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// Copyright 2015 The Bazel Authors. All rights reserved.
//
// Licensed 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 com.google.devtools.build.zip;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* An {@link InputStream} that counts the number of bytes read.
*/
public final class CountingInputStream extends FilterInputStream {
private static <T> T checkNotNull(T reference) {
if (reference == null) {
throw new NullPointerException();
}
return reference;
}
private long count;
private long mark = -1;
/**
* Wraps another input stream, counting the number of bytes read.
*
* @param in the input stream to be wrapped
*/
public CountingInputStream(InputStream in) {
super(checkNotNull(in));
}
/** Returns the number of bytes read. */
public long getCount() {
return count;
}
@Override public int read() throws IOException {
int result = in.read();
count += result == -1 ? 0 : 1;
return result;
}
@Override public int read(byte[] b, int off, int len) throws IOException {
int result = in.read(b, off, len);
count += result == -1 ? 0 : result;
return result;
}
@Override public long skip(long n) throws IOException {
long result = in.skip(n);
count += result;
return result;
}
@Override public synchronized void mark(int readlimit) {
in.mark(readlimit);
mark = count;
// it's okay to mark even if mark isn't supported, as reset won't work
}
@Override public synchronized void reset() throws IOException {
if (!in.markSupported()) {
throw new IOException("Mark not supported");
}
if (mark == -1) {
throw new IOException("Mark not set");
}
in.reset();
count = mark;
}
}
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