jdmarker.c
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1 /*
2  * jdmarker.c
3  *
4  * Copyright (C) 1991-1998, 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 routines to decode JPEG datastream markers.
9  * Most of the complexity arises from our desire to support input
10  * suspension: if not all of the data for a marker is available,
11  * we must exit back to the application. On resumption, we reprocess
12  * the marker.
13  */
14 
15 #define JPEG_INTERNALS
16 #include "jinclude.h"
17 #include "jpeglib.h"
18 
19 
20 typedef enum { /* JPEG marker codes */
21  M_SOF0 = 0xc0,
22  M_SOF1 = 0xc1,
23  M_SOF2 = 0xc2,
24  M_SOF3 = 0xc3,
25 
26  M_SOF5 = 0xc5,
27  M_SOF6 = 0xc6,
28  M_SOF7 = 0xc7,
29 
30  M_JPG = 0xc8,
31  M_SOF9 = 0xc9,
32  M_SOF10 = 0xca,
33  M_SOF11 = 0xcb,
34 
35  M_SOF13 = 0xcd,
36  M_SOF14 = 0xce,
37  M_SOF15 = 0xcf,
38 
39  M_DHT = 0xc4,
40 
41  M_DAC = 0xcc,
42 
43  M_RST0 = 0xd0,
44  M_RST1 = 0xd1,
45  M_RST2 = 0xd2,
46  M_RST3 = 0xd3,
47  M_RST4 = 0xd4,
48  M_RST5 = 0xd5,
49  M_RST6 = 0xd6,
50  M_RST7 = 0xd7,
51 
52  M_SOI = 0xd8,
53  M_EOI = 0xd9,
54  M_SOS = 0xda,
55  M_DQT = 0xdb,
56  M_DNL = 0xdc,
57  M_DRI = 0xdd,
58  M_DHP = 0xde,
59  M_EXP = 0xdf,
60 
61  M_APP0 = 0xe0,
62  M_APP1 = 0xe1,
63  M_APP2 = 0xe2,
64  M_APP3 = 0xe3,
65  M_APP4 = 0xe4,
66  M_APP5 = 0xe5,
67  M_APP6 = 0xe6,
68  M_APP7 = 0xe7,
69  M_APP8 = 0xe8,
70  M_APP9 = 0xe9,
71  M_APP10 = 0xea,
72  M_APP11 = 0xeb,
73  M_APP12 = 0xec,
74  M_APP13 = 0xed,
75  M_APP14 = 0xee,
76  M_APP15 = 0xef,
77 
78  M_JPG0 = 0xf0,
79  M_JPG13 = 0xfd,
80  M_COM = 0xfe,
81 
82  M_TEM = 0x01,
83 
84  M_ERROR = 0x100
85 } JPEG_MARKER;
86 
87 
88 /* Private state */
89 
90 typedef struct {
91  struct jpeg_marker_reader pub; /* public fields */
92 
93  /* Application-overridable marker processing methods */
94  jpeg_marker_parser_method process_COM;
95  jpeg_marker_parser_method process_APPn[16];
96 
97  /* Limit on marker data length to save for each marker type */
98  unsigned int length_limit_COM;
99  unsigned int length_limit_APPn[16];
100 
101  /* Status of COM/APPn marker saving */
102  jpeg_saved_marker_ptr cur_marker; /* NULL if not processing a marker */
103  unsigned int bytes_read; /* data bytes read so far in marker */
104  /* Note: cur_marker is not linked into marker_list until it's all read. */
106 
108 
109 
110 /*
111  * Macros for fetching data from the data source module.
112  *
113  * At all times, cinfo->src->next_input_byte and ->bytes_in_buffer reflect
114  * the current restart point; we update them only when we have reached a
115  * suitable place to restart if a suspension occurs.
116  */
117 
118 /* Declare and initialize local copies of input pointer/count */
119 #define INPUT_VARS(cinfo) \
120  struct jpeg_source_mgr * datasrc = (cinfo)->src; \
121  const JOCTET * next_input_byte = datasrc->next_input_byte; \
122  size_t bytes_in_buffer = datasrc->bytes_in_buffer
123 
124 /* Unload the local copies --- do this only at a restart boundary */
125 #define INPUT_SYNC(cinfo) \
126  ( datasrc->next_input_byte = next_input_byte, \
127  datasrc->bytes_in_buffer = bytes_in_buffer )
128 
129 /* Reload the local copies --- used only in MAKE_BYTE_AVAIL */
130 #define INPUT_RELOAD(cinfo) \
131  ( next_input_byte = datasrc->next_input_byte, \
132  bytes_in_buffer = datasrc->bytes_in_buffer )
133 
134 /* Internal macro for INPUT_BYTE and INPUT_2BYTES: make a byte available.
135  * Note we do *not* do INPUT_SYNC before calling fill_input_buffer,
136  * but we must reload the local copies after a successful fill.
137  */
138 #define MAKE_BYTE_AVAIL(cinfo,action) \
139  if (bytes_in_buffer == 0) { \
140  if (! (*datasrc->fill_input_buffer) (cinfo)) \
141  { action; } \
142  INPUT_RELOAD(cinfo); \
143  }
144 
145 /* Read a byte into variable V.
146  * If must suspend, take the specified action (typically "return FALSE").
147  */
148 #define INPUT_BYTE(cinfo,V,action) \
149  MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \
150  bytes_in_buffer--; \
151  V = GETJOCTET(*next_input_byte++); )
152 
153 /* As above, but read two bytes interpreted as an unsigned 16-bit integer.
154  * V should be declared unsigned int or perhaps INT32.
155  */
156 #define INPUT_2BYTES(cinfo,V,action) \
157  MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \
158  bytes_in_buffer--; \
159  V = ((unsigned int) GETJOCTET(*next_input_byte++)) << 8; \
160  MAKE_BYTE_AVAIL(cinfo,action); \
161  bytes_in_buffer--; \
162  V += GETJOCTET(*next_input_byte++); )
163 
164 
165 /*
166  * Routines to process JPEG markers.
167  *
168  * Entry condition: JPEG marker itself has been read and its code saved
169  * in cinfo->unread_marker; input restart point is just after the marker.
170  *
171  * Exit: if return TRUE, have read and processed any parameters, and have
172  * updated the restart point to point after the parameters.
173  * If return FALSE, was forced to suspend before reaching end of
174  * marker parameters; restart point has not been moved. Same routine
175  * will be called again after application supplies more input data.
