target/linux/generic-2.6/patches-2.6.24/002-lzma_decompress.patch

   1 Index: linux-2.6.23/include/linux/LzmaDecode.h
   2 ===================================================================
   3 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
   4 +++ linux-2.6.23/include/linux/LzmaDecode.h     2007-10-10 13:51:27.000000000 +0800
   5 @@ -0,0 +1,100 @@
   6 +/*
   7 +  LzmaDecode.h
   8 +  LZMA Decoder interface
   9 +
  10 +  LZMA SDK 4.05 Copyright (c) 1999-2004 Igor Pavlov (2004-08-25)
  11 +  http://www.7-zip.org/
  12 +
  13 +  LZMA SDK is licensed under two licenses:
  14 +  1) GNU Lesser General Public License (GNU LGPL)
  15 +  2) Common Public License (CPL)
  16 +  It means that you can select one of these two licenses and
  17 +  follow rules of that license.
  18 +
  19 +  SPECIAL EXCEPTION:
  20 +  Igor Pavlov, as the author of this code, expressly permits you to
  21 +  statically or dynamically link your code (or bind by name) to the
  22 +  interfaces of this file without subjecting your linked code to the
  23 +  terms of the CPL or GNU LGPL. Any modifications or additions
  24 +  to this file, however, are subject to the LGPL or CPL terms.
  25 +*/
  26 +
  27 +#ifndef __LZMADECODE_H
  28 +#define __LZMADECODE_H
  29 +
  30 +/* #define _LZMA_IN_CB */
  31 +/* Use callback for input data */
  32 +
  33 +/* #define _LZMA_OUT_READ */
  34 +/* Use read function for output data */
  35 +
  36 +/* #define _LZMA_PROB32 */
  37 +/* It can increase speed on some 32-bit CPUs,
  38 +   but memory usage will be doubled in that case */
  39 +
  40 +/* #define _LZMA_LOC_OPT */
  41 +/* Enable local speed optimizations inside code */
  42 +
  43 +#ifndef UInt32
  44 +#ifdef _LZMA_UINT32_IS_ULONG
  45 +#define UInt32 unsigned long
  46 +#else
  47 +#define UInt32 unsigned int
  48 +#endif
  49 +#endif
  50 +
  51 +#ifdef _LZMA_PROB32
  52 +#define CProb UInt32
  53 +#else
  54 +#define CProb unsigned short
  55 +#endif
  56 +
  57 +#define LZMA_RESULT_OK 0
  58 +#define LZMA_RESULT_DATA_ERROR 1
  59 +#define LZMA_RESULT_NOT_ENOUGH_MEM 2
  60 +
  61 +#ifdef _LZMA_IN_CB
  62 +typedef struct _ILzmaInCallback
  63 +{
  64 +  int (*Read)(void *object, unsigned char **buffer, UInt32 *bufferSize);
  65 +} ILzmaInCallback;
  66 +#endif
  67 +
  68 +#define LZMA_BASE_SIZE 1846
  69 +#define LZMA_LIT_SIZE 768
  70 +
  71 +/*
  72 +bufferSize = (LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp)))* sizeof(CProb)
  73 +bufferSize += 100 in case of _LZMA_OUT_READ
  74 +by default CProb is unsigned short,
  75 +but if specify _LZMA_PROB_32, CProb will be UInt32(unsigned int)
  76 +*/
  77 +
  78 +#ifdef _LZMA_OUT_READ
  79 +int LzmaDecoderInit(
  80 +    unsigned char *buffer, UInt32 bufferSize,
  81 +    int lc, int lp, int pb,
  82 +    unsigned char *dictionary, UInt32 dictionarySize,
  83 +  #ifdef _LZMA_IN_CB
  84 +    ILzmaInCallback *inCallback
  85 +  #else
  86 +    unsigned char *inStream, UInt32 inSize
  87 +  #endif
  88 +);
  89 +#endif
  90 +
  91 +int LzmaDecode(
  92 +    unsigned char *buffer,
  93 +  #ifndef _LZMA_OUT_READ
  94 +    UInt32 bufferSize,
  95 +    int lc, int lp, int pb,
  96 +  #ifdef _LZMA_IN_CB
  97 +    ILzmaInCallback *inCallback,
  98 +  #else
  99 +    unsigned char *inStream, UInt32 inSize,
 100 +  #endif
 101 +  #endif
 102 +    unsigned char *outStream, UInt32 outSize,
 103 +    UInt32 *outSizeProcessed);
 104 +
 105 +#endif
 106 Index: linux-2.6.23/lib/LzmaDecode.c
 107 ===================================================================
 108 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
 109 +++ linux-2.6.23/lib/LzmaDecode.c       2007-10-10 13:51:27.000000000 +0800
 110 @@ -0,0 +1,663 @@
 111 +/*
 112 +  LzmaDecode.c
 113 +  LZMA Decoder
 114 +
 115 +  LZMA SDK 4.05 Copyright (c) 1999-2004 Igor Pavlov (2004-08-25)
 116 +  http://www.7-zip.org/
 117 +
 118 +  LZMA SDK is licensed under two licenses:
 119 +  1) GNU Lesser General Public License (GNU LGPL)
 120 +  2) Common Public License (CPL)
 121 +  It means that you can select one of these two licenses and
 122 +  follow rules of that license.
