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The Amazon Web Services SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2010-2014 Amazon.com, Inc. or its affiliates. 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.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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.amazonaws.util;

import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * Simple input stream wrapper utility to count the bytes read from a stream.
 */
public class CountingInputStream extends FilterInputStream {
    private long byteCount = 0;

    public CountingInputStream(InputStream in) {
        super(in);
    }

    /**
     * Returns the number of bytes read from this stream so far.
     *
     * @return the number of bytes read from this stream so far.
     */
    public long getByteCount() {
        return byteCount;
    }

    @Override
    public int read() throws IOException {
        int tmp = super.read();
        byteCount += tmp >= 0 ? 1 : 0;
        return tmp;
    }

    @Override
    public int read(byte[] b, int off, int len) throws IOException {
        int tmp = super.read(b, off, len);
        byteCount += tmp >= 0 ? tmp : 0;
        return tmp;
    }
}