source: rtems-graphics-toolkit/jpeg-8d/jcmarker.c @ 86b99f7

Last change on this file since 86b99f7 was 86b99f7, checked in by Alexandru-Sever Horin <alex.sever.h@…>, on Aug 1, 2012 at 10:40:32 PM

Added jpeg-8d version. Made modifications to compile for RTEMS, without man or binaries

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1/*
2 * jcmarker.c
3 *
4 * Copyright (C) 1991-1998, Thomas G. Lane.
5 * Modified 2003-2010 by Guido Vollbeding.
6 * This file is part of the Independent JPEG Group's software.
7 * For conditions of distribution and use, see the accompanying README file.
8 *
9 * This file contains routines to write JPEG datastream markers.
10 */
11
12#define JPEG_INTERNALS
13#include "jinclude.h"
14#include "jpeglib.h"
15
16
17typedef enum {                  /* JPEG marker codes */
18  M_SOF0  = 0xc0,
19  M_SOF1  = 0xc1,
20  M_SOF2  = 0xc2,
21  M_SOF3  = 0xc3,
22 
23  M_SOF5  = 0xc5,
24  M_SOF6  = 0xc6,
25  M_SOF7  = 0xc7,
26 
27  M_JPG   = 0xc8,
28  M_SOF9  = 0xc9,
29  M_SOF10 = 0xca,
30  M_SOF11 = 0xcb,
31 
32  M_SOF13 = 0xcd,
33  M_SOF14 = 0xce,
34  M_SOF15 = 0xcf,
35 
36  M_DHT   = 0xc4,
37 
38  M_DAC   = 0xcc,
39 
40  M_RST0  = 0xd0,
41  M_RST1  = 0xd1,
42  M_RST2  = 0xd2,
43  M_RST3  = 0xd3,
44  M_RST4  = 0xd4,
45  M_RST5  = 0xd5,
46  M_RST6  = 0xd6,
47  M_RST7  = 0xd7,
48 
49  M_SOI   = 0xd8,
50  M_EOI   = 0xd9,
51  M_SOS   = 0xda,
52  M_DQT   = 0xdb,
53  M_DNL   = 0xdc,
54  M_DRI   = 0xdd,
55  M_DHP   = 0xde,
56  M_EXP   = 0xdf,
57 
58  M_APP0  = 0xe0,
59  M_APP1  = 0xe1,
60  M_APP2  = 0xe2,
61  M_APP3  = 0xe3,
62  M_APP4  = 0xe4,
63  M_APP5  = 0xe5,
64  M_APP6  = 0xe6,
65  M_APP7  = 0xe7,
66  M_APP8  = 0xe8,
67  M_APP9  = 0xe9,
68  M_APP10 = 0xea,
69  M_APP11 = 0xeb,
70  M_APP12 = 0xec,
71  M_APP13 = 0xed,
72  M_APP14 = 0xee,
73  M_APP15 = 0xef,
74 
75  M_JPG0  = 0xf0,
76  M_JPG13 = 0xfd,
77  M_COM   = 0xfe,
78 
79  M_TEM   = 0x01,
80 
81  M_ERROR = 0x100
82} JPEG_MARKER;
83
84
85/* Private state */
86
87typedef struct {
88  struct jpeg_marker_writer pub; /* public fields */
89
90  unsigned int last_restart_interval; /* last DRI value emitted; 0 after SOI */
91} my_marker_writer;
92
93typedef my_marker_writer * my_marker_ptr;
94
95
96/*
97 * Basic output routines.
98 *
99 * Note that we do not support suspension while writing a marker.
100 * Therefore, an application using suspension must ensure that there is
101 * enough buffer space for the initial markers (typ. 600-700 bytes) before
102 * calling jpeg_start_compress, and enough space to write the trailing EOI
103 * (a few bytes) before calling jpeg_finish_compress.  Multipass compression
104 * modes are not supported at all with suspension, so those two are the only
105 * points where markers will be written.
