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

   1 diff -Nur linux-2.6.16/fs/squashfs/inode.c linux-2.6.16-owrt/fs/squashfs/inode.c
   2 --- linux-2.6.16/fs/squashfs/inode.c    2006-03-21 10:55:59.000000000 +0100
   3 +++ linux-2.6.16-owrt/fs/squashfs/inode.c       2006-03-21 12:24:37.000000000 +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 super_block *, struct kstatfs *);
  41  static int squashfs_symlink_readpage(struct file *file, struct page *page);
  42 @@ -64,7 +81,11 @@
  43                                 const char *, void *);
  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 @@ -263,6 +293,7 @@
  71                         bytes = 0;
  72                 } else
  73                         bytes = stream.total_out;
  74 +#endif
  75
  76                 up(&msblk->read_data_mutex);
  77         }
  78 @@ -2046,15 +2077,19 @@
  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                 destroy_inodecache();
  86                 err = -ENOMEM;
  87                 goto out;
  88         }
  89 +#endif
  90
  91         if ((err = register_filesystem(&squashfs_fs_type))) {
  92 +#ifndef SQUASHFS_LZMA
  93                 vfree(stream.workspace);
  94 +#endif
  95                 destroy_inodecache();
  96         }
  97
  98 @@ -2065,7 +2100,9 @@
  99
 100  static void __exit exit_squashfs_fs(void)
 101  {
 102 +#ifndef SQUASHFS_LZMA
 103         vfree(stream.workspace);
 104 +#endif
 105         unregister_filesystem(&squashfs_fs_type);
 106         destroy_inodecache();
 107  }
 108 diff -Nur linux-2.6.16/fs/squashfs/LzmaDecode.c linux-2.6.16-owrt/fs/squashfs/LzmaDecode.c
 109 --- linux-2.6.16/fs/squashfs/LzmaDecode.c       1970-01-01 01:00:00.000000000 +0100
 110 +++ linux-2.6.16-owrt/fs/squashfs/LzmaDecode.c  2006-03-21 10:56:57.000000000 +0100
 111 @@ -0,0 +1,663 @@
 112 +/*
 113 +  LzmaDecode.c
 114 +  LZMA Decoder
 115 +
 116 +  LZMA SDK 4.05 Copyright (c) 1999-2004 Igor Pavlov (2004-08-25)
 117 +  http://www.7-zip.org/
 118 +
 119 +  LZMA SDK is licensed under two licenses:
 120 +  1) GNU Lesser General Public License (GNU LGPL)
 121 +  2) Common Public License (CPL)
 122 +  It means that you can select one of these two licenses and
 123 +  follow rules of that license.
 124 +
 125 +  SPECIAL EXCEPTION:
 126 +  Igor Pavlov, as the author of this code, expressly permits you to
 127 +  statically or dynamically link your code (or bind by name) to the
 128 +  interfaces of this file without subjecting your linked code to the
 129 +  terms of the CPL or GNU LGPL. Any modifications or additions
 130 +  to this file, however, are subject to the LGPL or CPL terms.
 131 +*/
 132 +
 133 +#include "LzmaDecode.h"
 134 +
 135 +#ifndef Byte
 136 +#define Byte unsigned char
 137 +#endif
 138 +
 139 +#define kNumTopBits 24
 140 +#define kTopValue ((UInt32)1 << kNumTopBits)
 141 +
 142 +#define kNumBitModelTotalBits 11
 143 +#define kBitModelTotal (1 << kNumBitModelTotalBits)
 144 +#define kNumMoveBits 5
 145 +
 146 +typedef struct _CRangeDecoder
 147 +{
 148 +  Byte *Buffer;
 149 +  Byte *BufferLim;
 150 +  UInt32 Range;
 151 +  UInt32 Code;
 152 +  #ifdef _LZMA_IN_CB
 153 +  ILzmaInCallback *InCallback;
 154 +  int Result;
 155 +  #endif
 156 +  int ExtraBytes;
 157 +} CRangeDecoder;
 158 +
 159 +Byte RangeDecoderReadByte(CRangeDecoder *rd)
 160 +{
 161 +  if (rd->Buffer == rd->BufferLim)
