    001    /*
    002     * Licensed to the Apache Software Foundation (ASF) under one
    003     * or more contributor license agreements.  See the NOTICE file
    004     * distributed with this work for additional information
    005     * regarding copyright ownership.  The ASF licenses this file
    006     * to you under the Apache License, Version 2.0 (the
    007     * "License"); you may not use this file except in compliance
    008     * with the License.  You may obtain a copy of the License at
    009     *
    010     * http://www.apache.org/licenses/LICENSE-2.0
    011     *
    012     * Unless required by applicable law or agreed to in writing,
    013     * software distributed under the License is distributed on an
    014     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    015     * KIND, either express or implied.  See the License for the
    016     * specific language governing permissions and limitations
    017     * under the License.
    018     */
    019    package org.apache.commons.compress.compressors.gzip;
    020
    021    import java.io.IOException;
    022    import java.io.InputStream;
    023    import java.util.zip.GZIPInputStream;
    024
    025    import org.apache.commons.compress.compressors.CompressorInputStream;
    026
    027    /**
    028     * Implements the "gz" compression format as an input stream.
    029     * This classes wraps the standard java classes for working with gz.
    030     */
    031    public class GzipCompressorInputStream extends CompressorInputStream {
    032        /* reference to the compressed stream */
    033        private final GZIPInputStream in;
    034
    035        /**
    036         * Constructs a new GZip compressed input stream by the referenced
    037         * InputStream.
    038         *
    039         * @param inputStream the InputStream from which this object should be created of
    040         * @throws IOException if the stream could not be created
    041         */
    042        public GzipCompressorInputStream(InputStream inputStream) throws IOException {
    043            in = new GZIPInputStream(inputStream);
    044        }
    045
    046        /* (non-Javadoc)
    047         * @see java.io.InputStream#read()
    048         */
    049        public int read() throws IOException {
    050            this.count(1);
    051            return in.read();
    052        }
    053    }