176  *
177  * This approach to suspension assumes that all of a marker's parameters
178  * can fit into a single input bufferload. This should hold for "normal"
179  * markers. Some COM/APPn markers might have large parameter segments
180  * that might not fit. If we are simply dropping such a marker, we use
181  * skip_input_data to get past it, and thereby put the problem on the
182  * source manager's shoulders. If we are saving the marker's contents
183  * into memory, we use a slightly different convention: when forced to
184  * suspend, the marker processor updates the restart point to the end of
185  * what it's consumed (ie, the end of the buffer) before returning FALSE.
186  * On resumption, cinfo->unread_marker still contains the marker code,
187  * but the data source will point to the next chunk of marker data.
188  * The marker processor must retain internal state to deal with this.
189  *
190  * Note that we don't bother to avoid duplicate trace messages if a
191  * suspension occurs within marker parameters. Other side effects
192  * require more care.
193  */
194 
195 
196 LOCAL(boolean)
198 /* Process an SOI marker */
199 {
200  int i;
201 
202  TRACEMS(cinfo, 1, JTRC_SOI);
203 
204  if (cinfo->marker->saw_SOI)
205  ERREXIT(cinfo, JERR_SOI_DUPLICATE);
206 
207  /* Reset all parameters that are defined to be reset by SOI */
208 
209  for (i = 0; i < NUM_ARITH_TBLS; i++) {
210  cinfo->arith_dc_L[i] = 0;
211  cinfo->arith_dc_U[i] = 1;
212  cinfo->arith_ac_K[i] = 5;
213  }
214  cinfo->restart_interval = 0;
215 
216  /* Set initial assumptions for colorspace etc */
217 
218  cinfo->jpeg_color_space = JCS_UNKNOWN;
219  cinfo->CCIR601_sampling = FALSE; /* Assume non-CCIR sampling??? */
220 
221  cinfo->saw_JFIF_marker = FALSE;
222  cinfo->JFIF_major_version = 1; /* set default JFIF APP0 values */
223  cinfo->JFIF_minor_version = 1;
224  cinfo->density_unit = 0;
225  cinfo->X_density = 1;
226  cinfo->Y_density = 1;
227  cinfo->saw_Adobe_marker = FALSE;
228  cinfo->Adobe_transform = 0;
229 
230  cinfo->marker->saw_SOI = TRUE;
231 
232  return TRUE;
233 }
234 
235 
236 LOCAL(boolean)
237 get_sof (j_decompress_ptr cinfo, boolean is_prog, boolean is_arith)
238 /* Process a SOFn marker */
239 {
240  INT32 length;
241  int c, ci;
243  INPUT_VARS(cinfo);
244 
245  cinfo->progressive_mode = is_prog;
246  cinfo->arith_code = is_arith;
247 
248  INPUT_2BYTES(cinfo, length, return FALSE);
249 
250  INPUT_BYTE(cinfo, cinfo->data_precision, return FALSE);
251  INPUT_2BYTES(cinfo, cinfo->image_height, return FALSE);
252  INPUT_2BYTES(cinfo, cinfo->image_width, return FALSE);
253  INPUT_BYTE(cinfo, cinfo->num_components, return FALSE);
254 
255  length -= 8;
256 
257  TRACEMS4(cinfo, 1, JTRC_SOF, cinfo->unread_marker,
258  (int) cinfo->image_width, (int) cinfo->image_height,
259  cinfo->num_components);
260 
261  if (cinfo->marker->saw_SOF)
262  ERREXIT(cinfo, JERR_SOF_DUPLICATE);
263 
264  /* We don't support files in which the image height is initially specified */
265  /* as 0 and is later redefined by DNL. As long as we have to check that, */
266  /* might as well have a general sanity check. */
267  if (cinfo->image_height <= 0 || cinfo->image_width <= 0
268  || cinfo->num_components <= 0)
269  ERREXIT(cinfo, JERR_EMPTY_IMAGE);
270 
271  if (length != (cinfo->num_components * 3))
272  ERREXIT(cinfo, JERR_BAD_LENGTH);
273 
274  if (cinfo->comp_info == NULL) /* do only once, even if suspend */
275  cinfo->comp_info = (jpeg_component_info *) (*cinfo->mem->alloc_small)
276  ((j_common_ptr) cinfo, JPOOL_IMAGE,
277  cinfo->num_components * SIZEOF(jpeg_component_info));
278 
279  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
280  ci++, compptr++) {
281  compptr->component_index = ci;
282  INPUT_BYTE(cinfo, compptr->component_id, return FALSE);
283  INPUT_BYTE(cinfo, c, return FALSE);
284  compptr->h_samp_factor = (c >> 4) & 15;
285  compptr->v_samp_factor = (c ) & 15;
286  INPUT_BYTE(cinfo, compptr->quant_tbl_no, return FALSE);
287 
288  TRACEMS4(cinfo, 1, JTRC_SOF_COMPONENT,
289  compptr->component_id, compptr->h_samp_factor,
290  compptr->v_samp_factor, compptr->quant_tbl_no);
291  }
292 
293  cinfo->marker->saw_SOF = TRUE;
294 
295  INPUT_SYNC(cinfo);
296  return TRUE;
297 }
298 
299 
300 LOCAL(boolean)
302 /* Process a SOS marker */
303 {
304  INT32 length;
305  int i, ci, n, c, cc;
307  INPUT_VARS(cinfo);
308 
309  if (! cinfo->marker->saw_SOF)
310  ERREXIT(cinfo, JERR_SOS_NO_SOF);
311 
312  INPUT_2BYTES(cinfo, length, return FALSE);
313 
314  INPUT_BYTE(cinfo, n, return FALSE); /* Number of components */
315 
316  TRACEMS1(cinfo, 1, JTRC_SOS, n);
317 
318  if (length != (n * 2 + 6) || n < 1 || n > MAX_COMPS_IN_SCAN)
319  ERREXIT(cinfo, JERR_BAD_LENGTH);
320 
321  cinfo->comps_in_scan = n;
322 
323  /* Collect the component-spec parameters */
324 
325  for (i = 0; i < n; i++) {
326  INPUT_BYTE(cinfo, cc, return FALSE);
327  INPUT_BYTE(cinfo, c, return FALSE);
328 
329  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
330  ci++, compptr++) {
331  if (cc == compptr->component_id)
332  goto id_found;
333  }
334 
335  ERREXIT1(cinfo, JERR_BAD_COMPONENT_ID, cc);
336 
337  id_found:
338 
339  cinfo->cur_comp_info[i] = compptr;
340  compptr->dc_tbl_no = (c >> 4) & 15;
341  compptr->ac_tbl_no = (c ) & 15;
342 
343  TRACEMS3(cinfo, 1, JTRC_SOS_COMPONENT, cc,
344  compptr->dc_tbl_no, compptr->ac_tbl_no);
345  }
346 
347  /* Collect the additional scan parameters Ss, Se, Ah/Al. */
348  INPUT_BYTE(cinfo, c, return FALSE);
