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jdphuff.c
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1 /*
2  * jdphuff.c
3  *
4  * Copyright (C) 1995, Thomas G. Lane.
5  * This file is part of the Independent JPEG Group's software.
6  * For conditions of distribution and use, see the accompanying README file.
7  *
8  * This file contains Huffman entropy decoding routines for progressive JPEG.
9  *
10  * Much of the complexity here has to do with supporting input suspension.
11  * If the data source module demands suspension, we want to be able to back
12  * up to the start of the current MCU. To do this, we copy state variables
13  * into local working storage, and update them back to the permanent
14  * storage only upon successful completion of an MCU.
15  */
16 
17 #define JPEG_INTERNALS
18 #include "jinclude.h"
19 #include "jpeglib.h"
20 #include "jdhuff.h" /* Declarations shared with jdhuff.c */
21 
22 
23 #ifdef D_PROGRESSIVE_SUPPORTED
24 
25 /*
26  * Expanded entropy decoder object for progressive Huffman decoding.
27  *
28  * The savable_state subrecord contains fields that change within an MCU,
29  * but must not be updated permanently until we complete the MCU.
30  */
31 
32 typedef struct {
33  unsigned int EOBRUN; /* remaining EOBs in EOBRUN */
34  int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */
36 
37 /* This macro is to work around compilers with missing or broken
38  * structure assignment. You'll need to fix this code if you have
39  * such a compiler and you change MAX_COMPS_IN_SCAN.
40  */
41 
42 #ifndef NO_STRUCT_ASSIGN
43 #define ASSIGN_STATE(dest,src) ((dest) = (src))
44 #else
45 #if MAX_COMPS_IN_SCAN == 4
46 #define ASSIGN_STATE(dest,src) \
47  ((dest).EOBRUN = (src).EOBRUN, \
48  (dest).last_dc_val[0] = (src).last_dc_val[0], \
49  (dest).last_dc_val[1] = (src).last_dc_val[1], \
50  (dest).last_dc_val[2] = (src).last_dc_val[2], \
51  (dest).last_dc_val[3] = (src).last_dc_val[3])
52 #endif
53 #endif
54 
55 
56 typedef struct {
57  struct jpeg_entropy_decoder pub; /* public fields */
58 
59  /* These fields are loaded into local variables at start of each MCU.
60  * In case of suspension, we exit WITHOUT updating them.
61  */
62  bitread_perm_state bitstate; /* Bit buffer at start of MCU */
63  savable_state saved; /* Other state at start of MCU */
64 
65  /* These fields are NOT loaded into local working state. */
66  unsigned int restarts_to_go; /* MCUs left in this restart interval */
67 
68  /* Pointers to derived tables (these workspaces have image lifespan) */
69  d_derived_tbl * derived_tbls[NUM_HUFF_TBLS];
70 
71  d_derived_tbl * ac_derived_tbl; /* active table during an AC scan */
72 } phuff_entropy_decoder;
73 
74 typedef phuff_entropy_decoder * phuff_entropy_ptr;
75 
76 /* Forward declarations */
77 METHODDEF boolean decode_mcu_DC_first JPP((j_decompress_ptr cinfo,
78  JBLOCKROW *MCU_data));
79 METHODDEF boolean decode_mcu_AC_first JPP((j_decompress_ptr cinfo,
80  JBLOCKROW *MCU_data));
81 METHODDEF boolean decode_mcu_DC_refine JPP((j_decompress_ptr cinfo,
82  JBLOCKROW *MCU_data));
83 METHODDEF boolean decode_mcu_AC_refine JPP((j_decompress_ptr cinfo,
84  JBLOCKROW *MCU_data));
85 
86 
87 /*
88  * Initialize for a Huffman-compressed scan.
