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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 1.0.4 of 20 December 2006
12
   Copyright (C) 1996-2006 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  "1.0.4, 20-Dec-2006"
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
    s->tPos = s->tt[s->tPos];                 \
446
    cccc = (UChar)(s->tPos & 0xff);           \
447
    s->tPos >>= 8;
448
 
449
#define BZ_GET_FAST_C(cccc)                   \
450
    c_tPos = c_tt[c_tPos];                    \
451
    cccc = (UChar)(c_tPos & 0xff);            \
452
    c_tPos >>= 8;
453
 
454
#define SET_LL4(i,n)                                          \
455
   { if (((i) & 0x1) == 0)                                    \
456
        s->ll4[(i) >> 1] = (s->ll4[(i) >> 1] & 0xf0) | (n); else    \
457
        s->ll4[(i) >> 1] = (s->ll4[(i) >> 1] & 0x0f) | ((n) << 4);  \
458
   }
459
 
460
#define GET_LL4(i)                             \
461
   ((((UInt32)(s->ll4[(i) >> 1])) >> (((i) << 2) & 0x4)) & 0xF)
462
 
463
#define SET_LL(i,n)                          \
464
   { s->ll16[i] = (UInt16)(n & 0x0000ffff);  \
465
     SET_LL4(i, n >> 16);                    \
466
   }
467
 
468
#define GET_LL(i) \
469
   (((UInt32)s->ll16[i]) | (GET_LL4(i) << 16))
470
 
471
#define BZ_GET_SMALL(cccc)                            \
472
      cccc = BZ2_indexIntoF ( s->tPos, s->cftab );    \
473
      s->tPos = GET_LL(s->tPos);
474
 
475
 
476
/*-- externs for decompression. --*/
477
 
478
extern Int32
479
BZ2_indexIntoF ( Int32, Int32* );
480
 
481
extern Int32
482
BZ2_decompress ( DState* );
483
 
484
extern void
485
BZ2_hbCreateDecodeTables ( Int32*, Int32*, Int32*, UChar*,
486
                           Int32,  Int32, Int32 );
487
 
488
 
489
#endif
490
 
491
 
492
/*-- BZ_NO_STDIO seems to make NULL disappear on some platforms. --*/
493
 
494
#ifdef BZ_NO_STDIO
495
#ifndef NULL
496
#define NULL 0
497
#endif
498
#endif
499
 
500
 
501
/*-------------------------------------------------------------*/
502
/*--- end                                   bzlib_private.h ---*/
503
/*-------------------------------------------------------------*/