 123 +
 124 +  SPECIAL EXCEPTION:
 125 +  Igor Pavlov, as the author of this code, expressly permits you to
 126 +  statically or dynamically link your code (or bind by name) to the
 127 +  interfaces of this file without subjecting your linked code to the
 128 +  terms of the CPL or GNU LGPL. Any modifications or additions
 129 +  to this file, however, are subject to the LGPL or CPL terms.
 130 +*/
 131 +
 132 +#include <linux/LzmaDecode.h>
 133 +
 134 +#ifndef Byte
 135 +#define Byte unsigned char
 136 +#endif
 137 +
 138 +#define kNumTopBits 24
 139 +#define kTopValue ((UInt32)1 << kNumTopBits)
 140 +
 141 +#define kNumBitModelTotalBits 11
 142 +#define kBitModelTotal (1 << kNumBitModelTotalBits)
 143 +#define kNumMoveBits 5
 144 +
 145 +typedef struct _CRangeDecoder
 146 +{
 147 +  Byte *Buffer;
 148 +  Byte *BufferLim;
 149 +  UInt32 Range;
 150 +  UInt32 Code;
 151 +  #ifdef _LZMA_IN_CB
 152 +  ILzmaInCallback *InCallback;
 153 +  int Result;
 154 +  #endif
 155 +  int ExtraBytes;
 156 +} CRangeDecoder;
 157 +
 158 +Byte RangeDecoderReadByte(CRangeDecoder *rd)
 159 +{
 160 +  if (rd->Buffer == rd->BufferLim)
 161 +  {
 162 +    #ifdef _LZMA_IN_CB
 163 +    UInt32 size;
 164 +    rd->Result = rd->InCallback->Read(rd->InCallback, &rd->Buffer, &size);
 165 +    rd->BufferLim = rd->Buffer + size;
 166 +    if (size == 0)
 167 +    #endif
 168 +    {
 169 +      rd->ExtraBytes = 1;
 170 +      return 0xFF;
 171 +    }
 172 +  }
 173 +  return (*rd->Buffer++);
 174 +}
 175 +
 176 +/* #define ReadByte (*rd->Buffer++) */
 177 +#define ReadByte (RangeDecoderReadByte(rd))
 178 +
 179 +void RangeDecoderInit(CRangeDecoder *rd,
 180 +  #ifdef _LZMA_IN_CB
 181 +    ILzmaInCallback *inCallback
 182 +  #else
 183 +    Byte *stream, UInt32 bufferSize
 184 +  #endif
 185 +    )
 186 +{
 187 +  int i;
 188 +  #ifdef _LZMA_IN_CB
 189 +  rd->InCallback = inCallback;
 190 +  rd->Buffer = rd->BufferLim = 0;
 191 +  #else
 192 +  rd->Buffer = stream;
 193 +  rd->BufferLim = stream + bufferSize;
 194 +  #endif
 195 +  rd->ExtraBytes = 0;
 196 +  rd->Code = 0;
 197 +  rd->Range = (0xFFFFFFFF);
 198 +  for(i = 0; i < 5; i++)
 199 +    rd->Code = (rd->Code << 8) | ReadByte;
 200 +}
 201 +
 202 +#define RC_INIT_VAR UInt32 range = rd->Range; UInt32 code = rd->Code;
 203 +#define RC_FLUSH_VAR rd->Range = range; rd->Code = code;
 204 +#define RC_NORMALIZE if (range < kTopValue) { range <<= 8; code = (code << 8) | ReadByte; }
 205 +
 206 +UInt32 RangeDecoderDecodeDirectBits(CRangeDecoder *rd, int numTotalBits)
 207 +{
 208 +  RC_INIT_VAR
 209 +  UInt32 result = 0;
 210 +  int i;
 211 +  for (i = numTotalBits; i > 0; i--)
 212 +  {
 213 +    /* UInt32 t; */
 214 +    range >>= 1;
 215 +
 216 +    result <<= 1;
 217 +    if (code >= range)
 218 +    {
 219 +      code -= range;
 220 +      result |= 1;
 221 +    }
 222 +    /*
 223 +    t = (code - range) >> 31;
 224 +    t &= 1;
 225 +    code -= range & (t - 1);
 226 +    result = (result + result) | (1 - t);
 227 +    */
 228 +    RC_NORMALIZE
 229 +  }
 230 +  RC_FLUSH_VAR