 162 +  {
 163 +    #ifdef _LZMA_IN_CB
 164 +    UInt32 size;
 165 +    rd->Result = rd->InCallback->Read(rd->InCallback, &rd->Buffer, &size);
 166 +    rd->BufferLim = rd->Buffer + size;
 167 +    if (size == 0)
 168 +    #endif
 169 +    {
 170 +      rd->ExtraBytes = 1;
 171 +      return 0xFF;
 172 +    }
 173 +  }
 174 +  return (*rd->Buffer++);
 175 +}
 176 +
 177 +/* #define ReadByte (*rd->Buffer++) */
 178 +#define ReadByte (RangeDecoderReadByte(rd))
 179 +
 180 +void RangeDecoderInit(CRangeDecoder *rd,
 181 +  #ifdef _LZMA_IN_CB
 182 +    ILzmaInCallback *inCallback
 183 +  #else
 184 +    Byte *stream, UInt32 bufferSize
 185 +  #endif
 186 +    )
 187 +{
 188 +  int i;
 189 +  #ifdef _LZMA_IN_CB
 190 +  rd->InCallback = inCallback;
 191 +  rd->Buffer = rd->BufferLim = 0;
 192 +  #else
 193 +  rd->Buffer = stream;
 194 +  rd->BufferLim = stream + bufferSize;
 195 +  #endif
 196 +  rd->ExtraBytes = 0;
 197 +  rd->Code = 0;
 198 +  rd->Range = (0xFFFFFFFF);
 199 +  for(i = 0; i < 5; i++)
 200 +    rd->Code = (rd->Code << 8) | ReadByte;
 201 +}
 202 +
 203 +#define RC_INIT_VAR UInt32 range = rd->Range; UInt32 code = rd->Code;
 204 +#define RC_FLUSH_VAR rd->Range = range; rd->Code = code;
 205 +#define RC_NORMALIZE if (range < kTopValue) { range <<= 8; code = (code << 8) | ReadByte; }
 206 +
 207 +UInt32 RangeDecoderDecodeDirectBits(CRangeDecoder *rd, int numTotalBits)
 208 +{
 209 +  RC_INIT_VAR
 210 +  UInt32 result = 0;
 211 +  int i;
 212 +  for (i = numTotalBits; i > 0; i--)
 213 +  {
 214 +    /* UInt32 t; */
 215 +    range >>= 1;
 216 +
 217 +    result <<= 1;
 218 +    if (code >= range)
 219 +    {
 220 +      code -= range;
 221 +      result |= 1;
 222 +    }
 223 +    /*
 224 +    t = (code - range) >> 31;
 225 +    t &= 1;
 226 +    code -= range & (t - 1);
 227 +    result = (result + result) | (1 - t);
 228 +    */
 229 +    RC_NORMALIZE
 230 +  }
 231 +  RC_FLUSH_VAR
 232 +  return result;
 233 +}
 234 +
 235 +int RangeDecoderBitDecode(CProb *prob, CRangeDecoder *rd)
 236 +{
 237 +  UInt32 bound = (rd->Range >> kNumBitModelTotalBits) * *prob;
 238 +  if (rd->Code < bound)
 239 +  {
 240 +    rd->Range = bound;
 241 +    *prob += (kBitModelTotal - *prob) >> kNumMoveBits;
 242 +    if (rd->Range < kTopValue)
 243 +    {
 244 +      rd->Code = (rd->Code << 8) | ReadByte;
 245 +      rd->Range <<= 8;
 246 +    }
 247 +    return 0;
 248 +  }
 249 +  else
 250 +  {
 251 +    rd->Range -= bound;
 252 +    rd->Code -= bound;
 253 +    *prob -= (*prob) >> kNumMoveBits;
 254 +    if (rd->Range < kTopValue)
 255 +    {
 256 +      rd->Code = (rd->Code << 8) | ReadByte;
 257 +      rd->Range <<= 8;
 258 +    }
 259 +    return 1;
 260 +  }
 261 +}
 262 +
 263 +#define RC_GET_BIT2(prob, mi, A0, A1) \
 264 +  UInt32 bound = (range >> kNumBitModelTotalBits) * *prob; \
 265 +  if (code < bound) \
 266 +    { A0; range = bound; *prob += (kBitModelTotal - *prob) >> kNumMoveBits; mi <<= 1; } \
 267 +  else \
 268 +    { A1; range -= bound; code -= bound; *prob -= (*prob) >> kNumMoveBits; mi = (mi + mi) + 1; } \
 269 +  RC_NORMALIZE
 270 +
 271 +#define RC_GET_BIT(prob, mi) RC_GET_BIT2(prob, mi, ; , ;)
 272 +
 273 +int RangeDecoderBitTreeDecode(CProb *probs, int numLevels, CRangeDecoder *rd)
 274 +{
 275 +  int mi = 1;
 276 +  int i;
 277 +  #ifdef _LZMA_LOC_OPT
 278 +  RC_INIT_VAR
