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

   1 Index: linux-2.4.35.4/fs/squashfs/inode.c
   2 ===================================================================
   3 --- linux-2.4.35.4.orig/fs/squashfs/inode.c     2007-12-15 05:19:48.647193283 +0100
   4 +++ linux-2.4.35.4/fs/squashfs/inode.c  2007-12-15 05:19:49.015214255 +0100
   5 @@ -4,6 +4,9 @@
   6   * Copyright (c) 2002, 2003, 2004, 2005, 2006
   7   * Phillip Lougher <phillip@lougher.org.uk>
   8   *
   9 + * LZMA decompressor support added by Oleg I. Vdovikin
  10 + * Copyright (c) 2005 Oleg I.Vdovikin <oleg@cs.msu.su>
  11 + *
  12   * This program is free software; you can redistribute it and/or
  13   * modify it under the terms of the GNU General Public License
  14   * as published by the Free Software Foundation; either version 2,
  15 @@ -21,6 +24,7 @@
  16   * inode.c
  17   */
  18
  19 +#define SQUASHFS_LZMA
  20  #include <linux/types.h>
  21  #include <linux/squashfs_fs.h>
  22  #include <linux/module.h>
  23 @@ -40,6 +44,20 @@
  24
  25  #include "squashfs.h"
  26
  27 +#ifdef SQUASHFS_LZMA
  28 +#include "LzmaDecode.h"
  29 +
  30 +/* default LZMA settings, should be in sync with mksquashfs */
  31 +#define LZMA_LC 3
  32 +#define LZMA_LP 0
  33 +#define LZMA_PB 2
  34 +
  35 +#define LZMA_WORKSPACE_SIZE ((LZMA_BASE_SIZE + \
  36 +      (LZMA_LIT_SIZE << (LZMA_LC + LZMA_LP))) * sizeof(CProb))
  37 +
  38 +#endif
  39 +
  40 +
  41  static struct super_block *squashfs_read_super(struct super_block *, void *, int);
  42  static void squashfs_put_super(struct super_block *);
  43  static int squashfs_statfs(struct super_block *, struct statfs *);
  44 @@ -53,7 +71,11 @@
  45                                 int readahead_blks, char *block_list,
  46                                 unsigned short **block_p, unsigned int *bsize);
  47
  48 +#ifdef SQUASHFS_LZMA
  49 +static unsigned char lzma_workspace[LZMA_WORKSPACE_SIZE];
  50 +#else
  51  static z_stream stream;
  52 +#endif
  53
  54  static DECLARE_FSTYPE_DEV(squashfs_fs_type, "squashfs", squashfs_read_super);
  55
  56 @@ -229,6 +251,15 @@
  57         if (compressed) {
  58                 int zlib_err;
  59
  60 +#ifdef SQUASHFS_LZMA
  61 +               if ((zlib_err = LzmaDecode(lzma_workspace,
  62 +                       LZMA_WORKSPACE_SIZE, LZMA_LC, LZMA_LP, LZMA_PB,
  63 +                       c_buffer, c_byte, buffer, msblk->read_size, &bytes)) != LZMA_RESULT_OK)
  64 +               {
  65 +                       ERROR("lzma returned unexpected result 0x%x\n", zlib_err);
  66 +                       bytes = 0;
  67 +               }
  68 +#else
  69                 stream.next_in = c_buffer;
  70                 stream.avail_in = c_byte;
  71                 stream.next_out = buffer;
  72 @@ -243,6 +274,7 @@
  73                         bytes = 0;
  74                 } else
  75                         bytes = stream.total_out;
  76 +#endif
  77
  78                 up(&msblk->read_data_mutex);
  79         }
  80 @@ -2004,17 +2036,21 @@
  81         printk(KERN_INFO "squashfs: version 3.0 (2006/03/15) "
  82                 "Phillip Lougher\n");
  83
  84 +#ifndef SQUASHFS_LZMA
  85         if (!(stream.workspace = vmalloc(zlib_inflate_workspacesize()))) {
  86                 ERROR("Failed to allocate zlib workspace\n");
  87                 return -ENOMEM;
  88         }
  89 +#endif
  90         return register_filesystem(&squashfs_fs_type);
  91  }
  92
  93
  94  static void __exit exit_squashfs_fs(void)
  95  {
  96 +#ifndef SQUASHFS_LZMA
  97         vfree(stream.workspace);
  98 +#endif
  99         unregister_filesystem(&squashfs_fs_type);
 100  }
 101
 102 Index: linux-2.4.35.4/fs/squashfs/LzmaDecode.c
 103 ===================================================================
 104 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
 105 +++ linux-2.4.35.4/fs/squashfs/LzmaDecode.c     2007-12-15 05:19:49.019214484 +0100
 106 @@ -0,0 +1,663 @@
 107 +/*
 108 +  LzmaDecode.c
 109 +  LZMA Decoder
 110 +
 111 +  LZMA SDK 4.05 Copyright (c) 1999-2004 Igor Pavlov (2004-08-25)
 112 +  http://www.7-zip.org/
 113 +
 114 +  LZMA SDK is licensed under two licenses:
 115 +  1) GNU Lesser General Public License (GNU LGPL)
 116 +  2) Common Public License (CPL)
 117 +  It means that you can select one of these two licenses and
 118 +  follow rules of that license.
