Coverage Report

Created: 2024-07-27 06:27

/src/libjpeg-turbo/jcmarker.c
Line
Count
Source (jump to first uncovered line)
1
/*
2
 * jcmarker.c
3
 *
4
 * This file was part of the Independent JPEG Group's software:
5
 * Copyright (C) 1991-1998, Thomas G. Lane.
6
 * Modified 2003-2010 by Guido Vollbeding.
7
 * Lossless JPEG Modifications:
8
 * Copyright (C) 1999, Ken Murchison.
9
 * libjpeg-turbo Modifications:
10
 * Copyright (C) 2010, 2022, D. R. Commander.
11
 * For conditions of distribution and use, see the accompanying README.ijg
12
 * file.
13
 *
14
 * This file contains routines to write JPEG datastream markers.
15
 */
16
17
#define JPEG_INTERNALS
18
#include "jinclude.h"
19
#include "jpeglib.h"
20
#include "jpegapicomp.h"
21
22
23
typedef enum {                  /* JPEG marker codes */
24
  M_SOF0  = 0xc0,
25
  M_SOF1  = 0xc1,
26
  M_SOF2  = 0xc2,
27
  M_SOF3  = 0xc3,
28
29
  M_SOF5  = 0xc5,
30
  M_SOF6  = 0xc6,
31
  M_SOF7  = 0xc7,
32
33
  M_JPG   = 0xc8,
34
  M_SOF9  = 0xc9,
35
  M_SOF10 = 0xca,
36
  M_SOF11 = 0xcb,
37
38
  M_SOF13 = 0xcd,
39
  M_SOF14 = 0xce,
40
  M_SOF15 = 0xcf,
41
42
  M_DHT   = 0xc4,
43
44
  M_DAC   = 0xcc,
45
46
  M_RST0  = 0xd0,
47
  M_RST1  = 0xd1,
48
  M_RST2  = 0xd2,
49
  M_RST3  = 0xd3,
50
  M_RST4  = 0xd4,
51
  M_RST5  = 0xd5,
52
  M_RST6  = 0xd6,
53
  M_RST7  = 0xd7,
54
55
  M_SOI   = 0xd8,
56
  M_EOI   = 0xd9,
57
  M_SOS   = 0xda,
58
  M_DQT   = 0xdb,
59
  M_DNL   = 0xdc,
60
  M_DRI   = 0xdd,
61
  M_DHP   = 0xde,
62
  M_EXP   = 0xdf,
63
64
  M_APP0  = 0xe0,
65
  M_APP1  = 0xe1,
66
  M_APP2  = 0xe2,
67
  M_APP3  = 0xe3,
68
  M_APP4  = 0xe4,
69
  M_APP5  = 0xe5,
70
  M_APP6  = 0xe6,
71
  M_APP7  = 0xe7,
72
  M_APP8  = 0xe8,
73
  M_APP9  = 0xe9,
74
  M_APP10 = 0xea,
75
  M_APP11 = 0xeb,
76
  M_APP12 = 0xec,
77
  M_APP13 = 0xed,
78
  M_APP14 = 0xee,
79
  M_APP15 = 0xef,
80
81
  M_JPG0  = 0xf0,
82
  M_JPG13 = 0xfd,
83
  M_COM   = 0xfe,
84
85
  M_TEM   = 0x01,
86
87
  M_ERROR = 0x100
88
} JPEG_MARKER;
89
90
91
/* Private state */
92
93
typedef struct {
94
  struct jpeg_marker_writer pub; /* public fields */
95
96
  unsigned int last_restart_interval; /* last DRI value emitted; 0 after SOI */
97
} my_marker_writer;
98
99
typedef my_marker_writer *my_marker_ptr;
100
101
102
/*
103
 * Basic output routines.
104
 *
105
 * Note that we do not support suspension while writing a marker.