 231 +  return result;
 232 +}
 233 +
 234 +int RangeDecoderBitDecode(CProb *prob, CRangeDecoder *rd)
 235 +{
 236 +  UInt32 bound = (rd->Range >> kNumBitModelTotalBits) * *prob;
 237 +  if (rd->Code < bound)
 238 +  {
 239 +    rd->Range = bound;
 240 +    *prob += (kBitModelTotal - *prob) >> kNumMoveBits;
 241 +    if (rd->Range < kTopValue)
 242 +    {
 243 +      rd->Code = (rd->Code << 8) | ReadByte;
 244 +      rd->Range <<= 8;
 245 +    }
 246 +    return 0;
 247 +  }
 248 +  else
 249 +  {
 250 +    rd->Range -= bound;
 251 +    rd->Code -= bound;
 252 +    *prob -= (*prob) >> kNumMoveBits;
 253 +    if (rd->Range < kTopValue)
 254 +    {
 255 +      rd->Code = (rd->Code << 8) | ReadByte;
 256 +      rd->Range <<= 8;
 257 +    }
 258 +    return 1;
 259 +  }
 260 +}
 261 +
 262 +#define RC_GET_BIT2(prob, mi, A0, A1) \
 263 +  UInt32 bound = (range >> kNumBitModelTotalBits) * *prob; \
 264 +  if (code < bound) \
 265 +    { A0; range = bound; *prob += (kBitModelTotal - *prob) >> kNumMoveBits; mi <<= 1; } \
 266 +  else \
 267 +    { A1; range -= bound; code -= bound; *prob -= (*prob) >> kNumMoveBits; mi = (mi + mi) + 1; } \
 268 +  RC_NORMALIZE
 269 +
 270 +#define RC_GET_BIT(prob, mi) RC_GET_BIT2(prob, mi, ; , ;)
 271 +
 272 +int RangeDecoderBitTreeDecode(CProb *probs, int numLevels, CRangeDecoder *rd)
 273 +{
 274 +  int mi = 1;
 275 +  int i;
 276 +  #ifdef _LZMA_LOC_OPT
 277 +  RC_INIT_VAR
 278 +  #endif
 279 +  for(i = numLevels; i > 0; i--)
 280 +  {
 281 +    #ifdef _LZMA_LOC_OPT
 282 +    CProb *prob = probs + mi;
 283 +    RC_GET_BIT(prob, mi)
 284 +    #else
 285 +    mi = (mi + mi) + RangeDecoderBitDecode(probs + mi, rd);
 286 +    #endif
 287 +  }
 288 +  #ifdef _LZMA_LOC_OPT
 289 +  RC_FLUSH_VAR
 290 +  #endif
 291 +  return mi - (1 << numLevels);
 292 +}
 293 +
 294 +int RangeDecoderReverseBitTreeDecode(CProb *probs, int numLevels, CRangeDecoder *rd)
 295 +{
 296 +  int mi = 1;
 297 +  int i;
 298 +  int symbol = 0;
 299 +  #ifdef _LZMA_LOC_OPT
 300 +  RC_INIT_VAR
 301 +  #endif
 302 +  for(i = 0; i < numLevels; i++)
 303 +  {
 304 +    #ifdef _LZMA_LOC_OPT
 305 +    CProb *prob = probs + mi;
 306 +    RC_GET_BIT2(prob, mi, ; , symbol |= (1 << i))
 307 +    #else
 308 +    int bit = RangeDecoderBitDecode(probs + mi, rd);
 309 +    mi = mi + mi + bit;
 310 +    symbol |= (bit << i);
 311 +    #endif
 312 +  }
 313 +  #ifdef _LZMA_LOC_OPT
 314 +  RC_FLUSH_VAR
 315 +  #endif
 316 +  return symbol;
 317 +}
 318 +
 319 +Byte LzmaLiteralDecode(CProb *probs, CRangeDecoder *rd)
 320 +{
 321 +  int symbol = 1;
 322 +  #ifdef _LZMA_LOC_OPT
 323 +  RC_INIT_VAR
 324 +  #endif
 325 +  do
 326 +  {
 327 +    #ifdef _LZMA_LOC_OPT
 328 +    CProb *prob = probs + symbol;
 329 +    RC_GET_BIT(prob, symbol)
 330 +    #else
 331 +    symbol = (symbol + symbol) | RangeDecoderBitDecode(probs + symbol, rd);
 332 +    #endif
 333 +  }
 334 +  while (symbol < 0x100);
 335 +  #ifdef _LZMA_LOC_OPT
 336 +  RC_FLUSH_VAR
 337 +  #endif
 338 +  return symbol;
 339 +}
 340 +
 341 +Byte LzmaLiteralDecodeMatch(CProb *probs, CRangeDecoder *rd, Byte matchByte)
