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---
bzlib_private.h (14257B)
---
1
2 /*-------------------------------------------------------------*/
3 /*--- Private header file for the library. ---*/
4 /*--- bzlib_private.h ---*/
5 /*-------------------------------------------------------------*/
6
7 /*--
8 This file is a part of bzip2 and/or libbzip2, a program and
9 library for lossless, block-sorting data compression.
10
11 Copyright (C) 1996-2005 Julian R Seward. All rights reserved.
12
13 Redistribution and use in source and binary forms, with or without
14 modification, are permitted provided that the following conditions
15 are met:
16
17 1. Redistributions of source code must retain the above copyright
18 notice, this list of conditions and the following disclaimer.
19
20 2. The origin of this software must not be misrepresented; you must
21 not claim that you wrote the original software. If you use this
22 software in a product, an acknowledgment in the product
23 documentation would be appreciated but is not required.
24
25 3. Altered source versions must be plainly marked as such, and must
26 not be misrepresented as being the original software.
27
28 4. The name of the author may not be used to endorse or promote
29 products derived from this software without specific prior written
30 permission.
31
32 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
33 OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
34 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
35 ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
36 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
38 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
39 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
40 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
41 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
42 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
43
44 Julian Seward, Cambridge, UK.
45 jseward@bzip.org
46 bzip2/libbzip2 version 1.0 of 21 March 2000
47
48 This program is based on (at least) the work of:
49 Mike Burrows
50 David Wheeler
51 Peter Fenwick
52 Alistair Moffat
53 Radford Neal
54 Ian H. Witten
55 Robert Sedgewick
56 Jon L. Bentley
57
58 For more information on these sources, see the manual.
59 --*/
60
61
62 #ifndef _BZLIB_PRIVATE_H
63 #define _BZLIB_PRIVATE_H
64
65 #include <stdlib.h>
66
67 #ifndef BZ_NO_STDIO
68 #include <stdio.h>
69 #include <ctype.h>
70 #include <string.h>
71 #endif
72
73 #include "bzlib.h"
74
75
76
77 /*-- General stuff. --*/
78
79 #define BZ_VERSION "1.0.3, 15-Feb-2005"
80
81 typedef char Char;
82 typedef unsigned char Bool;
83 typedef unsigned char UChar;
84 typedef int Int32;
85 typedef unsigned int UInt32;
86 typedef short Int16;
87 typedef unsigned short UInt16;
88
89 #define True ((Bool)1)
90 #define False ((Bool)0)
91
92 #ifndef __GNUC__
93 #define __inline__ /* */
94 #endif
95
96 #ifndef BZ_NO_STDIO
97 extern void BZ2_bz__AssertH__fail ( int errcode );
98 #define AssertH(cond,errcode) \
99 { if (!(cond)) BZ2_bz__AssertH__fail ( errcode ); }
100 #if BZ_DEBUG
101 #define AssertD(cond,msg) \
102 { if (!(cond)) { \
103 fprintf ( stderr, \
104 "\n\nlibbzip2(debug build): internal error\n\t%s\n", msg );\
105 exit(1); \
106 }}
107 #else
108 #define AssertD(cond,msg) /* */
109 #endif
110 #define VPrintf0(zf) \
111 fprintf(stderr,zf)
112 #define VPrintf1(zf,za1) \
113 fprintf(stderr,zf,za1)
