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annotate src/main/java/com/glavsoft/rfb/encoding/decoder/ZlibDecoder.java @ 57:17b702648079

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version2.7.2 original version.
author Taninari YU <you@cr.ie.u-ryukyu.ac.jp>
date Sun, 15 Dec 2013 18:04:03 +0900
parents 4689cc86d6cb
children 433c79184c05
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rev   line source
57
17b702648079 version2.7.2 original version.
Taninari YU <you@cr.ie.u-ryukyu.ac.jp>
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1 // Copyright (C) 2010, 2011, 2012, 2013 GlavSoft LLC.
0
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2 // All rights reserved.
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3 //
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4 //-------------------------------------------------------------------------
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5 // This file is part of the TightVNC software. Please visit our Web site:
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6 //
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7 // http://www.tightvnc.com/
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8 //
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9 // This program is free software; you can redistribute it and/or modify
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10 // it under the terms of the GNU General Public License as published by
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11 // the Free Software Foundation; either version 2 of the License, or
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12 // (at your option) any later version.
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13 //
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14 // This program is distributed in the hope that it will be useful,
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15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 // GNU General Public License for more details.
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18 //
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19 // You should have received a copy of the GNU General Public License along
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20 // with this program; if not, write to the Free Software Foundation, Inc.,
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21 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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22 //-------------------------------------------------------------------------
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23 //
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24
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25 package com.glavsoft.rfb.encoding.decoder;
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26
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27 import com.glavsoft.drawing.Renderer;
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28 import com.glavsoft.exceptions.TransportException;
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29 import com.glavsoft.transport.Reader;
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30
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31 import java.io.ByteArrayInputStream;
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32 import java.util.zip.DataFormatException;
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33 import java.util.zip.Inflater;
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34
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35 public class ZlibDecoder extends Decoder {
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36 private Inflater decoder;
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37
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38 @Override
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39 public void decode(Reader reader, Renderer renderer,
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40 FramebufferUpdateRectangle rect) throws TransportException {
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41 int zippedLength = (int) reader.readUInt32();
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42 if (0 == zippedLength) return;
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43 int length = rect.width * rect.height * renderer.getBytesPerPixel();
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44 byte[] bytes = unzip(reader, zippedLength, length);
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45 Reader unzippedReader =
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46 new Reader(
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47 new ByteArrayInputStream(bytes, zippedLength, length));
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48 RawDecoder.getInstance().decode(unzippedReader, renderer, rect);
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49 }
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50
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51 protected byte[] unzip(Reader reader, int zippedLength, int length)
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52 throws TransportException {
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53 byte [] bytes = ByteBuffer.getInstance().getBuffer(zippedLength + length);
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54 reader.readBytes(bytes, 0, zippedLength);
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55 if (null == decoder) {
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56 decoder = new Inflater();
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57 }
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58 decoder.setInput(bytes, 0, zippedLength);
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59 try {
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60 decoder.inflate(bytes, zippedLength, length);
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61 } catch (DataFormatException e) {
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62 throw new TransportException("cannot inflate Zlib data", e);
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63 }
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64 return bytes;
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65 }
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66
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67 @Override
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68 public void reset() {
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69 decoder = null;
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70 }
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71
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72 }