David Li | e54acca | 2011-03-18 16:21:06 -0700 | [diff] [blame] | 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 | |