349  cinfo->Ss = c;
350  INPUT_BYTE(cinfo, c, return FALSE);
351  cinfo->Se = c;
352  INPUT_BYTE(cinfo, c, return FALSE);
353  cinfo->Ah = (c >> 4) & 15;
354  cinfo->Al = (c ) & 15;
355 
356  TRACEMS4(cinfo, 1, JTRC_SOS_PARAMS, cinfo->Ss, cinfo->Se,
357  cinfo->Ah, cinfo->Al);
358 
359  /* Prepare to scan data & restart markers */
360  cinfo->marker->next_restart_num = 0;
361 
362  /* Count another SOS marker */
363  cinfo->input_scan_number++;
364 
365  INPUT_SYNC(cinfo);
366  return TRUE;
367 }
368 
369 
370 #ifdef D_ARITH_CODING_SUPPORTED
371 
372 LOCAL(boolean)
374 /* Process a DAC marker */
375 {
376  INT32 length;
377  int index, val;
378  INPUT_VARS(cinfo);
379 
380  INPUT_2BYTES(cinfo, length, return FALSE);
381  length -= 2;
382 
383  while (length > 0) {
384  INPUT_BYTE(cinfo, index, return FALSE);
385  INPUT_BYTE(cinfo, val, return FALSE);
386 
387  length -= 2;
388 
389  TRACEMS2(cinfo, 1, JTRC_DAC, index, val);
390 
391  if (index < 0 || index >= (2*NUM_ARITH_TBLS))
392  ERREXIT1(cinfo, JERR_DAC_INDEX, index);
393 
394  if (index >= NUM_ARITH_TBLS) { /* define AC table */
395  cinfo->arith_ac_K[index-NUM_ARITH_TBLS] = (UINT8) val;
396  } else { /* define DC table */
397  cinfo->arith_dc_L[index] = (UINT8) (val & 0x0F);
398  cinfo->arith_dc_U[index] = (UINT8) (val >> 4);
399  if (cinfo->arith_dc_L[index] > cinfo->arith_dc_U[index])
400  ERREXIT1(cinfo, JERR_DAC_VALUE, val);
401  }
402  }
403 
404  if (length != 0)
405  ERREXIT(cinfo, JERR_BAD_LENGTH);
406 
407  INPUT_SYNC(cinfo);
408  return TRUE;
409 }
410 
411 #else /* ! D_ARITH_CODING_SUPPORTED */
412 
413 #define get_dac(cinfo) skip_variable(cinfo)
414 
415 #endif /* D_ARITH_CODING_SUPPORTED */
416 
417 
418 LOCAL(boolean)
420 /* Process a DHT marker */
421 {
422  INT32 length;
423  UINT8 bits[17];
424  UINT8 huffval[256];
425  int i, index, count;
426  JHUFF_TBL **htblptr;
427  INPUT_VARS(cinfo);
428 
429  INPUT_2BYTES(cinfo, length, return FALSE);
430  length -= 2;
431 
432  while (length > 16) {
433  INPUT_BYTE(cinfo, index, return FALSE);
434 
435  TRACEMS1(cinfo, 1, JTRC_DHT, index);
436 
437  bits[0] = 0;
438  count = 0;
439  for (i = 1; i <= 16; i++) {
440  INPUT_BYTE(cinfo, bits[i], return FALSE);
441  count += bits[i];
442  }
443 
444  length -= 1 + 16;
445 
446  TRACEMS8(cinfo, 2, JTRC_HUFFBITS,
447  bits[1], bits[2], bits[3], bits[4],
448  bits[5], bits[6], bits[7], bits[8]);
449  TRACEMS8(cinfo, 2, JTRC_HUFFBITS,
450  bits[9], bits[10], bits[11], bits[12],
451  bits[13], bits[14], bits[15], bits[16]);
452 
453  /* Here we just do minimal validation of the counts to avoid walking
454  * off the end of our table space. jdhuff.c will check more carefully.
455  */
456  if (count > 256 || ((INT32) count) > length)
457  ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
458 
459  for (i = 0; i < count; i++)
460  INPUT_BYTE(cinfo, huffval[i], return FALSE);
461 
462  length -= count;
463 
464  if (index & 0x10) { /* AC table definition */
465  index -= 0x10;
466  htblptr = &cinfo->ac_huff_tbl_ptrs[index];
467  } else { /* DC table definition */
468  htblptr = &cinfo->dc_huff_tbl_ptrs[index];
469  }
470 
471  if (index < 0 || index >= NUM_HUFF_TBLS)
472  ERREXIT1(cinfo, JERR_DHT_INDEX, index);
473 
474  if (*htblptr == NULL)
475  *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
476 
477  MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits));
478  MEMCOPY((*htblptr)->huffval, huffval, SIZEOF((*htblptr)->huffval));
479  }
480 
481  if (length != 0)
482  ERREXIT(cinfo, JERR_BAD_LENGTH);
483 
484  INPUT_SYNC(cinfo);
485  return TRUE;
486 }
487 
488 
489 LOCAL(boolean)
491 /* Process a DQT marker */
492 {
493  INT32 length;
494  int n, i, prec;
495  unsigned int tmp;
496  JQUANT_TBL *quant_ptr;
497  INPUT_VARS(cinfo);
498 
499  INPUT_2BYTES(cinfo, length, return FALSE);
500  length -= 2;
501 
502  while (length > 0) {
503  INPUT_BYTE(cinfo, n, return FALSE);
504  prec = n >> 4;
505  n &= 0x0F;
506 
507  TRACEMS2(cinfo, 1, JTRC_DQT, n, prec);
508 
509  if (n >= NUM_QUANT_TBLS)
510  ERREXIT1(cinfo, JERR_DQT_INDEX, n);
511 
512  if (cinfo->quant_tbl_ptrs[n] == NULL)
514  quant_ptr = cinfo->quant_tbl_ptrs[n];
515 
516  for (i = 0; i < DCTSIZE2; i++) {
517  if (prec)
518  INPUT_2BYTES(cinfo, tmp, return FALSE);
519  else
520  INPUT_BYTE(cinfo, tmp, return FALSE);
521  /* We convert the zigzag-order table to natural array order. */
522  quant_ptr->quantval[jpeg_natural_order[i]] = (UINT16) tmp;
523  }
524 
525  if (cinfo->err->trace_level >= 2) {
526  for (i = 0; i < DCTSIZE2; i += 8) {
527  TRACEMS8(cinfo, 2, JTRC_QUANTVALS,
528  quant_ptr->quantval[i], quant_ptr->quantval[i+1],
529  quant_ptr->quantval[i+2], quant_ptr->quantval[i+3],
530  quant_ptr->quantval[i+4], quant_ptr->quantval[i+5],
531  quant_ptr->quantval[i+6], quant_ptr->quantval[i+7]);
532  }
533  }
534 
535  length -= DCTSIZE2+1;
536  if (prec) length -= DCTSIZE2;
537  }
538 
539  if (length != 0)
540  ERREXIT(cinfo, JERR_BAD_LENGTH);
541 
542  INPUT_SYNC(cinfo);
543  return TRUE;
544 }
545 
546 
547 LOCAL(boolean)
549 /* Process a DRI marker */
550 {
551  INT32 length;
552  unsigned int tmp;
553  INPUT_VARS(cinfo);
554 
555  INPUT_2BYTES(cinfo, length, return FALSE);
556 
557  if (length != 4)
558  ERREXIT(cinfo, JERR_BAD_LENGTH);
559 
560  INPUT_2BYTES(cinfo, tmp, return FALSE);
561 
562  TRACEMS1(cinfo, 1, JTRC_DRI, tmp);
563 
564  cinfo->restart_interval = tmp;
565 
566  INPUT_SYNC(cinfo);
567  return TRUE;
568 }
569 
570 
571 /*
572  * Routines for processing APPn and COM markers.
