bzlib_private.h

   1
   2 /*-------------------------------------------------------------*/
   3 /*--- Private header file for the library.                  ---*/
   4 /*---                                       bzlib_private.h ---*/
   5 /*-------------------------------------------------------------*/
   6
   7 /* ------------------------------------------------------------------
   8    This file is part of bzip2/libbzip2, a program and library for
   9    lossless, block-sorting data compression.
  10
  11    bzip2/libbzip2 version 1.0.5 of 10 December 2007
  12    Copyright (C) 1996-2007 Julian Seward <jseward@bzip.org>
  13
  14    Please read the WARNING, DISCLAIMER and PATENTS sections in the
  15    README file.
  16
  17    This program is released under the terms of the license contained
  18    in the file LICENSE.
  19    ------------------------------------------------------------------ */
  20
  21
  22 #ifndef _BZLIB_PRIVATE_H
  23 #define _BZLIB_PRIVATE_H
  24
  25 #include <stdlib.h>
  26
  27 #ifndef BZ_NO_STDIO
  28 #include <stdio.h>
  29 #include <ctype.h>
  30 #include <string.h>
  31 #endif
  32
  33 #include "bzlib.h"
  34
  35
  36
  37 /*-- General stuff. --*/
  38
  39 #define BZ_VERSION  "1.0.5, 10-Dec-2007"
  40
  41 typedef char            Char;
  42 typedef unsigned char   Bool;
  43 typedef unsigned char   UChar;
  44 typedef int             Int32;
  45 typedef unsigned int    UInt32;
  46 typedef short           Int16;
  47 typedef unsigned short  UInt16;
  48
  49 #define True  ((Bool)1)
  50 #define False ((Bool)0)
  51
  52 #ifndef __GNUC__
  53 #define __inline__  /* */
  54 #endif
  55
  56 #ifndef BZ_NO_STDIO
  57
  58 extern void BZ2_bz__AssertH__fail ( int errcode );
  59 #define AssertH(cond,errcode) \
  60    { if (!(cond)) BZ2_bz__AssertH__fail ( errcode ); }
  61
  62 #if BZ_DEBUG
  63 #define AssertD(cond,msg) \
  64    { if (!(cond)) {       \
  65       fprintf ( stderr,   \
  66         "\n\nlibbzip2(debug build): internal error\n\t%s\n", msg );\
  67       exit(1); \
  68    }}
  69 #else
  70 #define AssertD(cond,msg) /* */
  71 #endif
  72
  73 #define VPrintf0(zf) \
  74    fprintf(stderr,zf)
  75 #define VPrintf1(zf,za1) \
  76    fprintf(stderr,zf,za1)
  77 #define VPrintf2(zf,za1,za2) \
  78    fprintf(stderr,zf,za1,za2)
  79 #define VPrintf3(zf,za1,za2,za3) \
  80    fprintf(stderr,zf,za1,za2,za3)
  81 #define VPrintf4(zf,za1,za2,za3,za4) \
  82    fprintf(stderr,zf,za1,za2,za3,za4)
  83 #define VPrintf5(zf,za1,za2,za3,za4,za5) \
  84    fprintf(stderr,zf,za1,za2,za3,za4,za5)
  85
  86 #else
  87
  88 extern void bz_internal_error ( int errcode );
  89 #define AssertH(cond,errcode) \
  90    { if (!(cond)) bz_internal_error ( errcode ); }
  91 #define AssertD(cond,msg)                do { } while (0)
  92 #define VPrintf0(zf)                     do { } while (0)
  93 #define VPrintf1(zf,za1)                 do { } while (0)
  94 #define VPrintf2(zf,za1,za2)             do { } while (0)
  95 #define VPrintf3(zf,za1,za2,za3)         do { } while (0)
  96 #define VPrintf4(zf,za1,za2,za3,za4)     do { } while (0)
  97 #define VPrintf5(zf,za1,za2,za3,za4,za5) do { } while (0)
  98
  99 #endif
 100
 101
 102 #define BZALLOC(nnn) (strm->bzalloc)(strm->opaque,(nnn),1)
 103 #define BZFREE(ppp)  (strm->bzfree)(strm->opaque,(ppp))
 104
 105
 106 /*-- Header bytes. --*/
 107
 108 #define BZ_HDR_B 0x42   /* 'B' */
 109 #define BZ_HDR_Z 0x5a   /* 'Z' */
 110 #define BZ_HDR_h 0x68   /* 'h' */
 111 #define BZ_HDR_0 0x30   /* '0' */
 112
 113 /*-- Constants for the back end. --*/
 114
 115 #define BZ_MAX_ALPHA_SIZE 258
 116 #define BZ_MAX_CODE_LEN    23
 117
 118 #define BZ_RUNA 0
 119 #define BZ_RUNB 1
 120
 121 #define BZ_N_GROUPS 6
 122 #define BZ_G_SIZE   50
 123 #define BZ_N_ITERS  4
 124
 125 #define BZ_MAX_SELECTORS (2 + (900000 / BZ_G_SIZE))
 126
 127
 128
 129 /*-- Stuff for randomising repetitive blocks. --*/
 130
