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annotate engine/core/vfs/dat/lzssdecoder.cpp @ 697:ecaa4d98f05f tip

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Abstracted the GUI code and refactored the GUIChan-specific code into its own module. * Most of the GUIChan code has been refactored into its own gui/guichan module. However, references to the GuiFont class still persist in the Engine and GuiManager code and these will need further refactoring. * GuiManager is now an abstract base class which specific implementations (e.g. GUIChan) should subclass. * The GUIChan GUI code is now a concrete implementation of GuiManager, most of which is in the new GuiChanGuiManager class. * The GUI code in the Console class has been refactored out of the Console and into the GUIChan module as its own GuiChanConsoleWidget class. The rest of the Console class related to executing commands was left largely unchanged. * Existing client code may need to downcast the GuiManager pointer received from FIFE::Engine::getGuiManager() to GuiChanGuiManager, since not all functionality is represented in the GuiManager abstract base class. Python client code can use the new GuiChanGuiManager.castTo static method for this purpose.
author M. George Hansen <technopolitica@gmail.com>
date Sat, 18 Jun 2011 00:28:40 -1000
parents 90005975cdbb
children
rev   line source
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1 /***************************************************************************
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2 * Copyright (C) 2005-2008 by the FIFE team *
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3 * http://www.fifengine.de *
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4 * This file is part of FIFE. *
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5 * *
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6 * FIFE is free software; you can redistribute it and/or *
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7 * modify it under the terms of the GNU Lesser General Public *
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8 * License as published by the Free Software Foundation; either *
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9 * version 2.1 of the License, or (at your option) any later version. *
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10 * *
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11 * This library is distributed in the hope that it will be useful, *
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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14 * Lesser General Public License for more details. *
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15 * *
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16 * You should have received a copy of the GNU Lesser General Public *
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17 * License along with this library; if not, write to the *
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18 * Free Software Foundation, Inc., *
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19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
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20 ***************************************************************************/
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21
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22 // Standard C++ library includes
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23 #include <algorithm>
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25 // 3rd party library includes
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26
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27 // FIFE includes
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28 #include "vfs/raw/rawdata.h"
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29 #include "util/base/exception.h"
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31 #include "lzssdecoder.h"
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32
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33 // just a quick&dirty wrapper around anchorites implementation - needs to be replaced with our own LZSS implementation
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34 namespace FIFE {
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35
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36 LZSSDecoder::LZSSDecoder() {}
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37 LZSSDecoder::~LZSSDecoder() {}
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38
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39
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40 void LZSSDecoder::decode(RawData* input, uint8_t* output, const uint32_t outputsize) {
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41
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42 m_outindex = 0;
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43 m_outlen = outputsize;
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44
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45 while (m_outindex < outputsize) {
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46 uint16_t blockdesc = input->read16Big();
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47 uint16_t bytesToRead = blockdesc & 0x7fff;
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48
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49 if (blockdesc & 0x8000) { // uncompressed
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50 input->readInto(output + m_outindex, bytesToRead);
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51 m_outindex += bytesToRead;
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52 } else {
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53 // Allocate +2 bytes so that on corrupt data the LZSS
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54 // decoder won't crash the input buffer.
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55 std::vector<uint8_t> indata(bytesToRead + 2);
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56 input->readInto(&indata[0], bytesToRead);
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57 LZSSDecode(&indata[0], bytesToRead, output);
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58 // Note outindex is advanced inside LZSSDecode.
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59 }
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60
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61 }
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62 }
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63
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64 void LZSSDecoder::LZSSDecode(uint8_t* in , long len, uint8_t* out) {
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65 const long c_nRingBufferSize = 4096;
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66 const long c_nMatchLengthUpperLimit = 18;
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67 const long c_nThreshold = 2;
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68
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69 char buffer[c_nRingBufferSize + c_nMatchLengthUpperLimit - 1];
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70 int ibuf = 0;
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71 int c;
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72
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73 int i;
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74 int j;
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75 int k;
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76 int r;
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77
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78 unsigned int flags;
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79
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80 for (i = 0; i < c_nRingBufferSize - c_nMatchLengthUpperLimit; i++) {
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81 buffer[i] = ' ';
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82 }
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83
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84 r = c_nRingBufferSize - c_nMatchLengthUpperLimit;
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85 flags = 0;
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86 while ( ibuf < len ) {
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87 if (((flags >>= 1) & 256) == 0) {
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88 c = in[ibuf++];
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89 flags = c | 0xff00;/* uses higher byte cleverly to count eight */
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90 }
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91
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92 if (flags & 1) {
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93 c = in[ibuf++];
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94 out[m_outindex++] = c;
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95
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96 buffer[r++] = c;
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97 r &= (c_nRingBufferSize - 1);
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98 } else {
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99 i = in[ibuf++];
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100 j = in[ibuf++];
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101
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102 i |= ((j & 0xf0) << 4);
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103 j = (j & 0x0f) + c_nThreshold;
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104
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105 for (k = 0; k <= j; k++) {
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106 c = buffer[(i + k) & (c_nRingBufferSize - 1)];
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
107
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
108 out[m_outindex++] = c;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
109
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
110 buffer[r++] = c;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
111 r &= (c_nRingBufferSize - 1);
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
112 }
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
113 }
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
114 }
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
115 }
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
116
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
117
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
118 }