target/linux/generic-2.4/patches/002-squashfs_lzma.patch

   1 --- a/fs/squashfs/inode.c
   2 +++ b/fs/squashfs/inode.c
   3 @@ -4,6 +4,9 @@
   4   * Copyright (c) 2002, 2003, 2004, 2005, 2006
   5   * Phillip Lougher <phillip@lougher.org.uk>
   6   *
   7 + * LZMA decompressor support added by Oleg I. Vdovikin
   8 + * Copyright (c) 2005 Oleg I.Vdovikin <oleg@cs.msu.su>
   9 + *
  10   * This program is free software; you can redistribute it and/or
  11   * modify it under the terms of the GNU General Public License
  12   * as published by the Free Software Foundation; either version 2,
  13 @@ -21,6 +24,7 @@
  14   * inode.c
  15   */
  16
  17 +#define SQUASHFS_LZMA
  18  #include <linux/types.h>
  19  #include <linux/squashfs_fs.h>
  20  #include <linux/module.h>
  21 @@ -40,6 +44,20 @@
  22
  23  #include "squashfs.h"
  24
  25 +#ifdef SQUASHFS_LZMA
  26 +#include "LzmaDecode.h"
  27 +
  28 +/* default LZMA settings, should be in sync with mksquashfs */
  29 +#define LZMA_LC 3
  30 +#define LZMA_LP 0
  31 +#define LZMA_PB 2
  32 +
  33 +#define LZMA_WORKSPACE_SIZE ((LZMA_BASE_SIZE + \
  34 +      (LZMA_LIT_SIZE << (LZMA_LC + LZMA_LP))) * sizeof(CProb))
  35 +
  36 +#endif
  37 +
  38 +
  39  static struct super_block *squashfs_read_super(struct super_block *, void *, int);
  40  static void squashfs_put_super(struct super_block *);
  41  static int squashfs_statfs(struct super_block *, struct statfs *);
  42 @@ -53,7 +71,11 @@ static long long read_blocklist(struct i
  43                                 int readahead_blks, char *block_list,
  44                                 unsigned short **block_p, unsigned int *bsize);
  45
  46 +#ifdef SQUASHFS_LZMA
  47 +static unsigned char lzma_workspace[LZMA_WORKSPACE_SIZE];
  48 +#else
  49  static z_stream stream;
  50 +#endif
  51
  52  static DECLARE_FSTYPE_DEV(squashfs_fs_type, "squashfs", squashfs_read_super);
  53
  54 @@ -229,6 +251,15 @@ SQSH_EXTERN unsigned int squashfs_read_d
  55         if (compressed) {
  56                 int zlib_err;
  57
  58 +#ifdef SQUASHFS_LZMA
  59 +               if ((zlib_err = LzmaDecode(lzma_workspace,
  60 +                       LZMA_WORKSPACE_SIZE, LZMA_LC, LZMA_LP, LZMA_PB,
  61 +                       c_buffer, c_byte, buffer, msblk->read_size, &bytes)) != LZMA_RESULT_OK)
  62 +               {
  63 +                       ERROR("lzma returned unexpected result 0x%x\n", zlib_err);
  64 +                       bytes = 0;
  65 +               }
  66 +#else
  67                 stream.next_in = c_buffer;
  68                 stream.avail_in = c_byte;
  69                 stream.next_out = buffer;
  70 @@ -243,6 +274,7 @@ SQSH_EXTERN unsigned int squashfs_read_d
  71                         bytes = 0;
  72                 } else
  73                         bytes = stream.total_out;
  74 +#endif
  75
  76                 up(&msblk->read_data_mutex);
  77         }
  78 @@ -2004,17 +2036,21 @@ static int __init init_squashfs_fs(void)
  79         printk(KERN_INFO "squashfs: version 3.0 (2006/03/15) "
  80                 "Phillip Lougher\n");
  81
  82 +#ifndef SQUASHFS_LZMA
  83         if (!(stream.workspace = vmalloc(zlib_inflate_workspacesize()))) {
  84                 ERROR("Failed to allocate zlib workspace\n");
  85                 return -ENOMEM;
  86         }
  87 +#endif
  88         return register_filesystem(&squashfs_fs_type);
  89  }
  90
  91
  92  static void __exit exit_squashfs_fs(void)
  93  {
  94 +#ifndef SQUASHFS_LZMA
  95         vfree(stream.workspace);
  96 +#endif
  97         unregister_filesystem(&squashfs_fs_type);
  98  }
  99
 100 --- /dev/null
 101 +++ b/fs/squashfs/LzmaDecode.c
 102 @@ -0,0 +1,663 @@
 103 +/*
 104 +  LzmaDecode.c
 105 +  LZMA Decoder
 106 +
 107 +  LZMA SDK 4.05 Copyright (c) 1999-2004 Igor Pavlov (2004-08-25)
 108 +  http://www.7-zip.org/
 109 +
 110 +  LZMA SDK is licensed under two licenses:
 111 +  1) GNU Lesser General Public License (GNU LGPL)
 112 +  2) Common Public License (CPL)
 113 +  It means that you can select one of these two licenses and
 114 +  follow rules of that license.
