target/linux/generic-2.6/patches/002-squashfs_lzma.patch

   1 diff -urN linux-2.6.19.old/fs/squashfs/inode.c linux-2.6.19.dev/fs/squashfs/inode.c
   2 --- linux-2.6.19.old/fs/squashfs/inode.c        2006-12-14 03:13:20.000000000 +0100
   3 +++ linux-2.6.19.dev/fs/squashfs/inode.c        2006-12-14 03:13:20.000000000 +0100
   4 @@ -4,6 +4,9 @@
   5   * Copyright (c) 2002, 2003, 2004, 2005, 2006
   6   * Phillip Lougher <phillip@lougher.org.uk>
   7   *
   8 + * LZMA decompressor support added by Oleg I. Vdovikin
   9 + * Copyright (c) 2005 Oleg I.Vdovikin <oleg@cs.msu.su>
  10 + *
  11   * This program is free software; you can redistribute it and/or
  12   * modify it under the terms of the GNU General Public License
  13   * as published by the Free Software Foundation; either version 2,
  14 @@ -21,6 +24,7 @@
  15   * inode.c
  16   */
  17
  18 +#define SQUASHFS_LZMA
  19  #include <linux/types.h>
  20  #include <linux/squashfs_fs.h>
  21  #include <linux/module.h>
  22 @@ -44,6 +48,19 @@
  23
  24  #include "squashfs.h"
  25
  26 +#ifdef SQUASHFS_LZMA
  27 +#include "LzmaDecode.h"
  28 +
  29 +/* default LZMA settings, should be in sync with mksquashfs */
  30 +#define LZMA_LC 3
  31 +#define LZMA_LP 0
  32 +#define LZMA_PB 2
  33 +
  34 +#define LZMA_WORKSPACE_SIZE ((LZMA_BASE_SIZE + \
  35 +      (LZMA_LIT_SIZE << (LZMA_LC + LZMA_LP))) * sizeof(CProb))
  36 +
  37 +#endif
  38 +
  39  static void squashfs_put_super(struct super_block *);
  40  static int squashfs_statfs(struct dentry *, struct kstatfs *);
  41  static int squashfs_symlink_readpage(struct file *file, struct page *page);
  42 @@ -64,7 +81,11 @@
  43                         const char *, void *, struct vfsmount *);
  44
  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 struct file_system_type squashfs_fs_type = {
  53         .owner = THIS_MODULE,
  54 @@ -249,6 +270,15 @@
  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 @@ -263,7 +293,7 @@
  71                         bytes = 0;
  72                 } else
  73                         bytes = stream.total_out;
  74 -
  75 +#endif
  76                 up(&msblk->read_data_mutex);
  77         }
  78
  79 @@ -2045,15 +2075,19 @@
  80         printk(KERN_INFO "squashfs: version 3.0 (2006/03/15) "
  81                 "Phillip Lougher\n");
  82
  83 +#ifndef SQUASHFS_LZMA
  84         if (!(stream.workspace = vmalloc(zlib_inflate_workspacesize()))) {
  85                 ERROR("Failed to allocate zlib workspace\n");
  86                 destroy_inodecache();
  87                 err = -ENOMEM;
  88                 goto out;
  89         }
  90 +#endif
  91
  92         if ((err = register_filesystem(&squashfs_fs_type))) {
  93 +#ifndef SQUASHFS_LZMA
  94                 vfree(stream.workspace);
  95 +#endif
  96                 destroy_inodecache();
  97         }
  98
  99 @@ -2064,7 +2098,9 @@
 100
 101  static void __exit exit_squashfs_fs(void)
 102  {
 103 +#ifndef SQUASHFS_LZMA
 104         vfree(stream.workspace);
 105 +#endif
 106         unregister_filesystem(&squashfs_fs_type);
 107         destroy_inodecache();
 108  }
 109 diff -urN linux-2.6.19.old/fs/squashfs/LzmaDecode.c linux-2.6.19.dev/fs/squashfs/LzmaDecode.c
 110 --- linux-2.6.19.old/fs/squashfs/LzmaDecode.c   1970-01-01 01:00:00.000000000 +0100
 111 +++ linux-2.6.19.dev/fs/squashfs/LzmaDecode.c   2006-12-14 03:13:20.000000000 +0100
 112 @@ -0,0 +1,663 @@
 113 +/*
 114 +  LzmaDecode.c
 115 +  LZMA Decoder
 116 +
 117 +  LZMA SDK 4.05 Copyright (c) 1999-2004 Igor Pavlov (2004-08-25)
 118 +  http://www.7-zip.org/
 119 +
 120 +  LZMA SDK is licensed under two licenses:
 121 +  1) GNU Lesser General Public License (GNU LGPL)
 122 +  2) Common Public License (CPL)
 123 +  It means that you can select one of these two licenses and
 124 +  follow rules of that license.
