStream(long size, int seed) { |
| this.size = size; |
| this.random = new Random(seed); |
| } |
| |
| @Override |
| public int read() { |
| byte[] data = new byte[1]; |
| int len = read(data, 0, 1); |
| return len <= 0 ? len : data[0] & 255; |
| } |
| |
| @Override |
| public int read(byte[] b, int off, int len) { |
| if (pos >= size) { |
| return -1; |
| } |
| len = (int) Math.min(size - pos, len); |
| long end = off + len; |
| while (off < end) { |
| int r = random.nextInt(); |
| b[off++] = (byte) (r ^ (r >>> 16)); |
| } |
| pos += len; |
| return len; |
| } |
| |
| } |