content: package org.apache.lucene.store;
  
  /**
   * 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.
   */
  
  import java.io.*;
  
  import org.apache.lucene.store.DataInput;
  
  /**
   * A {@link DataInput} wrapping a plain {@link InputStream}.
   */
  public class InputStreamDataInput extends DataInput implements Closeable {
    private final InputStream is;
    
    public InputStreamDataInput(InputStream is) {
      this.is = is;
    }
  
    @Override
    public byte readByte() throws IOException {
      int v = is.read();
      if (v == -1) throw new EOFException();
      return (byte) v;
    }
    
    @Override
    public void readBytes(byte[] b, int offset, int len) throws IOException {
      while (len > 0) {
        final int cnt = is.read(b, offset, len);
        if (cnt < 0) {
            // Partially read the input, but no more data available in the stream.
            throw new EOFException();
        }
        len -= cnt;
        offset += cnt;
      }
    }
  
    // @Override -- not until Java 1.6
    public void close() throws IOException {
      is.close();
    }
  }
  