 125 +
 126 +  SPECIAL EXCEPTION:
 127 +  Igor Pavlov, as the author of this code, expressly permits you to
 128 +  statically or dynamically link your code (or bind by name) to the
 129 +  interfaces of this file without subjecting your linked code to the
 130 +  terms of the CPL or GNU LGPL. Any modifications or additions
 131 +  to this file, however, are subject to the LGPL or CPL terms.
 132 +*/
 133 +
 134 +#include "LzmaDecode.h"
 135 +
 136 +#ifndef Byte
 137 +#define Byte unsigned char
 138 +#endif
 139 +
 140 +#define kNumTopBits 24
 141 +#define kTopValue ((UInt32)1 << kNumTopBits)
 142 +
 143 +#define kNumBitModelTotalBits 11
 144 +#define kBitModelTotal (1 << kNumBitModelTotalBits)
 145 +#define kNumMoveBits 5
 146 +
 147 +typedef struct _CRangeDecoder
 148 +{
 149 +  Byte *Buffer;
 150 +  Byte *BufferLim;
 151 +  UInt32 Range;
 152 +  UInt32 Code;
 153 +  #ifdef _LZMA_IN_CB
 154 +  ILzmaInCallback *InCallback;
 155 +  int Result;
 156 +  #endif
 157 +  int ExtraBytes;
 158 +} CRangeDecoder;
 159 +
 160 +Byte RangeDecoderReadByte(CRangeDecoder *rd)
 161 +{
 162 +  if (rd->Buffer == rd->BufferLim)
 163 +  {
 164 +    #ifdef _LZMA_IN_CB
 165 +    UInt32 size;
 166 +    rd->Result = rd->InCallback->Read(rd->InCallback, &rd->Buffer, &size);
 167 +    rd->BufferLim = rd->Buffer + size;
 168 +    if (size == 0)
 169 +    #endif
 170 +    {
 171 +      rd->ExtraBytes = 1;
 172 +      return 0xFF;
 173 +    }
 174 +  }
 175 +  return (*rd->Buffer++);
 176 +}
 177 +
 178 +/* #define ReadByte (*rd->Buffer++) */
 179 +#define ReadByte (RangeDecoderReadByte(rd))
 180 +
 181 +void RangeDecoderInit(CRangeDecoder *rd,
 182 +  #ifdef _LZMA_IN_CB
 183 +    ILzmaInCallback *inCallback
 184 +  #else
 185 +    Byte *stream, UInt32 bufferSize
 186 +  #endif
 187 +    )
 188 +{
 189 +  int i;
 190 +  #ifdef _LZMA_IN_CB
 191 +  rd->InCallback = inCallback;
 192 +  rd->Buffer = rd->BufferLim = 0;
 193 +  #else
 194 +  rd->Buffer = stream;
 195 +  rd->BufferLim = stream + bufferSize;
 196 +  #endif
 197 +  rd->ExtraBytes = 0;
 198 +  rd->Code = 0;
 199 +  rd->Range = (0xFFFFFFFF);
 200 +  for(i = 0; i < 5; i++)
 201 +    rd->Code = (rd->Code << 8) | ReadByte;
 202 +}
 203 +
 204 +#define RC_INIT_VAR UInt32 range = rd->Range; UInt32 code = rd->Code;
 205 +#define RC_FLUSH_VAR rd->Range = range; rd->Code = code;
 206 +#define RC_NORMALIZE if (range < kTopValue) { range <<= 8; code = (code << 8) | ReadByte; }
 207 +
 208 +UInt32 RangeDecoderDecodeDirectBits(CRangeDecoder *rd, int numTotalBits)
 209 +{
 210 +  RC_INIT_VAR
 211 +  UInt32 result = 0;
 212 +  int i;
 213 +  for (i = numTotalBits; i > 0; i--)
 214 +  {
 215 +    /* UInt32 t; */
 216 +    range >>= 1;
 217 +
 218 +    result <<= 1;
 219 +    if (code >= range)
 220 +    {
 221 +      code -= range;
 222 +      result |= 1;
 223 +    }
 224 +    /*
 225 +    t = (code - range) >> 31;
 226 +    t &= 1;
 227 +    code -= range & (t - 1);
 228 +    result = (result + result) | (1 - t);
 229 +    */
 230 +    RC_NORMALIZE
 231 +  }
 232 +  RC_FLUSH_VAR
 233 +  return result;
 234 +}
 235 +
 236 +int RangeDecoderBitDecode(CProb *prob, CRangeDecoder *rd)
 237 +{
 238 +  UInt32 bound = (rd->Range >> kNumBitModelTotalBits) * *prob;
 239 +  if (rd->Code < bound)
 240 +  {
 241 +    rd->Range = bound;
 242 +    *prob += (kBitModelTotal - *prob) >> kNumMoveBits;
 243 +    if (rd->Range < kTopValue)
 244 +    {
 245 +      rd->Code = (rd->Code << 8) | ReadByte;
 246 +      rd->Range <<= 8;
 247 +    }
 248 +    return 0;
 249 +  }
 250 +  else
 251 +  {