114 #define VPrintf2(zf,za1,za2) \
115 fprintf(stderr,zf,za1,za2)
116 #define VPrintf3(zf,za1,za2,za3) \
117 fprintf(stderr,zf,za1,za2,za3)
118 #define VPrintf4(zf,za1,za2,za3,za4) \
119 fprintf(stderr,zf,za1,za2,za3,za4)
120 #define VPrintf5(zf,za1,za2,za3,za4,za5) \
121 fprintf(stderr,zf,za1,za2,za3,za4,za5)
122 #else
123 extern void bz_internal_error ( int errcode );
124 #define AssertH(cond,errcode) \
125 { if (!(cond)) bz_internal_error ( errcode ); }
126 #define AssertD(cond,msg) /* */
127 #define VPrintf0(zf) /* */
128 #define VPrintf1(zf,za1) /* */
129 #define VPrintf2(zf,za1,za2) /* */
130 #define VPrintf3(zf,za1,za2,za3) /* */
131 #define VPrintf4(zf,za1,za2,za3,za4) /* */
132 #define VPrintf5(zf,za1,za2,za3,za4,za5) /* */
133 #endif
134
135
136 #define BZALLOC(nnn) (strm->bzalloc)(strm->opaque,(nnn),1)
137 #define BZFREE(ppp) (strm->bzfree)(strm->opaque,(ppp))
138
139
140 /*-- Header bytes. --*/
141
142 #define BZ_HDR_B 0x42 /* 'B' */
143 #define BZ_HDR_Z 0x5a /* 'Z' */
144 #define BZ_HDR_h 0x68 /* 'h' */
145 #define BZ_HDR_0 0x30 /* '0' */
146
147 /*-- Constants for the back end. --*/
148
149 #define BZ_MAX_ALPHA_SIZE 258
150 #define BZ_MAX_CODE_LEN 23
151
152 #define BZ_RUNA 0
153 #define BZ_RUNB 1
154
155 #define BZ_N_GROUPS 6
156 #define BZ_G_SIZE 50
157 #define BZ_N_ITERS 4
158
159 #define BZ_MAX_SELECTORS (2 + (900000 / BZ_G_SIZE))
160
161
162
163 /*-- Stuff for randomising repetitive blocks. --*/
164
165 extern Int32 BZ2_rNums[512];
166
167 #define BZ_RAND_DECLS \
168 Int32 rNToGo; \
169 Int32 rTPos \
170
171 #define BZ_RAND_INIT_MASK \
172 s->rNToGo = 0; \
173 s->rTPos = 0 \
174
175 #define BZ_RAND_MASK ((s->rNToGo == 1) ? 1 : 0)
176
177 #define BZ_RAND_UPD_MASK \
178 if (s->rNToGo == 0) { \
179 s->rNToGo = BZ2_rNums[s->rTPos]; \
180 s->rTPos++; \
181 if (s->rTPos == 512) s->rTPos = 0; \
182 } \
183 s->rNToGo--;
184
185
186
187 /*-- Stuff for doing CRCs. --*/
188
189 extern UInt32 BZ2_crc32Table[256];
190
191 #define BZ_INITIALISE_CRC(crcVar) \
192 { \
193 crcVar = 0xffffffffL; \
194 }
195
196 #define BZ_FINALISE_CRC(crcVar) \
197 { \
198 crcVar = ~(crcVar); \
199 }
200
201 #define BZ_UPDATE_CRC(crcVar,cha) \
202 { \
203 crcVar = (crcVar << 8) ^ \
204 BZ2_crc32Table[(crcVar >> 24) ^ \
205 ((UChar)cha)]; \
206 }
207
208
209
210 /*-- States and modes for compression. --*/
211
212 #define BZ_M_IDLE 1
213 #define BZ_M_RUNNING 2
214 #define BZ_M_FLUSHING 3
215 #define BZ_M_FINISHING 4
216
217 #define BZ_S_OUTPUT 1
218 #define BZ_S_INPUT 2
219
220 #define BZ_N_RADIX 2
221 #define BZ_N_QSORT 12
222 #define BZ_N_SHELL 18
223 #define BZ_N_OVERSHOOT (BZ_N_RADIX + BZ_N_QSORT + BZ_N_SHELL + 2)
224
225
226
227
228 /*-- Structure holding all the compression-side stuff. --*/
229
230 typedef
231 struct {
232 /* pointer back to the struct bz_stream */
233 bz_stream* strm;
234
235 /* mode this stream is in, and whether inputting */
236 /* or outputting data */
237 Int32 mode;
238 Int32 state;
239
240 /* remembers avail_in when flush/finish requested */
241 UInt32 avail_in_expect;
242
243 /* for doing the block sorting */
244 UInt32* arr1;
245 UInt32* arr2;
246 UInt32* ftab;
247 Int32 origPtr;
248
249 /* aliases for arr1 and arr2 */
250 UInt32* ptr;
251 UChar* block;
252 UInt16* mtfv;
253 UChar* zbits;
254
255 /* for deciding when to use the fallback sorting algorithm */
256 Int32 workFactor;
257
258 /* run-length-encoding of the input */
