1 | /*
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2 | * Copyright (c) 2005 Oren J. Maurice <oymaurice@hazorea.org.il>
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3 | *
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4 | * Redistribution and use in source and binary forms, with or without modifica-
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5 | * tion, are permitted provided that the following conditions are met:
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6 | *
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7 | * 1. Redistributions of source code must retain the above copyright notice,
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8 | * this list of conditions and the following disclaimer.
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9 | *
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | *
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14 | * 3. The name of the author may not be used to endorse or promote products
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15 | * derived from this software without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
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19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
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21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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22 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
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25 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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26 | * OF THE POSSIBILITY OF SUCH DAMAGE.
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27 | *
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28 | * Alternatively, the contents of this file may be used under the terms of
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29 | * the GNU General Public License version 2 (the "GPL"), in which case the
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30 | * provisions of the GPL are applicable instead of the above. If you wish to
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31 | * allow the use of your version of this file only under the terms of the
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32 | * GPL and not to allow others to use your version of this file under the
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33 | * BSD license, indicate your decision by deleting the provisions above and
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34 | * replace them with the notice and other provisions required by the GPL. If
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35 | * you do not delete the provisions above, a recipient may use your version
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36 | * of this file under either the BSD or the GPL.
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37 | */
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38 |
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39 | using System;
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40 |
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41 | namespace LZF.NET
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42 | {
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43 |
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44 | /// <summary>
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45 | /// Summary description for CLZF.
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46 | /// </summary>
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47 | public class CLZF
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48 | {
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49 | // CRC32 data & function
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50 | UInt32 []crc_32_tab = new UInt32[256]
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51 | {
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52 | 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
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53 | 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
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54 | 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
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55 | 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
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56 | 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
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57 | 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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58 | 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
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59 | 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
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60 | 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
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61 | 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
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62 | 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
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63 | 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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64 | 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
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65 | 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
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66 | 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
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67 | 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
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68 | 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
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69 | 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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70 | 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
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71 | 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
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72 | 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
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73 | 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
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74 | 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
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75 | 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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76 | 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
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77 | 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
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78 | 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
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79 | 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
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80 | 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
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81 | 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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82 | 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
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83 | 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
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84 | 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
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85 | 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
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86 | 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
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87 | 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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88 | 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
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89 | 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
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90 | 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
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91 | 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
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92 | 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
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93 | 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
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94 | 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
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95 | 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
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96 | 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
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97 | 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
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98 | 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
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99 | 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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100 | 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
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101 | 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
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102 | 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
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103 | 0x2d02ef8d
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104 | };
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105 |
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106 | public UInt32 crc32(UInt32 OldCRC,byte NewData)
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107 | {
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108 | return crc_32_tab[(OldCRC & 0xff) ^ NewData] ^ (OldCRC >> 8);
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109 | }
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110 |
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111 |
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112 | /// <summary>
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113 | /// LZF Compressor
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114 | /// </summary>
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115 |
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116 | UInt32 HLOG=14;
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117 | UInt32 HSIZE=(1<<14);
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118 |
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119 | /*
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120 | * don't play with this unless you benchmark!
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121 | * decompression is not dependent on the hash function
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122 | * the hashing function might seem strange, just believe me
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123 | * it works ;)
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124 | */
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125 | UInt32 MAX_LIT=(1 << 5);
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126 | UInt32 MAX_OFF=(1 << 13);
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127 | UInt32 MAX_REF=((1 << 8) + (1 << 3));
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128 |
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129 | UInt32 FRST(byte[] Array,UInt32 ptr)
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130 | {
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131 | return (UInt32)(((Array[ptr]) << 8) | Array[ptr+1]);
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132 | }
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133 |
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134 | UInt32 NEXT(UInt32 v,byte[] Array,UInt32 ptr)
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135 | {
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136 | return ((v) << 8) | Array[ptr+2];
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137 | }
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138 |
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139 | UInt32 IDX(UInt32 h)
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140 | {
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141 | return ((((h ^ (h << 5)) >> (int) (3*8 - HLOG)) - h*5) & (HSIZE - 1));
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142 | }
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143 |
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144 | /*
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145 | * compressed format
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146 | *
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147 | * 000LLLLL <L+1> ; literal
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148 | * LLLOOOOO oooooooo ; backref L
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149 | * 111OOOOO LLLLLLLL oooooooo ; backref L+7
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150 | *
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151 | */
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152 |
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153 | public int lzf_compress (byte[] in_data, int in_len,byte[] out_data, int out_len)
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154 | {
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155 | int c;
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156 | long []htab=new long[1<<14];