 252 +    rd->Range -= bound;
 253 +    rd->Code -= bound;
 254 +    *prob -= (*prob) >> kNumMoveBits;
 255 +    if (rd->Range < kTopValue)
 256 +    {
 257 +      rd->Code = (rd->Code << 8) | ReadByte;
 258 +      rd->Range <<= 8;
 259 +    }
 260 +    return 1;
 261 +  }
 262 +}
 263 +
 264 +#define RC_GET_BIT2(prob, mi, A0, A1) \
 265 +  UInt32 bound = (range >> kNumBitModelTotalBits) * *prob; \
 266 +  if (code < bound) \
 267 +    { A0; range = bound; *prob += (kBitModelTotal - *prob) >> kNumMoveBits; mi <<= 1; } \
 268 +  else \
 269 +    { A1; range -= bound; code -= bound; *prob -= (*prob) >> kNumMoveBits; mi = (mi + mi) + 1; } \
 270 +  RC_NORMALIZE
 271 +
 272 +#define RC_GET_BIT(prob, mi) RC_GET_BIT2(prob, mi, ; , ;)
 273 +
 274 +int RangeDecoderBitTreeDecode(CProb *probs, int numLevels, CRangeDecoder *rd)
 275 +{
 276 +  int mi = 1;
 277 +  int i;
 278 +  #ifdef _LZMA_LOC_OPT
 279 +  RC_INIT_VAR
 280 +  #endif
 281 +  for(i = numLevels; i > 0; i--)
 282 +  {
 283 +    #ifdef _LZMA_LOC_OPT
 284 +    CProb *prob = probs + mi;
 285 +    RC_GET_BIT(prob, mi)
 286 +    #else
 287 +    mi = (mi + mi) + RangeDecoderBitDecode(probs + mi, rd);
 288 +    #endif
 289 +  }
 290 +  #ifdef _LZMA_LOC_OPT
 291 +  RC_FLUSH_VAR
 292 +  #endif
 293 +  return mi - (1 << numLevels);
 294 +}
 295 +
 296 +int RangeDecoderReverseBitTreeDecode(CProb *probs, int numLevels, CRangeDecoder *rd)
 297 +{
 298 +  int mi = 1;
 299 +  int i;
 300 +  int symbol = 0;
 301 +  #ifdef _LZMA_LOC_OPT
 302 +  RC_INIT_VAR
 303 +  #endif
 304 +  for(i = 0; i < numLevels; i++)
 305 +  {
 306 +    #ifdef _LZMA_LOC_OPT
 307 +    CProb *prob = probs + mi;
 308 +    RC_GET_BIT2(prob, mi, ; , symbol |= (1 << i))
 309 +    #else
 310 +    int bit = RangeDecoderBitDecode(probs + mi, rd);
 311 +    mi = mi + mi + bit;
 312 +    symbol |= (bit << i);
 313 +    #endif
 314 +  }
 315 +  #ifdef _LZMA_LOC_OPT
 316 +  RC_FLUSH_VAR
 317 +  #endif
 318 +  return symbol;
 319 +}
 320 +
 321 +Byte LzmaLiteralDecode(CProb *probs, CRangeDecoder *rd)
 322 +{
 323 +  int symbol = 1;
 324 +  #ifdef _LZMA_LOC_OPT
 325 +  RC_INIT_VAR
 326 +  #endif
 327 +  do
 328 +  {
 329 +    #ifdef _LZMA_LOC_OPT
 330 +    CProb *prob = probs + symbol;
 331 +    RC_GET_BIT(prob, symbol)
 332 +    #else
 333 +    symbol = (symbol + symbol) | RangeDecoderBitDecode(probs + symbol, rd);
 334 +    #endif
 335 +  }
 336 +  while (symbol < 0x100);
 337 +  #ifdef _LZMA_LOC_OPT
 338 +  RC_FLUSH_VAR
 339 +  #endif
 340 +  return symbol;
 341 +}
 342 +
 343 +Byte LzmaLiteralDecodeMatch(CProb *probs, CRangeDecoder *rd, Byte matchByte)
 344 +{
 345 +  int symbol = 1;
 346 +  #ifdef _LZMA_LOC_OPT
 347 +  RC_INIT_VAR
 348 +  #endif
 349 +  do
 350 +  {
 351 +    int bit;
 352 +    int matchBit = (matchByte >> 7) & 1;
 353 +    matchByte <<= 1;
 354 +    #ifdef _LZMA_LOC_OPT
 355 +    {
 356 +      CProb *prob = probs + ((1 + matchBit) << 8) + symbol;
 357 +      RC_GET_BIT2(prob, symbol, bit = 0, bit = 1)
 358 +    }
 359 +    #else
 360 +    bit = RangeDecoderBitDecode(probs + ((1 + matchBit) << 8) + symbol, rd);
 361 +    symbol = (symbol << 1) | bit;
 362 +    #endif
 363 +    if (matchBit != bit)
 364 +    {
 365 +      while (symbol < 0x100)
 366 +      {
 367 +        #ifdef _LZMA_LOC_OPT
 368 +        CProb *prob = probs + symbol;
 369 +        RC_GET_BIT(prob, symbol)
 370 +        #else
 371 +        symbol = (symbol + symbol) | RangeDecoderBitDecode(probs + symbol, rd);
 372 +        #endif
 373 +      }
 374 +      break;
 375 +    }
 376 +  }
 377 +  while (symbol < 0x100);
