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.utils;
020    
021    import java.io.IOException;
022    import java.io.InputStream;
023    import java.io.OutputStream;
024    
025    /**
026     * Utility functions
027     * @Immutable
028     */
029    public final class IOUtils {
030    
031        /** Private constructor to prevent instantiation of this utility class. */
032        private IOUtils(){
033        }
034    
035        /**
036         * Copies the content of a InputStream into an OutputStream.
037         * Uses a default buffer size of 8024 bytes.
038         *
039         * @param input
040         *            the InputStream to copy
041         * @param output
042         *            the target Stream
043         * @throws IOException
044         *             if an error occurs
045         */
046        public static long copy(final InputStream input, final OutputStream output) throws IOException {
047            return copy(input, output, 8024);
048        }
049    
050        /**
051         * Copies the content of a InputStream into an OutputStream
052         *
053         * @param input
054         *            the InputStream to copy
055         * @param output
056         *            the target Stream
057         * @param buffersize
058         *            the buffer size to use
059         * @throws IOException
060         *             if an error occurs
061         */
062        public static long copy(final InputStream input, final OutputStream output, int buffersize) throws IOException {
063            final byte[] buffer = new byte[buffersize];
064            int n = 0;
065            long count=0;
066            while (-1 != (n = input.read(buffer))) {
067                output.write(buffer, 0, n);
068                count += n;
069            }
070            return count;
071        }
072    }