1 /* 2 * LZ4 - Fast LZ compression algorithm 3 * Copyright (C) 2011 - 2016, Yann Collet. 4 * BSD 2 - Clause License (http://www.opensource.org/licenses/bsd - license.php) 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 15 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 17 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 18 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 20 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * You can contact the author at : 26 * - LZ4 homepage : http://www.lz4.org 27 * - LZ4 source repository : https://github.com/lz4/lz4 28 * 29 * Changed for kernel usage by: 30 * Sven Schmidt <4sschmid@informatik.uni-hamburg.de> 31 */ 32 33 /*-************************************ 34 * Dependencies 35 **************************************/ 36 #include <linux/lz4.h> 37 #include "lz4defs.h" 38 #include <linux/init.h> 39 #include <linux/module.h> 40 #include <linux/kernel.h> 41 #include <asm/unaligned.h> 42 43 /*-***************************** 44 * Decompression functions 45 *******************************/ 46 47 #define DEBUGLOG(l, ...) {} /* disabled */ 48 49 #ifndef assert 50 #define assert(condition) ((void)0) 51 #endif 52 53 /* 54 * LZ4_decompress_generic() : 55 * This generic decompression function covers all use cases. 56 * It shall be instantiated several times, using different sets of directives. 57 * Note that it is important for performance that this function really get inlined, 58 * in order to remove useless branches during compilation optimization. 59 */ 60 static FORCE_INLINE int LZ4_decompress_generic( 61 const char * const src, 62 char * const dst, 63 int srcSize, 64 /* 65 * If endOnInput == endOnInputSize, 66 * this value is `dstCapacity` 67 */ 68 int outputSize, 69 /* endOnOutputSize, endOnInputSize */ 70 endCondition_directive endOnInput, 71 /* full, partial */ 72 earlyEnd_directive partialDecoding, 73 /* noDict, withPrefix64k, usingExtDict */ 74 dict_directive dict, 75 /* always <= dst, == dst when no prefix */ 76 const BYTE * const lowPrefix, 77 /* only if dict == usingExtDict */ 78 const BYTE * const dictStart, 79 /* note : = 0 if noDict */ 80 const size_t dictSize 81 ) 82 { 83 const BYTE *ip = (const BYTE *) src; 84 const BYTE * const iend = ip + srcSize; 85 86 BYTE *op = (BYTE *) dst; 87 BYTE * const oend = op + outputSize; 88 BYTE *cpy; 89 90 const BYTE * const dictEnd = (const BYTE *)dictStart + dictSize; 91 static const unsigned int inc32table[8] = {0, 1, 2, 1, 0, 4, 4, 4}; 92 static const int dec64table[8] = {0, 0, 0, -1, -4, 1, 2, 3}; 93 94 const int safeDecode = (endOnInput == endOnInputSize); 95 const int checkOffset = ((safeDecode) && (dictSize < (int)(64 * KB))); 96 97 /* Set up the "end" pointers for the shortcut. */ 98 const BYTE *const shortiend = iend - 99 (endOnInput ? 14 : 8) /*maxLL*/ - 2 /*offset*/; 100 const BYTE *const shortoend = oend - 101 (endOnInput ? 14 : 8) /*maxLL*/ - 18 /*maxML*/; 102 103 DEBUGLOG(5, "%s (srcSize:%i, dstSize:%i)", __func__, 104 srcSize, outputSize); 105 106 /* Special cases */ 107 assert(lowPrefix <= op); 108 assert(src != NULL); 109 110 /* Empty output buffer */ 111 if ((endOnInput) && (unlikely(outputSize == 0))) 112 return ((srcSize == 1) && (*ip == 0)) ? 0 : -1; 113 114 if ((!endOnInput) && (unlikely(outputSize == 0))) 115 return (*ip == 0 ? 