 378 +  #ifdef _LZMA_LOC_OPT
 379 +  RC_FLUSH_VAR
 380 +  #endif
 381 +  return symbol;
 382 +}
 383 +
 384 +#define kNumPosBitsMax 4
 385 +#define kNumPosStatesMax (1 << kNumPosBitsMax)
 386 +
 387 +#define kLenNumLowBits 3
 388 +#define kLenNumLowSymbols (1 << kLenNumLowBits)
 389 +#define kLenNumMidBits 3
 390 +#define kLenNumMidSymbols (1 << kLenNumMidBits)
 391 +#define kLenNumHighBits 8
 392 +#define kLenNumHighSymbols (1 << kLenNumHighBits)
 393 +
 394 +#define LenChoice 0
 395 +#define LenChoice2 (LenChoice + 1)
 396 +#define LenLow (LenChoice2 + 1)
 397 +#define LenMid (LenLow + (kNumPosStatesMax << kLenNumLowBits))
 398 +#define LenHigh (LenMid + (kNumPosStatesMax << kLenNumMidBits))
 399 +#define kNumLenProbs (LenHigh + kLenNumHighSymbols)
 400 +
 401 +int LzmaLenDecode(CProb *p, CRangeDecoder *rd, int posState)
 402 +{
 403 +  if(RangeDecoderBitDecode(p + LenChoice, rd) == 0)
 404 +    return RangeDecoderBitTreeDecode(p + LenLow +
 405 +        (posState << kLenNumLowBits), kLenNumLowBits, rd);
 406 +  if(RangeDecoderBitDecode(p + LenChoice2, rd) == 0)
 407 +    return kLenNumLowSymbols + RangeDecoderBitTreeDecode(p + LenMid +
 408 +        (posState << kLenNumMidBits), kLenNumMidBits, rd);
 409 +  return kLenNumLowSymbols + kLenNumMidSymbols +
 410 +      RangeDecoderBitTreeDecode(p + LenHigh, kLenNumHighBits, rd);
 411 +}
 412 +
 413 +#define kNumStates 12
 414 +
 415 +#define kStartPosModelIndex 4
 416 +#define kEndPosModelIndex 14
 417 +#define kNumFullDistances (1 << (kEndPosModelIndex >> 1))
 418 +
 419 +#define kNumPosSlotBits 6
 420 +#define kNumLenToPosStates 4
 421 +
 422 +#define kNumAlignBits 4
 423 +#define kAlignTableSize (1 << kNumAlignBits)
 424 +
 425 +#define kMatchMinLen 2
 426 +
 427 +#define IsMatch 0
 428 +#define IsRep (IsMatch + (kNumStates << kNumPosBitsMax))
 429 +#define IsRepG0 (IsRep + kNumStates)
 430 +#define IsRepG1 (IsRepG0 + kNumStates)
 431 +#define IsRepG2 (IsRepG1 + kNumStates)
 432 +#define IsRep0Long (IsRepG2 + kNumStates)
 433 +#define PosSlot (IsRep0Long + (kNumStates << kNumPosBitsMax))
 434 +#define SpecPos (PosSlot + (kNumLenToPosStates << kNumPosSlotBits))
 435 +#define Align (SpecPos + kNumFullDistances - kEndPosModelIndex)
 436 +#define LenCoder (Align + kAlignTableSize)
 437 +#define RepLenCoder (LenCoder + kNumLenProbs)
 438 +#define Literal (RepLenCoder + kNumLenProbs)
 439 +
 440 +#if Literal != LZMA_BASE_SIZE
 441 +StopCompilingDueBUG
 442 +#endif
 443 +
 444 +#ifdef _LZMA_OUT_READ
 445 +
 446 +typedef struct _LzmaVarState
 447 +{
 448 +  CRangeDecoder RangeDecoder;
 449 +  Byte *Dictionary;
 450 +  UInt32 DictionarySize;
 451 +  UInt32 DictionaryPos;
 452 +  UInt32 GlobalPos;
 453 +  UInt32 Reps[4];
 454 +  int lc;
 455 +  int lp;
 456 +  int pb;
 457 +  int State;
 458 +  int PreviousIsMatch;
 459 +  int RemainLen;
 460 +} LzmaVarState;
 461 +
 462 +int LzmaDecoderInit(
 463 +    unsigned char *buffer, UInt32 bufferSize,
 464 +    int lc, int lp, int pb,
 465 +    unsigned char *dictionary, UInt32 dictionarySize,
 466 +    #ifdef _LZMA_IN_CB
 467 +    ILzmaInCallback *inCallback
 468 +    #else
 469 +    unsigned char *inStream, UInt32 inSize
 470 +    #endif
 471 +    )
 472 +{
 473 +  LzmaVarState *vs = (LzmaVarState *)buffer;
 474 +  CProb *p = (CProb *)(buffer + sizeof(LzmaVarState));
 475 +  UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + lp));
 476 +  UInt32 i;
 477 +  if (bufferSize < numProbs * sizeof(CProb) + sizeof(LzmaVarState))
 478 +    return LZMA_RESULT_NOT_ENOUGH_MEM;
 479 +  vs->Dictionary = dictionary;