 115 +
 116 +  SPECIAL EXCEPTION:
 117 +  Igor Pavlov, as the author of this code, expressly permits you to
 118 +  statically or dynamically link your code (or bind by name) to the
 119 +  interfaces of this file without subjecting your linked code to the
 120 +  terms of the CPL or GNU LGPL. Any modifications or additions
 121 +  to this file, however, are subject to the LGPL or CPL terms.
 122 +*/
 123 +
 124 +#include "LzmaDecode.h"
 125 +
 126 +#ifndef Byte
 127 +#define Byte unsigned char
 128 +#endif
 129 +
 130 +#define kNumTopBits 24
 131 +#define kTopValue ((UInt32)1 << kNumTopBits)
 132 +
 133 +#define kNumBitModelTotalBits 11
 134 +#define kBitModelTotal (1 << kNumBitModelTotalBits)
 135 +#define kNumMoveBits 5
 136 +
 137 +typedef struct _CRangeDecoder
 138 +{
 139 +  Byte *Buffer;
 140 +  Byte *BufferLim;
 141 +  UInt32 Range;
 142 +  UInt32 Code;
 143 +  #ifdef _LZMA_IN_CB
 144 +  ILzmaInCallback *InCallback;
 145 +  int Result;
 146 +  #endif
 147 +  int ExtraBytes;
 148 +} CRangeDecoder;
 149 +
 150 +Byte RangeDecoderReadByte(CRangeDecoder *rd)
 151 +{
 152 +  if (rd->Buffer == rd->BufferLim)
 153 +  {
 154 +    #ifdef _LZMA_IN_CB
 155 +    UInt32 size;
 156 +    rd->Result = rd->InCallback->Read(rd->InCallback, &rd->Buffer, &size);
 157 +    rd->BufferLim = rd->Buffer + size;
 158 +    if (size == 0)
 159 +    #endif
 160 +    {
 161 +      rd->ExtraBytes = 1;
 162 +      return 0xFF;
 163 +    }
 164 +  }
 165 +  return (*rd->Buffer++);
 166 +}
 167 +
 168 +/* #define ReadByte (*rd->Buffer++) */
 169 +#define ReadByte (RangeDecoderReadByte(rd))
 170 +
 171 +void RangeDecoderInit(CRangeDecoder *rd,
 172 +  #ifdef _LZMA_IN_CB
 173 +    ILzmaInCallback *inCallback
 174 +  #else
 175 +    Byte *stream, UInt32 bufferSize
 176 +  #endif
 177 +    )
 178 +{
 179 +  int i;
 180 +  #ifdef _LZMA_IN_CB
 181 +  rd->InCallback = inCallback;
 182 +  rd->Buffer = rd->BufferLim = 0;
 183 +  #else
 184 +  rd->Buffer = stream;
 185 +  rd->BufferLim = stream + bufferSize;
 186 +  #endif
 187 +  rd->ExtraBytes = 0;
 188 +  rd->Code = 0;
 189 +  rd->Range = (0xFFFFFFFF);
 190 +  for(i = 0; i < 5; i++)
 191 +    rd->Code = (rd->Code << 8) | ReadByte;
 192 +}
 193 +
 194 +#define RC_INIT_VAR UInt32 range = rd->Range; UInt32 code = rd->Code;
 195 +#define RC_FLUSH_VAR rd->Range = range; rd->Code = code;
 196 +#define RC_NORMALIZE if (range < kTopValue) { range <<= 8; code = (code << 8) | ReadByte; }
 197 +
 198 +UInt32 RangeDecoderDecodeDirectBits(CRangeDecoder *rd, int numTotalBits)
 199 +{
 200 +  RC_INIT_VAR
 201 +  UInt32 result = 0;
 202 +  int i;
 203 +  for (i = numTotalBits; i > 0; i--)
 204 +  {
 205 +    /* UInt32 t; */
 206 +    range >>= 1;
 207 +
 208 +    result <<= 1;
 209 +    if (code >= range)
 210 +    {
 211 +      code -= range;
 212 +      result |= 1;
 213 +    }
 214 +    /*
 215 +    t = (code - range) >> 31;
 216 +    t &= 1;
 217 +    code -= range & (t - 1);
 218 +    result = (result + result) | (1 - t);
 219 +    */
 220 +    RC_NORMALIZE
 221 +  }
 222 +  RC_FLUSH_VAR
 223 +  return result;
 224 +}
 225 +
 226 +int RangeDecoderBitDecode(CProb *prob, CRangeDecoder *rd)
 227 +{
 228 +  UInt32 bound = (rd->Range >> kNumBitModelTotalBits) * *prob;
 229 +  if (rd->Code < bound)
 230 +  {
 231 +    rd->Range = bound;
 232 +    *prob += (kBitModelTotal - *prob) >> kNumMoveBits;
 233 +    if (rd->Range < kTopValue)
 234 +    {
 235 +      rd->Code = (rd->Code << 8) | ReadByte;
 236 +      rd->Range <<= 8;
 237 +    }
 238 +    return 0;
