    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017
    018package org.apache.commons.compress.compressors.brotli;
    019
    020import java.io.IOException;
    021import java.io.InputStream;
    022
    023import org.apache.commons.compress.compressors.CompressorInputStream;
    024import org.apache.commons.compress.utils.CountingInputStream;
    025import org.apache.commons.compress.utils.IOUtils;
    026import org.apache.commons.compress.utils.InputStreamStatistics;
    027import org.brotli.dec.BrotliInputStream;
    028
    029/**
    030 * {@link CompressorInputStream} implementation to decode Brotli encoded stream.
    031 * Library relies on <a href="https://github.com/google/brotli">Google brotli</a>
    032 *
    033 * @since 1.14
    034 */
    035public class BrotliCompressorInputStream extends CompressorInputStream
    036    implements InputStreamStatistics {
    037
    038    private final CountingInputStream countingStream;
    039    private final BrotliInputStream decIS;
    040
    041    public BrotliCompressorInputStream(final InputStream in) throws IOException {
    042        decIS = new BrotliInputStream(countingStream = new CountingInputStream(in));
    043    }
    044
    045    @Override
    046    public int available() throws IOException {
    047        return decIS.available();
    048    }
    049
    050    @Override
    051    public void close() throws IOException {
    052        decIS.close();
    053    }
    054
    055    @Override
    056    public int read(final byte[] b) throws IOException {
    057        return decIS.read(b);
    058    }
    059
    060    @Override
    061    public long skip(final long n) throws IOException {
    062        return IOUtils.skip(decIS, n);
    063    }
    064
    065    @Override
    066    public synchronized void mark(final int readlimit) {
    067        decIS.mark(readlimit);
    068    }
    069
    070    @Override
    071    public boolean markSupported() {
    072        return decIS.markSupported();
    073    }
    074
    075    @Override
    076    public int read() throws IOException {
    077        final int ret = decIS.read();
    078        count(ret == -1 ? 0 : 1);
    079        return ret;
    080    }
    081
    082    @Override
    083    public int read(final byte[] buf, final int off, final int len) throws IOException {
    084        final int ret = decIS.read(buf, off, len);
    085        count(ret);
    086        return ret;
    087    }
    088
    089    @Override
    090    public String toString() {
    091        return decIS.toString();
    092    }
    093
    094    @Override
    095    public synchronized void reset() throws IOException {
    096        decIS.reset();
    097    }
    098
    099    /**
    100     * @since 1.17
    101     */
    102    @Override
    103    public long getCompressedCount() {
    104        return countingStream.getBytesRead();
    105    }
    106}