 119 +
 120 +  SPECIAL EXCEPTION:
 121 +  Igor Pavlov, as the author of this code, expressly permits you to
 122 +  statically or dynamically link your code (or bind by name) to the
 123 +  interfaces of this file without subjecting your linked code to the
 124 +  terms of the CPL or GNU LGPL. Any modifications or additions
 125 +  to this file, however, are subject to the LGPL or CPL terms.
 126 +*/
 127 +
 128 +#include "LzmaDecode.h"
 129 +
 130 +#ifndef Byte
 131 +#define Byte unsigned char
 132 +#endif
 133 +
 134 +#define kNumTopBits 24
 135 +#define kTopValue ((UInt32)1 << kNumTopBits)
 136 +
 137 +#define kNumBitModelTotalBits 11
 138 +#define kBitModelTotal (1 << kNumBitModelTotalBits)
 139 +#define kNumMoveBits 5
 140 +
 141 +typedef struct _CRangeDecoder
 142 +{
 143 +  Byte *Buffer;
 144 +  Byte *BufferLim;
 145 +  UInt32 Range;
 146 +  UInt32 Code;
 147 +  #ifdef _LZMA_IN_CB
 148 +  ILzmaInCallback *InCallback;
 149 +  int Result;
 150 +  #endif
 151 +  int ExtraBytes;
 152 +} CRangeDecoder;
 153 +
 154 +Byte RangeDecoderReadByte(CRangeDecoder *rd)
 155 +{
 156 +  if (rd->Buffer == rd->BufferLim)
 157 +  {
 158 +    #ifdef _LZMA_IN_CB
 159 +    UInt32 size;
 160 +    rd->Result = rd->InCallback->Read(rd->InCallback, &rd->Buffer, &size);
 161 +    rd->BufferLim = rd->Buffer + size;
 162 +    if (size == 0)
 163 +    #endif
 164 +    {
 165 +      rd->ExtraBytes = 1;
 166 +      return 0xFF;
 167 +    }
 168 +  }
 169 +  return (*rd->Buffer++);
 170 +}
 171 +
 172 +/* #define ReadByte (*rd->Buffer++) */
 173 +#define ReadByte (RangeDecoderReadByte(rd))
 174 +
 175 +void RangeDecoderInit(CRangeDecoder *rd,
 176 +  #ifdef _LZMA_IN_CB
 177 +    ILzmaInCallback *inCallback
 178 +  #else
 179 +    Byte *stream, UInt32 bufferSize
 180 +  #endif
 181 +    )
 182 +{
 183 +  int i;
 184 +  #ifdef _LZMA_IN_CB
 185 +  rd->InCallback = inCallback;
 186 +  rd->Buffer = rd->BufferLim = 0;
 187 +  #else
 188 +  rd->Buffer = stream;
 189 +  rd->BufferLim = stream + bufferSize;
 190 +  #endif
 191 +  rd->ExtraBytes = 0;
 192 +  rd->Code = 0;
 193 +  rd->Range = (0xFFFFFFFF);
 194 +  for(i = 0; i < 5; i++)
 195 +    rd->Code = (rd->Code << 8) | ReadByte;
 196 +}
 197 +
 198 +#define RC_INIT_VAR UInt32 range = rd->Range; UInt32 code = rd->Code;
 199 +#define RC_FLUSH_VAR rd->Range = range; rd->Code = code;
 200 +#define RC_NORMALIZE if (range < kTopValue) { range <<= 8; code = (code << 8) | ReadByte; }
 201 +
 202 +UInt32 RangeDecoderDecodeDirectBits(CRangeDecoder *rd, int numTotalBits)
 203 +{
 204 +  RC_INIT_VAR
 205 +  UInt32 result = 0;
 206 +  int i;
 207 +  for (i = numTotalBits; i > 0; i--)
 208 +  {
 209 +    /* UInt32 t; */
 210 +    range >>= 1;
 211 +
 212 +    result <<= 1;
 213 +    if (code >= range)
 214 +    {
 215 +      code -= range;
 216 +      result |= 1;
 217 +    }
 218 +    /*
 219 +    t = (code - range) >> 31;
 220 +    t &= 1;
 221 +    code -= range & (t - 1);
 222 +    result = (result + result) | (1 - t);
 223 +    */
 224 +    RC_NORMALIZE
 225 +  }
 226 +  RC_FLUSH_VAR
 227 +  return result;
 228 +}
 229 +
 230 +int RangeDecoderBitDecode(CProb *prob, CRangeDecoder *rd)
 231 +{
 232 +  UInt32 bound = (rd->Range >> kNumBitModelTotalBits) * *prob;
 233 +  if (rd->Code < bound)
 234 +  {
 235 +    rd->Range = bound;
 236 +    *prob += (kBitModelTotal - *prob) >> kNumMoveBits;
 237 +    if (rd->Range < kTopValue)
 238 +    {
 239 +      rd->Code = (rd->Code << 8) | ReadByte;
 240 +      rd->Range <<= 8;
 241 +    }
 242 +    return 0;
 243 +  }
 244 +  else
 245 +  {
