1 /** 2 * This file Copyright (c) 2011 Magnolia International 3 * Ltd. (http://www.magnolia-cms.com). All rights reserved. 4 * 5 * 6 * This file is dual-licensed under both the Magnolia 7 * Network Agreement and the GNU General Public License. 8 * You may elect to use one or the other of these licenses. 9 * 10 * This file is distributed in the hope that it will be 11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the 12 * implied warranty of MERCHANTABILITY or FITNESS FOR A 13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT. 14 * Redistribution, except as permitted by whichever of the GPL 15 * or MNA you select, is prohibited. 16 * 17 * 1. For the GPL license (GPL), you can redistribute and/or 18 * modify this file under the terms of the GNU General 19 * Public License, Version 3, as published by the Free Software 20 * Foundation. You should have received a copy of the GNU 21 * General Public License, Version 3 along with this program; 22 * if not, write to the Free Software Foundation, Inc., 51 23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 24 * 25 * 2. For the Magnolia Network Agreement (MNA), this file 26 * and the accompanying materials are made available under the 27 * terms of the MNA which accompanies this distribution, and 28 * is available at http://www.magnolia-cms.com/mna.html 29 * 30 * Any modifications to this file must keep this entire header 31 * intact. 32 * 33 */ 34 package info.magnolia.cms.filters; 35 36 import info.magnolia.cms.filters.RangeSupportFilter.RangeInfo; 37 38 import java.io.IOException; 39 40 import javax.servlet.ServletOutputStream; 41 42 import org.slf4j.Logger; 43 import org.slf4j.LoggerFactory; 44 45 /** 46 * Range limited output stream. Will output only bytes in given range, ignoring the rest. 47 * 48 * @version $Id$ 49 * 50 */ 51 public class RangedOutputStream extends ServletOutputStream { 52 53 private static final Logger log = LoggerFactory.getLogger(RangedOutputStream.class); 54 55 private final ServletOutputStream out; 56 57 private long writtenCount = 0; 58 59 private final RangeInfo range; 60 61 public RangedOutputStream(ServletOutputStream stream, RangeInfo range) { 62 log.debug("Using ranged stream"); 63 out = stream; 64 this.range = range; 65 } 66 67 @Override 68 public void write(int b) throws IOException { 69 if (writtenCount >= range.start && writtenCount <= range.end) { 70 out.write(b); 71 } 72 writtenCount++; 73 } 74 75 @Override 76 public void close() throws IOException { 77 int rangeLen = range.end - range.start; 78 int written = (int) Math.min(rangeLen, writtenCount); 79 log.debug("Closing ranged stream after writing {} bytes into range {} bytes of total {} received bytes", new Object[] { written, rangeLen, writtenCount }); 80 super.close(); 81 } 82 }