 342 +{
 343 +  int symbol = 1;
 344 +  #ifdef _LZMA_LOC_OPT
 345 +  RC_INIT_VAR
 346 +  #endif
 347 +  do
 348 +  {
 349 +    int bit;
 350 +    int matchBit = (matchByte >> 7) & 1;
 351 +    matchByte <<= 1;
 352 +    #ifdef _LZMA_LOC_OPT
 353 +    {
 354 +      CProb *prob = probs + ((1 + matchBit) << 8) + symbol;
 355 +      RC_GET_BIT2(prob, symbol, bit = 0, bit = 1)
 356 +    }
 357 +    #else
 358 +    bit = RangeDecoderBitDecode(probs + ((1 + matchBit) << 8) + symbol, rd);
 359 +    symbol = (symbol << 1) | bit;
 360 +    #endif
 361 +    if (matchBit != bit)
 362 +    {
 363 +      while (symbol < 0x100)
 364 +      {
 365 +        #ifdef _LZMA_LOC_OPT
 366 +        CProb *prob = probs + symbol;
 367 +        RC_GET_BIT(prob, symbol)
 368 +        #else
 369 +        symbol = (symbol + symbol) | RangeDecoderBitDecode(probs + symbol, rd);
 370 +        #endif
 371 +      }
 372 +      break;
 373 +    }
 374 +  }
 375 +  while (symbol < 0x100);
 376 +  #ifdef _LZMA_LOC_OPT
 377 +  RC_FLUSH_VAR
 378 +  #endif
 379 +  return symbol;
 380 +}
 381 +
 382 +#define kNumPosBitsMax 4
 383 +#define kNumPosStatesMax (1 << kNumPosBitsMax)
 384 +
 385 +#define kLenNumLowBits 3
 386 +#define kLenNumLowSymbols (1 << kLenNumLowBits)
 387 +#define kLenNumMidBits 3
 388 +#define kLenNumMidSymbols (1 << kLenNumMidBits)
 389 +#define kLenNumHighBits 8
 390 +#define kLenNumHighSymbols (1 << kLenNumHighBits)
 391 +
 392 +#define LenChoice 0
 393 +#define LenChoice2 (LenChoice + 1)
 394 +#define LenLow (LenChoice2 + 1)
 395 +#define LenMid (LenLow + (kNumPosStatesMax << kLenNumLowBits))
 396 +#define LenHigh (LenMid + (kNumPosStatesMax << kLenNumMidBits))
 397 +#define kNumLenProbs (LenHigh + kLenNumHighSymbols)
 398 +
 399 +int LzmaLenDecode(CProb *p, CRangeDecoder *rd, int posState)
 400 +{
 401 +  if(RangeDecoderBitDecode(p + LenChoice, rd) == 0)
 402 +    return RangeDecoderBitTreeDecode(p + LenLow +
 403 +        (posState << kLenNumLowBits), kLenNumLowBits, rd);
 404 +  if(RangeDecoderBitDecode(p + LenChoice2, rd) == 0)
 405 +    return kLenNumLowSymbols + RangeDecoderBitTreeDecode(p + LenMid +
 406 +        (posState << kLenNumMidBits), kLenNumMidBits, rd);
 407 +  return kLenNumLowSymbols + kLenNumMidSymbols +
 408 +      RangeDecoderBitTreeDecode(p + LenHigh, kLenNumHighBits, rd);
 409 +}
 410 +
 411 +#define kNumStates 12
 412 +
 413 +#define kStartPosModelIndex 4
 414 +#define kEndPosModelIndex 14
 415 +#define kNumFullDistances (1 << (kEndPosModelIndex >> 1))
 416 +
 417 +#define kNumPosSlotBits 6
 418 +#define kNumLenToPosStates 4
 419 +
 420 +#define kNumAlignBits 4
 421 +#define kAlignTableSize (1 << kNumAlignBits)
 422 +
 423 +#define kMatchMinLen 2
 424 +
 425 +#define IsMatch 0
 426 +#define IsRep (IsMatch + (kNumStates << kNumPosBitsMax))
 427 +#define IsRepG0 (IsRep + kNumStates)
 428 +#define IsRepG1 (IsRepG0 + kNumStates)
 429 +#define IsRepG2 (IsRepG1 + kNumStates)
 430 +#define IsRep0Long (IsRepG2 + kNumStates)
 431 +#define PosSlot (IsRep0Long + (kNumStates << kNumPosBitsMax))