106
 * Therefore, an application using suspension must ensure that there is
107
 * enough buffer space for the initial markers (typ. 600-700 bytes) before
108
 * calling jpeg_start_compress, and enough space to write the trailing EOI
109
 * (a few bytes) before calling jpeg_finish_compress.  Multipass compression
110
 * modes are not supported at all with suspension, so those two are the only
111
 * points where markers will be written.
112
 */
113
114
LOCAL(void)
115
emit_byte(j_compress_ptr cinfo, int val)
116
/* Emit a byte */
117
0
{
118
0
  struct jpeg_destination_mgr *dest = cinfo->dest;
119
120
0
  *(dest->next_output_byte)++ = (JOCTET)val;
121
0
  if (--dest->free_in_buffer == 0) {
122
0
    if (!(*dest->empty_output_buffer) (cinfo))
123
0
      ERREXIT(cinfo, JERR_CANT_SUSPEND);
124
0
  }
125
0
}
126
127
128
LOCAL(void)
129
emit_marker(j_compress_ptr cinfo, JPEG_MARKER mark)
130
/* Emit a marker code */
131
0
{
132
0
  emit_byte(cinfo, 0xFF);
133
0
  emit_byte(cinfo, (int)mark);
134
0
}
135
136
137
LOCAL(void)
138
emit_2bytes(j_compress_ptr cinfo, int value)
139
/* Emit a 2-byte integer; these are always MSB first in JPEG files */
140
0
{
141
0
  emit_byte(cinfo, (value >> 8) & 0xFF);
142
0
  emit_byte(cinfo, value & 0xFF);
143
0
}
144
145
146
/*
147
 * Routines to write specific marker types.
148
 */
149
150
LOCAL(int)
151
emit_dqt(j_compress_ptr cinfo, int index)
152
/* Emit a DQT marker */
153
/* Returns the precision used (0 = 8bits, 1 = 16bits) for baseline checking */
154
0
{
155
0
  JQUANT_TBL *qtbl = cinfo->quant_tbl_ptrs[index];
156
0
  int prec;
157
0
  int i;
158
159
0
  if (qtbl == NULL)
160
0
    ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, index);
161
162
0
  prec = 0;
163
0
  for (i = 0; i < DCTSIZE2; i++) {
164
0
    if (qtbl->quantval[i] > 255)
165
0
      prec = 1;
166
0
  }
167
168
0
  if (!qtbl->sent_table) {
169
0
    emit_marker(cinfo, M_DQT);
170
171
0
    emit_2bytes(cinfo, prec ? DCTSIZE2 * 2 + 1 + 2 : DCTSIZE2 + 1 + 2);
172
173
0
    emit_byte(cinfo, index + (prec << 4));
174
175
0
    for (i = 0; i < DCTSIZE2; i++) {
176
      /* The table entries must be emitted in zigzag order. */
177
0
      unsigned int qval = qtbl->quantval[jpeg_natural_order[i]];
178
0
      if (prec)
179
0
        emit_byte(cinfo, (int)(qval >> 8));
180
0
      emit_byte(cinfo, (int)(qval & 0xFF));
181
0
    }
182
183
0
    qtbl->sent_table = TRUE;
184
0
  }
185
186
0
  return prec;
187
0
}
188
189
190
LOCAL(void)
191
emit_dht(j_compress_ptr cinfo, int index, boolean is_ac)
192
/* Emit a DHT marker */
193
0
{
194
0
  JHUFF_TBL *htbl;
195
0
  int length, i;
196
197
0
  if (is_ac) {
198
0
    htbl = cinfo->ac_huff_tbl_ptrs[index];
199
0
    index += 0x10;              /* output index has AC bit set */
200
0
  } else {
201
0
    htbl = cinfo->dc_huff_tbl_ptrs[index];
202
0
  }
203
204
0
  if (htbl == NULL)
205
0
    ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, index);
206
207
0
  if (!htbl->sent_table) {
208
0
    emit_marker(cinfo, M_DHT);
209
210
0
    length = 0;
211
0
    for (i = 1; i <= 16; i++)
212
0
      length += htbl->bits[i];
213
214
0