 239 +  }
 240 +  else
 241 +  {
 242 +    rd->Range -= bound;
 243 +    rd->Code -= bound;
 244 +    *prob -= (*prob) >> kNumMoveBits;
 245 +    if (rd->Range < kTopValue)
 246 +    {
 247 +      rd->Code = (rd->Code << 8) | ReadByte;
 248 +      rd->Range <<= 8;
 249 +    }
 250 +    return 1;
 251 +  }
 252 +}
 253 +
 254 +#define RC_GET_BIT2(prob, mi, A0, A1) \
 255 +  UInt32 bound = (range >> kNumBitModelTotalBits) * *prob; \
 256 +  if (code < bound) \
 257 +    { A0; range = bound; *prob += (kBitModelTotal - *prob) >> kNumMoveBits; mi <<= 1; } \
 258 +  else \
 259 +    { A1; range -= bound; code -= bound; *prob -= (*prob) >> kNumMoveBits; mi = (mi + mi) + 1; } \
 260 +  RC_NORMALIZE
 261 +
 262 +#define RC_GET_BIT(prob, mi) RC_GET_BIT2(prob, mi, ; , ;)
 263 +
 264 +int RangeDecoderBitTreeDecode(CProb *probs, int numLevels, CRangeDecoder *rd)
 265 +{
 266 +  int mi = 1;
 267 +  int i;
 268 +  #ifdef _LZMA_LOC_OPT
 269 +  RC_INIT_VAR
 270 +  #endif
 271 +  for(i = numLevels; i > 0; i--)
 272 +  {
 273 +    #ifdef _LZMA_LOC_OPT
 274 +    CProb *prob = probs + mi;
 275 +    RC_GET_BIT(prob, mi)
 276 +    #else
 277 +    mi = (mi + mi) + RangeDecoderBitDecode(probs + mi, rd);
 278 +    #endif
 279 +  }
 280 +  #ifdef _LZMA_LOC_OPT
 281 +  RC_FLUSH_VAR
 282 +  #endif
 283 +  return mi - (1 << numLevels);
 284 +}
 285 +
 286 +int RangeDecoderReverseBitTreeDecode(CProb *probs, int numLevels, CRangeDecoder *rd)
 287 +{
 288 +  int mi = 1;
 289 +  int i;
 290 +  int symbol = 0;
 291 +  #ifdef _LZMA_LOC_OPT
 292 +  RC_INIT_VAR
 293 +  #endif
 294 +  for(i = 0; i < numLevels; i++)
 295 +  {
 296 +    #ifdef _LZMA_LOC_OPT
 297 +    CProb *prob = probs + mi;
 298 +    RC_GET_BIT2(prob, mi, ; , symbol |= (1 << i))
 299 +    #else
 300 +    int bit = RangeDecoderBitDecode(probs + mi, rd);
 301 +    mi = mi + mi + bit;
 302 +    symbol |= (bit << i);
 303 +    #endif
 304 +  }
 305 +  #ifdef _LZMA_LOC_OPT
 306 +  RC_FLUSH_VAR
 307 +  #endif
 308 +  return symbol;
 309 +}
 310 +
 311 +Byte LzmaLiteralDecode(CProb *probs, CRangeDecoder *rd)
 312 +{
 313 +  int symbol = 1;
 314 +  #ifdef _LZMA_LOC_OPT
 315 +  RC_INIT_VAR
 316 +  #endif
 317 +  do
 318 +  {
 319 +    #ifdef _LZMA_LOC_OPT
 320 +    CProb *prob = probs + symbol;
 321 +    RC_GET_BIT(prob, symbol)
 322 +    #else
 323 +    symbol = (symbol + symbol) | RangeDecoderBitDecode(probs + symbol, rd);
 324 +    #endif
 325 +  }
 326 +  while (symbol < 0x100);
 327 +  #ifdef _LZMA_LOC_OPT
 328 +  RC_FLUSH_VAR
 329 +  #endif
 330 +  return symbol;
 331 +}
 332 +
 333 +Byte LzmaLiteralDecodeMatch(CProb *probs, CRangeDecoder *rd, Byte matchByte)
 334 +{
 335 +  int symbol = 1;
 336 +  #ifdef _LZMA_LOC_OPT
 337 +  RC_INIT_VAR
 338 +  #endif
 339 +  do
 340 +  {
 341 +    int bit;
 342 +    int matchBit = (matchByte >> 7) & 1;
 343 +    matchByte <<= 1;
 344 +    #ifdef _LZMA_LOC_OPT
 345 +    {
 346 +      CProb *prob = probs + ((1 + matchBit) << 8) + symbol;
 347 +      RC_GET_BIT2(prob, symbol, bit = 0, bit = 1)
 348 +    }
 349 +    #else
 350 +    bit = RangeDecoderBitDecode(probs + ((1 + matchBit) << 8) + symbol, rd);
 351 +    symbol = (symbol << 1) | bit;
 352 +    #endif
 353 +    if (matchBit != bit)
 354 +    {
 355 +      while (symbol < 0x100)
 356 +      {
 357 +        #ifdef _LZMA_LOC_OPT
 358 +        CProb *prob = probs + symbol;
 359 +        RC_GET_BIT(prob, symbol)
 360 +        #else
 361 +        symbol = (symbol + symbol) | RangeDecoderBitDecode(probs + symbol, rd);
 362 +        #endif