89  */
90 
91 METHODDEF void
92 start_pass_phuff_decoder (j_decompress_ptr cinfo)
93 {
94  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
95  boolean is_DC_band, bad;
96  int ci, coefi, tbl;
97  int *coef_bit_ptr;
98  jpeg_component_info * compptr;
99 
100  is_DC_band = (cinfo->Ss == 0);
101 
102  /* Validate scan parameters */
103  bad = FALSE;
104  if (is_DC_band) {
105  if (cinfo->Se != 0)
106  bad = TRUE;
107  } else {
108  /* need not check Ss/Se < 0 since they came from unsigned bytes */
109  if (cinfo->Ss > cinfo->Se || cinfo->Se >= DCTSIZE2)
110  bad = TRUE;
111  /* AC scans may have only one component */
112  if (cinfo->comps_in_scan != 1)
113  bad = TRUE;
114  }
115  if (cinfo->Ah != 0) {
116  /* Successive approximation refinement scan: must have Al = Ah-1. */
117  if (cinfo->Al != cinfo->Ah-1)
118  bad = TRUE;
119  }
120  if (cinfo->Al > 13) /* need not check for < 0 */
121  bad = TRUE;
122  if (bad)
123  ERREXIT4(cinfo, JERR_BAD_PROGRESSION,
124  cinfo->Ss, cinfo->Se, cinfo->Ah, cinfo->Al);
125  /* Update progression status, and verify that scan order is legal.
126  * Note that inter-scan inconsistencies are treated as warnings
127  * not fatal errors ... not clear if this is right way to behave.
128  */
129  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
130  int cindex = cinfo->cur_comp_info[ci]->component_index;
131  coef_bit_ptr = & cinfo->coef_bits[cindex][0];
132  if (!is_DC_band && coef_bit_ptr[0] < 0) /* AC without prior DC scan */
133  WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, 0);
134  for (coefi = cinfo->Ss; coefi <= cinfo->Se; coefi++) {
135  int expected = (coef_bit_ptr[coefi] < 0) ? 0 : coef_bit_ptr[coefi];
136  if (cinfo->Ah != expected)
137  WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, coefi);
138  coef_bit_ptr[coefi] = cinfo->Al;
139  }
140  }
141 
142  /* Select MCU decoding routine */
143  if (cinfo->Ah == 0) {
144  if (is_DC_band)
145  entropy->pub.decode_mcu = decode_mcu_DC_first;
146  else
147  entropy->pub.decode_mcu = decode_mcu_AC_first;
148  } else {
149  if (is_DC_band)
150  entropy->pub.decode_mcu = decode_mcu_DC_refine;
151  else
152  entropy->pub.decode_mcu = decode_mcu_AC_refine;
153  }
154 
155  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
156  compptr = cinfo->cur_comp_info[ci];
157  /* Make sure requested tables are present, and compute derived tables.
158  * We may build same derived table more than once, but it's not expensive.
159  */
160  if (is_DC_band) {
161  if (cinfo->Ah == 0) { /* DC refinement needs no table */
162  tbl = compptr->dc_tbl_no;
163  if (tbl < 0 || tbl >= NUM_HUFF_TBLS ||
164  cinfo->dc_huff_tbl_ptrs[tbl] == NULL)
165  ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tbl);
166  jpeg_make_d_derived_tbl(cinfo, cinfo->dc_huff_tbl_ptrs[tbl],
167  & entropy->derived_tbls[tbl]);
168  }
169  } else {
170  tbl = compptr->ac_tbl_no;
171  if (tbl < 0 || tbl >= NUM_HUFF_TBLS ||
172  cinfo->ac_huff_tbl_ptrs[tbl] == NULL)
173  ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tbl);
174  jpeg_make_d_derived_tbl(cinfo, cinfo->ac_huff_tbl_ptrs[tbl],
175  & entropy->derived_tbls[tbl]);
176  /* remember the single active table */
177  entropy->ac_derived_tbl = entropy->derived_tbls[tbl];
178  }
179  /* Initialize DC predictions to 0 */
180  entropy->saved.last_dc_val[ci] = 0;
181  }
182 
183  /* Initialize bitread state variables */
184  entropy->bitstate.bits_left = 0;
185  entropy->bitstate.get_buffer = 0; /* unnecessary, but keeps Purify quiet */
186  entropy->bitstate.printed_eod = FALSE;
187 
188  /* Initialize private state variables */
189  entropy->saved.EOBRUN = 0;
190 
191  /* Initialize restart counter */
192  entropy->restarts_to_go = cinfo->restart_interval;
193 }
194 
195 
196 /*
197  * Figure F.12: extend sign bit.
198  * On some machines, a shift and add will be faster than a table lookup.