 279 +  #endif
 280 +  for(i = numLevels; i > 0; i--)
 281 +  {
 282 +    #ifdef _LZMA_LOC_OPT
 283 +    CProb *prob = probs + mi;
 284 +    RC_GET_BIT(prob, mi)
 285 +    #else
 286 +    mi = (mi + mi) + RangeDecoderBitDecode(probs + mi, rd);
 287 +    #endif
 288 +  }
 289 +  #ifdef _LZMA_LOC_OPT
 290 +  RC_FLUSH_VAR
 291 +  #endif
 292 +  return mi - (1 << numLevels);
 293 +}
 294 +
 295 +int RangeDecoderReverseBitTreeDecode(CProb *probs, int numLevels, CRangeDecoder *rd)
 296 +{
 297 +  int mi = 1;
 298 +  int i;
 299 +  int symbol = 0;
 300 +  #ifdef _LZMA_LOC_OPT
 301 +  RC_INIT_VAR
 302 +  #endif
 303 +  for(i = 0; i < numLevels; i++)
 304 +  {
 305 +    #ifdef _LZMA_LOC_OPT
 306 +    CProb *prob = probs + mi;
 307 +    RC_GET_BIT2(prob, mi, ; , symbol |= (1 << i))
 308 +    #else
 309 +    int bit = RangeDecoderBitDecode(probs + mi, rd);
 310 +    mi = mi + mi + bit;
 311 +    symbol |= (bit << i);
 312 +    #endif
 313 +  }
 314 +  #ifdef _LZMA_LOC_OPT
 315 +  RC_FLUSH_VAR
 316 +  #endif
 317 +  return symbol;
 318 +}
 319 +
 320 +Byte LzmaLiteralDecode(CProb *probs, CRangeDecoder *rd)
 321 +{
 322 +  int symbol = 1;
 323 +  #ifdef _LZMA_LOC_OPT
 324 +  RC_INIT_VAR
 325 +  #endif
 326 +  do
 327 +  {
 328 +    #ifdef _LZMA_LOC_OPT
 329 +    CProb *prob = probs + symbol;
 330 +    RC_GET_BIT(prob, symbol)
 331 +    #else
 332 +    symbol = (symbol + symbol) | RangeDecoderBitDecode(probs + symbol, rd);
 333 +    #endif
 334 +  }
 335 +  while (symbol < 0x100);
 336 +  #ifdef _LZMA_LOC_OPT
 337 +  RC_FLUSH_VAR
 338 +  #endif
 339 +  return symbol;
 340 +}
 341 +
 342 +Byte LzmaLiteralDecodeMatch(CProb *probs, CRangeDecoder *rd, Byte matchByte)
 343 +{
 344 +  int symbol = 1;
 345 +  #ifdef _LZMA_LOC_OPT
 346 +  RC_INIT_VAR
 347 +  #endif
 348 +  do
 349 +  {
 350 +    int bit;
 351 +    int matchBit = (matchByte >> 7) & 1;
 352 +    matchByte <<= 1;
 353 +    #ifdef _LZMA_LOC_OPT
 354 +    {
 355 +      CProb *prob = probs + ((1 + matchBit) << 8) + symbol;
 356 +      RC_GET_BIT2(prob, symbol, bit = 0, bit = 1)
 357 +    }
 358 +    #else
 359 +    bit = RangeDecoderBitDecode(probs + ((1 + matchBit) << 8) + symbol, rd);
 360 +    symbol = (symbol << 1) | bit;
 361 +    #endif
 362 +    if (matchBit != bit)
 363 +    {
 364 +      while (symbol < 0x100)
 365 +      {
 366 +        #ifdef _LZMA_LOC_OPT
 367 +        CProb *prob = probs + symbol;
 368 +        RC_GET_BIT(prob, symbol)
 369 +        #else
 370 +        symbol = (symbol + symbol) | RangeDecoderBitDecode(probs + symbol, rd);
 371 +        #endif
 372 +      }
 373 +      break;
 374 +    }
 375 +  }
 376 +  while (symbol < 0x100);
 377 +  #ifdef _LZMA_LOC_OPT
 378 +  RC_FLUSH_VAR
 379 +  #endif
 380 +  return symbol;
 381 +}
 382 +
 383 +#define kNumPosBitsMax 4
 384 +#define kNumPosStatesMax (1 << kNumPosBitsMax)
 385 +
 386 +#define kLenNumLowBits 3
 387 +#define kLenNumLowSymbols (1 << kLenNumLowBits)
 388 +#define kLenNumMidBits 3
 389 +#define kLenNumMidSymbols (1 << kLenNumMidBits)
 390 +#define kLenNumHighBits 8
 391 +#define kLenNumHighSymbols (1 << kLenNumHighBits)
 392 +
 393 +#define LenChoice 0
 394 +#define LenChoice2 (LenChoice + 1)
 395 +#define LenLow (LenChoice2 + 1)
 396 +#define LenMid (LenLow + (kNumPosStatesMax << kLenNumLowBits))
 397 +#define LenHigh (LenMid + (kNumPosStatesMax << kLenNumMidBits))