1 : -1); 116 117 if ((endOnInput) && unlikely(srcSize == 0)) 118 return -1; 119 120 /* Main Loop : decode sequences */ 121 while (1) { 122 size_t length; 123 const BYTE *match; 124 size_t offset; 125 126 /* get literal length */ 127 unsigned int const token = *ip++; 128 length = token>>ML_BITS; 129 130 /* ip < iend before the increment */ 131 assert(!endOnInput || ip <= iend); 132 133 /* 134 * A two-stage shortcut for the most common case: 135 * 1) If the literal length is 0..14, and there is enough 136 * space, enter the shortcut and copy 16 bytes on behalf 137 * of the literals (in the fast mode, only 8 bytes can be 138 * safely copied this way). 139 * 2) Further if the match length is 4..18, copy 18 bytes 140 * in a similar manner; but we ensure that there's enough 141 * space in the output for those 18 bytes earlier, upon 142 * entering the shortcut (in other words, there is a 143 * combined check for both stages). 144 */ 145 if ((endOnInput ? length != RUN_MASK : length <= 8) 146 /* 147 * strictly "less than" on input, to re-enter 148 * the loop with at least one byte 149 */ 150 && likely((endOnInput ? ip < shortiend : 1) & 151 (op <= shortoend))) { 152 /* Copy the literals */ 153 memcpy(op, ip, endOnInput ? 16 : 8); 154 op += length; ip += length; 155 156 /* 157 * The second stage: 158 * prepare for match copying, decode full info. 159 * If it doesn't work out, the info won't be wasted. 160 */ 161 length = token & ML_MASK; /* match length */ 162 offset = LZ4_readLE16(ip); 163 ip += 2; 164 match = op - offset; 165 assert(match <= op); /* check overflow */ 166 167 /* Do not deal with overlapping matches. */ 168 if ((length != ML_MASK) && 169 (offset >= 8) && 170 (dict == withPrefix64k || match >= lowPrefix)) { 171 /* Copy the match. */ 172 memcpy(op + 0, match + 0, 8); 173 memcpy(op + 8, match + 8, 8); 174 memcpy(op + 16, match + 16, 2); 175 op += length + MINMATCH; 176 /* Both stages worked, load the next token. */ 177 continue; 178 } 179 180 /* 181 * The second stage didn't work out, but the info 182 * is ready. Propel it right to the point of match 183 * copying. 184 */ 185 goto _copy_match; 186 } 187 188 /* decode literal length */ 189 if (length == RUN_MASK) { 190 unsigned int s; 191 192 if (unlikely(endOnInput ? ip >= iend - RUN_MASK : 0)) { 193 /* overflow detection */ 194 goto _output_error; 195 } 196 do { 197 s = *ip++; 198 length += s; 199 } while (likely(endOnInput 200 ? ip < iend - RUN_MASK 201 : 1) & (s == 255)); 202 203 if ((safeDecode) 204 && unlikely((uptrval)(op) + 205 length < (uptrval)(op))) { 206 /* overflow detection */ 207 goto _output_error; 208 } 209 if ((safeDecode) 210 && unlikely((uptrval)(ip) + 211 length < (uptrval)(ip))) { 212 /* overflow detection */ 213 goto _output_error; 214 } 215 } 216 217 /* copy literals */ 218 cpy = op + length; 219 LZ4_STATIC_ASSERT(MFLIMIT >= WILDCOPYLENGTH); 220 221 if (((endOnInput) && ((cpy > oend - MFLIMIT) 222 || (ip + length > iend - (2 + 1 + LASTLITERALS)))) 223 || ((!endOnInput) && (cpy > oend - WILDCOPYLENGTH))) { 224 if (partialDecoding) { 225 if (cpy > oend) { 226 /* 227 * Partial decoding : 228 * stop in the middle of literal segment 229 */ 230 cpy = oend; 231 length = oend - op; 232 } 233 if ((endOnInput) 234 && (ip + length > iend)) { 235 /* 236 * Error : 237 * read attempt beyond 238 * end of input buffer 239 */ 240 goto _output_error; 241 } 242 } else { 243 if ((!endOnInput) 244 && (cpy != oend)) { 