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.zstandard;
019
020
021import java.io.IOException;
022import java.io.InputStream;
023
024import com.github.luben.zstd.ZstdInputStream;
025import org.apache.commons.compress.compressors.CompressorInputStream;
026
027/**
028 * {@link CompressorInputStream} implementation to decode Zstandard encoded stream.
029 * Library relies on <a href="https://github.com/luben/zstd-jni/">Zstandard JNI</a>
030 *
031 * @since 1.16
032 */
033public class ZstdCompressorInputStream extends CompressorInputStream {
034
035    private final ZstdInputStream decIS;
036
037    public ZstdCompressorInputStream(final InputStream in) throws IOException {
038        this.decIS = new ZstdInputStream(in);
039    }
040
041    @Override
042    public int available() throws IOException {
043        return decIS.available();
044    }
045
046    @Override
047    public void close() throws IOException {
048        decIS.close();
049    }
050
051    @Override
052    public int read(final byte[] b) throws IOException {
053        return decIS.read(b);
054    }
055
056    @Override
057    public long skip(final long n) throws IOException {
058        return decIS.skip(n);
059    }
060
061    @Override
062    public void mark(final int readlimit) {
063        decIS.mark(readlimit);
064    }
065
066    @Override
067    public boolean markSupported() {
068        return decIS.markSupported();
069    }
070
071    @Override
072    public int read() throws IOException {
073        final int ret = decIS.read();
074        count(ret == -1 ? 0 : 1);
075        return ret;
076    }
077
078    @Override
079    public int read(final byte[] buf, final int off, final int len) throws IOException {
080        final int ret = decIS.read(buf, off, len);
081        count(ret);
082        return ret;
083    }
084
085    @Override
086    public String toString() {
087        return decIS.toString();
088    }
089
090    @Override
091    public void reset() throws IOException {
092        decIS.reset();
093    }
094
095}