 480 +  vs->DictionarySize = dictionarySize;
 481 +  vs->DictionaryPos = 0;
 482 +  vs->GlobalPos = 0;
 483 +  vs->Reps[0] = vs->Reps[1] = vs->Reps[2] = vs->Reps[3] = 1;
 484 +  vs->lc = lc;
 485 +  vs->lp = lp;
 486 +  vs->pb = pb;
 487 +  vs->State = 0;
 488 +  vs->PreviousIsMatch = 0;
 489 +  vs->RemainLen = 0;
 490 +  dictionary[dictionarySize - 1] = 0;
 491 +  for (i = 0; i < numProbs; i++)
 492 +    p[i] = kBitModelTotal >> 1;
 493 +  RangeDecoderInit(&vs->RangeDecoder,
 494 +      #ifdef _LZMA_IN_CB
 495 +      inCallback
 496 +      #else
 497 +      inStream, inSize
 498 +      #endif
 499 +  );
 500 +  return LZMA_RESULT_OK;
 501 +}
 502 +
 503 +int LzmaDecode(unsigned char *buffer,
 504 +    unsigned char *outStream, UInt32 outSize,
 505 +    UInt32 *outSizeProcessed)
 506 +{
 507 +  LzmaVarState *vs = (LzmaVarState *)buffer;
 508 +  CProb *p = (CProb *)(buffer + sizeof(LzmaVarState));
 509 +  CRangeDecoder rd = vs->RangeDecoder;
 510 +  int state = vs->State;
 511 +  int previousIsMatch = vs->PreviousIsMatch;
 512 +  Byte previousByte;
 513 +  UInt32 rep0 = vs->Reps[0], rep1 = vs->Reps[1], rep2 = vs->Reps[2], rep3 = vs->Reps[3];
 514 +  UInt32 nowPos = 0;
 515 +  UInt32 posStateMask = (1 << (vs->pb)) - 1;
 516 +  UInt32 literalPosMask = (1 << (vs->lp)) - 1;
 517 +  int lc = vs->lc;
 518 +  int len = vs->RemainLen;
 519 +  UInt32 globalPos = vs->GlobalPos;
 520 +
 521 +  Byte *dictionary = vs->Dictionary;
 522 +  UInt32 dictionarySize = vs->DictionarySize;
 523 +  UInt32 dictionaryPos = vs->DictionaryPos;
 524 +
 525 +  if (len == -1)
 526 +  {
 527 +    *outSizeProcessed = 0;
 528 +    return LZMA_RESULT_OK;
 529 +  }
 530 +
 531 +  while(len > 0 && nowPos < outSize)
 532 +  {
 533 +    UInt32 pos = dictionaryPos - rep0;
 534 +    if (pos >= dictionarySize)
 535 +      pos += dictionarySize;
 536 +    outStream[nowPos++] = dictionary[dictionaryPos] = dictionary[pos];
 537 +    if (++dictionaryPos == dictionarySize)
 538 +      dictionaryPos = 0;
 539 +    len--;
 540 +  }
 541 +  if (dictionaryPos == 0)
 542 +    previousByte = dictionary[dictionarySize - 1];
 543 +  else
 544 +    previousByte = dictionary[dictionaryPos - 1];
 545 +#else
 546 +
 547 +int LzmaDecode(
 548 +    Byte *buffer, UInt32 bufferSize,
 549 +    int lc, int lp, int pb,
 550 +    #ifdef _LZMA_IN_CB
 551 +    ILzmaInCallback *inCallback,
 552 +    #else
 553 +    unsigned char *inStream, UInt32 inSize,
 554 +    #endif
 555 +    unsigned char *outStream, UInt32 outSize,
 556 +    UInt32 *outSizeProcessed)
 557 +{
 558 +  UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + lp));
 559 +  CProb *p = (CProb *)buffer;
 560 +  CRangeDecoder rd;
 561 +  UInt32 i;
 562 +  int state = 0;
 563 +  int previousIsMatch = 0;
 564 +  Byte previousByte = 0;
 565 +  UInt32 rep0 = 1, rep1 = 1, rep2 = 1, rep3 = 1;
 566 +  UInt32 nowPos = 0;
 567 +  UInt32 posStateMask = (1 << pb) - 1;
 568 +  UInt32 literalPosMask = (1 << lp) - 1;
 569 +  int len = 0;
 570 +  if (bufferSize < numProbs * sizeof(CProb))
 571 +    return LZMA_RESULT_NOT_ENOUGH_MEM;
 572 +  for (i = 0; i < numProbs; i++)
 573 +    p[i] = kBitModelTotal >> 1;
 574 +  RangeDecoderInit(&rd,
 575 +      #ifdef _LZMA_IN_CB
 576 +      inCallback
 577 +      #else
 578 +      inStream, inSize
 579 +      #endif
 580 +      );
 581 +#endif
 582 +
 583 +  *outSizeProcessed = 0;
 584 +  while(nowPos < outSize)
 585 +  {
 586 +    int posState = (int)(
 587 +        (nowPos
 588 +        #ifdef _LZMA_OUT_READ
 589 +        + globalPos
 590 +        #endif