 432 +#define SpecPos (PosSlot + (kNumLenToPosStates << kNumPosSlotBits))
 433 +#define Align (SpecPos + kNumFullDistances - kEndPosModelIndex)
 434 +#define LenCoder (Align + kAlignTableSize)
 435 +#define RepLenCoder (LenCoder + kNumLenProbs)
 436 +#define Literal (RepLenCoder + kNumLenProbs)
 437 +
 438 +#if Literal != LZMA_BASE_SIZE
 439 +StopCompilingDueBUG
 440 +#endif
 441 +
 442 +#ifdef _LZMA_OUT_READ
 443 +
 444 +typedef struct _LzmaVarState
 445 +{
 446 +  CRangeDecoder RangeDecoder;
 447 +  Byte *Dictionary;
 448 +  UInt32 DictionarySize;
 449 +  UInt32 DictionaryPos;
 450 +  UInt32 GlobalPos;
 451 +  UInt32 Reps[4];
 452 +  int lc;
 453 +  int lp;
 454 +  int pb;
 455 +  int State;
 456 +  int PreviousIsMatch;
 457 +  int RemainLen;
 458 +} LzmaVarState;
 459 +
 460 +int LzmaDecoderInit(
 461 +    unsigned char *buffer, UInt32 bufferSize,
 462 +    int lc, int lp, int pb,
 463 +    unsigned char *dictionary, UInt32 dictionarySize,
 464 +    #ifdef _LZMA_IN_CB
 465 +    ILzmaInCallback *inCallback
 466 +    #else
 467 +    unsigned char *inStream, UInt32 inSize
 468 +    #endif
 469 +    )
 470 +{
 471 +  LzmaVarState *vs = (LzmaVarState *)buffer;
 472 +  CProb *p = (CProb *)(buffer + sizeof(LzmaVarState));
 473 +  UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + lp));
 474 +  UInt32 i;
 475 +  if (bufferSize < numProbs * sizeof(CProb) + sizeof(LzmaVarState))
 476 +    return LZMA_RESULT_NOT_ENOUGH_MEM;
 477 +  vs->Dictionary = dictionary;
 478 +  vs->DictionarySize = dictionarySize;
 479 +  vs->DictionaryPos = 0;
 480 +  vs->GlobalPos = 0;
 481 +  vs->Reps[0] = vs->Reps[1] = vs->Reps[2] = vs->Reps[3] = 1;
 482 +  vs->lc = lc;
 483 +  vs->lp = lp;
 484 +  vs->pb = pb;
 485 +  vs->State = 0;
 486 +  vs->PreviousIsMatch = 0;
 487 +  vs->RemainLen = 0;
 488 +  dictionary[dictionarySize - 1] = 0;
 489 +  for (i = 0; i < numProbs; i++)
 490 +    p[i] = kBitModelTotal >> 1;
 491 +  RangeDecoderInit(&vs->RangeDecoder,
 492 +      #ifdef _LZMA_IN_CB
 493 +      inCallback
 494 +      #else
 495 +      inStream, inSize
 496 +      #endif
 497 +  );
 498 +  return LZMA_RESULT_OK;
 499 +}
 500 +
 501 +int LzmaDecode(unsigned char *buffer,
 502 +    unsigned char *outStream, UInt32 outSize,
 503 +    UInt32 *outSizeProcessed)
 504 +{
 505 +  LzmaVarState *vs = (LzmaVarState *)buffer;
 506 +  CProb *p = (CProb *)(buffer + sizeof(LzmaVarState));
 507 +  CRangeDecoder rd = vs->RangeDecoder;
 508 +  int state = vs->State;
 509 +  int previousIsMatch = vs->PreviousIsMatch;
 510 +  Byte previousByte;
 511 +  UInt32 rep0 = vs->Reps[0], rep1 = vs->Reps[1], rep2 = vs->Reps[2], rep3 = vs->Reps[3];
 512 +  UInt32 nowPos = 0;
 513 +  UInt32 posStateMask = (1 << (vs->pb)) - 1;
 514 +  UInt32 literalPosMask = (1 << (vs->lp)) - 1;
 515 +  int lc = vs->lc;
 516 +  int len = vs->RemainLen;
 517 +  UInt32 globalPos = vs->GlobalPos;
 518 +
 519 +  Byte *dictionary = vs->Dictionary;
 520 +  UInt32 dictionarySize = vs->DictionarySize;
 521 +  UInt32 dictionaryPos = vs->DictionaryPos;
 522 +
 523 +  if (len == -1)
 524 +  {