106 */
107
108LOCAL(void)
109emit_byte (j_compress_ptr cinfo, int val)
110/* Emit a byte */
111{
112  struct jpeg_destination_mgr * dest = cinfo->dest;
113
114  *(dest->next_output_byte)++ = (JOCTET) val;
115  if (--dest->free_in_buffer == 0) {
116    if (! (*dest->empty_output_buffer) (cinfo))
117      ERREXIT(cinfo, JERR_CANT_SUSPEND);
118  }
119}
120
121
122LOCAL(void)
123emit_marker (j_compress_ptr cinfo, JPEG_MARKER mark)
124/* Emit a marker code */
125{
126  emit_byte(cinfo, 0xFF);
127  emit_byte(cinfo, (int) mark);
128}
129
130
131LOCAL(void)
132emit_2bytes (j_compress_ptr cinfo, int value)
133/* Emit a 2-byte integer; these are always MSB first in JPEG files */
134{
135  emit_byte(cinfo, (value >> 8) & 0xFF);
136  emit_byte(cinfo, value & 0xFF);
137}
138
139
140/*
141 * Routines to write specific marker types.
142 */
143
144LOCAL(int)
145emit_dqt (j_compress_ptr cinfo, int index)
146/* Emit a DQT marker */
147/* Returns the precision used (0 = 8bits, 1 = 16bits) for baseline checking */
148{
149  JQUANT_TBL * qtbl = cinfo->quant_tbl_ptrs[index];
150  int prec;
151  int i;
152
153  if (qtbl == NULL)
154    ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, index);
155
156  prec = 0;
157  for (i = 0; i <= cinfo->lim_Se; i++) {
158    if (qtbl->quantval[cinfo->natural_order[i]] > 255)
159      prec = 1;
160  }
161
162  if (! qtbl->sent_table) {
163    emit_marker(cinfo, M_DQT);
164
165    emit_2bytes(cinfo,
166      prec ? cinfo->lim_Se * 2 + 2 + 1 + 2 : cinfo->lim_Se + 1 + 1 + 2);
167
168    emit_byte(cinfo, index + (prec<<4));
169
170    for (i = 0; i <= cinfo->lim_Se; i++) {
171      /* The table entries must be emitted in zigzag order. */
172      unsigned int qval = qtbl->quantval[cinfo->natural_order[i]];
173      if (prec)
174        emit_byte(cinfo, (int) (qval >> 8));
175      emit_byte(cinfo, (int) (qval & 0xFF));
176    }
177
178    qtbl->sent_table = TRUE;
179  }
180
181  return prec;
182}
183
184
185LOCAL(void)
186emit_dht (j_compress_ptr cinfo, int index, boolean is_ac)
187/* Emit a DHT marker */
188{
189  JHUFF_TBL * htbl;
190  int length, i;
191 
192  if (is_ac) {
193    htbl = cinfo->ac_huff_tbl_ptrs[index];
194    index += 0x10;              /* output index has AC bit set */
195  } else {
196    htbl = cinfo->dc_huff_tbl_ptrs[index];
197  }
198
199  if (htbl == NULL)
200    ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, index);
201 
202  if (! htbl->sent_table) {
203    emit_marker(cinfo, M_DHT);
204   
205    length = 0;
206    for (i = 1; i <= 16; i++)
207      length += htbl->bits[i];
208   
209    emit_2bytes(cinfo, length + 2 + 1 + 16);
210    emit_byte(cinfo, index);
211   
212    for (i = 1; i <= 16; i++)
213      emit_byte(cinfo, htbl->bits[i]);
214   
215    for (i = 0; i < length; i++)
216      emit_byte(cinfo, htbl->huffval[i]);
217   
218    htbl->sent_table = TRUE;
219  }
220}
221
222
223LOCAL(void)
224emit_dac (j_compress_ptr cinfo)
225/* Emit a DAC marker */
226/* Since the useful info is so small, we want to emit all the tables in */
227/* one DAC marker.  Therefore this routine does its own scan of the table. */