 398 +#define kNumLenProbs (LenHigh + kLenNumHighSymbols)
 399 +
 400 +int LzmaLenDecode(CProb *p, CRangeDecoder *rd, int posState)
 401 +{
 402 +  if(RangeDecoderBitDecode(p + LenChoice, rd) == 0)
 403 +    return RangeDecoderBitTreeDecode(p + LenLow +
 404 +        (posState << kLenNumLowBits), kLenNumLowBits, rd);
 405 +  if(RangeDecoderBitDecode(p + LenChoice2, rd) == 0)
 406 +    return kLenNumLowSymbols + RangeDecoderBitTreeDecode(p + LenMid +
 407 +        (posState << kLenNumMidBits), kLenNumMidBits, rd);
 408 +  return kLenNumLowSymbols + kLenNumMidSymbols +
 409 +      RangeDecoderBitTreeDecode(p + LenHigh, kLenNumHighBits, rd);
 410 +}
 411 +
 412 +#define kNumStates 12
 413 +
 414 +#define kStartPosModelIndex 4
 415 +#define kEndPosModelIndex 14
 416 +#define kNumFullDistances (1 << (kEndPosModelIndex >> 1))
 417 +
 418 +#define kNumPosSlotBits 6
 419 +#define kNumLenToPosStates 4
 420 +
 421 +#define kNumAlignBits 4
 422 +#define kAlignTableSize (1 << kNumAlignBits)
 423 +
 424 +#define kMatchMinLen 2
 425 +
 426 +#define IsMatch 0
 427 +#define IsRep (IsMatch + (kNumStates << kNumPosBitsMax))
 428 +#define IsRepG0 (IsRep + kNumStates)
 429 +#define IsRepG1 (IsRepG0 + kNumStates)
 430 +#define IsRepG2 (IsRepG1 + kNumStates)
 431 +#define IsRep0Long (IsRepG2 + kNumStates)
 432 +#define PosSlot (IsRep0Long + (kNumStates << kNumPosBitsMax))
 433 +#define SpecPos (PosSlot + (kNumLenToPosStates << kNumPosSlotBits))
 434 +#define Align (SpecPos + kNumFullDistances - kEndPosModelIndex)
 435 +#define LenCoder (Align + kAlignTableSize)
 436 +#define RepLenCoder (LenCoder + kNumLenProbs)
 437 +#define Literal (RepLenCoder + kNumLenProbs)
 438 +
 439 +#if Literal != LZMA_BASE_SIZE
 440 +StopCompilingDueBUG
 441 +#endif
 442 +
 443 +#ifdef _LZMA_OUT_READ
 444 +
 445 +typedef struct _LzmaVarState
 446 +{
 447 +  CRangeDecoder RangeDecoder;
 448 +  Byte *Dictionary;
 449 +  UInt32 DictionarySize;
 450 +  UInt32 DictionaryPos;
 451 +  UInt32 GlobalPos;
 452 +  UInt32 Reps[4];
 453 +  int lc;
 454 +  int lp;
 455 +  int pb;
 456 +  int State;
 457 +  int PreviousIsMatch;
 458 +  int RemainLen;
 459 +} LzmaVarState;
 460 +
 461 +int LzmaDecoderInit(
 462 +    unsigned char *buffer, UInt32 bufferSize,
 463 +    int lc, int lp, int pb,
 464 +    unsigned char *dictionary, UInt32 dictionarySize,
 465 +    #ifdef _LZMA_IN_CB
 466 +    ILzmaInCallback *inCallback
 467 +    #else
 468 +    unsigned char *inStream, UInt32 inSize
 469 +    #endif
 470 +    )
 471 +{
 472 +  LzmaVarState *vs = (LzmaVarState *)buffer;
 473 +  CProb *p = (CProb *)(buffer + sizeof(LzmaVarState));
 474 +  UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + lp));
 475 +  UInt32 i;
 476 +  if (bufferSize < numProbs * sizeof(CProb) + sizeof(LzmaVarState))
 477 +    return LZMA_RESULT_NOT_ENOUGH_MEM;
 478 +  vs->Dictionary = dictionary;
 479 +  vs->DictionarySize = dictionarySize;
 480 +  vs->DictionaryPos = 0;
 481 +  vs->GlobalPos = 0;
 482 +  vs->Reps[0] = vs->Reps[1] = vs->Reps[2] = vs->Reps[3] = 1;
 483 +  vs->lc = lc;
 484 +  vs->lp = lp;
 485 +  vs->pb = pb;
 486 +  vs->State = 0;
 487 +  vs->PreviousIsMatch = 0;
 488 +  vs->RemainLen = 0;
 489 +  dictionary[dictionarySize - 1] = 0;
 490 +  for (i = 0; i < numProbs; i++)
 491 +    p[i] = kBitModelTotal >> 1;
 492 +  RangeDecoderInit(&vs->RangeDecoder,
 493 +      #ifdef _LZMA_IN_CB
 494 +      inCallback
