    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. Library relies on <a href="https://github.com/google/brotli">Google brotli</a>
    031 *
    032 * @since 1.14
    033 */
    034public class BrotliCompressorInputStream extends CompressorInputStream implements InputStreamStatistics {
    035
    036    private final CountingInputStream countingInputStream;
    037    private final BrotliInputStream brotliInputStream;
    038
    039    public BrotliCompressorInputStream(final InputStream inputStream) throws IOException {
    040        brotliInputStream = new BrotliInputStream(countingInputStream = new CountingInputStream(inputStream));
    041    }
    042
    043    @Override
    044    public int available() throws IOException {
    045        return brotliInputStream.available();
    046    }
    047
    048    @Override
    049    public void close() throws IOException {
    050        brotliInputStream.close();
    051    }
    052
    053    /**
    054     * @since 1.17
    055     */
    056    @Override
    057    public long getCompressedCount() {
    058        return countingInputStream.getBytesRead();
    059    }
    060
    061    @Override
    062    public synchronized void mark(final int readLimit) {
    063        brotliInputStream.mark(readLimit);
    064    }
    065
    066    @Override
    067    public boolean markSupported() {
    068        return brotliInputStream.markSupported();
    069    }
    070
    071    @Override
    072    public int read() throws IOException {
    073        final int ret = brotliInputStream.read();
    074        count(ret == -1 ? 0 : 1);
    075        return ret;
    076    }
    077
    078    @Override
    079    public int read(final byte[] b) throws IOException {
    080        return brotliInputStream.read(b);
    081    }
    082
    083    @Override
    084    public int read(final byte[] buf, final int off, final int len) throws IOException {
    085        final int ret = brotliInputStream.read(buf, off, len);
    086        count(ret);
    087        return ret;
    088    }
    089
    090    @Override
    091    public synchronized void reset() throws IOException {
    092        brotliInputStream.reset();
    093    }
    094
    095    @Override
    096    public long skip(final long n) throws IOException {
    097        return IOUtils.skip(brotliInputStream, n);
    098    }
    099
    100    @Override
    101    public String toString() {
    102        return brotliInputStream.toString();
    103    }
    104}