Mercurial > fife-parpg
annotate engine/core/vfs/dat/lzssdecoder.cpp @ 308:af0b233e246f
- added a workaround for the rotation issue of groundtiles in rio de hola maps
author | chewie@33b003aa-7bff-0310-803a-e67f0ece8222 |
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date | Tue, 11 Aug 2009 17:08:21 +0000 |
parents | 90005975cdbb |
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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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24 |
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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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30 |
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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 { |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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99 i = in[ibuf++]; |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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100 j = in[ibuf++]; |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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101 |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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102 i |= ((j & 0xf0) << 4); |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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103 j = (j & 0x0f) + c_nThreshold; |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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104 |
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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105 for (k = 0; k <= j; k++) { |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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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:
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107 |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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108 out[m_outindex++] = c; |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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109 |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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110 buffer[r++] = c; |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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111 r &= (c_nRingBufferSize - 1); |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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112 } |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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113 } |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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114 } |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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115 } |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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116 |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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117 |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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118 } |