228{
229#ifdef C_ARITH_CODING_SUPPORTED
230  char dc_in_use[NUM_ARITH_TBLS];
231  char ac_in_use[NUM_ARITH_TBLS];
232  int length, i;
233  jpeg_component_info *compptr;
234
235  for (i = 0; i < NUM_ARITH_TBLS; i++)
236    dc_in_use[i] = ac_in_use[i] = 0;
237
238  for (i = 0; i < cinfo->comps_in_scan; i++) {
239    compptr = cinfo->cur_comp_info[i];
240    /* DC needs no table for refinement scan */
241    if (cinfo->Ss == 0 && cinfo->Ah == 0)
242      dc_in_use[compptr->dc_tbl_no] = 1;
243    /* AC needs no table when not present */
244    if (cinfo->Se)
245      ac_in_use[compptr->ac_tbl_no] = 1;
246  }
247
248  length = 0;
249  for (i = 0; i < NUM_ARITH_TBLS; i++)
250    length += dc_in_use[i] + ac_in_use[i];
251
252  if (length) {
253    emit_marker(cinfo, M_DAC);
254
255    emit_2bytes(cinfo, length*2 + 2);
256
257    for (i = 0; i < NUM_ARITH_TBLS; i++) {
258      if (dc_in_use[i]) {
259        emit_byte(cinfo, i);
260        emit_byte(cinfo, cinfo->arith_dc_L[i] + (cinfo->arith_dc_U[i]<<4));
261      }
262      if (ac_in_use[i]) {
263        emit_byte(cinfo, i + 0x10);
264        emit_byte(cinfo, cinfo->arith_ac_K[i]);
265      }
266    }
267  }
268#endif /* C_ARITH_CODING_SUPPORTED */
269}
270
271
272LOCAL(void)
273emit_dri (j_compress_ptr cinfo)
274/* Emit a DRI marker */
275{
276  emit_marker(cinfo, M_DRI);
277 
278  emit_2bytes(cinfo, 4);        /* fixed length */
279
280  emit_2bytes(cinfo, (int) cinfo->restart_interval);
281}
282
283
284LOCAL(void)
285emit_sof (j_compress_ptr cinfo, JPEG_MARKER code)
286/* Emit a SOF marker */
287{
288  int ci;
289  jpeg_component_info *compptr;
290 
291  emit_marker(cinfo, code);
292 
293  emit_2bytes(cinfo, 3 * cinfo->num_components + 2 + 5 + 1); /* length */
294
295  /* Make sure image isn't bigger than SOF field can handle */
296  if ((long) cinfo->jpeg_height > 65535L ||
297      (long) cinfo->jpeg_width > 65535L)
298    ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) 65535);
299
300  emit_byte(cinfo, cinfo->data_precision);
301  emit_2bytes(cinfo, (int) cinfo->jpeg_height);
302  emit_2bytes(cinfo, (int) cinfo->jpeg_width);
303
304  emit_byte(cinfo, cinfo->num_components);
305
306  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
307       ci++, compptr++) {
308    emit_byte(cinfo, compptr->component_id);
309    emit_byte(cinfo, (compptr->h_samp_factor << 4) + compptr->v_samp_factor);
310    emit_byte(cinfo, compptr->quant_tbl_no);
311  }
312}
313
314
315LOCAL(void)
316emit_sos (j_compress_ptr cinfo)
317/* Emit a SOS marker */
318{
319  int i, td, ta;
320  jpeg_component_info *compptr;
321 
322  emit_marker(cinfo, M_SOS);
323 
324  emit_2bytes(cinfo, 2 * cinfo->comps_in_scan + 2 + 1 + 3); /* length */
325 
326  emit_byte(cinfo, cinfo->comps_in_scan);
327 
328  for (i = 0; i < cinfo->comps_in_scan; i++) {
329    compptr = cinfo->cur_comp_info[i];
330    emit_byte(cinfo, compptr->component_id);
331
332    /* We emit 0 for unused field(s); this is recommended by the P&M text
333     * but does not seem to be specified in the standard.