    emit_2bytes(cinfo, length + 2 + 1 + 16);
215
0
    emit_byte(cinfo, index);
216
217
0
    for (i = 1; i <= 16; i++)
218
0
      emit_byte(cinfo, htbl->bits[i]);
219
220
0
    for (i = 0; i < length; i++)
221
0
      emit_byte(cinfo, htbl->huffval[i]);
222
223
0
    htbl->sent_table = TRUE;
224
0
  }
225
0
}
226
227
228
LOCAL(void)
229
emit_dac(j_compress_ptr cinfo)
230
/* Emit a DAC marker */
231
/* Since the useful info is so small, we want to emit all the tables in */
232
/* one DAC marker.  Therefore this routine does its own scan of the table. */
233
0
{
234
0
#ifdef C_ARITH_CODING_SUPPORTED
235
0
  char dc_in_use[NUM_ARITH_TBLS];
236
0
  char ac_in_use[NUM_ARITH_TBLS];
237
0
  int length, i;
238
0
  jpeg_component_info *compptr;
239
240
0
  for (i = 0; i < NUM_ARITH_TBLS; i++)
241
0
    dc_in_use[i] = ac_in_use[i] = 0;
242
243
0
  for (i = 0; i < cinfo->comps_in_scan; i++) {
244
0
    compptr = cinfo->cur_comp_info[i];
245
    /* DC needs no table for refinement scan */
246
0
    if (cinfo->Ss == 0 && cinfo->Ah == 0)
247
0
      dc_in_use[compptr->dc_tbl_no] = 1;
248
    /* AC needs no table when not present */
249
0
    if (cinfo->Se)
250
0
      ac_in_use[compptr->ac_tbl_no] = 1;
251
0
  }
252
253
0
  length = 0;
254
0
  for (i = 0; i < NUM_ARITH_TBLS; i++)
255
0
    length += dc_in_use[i] + ac_in_use[i];
256
257
0
  if (length) {
258
0
    emit_marker(cinfo, M_DAC);
259
260
0
    emit_2bytes(cinfo, length * 2 + 2);
261
262
0
    for (i = 0; i < NUM_ARITH_TBLS; i++) {
263
0
      if (dc_in_use[i]) {
264
0
        emit_byte(cinfo, i);
265
0
        emit_byte(cinfo, cinfo->arith_dc_L[i] + (cinfo->arith_dc_U[i] << 4));
266
0
      }
267
0
      if (ac_in_use[i]) {
268
0
        emit_byte(cinfo, i + 0x10);
269
0
        emit_byte(cinfo, cinfo->arith_ac_K[i]);
270
0
      }
271
0
    }
272
0
  }
273
0
#endif /* C_ARITH_CODING_SUPPORTED */
274
0
}
275
276
277
LOCAL(void)
278
emit_dri(j_compress_ptr cinfo)
279
/* Emit a DRI marker */
280
0
{
281
0
  emit_marker(cinfo, M_DRI);
282
283
0
  emit_2bytes(cinfo, 4);        /* fixed length */
284
285
0
  emit_2bytes(cinfo, (int)cinfo->restart_interval);
286
0
}
287
288
289
LOCAL(void)
290
emit_sof(j_compress_ptr cinfo, JPEG_MARKER code)
291
/* Emit a SOF marker */
292
0
{
293
0
  int ci;
294
0
  jpeg_component_info *compptr;
295
296
0
  emit_marker(cinfo, code);
297
298
0
  emit_2bytes(cinfo, 3 * cinfo->num_components + 2 + 5 + 1); /* length */
299
300
  /* Make sure image isn't bigger than SOF field can handle */
301
0
  if ((long)cinfo->_jpeg_height > 65535L || (long)cinfo->_jpeg_width > 65535L)
302
0
    ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int)65535);
303
304
0
  emit_byte(cinfo, cinfo->data_precision);
305
0
  emit_2bytes(cinfo, (int)cinfo->_jpeg_height);
306
0
  emit_2bytes(cinfo, (int)cinfo->_jpeg_width);
307
308
0
  emit_byte(cinfo, cinfo->num_components);
309
310
0
  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
311
0
       ci++, compptr++) {
312
0
    emit_byte(cinfo, compptr->component_id);
313
0
    emit_byte(cinfo, (compptr->h_samp_factor << 4) + compptr->v_samp_factor);
314
0
    emit_byte(cinfo, compptr->quant_tbl_no);
