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 1.0.8 of 13 July 2019
12    Copyright (C) 1996-2019 Julian Seward <jseward@acm.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  "1.0.8, 13-Jul-2019"
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 const 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 const 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 /*-------------------------------------------------------------*/
510