 131 extern Int32 BZ2_rNums[512];
 132
 133 #define BZ_RAND_DECLS                          \
 134    Int32 rNToGo;                               \
 135    Int32 rTPos                                 \
 136
 137 #define BZ_RAND_INIT_MASK                      \
 138    s->rNToGo = 0;                              \
 139    s->rTPos  = 0                               \
 140
 141 #define BZ_RAND_MASK ((s->rNToGo == 1) ? 1 : 0)
 142
 143 #define BZ_RAND_UPD_MASK                       \
 144    if (s->rNToGo == 0) {                       \
 145       s->rNToGo = BZ2_rNums[s->rTPos];         \
 146       s->rTPos++;                              \
 147       if (s->rTPos == 512) s->rTPos = 0;       \
 148    }                                           \
 149    s->rNToGo--;
 150
 151
 152
 153 /*-- Stuff for doing CRCs. --*/
 154
 155 extern UInt32 BZ2_crc32Table[256];
 156
 157 #define BZ_INITIALISE_CRC(crcVar)              \
 158 {                                              \
 159    crcVar = 0xffffffffL;                       \
 160 }
 161
 162 #define BZ_FINALISE_CRC(crcVar)                \
 163 {                                              \
 164    crcVar = ~(crcVar);                         \
 165 }
 166
 167 #define BZ_UPDATE_CRC(crcVar,cha)              \
 168 {                                              \
 169    crcVar = (crcVar << 8) ^                    \
 170             BZ2_crc32Table[(crcVar >> 24) ^    \
 171                            ((UChar)cha)];      \
 172 }
 173
 174
 175
 176 /*-- States and modes for compression. --*/
 177
 178 #define BZ_M_IDLE      1
 179 #define BZ_M_RUNNING   2
 180 #define BZ_M_FLUSHING  3
 181 #define BZ_M_FINISHING 4
 182
 183 #define BZ_S_OUTPUT    1
 184 #define BZ_S_INPUT     2
 185
 186 #define BZ_N_RADIX 2
 187 #define BZ_N_QSORT 12
 188 #define BZ_N_SHELL 18
 189 #define BZ_N_OVERSHOOT (BZ_N_RADIX + BZ_N_QSORT + BZ_N_SHELL + 2)
 190
 191
 192
 193
 194 /*-- Structure holding all the compression-side stuff. --*/
 195
 196 typedef
 197    struct {
 198       /* pointer back to the struct bz_stream */
 199       bz_stream* strm;
 200
 201       /* mode this stream is in, and whether inputting */
 202       /* or outputting data */
 203       Int32    mode;
 204       Int32    state;
 205
 206       /* remembers avail_in when flush/finish requested */
 207       UInt32   avail_in_expect;
 208
 209       /* for doing the block sorting */
 210       UInt32*  arr1;
 211       UInt32*  arr2;
 212       UInt32*  ftab;
 213       Int32    origPtr;
 214
 215       /* aliases for arr1 and arr2 */
 216       UInt32*  ptr;
 217       UChar*   block;
 218       UInt16*  mtfv;
 219       UChar*   zbits;
 220
 221       /* for deciding when to use the fallback sorting algorithm */
 222       Int32    workFactor;
 223
 224       /* run-length-encoding of the input */
 225       UInt32   state_in_ch;
 226       Int32    state_in_len;
 227       BZ_RAND_DECLS;
 228
 229       /* input and output limits and current posns */
 230       Int32    nblock;
 231       Int32    nblockMAX;
 232       Int32    numZ;
 233       Int32    state_out_pos;
 234
 235       /* map of bytes used in block */
 236       Int32    nInUse;
 237       Bool     inUse[256];
 238       UChar    unseqToSeq[256];
 239
 240       /* the buffer for bit stream creation */
 241       UInt32   bsBuff;
 242       Int32    bsLive;
 243
 244       /* block and combined CRCs */
 245       UInt32   blockCRC;
 246       UInt32   combinedCRC;
 247
 248       /* misc administratium */
 249       Int32    verbosity;
 250       Int32    blockNo;
 251       Int32    blockSize100k;
 252
 253       /* stuff for coding the MTF values */
 254       Int32    nMTF;
 255       Int32    mtfFreq    [BZ_MAX_ALPHA_SIZE];
 256       UChar    selector   [BZ_MAX_SELECTORS];
 257       UChar    selectorMtf[BZ_MAX_SELECTORS];
 258
 259       UChar    len     [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