199  */
200 
201 #ifdef AVOID_TABLES
202 
203 #define HUFF_EXTEND(x,s) ((x) < (1<<((s)-1)) ? (x) + (((-1)<<(s)) + 1) : (x))
204 
205 #else
206 
207 #define HUFF_EXTEND(x,s) ((x) < extend_test[s] ? (x) + extend_offset[s] : (x))
208 
209 static const int extend_test[16] = /* entry n is 2**(n-1) */
210  { 0, 0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080,
211  0x0100, 0x0200, 0x0400, 0x0800, 0x1000, 0x2000, 0x4000 };
212 
213 static const int extend_offset[16] = /* entry n is (-1 << n) + 1 */
214  { 0, ((-1)<<1) + 1, ((-1)<<2) + 1, ((-1)<<3) + 1, ((-1)<<4) + 1,
215  ((-1)<<5) + 1, ((-1)<<6) + 1, ((-1)<<7) + 1, ((-1)<<8) + 1,
216  ((-1)<<9) + 1, ((-1)<<10) + 1, ((-1)<<11) + 1, ((-1)<<12) + 1,
217  ((-1)<<13) + 1, ((-1)<<14) + 1, ((-1)<<15) + 1 };
218 
219 #endif /* AVOID_TABLES */
220 
221 
222 /*
223  * Check for a restart marker & resynchronize decoder.
224  * Returns FALSE if must suspend.
225  */
226 
227 LOCAL boolean
229 {
230  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
231  int ci;
232 
233  /* Throw away any unused bits remaining in bit buffer; */
234  /* include any full bytes in next_marker's count of discarded bytes */
235  cinfo->marker->discarded_bytes += entropy->bitstate.bits_left / 8;
236  entropy->bitstate.bits_left = 0;
237 
238  /* Advance past the RSTn marker */
239  if (! (*cinfo->marker->read_restart_marker) (cinfo))
240  return FALSE;
241 
242  /* Re-initialize DC predictions to 0 */
243  for (ci = 0; ci < cinfo->comps_in_scan; ci++)
244  entropy->saved.last_dc_val[ci] = 0;
245  /* Re-init EOB run count, too */
246  entropy->saved.EOBRUN = 0;
247 
248  /* Reset restart counter */
249  entropy->restarts_to_go = cinfo->restart_interval;
250 
251  /* Next segment can get another out-of-data warning */
252  entropy->bitstate.printed_eod = FALSE;
253 
254  return TRUE;
255 }
256 
257 
258 /*
259  * Huffman MCU decoding.
260  * Each of these routines decodes and returns one MCU's worth of
261  * Huffman-compressed coefficients.
262  * The coefficients are reordered from zigzag order into natural array order,
263  * but are not dequantized.
264  *
265  * The i'th block of the MCU is stored into the block pointed to by
266  * MCU_data[i]. WE ASSUME THIS AREA IS INITIALLY ZEROED BY THE CALLER.
267  *
268  * We return FALSE if data source requested suspension. In that case no
269  * changes have been made to permanent state. (Exception: some output
270  * coefficients may already have been assigned. This is harmless for
271  * spectral selection, since we'll just re-assign them on the next call.
272  * Successive approximation AC refinement has to be more careful, however.)
273  */
274 
275 /*
276  * MCU decoding for DC initial scan (either spectral selection,
277  * or first pass of successive approximation).
278  */
279 
280 METHODDEF boolean
281 decode_mcu_DC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
282 {
283  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
284  int Al = cinfo->Al;
285  register int s, r;
286  int blkn, ci;
287  JBLOCKROW block;
289  savable_state state;
290  d_derived_tbl * tbl;
291  jpeg_component_info * compptr;
292 
293  /* Process restart marker if needed; may have to suspend */
294  if (cinfo->restart_interval) {
295  if (entropy->restarts_to_go == 0)
296  if (! process_restart(cinfo))
297  return FALSE;
298  }
299 
300  /* Load up working state */
301  BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
302  ASSIGN_STATE(state, entropy->saved);
303 
304  /* Outer loop handles each block in the MCU */
305 
306  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
307  block = MCU_data[blkn];
308  ci = cinfo->MCU_membership[blkn];
309  compptr = cinfo->cur_comp_info[ci];
310  tbl = entropy->derived_tbls[compptr->dc_tbl_no];
311 
312  /* Decode a single block's worth of coefficients */
313 
314  /* Section F.2.2.1: decode the DC coefficient difference */
315  HUFF_DECODE(s, br_state, tbl, return FALSE, label1);
316  if (s) {
317  CHECK_BIT_BUFFER(br_state, s, return FALSE);
318  r = GET_BITS(s);
319  s = HUFF_EXTEND(r, s);
320  }
321 
322  /* Convert DC difference to actual value, update last_dc_val */
323  s += state.last_dc_val[ci];
324  state.last_dc_val[ci] = s;
325  /* Scale and output the DC coefficient (assumes jpeg_natural_order[0]=0) */
326  (*block)[0] = (JCOEF) (s << Al);
327  }
328 
329  /* Completed MCU, so update state */
330  BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
331  ASSIGN_STATE(entropy->saved, state);
332 
333  /* Account for restart interval (no-op if not using restarts) */
334  entropy->restarts_to_go--;
335 
336  return TRUE;
337 }
338 
339 
340 /*
341  * MCU decoding for AC initial scan (either spectral selection,
342  * or first pass of successive approximation).
