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1/*
2 * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
3 * Copyright (c) 2002-2007, Professor Benoit Macq
4 * Copyright (c) 2001-2003, David Janssens
5 * Copyright (c) 2002-2003, Yannick Verschueren
6 * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
7 * Copyright (c) 2005, Herve Drolon, FreeImage Team
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "opj_includes.h"
33
34/** @defgroup MQC MQC - Implementation of an MQ-Coder */
35/*@{*/
36
37/** @name Local static functions */
38/*@{*/
39
40/**
41Output a byte, doing bit-stuffing if necessary.
42After a 0xff byte, the next byte must be smaller than 0x90.
43@param mqc MQC handle
44*/
45static void mqc_byteout(opj_mqc_t *mqc);
46/**
47Renormalize mqc->a and mqc->c while encoding, so that mqc->a stays between 0x8000 and 0x10000
48@param mqc MQC handle
49*/
50static void mqc_renorme(opj_mqc_t *mqc);
51/**
52Encode the most probable symbol
53@param mqc MQC handle
54*/
55static void mqc_codemps(opj_mqc_t *mqc);
56/**
57Encode the most least symbol
58@param mqc MQC handle
59*/
60static void mqc_codelps(opj_mqc_t *mqc);
61/**
62Fill mqc->c with 1's for flushing
63@param mqc MQC handle
64*/
65static void mqc_setbits(opj_mqc_t *mqc);
66/**
67FIXME: documentation ???
68@param mqc MQC handle
69@return
70*/
71static int mqc_mpsexchange(opj_mqc_t *mqc);
72/**
73FIXME: documentation ???
74@param mqc MQC handle
75@return
76*/
77static int mqc_lpsexchange(opj_mqc_t *mqc);
78/**
79Input a byte
80@param mqc MQC handle
81*/
82static void mqc_bytein(opj_mqc_t *mqc);
83/**
84Renormalize mqc->a and mqc->c while decoding
85@param mqc MQC handle
86*/
87static void mqc_renormd(opj_mqc_t *mqc);
88
89/*@}*/
90
91/*@}*/
92
93/* <summary> */
94/* This array defines all the possible states for a context. */
95/* </summary> */
96static opj_mqc_state_t mqc_states[47 * 2] = {
97 {0x5601, 0, &mqc_states[2], &mqc_states[3]},
98 {0x5601, 1, &mqc_states[3], &mqc_states[2]},
99 {0x3401, 0, &mqc_states[4], &mqc_states[12]},
100 {0x3401, 1, &mqc_states[5], &mqc_states[13]},
101 {0x1801, 0, &mqc_states[6], &mqc_states[18]},
102 {0x1801, 1, &mqc_states[7], &mqc_states[19]},
103 {0x0ac1, 0, &mqc_states[8], &mqc_states[24]},
104 {0x0ac1, 1, &mqc_states[9], &mqc_states[25]},
105 {0x0521, 0, &mqc_states[10], &mqc_states[58]},
106 {0x0521, 1, &mqc_states[11], &mqc_states[59]},
107 {0x0221, 0, &mqc_states[76], &mqc_states[66]},
108 {0x0221, 1, &mqc_states[77], &mqc_states[67]},
109 {0x5601, 0, &mqc_states[14], &mqc_states[13]},
110 {0x5601, 1, &mqc_states[15], &mqc_states[12]},
111 {0x5401, 0, &mqc_states[16], &mqc_states[28]},
112 {0x5401, 1, &mqc_states[17], &mqc_states[29]},
113 {0x4801, 0, &mqc_states[18], &mqc_states[28]},
114 {0x4801, 1, &mqc_states[19], &mqc_states[29]},