 246 +    rd->Range -= bound;
 247 +    rd->Code -= bound;
 248 +    *prob -= (*prob) >> kNumMoveBits;
 249 +    if (rd->Range < kTopValue)
 250 +    {
 251 +      rd->Code = (rd->Code << 8) | ReadByte;
 252 +      rd->Range <<= 8;
 253 +    }
 254 +    return 1;
 255 +  }
 256 +}
 257 +
 258 +#define RC_GET_BIT2(prob, mi, A0, A1) \
 259 +  UInt32 bound = (range >> kNumBitModelTotalBits) * *prob; \
 260 +  if (code < bound) \
 261 +    { A0; range = bound; *prob += (kBitModelTotal - *prob) >> kNumMoveBits; mi <<= 1; } \
 262 +  else \
 263 +    { A1; range -= bound; code -= bound; *prob -= (*prob) >> kNumMoveBits; mi = (mi + mi) + 1; } \
 264 +  RC_NORMALIZE
 265 +
 266 +#define RC_GET_BIT(prob, mi) RC_GET_BIT2(prob, mi, ; , ;)
 267 +
 268 +int RangeDecoderBitTreeDecode(CProb *probs, int numLevels, CRangeDecoder *rd)
 269 +{
 270 +  int mi = 1;
 271 +  int i;
 272 +  #ifdef _LZMA_LOC_OPT
 273 +  RC_INIT_VAR
 274 +  #endif
 275 +  for(i = numLevels; i > 0; i--)
 276 +  {
 277 +    #ifdef _LZMA_LOC_OPT
 278 +    CProb *prob = probs + mi;
 279 +    RC_GET_BIT(prob, mi)
 280 +    #else
 281 +    mi = (mi + mi) + RangeDecoderBitDecode(probs + mi, rd);
 282 +    #endif
 283 +  }
 284 +  #ifdef _LZMA_LOC_OPT
 285 +  RC_FLUSH_VAR
 286 +  #endif
 287 +  return mi - (1 << numLevels);
 288 +}
 289 +
 290 +int RangeDecoderReverseBitTreeDecode(CProb *probs, int numLevels, CRangeDecoder *rd)
 291 +{
 292 +  int mi = 1;
 293 +  int i;
 294 +  int symbol = 0;
 295 +  #ifdef _LZMA_LOC_OPT
 296 +  RC_INIT_VAR
 297 +  #endif
 298 +  for(i = 0; i < numLevels; i++)
 299 +  {
 300 +    #ifdef _LZMA_LOC_OPT
 301 +    CProb *prob = probs + mi;
 302 +    RC_GET_BIT2(prob, mi, ; , symbol |= (1 << i))
 303 +    #else
 304 +    int bit = RangeDecoderBitDecode(probs + mi, rd);
 305 +    mi = mi + mi + bit;
 306 +    symbol |= (bit << i);
 307 +    #endif
 308 +  }
 309 +  #ifdef _LZMA_LOC_OPT
 310 +  RC_FLUSH_VAR
 311 +  #endif
 312 +  return symbol;
 313 +}
 314 +
 315 +Byte LzmaLiteralDecode(CProb *probs, CRangeDecoder *rd)
 316 +{
 317 +  int symbol = 1;
 318 +  #ifdef _LZMA_LOC_OPT
 319 +  RC_INIT_VAR
 320 +  #endif
 321 +  do
 322 +  {
 323 +    #ifdef _LZMA_LOC_OPT
 324 +    CProb *prob = probs + symbol;
 325 +    RC_GET_BIT(prob, symbol)
 326 +    #else
 327 +    symbol = (symbol + symbol) | RangeDecoderBitDecode(probs + symbol, rd);
 328 +    #endif
 329 +  }
 330 +  while (symbol < 0x100);
 331 +  #ifdef _LZMA_LOC_OPT
 332 +  RC_FLUSH_VAR
 333 +  #endif
 334 +  return symbol;
 335 +}
 336 +
 337 +Byte LzmaLiteralDecodeMatch(CProb *probs, CRangeDecoder *rd, Byte matchByte)
 338 +{
 339 +  int symbol = 1;
 340 +  #ifdef _LZMA_LOC_OPT
 341 +  RC_INIT_VAR
 342 +  #endif
 343 +  do
 344 +  {
 345 +    int bit;
 346 +    int matchBit = (matchByte >> 7) & 1;
 347 +    matchByte <<= 1;
 348 +    #ifdef _LZMA_LOC_OPT
 349 +    {
 350 +      CProb *prob = probs + ((1 + matchBit) << 8) + symbol;
 351 +      RC_GET_BIT2(prob, symbol, bit = 0, bit = 1)
 352 +    }
 353 +    #else
 354 +    bit = RangeDecoderBitDecode(probs + ((1 + matchBit) << 8) + symbol, rd);
 355 +    symbol = (symbol << 1) | bit;
 356 +    #endif
 357 +    if (matchBit != bit)
 358 +    {
 359 +      while (symbol < 0x100)
 360 +      {
 361 +        #ifdef _LZMA_LOC_OPT
 362 +        CProb *prob = probs + symbol;
 363 +        RC_GET_BIT(prob, symbol)
 364 +        #else
 365 +        symbol = (symbol + symbol) | RangeDecoderBitDecode(probs + symbol, rd);
 366 +        #endif
 367 +      }
 368 +      break;
 369 +    }
 370 +  }
 371 +  while (symbol < 0x100);