 495 +      #else
 496 +      inStream, inSize
 497 +      #endif
 498 +  );
 499 +  return LZMA_RESULT_OK;
 500 +}
 501 +
 502 +int LzmaDecode(unsigned char *buffer,
 503 +    unsigned char *outStream, UInt32 outSize,
 504 +    UInt32 *outSizeProcessed)
 505 +{
 506 +  LzmaVarState *vs = (LzmaVarState *)buffer;
 507 +  CProb *p = (CProb *)(buffer + sizeof(LzmaVarState));
 508 +  CRangeDecoder rd = vs->RangeDecoder;
 509 +  int state = vs->State;
 510 +  int previousIsMatch = vs->PreviousIsMatch;
 511 +  Byte previousByte;
 512 +  UInt32 rep0 = vs->Reps[0], rep1 = vs->Reps[1], rep2 = vs->Reps[2], rep3 = vs->Reps[3];
 513 +  UInt32 nowPos = 0;
 514 +  UInt32 posStateMask = (1 << (vs->pb)) - 1;
 515 +  UInt32 literalPosMask = (1 << (vs->lp)) - 1;
 516 +  int lc = vs->lc;
 517 +  int len = vs->RemainLen;
 518 +  UInt32 globalPos = vs->GlobalPos;
 519 +
 520 +  Byte *dictionary = vs->Dictionary;
 521 +  UInt32 dictionarySize = vs->DictionarySize;
 522 +  UInt32 dictionaryPos = vs->DictionaryPos;
 523 +
 524 +  if (len == -1)
 525 +  {
 526 +    *outSizeProcessed = 0;
 527 +    return LZMA_RESULT_OK;
 528 +  }
 529 +
 530 +  while(len > 0 && nowPos < outSize)
 531 +  {
 532 +    UInt32 pos = dictionaryPos - rep0;
 533 +    if (pos >= dictionarySize)
 534 +      pos += dictionarySize;
 535 +    outStream[nowPos++] = dictionary[dictionaryPos] = dictionary[pos];
 536 +    if (++dictionaryPos == dictionarySize)
 537 +      dictionaryPos = 0;
 538 +    len--;
 539 +  }
 540 +  if (dictionaryPos == 0)
 541 +    previousByte = dictionary[dictionarySize - 1];
 542 +  else
 543 +    previousByte = dictionary[dictionaryPos - 1];
 544 +#else
 545 +
 546 +int LzmaDecode(
 547 +    Byte *buffer, UInt32 bufferSize,
 548 +    int lc, int lp, int pb,
 549 +    #ifdef _LZMA_IN_CB
 550 +    ILzmaInCallback *inCallback,
 551 +    #else
 552 +    unsigned char *inStream, UInt32 inSize,
 553 +    #endif
 554 +    unsigned char *outStream, UInt32 outSize,
 555 +    UInt32 *outSizeProcessed)
 556 +{
 557 +  UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + lp));
 558 +  CProb *p = (CProb *)buffer;
 559 +  CRangeDecoder rd;
 560 +  UInt32 i;
 561 +  int state = 0;
 562 +  int previousIsMatch = 0;
 563 +  Byte previousByte = 0;
 564 +  UInt32 rep0 = 1, rep1 = 1, rep2 = 1, rep3 = 1;
 565 +  UInt32 nowPos = 0;
 566 +  UInt32 posStateMask = (1 << pb) - 1;
 567 +  UInt32 literalPosMask = (1 << lp) - 1;
 568 +  int len = 0;
 569 +  if (bufferSize < numProbs * sizeof(CProb))
 570 +    return LZMA_RESULT_NOT_ENOUGH_MEM;
 571 +  for (i = 0; i < numProbs; i++)
 572 +    p[i] = kBitModelTotal >> 1;
 573 +  RangeDecoderInit(&rd,
 574 +      #ifdef _LZMA_IN_CB
 575 +      inCallback
 576 +      #else
 577 +      inStream, inSize
 578 +      #endif
 579 +      );
 580 +#endif
 581 +
 582 +  *outSizeProcessed = 0;
 583 +  while(nowPos < outSize)
 584 +  {
 585 +    int posState = (int)(
 586 +        (nowPos
 587 +        #ifdef _LZMA_OUT_READ
 588 +        + globalPos
 589 +        #endif
 590 +        )
 591 +        & posStateMask);
 592 +    #ifdef _LZMA_IN_CB
 593 +    if (rd.Result != LZMA_RESULT_OK)
 594 +      return rd.Result;
 595 +    #endif
 596 +    if (rd.ExtraBytes != 0)
 597 +      return LZMA_RESULT_DATA_ERROR;
 598 +    if (RangeDecoderBitDecode(p + IsMatch + (state << kNumPosBitsMax) + posState, &rd) == 0)
 599 +    {