 525 +    *outSizeProcessed = 0;
 526 +    return LZMA_RESULT_OK;
 527 +  }
 528 +
 529 +  while(len > 0 && nowPos < outSize)
 530 +  {
 531 +    UInt32 pos = dictionaryPos - rep0;
 532 +    if (pos >= dictionarySize)
 533 +      pos += dictionarySize;
 534 +    outStream[nowPos++] = dictionary[dictionaryPos] = dictionary[pos];
 535 +    if (++dictionaryPos == dictionarySize)
 536 +      dictionaryPos = 0;
 537 +    len--;
 538 +  }
 539 +  if (dictionaryPos == 0)
 540 +    previousByte = dictionary[dictionarySize - 1];
 541 +  else
 542 +    previousByte = dictionary[dictionaryPos - 1];
 543 +#else
 544 +
 545 +int LzmaDecode(
 546 +    Byte *buffer, UInt32 bufferSize,
 547 +    int lc, int lp, int pb,
 548 +    #ifdef _LZMA_IN_CB
 549 +    ILzmaInCallback *inCallback,
 550 +    #else
 551 +    unsigned char *inStream, UInt32 inSize,
 552 +    #endif
 553 +    unsigned char *outStream, UInt32 outSize,
 554 +    UInt32 *outSizeProcessed)
 555 +{
 556 +  UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + lp));
 557 +  CProb *p = (CProb *)buffer;
 558 +  CRangeDecoder rd;
 559 +  UInt32 i;
 560 +  int state = 0;
 561 +  int previousIsMatch = 0;
 562 +  Byte previousByte = 0;
 563 +  UInt32 rep0 = 1, rep1 = 1, rep2 = 1, rep3 = 1;
 564 +  UInt32 nowPos = 0;
 565 +  UInt32 posStateMask = (1 << pb) - 1;
 566 +  UInt32 literalPosMask = (1 << lp) - 1;
 567 +  int len = 0;
 568 +  if (bufferSize < numProbs * sizeof(CProb))
 569 +    return LZMA_RESULT_NOT_ENOUGH_MEM;
 570 +  for (i = 0; i < numProbs; i++)
 571 +    p[i] = kBitModelTotal >> 1;
 572 +  RangeDecoderInit(&rd,
 573 +      #ifdef _LZMA_IN_CB
 574 +      inCallback
 575 +      #else
 576 +      inStream, inSize
 577 +      #endif
 578 +      );
 579 +#endif
 580 +
 581 +  *outSizeProcessed = 0;
 582 +  while(nowPos < outSize)
 583 +  {
 584 +    int posState = (int)(
 585 +        (nowPos
 586 +        #ifdef _LZMA_OUT_READ
 587 +        + globalPos
 588 +        #endif
 589 +        )
 590 +        & posStateMask);
 591 +    #ifdef _LZMA_IN_CB
 592 +    if (rd.Result != LZMA_RESULT_OK)
 593 +      return rd.Result;
 594 +    #endif
 595 +    if (rd.ExtraBytes != 0)
 596 +      return LZMA_RESULT_DATA_ERROR;
 597 +    if (RangeDecoderBitDecode(p + IsMatch + (state << kNumPosBitsMax) + posState, &rd) == 0)
 598 +    {
 599 +      CProb *probs = p + Literal + (LZMA_LIT_SIZE *
 600 +        (((
 601 +        (nowPos
 602 +        #ifdef _LZMA_OUT_READ
 603 +        + globalPos
 604 +        #endif
 605 +        )
 606 +        & literalPosMask) << lc) + (previousByte >> (8 - lc))));
 607 +
 608 +      if (state < 4) state = 0;
 609 +      else if (state < 10) state -= 3;
 610 +      else state -= 6;
 611 +      if (previousIsMatch)
 612 +      {
 613 +        Byte matchByte;
 614 +        #ifdef _LZMA_OUT_READ
 615 +        UInt32 pos = dictionaryPos - rep0;
 616 +        if (pos >= dictionarySize)
 617 +          pos += dictionarySize;
 618 +        matchByte = dictionary[pos];
 619 +        #else
 620 +        matchByte = outStream[nowPos - rep0];