 591 +        )
 592 +        & posStateMask);
 593 +    #ifdef _LZMA_IN_CB
 594 +    if (rd.Result != LZMA_RESULT_OK)
 595 +      return rd.Result;
 596 +    #endif
 597 +    if (rd.ExtraBytes != 0)
 598 +      return LZMA_RESULT_DATA_ERROR;
 599 +    if (RangeDecoderBitDecode(p + IsMatch + (state << kNumPosBitsMax) + posState, &rd) == 0)
 600 +    {
 601 +      CProb *probs = p + Literal + (LZMA_LIT_SIZE *
 602 +        (((
 603 +        (nowPos
 604 +        #ifdef _LZMA_OUT_READ
 605 +        + globalPos
 606 +        #endif
 607 +        )
 608 +        & literalPosMask) << lc) + (previousByte >> (8 - lc))));
 609 +
 610 +      if (state < 4) state = 0;
 611 +      else if (state < 10) state -= 3;
 612 +      else state -= 6;
 613 +      if (previousIsMatch)
 614 +      {
 615 +        Byte matchByte;
 616 +        #ifdef _LZMA_OUT_READ
 617 +        UInt32 pos = dictionaryPos - rep0;
 618 +        if (pos >= dictionarySize)
 619 +          pos += dictionarySize;
 620 +        matchByte = dictionary[pos];
 621 +        #else
 622 +        matchByte = outStream[nowPos - rep0];
 623 +        #endif
 624 +        previousByte = LzmaLiteralDecodeMatch(probs, &rd, matchByte);
 625 +        previousIsMatch = 0;
 626 +      }
 627 +      else
 628 +        previousByte = LzmaLiteralDecode(probs, &rd);
 629 +      outStream[nowPos++] = previousByte;
 630 +      #ifdef _LZMA_OUT_READ
 631 +      dictionary[dictionaryPos] = previousByte;
 632 +      if (++dictionaryPos == dictionarySize)
 633 +        dictionaryPos = 0;
 634 +      #endif
 635 +    }
 636 +    else
 637 +    {
 638 +      previousIsMatch = 1;
 639 +      if (RangeDecoderBitDecode(p + IsRep + state, &rd) == 1)
 640 +      {
 641 +        if (RangeDecoderBitDecode(p + IsRepG0 + state, &rd) == 0)
 642 +        {
 643 +          if (RangeDecoderBitDecode(p + IsRep0Long + (state << kNumPosBitsMax) + posState, &rd) == 0)
 644 +          {
 645 +            #ifdef _LZMA_OUT_READ
 646 +            UInt32 pos;
 647 +            #endif
 648 +            if (
 649 +               (nowPos
 650 +                #ifdef _LZMA_OUT_READ
 651 +                + globalPos
 652 +                #endif
 653 +               )
 654 +               == 0)
 655 +              return LZMA_RESULT_DATA_ERROR;
 656 +            state = state < 7 ? 9 : 11;
 657 +            #ifdef _LZMA_OUT_READ
 658 +            pos = dictionaryPos - rep0;
 659 +            if (pos >= dictionarySize)
 660 +              pos += dictionarySize;
 661 +            previousByte = dictionary[pos];
 662 +            dictionary[dictionaryPos] = previousByte;
 663 +            if (++dictionaryPos == dictionarySize)
 664 +              dictionaryPos = 0;
 665 +            #else
 666 +            previousByte = outStream[nowPos - rep0];
 667 +            #endif
 668 +            outStream[nowPos++] = previousByte;
 669 +            continue;
 670 +          }
 671 +        }
 672 +        else
 673 +        {
 674 +          UInt32 distance;
 675 +          if(RangeDecoderBitDecode(p + IsRepG1 + state, &rd) == 0)
 676 +            distance = rep1;
 677 +          else
 678 +          {
 679 +            if(RangeDecoderBitDecode(p + IsRepG2 + state, &rd) == 0)
 680 +              distance = rep2;
 681 +            else
 682 +            {
 683 +              distance = rep3;
 684 +              rep3 = rep2;
 685 +            }
 686 +            rep2 = rep1;
 687 +          }
 688 +          rep1 = rep0;
 689 +          rep0 = distance;
 690 +        }