259 UInt32 state_in_ch;
260 Int32 state_in_len;
261 BZ_RAND_DECLS;
262
263 /* input and output limits and current posns */
264 Int32 nblock;
265 Int32 nblockMAX;
266 Int32 numZ;
267 Int32 state_out_pos;
268
269 /* map of bytes used in block */
270 Int32 nInUse;
271 Bool inUse[256];
272 UChar unseqToSeq[256];
273
274 /* the buffer for bit stream creation */
275 UInt32 bsBuff;
276 Int32 bsLive;
277
278 /* block and combined CRCs */
279 UInt32 blockCRC;
280 UInt32 combinedCRC;
281
282 /* misc administratium */
283 Int32 verbosity;
284 Int32 blockNo;
285 Int32 blockSize100k;
286
287 /* stuff for coding the MTF values */
288 Int32 nMTF;
289 Int32 mtfFreq [BZ_MAX_ALPHA_SIZE];
290 UChar selector [BZ_MAX_SELECTORS];
291 UChar selectorMtf[BZ_MAX_SELECTORS];
292
293 UChar len [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
294 Int32 code [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
295 Int32 rfreq [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
296 /* second dimension: only 3 needed; 4 makes index calculations faster */
297 UInt32 len_pack[BZ_MAX_ALPHA_SIZE][4];
298
299 }
300 EState;
301
302
303
304 /*-- externs for compression. --*/
305
306 extern void
307 BZ2_blockSort ( EState* );
308
309 extern void
310 BZ2_compressBlock ( EState*, Bool );
311
312 extern void
313 BZ2_bsInitWrite ( EState* );
314
315 extern void
316 BZ2_hbAssignCodes ( Int32*, UChar*, Int32, Int32, Int32 );
317
318 extern void
319 BZ2_hbMakeCodeLengths ( UChar*, Int32*, Int32, Int32 );
320
321
322
323 /*-- states for decompression. --*/
324
325 #define BZ_X_IDLE 1
326 #define BZ_X_OUTPUT 2
327
328 #define BZ_X_MAGIC_1 10
329 #define BZ_X_MAGIC_2 11
330 #define BZ_X_MAGIC_3 12
331 #define BZ_X_MAGIC_4 13
332 #define BZ_X_BLKHDR_1 14
333 #define BZ_X_BLKHDR_2 15
334 #define BZ_X_BLKHDR_3 16
335 #define BZ_X_BLKHDR_4 17
336 #define BZ_X_BLKHDR_5 18
337 #define BZ_X_BLKHDR_6 19
338 #define BZ_X_BCRC_1 20
339 #define BZ_X_BCRC_2 21
340 #define BZ_X_BCRC_3 22
341 #define BZ_X_BCRC_4 23
342 #define BZ_X_RANDBIT 24
343 #define BZ_X_ORIGPTR_1 25
344 #define BZ_X_ORIGPTR_2 26
345 #define BZ_X_ORIGPTR_3 27
346 #define BZ_X_MAPPING_1 28
347 #define BZ_X_MAPPING_2 29
348 #define BZ_X_SELECTOR_1 30
349 #define BZ_X_SELECTOR_2 31
350 #define BZ_X_SELECTOR_3 32
351 #define BZ_X_CODING_1 33
352 #define BZ_X_CODING_2 34
353 #define BZ_X_CODING_3 35
354 #define BZ_X_MTF_1 36
355 #define BZ_X_MTF_2 37
356 #define BZ_X_MTF_3 38
357 #define BZ_X_MTF_4 39
358 #define BZ_X_MTF_5 40
359 #define BZ_X_MTF_6 41
360 #define BZ_X_ENDHDR_2 42
361 #define BZ_X_ENDHDR_3 43
362 #define BZ_X_ENDHDR_4 44
363 #define BZ_X_ENDHDR_5 45
364 #define BZ_X_ENDHDR_6 46
365 #define BZ_X_CCRC_1 47
366 #define BZ_X_CCRC_2 48
367 #define BZ_X_CCRC_3 49
368 #define BZ_X_CCRC_4 50
369
370
371
372 /*-- Constants for the fast MTF decoder. --*/
373
374 #define MTFA_SIZE 4096
375 #define MTFL_SIZE 16
376
377
378
379 /*-- Structure holding all the decompression-side stuff. --*/
380
381 typedef
382 struct {
383 /* pointer back to the struct bz_stream */
384 bz_stream* strm;
385
386 /* state indicator for this stream */
387 Int32 state;
388
389 /* for doing the final run-length decoding */
390 UChar state_out_ch;
391 Int32 state_out_len;
392 Bool blockRandomised;
393 BZ_RAND_DECLS;
394
395 /* the buffer for bit stream reading */
396 UInt32 bsBuff;
397 Int32 bsLive;
398
399 /* misc administratium */