 363 +      }
 364 +      break;
 365 +    }
 366 +  }
 367 +  while (symbol < 0x100);
 368 +  #ifdef _LZMA_LOC_OPT
 369 +  RC_FLUSH_VAR
 370 +  #endif
 371 +  return symbol;
 372 +}
 373 +
 374 +#define kNumPosBitsMax 4
 375 +#define kNumPosStatesMax (1 << kNumPosBitsMax)
 376 +
 377 +#define kLenNumLowBits 3
 378 +#define kLenNumLowSymbols (1 << kLenNumLowBits)
 379 +#define kLenNumMidBits 3
 380 +#define kLenNumMidSymbols (1 << kLenNumMidBits)
 381 +#define kLenNumHighBits 8
 382 +#define kLenNumHighSymbols (1 << kLenNumHighBits)
 383 +
 384 +#define LenChoice 0
 385 +#define LenChoice2 (LenChoice + 1)
 386 +#define LenLow (LenChoice2 + 1)
 387 +#define LenMid (LenLow + (kNumPosStatesMax << kLenNumLowBits))
 388 +#define LenHigh (LenMid + (kNumPosStatesMax << kLenNumMidBits))
 389 +#define kNumLenProbs (LenHigh + kLenNumHighSymbols)
 390 +
 391 +int LzmaLenDecode(CProb *p, CRangeDecoder *rd, int posState)
 392 +{
 393 +  if(RangeDecoderBitDecode(p + LenChoice, rd) == 0)
 394 +    return RangeDecoderBitTreeDecode(p + LenLow +
 395 +        (posState << kLenNumLowBits), kLenNumLowBits, rd);
 396 +  if(RangeDecoderBitDecode(p + LenChoice2, rd) == 0)
 397 +    return kLenNumLowSymbols + RangeDecoderBitTreeDecode(p + LenMid +
 398 +        (posState << kLenNumMidBits), kLenNumMidBits, rd);
 399 +  return kLenNumLowSymbols + kLenNumMidSymbols +
 400 +      RangeDecoderBitTreeDecode(p + LenHigh, kLenNumHighBits, rd);
 401 +}
 402 +
 403 +#define kNumStates 12
 404 +
 405 +#define kStartPosModelIndex 4
 406 +#define kEndPosModelIndex 14
 407 +#define kNumFullDistances (1 << (kEndPosModelIndex >> 1))
 408 +
 409 +#define kNumPosSlotBits 6
 410 +#define kNumLenToPosStates 4
 411 +
 412 +#define kNumAlignBits 4
 413 +#define kAlignTableSize (1 << kNumAlignBits)
 414 +
 415 +#define kMatchMinLen 2
 416 +
 417 +#define IsMatch 0
 418 +#define IsRep (IsMatch + (kNumStates << kNumPosBitsMax))
 419 +#define IsRepG0 (IsRep + kNumStates)
 420 +#define IsRepG1 (IsRepG0 + kNumStates)
 421 +#define IsRepG2 (IsRepG1 + kNumStates)
 422 +#define IsRep0Long (IsRepG2 + kNumStates)
 423 +#define PosSlot (IsRep0Long + (kNumStates << kNumPosBitsMax))
 424 +#define SpecPos (PosSlot + (kNumLenToPosStates << kNumPosSlotBits))
 425 +#define Align (SpecPos + kNumFullDistances - kEndPosModelIndex)
 426 +#define LenCoder (Align + kAlignTableSize)
 427 +#define RepLenCoder (LenCoder + kNumLenProbs)
 428 +#define Literal (RepLenCoder + kNumLenProbs)
 429 +
 430 +#if Literal != LZMA_BASE_SIZE
 431 +StopCompilingDueBUG
 432 +#endif
 433 +
 434 +#ifdef _LZMA_OUT_READ
 435 +
 436 +typedef struct _LzmaVarState
 437 +{
 438 +  CRangeDecoder RangeDecoder;
 439 +  Byte *Dictionary;
 440 +  UInt32 DictionarySize;
 441 +  UInt32 DictionaryPos;
 442 +  UInt32 GlobalPos;
 443 +  UInt32 Reps[4];
 444 +  int lc;
 445 +  int lp;
 446 +  int pb;
 447 +  int State;
 448 +  int PreviousIsMatch;
 449 +  int RemainLen;
 450 +} LzmaVarState;
 451 +
 452 +int LzmaDecoderInit(
 453 +    unsigned char *buffer, UInt32 bufferSize,
 454 +    int lc, int lp, int pb,
 455 +    unsigned char *dictionary, UInt32 dictionarySize,
 456 +    #ifdef _LZMA_IN_CB
 457 +    ILzmaInCallback *inCallback
 458 +    #else
 459 +    unsigned char *inStream, UInt32 inSize
 460 +    #endif
 461 +    )
 462 +{
 463 +  LzmaVarState *vs = (LzmaVarState *)buffer;
 464 +  CProb *p = (CProb *)(buffer + sizeof(LzmaVarState));
 465 +  UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + lp));
 466 +  UInt32 i;