334     */
335
336    /* DC needs no table for refinement scan */
337    td = cinfo->Ss == 0 && cinfo->Ah == 0 ? compptr->dc_tbl_no : 0;
338    /* AC needs no table when not present */
339    ta = cinfo->Se ? compptr->ac_tbl_no : 0;
340
341    emit_byte(cinfo, (td << 4) + ta);
342  }
343
344  emit_byte(cinfo, cinfo->Ss);
345  emit_byte(cinfo, cinfo->Se);
346  emit_byte(cinfo, (cinfo->Ah << 4) + cinfo->Al);
347}
348
349
350LOCAL(void)
351emit_pseudo_sos (j_compress_ptr cinfo)
352/* Emit a pseudo SOS marker */
353{
354  emit_marker(cinfo, M_SOS);
355 
356  emit_2bytes(cinfo, 2 + 1 + 3); /* length */
357 
358  emit_byte(cinfo, 0); /* Ns */
359
360  emit_byte(cinfo, 0); /* Ss */
361  emit_byte(cinfo, cinfo->block_size * cinfo->block_size - 1); /* Se */
362  emit_byte(cinfo, 0); /* Ah/Al */
363}
364
365
366LOCAL(void)
367emit_jfif_app0 (j_compress_ptr cinfo)
368/* Emit a JFIF-compliant APP0 marker */
369{
370  /*
371   * Length of APP0 block       (2 bytes)
372   * Block ID                   (4 bytes - ASCII "JFIF")
373   * Zero byte                  (1 byte to terminate the ID string)
374   * Version Major, Minor       (2 bytes - major first)
375   * Units                      (1 byte - 0x00 = none, 0x01 = inch, 0x02 = cm)
376   * Xdpu                       (2 bytes - dots per unit horizontal)
377   * Ydpu                       (2 bytes - dots per unit vertical)
378   * Thumbnail X size           (1 byte)
379   * Thumbnail Y size           (1 byte)
380   */
381 
382  emit_marker(cinfo, M_APP0);
383 
384  emit_2bytes(cinfo, 2 + 4 + 1 + 2 + 1 + 2 + 2 + 1 + 1); /* length */
385
386  emit_byte(cinfo, 0x4A);       /* Identifier: ASCII "JFIF" */
387  emit_byte(cinfo, 0x46);
388  emit_byte(cinfo, 0x49);
389  emit_byte(cinfo, 0x46);
390  emit_byte(cinfo, 0);
391  emit_byte(cinfo, cinfo->JFIF_major_version); /* Version fields */
392  emit_byte(cinfo, cinfo->JFIF_minor_version);
393  emit_byte(cinfo, cinfo->density_unit); /* Pixel size information */
394  emit_2bytes(cinfo, (int) cinfo->X_density);
395  emit_2bytes(cinfo, (int) cinfo->Y_density);
396  emit_byte(cinfo, 0);          /* No thumbnail image */
397  emit_byte(cinfo, 0);
398}
399
400
401LOCAL(void)
402emit_adobe_app14 (j_compress_ptr cinfo)
403/* Emit an Adobe APP14 marker */
404{
405  /*
406   * Length of APP14 block      (2 bytes)
407   * Block ID                   (5 bytes - ASCII "Adobe")
408   * Version Number             (2 bytes - currently 100)
409   * Flags0                     (2 bytes - currently 0)
410   * Flags1                     (2 bytes - currently 0)
411   * Color transform            (1 byte)
412   *
413   * Although Adobe TN 5116 mentions Version = 101, all the Adobe files
414   * now in circulation seem to use Version = 100, so that's what we write.
415   *
416   * We write the color transform byte as 1 if the JPEG color space is
417   * YCbCr, 2 if it's YCCK, 0 otherwise.  Adobe's definition has to do with
418   * whether the encoder performed a transformation, which is pretty useless.
419   */
420 
421  emit_marker(cinfo, M_APP14);
422 
423  emit_2bytes(cinfo, 2 + 5 + 2 + 2 + 2 + 1); /* length */
424
425  emit_byte(cinfo, 0x41);       /* Identifier: ASCII "Adobe" */
426  emit_byte(cinfo, 0x64);
427  emit_byte(cinfo, 0x6F);
428  emit_byte(cinfo, 0x62);
429  emit_byte(cinfo, 0x65);
430  emit_2bytes(cinfo, 100);      /* Version */
431  emit_2bytes(cinfo, 0);        /* Flags0 */
432  emit_2bytes(cinfo, 0);        /* Flags1 */
433  switch (cinfo->jpeg_color_space) {
434  case JCS_YCbCr:
435    emit_byte(cinfo, 1);        /* Color transform = 1 */
436    break;
437  case JCS_YCCK:
438    emit_byte(cinfo, 2);        /* Color transform = 2 */
439    break;
440  default:
441    emit_byte(cinfo, 0);        /* Color transform = 0 */
442    break;
443  }
444}
445
446
447/*
448 * These routines allow writing an arbitrary marker with parameters.