 621 +        #endif
 622 +        previousByte = LzmaLiteralDecodeMatch(probs, &rd, matchByte);
 623 +        previousIsMatch = 0;
 624 +      }
 625 +      else
 626 +        previousByte = LzmaLiteralDecode(probs, &rd);
 627 +      outStream[nowPos++] = previousByte;
 628 +      #ifdef _LZMA_OUT_READ
 629 +      dictionary[dictionaryPos] = previousByte;
 630 +      if (++dictionaryPos == dictionarySize)
 631 +        dictionaryPos = 0;
 632 +      #endif
 633 +    }
 634 +    else
 635 +    {
 636 +      previousIsMatch = 1;
 637 +      if (RangeDecoderBitDecode(p + IsRep + state, &rd) == 1)
 638 +      {
 639 +        if (RangeDecoderBitDecode(p + IsRepG0 + state, &rd) == 0)
 640 +        {
 641 +          if (RangeDecoderBitDecode(p + IsRep0Long + (state << kNumPosBitsMax) + posState, &rd) == 0)
 642 +          {
 643 +            #ifdef _LZMA_OUT_READ
 644 +            UInt32 pos;
 645 +            #endif
 646 +            if (
 647 +               (nowPos
 648 +                #ifdef _LZMA_OUT_READ
 649 +                + globalPos
 650 +                #endif
 651 +               )
 652 +               == 0)
 653 +              return LZMA_RESULT_DATA_ERROR;
 654 +            state = state < 7 ? 9 : 11;
 655 +            #ifdef _LZMA_OUT_READ
 656 +            pos = dictionaryPos - rep0;
 657 +            if (pos >= dictionarySize)
 658 +              pos += dictionarySize;
 659 +            previousByte = dictionary[pos];
 660 +            dictionary[dictionaryPos] = previousByte;
 661 +            if (++dictionaryPos == dictionarySize)
 662 +              dictionaryPos = 0;
 663 +            #else
 664 +            previousByte = outStream[nowPos - rep0];
 665 +            #endif
 666 +            outStream[nowPos++] = previousByte;
 667 +            continue;
 668 +          }
 669 +        }
 670 +        else
 671 +        {
 672 +          UInt32 distance;
 673 +          if(RangeDecoderBitDecode(p + IsRepG1 + state, &rd) == 0)
 674 +            distance = rep1;
 675 +          else
 676 +          {
 677 +            if(RangeDecoderBitDecode(p + IsRepG2 + state, &rd) == 0)
 678 +              distance = rep2;
 679 +            else
 680 +            {
 681 +              distance = rep3;
 682 +              rep3 = rep2;
 683 +            }
 684 +            rep2 = rep1;
 685 +          }
 686 +          rep1 = rep0;
 687 +          rep0 = distance;
 688 +        }
 689 +        len = LzmaLenDecode(p + RepLenCoder, &rd, posState);
 690 +        state = state < 7 ? 8 : 11;
 691 +      }
 692 +      else
 693 +      {
 694 +        int posSlot;
 695 +        rep3 = rep2;
 696 +        rep2 = rep1;
 697 +        rep1 = rep0;
 698 +        state = state < 7 ? 7 : 10;
 699 +        len = LzmaLenDecode(p + LenCoder, &rd, posState);
 700 +        posSlot = RangeDecoderBitTreeDecode(p + PosSlot +
 701 +            ((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) <<
 702 +            kNumPosSlotBits), kNumPosSlotBits, &rd);
 703 +        if (posSlot >= kStartPosModelIndex)
 704 +        {