 372 +  #ifdef _LZMA_LOC_OPT
 373 +  RC_FLUSH_VAR
 374 +  #endif
 375 +  return symbol;
 376 +}
 377 +
 378 +#define kNumPosBitsMax 4
 379 +#define kNumPosStatesMax (1 << kNumPosBitsMax)
 380 +
 381 +#define kLenNumLowBits 3
 382 +#define kLenNumLowSymbols (1 << kLenNumLowBits)
 383 +#define kLenNumMidBits 3
 384 +#define kLenNumMidSymbols (1 << kLenNumMidBits)
 385 +#define kLenNumHighBits 8
 386 +#define kLenNumHighSymbols (1 << kLenNumHighBits)
 387 +
 388 +#define LenChoice 0
 389 +#define LenChoice2 (LenChoice + 1)
 390 +#define LenLow (LenChoice2 + 1)
 391 +#define LenMid (LenLow + (kNumPosStatesMax << kLenNumLowBits))
 392 +#define LenHigh (LenMid + (kNumPosStatesMax << kLenNumMidBits))
 393 +#define kNumLenProbs (LenHigh + kLenNumHighSymbols)
 394 +
 395 +int LzmaLenDecode(CProb *p, CRangeDecoder *rd, int posState)
 396 +{
 397 +  if(RangeDecoderBitDecode(p + LenChoice, rd) == 0)
 398 +    return RangeDecoderBitTreeDecode(p + LenLow +
 399 +        (posState << kLenNumLowBits), kLenNumLowBits, rd);
 400 +  if(RangeDecoderBitDecode(p + LenChoice2, rd) == 0)
 401 +    return kLenNumLowSymbols + RangeDecoderBitTreeDecode(p + LenMid +
 402 +        (posState << kLenNumMidBits), kLenNumMidBits, rd);
 403 +  return kLenNumLowSymbols + kLenNumMidSymbols +
 404 +      RangeDecoderBitTreeDecode(p + LenHigh, kLenNumHighBits, rd);
 405 +}
 406 +
 407 +#define kNumStates 12
 408 +
 409 +#define kStartPosModelIndex 4
 410 +#define kEndPosModelIndex 14
 411 +#define kNumFullDistances (1 << (kEndPosModelIndex >> 1))
 412 +
 413 +#define kNumPosSlotBits 6
 414 +#define kNumLenToPosStates 4
 415 +
 416 +#define kNumAlignBits 4
 417 +#define kAlignTableSize (1 << kNumAlignBits)
 418 +
 419 +#define kMatchMinLen 2
 420 +
 421 +#define IsMatch 0
 422 +#define IsRep (IsMatch + (kNumStates << kNumPosBitsMax))
 423 +#define IsRepG0 (IsRep + kNumStates)
 424 +#define IsRepG1 (IsRepG0 + kNumStates)
 425 +#define IsRepG2 (IsRepG1 + kNumStates)
 426 +#define IsRep0Long (IsRepG2 + kNumStates)
 427 +#define PosSlot (IsRep0Long + (kNumStates << kNumPosBitsMax))
 428 +#define SpecPos (PosSlot + (kNumLenToPosStates << kNumPosSlotBits))
 429 +#define Align (SpecPos + kNumFullDistances - kEndPosModelIndex)
 430 +#define LenCoder (Align + kAlignTableSize)
 431 +#define RepLenCoder (LenCoder + kNumLenProbs)
 432 +#define Literal (RepLenCoder + kNumLenProbs)
 433 +
 434 +#if Literal != LZMA_BASE_SIZE
 435 +StopCompilingDueBUG
 436 +#endif
 437 +
 438 +#ifdef _LZMA_OUT_READ
 439 +
 440 +typedef struct _LzmaVarState
 441 +{
 442 +  CRangeDecoder RangeDecoder;
 443 +  Byte *Dictionary;
 444 +  UInt32 DictionarySize;
 445 +  UInt32 DictionaryPos;
 446 +  UInt32 GlobalPos;
 447 +  UInt32 Reps[4];
 448 +  int lc;
 449 +  int lp;
 450 +  int pb;
 451 +  int State;
 452 +  int PreviousIsMatch;
 453 +  int RemainLen;
 454 +} LzmaVarState;
 455 +
 456 +int LzmaDecoderInit(
 457 +    unsigned char *buffer, UInt32 bufferSize,
 458 +    int lc, int lp, int pb,
 459 +    unsigned char *dictionary, UInt32 dictionarySize,
 460 +    #ifdef _LZMA_IN_CB
 461 +    ILzmaInCallback *inCallback
 462 +    #else
 463 +    unsigned char *inStream, UInt32 inSize
 464 +    #endif
 465 +    )
 466 +{
 467 +  LzmaVarState *vs = (LzmaVarState *)buffer;
 468 +  CProb *p = (CProb *)(buffer + sizeof(LzmaVarState));
 469 +  UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + lp));
 470 +  UInt32 i;
 471 +  if (bufferSize < numProbs * sizeof(CProb) + sizeof(LzmaVarState))
 472 +    return LZMA_RESULT_NOT_ENOUGH_MEM;
 473 +  vs->Dictionary = dictionary;
