1 /* 2 * Copyright (c) 2005 Oren J. Maurice <oymaurice@hazorea.org.il> 3 * 4 * Redistribution and use in source and binary forms, with or without modifica- 5 * tion, are permitted provided that the following conditions are met: 6 * 7 * 1. Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- 19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- 21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- 25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 26 * OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Alternatively, the contents of this file may be used under the terms of 29 * the GNU General Public License version 2 (the "GPL"), in which case the 30 * provisions of the GPL are applicable instead of the above. If you wish to 31 * allow the use of your version of this file only under the terms of the 32 * GPL and not to allow others to use your version of this file under the 33 * BSD license, indicate your decision by deleting the provisions above and 34 * replace them with the notice and other provisions required by the GPL. If 35 * you do not delete the provisions above, a recipient may use your version 36 * of this file under either the BSD or the GPL. 37 */ 38 39 using System; 40 41 namespace LZF.NET 42 { 43 44 /// <summary> 45 /// Summary description for CLZF. 46 /// </summary> 47 public class CLZF 48 { 49 // CRC32 data & function 50 UInt32 []crc_32_tab = new UInt32[256] 51 { 52 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 53 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 54 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 55 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 56 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 57 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 58 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 59 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 60 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 61 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 62 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 63 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 64 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 65 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 66 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, 67 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 68 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 69 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 70 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 71 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 72 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 73 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 74 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 75 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 76 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 77 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 78 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 79 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 80 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, 81 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 82 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 83 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 84 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 85 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 86 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 87 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 88 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 89 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 90 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 91 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 92 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 93 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 94 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 95 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 96 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, 97 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 98 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 99 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 100 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 101 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 102 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 103 0x2d02ef8d 104 }; 105 106 public UInt32 crc32(UInt32 OldCRC,byte NewData) 107 { 108 return crc_32_tab[(OldCRC & 0xff) ^ NewData] ^ (OldCRC >> 8); 109 } 110 111 112 /// <summary> 113 /// LZF Compressor 114 /// </summary> 115 116 UInt32 HLOG=14; 117 UInt32 HSIZE=(1<<14); 118 119 /* 120 * don't play with this unless you benchmark! 