573  * These are either saved in memory or discarded, per application request.
574  * APP0 and APP14 are specially checked to see if they are
575  * JFIF and Adobe markers, respectively.
576  */
577 
578 #define APP0_DATA_LEN 14 /* Length of interesting data in APP0 */
579 #define APP14_DATA_LEN 12 /* Length of interesting data in APP14 */
580 #define APPN_DATA_LEN 14 /* Must be the largest of the above!! */
581 
582 
583 LOCAL(void)
585  unsigned int datalen, INT32 remaining)
586 /* Examine first few bytes from an APP0.
587  * Take appropriate action if it is a JFIF marker.
588  * datalen is # of bytes at data[], remaining is length of rest of marker data.
589  */
590 {
591  INT32 totallen = (INT32) datalen + remaining;
592 
593  if (datalen >= APP0_DATA_LEN &&
594  GETJOCTET(data[0]) == 0x4A &&
595  GETJOCTET(data[1]) == 0x46 &&
596  GETJOCTET(data[2]) == 0x49 &&
597  GETJOCTET(data[3]) == 0x46 &&
598  GETJOCTET(data[4]) == 0) {
599  /* Found JFIF APP0 marker: save info */
600  cinfo->saw_JFIF_marker = TRUE;
601  cinfo->JFIF_major_version = GETJOCTET(data[5]);
602  cinfo->JFIF_minor_version = GETJOCTET(data[6]);
603  cinfo->density_unit = GETJOCTET(data[7]);
604  cinfo->X_density = (GETJOCTET(data[8]) << 8) + GETJOCTET(data[9]);
605  cinfo->Y_density = (GETJOCTET(data[10]) << 8) + GETJOCTET(data[11]);
606  /* Check version.
607  * Major version must be 1, anything else signals an incompatible change.
608  * (We used to treat this as an error, but now it's a nonfatal warning,
609  * because some bozo at Hijaak couldn't read the spec.)
610  * Minor version should be 0..2, but process anyway if newer.
611  */
612  if (cinfo->JFIF_major_version != 1)
613  WARNMS2(cinfo, JWRN_JFIF_MAJOR,
614  cinfo->JFIF_major_version, cinfo->JFIF_minor_version);
615  /* Generate trace messages */
616  TRACEMS5(cinfo, 1, JTRC_JFIF,
617  cinfo->JFIF_major_version, cinfo->JFIF_minor_version,
618  cinfo->X_density, cinfo->Y_density, cinfo->density_unit);
619  /* Validate thumbnail dimensions and issue appropriate messages */
620  if (GETJOCTET(data[12]) | GETJOCTET(data[13]))
621  TRACEMS2(cinfo, 1, JTRC_JFIF_THUMBNAIL,
622  GETJOCTET(data[12]), GETJOCTET(data[13]));
623  totallen -= APP0_DATA_LEN;
624  if (totallen !=
625  ((INT32)GETJOCTET(data[12]) * (INT32)GETJOCTET(data[13]) * (INT32) 3))
626  TRACEMS1(cinfo, 1, JTRC_JFIF_BADTHUMBNAILSIZE, (int) totallen);
627  } else if (datalen >= 6 &&
628  GETJOCTET(data[0]) == 0x4A &&
629  GETJOCTET(data[1]) == 0x46 &&
630  GETJOCTET(data[2]) == 0x58 &&
631  GETJOCTET(data[3]) == 0x58 &&
632  GETJOCTET(data[4]) == 0) {
633  /* Found JFIF "JFXX" extension APP0 marker */
634  /* The library doesn't actually do anything with these,
635  * but we try to produce a helpful trace message.
636  */
637  switch (GETJOCTET(data[5])) {
638  case 0x10:
639  TRACEMS1(cinfo, 1, JTRC_THUMB_JPEG, (int) totallen);
640  break;
641  case 0x11:
642  TRACEMS1(cinfo, 1, JTRC_THUMB_PALETTE, (int) totallen);
643  break;
644  case 0x13:
645  TRACEMS1(cinfo, 1, JTRC_THUMB_RGB, (int) totallen);
646  break;
647  default:
648  TRACEMS2(cinfo, 1, JTRC_JFIF_EXTENSION,
649  GETJOCTET(data[5]), (int) totallen);
650  break;
651  }
652  } else {
653  /* Start of APP0 does not match "JFIF" or "JFXX", or too short */
654  TRACEMS1(cinfo, 1, JTRC_APP0, (int) totallen);
655  }
656 }
657 
658 
659 LOCAL(void)
661  unsigned int datalen, INT32 remaining)
662 /* Examine first few bytes from an APP14.
663  * Take appropriate action if it is an Adobe marker.
664  * datalen is # of bytes at data[], remaining is length of rest of marker data.