245 /* 246 * Error : 247 * block decoding must 248 * stop exactly there 249 */ 250 goto _output_error; 251 } 252 if ((endOnInput) 253 && ((ip + length != iend) 254 || (cpy > oend))) { 255 /* 256 * Error : 257 * input must be consumed 258 */ 259 goto _output_error; 260 } 261 } 262 263 memcpy(op, ip, length); 264 ip += length; 265 op += length; 266 267 /* Necessarily EOF, due to parsing restrictions */ 268 if (!partialDecoding || (cpy == oend)) 269 break; 270 } else { 271 /* may overwrite up to WILDCOPYLENGTH beyond cpy */ 272 LZ4_wildCopy(op, ip, cpy); 273 ip += length; 274 op = cpy; 275 } 276 277 /* get offset */ 278 offset = LZ4_readLE16(ip); 279 ip += 2; 280 match = op - offset; 281 282 /* get matchlength */ 283 length = token & ML_MASK; 284 285 _copy_match: 286 if ((checkOffset) && (unlikely(match + dictSize < lowPrefix))) { 287 /* Error : offset outside buffers */ 288 goto _output_error; 289 } 290 291 /* costs ~1%; silence an msan warning when offset == 0 */ 292 /* 293 * note : when partialDecoding, there is no guarantee that 294 * at least 4 bytes remain available in output buffer 295 */ 296 if (!partialDecoding) { 297 assert(oend > op); 298 assert(oend - op >= 4); 299 300 LZ4_write32(op, (U32)offset); 301 } 302 303 if (length == ML_MASK) { 304 unsigned int s; 305 306 do { 307 s = *ip++; 308 309 if ((endOnInput) && (ip > iend - LASTLITERALS)) 310 goto _output_error; 311 312 length += s; 313 } while (s == 255); 314 315 if ((safeDecode) 316 && unlikely( 317 (uptrval)(op) + length < (uptrval)op)) { 318 /* overflow detection */ 319 goto _output_error; 320 } 321 } 322 323 length += MINMATCH; 324 325 /* match starting within external dictionary */ 326 if ((dict == usingExtDict) && (match < lowPrefix)) { 327 if (unlikely(op + length > oend - LASTLITERALS)) { 328 /* doesn't respect parsing restriction */ 329 if (!partialDecoding) 330 goto _output_error; 331 length = min(length, (size_t)(oend - op)); 332 } 333 334 if (length <= (size_t)(lowPrefix - match)) { 335 /* 336 * match fits entirely within external 337 * dictionary : just copy 338 */ 339 memmove(op, dictEnd - (lowPrefix - match), 340 length); 341 op += length; 342 } else { 343 /* 344 * match stretches into both external 345 * dictionary and current block 346 */ 347 size_t const copySize = (size_t)(lowPrefix - match); 348 size_t const restSize = length - copySize; 349 350 memcpy(op, dictEnd - copySize, copySize); 351 op += copySize; 352 if (restSize > (size_t)(op - lowPrefix)) { 353 /* overlap copy */ 354 BYTE * const endOfMatch = op + restSize; 355 const BYTE *copyFrom = lowPrefix; 356 357 while (op < endOfMatch) 358 *op++ = *copyFrom++; 359 } else { 360 memcpy(op, lowPrefix, restSize); 361 op += restSize; 362 } 363 } 364 continue; 365 } 366 367 /* copy match within block */ 368 cpy = op + length; 369 370 /* 371 * partialDecoding : 372 * may not respect endBlock parsing restrictions 373 */ 374 assert(op <= oend); 375 if (partialDecoding && 376 (cpy > oend - MATCH_SAFEGUARD_DISTANCE)) { 377 size_t const mlen = min(length, (size_t)(oend - op)); 378 const BYTE * const matchEnd = match + mlen; 379 BYTE * const copyEnd = op + mlen; 380 381 if (matchEnd > op) { 382 /* overlap copy */ 383 while (op < copyEnd) 384 *op++ = *match++; 385 } else { 386 memcpy(op, match, mlen); 387 } 388 op = copyEnd; 389 if (op == oend) 390 break; 391 continue; 392 } 393 394 if (unlikely(offset < 8)) { 395 op[0] = match[0]; 396 op[1] = match[1]; 397 op[2] = match[2]; 398 op[3] = match[3]; 399 match += inc32table[offset]; 400 memcpy(op + 4, match, 4); 401 match -= dec64table[offset]; 402 } else { 403 LZ4_copy8(op, match); 404 match += 8; 405 } 406 407 op += 8; 408 409 if (unlikely(cpy > oend - MATCH_SAFEGUARD_DISTANCE)) { 410 BYTE * const oCopyLimit = oend - (WILDCOPYLENGTH - 1); 411 412 if (cpy > oend - LASTLITERALS) { 413 /* 414 * Error : last LASTLITERALS bytes 415 * must be literals (uncompressed) 416 */ 417 goto _output_error; 418 } 419 420 if (op < oCopyLimit) { 421 LZ4_wildCopy(op, match, oCopyLimit); 422 match += oCopyLimit - op; 423 op = oCopyLimit; 424 } 425 while (op < cpy) 426 *op++ = *match++; 427 } else { 428 LZ4_copy8(op, match); 429 if (length > 16) 430 LZ4_wildCopy(op + 8, match + 8, cpy); 431 } 432 op = cpy; /* wildcopy correction */ 433 } 434 435 /* end of decoding */ 436 if (endOnInput) { 437 /* Nb of output bytes decoded */ 438 return (int) (((char *)op) - dst); 439 } else { 440 /* Nb of input bytes read */ 441 return (int) (((const char *)ip) - src); 442 } 443 444 /* Overflow error detected */ 445 _output_error: 446 return (int) (-(((const char *)ip) - src)) - 1; 447 } 448 449 int LZ4_decompress_safe(const char *source, char *dest, 450 int compressedSize, int maxDecompressedSize) 451 { 452 return LZ4_decompress_generic(source, dest, 453 compressedSize, maxDecompressedSize, 454 endOnInputSize, decode_full_block, 455 noDict, (BYTE *)dest, NULL, 0); 456 } 457 458 int LZ4_decompress_safe_partial(const char *src, char *dst, 459 int compressedSize, int targetOutputSize, int dstCapacity) 460 { 461 dstCapacity = min(targetOutputSize, dstCapacity); 462 return LZ4_decompress_generic(src, dst, compressedSize, dstCapacity, 463 endOnInputSize, partial_decode, 464 noDict, (BYTE *)dst, NULL, 0); 465 } 466 467 int LZ4_decompress_fast(const char *source, char *dest, int originalSize) 468 { 469 return LZ4_decompress_generic(source, dest, 0, originalSize, 470 endOnOutputSize, decode_full_block, 471 withPrefix64k, 472 (BYTE *)dest - 64 * KB, NULL, 0); 473 } 474 475 /* ===== Instantiate a few more decoding cases, used more than once. ===== */ 476 477 int LZ4_decompress_safe_withPrefix64k(const char *source, char *dest, 478 int compressedSize, int maxOutputSize) 479 { 480 return LZ4_decompress_generic(source, dest, 481 compressedSize, maxOutputSize, 482 endOnInputSize, decode_full_block, 483 withPrefix64k, 484 (BYTE *)dest - 64 * KB, NULL, 0); 485 } 486 487 static int LZ4_decompress_safe_withSmallPrefix(const char *source, char *dest, 488 int compressedSize, 489 int maxOutputSize, 490 size_t prefixSize) 491 { 492 return LZ4_decompress_generic(source, dest, 493 compressedSize, maxOutputSize, 494 endOnInputSize, decode_full_block, 495 noDict, 496 (BYTE *)dest - prefixSize, NULL, 0); 497 } 498 499 int LZ4_decompress_safe_forceExtDict(const char *source, char *dest, 500 int compressedSize, int maxOutputSize, 501 const void *dictStart, size_t dictSize) 502 { 503 return LZ4_decompress_generic(source, dest, 504 compressedSize, maxOutputSize, 505 endOnInputSize, decode_full_block, 506 usingExtDict, (BYTE *)dest, 507 (const BYTE *)dictStart, dictSize); 508 } 509 510 static int LZ4_decompress_fast_extDict(const char *source, char *dest, 511 int originalSize, 512 const void *dictStart, size_t dictSize) 513 { 514 return LZ4_decompress_generic(source, dest, 515 0, originalSize, 516 endOnOutputSize, decode_full_block, 517 usingExtDict, (BYTE *)dest, 518 (const BYTE *)dictStart, dictSize); 519 } 520 521 /* 522 * The "double dictionary" mode, for use with e.g. ring buffers: the first part 523 * of the dictionary is passed as prefix, and the second via dictStart + dictSize. 