343  */
344 
345 METHODDEF boolean
346 decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
347 {
348  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
349  int Se = cinfo->Se;
350  int Al = cinfo->Al;
351  register int s, k, r;
352  unsigned int EOBRUN;
353  JBLOCKROW block;
355  d_derived_tbl * tbl;
356 
357  /* Process restart marker if needed; may have to suspend */
358  if (cinfo->restart_interval) {
359  if (entropy->restarts_to_go == 0)
360  if (! process_restart(cinfo))
361  return FALSE;
362  }
363 
364  /* Load up working state.
365  * We can avoid loading/saving bitread state if in an EOB run.
366  */
367  EOBRUN = entropy->saved.EOBRUN; /* only part of saved state we care about */
368 
369  /* There is always only one block per MCU */
370 
371  if (EOBRUN > 0) /* if it's a band of zeroes... */
372  EOBRUN--; /* ...process it now (we do nothing) */
373  else {
374  BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
375  block = MCU_data[0];
376  tbl = entropy->ac_derived_tbl;
377 
378  for (k = cinfo->Ss; k <= Se; k++) {
379  HUFF_DECODE(s, br_state, tbl, return FALSE, label2);
380  r = s >> 4;
381  s &= 15;
382  if (s) {
383  k += r;
384  CHECK_BIT_BUFFER(br_state, s, return FALSE);
385  r = GET_BITS(s);
386  s = HUFF_EXTEND(r, s);
387  /* Scale and output coefficient in natural (dezigzagged) order */
388  (*block)[jpeg_natural_order[k]] = (JCOEF) (s << Al);
389  } else {
390  if (r == 15) { /* ZRL */
391  k += 15; /* skip 15 zeroes in band */
392  } else { /* EOBr, run length is 2^r + appended bits */
393  EOBRUN = 1 << r;
394  if (r) { /* EOBr, r > 0 */
395  CHECK_BIT_BUFFER(br_state, r, return FALSE);
396  r = GET_BITS(r);
397  EOBRUN += r;
398  }
399  EOBRUN--; /* this band is processed at this moment */
400  break; /* force end-of-band */
401  }
402  }
403  }
404 
405  BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
406  }
407 
408  /* Completed MCU, so update state */
409  entropy->saved.EOBRUN = EOBRUN; /* only part of saved state we care about */
410 
411  /* Account for restart interval (no-op if not using restarts) */
412  entropy->restarts_to_go--;
413 
414  return TRUE;
415 }
416 
417 
418 /*
419  * MCU decoding for DC successive approximation refinement scan.
420  * Note: we assume such scans can be multi-component, although the spec
421  * is not very clear on the point.
422  */
423 
424 METHODDEF boolean
425 decode_mcu_DC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
426 {
427  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
428  int p1 = 1 << cinfo->Al; /* 1 in the bit position being coded */
429  int blkn;
430  JBLOCKROW block;
432 
433  /* Process restart marker if needed; may have to suspend */
434  if (cinfo->restart_interval) {
435  if (entropy->restarts_to_go == 0)
436  if (! process_restart(cinfo))
437  return FALSE;
438  }
439 
440  /* Load up working state */
441  BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
442 
443  /* Outer loop handles each block in the MCU */
444 
445  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
446  block = MCU_data[blkn];
447 
448  /* Encoded data is simply the next bit of the two's-complement DC value */
449  CHECK_BIT_BUFFER(br_state, 1, return FALSE);
450  if (GET_BITS(1))
451  (*block)[0] |= p1;
452  /* Note: since we use |=, repeating the assignment later is safe */
453  }
454 
455  /* Completed MCU, so update state */
456  BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
457 
458  /* Account for restart interval (no-op if not using restarts) */
459  entropy->restarts_to_go--;
460 
461  return TRUE;
462 }
463 
464 
465 /*
466  * MCU decoding for AC successive approximation refinement scan.