665  */
666 {
667  unsigned int version, flags0, flags1, transform;
668 
669  if (datalen >= APP14_DATA_LEN &&
670  GETJOCTET(data[0]) == 0x41 &&
671  GETJOCTET(data[1]) == 0x64 &&
672  GETJOCTET(data[2]) == 0x6F &&
673  GETJOCTET(data[3]) == 0x62 &&
674  GETJOCTET(data[4]) == 0x65) {
675  /* Found Adobe APP14 marker */
676  version = (GETJOCTET(data[5]) << 8) + GETJOCTET(data[6]);
677  flags0 = (GETJOCTET(data[7]) << 8) + GETJOCTET(data[8]);
678  flags1 = (GETJOCTET(data[9]) << 8) + GETJOCTET(data[10]);
679  transform = GETJOCTET(data[11]);
680  TRACEMS4(cinfo, 1, JTRC_ADOBE, version, flags0, flags1, transform);
681  cinfo->saw_Adobe_marker = TRUE;
682  cinfo->Adobe_transform = (UINT8) transform;
683  } else {
684  /* Start of APP14 does not match "Adobe", or too short */
685  TRACEMS1(cinfo, 1, JTRC_APP14, (int) (datalen + remaining));
686  }
687 }
688 
689 
690 METHODDEF(boolean)
692 /* Process an APP0 or APP14 marker without saving it */
693 {
694  INT32 length;
696  unsigned int i, numtoread;
697  INPUT_VARS(cinfo);
698 
699  INPUT_2BYTES(cinfo, length, return FALSE);
700  length -= 2;
701 
702  /* get the interesting part of the marker data */
703  if (length >= APPN_DATA_LEN)
704  numtoread = APPN_DATA_LEN;
705  else if (length > 0)
706  numtoread = (unsigned int) length;
707  else
708  numtoread = 0;
709  for (i = 0; i < numtoread; i++)
710  INPUT_BYTE(cinfo, b[i], return FALSE);
711  length -= numtoread;
712 
713  /* process it */
714  switch (cinfo->unread_marker) {
715  case M_APP0:
716  examine_app0(cinfo, (JOCTET FAR *) b, numtoread, length);
717  break;
718  case M_APP14:
719  examine_app14(cinfo, (JOCTET FAR *) b, numtoread, length);
720  break;
721  default:
722  /* can't get here unless jpeg_save_markers chooses wrong processor */
723  ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo->unread_marker);
724  break;
725  }
726 
727  /* skip any remaining data -- could be lots */
728  INPUT_SYNC(cinfo);
729  if (length > 0)
730  (*cinfo->src->skip_input_data) (cinfo, (long) length);
731 
732  return TRUE;
733 }
734 
735 
736 #ifdef SAVE_MARKERS_SUPPORTED
737 
738 METHODDEF(boolean)
740 /* Save an APPn or COM marker into the marker list */
741 {
743  jpeg_saved_marker_ptr cur_marker = marker->cur_marker;
744  unsigned int bytes_read, data_length;
745  JOCTET FAR * data;
746  INT32 length = 0;
747  INPUT_VARS(cinfo);
748 
749  if (cur_marker == NULL) {
750  /* begin reading a marker */
751  INPUT_2BYTES(cinfo, length, return FALSE);
752  length -= 2;
753  if (length >= 0) { /* watch out for bogus length word */
754  /* figure out how much we want to save */
755  unsigned int limit;
756  if (cinfo->unread_marker == (int) M_COM)
757  limit = marker->length_limit_COM;
758  else
759  limit = marker->length_limit_APPn[cinfo->unread_marker - (int) M_APP0];
760  if ((unsigned int) length < limit)
761  limit = (unsigned int) length;
762  /* allocate and initialize the marker item */
763  cur_marker = (jpeg_saved_marker_ptr)
764  (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
765  SIZEOF(struct jpeg_marker_struct) + limit);
766  cur_marker->next = NULL;
767  cur_marker->marker = (UINT8) cinfo->unread_marker;
768  cur_marker->original_length = (unsigned int) length;
769  cur_marker->data_length = limit;
770  /* data area is just beyond the jpeg_marker_struct */
771  data = cur_marker->data = (JOCTET FAR *) (cur_marker + 1);
772  marker->cur_marker = cur_marker;
773  marker->bytes_read = 0;
774  bytes_read = 0;
775  data_length = limit;
776  } else {
777  /* deal with bogus length word */
778  bytes_read = data_length = 0;
779  data = NULL;
780  }
781  } else {
782  /* resume reading a marker */
783  bytes_read = marker->bytes_read;
784  data_length = cur_marker->data_length;
785  data = cur_marker->data + bytes_read;
786  }
787 
788  while (bytes_read < data_length) {
789  INPUT_SYNC(cinfo); /* move the restart point to here */
790  marker->bytes_read = bytes_read;
791  /* If there's not at least one byte in buffer, suspend */
792  MAKE_BYTE_AVAIL(cinfo, return FALSE);
793  /* Copy bytes with reasonable rapidity */
794  while (bytes_read < data_length && bytes_in_buffer > 0) {
795  *data++ = *next_input_byte++;
796  bytes_in_buffer--;
797  bytes_read++;
798  }
799  }
800 
801  /* Done reading what we want to read */
802  if (cur_marker != NULL) { /* will be NULL if bogus length word */
803  /* Add new marker to end of list */
804  if (cinfo->marker_list == NULL) {
805  cinfo->marker_list = cur_marker;
806  } else {
807  jpeg_saved_marker_ptr prev = cinfo->marker_list;
808  while (prev->next != NULL)
809  prev = prev->next;
810  prev->next = cur_marker;
811  }
812  /* Reset pointer & calc remaining data length */
813  data = cur_marker->data;
814  length = cur_marker->original_length - data_length;
815  }
816  /* Reset to initial state for next marker */
817  marker->cur_marker = NULL;
818 
819  /* Process the marker if interesting; else just make a generic trace msg */
820  switch (cinfo->unread_marker) {
821  case M_APP0:
822  examine_app0(cinfo, data, data_length, length);
823  break;
824  case M_APP14:
825  examine_app14(cinfo, data, data_length, length);
826  break;
827  default:
828  TRACEMS2(cinfo, 1, JTRC_MISC_MARKER, cinfo->unread_marker,
829  (int) (data_length + length));
830  break;
831  }
832 
833  /* skip any remaining data -- could be lots */
834  INPUT_SYNC(cinfo); /* do before skip_input_data */
835  if (length > 0)
836  (*cinfo->src->skip_input_data) (cinfo, (long) length);
837 
838  return TRUE;
839 }
840 
841 #endif /* SAVE_MARKERS_SUPPORTED */
842 
843 
844 METHODDEF(boolean)
846 /* Skip over an unknown or uninteresting variable-length marker */
847 {
848  INT32 length;
849  INPUT_VARS(cinfo);
850 
851  INPUT_2BYTES(cinfo, length, return FALSE);
852  length -= 2;
853 
854  TRACEMS2(cinfo, 1, JTRC_MISC_MARKER, cinfo->unread_marker, (int) length);
855 
856  INPUT_SYNC(cinfo); /* do before skip_input_data */
857  if (length > 0)
858  (*cinfo->src->skip_input_data) (cinfo, (long) length);
859 
860  return TRUE;
861 }
862 
863 
864 /*
865  * Find the next JPEG marker, save it in cinfo->unread_marker.