121 * decompression is not dependent on the hash function 122 * the hashing function might seem strange, just believe me 123 * it works ;) 124 */ 125 UInt32 MAX_LIT=(1 << 5); 126 UInt32 MAX_OFF=(1 << 13); 127 UInt32 MAX_REF=((1 << 8) + (1 << 3)); 128 129 UInt32 FRST(byte[] Array,UInt32 ptr) 130 { 131 return (UInt32)(((Array[ptr]) << 8) | Array[ptr+1]); 132 } 133 134 UInt32 NEXT(UInt32 v,byte[] Array,UInt32 ptr) 135 { 136 return ((v) << 8) | Array[ptr+2]; 137 } 138 139 UInt32 IDX(UInt32 h) 140 { 141 return ((h ^ (h << 5)) >> (int)(((3*8 - HLOG)) - h*5) & (HSIZE - 1)); 142 } 143 144 /* 145 * compressed format 146 * 147 * 000LLLLL <L+1> ; literal 148 * LLLOOOOO oooooooo ; backref L 149 * 111OOOOO LLLLLLLL oooooooo ; backref L+7 150 * 151 */ 152 153 public int lzf_compress (byte[] in_data, int in_len,byte[] out_data, int out_len) 154 { 155 int c; 156 long []htab=new long[1<<14]; 157 for (c=0;c<1<<14;c++) 158 { 159 htab[c]=0; 160 } 161 162 long hslot; 163 UInt32 iidx = 0; 164 UInt32 oidx = 0; 165 //byte *in_end = ip + in_len; 166 //byte *out_end = op + out_len; 167 long reference; 168 169 UInt32 hval = FRST (in_data,iidx); 170 long off; 171 int lit = 0; 172 173 for (;;) 174 { 175 if (iidx < in_len - 2) 176 { 177 hval = NEXT (hval, in_data,iidx); 178 hslot = IDX (hval); 179 reference = htab[hslot]; 180 htab[hslot] = (long)iidx; 181 182 if ((off = iidx - reference - 1) < MAX_OFF 183 && iidx + 4 < in_len 184 && reference > 0 185 && in_data[reference+0] == in_data[iidx+0] 186 && in_data[reference+1] == in_data[iidx+1] 187 && in_data[reference+2] == in_data[iidx+2] 188 ) 189 { 190 /* match found at *reference++ */ 191 UInt32 len = 2; 192 UInt32 maxlen = (UInt32)in_len - iidx - len; 193 maxlen = maxlen > MAX_REF ? MAX_REF : maxlen; 194 195 if (oidx + lit + 1 + 3 >= out_len) 196 return 0; 197 198 do 199 len++; 200 while (len < maxlen && in_data[reference+len] == in_data[iidx+len]); 201 202 if (lit!=0) 203 { 204 out_data[oidx++] = (byte)(lit - 1); 205 lit = -lit; 206 do 207 out_data[oidx++] = in_data[iidx+lit]; 208 while ((++lit)!=0); 209 } 210 211 len -= 2; 212 iidx++; 213 214 if (len < 7) 215 { 216 out_data[oidx++] = (byte)((off >> 8) + (len << 5)); 217 } 218 else 219 { 220 out_data[oidx++] = (byte)((off >> 8) + ( 7 << 5)); 221 out_data[oidx++] = (byte)(len - 7); 222 } 223 224 out_data[oidx++] = (byte)off; 225 226 iidx += len-1; 227 hval = FRST (in_data,iidx); 228 229 hval = NEXT (hval,in_data, iidx); 230 htab[IDX (hval)] = iidx; 231 iidx++; 232 233 hval = NEXT (hval, in_data,iidx); 234 htab[IDX (hval)] = iidx; 235 iidx++; 236 continue; 237 } 238 } 239 else if (iidx == in_len) 240 break; 241 242 /* one more literal byte we must copy */ 243 lit++; 244 iidx++; 245 246 if (lit == MAX_LIT) 247 { 248 if (oidx + 1 + MAX_LIT >= out_len) 249 return 0; 250 251 out_data[oidx++] = (byte)(MAX_LIT - 1); 252 lit = -lit; 253 do 254 out_data[oidx++] = in_data[iidx+lit]; 255 while ((++lit)!=0); 256 } 257 } 258 259 if (lit!=0) 260 { 261 if (oidx + lit + 1 >= out_len) 262 return 0; 263 264 out_data[oidx++] = (byte)(lit - 1); 265 lit = -lit; 266 do 267 out_data[oidx++] = in_data[iidx+lit]; 268 while ((++lit)!=0); 269 } 270 271 return (int)oidx; 272 } 273 274 /// <summary> 275 /// LZF Decompressor 276 /// </summary> 277 public int lzf_decompress ( byte[] in_data, int in_len, byte[] out_data, int out_len) 278 { 279 UInt32 iidx=0; 280 UInt32 oidx=0; 281 282 do 283 { 284 UInt32 ctrl = in_data[iidx++]; 285 286 if (ctrl < (1 << 5)) /* literal run */ 287 { 288 ctrl++; 289 290 if (oidx + ctrl > out_len) 291 { 292 //SET_ERRNO (E2BIG); 293 return 0; 294 } 295 296 do 297 out_data[oidx++] = in_data[iidx++]; 298 while ((--ctrl)!=0); 299 } 300 else /* back reference */ 301 { 302 UInt32 len = ctrl >> 5; 303 304 int reference = (int)(oidx - ((ctrl & 0x1f) << 8) - 1); 305 306 if (len == 7) 307 len += in_data[iidx++]; 308 309 reference -= in_data[iidx++]; 310 311 if (oidx + len + 2 > out_len) 312 { 313 //SET_ERRNO (E2BIG); 314 return 0; 315 } 316 317 if (reference < 0) 318 { 319 //SET_ERRNO (EINVAL); 320 return 0; 321 } 322 323 out_data[oidx++]=out_data[reference++]; 324 out_data[oidx++]=out_data[reference++]; 325 326 do 327 out_data[oidx++]=out_data[reference++]; 328 while ((--len)!=0); 329 } 330 } 331 while (iidx < in_len); 332 333 return (int)oidx; 334 } 335 336 public CLZF() 337 { 338 // 339 // TODO: Add ructor logic here 340 // 341 } 342 } 343 } 344 345