449 * The only intended use is to emit COM or APPn markers after calling
450 * write_file_header and before calling write_frame_header.
451 * Other uses are not guaranteed to produce desirable results.
452 * Counting the parameter bytes properly is the caller's responsibility.
453 */
454
455METHODDEF(void)
456write_marker_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
457/* Emit an arbitrary marker header */
458{
459  if (datalen > (unsigned int) 65533)           /* safety check */
460    ERREXIT(cinfo, JERR_BAD_LENGTH);
461
462  emit_marker(cinfo, (JPEG_MARKER) marker);
463
464  emit_2bytes(cinfo, (int) (datalen + 2));      /* total length */
465}
466
467METHODDEF(void)
468write_marker_byte (j_compress_ptr cinfo, int val)
469/* Emit one byte of marker parameters following write_marker_header */
470{
471  emit_byte(cinfo, val);
472}
473
474
475/*
476 * Write datastream header.
477 * This consists of an SOI and optional APPn markers.
478 * We recommend use of the JFIF marker, but not the Adobe marker,
479 * when using YCbCr or grayscale data.  The JFIF marker should NOT
480 * be used for any other JPEG colorspace.  The Adobe marker is helpful
481 * to distinguish RGB, CMYK, and YCCK colorspaces.
482 * Note that an application can write additional header markers after
483 * jpeg_start_compress returns.
484 */
485
486METHODDEF(void)
487write_file_header (j_compress_ptr cinfo)
488{
489  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
490
491  emit_marker(cinfo, M_SOI);    /* first the SOI */
492
493  /* SOI is defined to reset restart interval to 0 */
494  marker->last_restart_interval = 0;
495
496  if (cinfo->write_JFIF_header) /* next an optional JFIF APP0 */
497    emit_jfif_app0(cinfo);
498  if (cinfo->write_Adobe_marker) /* next an optional Adobe APP14 */
499    emit_adobe_app14(cinfo);
500}
501
502
503/*
504 * Write frame header.
505 * This consists of DQT and SOFn markers, and a conditional pseudo SOS marker.
506 * Note that we do not emit the SOF until we have emitted the DQT(s).
507 * This avoids compatibility problems with incorrect implementations that
508 * try to error-check the quant table numbers as soon as they see the SOF.
509 */
510
511METHODDEF(void)
512write_frame_header (j_compress_ptr cinfo)
513{
514  int ci, prec;
515  boolean is_baseline;
516  jpeg_component_info *compptr;
517 
518  /* Emit DQT for each quantization table.
519   * Note that emit_dqt() suppresses any duplicate tables.
520   */
521  prec = 0;
522  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
523       ci++, compptr++) {
524    prec += emit_dqt(cinfo, compptr->quant_tbl_no);
525  }
526  /* now prec is nonzero iff there are any 16-bit quant tables. */
527
528  /* Check for a non-baseline specification.
529   * Note we assume that Huffman table numbers won't be changed later.
530   */
531  if (cinfo->arith_code || cinfo->progressive_mode ||
532      cinfo->data_precision != 8 || cinfo->block_size != DCTSIZE) {
533    is_baseline = FALSE;
534  } else {
535    is_baseline = TRUE;
536    for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
537         ci++, compptr++) {
538      if (compptr->dc_tbl_no > 1 || compptr->ac_tbl_no > 1)
539        is_baseline = FALSE;
540    }
541    if (prec && is_baseline) {
542      is_baseline = FALSE;
543      /* If it's baseline except for quantizer size, warn the user */
544      TRACEMS(cinfo, 0, JTRC_16BIT_TABLES);
545    }
546  }
547
548  /* Emit the proper SOF marker */
549  if (cinfo->arith_code) {
550    if (cinfo->progressive_mode)
551      emit_sof(cinfo, M_SOF10); /* SOF code for progressive arithmetic */
552    else
553      emit_sof(cinfo, M_SOF9);  /* SOF code for sequential arithmetic */
554  } else {
555    if (cinfo->progressive_mode)
556      emit_sof(cinfo, M_SOF2);  /* SOF code for progressive Huffman */
557    else if (is_baseline)
558      emit_sof(cinfo, M_SOF0);  /* SOF code for baseline implementation */
559    else
560      emit_sof(cinfo, M_SOF1);  /* SOF code for non-baseline Huffman file */
561  }
562
563  /* Check to emit pseudo SOS marker */
564  if (cinfo->progressive_mode && cinfo->block_size != DCTSIZE)
565    emit_pseudo_sos(cinfo);
566}
567
568
569/*
570 * Write scan header.