866  * Returns FALSE if had to suspend before reaching a marker;
867  * in that case cinfo->unread_marker is unchanged.
868  *
869  * Note that the result might not be a valid marker code,
870  * but it will never be 0 or FF.
871  */
872 
873 LOCAL(boolean)
875 {
876  int c;
877  INPUT_VARS(cinfo);
878 
879  for (;;) {
880  INPUT_BYTE(cinfo, c, return FALSE);
881  /* Skip any non-FF bytes.
882  * This may look a bit inefficient, but it will not occur in a valid file.
883  * We sync after each discarded byte so that a suspending data source
884  * can discard the byte from its buffer.
885  */
886  while (c != 0xFF) {
887  cinfo->marker->discarded_bytes++;
888  INPUT_SYNC(cinfo);
889  INPUT_BYTE(cinfo, c, return FALSE);
890  }
891  /* This loop swallows any duplicate FF bytes. Extra FFs are legal as
892  * pad bytes, so don't count them in discarded_bytes. We assume there
893  * will not be so many consecutive FF bytes as to overflow a suspending
894  * data source's input buffer.
895  */
896  do {
897  INPUT_BYTE(cinfo, c, return FALSE);
898  } while (c == 0xFF);
899  if (c != 0)
900  break; /* found a valid marker, exit loop */
901  /* Reach here if we found a stuffed-zero data sequence (FF/00).
902  * Discard it and loop back to try again.
903  */
904  cinfo->marker->discarded_bytes += 2;
905  INPUT_SYNC(cinfo);
906  }
907 
908  if (cinfo->marker->discarded_bytes != 0) {
909  WARNMS2(cinfo, JWRN_EXTRANEOUS_DATA, cinfo->marker->discarded_bytes, c);
910  cinfo->marker->discarded_bytes = 0;
911  }
912 
913  cinfo->unread_marker = c;
914 
915  INPUT_SYNC(cinfo);
916  return TRUE;
917 }
918 
919 
920 LOCAL(boolean)
922 /* Like next_marker, but used to obtain the initial SOI marker. */
923 /* For this marker, we do not allow preceding garbage or fill; otherwise,
924  * we might well scan an entire input file before realizing it ain't JPEG.
925  * If an application wants to process non-JFIF files, it must seek to the
926  * SOI before calling the JPEG library.
927  */
928 {
929  int c, c2;
930  INPUT_VARS(cinfo);
931 
932  INPUT_BYTE(cinfo, c, return FALSE);
933  INPUT_BYTE(cinfo, c2, return FALSE);
934  if (c != 0xFF || c2 != (int) M_SOI)
935  ERREXIT2(cinfo, JERR_NO_SOI, c, c2);
936 
937  cinfo->unread_marker = c2;
938 
939  INPUT_SYNC(cinfo);
940  return TRUE;
941 }
942 
943 
944 /*
945  * Read markers until SOS or EOI.
946  *
947  * Returns same codes as are defined for jpeg_consume_input:
948  * JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
949  */
950 
951 METHODDEF(int)
953 {
954  /* Outer loop repeats once for each marker. */
955  for (;;) {
956  /* Collect the marker proper, unless we already did. */
957  /* NB: first_marker() enforces the requirement that SOI appear first. */
958  if (cinfo->unread_marker == 0) {
959  if (! cinfo->marker->saw_SOI) {
960  if (! first_marker(cinfo))
961  return JPEG_SUSPENDED;
962  } else {
963  if (! next_marker(cinfo))
964  return JPEG_SUSPENDED;
965  }
966  }
967  /* At this point cinfo->unread_marker contains the marker code and the
968  * input point is just past the marker proper, but before any parameters.
969  * A suspension will cause us to return with this state still true.
970  */
971  switch (cinfo->unread_marker) {
972  case M_SOI:
973  if (! get_soi(cinfo))
974  return JPEG_SUSPENDED;
975  break;
976 
977  case M_SOF0: /* Baseline */
978  case M_SOF1: /* Extended sequential, Huffman */
979  if (! get_sof(cinfo, FALSE, FALSE))
980  return JPEG_SUSPENDED;
981  break;
982 
983  case M_SOF2: /* Progressive, Huffman */
984  if (! get_sof(cinfo, TRUE, FALSE))
985  return JPEG_SUSPENDED;
986  break;
987 
988  case M_SOF9: /* Extended sequential, arithmetic */
989  if (! get_sof(cinfo, FALSE, TRUE))
990  return JPEG_SUSPENDED;
991  break;
992 
993  case M_SOF10: /* Progressive, arithmetic */
994  if (! get_sof(cinfo, TRUE, TRUE))
995  return JPEG_SUSPENDED;
996  break;
997 
998  /* Currently unsupported SOFn types */
999  case M_SOF3: /* Lossless, Huffman */
1000  case M_SOF5: /* Differential sequential, Huffman */
1001  case M_SOF6: /* Differential progressive, Huffman */
1002  case M_SOF7: /* Differential lossless, Huffman */
1003  case M_JPG: /* Reserved for JPEG extensions */
1004  case M_SOF11: /* Lossless, arithmetic */
1005  case M_SOF13: /* Differential sequential, arithmetic */
1006  case M_SOF14: /* Differential progressive, arithmetic */
1007  case M_SOF15: /* Differential lossless, arithmetic */
1008  ERREXIT1(cinfo, JERR_SOF_UNSUPPORTED, cinfo->unread_marker);
1009  break;
1010 
1011  case M_SOS:
1012  if (! get_sos(cinfo))
1013  return JPEG_SUSPENDED;
1014  cinfo->unread_marker = 0; /* processed the marker */
1015  return JPEG_REACHED_SOS;
1016 
1017  case M_EOI:
1018  TRACEMS(cinfo, 1, JTRC_EOI);
1019  cinfo->unread_marker = 0; /* processed the marker */
1020  return JPEG_REACHED_EOI;
1021 
1022  case M_DAC:
1023  if (! get_dac(cinfo))
1024  return JPEG_SUSPENDED;
1025  break;
1026 
1027  case M_DHT:
1028  if (! get_dht(cinfo))
1029  return JPEG_SUSPENDED;
1030  break;
1031 
1032  case M_DQT:
1033  if (! get_dqt(cinfo))
1034  return JPEG_SUSPENDED;
1035  break;
1036 
1037  case M_DRI:
1038  if (! get_dri(cinfo))
1039  return JPEG_SUSPENDED;
1040  break;
1041 
1042  case M_APP0:
1043  case M_APP1:
1044  case M_APP2:
1045  case M_APP3:
1046  case M_APP4:
1047  case M_APP5:
1048  case M_APP6:
1049  case M_APP7:
1050  case M_APP8:
1051  case M_APP9:
1052  case M_APP10:
1053  case M_APP11:
1054  case M_APP12:
1055  case M_APP13:
1056  case M_APP14:
1057  case M_APP15:
1058  if (! (*((my_marker_ptr) cinfo->marker)->process_APPn[
1059  cinfo->unread_marker - (int) M_APP0]) (cinfo))
1060  return JPEG_SUSPENDED;
1061  break;
1062 
1063  case M_COM:
1064  if (! (*((my_marker_ptr) cinfo->marker)->process_COM) (cinfo))
1065  return JPEG_SUSPENDED;
1066  break;
1067 
1068  case M_RST0: /* these are all parameterless */
1069  case M_RST1:
1070  case M_RST2:
1071  case M_RST3:
1072  case M_RST4:
1073  case M_RST5:
1074  case M_RST6:
1075  case M_RST7:
1076  case M_TEM:
1077  TRACEMS1(cinfo, 1, JTRC_PARMLESS_MARKER, cinfo->unread_marker);
1078  break;
1079 
1080  case M_DNL: /* Ignore DNL ... perhaps the wrong thing */
1081  if (! skip_variable(cinfo))
1082  return JPEG_SUSPENDED;
1083  break;
1084 
1085  default: /* must be DHP, EXP, JPGn, or RESn */
1086  /* For now, we treat the reserved markers as fatal errors since they are
1087  * likely to be used to signal incompatible JPEG Part 3 extensions.