315
0
  }
316
0
}
317
318
319
LOCAL(void)
320
emit_sos(j_compress_ptr cinfo)
321
/* Emit a SOS marker */
322
0
{
323
0
  int i, td, ta;
324
0
  jpeg_component_info *compptr;
325
326
0
  emit_marker(cinfo, M_SOS);
327
328
0
  emit_2bytes(cinfo, 2 * cinfo->comps_in_scan + 2 + 1 + 3); /* length */
329
330
0
  emit_byte(cinfo, cinfo->comps_in_scan);
331
332
0
  for (i = 0; i < cinfo->comps_in_scan; i++) {
333
0
    compptr = cinfo->cur_comp_info[i];
334
0
    emit_byte(cinfo, compptr->component_id);
335
336
    /* We emit 0 for unused field(s); this is recommended by the P&M text
337
     * but does not seem to be specified in the standard.
338
     */
339
340
    /* DC needs no table for refinement scan */
341
0
    td = cinfo->Ss == 0 && cinfo->Ah == 0 ? compptr->dc_tbl_no : 0;
342
    /* AC needs no table when not present */
343
0
    ta = cinfo->Se ? compptr->ac_tbl_no : 0;
344
345
0
    emit_byte(cinfo, (td << 4) + ta);
346
0
  }
347
348
0
  emit_byte(cinfo, cinfo->Ss);
349
0
  emit_byte(cinfo, cinfo->Se);
350
0
  emit_byte(cinfo, (cinfo->Ah << 4) + cinfo->Al);
351
0
}
352
353
354
LOCAL(void)
355
emit_jfif_app0(j_compress_ptr cinfo)
356
/* Emit a JFIF-compliant APP0 marker */
357
0
{
358
  /*
359
   * Length of APP0 block       (2 bytes)
360
   * Block ID                   (4 bytes - ASCII "JFIF")
361
   * Zero byte                  (1 byte to terminate the ID string)
362
   * Version Major, Minor       (2 bytes - major first)
363
   * Units                      (1 byte - 0x00 = none, 0x01 = inch, 0x02 = cm)
364
   * Xdpu                       (2 bytes - dots per unit horizontal)
365
   * Ydpu                       (2 bytes - dots per unit vertical)
366
   * Thumbnail X size           (1 byte)
367
   * Thumbnail Y size           (1 byte)
368
   */
369
370
0
  emit_marker(cinfo, M_APP0);
371
372
0
  emit_2bytes(cinfo, 2 + 4 + 1 + 2 + 1 + 2 + 2 + 1 + 1); /* length */
373
374
0
  emit_byte(cinfo, 0x4A);       /* Identifier: ASCII "JFIF" */
375
0
  emit_byte(cinfo, 0x46);
376
0
  emit_byte(cinfo, 0x49);
377
0
  emit_byte(cinfo, 0x46);
378
0
  emit_byte(cinfo, 0);
379
0
  emit_byte(cinfo, cinfo->JFIF_major_version); /* Version fields */
380
0
  emit_byte(cinfo, cinfo->JFIF_minor_version);
381
0
  emit_byte(cinfo, cinfo->density_unit); /* Pixel size information */
382
0
  emit_2bytes(cinfo, (int)cinfo->X_density);
383
0
  emit_2bytes(cinfo, (int)cinfo->Y_density);
384
0
  emit_byte(cinfo, 0);          /* No thumbnail image */
385
0
  emit_byte(cinfo, 0);
386
0
}
387
388
389
LOCAL(void)
390
emit_adobe_app14(j_compress_ptr cinfo)
391
/* Emit an Adobe APP14 marker */
392
0
{
393
  /*
394
   * Length of APP14 block      (2 bytes)
395
   * Block ID                   (5 bytes - ASCII "Adobe")
396
   * Version Number             (2 bytes - currently 100)
397
   * Flags0                     (2 bytes - currently 0)
398
   * Flags1                     (2 bytes - currently 0)
399
   * Color transform            (1 byte)
400
   *
401
   * Although Adobe TN 5116 mentions Version = 101, all the Adobe files
402
   * now in circulation seem to use Version = 100, so that's what we write.