 260       Int32    code    [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
 261       Int32    rfreq   [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
 262       /* second dimension: only 3 needed; 4 makes index calculations faster */
 263       UInt32   len_pack[BZ_MAX_ALPHA_SIZE][4];
 264
 265    }
 266    EState;
 267
 268
 269
 270 /*-- externs for compression. --*/
 271
 272 extern void
 273 BZ2_blockSort ( EState* );
 274
 275 extern void
 276 BZ2_compressBlock ( EState*, Bool );
 277
 278 extern void
 279 BZ2_bsInitWrite ( EState* );
 280
 281 extern void
 282 BZ2_hbAssignCodes ( Int32*, UChar*, Int32, Int32, Int32 );
 283
 284 extern void
 285 BZ2_hbMakeCodeLengths ( UChar*, Int32*, Int32, Int32 );
 286
 287
 288
 289 /*-- states for decompression. --*/
 290
 291 #define BZ_X_IDLE        1
 292 #define BZ_X_OUTPUT      2
 293
 294 #define BZ_X_MAGIC_1     10
 295 #define BZ_X_MAGIC_2     11
 296 #define BZ_X_MAGIC_3     12
 297 #define BZ_X_MAGIC_4     13
 298 #define BZ_X_BLKHDR_1    14
 299 #define BZ_X_BLKHDR_2    15
 300 #define BZ_X_BLKHDR_3    16
 301 #define BZ_X_BLKHDR_4    17
 302 #define BZ_X_BLKHDR_5    18
 303 #define BZ_X_BLKHDR_6    19
 304 #define BZ_X_BCRC_1      20
 305 #define BZ_X_BCRC_2      21
 306 #define BZ_X_BCRC_3      22
 307 #define BZ_X_BCRC_4      23
 308 #define BZ_X_RANDBIT     24
 309 #define BZ_X_ORIGPTR_1   25
 310 #define BZ_X_ORIGPTR_2   26
 311 #define BZ_X_ORIGPTR_3   27
 312 #define BZ_X_MAPPING_1   28
 313 #define BZ_X_MAPPING_2   29
 314 #define BZ_X_SELECTOR_1  30
 315 #define BZ_X_SELECTOR_2  31
 316 #define BZ_X_SELECTOR_3  32
 317 #define BZ_X_CODING_1    33
 318 #define BZ_X_CODING_2    34
 319 #define BZ_X_CODING_3    35
 320 #define BZ_X_MTF_1       36
 321 #define BZ_X_MTF_2       37
 322 #define BZ_X_MTF_3       38
 323 #define BZ_X_MTF_4       39
 324 #define BZ_X_MTF_5       40
 325 #define BZ_X_MTF_6       41
 326 #define BZ_X_ENDHDR_2    42
 327 #define BZ_X_ENDHDR_3    43
 328 #define BZ_X_ENDHDR_4    44
 329 #define BZ_X_ENDHDR_5    45
 330 #define BZ_X_ENDHDR_6    46
 331 #define BZ_X_CCRC_1      47
 332 #define BZ_X_CCRC_2      48
 333 #define BZ_X_CCRC_3      49
 334 #define BZ_X_CCRC_4      50
 335
 336
 337
 338 /*-- Constants for the fast MTF decoder. --*/
 339
 340 #define MTFA_SIZE 4096
 341 #define MTFL_SIZE 16
 342
 343
 344
 345 /*-- Structure holding all the decompression-side stuff. --*/
 346
 347 typedef
 348    struct {
 349       /* pointer back to the struct bz_stream */
 350       bz_stream* strm;
 351
 352       /* state indicator for this stream */
 353       Int32    state;
 354
 355       /* for doing the final run-length decoding */
 356       UChar    state_out_ch;
 357       Int32    state_out_len;
 358       Bool     blockRandomised;
 359       BZ_RAND_DECLS;
 360
 361       /* the buffer for bit stream reading */
 362       UInt32   bsBuff;
 363       Int32    bsLive;
 364
 365       /* misc administratium */
 366       Int32    blockSize100k;
 367       Bool     smallDecompress;
 368       Int32    currBlockNo;
 369       Int32    verbosity;
 370
 371       /* for undoing the Burrows-Wheeler transform */
 372       Int32    origPtr;
 373       UInt32   tPos;
 374       Int32    k0;
 375       Int32    unzftab[256];
 376       Int32    nblock_used;
 377       Int32    cftab[257];
 378       Int32    cftabCopy[257];
 379
 380       /* for undoing the Burrows-Wheeler transform (FAST) */
 381       UInt32   *tt;
 382
 383       /* for undoing the Burrows-Wheeler transform (SMALL) */
 384       UInt16   *ll16;
 385       UChar    *ll4;
 386
 387       /* stored and calculated CRCs */
 388       UInt32   storedBlockCRC;
 389       UInt32   storedCombinedCRC;
 390       UInt32   calculatedBlockCRC;
 391       UInt32   calculatedCombinedCRC;
 392
 393       /* map of bytes used in block */
 394       Int32    nInUse;
 395       Bool     inUse[256];
 396       Bool     inUse16[16];