1088  * Once the JPEG 3 version-number marker is well defined, this code
1089  * ought to change!
1090  */
1091  ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo->unread_marker);
1092  break;
1093  }
1094  /* Successfully processed marker, so reset state variable */
1095  cinfo->unread_marker = 0;
1096  } /* end loop */
1097 }
1098 
1099 
1100 /*
1101  * Read a restart marker, which is expected to appear next in the datastream;
1102  * if the marker is not there, take appropriate recovery action.
1103  * Returns FALSE if suspension is required.
1104  *
1105  * This is called by the entropy decoder after it has read an appropriate
1106  * number of MCUs. cinfo->unread_marker may be nonzero if the entropy decoder
1107  * has already read a marker from the data source. Under normal conditions
1108  * cinfo->unread_marker will be reset to 0 before returning; if not reset,
1109  * it holds a marker which the decoder will be unable to read past.
1110  */
1111 
1112 METHODDEF(boolean)
1114 {
1115  /* Obtain a marker unless we already did. */
1116  /* Note that next_marker will complain if it skips any data. */
1117  if (cinfo->unread_marker == 0) {
1118  if (! next_marker(cinfo))
1119  return FALSE;
1120  }
1121 
1122  if (cinfo->unread_marker ==
1123  ((int) M_RST0 + cinfo->marker->next_restart_num)) {
1124  /* Normal case --- swallow the marker and let entropy decoder continue */
1125  TRACEMS1(cinfo, 3, JTRC_RST, cinfo->marker->next_restart_num);
1126  cinfo->unread_marker = 0;
1127  } else {
1128  /* Uh-oh, the restart markers have been messed up. */
1129  /* Let the data source manager determine how to resync. */
1130  if (! (*cinfo->src->resync_to_restart) (cinfo,
1131  cinfo->marker->next_restart_num))
1132  return FALSE;
1133  }
1134 
1135  /* Update next-restart state */
1136  cinfo->marker->next_restart_num = (cinfo->marker->next_restart_num + 1) & 7;
1137 
1138  return TRUE;
1139 }
1140 
1141 
1142 /*
1143  * This is the default resync_to_restart method for data source managers
1144  * to use if they don't have any better approach. Some data source managers
1145  * may be able to back up, or may have additional knowledge about the data
1146  * which permits a more intelligent recovery strategy; such managers would
1147  * presumably supply their own resync method.
1148  *
1149  * read_restart_marker calls resync_to_restart if it finds a marker other than
1150  * the restart marker it was expecting. (This code is *not* used unless
1151  * a nonzero restart interval has been declared.) cinfo->unread_marker is
1152  * the marker code actually found (might be anything, except 0 or FF).
1153  * The desired restart marker number (0..7) is passed as a parameter.
1154  * This routine is supposed to apply whatever error recovery strategy seems
1155  * appropriate in order to position the input stream to the next data segment.
1156  * Note that cinfo->unread_marker is treated as a marker appearing before
1157  * the current data-source input point; usually it should be reset to zero
1158  * before returning.
1159  * Returns FALSE if suspension is required.
1160  *
1161  * This implementation is substantially constrained by wanting to treat the
1162  * input as a data stream; this means we can't back up. Therefore, we have
1163  * only the following actions to work with:
1164  * 1. Simply discard the marker and let the entropy decoder resume at next
1165  * byte of file.
1166  * 2. Read forward until we find another marker, discarding intervening
1167  * data. (In theory we could look ahead within the current bufferload,
1168  * without having to discard data if we don't find the desired marker.
1169  * This idea is not implemented here, in part because it makes behavior
1170  * dependent on buffer size and chance buffer-boundary positions.)
1171  * 3. Leave the marker unread (by failing to zero cinfo->unread_marker).
1172  * This will cause the entropy decoder to process an empty data segment,
1173  * inserting dummy zeroes, and then we will reprocess the marker.
1174  *
1175  * #2 is appropriate if we think the desired marker lies ahead, while #3 is
1176  * appropriate if the found marker is a future restart marker (indicating
1177  * that we have missed the desired restart marker, probably because it got
1178  * corrupted).
1179  * We apply #2 or #3 if the found marker is a restart marker no more than
1180  * two counts behind or ahead of the expected one. We also apply #2 if the
1181  * found marker is not a legal JPEG marker code (it's certainly bogus data).
1182  * If the found marker is a restart marker more than 2 counts away, we do #1
1183  * (too much risk that the marker is erroneous; with luck we will be able to
1184  * resync at some future point).
1185  * For any valid non-restart JPEG marker, we apply #3. This keeps us from
1186  * overrunning the end of a scan. An implementation limited to single-scan
1187  * files might find it better to apply #2 for markers other than EOI, since
1188  * any other marker would have to be bogus data in that case.