 467 +  if (bufferSize < numProbs * sizeof(CProb) + sizeof(LzmaVarState))
 468 +    return LZMA_RESULT_NOT_ENOUGH_MEM;
 469 +  vs->Dictionary = dictionary;
 470 +  vs->DictionarySize = dictionarySize;
 471 +  vs->DictionaryPos = 0;
 472 +  vs->GlobalPos = 0;
 473 +  vs->Reps[0] = vs->Reps[1] = vs->Reps[2] = vs->Reps[3] = 1;
 474 +  vs->lc = lc;
 475 +  vs->lp = lp;
 476 +  vs->pb = pb;
 477 +  vs->State = 0;
 478 +  vs->PreviousIsMatch = 0;
 479 +  vs->RemainLen = 0;
 480 +  dictionary[dictionarySize - 1] = 0;
 481 +  for (i = 0; i < numProbs; i++)
 482 +    p[i] = kBitModelTotal >> 1;
 483 +  RangeDecoderInit(&vs->RangeDecoder,
 484 +      #ifdef _LZMA_IN_CB
 485 +      inCallback
 486 +      #else
 487 +      inStream, inSize
 488 +      #endif
 489 +  );
 490 +  return LZMA_RESULT_OK;
 491 +}
 492 +
 493 +int LzmaDecode(unsigned char *buffer,
 494 +    unsigned char *outStream, UInt32 outSize,
 495 +    UInt32 *outSizeProcessed)
 496 +{
 497 +  LzmaVarState *vs = (LzmaVarState *)buffer;
 498 +  CProb *p = (CProb *)(buffer + sizeof(LzmaVarState));
 499 +  CRangeDecoder rd = vs->RangeDecoder;
 500 +  int state = vs->State;
 501 +  int previousIsMatch = vs->PreviousIsMatch;
 502 +  Byte previousByte;
 503 +  UInt32 rep0 = vs->Reps[0], rep1 = vs->Reps[1], rep2 = vs->Reps[2], rep3 = vs->Reps[3];
 504 +  UInt32 nowPos = 0;
 505 +  UInt32 posStateMask = (1 << (vs->pb)) - 1;
 506 +  UInt32 literalPosMask = (1 << (vs->lp)) - 1;
 507 +  int lc = vs->lc;
 508 +  int len = vs->RemainLen;
 509 +  UInt32 globalPos = vs->GlobalPos;
 510 +
 511 +  Byte *dictionary = vs->Dictionary;
 512 +  UInt32 dictionarySize = vs->DictionarySize;
 513 +  UInt32 dictionaryPos = vs->DictionaryPos;
 514 +
 515 +  if (len == -1)
 516 +  {
 517 +    *outSizeProcessed = 0;
 518 +    return LZMA_RESULT_OK;
 519 +  }
 520 +
 521 +  while(len > 0 && nowPos < outSize)
 522 +  {
 523 +    UInt32 pos = dictionaryPos - rep0;
 524 +    if (pos >= dictionarySize)
 525 +      pos += dictionarySize;
 526 +    outStream[nowPos++] = dictionary[dictionaryPos] = dictionary[pos];
 527 +    if (++dictionaryPos == dictionarySize)
 528 +      dictionaryPos = 0;
 529 +    len--;
 530 +  }
 531 +  if (dictionaryPos == 0)
 532 +    previousByte = dictionary[dictionarySize - 1];
 533 +  else
 534 +    previousByte = dictionary[dictionaryPos - 1];
 535 +#else
 536 +
 537 +int LzmaDecode(
 538 +    Byte *buffer, UInt32 bufferSize,
 539 +    int lc, int lp, int pb,
 540 +    #ifdef _LZMA_IN_CB
 541 +    ILzmaInCallback *inCallback,
 542 +    #else
 543 +    unsigned char *inStream, UInt32 inSize,
 544 +    #endif
 545 +    unsigned char *outStream, UInt32 outSize,
 546 +    UInt32 *outSizeProcessed)
 547 +{
 548 +  UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + lp));
 549 +  CProb *p = (CProb *)buffer;
 550 +  CRangeDecoder rd;
 551 +  UInt32 i;
 552 +  int state = 0;
 553 +  int previousIsMatch = 0;
 554 +  Byte previousByte = 0;
 555 +  UInt32 rep0 = 1, rep1 = 1, rep2 = 1, rep3 = 1;
 556 +  UInt32 nowPos = 0;
 557 +  UInt32 posStateMask = (1 << pb) - 1;
 558 +  UInt32 literalPosMask = (1 << lp) - 1;
 559 +  int len = 0;
 560 +  if (bufferSize < numProbs * sizeof(CProb))
 561 +    return LZMA_RESULT_NOT_ENOUGH_MEM;
 562 +  for (i = 0; i < numProbs; i++)
 563 +    p[i] = kBitModelTotal >> 1;
 564 +  RangeDecoderInit(&rd,
 565 +      #ifdef _LZMA_IN_CB
 566 +      inCallback
 567 +      #else
 568 +      inStream, inSize
 569 +      #endif
 570 +      );
 571 +#endif
 572 +
 573 +  *outSizeProcessed = 0;
 574 +  while(nowPos < outSize)