115 {0x3801, 0, &mqc_states[20], &mqc_states[28]},
116 {0x3801, 1, &mqc_states[21], &mqc_states[29]},
117 {0x3001, 0, &mqc_states[22], &mqc_states[34]},
118 {0x3001, 1, &mqc_states[23], &mqc_states[35]},
119 {0x2401, 0, &mqc_states[24], &mqc_states[36]},
120 {0x2401, 1, &mqc_states[25], &mqc_states[37]},
121 {0x1c01, 0, &mqc_states[26], &mqc_states[40]},
122 {0x1c01, 1, &mqc_states[27], &mqc_states[41]},
123 {0x1601, 0, &mqc_states[58], &mqc_states[42]},
124 {0x1601, 1, &mqc_states[59], &mqc_states[43]},
125 {0x5601, 0, &mqc_states[30], &mqc_states[29]},
126 {0x5601, 1, &mqc_states[31], &mqc_states[28]},
127 {0x5401, 0, &mqc_states[32], &mqc_states[28]},
128 {0x5401, 1, &mqc_states[33], &mqc_states[29]},
129 {0x5101, 0, &mqc_states[34], &mqc_states[30]},
130 {0x5101, 1, &mqc_states[35], &mqc_states[31]},
131 {0x4801, 0, &mqc_states[36], &mqc_states[32]},
132 {0x4801, 1, &mqc_states[37], &mqc_states[33]},
133 {0x3801, 0, &mqc_states[38], &mqc_states[34]},
134 {0x3801, 1, &mqc_states[39], &mqc_states[35]},
135 {0x3401, 0, &mqc_states[40], &mqc_states[36]},
136 {0x3401, 1, &mqc_states[41], &mqc_states[37]},
137 {0x3001, 0, &mqc_states[42], &mqc_states[38]},
138 {0x3001, 1, &mqc_states[43], &mqc_states[39]},
139 {0x2801, 0, &mqc_states[44], &mqc_states[38]},
140 {0x2801, 1, &mqc_states[45], &mqc_states[39]},
141 {0x2401, 0, &mqc_states[46], &mqc_states[40]},
142 {0x2401, 1, &mqc_states[47], &mqc_states[41]},
143 {0x2201, 0, &mqc_states[48], &mqc_states[42]},
144 {0x2201, 1, &mqc_states[49], &mqc_states[43]},
145 {0x1c01, 0, &mqc_states[50], &mqc_states[44]},
146 {0x1c01, 1, &mqc_states[51], &mqc_states[45]},
147 {0x1801, 0, &mqc_states[52], &mqc_states[46]},
148 {0x1801, 1, &mqc_states[53], &mqc_states[47]},
149 {0x1601, 0, &mqc_states[54], &mqc_states[48]},
150 {0x1601, 1, &mqc_states[55], &mqc_states[49]},
151 {0x1401, 0, &mqc_states[56], &mqc_states[50]},
152 {0x1401, 1, &mqc_states[57], &mqc_states[51]},
153 {0x1201, 0, &mqc_states[58], &mqc_states[52]},
154 {0x1201, 1, &mqc_states[59], &mqc_states[53]},
155 {0x1101, 0, &mqc_states[60], &mqc_states[54]},
156 {0x1101, 1, &mqc_states[61], &mqc_states[55]},
157 {0x0ac1, 0, &mqc_states[62], &mqc_states[56]},
158 {0x0ac1, 1, &mqc_states[63], &mqc_states[57]},
159 {0x09c1, 0, &mqc_states[64], &mqc_states[58]},
160 {0x09c1, 1, &mqc_states[65], &mqc_states[59]},
161 {0x08a1, 0, &mqc_states[66], &mqc_states[60]},
162 {0x08a1, 1, &mqc_states[67], &mqc_states[61]},
163 {0x0521, 0, &mqc_states[68], &mqc_states[62]},
164 {0x0521, 1, &mqc_states[69], &mqc_states[63]},
165 {0x0441, 0, &mqc_states[70], &mqc_states[64]},
166 {0x0441, 1, &mqc_states[71], &mqc_states[65]},
167 {0x02a1, 0, &mqc_states[72], &mqc_states[66]},
168 {0x02a1, 1, &mqc_states[73], &mqc_states[67]},
169 {0x0221, 0, &mqc_states[74], &mqc_states[68]},