467  */
468 
469 METHODDEF boolean
470 decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
471 {
472  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
473  int Se = cinfo->Se;
474  int p1 = 1 << cinfo->Al; /* 1 in the bit position being coded */
475  int m1 = (-1) << cinfo->Al; /* -1 in the bit position being coded */
476  register int s, k, r;
477  unsigned int EOBRUN;
478  JBLOCKROW block;
479  JCOEFPTR thiscoef;
481  d_derived_tbl * tbl;
482  int num_newnz;
483  int newnz_pos[DCTSIZE2];
484 
485  /* Process restart marker if needed; may have to suspend */
486  if (cinfo->restart_interval) {
487  if (entropy->restarts_to_go == 0)
488  if (! process_restart(cinfo))
489  return FALSE;
490  }
491 
492  /* Load up working state */
493  BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
494  EOBRUN = entropy->saved.EOBRUN; /* only part of saved state we care about */
495 
496  /* There is always only one block per MCU */
497  block = MCU_data[0];
498  tbl = entropy->ac_derived_tbl;
499 
500  /* If we are forced to suspend, we must undo the assignments to any newly
501  * nonzero coefficients in the block, because otherwise we'd get confused
502  * next time about which coefficients were already nonzero.
503  * But we need not undo addition of bits to already-nonzero coefficients;
504  * instead, we can test the current bit position to see if we already did it.
505  */
506  num_newnz = 0;
507 
508  /* initialize coefficient loop counter to start of band */
509  k = cinfo->Ss;
510 
511  if (EOBRUN == 0) {
512  for (; k <= Se; k++) {
513  HUFF_DECODE(s, br_state, tbl, goto undoit, label3);
514  r = s >> 4;
515  s &= 15;
516  if (s) {
517  if (s != 1) /* size of new coef should always be 1 */
518  WARNMS(cinfo, JWRN_HUFF_BAD_CODE);
519  CHECK_BIT_BUFFER(br_state, 1, goto undoit);
520  if (GET_BITS(1))
521  s = p1; /* newly nonzero coef is positive */
522  else
523  s = m1; /* newly nonzero coef is negative */
524  } else {
525  if (r != 15) {
526  EOBRUN = 1 << r; /* EOBr, run length is 2^r + appended bits */
527  if (r) {
528  CHECK_BIT_BUFFER(br_state, r, goto undoit);
529  r = GET_BITS(r);
530  EOBRUN += r;
531  }
532  break; /* rest of block is handled by EOB logic */
533  }
534  /* note s = 0 for processing ZRL */
535  }
536  /* Advance over already-nonzero coefs and r still-zero coefs,
537  * appending correction bits to the nonzeroes. A correction bit is 1
538  * if the absolute value of the coefficient must be increased.
539  */
540  do {
541  thiscoef = *block + jpeg_natural_order[k];
542  if (*thiscoef != 0) {
543  CHECK_BIT_BUFFER(br_state, 1, goto undoit);
544  if (GET_BITS(1)) {
545  if ((*thiscoef & p1) == 0) { /* do nothing if already changed it */
546  if (*thiscoef >= 0)
547  *thiscoef += p1;
548  else
549  *thiscoef += m1;
550  }
551  }
552  } else {
553  if (--r < 0)
554  break; /* reached target zero coefficient */
555  }
556  k++;
557  } while (k <= Se);
558  if (s) {
559  int pos = jpeg_natural_order[k];
560  /* Output newly nonzero coefficient */
561  (*block)[pos] = (JCOEF) s;
562  /* Remember its position in case we have to suspend */
563  newnz_pos[num_newnz++] = pos;
564  }
565  }
566  }
567 
568  if (EOBRUN > 0) {
569  /* Scan any remaining coefficient positions after the end-of-band
570  * (the last newly nonzero coefficient, if any). Append a correction
571  * bit to each already-nonzero coefficient. A correction bit is 1
572  * if the absolute value of the coefficient must be increased.