 575 +  {
 576 +    int posState = (int)(
 577 +        (nowPos
 578 +        #ifdef _LZMA_OUT_READ
 579 +        + globalPos
 580 +        #endif
 581 +        )
 582 +        & posStateMask);
 583 +    #ifdef _LZMA_IN_CB
 584 +    if (rd.Result != LZMA_RESULT_OK)
 585 +      return rd.Result;
 586 +    #endif
 587 +    if (rd.ExtraBytes != 0)
 588 +      return LZMA_RESULT_DATA_ERROR;
 589 +    if (RangeDecoderBitDecode(p + IsMatch + (state << kNumPosBitsMax) + posState, &rd) == 0)
 590 +    {
 591 +      CProb *probs = p + Literal + (LZMA_LIT_SIZE *
 592 +        (((
 593 +        (nowPos
 594 +        #ifdef _LZMA_OUT_READ
 595 +        + globalPos
 596 +        #endif
 597 +        )
 598 +        & literalPosMask) << lc) + (previousByte >> (8 - lc))));
 599 +
 600 +      if (state < 4) state = 0;
 601 +      else if (state < 10) state -= 3;
 602 +      else state -= 6;
 603 +      if (previousIsMatch)
 604 +      {
 605 +        Byte matchByte;
 606 +        #ifdef _LZMA_OUT_READ
 607 +        UInt32 pos = dictionaryPos - rep0;
 608 +        if (pos >= dictionarySize)
 609 +          pos += dictionarySize;
 610 +        matchByte = dictionary[pos];
 611 +        #else
 612 +        matchByte = outStream[nowPos - rep0];
 613 +        #endif
 614 +        previousByte = LzmaLiteralDecodeMatch(probs, &rd, matchByte);
 615 +        previousIsMatch = 0;
 616 +      }
 617 +      else
 618 +        previousByte = LzmaLiteralDecode(probs, &rd);
 619 +      outStream[nowPos++] = previousByte;
 620 +      #ifdef _LZMA_OUT_READ
 621 +      dictionary[dictionaryPos] = previousByte;
 622 +      if (++dictionaryPos == dictionarySize)
 623 +        dictionaryPos = 0;
 624 +      #endif
 625 +    }
 626 +    else
 627 +    {
 628 +      previousIsMatch = 1;
 629 +      if (RangeDecoderBitDecode(p + IsRep + state, &rd) == 1)
 630 +      {
 631 +        if (RangeDecoderBitDecode(p + IsRepG0 + state, &rd) == 0)
 632 +        {
 633 +          if (RangeDecoderBitDecode(p + IsRep0Long + (state << kNumPosBitsMax) + posState, &rd) == 0)
 634 +          {
 635 +            #ifdef _LZMA_OUT_READ
 636 +            UInt32 pos;
 637 +            #endif
 638 +            if (
 639 +               (nowPos
 640 +                #ifdef _LZMA_OUT_READ
 641 +                + globalPos
 642 +                #endif
 643 +               )
 644 +               == 0)
 645 +              return LZMA_RESULT_DATA_ERROR;
 646 +            state = state < 7 ? 9 : 11;
 647 +            #ifdef _LZMA_OUT_READ
 648 +            pos = dictionaryPos - rep0;
 649 +            if (pos >= dictionarySize)
 650 +              pos += dictionarySize;
 651 +            previousByte = dictionary[pos];
 652 +            dictionary[dictionaryPos] = previousByte;
 653 +            if (++dictionaryPos == dictionarySize)
 654 +              dictionaryPos = 0;
 655 +            #else
 656 +            previousByte = outStream[nowPos - rep0];
 657 +            #endif
 658 +            outStream[nowPos++] = previousByte;
 659 +            continue;
 660 +          }
 661 +        }
 662 +        else
 663 +        {
 664 +          UInt32 distance;
 665 +          if(RangeDecoderBitDecode(p + IsRepG1 + state, &rd) == 0)
 666 +            distance = rep1;
 667 +          else
 668 +          {
 669 +            if(RangeDecoderBitDecode(p + IsRepG2 + state, &rd) == 0)
 670 +              distance = rep2;
 671 +            else
 672 +            {
 673 +              distance = rep3;
 674 +              rep3 = rep2;