400 Int32 blockSize100k;
401 Bool smallDecompress;
402 Int32 currBlockNo;
403 Int32 verbosity;
404
405 /* for undoing the Burrows-Wheeler transform */
406 Int32 origPtr;
407 UInt32 tPos;
408 Int32 k0;
409 Int32 unzftab[256];
410 Int32 nblock_used;
411 Int32 cftab[257];
412 Int32 cftabCopy[257];
413
414 /* for undoing the Burrows-Wheeler transform (FAST) */
415 UInt32 *tt;
416
417 /* for undoing the Burrows-Wheeler transform (SMALL) */
418 UInt16 *ll16;
419 UChar *ll4;
420
421 /* stored and calculated CRCs */
422 UInt32 storedBlockCRC;
423 UInt32 storedCombinedCRC;
424 UInt32 calculatedBlockCRC;
425 UInt32 calculatedCombinedCRC;
426
427 /* map of bytes used in block */
428 Int32 nInUse;
429 Bool inUse[256];
430 Bool inUse16[16];
431 UChar seqToUnseq[256];
432
433 /* for decoding the MTF values */
434 UChar mtfa [MTFA_SIZE];
435 Int32 mtfbase[256 / MTFL_SIZE];
436 UChar selector [BZ_MAX_SELECTORS];
437 UChar selectorMtf[BZ_MAX_SELECTORS];
438 UChar len [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
439
440 Int32 limit [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
441 Int32 base [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
442 Int32 perm [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
443 Int32 minLens[BZ_N_GROUPS];
444
445 /* save area for scalars in the main decompress code */
446 Int32 save_i;
447 Int32 save_j;
448 Int32 save_t;
449 Int32 save_alphaSize;
450 Int32 save_nGroups;
451 Int32 save_nSelectors;
452 Int32 save_EOB;
453 Int32 save_groupNo;
454 Int32 save_groupPos;
455 Int32 save_nextSym;
456 Int32 save_nblockMAX;
457 Int32 save_nblock;
458 Int32 save_es;
459 Int32 save_N;
460 Int32 save_curr;
461 Int32 save_zt;
462 Int32 save_zn;
463 Int32 save_zvec;
464 Int32 save_zj;
465 Int32 save_gSel;
466 Int32 save_gMinlen;
467 Int32* save_gLimit;
468 Int32* save_gBase;
469 Int32* save_gPerm;
470
471 }
472 DState;
473
474
475
476 /*-- Macros for decompression. --*/
477
478 #define BZ_GET_FAST(cccc) \
479 s->tPos = s->tt[s->tPos]; \
480 cccc = (UChar)(s->tPos & 0xff); \
481 s->tPos >>= 8;
482
483 #define BZ_GET_FAST_C(cccc) \
484 c_tPos = c_tt[c_tPos]; \
485 cccc = (UChar)(c_tPos & 0xff); \
486 c_tPos >>= 8;
487
488 #define SET_LL4(i,n) \
489 { if (((i) & 0x1) == 0) \
490 s->ll4[(i) >> 1] = (s->ll4[(i) >> 1] & 0xf0) | (n); else \
491 s->ll4[(i) >> 1] = (s->ll4[(i) >> 1] & 0x0f) | ((n) << 4); \
492 }
493
494 #define GET_LL4(i) \
495 ((((UInt32)(s->ll4[(i) >> 1])) >> (((i) << 2) & 0x4)) & 0xF)
496
497 #define SET_LL(i,n) \
498 { s->ll16[i] = (UInt16)(n & 0x0000ffff); \
499 SET_LL4(i, n >> 16); \
500 }
501
502 #define GET_LL(i) \
503 (((UInt32)s->ll16[i]) | (GET_LL4(i) << 16))
504
505 #define BZ_GET_SMALL(cccc) \
506 cccc = BZ2_indexIntoF ( s->tPos, s->cftab ); \
507 s->tPos = GET_LL(s->tPos);
508
509
510 /*-- externs for decompression. --*/
511
512 extern Int32
513 BZ2_indexIntoF ( Int32, Int32* );
514
515 extern Int32
516 BZ2_decompress ( DState* );
517
518 extern void
519 BZ2_hbCreateDecodeTables ( Int32*, Int32*, Int32*, UChar*,
520 Int32, Int32, Int32 );
521
522
523 #endif
524
525
526 /*-- BZ_NO_STDIO seems to make NULL disappear on some platforms. --*/
527
528 #ifdef BZ_NO_STDIO
529 #ifndef NULL
530 #define NULL 0
531 #endif
532 #endif
533
534
535 /*-------------------------------------------------------------*/
536 /*--- end bzlib_private.h ---*/
537 /*-------------------------------------------------------------*/