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157 | for (c=0;c<1<<14;c++)
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158 | {
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159 | htab[c]=0;
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160 | }
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161 |
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162 | long hslot;
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163 | UInt32 iidx = 0;
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164 | UInt32 oidx = 0;
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165 | //byte *in_end = ip + in_len;
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166 | //byte *out_end = op + out_len;
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167 | long reference;
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168 |
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169 | UInt32 hval = FRST (in_data,iidx);
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170 | long off;
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171 | int lit = 0;
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172 |
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173 | for (;;)
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174 | {
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175 | if (iidx < in_len - 2)
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176 | {
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177 | hval = NEXT (hval, in_data,iidx);
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178 | hslot = IDX (hval);
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179 | reference = htab[hslot];
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180 | htab[hslot] = (long)iidx;
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181 |
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182 | if ((off = iidx - reference - 1) < MAX_OFF
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183 | && iidx + 4 < in_len
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184 | && reference > 0
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185 | && in_data[reference+0] == in_data[iidx+0]
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186 | && in_data[reference+1] == in_data[iidx+1]
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187 | && in_data[reference+2] == in_data[iidx+2]
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188 | )
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189 | {
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190 | /* match found at *reference++ */
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191 | UInt32 len = 2;
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192 | UInt32 maxlen = (UInt32)in_len - iidx - len;
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193 | maxlen = maxlen > MAX_REF ? MAX_REF : maxlen;
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194 |
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195 | if (oidx + lit + 1 + 3 >= out_len)
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196 | return 0;
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197 |
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198 | do
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199 | len++;
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200 | while (len < maxlen && in_data[reference+len] == in_data[iidx+len]);
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201 |
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202 | if (lit!=0)
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203 | {
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204 | out_data[oidx++] = (byte)(lit - 1);
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205 | lit = -lit;
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206 | do
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207 | out_data[oidx++] = in_data[iidx+lit];
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208 | while ((++lit)!=0);
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209 | }
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210 |
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211 | len -= 2;
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212 | iidx++;
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213 |
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214 | if (len < 7)
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215 | {
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216 | out_data[oidx++] = (byte)((off >> 8) + (len << 5));
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217 | }
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218 | else
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219 | {
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220 | out_data[oidx++] = (byte)((off >> 8) + ( 7 << 5));
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221 | out_data[oidx++] = (byte)(len - 7);
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222 | }
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223 |
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224 | out_data[oidx++] = (byte)off;
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225 |
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226 | iidx += len-1;
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227 | hval = FRST (in_data,iidx);
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228 |
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229 | hval = NEXT (hval,in_data, iidx);
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230 | htab[IDX (hval)] = iidx;
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231 | iidx++;
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232 |
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233 | hval = NEXT (hval, in_data,iidx);
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234 | htab[IDX (hval)] = iidx;
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235 | iidx++;
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236 | continue;
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237 | }
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238 | }
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239 | else if (iidx == in_len)
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240 | break;
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241 |
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242 | /* one more literal byte we must copy */
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243 | lit++;
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244 | iidx++;
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245 |
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246 | if (lit == MAX_LIT)
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247 | {
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248 | if (oidx + 1 + MAX_LIT >= out_len)
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249 | return 0;
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250 |
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251 | out_data[oidx++] = (byte)(MAX_LIT - 1);
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252 | lit = -lit;
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253 | do
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254 | out_data[oidx++] = in_data[iidx+lit];
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255 | while ((++lit)!=0);
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256 | }
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257 | }
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258 |
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259 | if (lit!=0)
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260 | {
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261 | if (oidx + lit + 1 >= out_len)
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262 | return 0;
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263 |
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264 | out_data[oidx++] = (byte)(lit - 1);
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265 | lit = -lit;
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266 | do
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267 | out_data[oidx++] = in_data[iidx+lit];
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268 | while ((++lit)!=0);
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269 | }
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270 |
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271 | return (int)oidx;
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272 | }
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273 |
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274 | /// <summary>
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275 | /// LZF Decompressor
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276 | /// </summary>
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277 | public int lzf_decompress ( byte[] in_data, int in_len, byte[] out_data, int out_len)
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278 | {
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279 | UInt32 iidx=0;
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280 | UInt32 oidx=0;
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281 |
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282 | do
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283 | {
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284 | UInt32 ctrl = in_data[iidx++];
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285 |
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286 | if (ctrl < (1 << 5)) /* literal run */
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287 | {
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288 | ctrl++;
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289 |
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290 | if (oidx + ctrl > out_len)
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291 | {
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292 | //SET_ERRNO (E2BIG);
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293 | return 0;
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294 | }
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295 |
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296 | do
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297 | out_data[oidx++] = in_data[iidx++];
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298 | while ((--ctrl)!=0);
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299 | }
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300 | else /* back reference */
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301 | {
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302 | UInt32 len = ctrl >> 5;
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303 |
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304 | int reference = (int)(oidx - ((ctrl & 0x1f) << 8) - 1);
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305 |
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306 | if (len == 7)
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307 | len += in_data[iidx++];
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308 |
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309 | reference -= in_data[iidx++];
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310 |
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311 | if (oidx + len + 2 > out_len)
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312 | {
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313 | //SET_ERRNO (E2BIG);
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314 | return 0;
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315 | }
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316 |
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317 | if (reference < 0)
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318 | {
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319 | //SET_ERRNO (EINVAL);
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320 | return 0;
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321 | }
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322 |
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323 | out_data[oidx++]=out_data[reference++];
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324 | out_data[oidx++]=out_data[reference++];
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325 |
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326 | do
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327 | out_data[oidx++]=out_data[reference++];
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328 | while ((--len)!=0);
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329 | }
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330 | }
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331 | while (iidx < in_len);
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332 |
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333 | return (int)oidx;
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334 | }
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335 |
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336 | public CLZF()
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337 | {
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338 | //
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339 | // TODO: Add ructor logic here
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340 | //
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341 | }
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342 | }
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343 | }
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344 |
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