 474 +  vs->DictionarySize = dictionarySize;
 475 +  vs->DictionaryPos = 0;
 476 +  vs->GlobalPos = 0;
 477 +  vs->Reps[0] = vs->Reps[1] = vs->Reps[2] = vs->Reps[3] = 1;
 478 +  vs->lc = lc;
 479 +  vs->lp = lp;
 480 +  vs->pb = pb;
 481 +  vs->State = 0;
 482 +  vs->PreviousIsMatch = 0;
 483 +  vs->RemainLen = 0;
 484 +  dictionary[dictionarySize - 1] = 0;
 485 +  for (i = 0; i < numProbs; i++)
 486 +    p[i] = kBitModelTotal >> 1;
 487 +  RangeDecoderInit(&vs->RangeDecoder,
 488 +      #ifdef _LZMA_IN_CB
 489 +      inCallback
 490 +      #else
 491 +      inStream, inSize
 492 +      #endif
 493 +  );
 494 +  return LZMA_RESULT_OK;
 495 +}
 496 +
 497 +int LzmaDecode(unsigned char *buffer,
 498 +    unsigned char *outStream, UInt32 outSize,
 499 +    UInt32 *outSizeProcessed)
 500 +{
 501 +  LzmaVarState *vs = (LzmaVarState *)buffer;
 502 +  CProb *p = (CProb *)(buffer + sizeof(LzmaVarState));
 503 +  CRangeDecoder rd = vs->RangeDecoder;
 504 +  int state = vs->State;
 505 +  int previousIsMatch = vs->PreviousIsMatch;
 506 +  Byte previousByte;
 507 +  UInt32 rep0 = vs->Reps[0], rep1 = vs->Reps[1], rep2 = vs->Reps[2], rep3 = vs->Reps[3];
 508 +  UInt32 nowPos = 0;
 509 +  UInt32 posStateMask = (1 << (vs->pb)) - 1;
 510 +  UInt32 literalPosMask = (1 << (vs->lp)) - 1;
 511 +  int lc = vs->lc;
 512 +  int len = vs->RemainLen;
 513 +  UInt32 globalPos = vs->GlobalPos;
 514 +
 515 +  Byte *dictionary = vs->Dictionary;
 516 +  UInt32 dictionarySize = vs->DictionarySize;
 517 +  UInt32 dictionaryPos = vs->DictionaryPos;
 518 +
 519 +  if (len == -1)
 520 +  {
 521 +    *outSizeProcessed = 0;
 522 +    return LZMA_RESULT_OK;
 523 +  }
 524 +
 525 +  while(len > 0 && nowPos < outSize)
 526 +  {
 527 +    UInt32 pos = dictionaryPos - rep0;
 528 +    if (pos >= dictionarySize)
 529 +      pos += dictionarySize;
 530 +    outStream[nowPos++] = dictionary[dictionaryPos] = dictionary[pos];
 531 +    if (++dictionaryPos == dictionarySize)
 532 +      dictionaryPos = 0;
 533 +    len--;
 534 +  }
 535 +  if (dictionaryPos == 0)
 536 +    previousByte = dictionary[dictionarySize - 1];
 537 +  else
 538 +    previousByte = dictionary[dictionaryPos - 1];
 539 +#else
 540 +
 541 +int LzmaDecode(
 542 +    Byte *buffer, UInt32 bufferSize,
 543 +    int lc, int lp, int pb,
 544 +    #ifdef _LZMA_IN_CB
 545 +    ILzmaInCallback *inCallback,
 546 +    #else
 547 +    unsigned char *inStream, UInt32 inSize,
 548 +    #endif
 549 +    unsigned char *outStream, UInt32 outSize,
 550 +    UInt32 *outSizeProcessed)
 551 +{
 552 +  UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + lp));
 553 +  CProb *p = (CProb *)buffer;
 554 +  CRangeDecoder rd;
 555 +  UInt32 i;
 556 +  int state = 0;
 557 +  int previousIsMatch = 0;
 558 +  Byte previousByte = 0;
 559 +  UInt32 rep0 = 1, rep1 = 1, rep2 = 1, rep3 = 1;
 560 +  UInt32 nowPos = 0;
 561 +  UInt32 posStateMask = (1 << pb) - 1;
 562 +  UInt32 literalPosMask = (1 << lp) - 1;
 563 +  int len = 0;
 564 +  if (bufferSize < numProbs * sizeof(CProb))
 565 +    return LZMA_RESULT_NOT_ENOUGH_MEM;
 566 +  for (i = 0; i < numProbs; i++)
 567 +    p[i] = kBitModelTotal >> 1;
 568 +  RangeDecoderInit(&rd,
 569 +      #ifdef _LZMA_IN_CB
 570 +      inCallback
 571 +      #else
 572 +      inStream, inSize
 573 +      #endif
 574 +      );
 575 +#endif
 576 +
 577 +  *outSizeProcessed = 0;
 578 +  while(nowPos < outSize)
 579 +  {
 580 +    int posState = (int)(
 581 +        (nowPos
 582 +        #ifdef _LZMA_OUT_READ
 583 +        + globalPos
 584 +        #endif