524 * These routines are used only once, in LZ4_decompress_*_continue(). 525 */ 526 static FORCE_INLINE 527 int LZ4_decompress_safe_doubleDict(const char *source, char *dest, 528 int compressedSize, int maxOutputSize, 529 size_t prefixSize, 530 const void *dictStart, size_t dictSize) 531 { 532 return LZ4_decompress_generic(source, dest, 533 compressedSize, maxOutputSize, 534 endOnInputSize, decode_full_block, 535 usingExtDict, (BYTE *)dest - prefixSize, 536 (const BYTE *)dictStart, dictSize); 537 } 538 539 static FORCE_INLINE 540 int LZ4_decompress_fast_doubleDict(const char *source, char *dest, 541 int originalSize, size_t prefixSize, 542 const void *dictStart, size_t dictSize) 543 { 544 return LZ4_decompress_generic(source, dest, 545 0, originalSize, 546 endOnOutputSize, decode_full_block, 547 usingExtDict, (BYTE *)dest - prefixSize, 548 (const BYTE *)dictStart, dictSize); 549 } 550 551 /* ===== streaming decompression functions ===== */ 552 553 int LZ4_setStreamDecode(LZ4_streamDecode_t *LZ4_streamDecode, 554 const char *dictionary, int dictSize) 555 { 556 LZ4_streamDecode_t_internal *lz4sd = 557 &LZ4_streamDecode->internal_donotuse; 558 559 lz4sd->prefixSize = (size_t) dictSize; 560 lz4sd->prefixEnd = (const BYTE *) dictionary + dictSize; 561 lz4sd->externalDict = NULL; 562 lz4sd->extDictSize = 0; 563 return 1; 564 } 565 566 /* 567 * *_continue() : 568 * These decoding functions allow decompression of multiple blocks 569 * in "streaming" mode. 570 * Previously decoded blocks must still be available at the memory 571 * position where they were decoded. 572 * If it's not possible, save the relevant part of 573 * decoded data into a safe buffer, 574 * and indicate where it stands using LZ4_setStreamDecode() 575 */ 576 int LZ4_decompress_safe_continue(LZ4_streamDecode_t *LZ4_streamDecode, 577 const char *source, char *dest, int compressedSize, int maxOutputSize) 578 { 579 LZ4_streamDecode_t_internal *lz4sd = 580 &LZ4_streamDecode->internal_donotuse; 581 int result; 582 583 if (lz4sd->prefixSize == 0) { 584 /* The first call, no dictionary yet. */ 585 assert(lz4sd->extDictSize == 0); 586 result = LZ4_decompress_safe(source, dest, 587 compressedSize, maxOutputSize); 588 if (result <= 0) 589 return result; 590 lz4sd->prefixSize = result; 591 lz4sd->prefixEnd = (BYTE *)dest + result; 592 } else if (lz4sd->prefixEnd == (BYTE *)dest) { 593 /* They're rolling the current segment. */ 594 if (lz4sd->prefixSize >= 64 * KB - 1) 595 result = LZ4_decompress_safe_withPrefix64k(source, dest, 596 compressedSize, maxOutputSize); 597 else if (lz4sd->extDictSize == 0) 598 result = LZ4_decompress_safe_withSmallPrefix(source, 599 dest, compressedSize, maxOutputSize, 600 lz4sd->prefixSize); 601 else 602 result = LZ4_decompress_safe_doubleDict(source, dest, 603 compressedSize, maxOutputSize, 604 lz4sd->prefixSize, 605 lz4sd->externalDict, lz4sd->extDictSize); 606 if (result <= 0) 607 return result; 608 lz4sd->prefixSize += result; 609 lz4sd->prefixEnd += result; 610 } else { 611 /* 612 * The buffer wraps around, or they're 613 * switching to another buffer. 