403
   *
404
   * We write the color transform byte as 1 if the JPEG color space is
405
   * YCbCr, 2 if it's YCCK, 0 otherwise.  Adobe's definition has to do with
406
   * whether the encoder performed a transformation, which is pretty useless.
407
   */
408
409
0
  emit_marker(cinfo, M_APP14);
410
411
0
  emit_2bytes(cinfo, 2 + 5 + 2 + 2 + 2 + 1); /* length */
412
413
0
  emit_byte(cinfo, 0x41);       /* Identifier: ASCII "Adobe" */
414
0
  emit_byte(cinfo, 0x64);
415
0
  emit_byte(cinfo, 0x6F);
416
0
  emit_byte(cinfo, 0x62);
417
0
  emit_byte(cinfo, 0x65);
418
0
  emit_2bytes(cinfo, 100);      /* Version */
419
0
  emit_2bytes(cinfo, 0);        /* Flags0 */
420
0
  emit_2bytes(cinfo, 0);        /* Flags1 */
421
0
  switch (cinfo->jpeg_color_space) {
422
0
  case JCS_YCbCr:
423
0
    emit_byte(cinfo, 1);        /* Color transform = 1 */
424
0
    break;
425
0
  case JCS_YCCK:
426
0
    emit_byte(cinfo, 2);        /* Color transform = 2 */
427
0
    break;
428
0
  default:
429
0
    emit_byte(cinfo, 0);        /* Color transform = 0 */
430
0
    break;
431
0
  }
432
0
}
433
434
435
/*
436
 * These routines allow writing an arbitrary marker with parameters.
437
 * The only intended use is to emit COM or APPn markers after calling
438
 * write_file_header and before calling write_frame_header.
439
 * Other uses are not guaranteed to produce desirable results.
440
 * Counting the parameter bytes properly is the caller's responsibility.
441
 */
442
443
METHODDEF(void)
444
write_marker_header(j_compress_ptr cinfo, int marker, unsigned int datalen)
445
/* Emit an arbitrary marker header */
446
0
{
447
0
  if (datalen > (unsigned int)65533)            /* safety check */
448
0
    ERREXIT(cinfo, JERR_BAD_LENGTH);
449
450
0
  emit_marker(cinfo, (JPEG_MARKER)marker);
451
452
0
  emit_2bytes(cinfo, (int)(datalen + 2));       /* total length */
453
0
}
454
455
METHODDEF(void)
456
write_marker_byte(j_compress_ptr cinfo, int val)
457
/* Emit one byte of marker parameters following write_marker_header */
458
0
{
459
0
  emit_byte(cinfo, val);
460
0
}
461
462
463
/*
464
 * Write datastream header.
465
 * This consists of an SOI and optional APPn markers.
466
 * We recommend use of the JFIF marker, but not the Adobe marker,
467
 * when using YCbCr or grayscale data.  The JFIF marker should NOT
468
 * be used for any other JPEG colorspace.  The Adobe marker is helpful
469
 * to distinguish RGB, CMYK, and YCCK colorspaces.
470
 * Note that an application can write additional header markers after
471
 * jpeg_start_compress returns.