 691 +        len = LzmaLenDecode(p + RepLenCoder, &rd, posState);
 692 +        state = state < 7 ? 8 : 11;
 693 +      }
 694 +      else
 695 +      {
 696 +        int posSlot;
 697 +        rep3 = rep2;
 698 +        rep2 = rep1;
 699 +        rep1 = rep0;
 700 +        state = state < 7 ? 7 : 10;
 701 +        len = LzmaLenDecode(p + LenCoder, &rd, posState);
 702 +        posSlot = RangeDecoderBitTreeDecode(p + PosSlot +
 703 +            ((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) <<
 704 +            kNumPosSlotBits), kNumPosSlotBits, &rd);
 705 +        if (posSlot >= kStartPosModelIndex)
 706 +        {
 707 +          int numDirectBits = ((posSlot >> 1) - 1);
 708 +          rep0 = ((2 | ((UInt32)posSlot & 1)) << numDirectBits);
 709 +          if (posSlot < kEndPosModelIndex)
 710 +          {
 711 +            rep0 += RangeDecoderReverseBitTreeDecode(
 712 +                p + SpecPos + rep0 - posSlot - 1, numDirectBits, &rd);
 713 +          }
 714 +          else
 715 +          {
 716 +            rep0 += RangeDecoderDecodeDirectBits(&rd,
 717 +                numDirectBits - kNumAlignBits) << kNumAlignBits;
 718 +            rep0 += RangeDecoderReverseBitTreeDecode(p + Align, kNumAlignBits, &rd);
 719 +          }
 720 +        }
 721 +        else
 722 +          rep0 = posSlot;
 723 +        rep0++;
 724 +      }
 725 +      if (rep0 == (UInt32)(0))
 726 +      {
 727 +        /* it's for stream version */
 728 +        len = -1;
 729 +        break;
 730 +      }
 731 +      if (rep0 > nowPos
 732 +        #ifdef _LZMA_OUT_READ
 733 +        + globalPos
 734 +        #endif
 735 +        )
 736 +      {
 737 +        return LZMA_RESULT_DATA_ERROR;
 738 +      }
 739 +      len += kMatchMinLen;
 740 +      do
 741 +      {
 742 +        #ifdef _LZMA_OUT_READ
 743 +        UInt32 pos = dictionaryPos - rep0;
 744 +        if (pos >= dictionarySize)
 745 +          pos += dictionarySize;
 746 +        previousByte = dictionary[pos];
 747 +        dictionary[dictionaryPos] = previousByte;
 748 +        if (++dictionaryPos == dictionarySize)
 749 +          dictionaryPos = 0;
 750 +        #else
 751 +        previousByte = outStream[nowPos - rep0];
 752 +        #endif
 753 +        outStream[nowPos++] = previousByte;
 754 +        len--;
 755 +      }
 756 +      while(len > 0 && nowPos < outSize);
 757 +    }
 758 +  }
 759 +
 760 +  #ifdef _LZMA_OUT_READ
 761 +  vs->RangeDecoder = rd;
 762 +  vs->DictionaryPos = dictionaryPos;
 763 +  vs->GlobalPos = globalPos + nowPos;
 764 +  vs->Reps[0] = rep0;
 765 +  vs->Reps[1] = rep1;
 766 +  vs->Reps[2] = rep2;
 767 +  vs->Reps[3] = rep3;
 768 +  vs->State = state;
 769 +  vs->PreviousIsMatch = previousIsMatch;
 770 +  vs->RemainLen = len;
 771 +  #endif
 772 +
 773 +  *outSizeProcessed = nowPos;
 774 +  return LZMA_RESULT_OK;
 775 +}
 776 diff -urN linux-2.6.19.old/fs/squashfs/LzmaDecode.h linux-2.6.19.dev/fs/squashfs/LzmaDecode.h
 777 --- linux-2.6.19.old/fs/squashfs/LzmaDecode.h   1970-01-01 01:00:00.000000000 +0100
 778 +++ linux-2.6.19.dev/fs/squashfs/LzmaDecode.h   2006-12-14 03:13:20.000000000 +0100
 779 @@ -0,0 +1,100 @@
 780 +/*
 781 +  LzmaDecode.h
 782 +  LZMA Decoder interface
 783 +
 784 +  LZMA SDK 4.05 Copyright (c) 1999-2004 Igor Pavlov (2004-08-25)
 785 +  http://www.7-zip.org/
 786 +
 787 +  LZMA SDK is licensed under two licenses:
 788 +  1) GNU Lesser General Public License (GNU LGPL)
 789 +  2) Common Public License (CPL)
 790 +  It means that you can select one of these two licenses and
 791 +  follow rules of that license.