614 */ 615 lz4sd->extDictSize = lz4sd->prefixSize; 616 lz4sd->externalDict = lz4sd->prefixEnd - lz4sd->extDictSize; 617 result = LZ4_decompress_safe_forceExtDict(source, dest, 618 compressedSize, maxOutputSize, 619 lz4sd->externalDict, lz4sd->extDictSize); 620 if (result <= 0) 621 return result; 622 lz4sd->prefixSize = result; 623 lz4sd->prefixEnd = (BYTE *)dest + result; 624 } 625 626 return result; 627 } 628 629 int LZ4_decompress_fast_continue(LZ4_streamDecode_t *LZ4_streamDecode, 630 const char *source, char *dest, int originalSize) 631 { 632 LZ4_streamDecode_t_internal *lz4sd = &LZ4_streamDecode->internal_donotuse; 633 int result; 634 635 if (lz4sd->prefixSize == 0) { 636 assert(lz4sd->extDictSize == 0); 637 result = LZ4_decompress_fast(source, dest, originalSize); 638 if (result <= 0) 639 return result; 640 lz4sd->prefixSize = originalSize; 641 lz4sd->prefixEnd = (BYTE *)dest + originalSize; 642 } else if (lz4sd->prefixEnd == (BYTE *)dest) { 643 if (lz4sd->prefixSize >= 64 * KB - 1 || 644 lz4sd->extDictSize == 0) 645 result = LZ4_decompress_fast(source, dest, 646 originalSize); 647 else 648 result = LZ4_decompress_fast_doubleDict(source, dest, 649 originalSize, lz4sd->prefixSize, 650 lz4sd->externalDict, lz4sd->extDictSize); 651 if (result <= 0) 652 return result; 653 lz4sd->prefixSize += originalSize; 654 lz4sd->prefixEnd += originalSize; 655 } else { 656 lz4sd->extDictSize = lz4sd->prefixSize; 657 lz4sd->externalDict = lz4sd->prefixEnd - lz4sd->extDictSize; 658 result = LZ4_decompress_fast_extDict(source, dest, 659 originalSize, lz4sd->externalDict, lz4sd->extDictSize); 660 if (result <= 0) 661 return result; 662 lz4sd->prefixSize = originalSize; 663 lz4sd->prefixEnd = (BYTE *)dest + originalSize; 664 } 665 return result; 666 } 667 668 int LZ4_decompress_safe_usingDict(const char *source, char *dest, 669 int compressedSize, int maxOutputSize, 670 const char *dictStart, int dictSize) 671 { 672 if (dictSize == 0) 673 return LZ4_decompress_safe(source, dest, 674 compressedSize, maxOutputSize); 675 if (dictStart+dictSize == dest) { 676 if (dictSize >= 64 * KB - 1) 677 return LZ4_decompress_safe_withPrefix64k(source, dest, 678 compressedSize, maxOutputSize); 679 return LZ4_decompress_safe_withSmallPrefix(source, dest, 680 compressedSize, maxOutputSize, dictSize); 681 } 682 return LZ4_decompress_safe_forceExtDict(source, dest, 683 compressedSize, maxOutputSize, dictStart, dictSize); 684 } 685 686 int LZ4_decompress_fast_usingDict(const char *source, char *dest, 687 int originalSize, 688 const char *dictStart, int dictSize) 689 { 690 if (dictSize == 0 || dictStart + dictSize == dest) 691 return LZ4_decompress_fast(source, dest, originalSize); 692 693 return LZ4_decompress_fast_extDict(source, dest, originalSize, 694 dictStart, dictSize); 695 } 696 697 #ifndef STATIC 698 EXPORT_SYMBOL(LZ4_decompress_safe); 699 EXPORT_SYMBOL(LZ4_decompress_safe_partial); 700 EXPORT_SYMBOL(LZ4_decompress_fast); 701 EXPORT_SYMBOL(LZ4_setStreamDecode); 702 EXPORT_SYMBOL(LZ4_decompress_safe_continue); 703 EXPORT_SYMBOL(LZ4_decompress_fast_continue); 704 EXPORT_SYMBOL(LZ4_decompress_safe_usingDict); 705 EXPORT_SYMBOL(LZ4_decompress_fast_usingDict); 706 707 MODULE_LICENSE("Dual BSD/GPL"); 708 MODULE_DESCRIPTION("LZ4 decompressor"); 709 #endif 710