472
 */
473
474
METHODDEF(void)
475
write_file_header(j_compress_ptr cinfo)
476
0
{
477
0
  my_marker_ptr marker = (my_marker_ptr)cinfo->marker;
478
479
0
  emit_marker(cinfo, M_SOI);    /* first the SOI */
480
481
  /* SOI is defined to reset restart interval to 0 */
482
0
  marker->last_restart_interval = 0;
483
484
0
  if (cinfo->write_JFIF_header) /* next an optional JFIF APP0 */
485
0
    emit_jfif_app0(cinfo);
486
0
  if (cinfo->write_Adobe_marker) /* next an optional Adobe APP14 */
487
0
    emit_adobe_app14(cinfo);
488
0
}
489
490
491
/*
492
 * Write frame header.
493
 * This consists of DQT and SOFn markers.
494
 * Note that we do not emit the SOF until we have emitted the DQT(s).
495
 * This avoids compatibility problems with incorrect implementations that
496
 * try to error-check the quant table numbers as soon as they see the SOF.
497
 */
498
499
METHODDEF(void)
500
write_frame_header(j_compress_ptr cinfo)
501
0
{
502
0
  int ci, prec = 0;
503
0
  boolean is_baseline;
504
0
  jpeg_component_info *compptr;
505
506
0
  if (!cinfo->master->lossless) {
507
    /* Emit DQT for each quantization table.
508
     * Note that emit_dqt() suppresses any duplicate tables.
509
     */
510
0
    for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
511
0
         ci++, compptr++) {
512
0
      prec += emit_dqt(cinfo, compptr->quant_tbl_no);
513
0
    }
514
    /* now prec is nonzero iff there are any 16-bit quant tables. */
515
0
  }
516
517
  /* Check for a non-baseline specification.
518
   * Note we assume that Huffman table numbers won't be changed later.
519
   */
520
0
  if (cinfo->arith_code || cinfo->progressive_mode ||
521
0
      cinfo->master->lossless || cinfo->data_precision != 8) {
522
0
    is_baseline = FALSE;
523
0
  } else {
524
0
    is_baseline = TRUE;
525
0
    for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
526
0
         ci++, compptr++) {
527
0
      if (compptr->dc_tbl_no > 1 || compptr->ac_tbl_no > 1)
528
0
        is_baseline = FALSE;
529
0
    }
530
0
    if (prec && is_baseline) {
531
0
      is_baseline = FALSE;
532
      /* If it's baseline except for quantizer size, warn the user */
533
0
      TRACEMS(cinfo, 0, JTRC_16BIT_TABLES);
534
0
    }
535
0
  }
536
537
  /* Emit the proper SOF marker */
538
0
  if (cinfo->arith_code) {
539
0
    if (cinfo->progressive_mode)
540
0
      emit_sof(cinfo, M_SOF10); /* SOF code for progressive arithmetic */
541
0
    else
542
0
      emit_sof(cinfo, M_SOF9);  /* SOF code for sequential arithmetic */
543
0
  } else {
544
0
    if (cinfo->progressive_mode)
545
0
      emit_sof(cinfo, M_SOF2);  /* SOF code for progressive Huffman */
546
0
    else if (cinfo->master->lossless)
547
0
      emit_sof(cinfo, M_SOF3);  /* SOF code for lossless Huffman */
548
0
    else if (is_baseline)
549
0
      emit_sof(cinfo, M_SOF0);  /* SOF code for baseline implementation */
550
0
    else
551
0
      emit_sof(cinfo, M_SOF1);  /* SOF code for non-baseline Huffman file */
552
0
  }
553
0
}
554
555
556
/*
557
 * Write scan header.
558
 * This consists of DHT or DAC markers, optional DRI, and SOS.
559
 * Compressed data will be written following the SOS.
560
 */
561
562
METHODDEF(void)
563
write_scan_header(j_compress_ptr cinfo)
564
0
{
565
0
  my_marker_ptr marker = (my_marker_ptr)cinfo->marker;
566
0
  int i;
567
0
  jpeg_component_info *compptr;
568
569
0
  if (cinfo->arith_code) {
570
    /* Emit arith conditioning info.  We may have some duplication
571
     * if the file has multiple scans, but it's so small it's hardly
572
     * worth worrying about.