 675 +            }
 676 +            rep2 = rep1;
 677 +          }
 678 +          rep1 = rep0;
 679 +          rep0 = distance;
 680 +        }
 681 +        len = LzmaLenDecode(p + RepLenCoder, &rd, posState);
 682 +        state = state < 7 ? 8 : 11;
 683 +      }
 684 +      else
 685 +      {
 686 +        int posSlot;
 687 +        rep3 = rep2;
 688 +        rep2 = rep1;
 689 +        rep1 = rep0;
 690 +        state = state < 7 ? 7 : 10;
 691 +        len = LzmaLenDecode(p + LenCoder, &rd, posState);
 692 +        posSlot = RangeDecoderBitTreeDecode(p + PosSlot +
 693 +            ((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) <<
 694 +            kNumPosSlotBits), kNumPosSlotBits, &rd);
 695 +        if (posSlot >= kStartPosModelIndex)
 696 +        {
 697 +          int numDirectBits = ((posSlot >> 1) - 1);
 698 +          rep0 = ((2 | ((UInt32)posSlot & 1)) << numDirectBits);
 699 +          if (posSlot < kEndPosModelIndex)
 700 +          {
 701 +            rep0 += RangeDecoderReverseBitTreeDecode(
 702 +                p + SpecPos + rep0 - posSlot - 1, numDirectBits, &rd);
 703 +          }
 704 +          else
 705 +          {
 706 +            rep0 += RangeDecoderDecodeDirectBits(&rd,
 707 +                numDirectBits - kNumAlignBits) << kNumAlignBits;
 708 +            rep0 += RangeDecoderReverseBitTreeDecode(p + Align, kNumAlignBits, &rd);
 709 +          }
 710 +        }
 711 +        else
 712 +          rep0 = posSlot;
 713 +        rep0++;
 714 +      }
 715 +      if (rep0 == (UInt32)(0))
 716 +      {
 717 +        /* it's for stream version */
 718 +        len = -1;
 719 +        break;
 720 +      }
 721 +      if (rep0 > nowPos
 722 +        #ifdef _LZMA_OUT_READ
 723 +        + globalPos
 724 +        #endif
 725 +        )
 726 +      {
 727 +        return LZMA_RESULT_DATA_ERROR;
 728 +      }
 729 +      len += kMatchMinLen;
 730 +      do
 731 +      {
 732 +        #ifdef _LZMA_OUT_READ
 733 +        UInt32 pos = dictionaryPos - rep0;
 734 +        if (pos >= dictionarySize)
 735 +          pos += dictionarySize;
 736 +        previousByte = dictionary[pos];
 737 +        dictionary[dictionaryPos] = previousByte;
 738 +        if (++dictionaryPos == dictionarySize)
 739 +          dictionaryPos = 0;
 740 +        #else
 741 +        previousByte = outStream[nowPos - rep0];
 742 +        #endif
 743 +        outStream[nowPos++] = previousByte;
 744 +        len--;
 745 +      }
 746 +      while(len > 0 && nowPos < outSize);
 747 +    }
 748 +  }
 749 +
 750 +  #ifdef _LZMA_OUT_READ
 751 +  vs->RangeDecoder = rd;
 752 +  vs->DictionaryPos = dictionaryPos;
 753 +  vs->GlobalPos = globalPos + nowPos;
 754 +  vs->Reps[0] = rep0;
 755 +  vs->Reps[1] = rep1;
 756 +  vs->Reps[2] = rep2;
 757 +  vs->Reps[3] = rep3;
 758 +  vs->State = state;
 759 +  vs->PreviousIsMatch = previousIsMatch;
 760 +  vs->RemainLen = len;
 761 +  #endif
 762 +
 763 +  *outSizeProcessed = nowPos;
 764 +  return LZMA_RESULT_OK;
 765 +}
 766 --- /dev/null
 767 +++ b/fs/squashfs/LzmaDecode.h
 768 @@ -0,0 +1,100 @@
 769 +/*
 770 +  LzmaDecode.h
 771 +  LZMA Decoder interface
 772 +
 773 +  LZMA SDK 4.05 Copyright (c) 1999-2004 Igor Pavlov (2004-08-25)
 774 +  http://www.7-zip.org/
 775 +
 776 +  LZMA SDK is licensed under two licenses:
 777 +  1) GNU Lesser General Public License (GNU LGPL)
 778 +  2) Common Public License (CPL)
 779 +  It means that you can select one of these two licenses and
 780 +  follow rules of that license.
