content: /*
   * 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.chemistry.opencmis.workbench;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Random;
  
  public class RandomInputStream extends InputStream {
  
      private final Random random;
      private final long length;
      private long pos;
  
      public RandomInputStream(long length) {
          this(length, System.currentTimeMillis());
      }
  
      public RandomInputStream(long length, long seed) {
          random = new Random(seed);
          this.length = length;
          pos = 0;
      }
  
      @Override
      public int available() throws IOException {
          return (int) Math.min(Integer.MAX_VALUE, length - pos);
      }
  
      @Override
      public long skip(long n) throws IOException {
          if (n <= 0) {
              return 0;
          }
  
          for (long l = 0; l < n; l++) {
              if (read() == -1) {
                  return l;
              }
          }
  
          return n;
      }
  
      @Override
      public int read() throws IOException {
          if (pos == length) {
              return -1;
          }
  
          pos++;
  
          return random.nextInt(256);
      }
  
      @Override
      public int read(byte[] b) throws IOException {
          return read(b, 0, b.length);
      }
  
      @Override
      public int read(byte[] b, int off, int len) throws IOException {
          if (b == null) {
              throw new NullPointerException();
          } else if ((off < 0) || (len < 0) || (len > b.length - off)) {
              throw new IndexOutOfBoundsException();
          }
  
          for (int i = 0; i < len; i++) {
              int r = read();
              if (r == -1) {
                  return i == 0 ? -1 : i;
              }
              b[off + i] = (byte) r;
          }
  
          return len;
      }
  }