571 * This consists of DHT or DAC markers, optional DRI, and SOS.
572 * Compressed data will be written following the SOS.
573 */
574
575METHODDEF(void)
576write_scan_header (j_compress_ptr cinfo)
577{
578  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
579  int i;
580  jpeg_component_info *compptr;
581
582  if (cinfo->arith_code) {
583    /* Emit arith conditioning info.  We may have some duplication
584     * if the file has multiple scans, but it's so small it's hardly
585     * worth worrying about.
586     */
587    emit_dac(cinfo);
588  } else {
589    /* Emit Huffman tables.
590     * Note that emit_dht() suppresses any duplicate tables.
591     */
592    for (i = 0; i < cinfo->comps_in_scan; i++) {
593      compptr = cinfo->cur_comp_info[i];
594      /* DC needs no table for refinement scan */
595      if (cinfo->Ss == 0 && cinfo->Ah == 0)
596        emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
597      /* AC needs no table when not present */
598      if (cinfo->Se)
599        emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
600    }
601  }
602
603  /* Emit DRI if required --- note that DRI value could change for each scan.
604   * We avoid wasting space with unnecessary DRIs, however.
605   */
606  if (cinfo->restart_interval != marker->last_restart_interval) {
607    emit_dri(cinfo);
608    marker->last_restart_interval = cinfo->restart_interval;
609  }
610
611  emit_sos(cinfo);
612}
613
614
615/*
616 * Write datastream trailer.
617 */
618
619METHODDEF(void)
620write_file_trailer (j_compress_ptr cinfo)
621{
622  emit_marker(cinfo, M_EOI);
623}
624
625
626/*
627 * Write an abbreviated table-specification datastream.
628 * This consists of SOI, DQT and DHT tables, and EOI.
629 * Any table that is defined and not marked sent_table = TRUE will be
630 * emitted.  Note that all tables will be marked sent_table = TRUE at exit.
631 */
632
633METHODDEF(void)
634write_tables_only (j_compress_ptr cinfo)
635{
636  int i;
637
638  emit_marker(cinfo, M_SOI);
639
640  for (i = 0; i < NUM_QUANT_TBLS; i++) {
641    if (cinfo->quant_tbl_ptrs[i] != NULL)
642      (void) emit_dqt(cinfo, i);
643  }
644
645  if (! cinfo->arith_code) {
646    for (i = 0; i < NUM_HUFF_TBLS; i++) {
647      if (cinfo->dc_huff_tbl_ptrs[i] != NULL)
648        emit_dht(cinfo, i, FALSE);
649      if (cinfo->ac_huff_tbl_ptrs[i] != NULL)
650        emit_dht(cinfo, i, TRUE);
651    }
652  }
653
654  emit_marker(cinfo, M_EOI);
655}
656
657
658/*
659 * Initialize the marker writer module.
660 */
661
662GLOBAL(void)
663jinit_marker_writer (j_compress_ptr cinfo)
664{
665  my_marker_ptr marker;
666
667  /* Create the subobject */
668  marker = (my_marker_ptr)
669    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
670                                SIZEOF(my_marker_writer));
671  cinfo->marker = (struct jpeg_marker_writer *) marker;
672  /* Initialize method pointers */
673  marker->pub.write_file_header = write_file_header;
674  marker->pub.write_frame_header = write_frame_header;
675  marker->pub.write_scan_header = write_scan_header;
676  marker->pub.write_file_trailer = write_file_trailer;
677  marker->pub.write_tables_only = write_tables_only;
678  marker->pub.write_marker_header = write_marker_header;
679  marker->pub.write_marker_byte = write_marker_byte;
680  /* Initialize private state */
681  marker->last_restart_interval = 0;
682}
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