170 {0x0221, 1, &mqc_states[75], &mqc_states[69]},
171 {0x0141, 0, &mqc_states[76], &mqc_states[70]},
172 {0x0141, 1, &mqc_states[77], &mqc_states[71]},
173 {0x0111, 0, &mqc_states[78], &mqc_states[72]},
174 {0x0111, 1, &mqc_states[79], &mqc_states[73]},
175 {0x0085, 0, &mqc_states[80], &mqc_states[74]},
176 {0x0085, 1, &mqc_states[81], &mqc_states[75]},
177 {0x0049, 0, &mqc_states[82], &mqc_states[76]},
178 {0x0049, 1, &mqc_states[83], &mqc_states[77]},
179 {0x0025, 0, &mqc_states[84], &mqc_states[78]},
180 {0x0025, 1, &mqc_states[85], &mqc_states[79]},
181 {0x0015, 0, &mqc_states[86], &mqc_states[80]},
182 {0x0015, 1, &mqc_states[87], &mqc_states[81]},
183 {0x0009, 0, &mqc_states[88], &mqc_states[82]},
184 {0x0009, 1, &mqc_states[89], &mqc_states[83]},
185 {0x0005, 0, &mqc_states[90], &mqc_states[84]},
186 {0x0005, 1, &mqc_states[91], &mqc_states[85]},
187 {0x0001, 0, &mqc_states[90], &mqc_states[86]},
188 {0x0001, 1, &mqc_states[91], &mqc_states[87]},
189 {0x5601, 0, &mqc_states[92], &mqc_states[92]},
190 {0x5601, 1, &mqc_states[93], &mqc_states[93]},
191};
192
193/*
194==========================================================
195 local functions
196==========================================================
197*/
198
199static void mqc_byteout(opj_mqc_t *mqc) {
200 if (*mqc->bp == 0xff) {
201 mqc->bp++;
202 *mqc->bp = mqc->c >> 20;
203 mqc->c &= 0xfffff;
204 mqc->ct = 7;
205 } else {
206 if ((mqc->c & 0x8000000) == 0) { /* ((mqc->c&0x8000000)==0) CHANGE */
207 mqc->bp++;
208 *mqc->bp = mqc->c >> 19;
209 mqc->c &= 0x7ffff;
210 mqc->ct = 8;
211 } else {
212 (*mqc->bp)++;
213 if (*mqc->bp == 0xff) {
214 mqc->c &= 0x7ffffff;
215 mqc->bp++;
216 *mqc->bp = mqc->c >> 20;
217 mqc->c &= 0xfffff;
218 mqc->ct = 7;
219 } else {
220 mqc->bp++;
221 *mqc->bp = mqc->c >> 19;
222 mqc->c &= 0x7ffff;
223 mqc->ct = 8;
224 }
225 }
226 }
227}
228
229static void mqc_renorme(opj_mqc_t *mqc) {
230 do {
231 mqc->a <<= 1;
232 mqc->c <<= 1;
233 mqc->ct--;
234 if (mqc->ct == 0) {
235 mqc_byteout(mqc);
236 }
237 } while ((mqc->a & 0x8000) == 0);
238}
239
240static void mqc_codemps(opj_mqc_t *mqc) {
241 mqc->a -= (*mqc->curctx)->qeval;
242 if ((mqc->a & 0x8000) == 0) {
243 if (mqc->a < (*mqc->curctx)->qeval) {
244 mqc->a = (*mqc->curctx)->qeval;
245 } else {
246 mqc->c += (*mqc->curctx)->qeval;
247 }
248 *mqc->curctx = (*mqc->curctx)->nmps;
249 mqc_renorme(mqc);
250 } else {
251 mqc->c += (*mqc->curctx)->qeval;
252 }
253}
254
255static void mqc_codelps(opj_mqc_t *mqc) {
256 mqc->a -= (*mqc->curctx)->qeval;
257 if (mqc->a < (*mqc->curctx)->qeval) {
258 mqc->c += (*mqc->curctx)->qeval;
259 } else {
260 mqc->a = (*mqc->curctx)->qeval;
261 }
262 *mqc->curctx = (*mqc->curctx)->nlps;
263 mqc_renorme(mqc);
264}
265
266static void mqc_setbits(opj_mqc_t *mqc) {