 585 +        )
 586 +        & posStateMask);
 587 +    #ifdef _LZMA_IN_CB
 588 +    if (rd.Result != LZMA_RESULT_OK)
 589 +      return rd.Result;
 590 +    #endif
 591 +    if (rd.ExtraBytes != 0)
 592 +      return LZMA_RESULT_DATA_ERROR;
 593 +    if (RangeDecoderBitDecode(p + IsMatch + (state << kNumPosBitsMax) + posState, &rd) == 0)
 594 +    {
 595 +      CProb *probs = p + Literal + (LZMA_LIT_SIZE *
 596 +        (((
 597 +        (nowPos
 598 +        #ifdef _LZMA_OUT_READ
 599 +        + globalPos
 600 +        #endif
 601 +        )
 602 +        & literalPosMask) << lc) + (previousByte >> (8 - lc))));
 603 +
 604 +      if (state < 4) state = 0;
 605 +      else if (state < 10) state -= 3;
 606 +      else state -= 6;
 607 +      if (previousIsMatch)
 608 +      {
 609 +        Byte matchByte;
 610 +        #ifdef _LZMA_OUT_READ
 611 +        UInt32 pos = dictionaryPos - rep0;
 612 +        if (pos >= dictionarySize)
 613 +          pos += dictionarySize;
 614 +        matchByte = dictionary[pos];
 615 +        #else
 616 +        matchByte = outStream[nowPos - rep0];
 617 +        #endif
 618 +        previousByte = LzmaLiteralDecodeMatch(probs, &rd, matchByte);
 619 +        previousIsMatch = 0;
 620 +      }
 621 +      else
 622 +        previousByte = LzmaLiteralDecode(probs, &rd);
 623 +      outStream[nowPos++] = previousByte;
 624 +      #ifdef _LZMA_OUT_READ
 625 +      dictionary[dictionaryPos] = previousByte;
 626 +      if (++dictionaryPos == dictionarySize)
 627 +        dictionaryPos = 0;
 628 +      #endif
 629 +    }
 630 +    else
 631 +    {
 632 +      previousIsMatch = 1;
 633 +      if (RangeDecoderBitDecode(p + IsRep + state, &rd) == 1)
 634 +      {
 635 +        if (RangeDecoderBitDecode(p + IsRepG0 + state, &rd) == 0)
 636 +        {
 637 +          if (RangeDecoderBitDecode(p + IsRep0Long + (state << kNumPosBitsMax) + posState, &rd) == 0)
 638 +          {
 639 +            #ifdef _LZMA_OUT_READ
 640 +            UInt32 pos;
 641 +            #endif
 642 +            if (
 643 +               (nowPos
 644 +                #ifdef _LZMA_OUT_READ
 645 +                + globalPos
 646 +                #endif
 647 +               )
 648 +               == 0)
 649 +              return LZMA_RESULT_DATA_ERROR;
 650 +            state = state < 7 ? 9 : 11;
 651 +            #ifdef _LZMA_OUT_READ
 652 +            pos = dictionaryPos - rep0;
 653 +            if (pos >= dictionarySize)
 654 +              pos += dictionarySize;
 655 +            previousByte = dictionary[pos];
 656 +            dictionary[dictionaryPos] = previousByte;
 657 +            if (++dictionaryPos == dictionarySize)
 658 +              dictionaryPos = 0;
 659 +            #else
 660 +            previousByte = outStream[nowPos - rep0];
 661 +            #endif
 662 +            outStream[nowPos++] = previousByte;
 663 +            continue;
 664 +          }
 665 +        }
 666 +        else
 667 +        {
 668 +          UInt32 distance;
 669 +          if(RangeDecoderBitDecode(p + IsRepG1 + state, &rd) == 0)
 670 +            distance = rep1;
 671 +          else
 672 +          {
 673 +            if(RangeDecoderBitDecode(p + IsRepG2 + state, &rd) == 0)
 674 +              distance = rep2;
 675 +            else
 676 +            {
 677 +              distance = rep3;
 678 +              rep3 = rep2;
 679 +            }
 680 +            rep2 = rep1;
 681 +          }
 682 +          rep1 = rep0;
 683 +          rep0 = distance;
 684 +        }