 792 +
 793 +  SPECIAL EXCEPTION:
 794 +  Igor Pavlov, as the author of this code, expressly permits you to
 795 +  statically or dynamically link your code (or bind by name) to the
 796 +  interfaces of this file without subjecting your linked code to the
 797 +  terms of the CPL or GNU LGPL. Any modifications or additions
 798 +  to this file, however, are subject to the LGPL or CPL terms.
 799 +*/
 800 +
 801 +#ifndef __LZMADECODE_H
 802 +#define __LZMADECODE_H
 803 +
 804 +/* #define _LZMA_IN_CB */
 805 +/* Use callback for input data */
 806 +
 807 +/* #define _LZMA_OUT_READ */
 808 +/* Use read function for output data */
 809 +
 810 +/* #define _LZMA_PROB32 */
 811 +/* It can increase speed on some 32-bit CPUs,
 812 +   but memory usage will be doubled in that case */
 813 +
 814 +/* #define _LZMA_LOC_OPT */
 815 +/* Enable local speed optimizations inside code */
 816 +
 817 +#ifndef UInt32
 818 +#ifdef _LZMA_UINT32_IS_ULONG
 819 +#define UInt32 unsigned long
 820 +#else
 821 +#define UInt32 unsigned int
 822 +#endif
 823 +#endif
 824 +
 825 +#ifdef _LZMA_PROB32
 826 +#define CProb UInt32
 827 +#else
 828 +#define CProb unsigned short
 829 +#endif
 830 +
 831 +#define LZMA_RESULT_OK 0
 832 +#define LZMA_RESULT_DATA_ERROR 1
 833 +#define LZMA_RESULT_NOT_ENOUGH_MEM 2
 834 +
 835 +#ifdef _LZMA_IN_CB
 836 +typedef struct _ILzmaInCallback
 837 +{
 838 +  int (*Read)(void *object, unsigned char **buffer, UInt32 *bufferSize);
 839 +} ILzmaInCallback;
 840 +#endif
 841 +
 842 +#define LZMA_BASE_SIZE 1846
 843 +#define LZMA_LIT_SIZE 768
 844 +
 845 +/*
 846 +bufferSize = (LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp)))* sizeof(CProb)
 847 +bufferSize += 100 in case of _LZMA_OUT_READ
 848 +by default CProb is unsigned short,
 849 +but if specify _LZMA_PROB_32, CProb will be UInt32(unsigned int)
 850 +*/
 851 +
 852 +#ifdef _LZMA_OUT_READ
 853 +int LzmaDecoderInit(
 854 +    unsigned char *buffer, UInt32 bufferSize,
 855 +    int lc, int lp, int pb,
 856 +    unsigned char *dictionary, UInt32 dictionarySize,
 857 +  #ifdef _LZMA_IN_CB
 858 +    ILzmaInCallback *inCallback
 859 +  #else
 860 +    unsigned char *inStream, UInt32 inSize
 861 +  #endif
 862 +);
 863 +#endif
 864 +
 865 +int LzmaDecode(
 866 +    unsigned char *buffer,
 867 +  #ifndef _LZMA_OUT_READ
 868 +    UInt32 bufferSize,
 869 +    int lc, int lp, int pb,
 870 +  #ifdef _LZMA_IN_CB
 871 +    ILzmaInCallback *inCallback,
 872 +  #else
 873 +    unsigned char *inStream, UInt32 inSize,
 874 +  #endif
 875 +  #endif
 876 +    unsigned char *outStream, UInt32 outSize,
 877 +    UInt32 *outSizeProcessed);
 878 +
 879 +#endif
 880 diff -urN linux-2.6.19.old/fs/squashfs/Makefile linux-2.6.19.dev/fs/squashfs/Makefile
 881 --- linux-2.6.19.old/fs/squashfs/Makefile       2006-12-14 03:13:20.000000000 +0100
 882 +++ linux-2.6.19.dev/fs/squashfs/Makefile       2006-12-14 03:13:20.000000000 +0100
 883 @@ -5,3 +5,4 @@
 884  obj-$(CONFIG_SQUASHFS) += squashfs.o
 885  squashfs-y += inode.o
 886  squashfs-y += squashfs2_0.o
 887 +squashfs-y += LzmaDecode.o