267 unsigned int tempc = mqc->c + mqc->a;
268 mqc->c |= 0xffff;
269 if (mqc->c >= tempc) {
270 mqc->c -= 0x8000;
271 }
272}
273
274static int mqc_mpsexchange(opj_mqc_t *mqc) {
275 int d;
276 if (mqc->a < (*mqc->curctx)->qeval) {
277 d = 1 - (*mqc->curctx)->mps;
278 *mqc->curctx = (*mqc->curctx)->nlps;
279 } else {
280 d = (*mqc->curctx)->mps;
281 *mqc->curctx = (*mqc->curctx)->nmps;
282 }
283
284 return d;
285}
286
287static int mqc_lpsexchange(opj_mqc_t *mqc) {
288 int d;
289 if (mqc->a < (*mqc->curctx)->qeval) {
290 mqc->a = (*mqc->curctx)->qeval;
291 d = (*mqc->curctx)->mps;
292 *mqc->curctx = (*mqc->curctx)->nmps;
293 } else {
294 mqc->a = (*mqc->curctx)->qeval;
295 d = 1 - (*mqc->curctx)->mps;
296 *mqc->curctx = (*mqc->curctx)->nlps;
297 }
298
299 return d;
300}
301
302static void mqc_bytein(opj_mqc_t *mqc) {
303 if (mqc->bp != mqc->end) {
304 unsigned int c;
305 if (mqc->bp + 1 != mqc->end) {
306 c = *(mqc->bp + 1);
307 } else {
308 c = 0xff;
309 }
310 if (*mqc->bp == 0xff) {
311 if (c > 0x8f) {
312 mqc->c += 0xff00;
313 mqc->ct = 8;
314 } else {
315 mqc->bp++;
316 mqc->c += c << 9;
317 mqc->ct = 7;
318 }
319 } else {
320 mqc->bp++;
321 mqc->c += c << 8;
322 mqc->ct = 8;
323 }
324 } else {
325 mqc->c += 0xff00;
326 mqc->ct = 8;
327 }
328}
329
330static void mqc_renormd(opj_mqc_t *mqc) {
331 do {
332 if (mqc->ct == 0) {
333 mqc_bytein(mqc);
334 }
335 mqc->a <<= 1;
336 mqc->c <<= 1;
337 mqc->ct--;
338 } while (mqc->a < 0x8000);
339}
340
341/*
342==========================================================
343 MQ-Coder interface
344==========================================================
345*/
346
347opj_mqc_t* mqc_create() {
348 opj_mqc_t *mqc = (opj_mqc_t*)opj_malloc(sizeof(opj_mqc_t));
349 return mqc;
350}
351
352void mqc_destroy(opj_mqc_t *mqc) {
353 if(mqc) {
354 opj_free(mqc);
355 }
356}
357
358int mqc_numbytes(opj_mqc_t *mqc) {
359 return mqc->bp - mqc->start;
360}
361
362void mqc_init_enc(opj_mqc_t *mqc, unsigned char *bp) {
363 mqc_setcurctx(mqc, 0);
364 mqc->a = 0x8000;
365 mqc->c = 0;
366 mqc->bp = bp - 1;
367 mqc->ct = 12;
368 if (*mqc->bp == 0xff) {
369 mqc->ct = 13;
370 }
371 mqc->start = bp;
372}
373
374void mqc_setcurctx(opj_mqc_t *mqc, int ctxno) {
375 mqc->curctx = &mqc->ctxs[ctxno];
376}
377
378void mqc_encode(opj_mqc_t *mqc, int d) {
379 if ((*mqc->curctx)->mps == d) {
380 mqc_codemps(mqc);
381 } else {
382 mqc_codelps(mqc);
383 }
384}
385
386void mqc_flush(opj_mqc_t *mqc) {
387 mqc_setbits(mqc);
388 mqc->c <<= mqc->ct;
389 mqc_byteout(mqc);
390 mqc->c <<= mqc->ct;
391 mqc_byteout(mqc);
392
393 if (*mqc->bp != 0xff) {
394 mqc->bp++;
395 }
396}
397
398void mqc_bypass_init_enc(opj_mqc_t *mqc) {
399 mqc->c = 0;
400 mqc->ct = 8;
401 /*if (*mqc->bp == 0xff) {
402 mqc->ct = 7;
403 } */
404}
405
406void mqc_bypass_enc(opj_mqc_t *mqc, int d) {