573  */
574  for (; k <= Se; k++) {
575  thiscoef = *block + jpeg_natural_order[k];
576  if (*thiscoef != 0) {
577  CHECK_BIT_BUFFER(br_state, 1, goto undoit);
578  if (GET_BITS(1)) {
579  if ((*thiscoef & p1) == 0) { /* do nothing if already changed it */
580  if (*thiscoef >= 0)
581  *thiscoef += p1;
582  else
583  *thiscoef += m1;
584  }
585  }
586  }
587  }
588  /* Count one block completed in EOB run */
589  EOBRUN--;
590  }
591 
592  /* Completed MCU, so update state */
593  BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
594  entropy->saved.EOBRUN = EOBRUN; /* only part of saved state we care about */
595 
596  /* Account for restart interval (no-op if not using restarts) */
597  entropy->restarts_to_go--;
598 
599  return TRUE;
600 
601 undoit:
602  /* Re-zero any output coefficients that we made newly nonzero */
603  while (num_newnz > 0)
604  (*block)[newnz_pos[--num_newnz]] = 0;
605 
606  return FALSE;
607 }
608 
609 
610 /*
611  * Module initialization routine for progressive Huffman entropy decoding.
612  */
613 
614 GLOBAL void
615 jinit_phuff_decoder (j_decompress_ptr cinfo)
616 {
617  phuff_entropy_ptr entropy;
618  int *coef_bit_ptr;
619  int ci, i;
620 
621  entropy = (phuff_entropy_ptr)
622  (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
623  SIZEOF(phuff_entropy_decoder));
624  cinfo->entropy = (struct jpeg_entropy_decoder *) entropy;
625  entropy->pub.start_pass = start_pass_phuff_decoder;
626 
627  /* Mark derived tables unallocated */
628  for (i = 0; i < NUM_HUFF_TBLS; i++) {
629  entropy->derived_tbls[i] = NULL;
630  }
631 
632  /* Create progression status table */
633  cinfo->coef_bits = (int (*)[DCTSIZE2])
634  (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
635  cinfo->num_components*DCTSIZE2*SIZEOF(int));
636  coef_bit_ptr = & cinfo->coef_bits[0][0];
637  for (ci = 0; ci < cinfo->num_components; ci++)
638  for (i = 0; i < DCTSIZE2; i++)
639  *coef_bit_ptr++ = -1;
640 }
641 
642 #endif /* D_PROGRESSIVE_SUPPORTED */
#define BITREAD_STATE_VARS
Definition: jdhuff.h:100
unsigned int restarts_to_go
Definition: jcphuff.c:49
#define HUFF_EXTEND(x, s)
Definition: jdhuff.c:372
unsigned int discarded_bytes
Definition: jpegint.h:207
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Definition: jpeglib.h:584
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Definition: jpeglib.h:520
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Definition: jutils.c:49
struct jpeg_common_struct * j_common_ptr
Definition: jpeglib.h:260
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case const int
Definition: Callbacks.cpp:52
#define NUM_HUFF_TBLS
Definition: jpeglib.h:45
#define LOCAL
Definition: jmorecfg.h:189
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Definition: jchuff.c:41
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Definition: jinclude.h:80
c_derived_tbl * derived_tbls[NUM_HUFF_TBLS]
Definition: jcphuff.c:56
short JCOEF
Definition: jmorecfg.h:99
#define HUFF_DECODE(result, state, htbl, failaction, slowlabel)
Definition: jdhuff.h:177
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Definition: glext.h:2935
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Definition: process.py:33
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Definition: jdhuff.h:145
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Definition: jpeglib.h:736
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Definition: jerror.h:233
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Definition: jerror.h:211
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Definition: jpeglib.h:43
struct jpeg_entropy_encoder pub
Definition: jcphuff.c:25
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Definition: Lib.h:88
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Definition: jpeglib.h:540
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Definition: jdhuff.c:128
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Definition: jdhuff.h:139
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Definition: jcphuff.c:62
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Definition: jpeglib.h:84
#define WARNMS(cinfo, code)
Definition: jerror.h:226
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Definition: jpeglib.h:88
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Definition: jpeglib.h:802
#define GLOBAL
Definition: jmorecfg.h:190
#define METHODDEF
Definition: jmorecfg.h:188
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Definition: jerror.h:196
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Definition: jdhuff.h:114
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Definition: jpeglib.h:521
GLdouble GLdouble GLdouble r
Definition: glext.h:2951
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Definition: jcphuff.c:44
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Definition: jpeglib.h:591
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Definition: mprintf.c:70
LOCAL boolean process_restart(j_decompress_ptr cinfo)
Definition: jdhuff.c:393
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Definition: jdhuff.h:105
#define TRUE
Definition: mprintf.c:69
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Definition: jpeglib.h:506
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Definition: jpegint.h:196
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#define MAX_COMPS_IN_SCAN
Definition: jpeglib.h:47