573
     */
574
0
    emit_dac(cinfo);
575
0
  } else {
576
    /* Emit Huffman tables.
577
     * Note that emit_dht() suppresses any duplicate tables.
578
     */
579
0
    for (i = 0; i < cinfo->comps_in_scan; i++) {
580
0
      compptr = cinfo->cur_comp_info[i];
581
      /* DC needs no table for refinement scan */
582
0
      if ((cinfo->Ss == 0 && cinfo->Ah == 0) || cinfo->master->lossless)
583
0
        emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
584
      /* AC needs no table when not present, and lossless mode uses only DC
585
         tables. */
586
0
      if (cinfo->Se && !cinfo->master->lossless)
587
0
        emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
588
0
    }
589
0
  }
590
591
  /* Emit DRI if required --- note that DRI value could change for each scan.
592
   * We avoid wasting space with unnecessary DRIs, however.
593
   */
594
0
  if (cinfo->restart_interval != marker->last_restart_interval) {
595
0
    emit_dri(cinfo);
596
0
    marker->last_restart_interval = cinfo->restart_interval;
597
0
  }
598
599
0
  emit_sos(cinfo);
600
0
}
601
602
603
/*
604
 * Write datastream trailer.
605
 */
606
607
METHODDEF(void)
608
write_file_trailer(j_compress_ptr cinfo)
609
0
{
610
0
  emit_marker(cinfo, M_EOI);
611
0
}
612
613
614
/*
615
 * Write an abbreviated table-specification datastream.
616
 * This consists of SOI, DQT and DHT tables, and EOI.
617
 * Any table that is defined and not marked sent_table = TRUE will be
618
 * emitted.  Note that all tables will be marked sent_table = TRUE at exit.
619
 */
620
621
METHODDEF(void)
622
write_tables_only(j_compress_ptr cinfo)
623
0
{
624
0
  int i;
625
626
0
  emit_marker(cinfo, M_SOI);
627
628
0
  for (i = 0; i < NUM_QUANT_TBLS; i++) {
629
0
    if (cinfo->quant_tbl_ptrs[i] != NULL)
630
0
      (void)emit_dqt(cinfo, i);
631
0
  }
632
633
0
  if (!cinfo->arith_code) {
634
0
    for (i = 0; i < NUM_HUFF_TBLS; i++) {
635
0
      if (cinfo->dc_huff_tbl_ptrs[i] != NULL)
636
0
        emit_dht(cinfo, i, FALSE);
637
0
      if (cinfo->ac_huff_tbl_ptrs[i] != NULL)
638
0
        emit_dht(cinfo, i, TRUE);
639
0
    }
640
0
  }
641
642
0
  emit_marker(cinfo, M_EOI);
643
0
}
644
645
646
/*
647
 * Initialize the marker writer module.
648
 */
649
650
GLOBAL(void)
651
jinit_marker_writer(j_compress_ptr cinfo)
652
0
{
653
0
  my_marker_ptr marker;
654
655
  /* Create the subobject */
656
0
  marker = (my_marker_ptr)
657
0
    (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
658
0
                                sizeof(my_marker_writer));
659
0
  cinfo->marker = (struct jpeg_marker_writer *)marker;
660
  /* Initialize method pointers */
661
0
  marker->pub.write_file_header = write_file_header;
662
0
  marker->pub.write_frame_header = write_frame_header;
663
0
  marker->pub.write_scan_header = write_scan_header;
664
0
  marker->pub.write_file_trailer = write_file_trailer;
665
0
  marker->pub.write_tables_only = write_tables_only;
666
0
  marker->pub.write_marker_header = write_marker_header;
667
0
  marker->pub.write_marker_byte = write_marker_byte;
668
  /* Initialize private state */
669
0
  marker->last_restart_interval = 0;
670
0
}