 705 +          int numDirectBits = ((posSlot >> 1) - 1);
 706 +          rep0 = ((2 | ((UInt32)posSlot & 1)) << numDirectBits);
 707 +          if (posSlot < kEndPosModelIndex)
 708 +          {
 709 +            rep0 += RangeDecoderReverseBitTreeDecode(
 710 +                p + SpecPos + rep0 - posSlot - 1, numDirectBits, &rd);
 711 +          }
 712 +          else
 713 +          {
 714 +            rep0 += RangeDecoderDecodeDirectBits(&rd,
 715 +                numDirectBits - kNumAlignBits) << kNumAlignBits;
 716 +            rep0 += RangeDecoderReverseBitTreeDecode(p + Align, kNumAlignBits, &rd);
 717 +          }
 718 +        }
 719 +        else
 720 +          rep0 = posSlot;
 721 +        rep0++;
 722 +      }
 723 +      if (rep0 == (UInt32)(0))
 724 +      {
 725 +        /* it's for stream version */
 726 +        len = -1;
 727 +        break;
 728 +      }
 729 +      if (rep0 > nowPos
 730 +        #ifdef _LZMA_OUT_READ
 731 +        + globalPos
 732 +        #endif
 733 +        )
 734 +      {
 735 +        return LZMA_RESULT_DATA_ERROR;
 736 +      }
 737 +      len += kMatchMinLen;
 738 +      do
 739 +      {
 740 +        #ifdef _LZMA_OUT_READ
 741 +        UInt32 pos = dictionaryPos - rep0;
 742 +        if (pos >= dictionarySize)
 743 +          pos += dictionarySize;
 744 +        previousByte = dictionary[pos];
 745 +        dictionary[dictionaryPos] = previousByte;
 746 +        if (++dictionaryPos == dictionarySize)
 747 +          dictionaryPos = 0;
 748 +        #else
 749 +        previousByte = outStream[nowPos - rep0];
 750 +        #endif
 751 +        outStream[nowPos++] = previousByte;
 752 +        len--;
 753 +      }
 754 +      while(len > 0 && nowPos < outSize);
 755 +    }
 756 +  }
 757 +
 758 +  #ifdef _LZMA_OUT_READ
 759 +  vs->RangeDecoder = rd;
 760 +  vs->DictionaryPos = dictionaryPos;
 761 +  vs->GlobalPos = globalPos + nowPos;
 762 +  vs->Reps[0] = rep0;
 763 +  vs->Reps[1] = rep1;
 764 +  vs->Reps[2] = rep2;
 765 +  vs->Reps[3] = rep3;
 766 +  vs->State = state;
 767 +  vs->PreviousIsMatch = previousIsMatch;
 768 +  vs->RemainLen = len;
 769 +  #endif
 770 +
 771 +  *outSizeProcessed = nowPos;
 772 +  return LZMA_RESULT_OK;
 773 +}
 774 Index: linux-2.6.23/lib/Makefile
 775 ===================================================================
 776 --- linux-2.6.23.orig/lib/Makefile      2007-10-10 13:50:24.000000000 +0800
 777 +++ linux-2.6.23/lib/Makefile   2007-10-10 13:51:53.000000000 +0800
 778 @@ -13,7 +13,7 @@
 779  lib-y  += kobject.o kref.o kobject_uevent.o klist.o
 780
 781  obj-y += div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
 782 -        bust_spinlocks.o hexdump.o kasprintf.o bitmap.o
 783 +        bust_spinlocks.o hexdump.o kasprintf.o bitmap.o LzmaDecode.o
 784
 785  ifeq ($(CONFIG_DEBUG_KOBJECT),y)
 786  CFLAGS_kobject.o += -DDEBUG
 787 @@ -62,6 +62,7 @@
 788  obj-$(CONFIG_AUDIT_GENERIC) += audit.o
 789
 790  obj-$(CONFIG_SWIOTLB) += swiotlb.o
 791 +
 792  obj-$(CONFIG_FAULT_INJECTION) += fault-inject.o
 793
 794  lib-$(CONFIG_GENERIC_BUG) += bug.o