 685 +        len = LzmaLenDecode(p + RepLenCoder, &rd, posState);
 686 +        state = state < 7 ? 8 : 11;
 687 +      }
 688 +      else
 689 +      {
 690 +        int posSlot;
 691 +        rep3 = rep2;
 692 +        rep2 = rep1;
 693 +        rep1 = rep0;
 694 +        state = state < 7 ? 7 : 10;
 695 +        len = LzmaLenDecode(p + LenCoder, &rd, posState);
 696 +        posSlot = RangeDecoderBitTreeDecode(p + PosSlot +
 697 +            ((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) <<
 698 +            kNumPosSlotBits), kNumPosSlotBits, &rd);
 699 +        if (posSlot >= kStartPosModelIndex)
 700 +        {
 701 +          int numDirectBits = ((posSlot >> 1) - 1);
 702 +          rep0 = ((2 | ((UInt32)posSlot & 1)) << numDirectBits);
 703 +          if (posSlot < kEndPosModelIndex)
 704 +          {
 705 +            rep0 += RangeDecoderReverseBitTreeDecode(
 706 +                p + SpecPos + rep0 - posSlot - 1, numDirectBits, &rd);
 707 +          }
 708 +          else
 709 +          {
 710 +            rep0 += RangeDecoderDecodeDirectBits(&rd,
 711 +                numDirectBits - kNumAlignBits) << kNumAlignBits;
 712 +            rep0 += RangeDecoderReverseBitTreeDecode(p + Align, kNumAlignBits, &rd);
 713 +          }
 714 +        }
 715 +        else
 716 +          rep0 = posSlot;
 717 +        rep0++;
 718 +      }
 719 +      if (rep0 == (UInt32)(0))
 720 +      {
 721 +        /* it's for stream version */
 722 +        len = -1;
 723 +        break;
 724 +      }
 725 +      if (rep0 > nowPos
 726 +        #ifdef _LZMA_OUT_READ
 727 +        + globalPos
 728 +        #endif
 729 +        )
 730 +      {
 731 +        return LZMA_RESULT_DATA_ERROR;
 732 +      }
 733 +      len += kMatchMinLen;
 734 +      do
 735 +      {
 736 +        #ifdef _LZMA_OUT_READ
 737 +        UInt32 pos = dictionaryPos - rep0;
 738 +        if (pos >= dictionarySize)
 739 +          pos += dictionarySize;
 740 +        previousByte = dictionary[pos];
 741 +        dictionary[dictionaryPos] = previousByte;
 742 +        if (++dictionaryPos == dictionarySize)
 743 +          dictionaryPos = 0;
 744 +        #else
 745 +        previousByte = outStream[nowPos - rep0];
 746 +        #endif
 747 +        outStream[nowPos++] = previousByte;
 748 +        len--;
 749 +      }
 750 +      while(len > 0 && nowPos < outSize);
 751 +    }
 752 +  }
 753 +
 754 +  #ifdef _LZMA_OUT_READ
 755 +  vs->RangeDecoder = rd;
 756 +  vs->DictionaryPos = dictionaryPos;
 757 +  vs->GlobalPos = globalPos + nowPos;
 758 +  vs->Reps[0] = rep0;
 759 +  vs->Reps[1] = rep1;
 760 +  vs->Reps[2] = rep2;
 761 +  vs->Reps[3] = rep3;
 762 +  vs->State = state;
 763 +  vs->PreviousIsMatch = previousIsMatch;
 764 +  vs->RemainLen = len;
 765 +  #endif
 766 +
 767 +  *outSizeProcessed = nowPos;
 768 +  return LZMA_RESULT_OK;
 769 +}
 770 Index: linux-2.4.35.4/fs/squashfs/LzmaDecode.h
 771 ===================================================================
 772 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
 773 +++ linux-2.4.35.4/fs/squashfs/LzmaDecode.h     2007-12-15 05:19:49.027214939 +0100
 774 @@ -0,0 +1,100 @@
 775 +/*
 776 +  LzmaDecode.h
 777 +  LZMA Decoder interface
 778 +
 779 +  LZMA SDK 4.05 Copyright (c) 1999-2004 Igor Pavlov (2004-08-25)
 780 +  http://www.7-zip.org/
 781 +
 782 +  LZMA SDK is licensed under two licenses:
 783 +  1) GNU Lesser General Public License (GNU LGPL)
 784 +  2) Common Public License (CPL)
 785 +  It means that you can select one of these two licenses and
 786 +  follow rules of that license.