 600 +      CProb *probs = p + Literal + (LZMA_LIT_SIZE *
 601 +        (((
 602 +        (nowPos
 603 +        #ifdef _LZMA_OUT_READ
 604 +        + globalPos
 605 +        #endif
 606 +        )
 607 +        & literalPosMask) << lc) + (previousByte >> (8 - lc))));
 608 +
 609 +      if (state < 4) state = 0;
 610 +      else if (state < 10) state -= 3;
 611 +      else state -= 6;
 612 +      if (previousIsMatch)
 613 +      {
 614 +        Byte matchByte;
 615 +        #ifdef _LZMA_OUT_READ
 616 +        UInt32 pos = dictionaryPos - rep0;
 617 +        if (pos >= dictionarySize)
 618 +          pos += dictionarySize;
 619 +        matchByte = dictionary[pos];
 620 +        #else
 621 +        matchByte = outStream[nowPos - rep0];
 622 +        #endif
 623 +        previousByte = LzmaLiteralDecodeMatch(probs, &rd, matchByte);
 624 +        previousIsMatch = 0;
 625 +      }
 626 +      else
 627 +        previousByte = LzmaLiteralDecode(probs, &rd);
 628 +      outStream[nowPos++] = previousByte;
 629 +      #ifdef _LZMA_OUT_READ
 630 +      dictionary[dictionaryPos] = previousByte;
 631 +      if (++dictionaryPos == dictionarySize)
 632 +        dictionaryPos = 0;
 633 +      #endif
 634 +    }
 635 +    else
 636 +    {
 637 +      previousIsMatch = 1;
 638 +      if (RangeDecoderBitDecode(p + IsRep + state, &rd) == 1)
 639 +      {
 640 +        if (RangeDecoderBitDecode(p + IsRepG0 + state, &rd) == 0)
 641 +        {
 642 +          if (RangeDecoderBitDecode(p + IsRep0Long + (state << kNumPosBitsMax) + posState, &rd) == 0)
 643 +          {
 644 +            #ifdef _LZMA_OUT_READ
 645 +            UInt32 pos;
 646 +            #endif
 647 +            if (
 648 +               (nowPos
 649 +                #ifdef _LZMA_OUT_READ
 650 +                + globalPos
 651 +                #endif
 652 +               )
 653 +               == 0)
 654 +              return LZMA_RESULT_DATA_ERROR;
 655 +            state = state < 7 ? 9 : 11;
 656 +            #ifdef _LZMA_OUT_READ
 657 +            pos = dictionaryPos - rep0;
 658 +            if (pos >= dictionarySize)
 659 +              pos += dictionarySize;
 660 +            previousByte = dictionary[pos];
 661 +            dictionary[dictionaryPos] = previousByte;
 662 +            if (++dictionaryPos == dictionarySize)
 663 +              dictionaryPos = 0;
 664 +            #else
 665 +            previousByte = outStream[nowPos - rep0];
 666 +            #endif
 667 +            outStream[nowPos++] = previousByte;
 668 +            continue;
 669 +          }
 670 +        }
 671 +        else
 672 +        {
 673 +          UInt32 distance;
 674 +          if(RangeDecoderBitDecode(p + IsRepG1 + state, &rd) == 0)
 675 +            distance = rep1;
 676 +          else
 677 +          {
 678 +            if(RangeDecoderBitDecode(p + IsRepG2 + state, &rd) == 0)
 679 +              distance = rep2;
 680 +            else
 681 +            {
 682 +              distance = rep3;
 683 +              rep3 = rep2;
 684 +            }
 685 +            rep2 = rep1;
 686 +          }
 687 +          rep1 = rep0;
 688 +          rep0 = distance;
 689 +        }
 690 +        len = LzmaLenDecode(p + RepLenCoder, &rd, posState);
 691 +        state = state < 7 ? 8 : 11;
 692 +      }
 693 +      else
 694 +      {
 695 +        int posSlot;
 696 +        rep3 = rep2;