 781 +
 782 +  SPECIAL EXCEPTION:
 783 +  Igor Pavlov, as the author of this code, expressly permits you to
 784 +  statically or dynamically link your code (or bind by name) to the
 785 +  interfaces of this file without subjecting your linked code to the
 786 +  terms of the CPL or GNU LGPL. Any modifications or additions
 787 +  to this file, however, are subject to the LGPL or CPL terms.
 788 +*/
 789 +
 790 +#ifndef __LZMADECODE_H
 791 +#define __LZMADECODE_H
 792 +
 793 +/* #define _LZMA_IN_CB */
 794 +/* Use callback for input data */
 795 +
 796 +/* #define _LZMA_OUT_READ */
 797 +/* Use read function for output data */
 798 +
 799 +/* #define _LZMA_PROB32 */
 800 +/* It can increase speed on some 32-bit CPUs,
 801 +   but memory usage will be doubled in that case */
 802 +
 803 +/* #define _LZMA_LOC_OPT */
 804 +/* Enable local speed optimizations inside code */
 805 +
 806 +#ifndef UInt32
 807 +#ifdef _LZMA_UINT32_IS_ULONG
 808 +#define UInt32 unsigned long
 809 +#else
 810 +#define UInt32 unsigned int
 811 +#endif
 812 +#endif
 813 +
 814 +#ifdef _LZMA_PROB32
 815 +#define CProb UInt32
 816 +#else
 817 +#define CProb unsigned short
 818 +#endif
 819 +
 820 +#define LZMA_RESULT_OK 0
 821 +#define LZMA_RESULT_DATA_ERROR 1
 822 +#define LZMA_RESULT_NOT_ENOUGH_MEM 2
 823 +
 824 +#ifdef _LZMA_IN_CB
 825 +typedef struct _ILzmaInCallback
 826 +{
 827 +  int (*Read)(void *object, unsigned char **buffer, UInt32 *bufferSize);
 828 +} ILzmaInCallback;
 829 +#endif
 830 +
 831 +#define LZMA_BASE_SIZE 1846
 832 +#define LZMA_LIT_SIZE 768
 833 +
 834 +/*
 835 +bufferSize = (LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp)))* sizeof(CProb)
 836 +bufferSize += 100 in case of _LZMA_OUT_READ
 837 +by default CProb is unsigned short,
 838 +but if specify _LZMA_PROB_32, CProb will be UInt32(unsigned int)
 839 +*/
 840 +
 841 +#ifdef _LZMA_OUT_READ
 842 +int LzmaDecoderInit(
 843 +    unsigned char *buffer, UInt32 bufferSize,
 844 +    int lc, int lp, int pb,
 845 +    unsigned char *dictionary, UInt32 dictionarySize,
 846 +  #ifdef _LZMA_IN_CB
 847 +    ILzmaInCallback *inCallback
 848 +  #else
 849 +    unsigned char *inStream, UInt32 inSize
 850 +  #endif
 851 +);
 852 +#endif
 853 +
 854 +int LzmaDecode(
 855 +    unsigned char *buffer,
 856 +  #ifndef _LZMA_OUT_READ
 857 +    UInt32 bufferSize,
 858 +    int lc, int lp, int pb,
 859 +  #ifdef _LZMA_IN_CB
 860 +    ILzmaInCallback *inCallback,
 861 +  #else
 862 +    unsigned char *inStream, UInt32 inSize,
 863 +  #endif
 864 +  #endif
 865 +    unsigned char *outStream, UInt32 outSize,
 866 +    UInt32 *outSizeProcessed);
 867 +
 868 +#endif
 869 --- a/fs/squashfs/Makefile
 870 +++ b/fs/squashfs/Makefile
 871 @@ -4,7 +4,7 @@
 872
 873  O_TARGET := squashfs.o
 874
 875 -obj-y  := inode.o squashfs2_0.o
 876 +obj-y  := inode.o squashfs2_0.o LzmaDecode.o
 877
 878  obj-m := $(O_TARGET)
 879