 787 +
 788 +  SPECIAL EXCEPTION:
 789 +  Igor Pavlov, as the author of this code, expressly permits you to
 790 +  statically or dynamically link your code (or bind by name) to the
 791 +  interfaces of this file without subjecting your linked code to the
 792 +  terms of the CPL or GNU LGPL. Any modifications or additions
 793 +  to this file, however, are subject to the LGPL or CPL terms.
 794 +*/
 795 +
 796 +#ifndef __LZMADECODE_H
 797 +#define __LZMADECODE_H
 798 +
 799 +/* #define _LZMA_IN_CB */
 800 +/* Use callback for input data */
 801 +
 802 +/* #define _LZMA_OUT_READ */
 803 +/* Use read function for output data */
 804 +
 805 +/* #define _LZMA_PROB32 */
 806 +/* It can increase speed on some 32-bit CPUs,
 807 +   but memory usage will be doubled in that case */
 808 +
 809 +/* #define _LZMA_LOC_OPT */
 810 +/* Enable local speed optimizations inside code */
 811 +
 812 +#ifndef UInt32
 813 +#ifdef _LZMA_UINT32_IS_ULONG
 814 +#define UInt32 unsigned long
 815 +#else
 816 +#define UInt32 unsigned int
 817 +#endif
 818 +#endif
 819 +
 820 +#ifdef _LZMA_PROB32
 821 +#define CProb UInt32
 822 +#else
 823 +#define CProb unsigned short
 824 +#endif
 825 +
 826 +#define LZMA_RESULT_OK 0
 827 +#define LZMA_RESULT_DATA_ERROR 1
 828 +#define LZMA_RESULT_NOT_ENOUGH_MEM 2
 829 +
 830 +#ifdef _LZMA_IN_CB
 831 +typedef struct _ILzmaInCallback
 832 +{
 833 +  int (*Read)(void *object, unsigned char **buffer, UInt32 *bufferSize);
 834 +} ILzmaInCallback;
 835 +#endif
 836 +
 837 +#define LZMA_BASE_SIZE 1846
 838 +#define LZMA_LIT_SIZE 768
 839 +
 840 +/*
 841 +bufferSize = (LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp)))* sizeof(CProb)
 842 +bufferSize += 100 in case of _LZMA_OUT_READ
 843 +by default CProb is unsigned short,
 844 +but if specify _LZMA_PROB_32, CProb will be UInt32(unsigned int)
 845 +*/
 846 +
 847 +#ifdef _LZMA_OUT_READ
 848 +int LzmaDecoderInit(
 849 +    unsigned char *buffer, UInt32 bufferSize,
 850 +    int lc, int lp, int pb,
 851 +    unsigned char *dictionary, UInt32 dictionarySize,
 852 +  #ifdef _LZMA_IN_CB
 853 +    ILzmaInCallback *inCallback
 854 +  #else
 855 +    unsigned char *inStream, UInt32 inSize
 856 +  #endif
 857 +);
 858 +#endif
 859 +
 860 +int LzmaDecode(
 861 +    unsigned char *buffer,
 862 +  #ifndef _LZMA_OUT_READ
 863 +    UInt32 bufferSize,
 864 +    int lc, int lp, int pb,
 865 +  #ifdef _LZMA_IN_CB
 866 +    ILzmaInCallback *inCallback,
 867 +  #else
 868 +    unsigned char *inStream, UInt32 inSize,
 869 +  #endif
 870 +  #endif
 871 +    unsigned char *outStream, UInt32 outSize,
 872 +    UInt32 *outSizeProcessed);
 873 +
 874 +#endif
 875 Index: linux-2.4.35.4/fs/squashfs/Makefile
 876 ===================================================================
 877 --- linux-2.4.35.4.orig/fs/squashfs/Makefile    2007-12-15 05:19:48.651193513 +0100
 878 +++ linux-2.4.35.4/fs/squashfs/Makefile 2007-12-15 05:19:49.031215169 +0100
 879 @@ -4,7 +4,7 @@
 880
 881  O_TARGET := squashfs.o
 882
 883 -obj-y  := inode.o squashfs2_0.o
 884 +obj-y  := inode.o squashfs2_0.o LzmaDecode.o
 885
 886  obj-m := $(O_TARGET)
 887