 697 +        rep2 = rep1;
 698 +        rep1 = rep0;
 699 +        state = state < 7 ? 7 : 10;
 700 +        len = LzmaLenDecode(p + LenCoder, &rd, posState);
 701 +        posSlot = RangeDecoderBitTreeDecode(p + PosSlot +
 702 +            ((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) <<
 703 +            kNumPosSlotBits), kNumPosSlotBits, &rd);
 704 +        if (posSlot >= kStartPosModelIndex)
 705 +        {
 706 +          int numDirectBits = ((posSlot >> 1) - 1);
 707 +          rep0 = ((2 | ((UInt32)posSlot & 1)) << numDirectBits);
 708 +          if (posSlot < kEndPosModelIndex)
 709 +          {
 710 +            rep0 += RangeDecoderReverseBitTreeDecode(
 711 +                p + SpecPos + rep0 - posSlot - 1, numDirectBits, &rd);
 712 +          }
 713 +          else
 714 +          {
 715 +            rep0 += RangeDecoderDecodeDirectBits(&rd,
 716 +                numDirectBits - kNumAlignBits) << kNumAlignBits;
 717 +            rep0 += RangeDecoderReverseBitTreeDecode(p + Align, kNumAlignBits, &rd);
 718 +          }
 719 +        }
 720 +        else
 721 +          rep0 = posSlot;
 722 +        rep0++;
 723 +      }
 724 +      if (rep0 == (UInt32)(0))
 725 +      {
 726 +        /* it's for stream version */
 727 +        len = -1;
 728 +        break;
 729 +      }
 730 +      if (rep0 > nowPos
 731 +        #ifdef _LZMA_OUT_READ
 732 +        + globalPos
 733 +        #endif
 734 +        )
 735 +      {
 736 +        return LZMA_RESULT_DATA_ERROR;
 737 +      }
 738 +      len += kMatchMinLen;
 739 +      do
 740 +      {
 741 +        #ifdef _LZMA_OUT_READ
 742 +        UInt32 pos = dictionaryPos - rep0;
 743 +        if (pos >= dictionarySize)
 744 +          pos += dictionarySize;
 745 +        previousByte = dictionary[pos];
 746 +        dictionary[dictionaryPos] = previousByte;
 747 +        if (++dictionaryPos == dictionarySize)
 748 +          dictionaryPos = 0;
 749 +        #else
 750 +        previousByte = outStream[nowPos - rep0];
 751 +        #endif
 752 +        outStream[nowPos++] = previousByte;
 753 +        len--;
 754 +      }
 755 +      while(len > 0 && nowPos < outSize);
 756 +    }
 757 +  }
 758 +
 759 +  #ifdef _LZMA_OUT_READ
 760 +  vs->RangeDecoder = rd;
 761 +  vs->DictionaryPos = dictionaryPos;
 762 +  vs->GlobalPos = globalPos + nowPos;
 763 +  vs->Reps[0] = rep0;
 764 +  vs->Reps[1] = rep1;
 765 +  vs->Reps[2] = rep2;
 766 +  vs->Reps[3] = rep3;
 767 +  vs->State = state;
 768 +  vs->PreviousIsMatch = previousIsMatch;
 769 +  vs->RemainLen = len;
 770 +  #endif
 771 +
 772 +  *outSizeProcessed = nowPos;
 773 +  return LZMA_RESULT_OK;
 774 +}
 775 diff -Nur linux-2.6.16/fs/squashfs/LzmaDecode.h linux-2.6.16-owrt/fs/squashfs/LzmaDecode.h
 776 --- linux-2.6.16/fs/squashfs/LzmaDecode.h       1970-01-01 01:00:00.000000000 +0100
 777 +++ linux-2.6.16-owrt/fs/squashfs/LzmaDecode.h  2006-03-21 10:56:57.000000000 +0100
 778 @@ -0,0 +1,100 @@
 779 +/*
 780 +  LzmaDecode.h
 781 +  LZMA Decoder interface
 782 +
 783 +  LZMA SDK 4.05 Copyright (c) 1999-2004 Igor Pavlov (2004-08-25)
 784 +  http://www.7-zip.org/
 785 +
 786 +  LZMA SDK is licensed under two licenses:
 787 +  1) GNU Lesser General Public License (GNU LGPL)
 788 +  2) Common Public License (CPL)
 789 +  It means that you can select one of these two licenses and
 790 +  follow rules of that license.
