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Mon Sep 6 11:40:06 2010 UTC (9 years, 5 months ago) by william
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1 william 10
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     /*-------------------------------------------------------------*/

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