407 mqc->ct--;
408 mqc->c = mqc->c + (d << mqc->ct);
409 if (mqc->ct == 0) {
410 mqc->bp++;
411 *mqc->bp = mqc->c;
412 mqc->ct = 8;
413 if (*mqc->bp == 0xff) {
414 mqc->ct = 7;
415 }
416 mqc->c = 0;
417 }
418}
419
420int mqc_bypass_flush_enc(opj_mqc_t *mqc) {
421 unsigned char bit_padding;
422
423 bit_padding = 0;
424
425 if (mqc->ct != 0) {
426 while (mqc->ct > 0) {
427 mqc->ct--;
428 mqc->c += bit_padding << mqc->ct;
429 bit_padding = (bit_padding + 1) & 0x01;
430 }
431 mqc->bp++;
432 *mqc->bp = mqc->c;
433 mqc->ct = 8;
434 mqc->c = 0;
435 }
436
437 return 1;
438}
439
440void mqc_reset_enc(opj_mqc_t *mqc) {
441 mqc_resetstates(mqc);
442 mqc_setstate(mqc, T1_CTXNO_UNI, 0, 46);
443 mqc_setstate(mqc, T1_CTXNO_AGG, 0, 3);
444 mqc_setstate(mqc, T1_CTXNO_ZC, 0, 4);
445}
446
447int mqc_restart_enc(opj_mqc_t *mqc) {
448 int correction = 1;
449
450 /* <flush part> */
451 int n = 27 - 15 - mqc->ct;
452 mqc->c <<= mqc->ct;
453 while (n > 0) {
454 mqc_byteout(mqc);
455 n -= mqc->ct;
456 mqc->c <<= mqc->ct;
457 }
458 mqc_byteout(mqc);
459
460 return correction;
461}
462
463void mqc_restart_init_enc(opj_mqc_t *mqc) {
464 /* <Re-init part> */
465 mqc_setcurctx(mqc, 0);
466 mqc->a = 0x8000;
467 mqc->c = 0;
468 mqc->ct = 12;
469 mqc->bp--;
470 if (*mqc->bp == 0xff) {
471 mqc->ct = 13;
472 }
473}
474
475void mqc_erterm_enc(opj_mqc_t *mqc) {
476 int k = 11 - mqc->ct + 1;
477
478 while (k > 0) {
479 mqc->c <<= mqc->ct;
480 mqc->ct = 0;
481 mqc_byteout(mqc);
482 k -= mqc->ct;
483 }
484
485 if (*mqc->bp != 0xff) {
486 mqc_byteout(mqc);
487 }
488}
489
490void mqc_segmark_enc(opj_mqc_t *mqc) {
491 int i;
492 mqc_setcurctx(mqc, 18);
493
494 for (i = 1; i < 5; i++) {
495 mqc_encode(mqc, i % 2);
496 }
497}
498
499void mqc_init_dec(opj_mqc_t *mqc, unsigned char *bp, int len) {
500 mqc_setcurctx(mqc, 0);
501 mqc->start = bp;
502 mqc->end = bp + len;
503 mqc->bp = bp;
504 if (len==0) mqc->c = 0xff << 16;
505 else mqc->c = *mqc->bp << 16;
506 mqc_bytein(mqc);
507 mqc->c <<= 7;
508 mqc->ct -= 7;
509 mqc->a = 0x8000;
510}
511
512int mqc_decode(opj_mqc_t *mqc) {
513 int d;
514 mqc->a -= (*mqc->curctx)->qeval;
515 if ((mqc->c >> 16) < (*mqc->curctx)->qeval) {
516 d = mqc_lpsexchange(mqc);
517 mqc_renormd(mqc);
518 } else {
519 mqc->c -= (*mqc->curctx)->qeval << 16;
520 if ((mqc->a & 0x8000) == 0) {
521 d = mqc_mpsexchange(mqc);
522 mqc_renormd(mqc);
523 } else {
524 d = (*mqc->curctx)->mps;
525 }
526 }
527
528 return d;
529}
530
531void mqc_resetstates(opj_mqc_t *mqc) {
532 int i;
533 for (i = 0; i < MQC_NUMCTXS; i++) {
534 mqc->ctxs[i] = mqc_states;
535 }
536}
537
538void mqc_setstate(opj_mqc_t *mqc, int ctxno, int msb, int prob) {
539 mqc->ctxs[ctxno] = &mqc_states[msb + (prob << 1)];
540}
541
542
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