 791 +
 792 +  SPECIAL EXCEPTION:
 793 +  Igor Pavlov, as the author of this code, expressly permits you to
 794 +  statically or dynamically link your code (or bind by name) to the
 795 +  interfaces of this file without subjecting your linked code to the
 796 +  terms of the CPL or GNU LGPL. Any modifications or additions
 797 +  to this file, however, are subject to the LGPL or CPL terms.
 798 +*/
 799 +
 800 +#ifndef __LZMADECODE_H
 801 +#define __LZMADECODE_H
 802 +
 803 +/* #define _LZMA_IN_CB */
 804 +/* Use callback for input data */
 805 +
 806 +/* #define _LZMA_OUT_READ */
 807 +/* Use read function for output data */
 808 +
 809 +/* #define _LZMA_PROB32 */
 810 +/* It can increase speed on some 32-bit CPUs,
 811 +   but memory usage will be doubled in that case */
 812 +
 813 +/* #define _LZMA_LOC_OPT */
 814 +/* Enable local speed optimizations inside code */
 815 +
 816 +#ifndef UInt32
 817 +#ifdef _LZMA_UINT32_IS_ULONG
 818 +#define UInt32 unsigned long
 819 +#else
 820 +#define UInt32 unsigned int
 821 +#endif
 822 +#endif
 823 +
 824 +#ifdef _LZMA_PROB32
 825 +#define CProb UInt32
 826 +#else
 827 +#define CProb unsigned short
 828 +#endif
 829 +
 830 +#define LZMA_RESULT_OK 0
 831 +#define LZMA_RESULT_DATA_ERROR 1
 832 +#define LZMA_RESULT_NOT_ENOUGH_MEM 2
 833 +
 834 +#ifdef _LZMA_IN_CB
 835 +typedef struct _ILzmaInCallback
 836 +{
 837 +  int (*Read)(void *object, unsigned char **buffer, UInt32 *bufferSize);
 838 +} ILzmaInCallback;
 839 +#endif
 840 +
 841 +#define LZMA_BASE_SIZE 1846
 842 +#define LZMA_LIT_SIZE 768
 843 +
 844 +/*
 845 +bufferSize = (LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp)))* sizeof(CProb)
 846 +bufferSize += 100 in case of _LZMA_OUT_READ
 847 +by default CProb is unsigned short,
 848 +but if specify _LZMA_PROB_32, CProb will be UInt32(unsigned int)
 849 +*/
 850 +
 851 +#ifdef _LZMA_OUT_READ
 852 +int LzmaDecoderInit(
 853 +    unsigned char *buffer, UInt32 bufferSize,
 854 +    int lc, int lp, int pb,
 855 +    unsigned char *dictionary, UInt32 dictionarySize,
 856 +  #ifdef _LZMA_IN_CB
 857 +    ILzmaInCallback *inCallback
 858 +  #else
 859 +    unsigned char *inStream, UInt32 inSize
 860 +  #endif
 861 +);
 862 +#endif
 863 +
 864 +int LzmaDecode(
 865 +    unsigned char *buffer,
 866 +  #ifndef _LZMA_OUT_READ
 867 +    UInt32 bufferSize,
 868 +    int lc, int lp, int pb,
 869 +  #ifdef _LZMA_IN_CB
 870 +    ILzmaInCallback *inCallback,
 871 +  #else
 872 +    unsigned char *inStream, UInt32 inSize,
 873 +  #endif
 874 +  #endif
 875 +    unsigned char *outStream, UInt32 outSize,
 876 +    UInt32 *outSizeProcessed);
 877 +
 878 +#endif
 879 diff -Nur linux-2.6.16/fs/squashfs/Makefile linux-2.6.16-owrt/fs/squashfs/Makefile
 880 --- linux-2.6.16/fs/squashfs/Makefile   2006-03-21 10:55:59.000000000 +0100
 881 +++ linux-2.6.16-owrt/fs/squashfs/Makefile      2006-03-21 10:57:08.000000000 +0100
 882 @@ -5,3 +5,4 @@
 883  obj-$(CONFIG_SQUASHFS) += squashfs.o
 884  squashfs-y += inode.o
 885  squashfs-y += squashfs2_0.o
 886 +squashfs-y += LzmaDecode.o