| /* |
| * 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.commons.compress.utils; |
| |
| import java.io.FilterInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * Stream that tracks the number of bytes read. |
| * @since Apache Commons Compress 1.3 |
| * @NotThreadSafe |
| */ |
| public class CountingInputStream extends FilterInputStream { |
| private long bytesRead; |
| |
| public CountingInputStream(final InputStream in) { |
| super(in); |
| } |
| |
| @Override |
| public int read() throws IOException { |
| int r = in.read(); |
| if (r >= 0) { |
| count(1); |
| } |
| return r; |
| } |
| @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 { |
| int r = in.read(b, off, len); |
| if (r >= 0) { |
| count(r); |
| } |
| return r; |
| } |
| /** |
| * Increments the counter of already read bytes. |
| * Doesn't increment if the EOF has been hit (read == -1) |
| * |
| * @param read the number of bytes read |
| */ |
| protected final void count(long read) { |
| if (read != -1) { |
| bytesRead += read; |
| } |
| } |
| |
| /** |
| * Returns the current number of bytes read from this stream. |
| * @return the number of read bytes |
| */ |
| public long getBytesRead() { |
| return bytesRead; |
| } |
| } |