1189  */
1190 
1191 GLOBAL(boolean)
1193 {
1194  int marker = cinfo->unread_marker;
1195  int action = 1;
1196 
1197  /* Always put up a warning. */
1198  WARNMS2(cinfo, JWRN_MUST_RESYNC, marker, desired);
1199 
1200  /* Outer loop handles repeated decision after scanning forward. */
1201  for (;;) {
1202  if (marker < (int) M_SOF0)
1203  action = 2; /* invalid marker */
1204  else if (marker < (int) M_RST0 || marker > (int) M_RST7)
1205  action = 3; /* valid non-restart marker */
1206  else {
1207  if (marker == ((int) M_RST0 + ((desired+1) & 7)) ||
1208  marker == ((int) M_RST0 + ((desired+2) & 7)))
1209  action = 3; /* one of the next two expected restarts */
1210  else if (marker == ((int) M_RST0 + ((desired-1) & 7)) ||
1211  marker == ((int) M_RST0 + ((desired-2) & 7)))
1212  action = 2; /* a prior restart, so advance */
1213  else
1214  action = 1; /* desired restart or too far away */
1215  }
1216  TRACEMS2(cinfo, 4, JTRC_RECOVERY_ACTION, marker, action);
1217  switch (action) {
1218  case 1:
1219  /* Discard marker and let entropy decoder resume processing. */
1220  cinfo->unread_marker = 0;
1221  return TRUE;
1222  case 2:
1223  /* Scan to the next marker, and repeat the decision loop. */
1224  if (! next_marker(cinfo))
1225  return FALSE;
1226  marker = cinfo->unread_marker;
1227  break;
1228  case 3:
1229  /* Return without advancing past this marker. */
1230  /* Entropy decoder will be forced to process an empty segment. */
1231  return TRUE;
1232  }
1233  } /* end loop */
1234 }
1235 
1236 
1237 /*
1238  * Reset marker processing state to begin a fresh datastream.
1239  */
1240 
1241 METHODDEF(void)
1243 {
1244  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
1245 
1246  cinfo->comp_info = NULL; /* until allocated by get_sof */
1247  cinfo->input_scan_number = 0; /* no SOS seen yet */
1248  cinfo->unread_marker = 0; /* no pending marker */
1249  marker->pub.saw_SOI = FALSE; /* set internal state too */
1250  marker->pub.saw_SOF = FALSE;
1251  marker->pub.discarded_bytes = 0;
1252  marker->cur_marker = NULL;
1253 }
1254 
1255 
1256 /*
1257  * Initialize the marker reader module.
1258  * This is called only once, when the decompression object is created.
1259  */
1260 
1261 GLOBAL(void)
1263 {
1265  int i;
1266 
1267  /* Create subobject in permanent pool */
1268  marker = (my_marker_ptr)
1269  (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
1271  cinfo->marker = (struct jpeg_marker_reader *) marker;
1272  /* Initialize public method pointers */
1273  marker->pub.reset_marker_reader = reset_marker_reader;
1274  marker->pub.read_markers = read_markers;
1275  marker->pub.read_restart_marker = read_restart_marker;
1276  /* Initialize COM/APPn processing.
1277  * By default, we examine and then discard APP0 and APP14,
1278  * but simply discard COM and all other APPn.
1279  */
1280  marker->process_COM = skip_variable;
1281  marker->length_limit_COM = 0;
1282  for (i = 0; i < 16; i++) {
1283  marker->process_APPn[i] = skip_variable;
1284  marker->length_limit_APPn[i] = 0;
1285  }
1286  marker->process_APPn[0] = get_interesting_appn;
1287  marker->process_APPn[14] = get_interesting_appn;
1288  /* Reset marker processing state */
1289  reset_marker_reader(cinfo);
1290 }
1291 
1292 
1293 /*
1294  * Control saving of COM and APPn markers into marker_list.
1295  */
1296 
1297 #ifdef SAVE_MARKERS_SUPPORTED
1298 
1299 GLOBAL(void)
1301  unsigned int length_limit)
1302 {
1303  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
1304  long maxlength;
1305  jpeg_marker_parser_method processor;
1306 
1307  /* Length limit mustn't be larger than what we can allocate
1308  * (should only be a concern in a 16-bit environment).
1309  */
1310  maxlength = cinfo->mem->max_alloc_chunk - SIZEOF(struct jpeg_marker_struct);
1311  if (((long) length_limit) > maxlength)
1312  length_limit = (unsigned int) maxlength;
1313 
1314  /* Choose processor routine to use.
1315  * APP0/APP14 have special requirements.
1316  */
1317  if (length_limit) {
1318  processor = save_marker;
1319  /* If saving APP0/APP14, save at least enough for our internal use. */
1320  if (marker_code == (int) M_APP0 && length_limit < APP0_DATA_LEN)
1322  else if (marker_code == (int) M_APP14 && length_limit < APP14_DATA_LEN)
1324  } else {
1325  processor = skip_variable;
1326  /* If discarding APP0/APP14, use our regular on-the-fly processor. */
1327  if (marker_code == (int) M_APP0 || marker_code == (int) M_APP14)
1328  processor = get_interesting_appn;
1329  }
1330 
1331  if (marker_code == (int) M_COM) {
1332  marker->process_COM = processor;
1333  marker->length_limit_COM = length_limit;
1334  } else if (marker_code >= (int) M_APP0 && marker_code <= (int) M_APP15) {
1335  marker->process_APPn[marker_code - (int) M_APP0] = processor;
1336  marker->length_limit_APPn[marker_code - (int) M_APP0] = length_limit;
1337  } else
1338  ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, marker_code);
1339 }
1340 
1341 #endif /* SAVE_MARKERS_SUPPORTED */
1342 
1343 
1344 /*
1345  * Install a special processing method for COM or APPn markers.
1346  */
1347 
1348 GLOBAL(void)
1350  jpeg_marker_parser_method routine)
1351 {
1352  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
1353 
1354  if (marker_code == (int) M_COM)
1355  marker->process_COM = routine;
1356  else if (marker_code >= (int) M_APP0 && marker_code <= (int) M_APP15)
1357  marker->process_APPn[marker_code - (int) M_APP0] = routine;
1358  else
1359  ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, marker_code);
1360 }
#define APP14_DATA_LEN
Definition: jdmarker.c:579
int c
Definition: autoplay.py:16
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Definition: jdmarker.c:107
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Definition: jmorecfg.h:119
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Definition: jdmarker.c:30
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Definition: jdmarker.c:921
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Definition: jcomapi.c:98
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Definition: OPC_IceHook.h:13
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Definition: jdmarker.c:548
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Definition: jdmarker.c:1300
Definition: jdmarker.c:82
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Definition: jdmarker.c:845
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Definition: jdmarker.c:739
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Definition: jdmarker.c:1192
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Definition: jdmarker.c:1349
Definition: jdmarker.c:58
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Definition: jpeglib.h:1011
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Definition: jcomapi.c:86
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openhrp3
Author(s): AIST, General Robotix Inc., Nakamura Lab of Dept. of Mechano Informatics at University of Tokyo
autogenerated on Thu Sep 8 2022 02:24:04