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Apache Commons Compress software defines an API for working with compression and archive formats. These include: bzip2, gzip, pack200, lzma, xz, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4, Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.

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/*
 * 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.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * Stream that tracks the number of bytes read.
 * @since 1.3
 * @NotThreadSafe
 */
public class CountingOutputStream extends FilterOutputStream {
    private long bytesWritten = 0;

    public CountingOutputStream(final OutputStream out) {
        super(out);
    }

    @Override
    public void write(int b) throws IOException {
        out.write(b);
        count(1);
    }
    @Override
    public void write(byte[] b) throws IOException {
        write(b, 0, b.length);
    }
    @Override
    public void write(byte[] b, int off, int len) throws IOException {
        out.write(b, off, len);
        count(len);
    }

    /**
     * Increments the counter of already written bytes.
     * Doesn't increment if the EOF has been hit (written == -1)
     * 
     * @param written the number of bytes written
     */
    protected void count(long written) {
        if (written != -1) {
            bytesWritten += written;
        }
    }

    /**
     * Returns the current number of bytes written to this stream.
     * @return the number of written bytes
     */
    public long getBytesWritten() {
        return bytesWritten;
    }
}