 397       UChar    seqToUnseq[256];
 398
 399       /* for decoding the MTF values */
 400       UChar    mtfa   [MTFA_SIZE];
 401       Int32    mtfbase[256 / MTFL_SIZE];
 402       UChar    selector   [BZ_MAX_SELECTORS];
 403       UChar    selectorMtf[BZ_MAX_SELECTORS];
 404       UChar    len  [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
 405
 406       Int32    limit  [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
 407       Int32    base   [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
 408       Int32    perm   [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
 409       Int32    minLens[BZ_N_GROUPS];
 410
 411       /* save area for scalars in the main decompress code */
 412       Int32    save_i;
 413       Int32    save_j;
 414       Int32    save_t;
 415       Int32    save_alphaSize;
 416       Int32    save_nGroups;
 417       Int32    save_nSelectors;
 418       Int32    save_EOB;
 419       Int32    save_groupNo;
 420       Int32    save_groupPos;
 421       Int32    save_nextSym;
 422       Int32    save_nblockMAX;
 423       Int32    save_nblock;
 424       Int32    save_es;
 425       Int32    save_N;
 426       Int32    save_curr;
 427       Int32    save_zt;
 428       Int32    save_zn;
 429       Int32    save_zvec;
 430       Int32    save_zj;
 431       Int32    save_gSel;
 432       Int32    save_gMinlen;
 433       Int32*   save_gLimit;
 434       Int32*   save_gBase;
 435       Int32*   save_gPerm;
 436
 437    }
 438    DState;
 439
 440
 441
 442 /*-- Macros for decompression. --*/
 443
 444 #define BZ_GET_FAST(cccc)                     \
 445     /* c_tPos is unsigned, hence test < 0 is pointless. */ \
 446     if (s->tPos >= (UInt32)100000 * (UInt32)s->blockSize100k) return True; \
 447     s->tPos = s->tt[s->tPos];                 \
 448     cccc = (UChar)(s->tPos & 0xff);           \
 449     s->tPos >>= 8;
 450
 451 #define BZ_GET_FAST_C(cccc)                   \
 452     /* c_tPos is unsigned, hence test < 0 is pointless. */ \
 453     if (c_tPos >= (UInt32)100000 * (UInt32)ro_blockSize100k) return True; \
 454     c_tPos = c_tt[c_tPos];                    \
 455     cccc = (UChar)(c_tPos & 0xff);            \
 456     c_tPos >>= 8;
 457
 458 #define SET_LL4(i,n)                                          \
 459    { if (((i) & 0x1) == 0)                                    \
 460         s->ll4[(i) >> 1] = (s->ll4[(i) >> 1] & 0xf0) | (n); else    \
 461         s->ll4[(i) >> 1] = (s->ll4[(i) >> 1] & 0x0f) | ((n) << 4);  \
 462    }
 463
 464 #define GET_LL4(i)                             \
 465    ((((UInt32)(s->ll4[(i) >> 1])) >> (((i) << 2) & 0x4)) & 0xF)
 466
 467 #define SET_LL(i,n)                          \
 468    { s->ll16[i] = (UInt16)(n & 0x0000ffff);  \
 469      SET_LL4(i, n >> 16);                    \
 470    }
 471
 472 #define GET_LL(i) \
 473    (((UInt32)s->ll16[i]) | (GET_LL4(i) << 16))
 474
 475 #define BZ_GET_SMALL(cccc)                            \
 476     /* c_tPos is unsigned, hence test < 0 is pointless. */ \
 477     if (s->tPos >= (UInt32)100000 * (UInt32)s->blockSize100k) return True; \
 478     cccc = BZ2_indexIntoF ( s->tPos, s->cftab );    \
 479     s->tPos = GET_LL(s->tPos);
 480
 481
 482 /*-- externs for decompression. --*/
 483
 484 extern Int32
 485 BZ2_indexIntoF ( Int32, Int32* );
 486
 487 extern Int32
 488 BZ2_decompress ( DState* );
 489
 490 extern void
 491 BZ2_hbCreateDecodeTables ( Int32*, Int32*, Int32*, UChar*,
 492                            Int32,  Int32, Int32 );
 493
 494
 495 #endif
 496
 497
 498 /*-- BZ_NO_STDIO seems to make NULL disappear on some platforms. --*/
 499
 500 #ifdef BZ_NO_STDIO
 501 #ifndef NULL
 502 #define NULL 0
 503 #endif
 504 #endif
 505
 506
 507 /*-------------------------------------------------------------*/
 508 /*--- end                                   bzlib_private.h ---*/
 509 /*-------------------------------------------------------------*/