1 : /*
2 : * jcmarker.c
3 : *
4 : * Copyright (C) 1991-1998, Thomas G. Lane.
5 : * Copyright (C) 2010, D. R. Commander.
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 : #include "jpegcomp.h"
16 :
17 :
18 : typedef enum { /* JPEG marker codes */
19 : M_SOF0 = 0xc0,
20 : M_SOF1 = 0xc1,
21 : M_SOF2 = 0xc2,
22 : M_SOF3 = 0xc3,
23 :
24 : M_SOF5 = 0xc5,
25 : M_SOF6 = 0xc6,
26 : M_SOF7 = 0xc7,
27 :
28 : M_JPG = 0xc8,
29 : M_SOF9 = 0xc9,
30 : M_SOF10 = 0xca,
31 : M_SOF11 = 0xcb,
32 :
33 : M_SOF13 = 0xcd,
34 : M_SOF14 = 0xce,
35 : M_SOF15 = 0xcf,
36 :
37 : M_DHT = 0xc4,
38 :
39 : M_DAC = 0xcc,
40 :
41 : M_RST0 = 0xd0,
42 : M_RST1 = 0xd1,
43 : M_RST2 = 0xd2,
44 : M_RST3 = 0xd3,
45 : M_RST4 = 0xd4,
46 : M_RST5 = 0xd5,
47 : M_RST6 = 0xd6,
48 : M_RST7 = 0xd7,
49 :
50 : M_SOI = 0xd8,
51 : M_EOI = 0xd9,
52 : M_SOS = 0xda,
53 : M_DQT = 0xdb,
54 : M_DNL = 0xdc,
55 : M_DRI = 0xdd,
56 : M_DHP = 0xde,
57 : M_EXP = 0xdf,
58 :
59 : M_APP0 = 0xe0,
60 : M_APP1 = 0xe1,
61 : M_APP2 = 0xe2,
62 : M_APP3 = 0xe3,
63 : M_APP4 = 0xe4,
64 : M_APP5 = 0xe5,
65 : M_APP6 = 0xe6,
66 : M_APP7 = 0xe7,
67 : M_APP8 = 0xe8,
68 : M_APP9 = 0xe9,
69 : M_APP10 = 0xea,
70 : M_APP11 = 0xeb,
71 : M_APP12 = 0xec,
72 : M_APP13 = 0xed,
73 : M_APP14 = 0xee,
74 : M_APP15 = 0xef,
75 :
76 : M_JPG0 = 0xf0,
77 : M_JPG13 = 0xfd,
78 : M_COM = 0xfe,
79 :
80 : M_TEM = 0x01,
81 :
82 : M_ERROR = 0x100
83 : } JPEG_MARKER;
84 :
85 :
86 : /* Private state */
87 :
88 : typedef struct {
89 : struct jpeg_marker_writer pub; /* public fields */
90 :
91 : unsigned int last_restart_interval; /* last DRI value emitted; 0 after SOI */
92 : } my_marker_writer;
93 :
94 : typedef my_marker_writer * my_marker_ptr;
95 :
96 :
97 : /*
98 : * Basic output routines.
99 : *
100 : * Note that we do not support suspension while writing a marker.
101 : * Therefore, an application using suspension must ensure that there is
102 : * enough buffer space for the initial markers (typ. 600-700 bytes) before
103 : * calling jpeg_start_compress, and enough space to write the trailing EOI
104 : * (a few bytes) before calling jpeg_finish_compress. Multipass compression
105 : * modes are not supported at all with suspension, so those two are the only
106 : * points where markers will be written.
107 : */
108 :
109 : LOCAL(void)
110 1875 : emit_byte (j_compress_ptr cinfo, int val)
111 : /* Emit a byte */
112 : {
113 1875 : struct jpeg_destination_mgr * dest = cinfo->dest;
114 :
115 1875 : *(dest->next_output_byte)++ = (JOCTET) val;
116 1875 : if (--dest->free_in_buffer == 0) {
117 0 : if (! (*dest->empty_output_buffer) (cinfo))
118 0 : ERREXIT(cinfo, JERR_CANT_SUSPEND);
119 : }
120 1875 : }
121 :
122 :
123 : LOCAL(void)
124 33 : emit_marker (j_compress_ptr cinfo, JPEG_MARKER mark)
125 : /* Emit a marker code */
126 : {
127 33 : emit_byte(cinfo, 0xFF);
128 33 : emit_byte(cinfo, (int) mark);
129 33 : }
130 :
131 :
132 : LOCAL(void)
133 39 : emit_2bytes (j_compress_ptr cinfo, int value)
134 : /* Emit a 2-byte integer; these are always MSB first in JPEG files */
135 : {
136 39 : emit_byte(cinfo, (value >> 8) & 0xFF);
137 39 : emit_byte(cinfo, value & 0xFF);
138 39 : }
139 :
140 :
141 : /*
142 : * Routines to write specific marker types.
143 : */
144 :
145 : LOCAL(int)
146 9 : emit_dqt (j_compress_ptr cinfo, int index)
147 : /* Emit a DQT marker */
148 : /* Returns the precision used (0 = 8bits, 1 = 16bits) for baseline checking */
149 : {
150 9 : JQUANT_TBL * qtbl = cinfo->quant_tbl_ptrs[index];
151 : int prec;
152 : int i;
153 :
154 9 : if (qtbl == NULL)
155 0 : ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, index);
156 :
157 9 : prec = 0;
158 585 : for (i = 0; i < DCTSIZE2; i++) {
159 576 : if (qtbl->quantval[i] > 255)
160 0 : prec = 1;
161 : }
162 :
163 9 : if (! qtbl->sent_table) {
164 6 : emit_marker(cinfo, M_DQT);
165 :
166 6 : emit_2bytes(cinfo, prec ? DCTSIZE2*2 + 1 + 2 : DCTSIZE2 + 1 + 2);
167 :
168 6 : emit_byte(cinfo, index + (prec<<4));
169 :
170 390 : for (i = 0; i < DCTSIZE2; i++) {
171 : /* The table entries must be emitted in zigzag order. */
172 384 : unsigned int qval = qtbl->quantval[jpeg_natural_order[i]];
173 384 : if (prec)
174 0 : emit_byte(cinfo, (int) (qval >> 8));
175 384 : emit_byte(cinfo, (int) (qval & 0xFF));
176 : }
177 :
178 6 : qtbl->sent_table = TRUE;
179 : }
180 :
181 9 : return prec;
182 : }
183 :
184 :
185 : LOCAL(void)
186 18 : emit_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 18 : if (is_ac) {
193 9 : htbl = cinfo->ac_huff_tbl_ptrs[index];
194 9 : index += 0x10; /* output index has AC bit set */
195 : } else {
196 9 : htbl = cinfo->dc_huff_tbl_ptrs[index];
197 : }
198 :
199 18 : if (htbl == NULL)
200 0 : ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, index);
201 :
202 18 : if (! htbl->sent_table) {
203 12 : emit_marker(cinfo, M_DHT);
204 :
205 12 : length = 0;
206 204 : for (i = 1; i <= 16; i++)
207 192 : length += htbl->bits[i];
208 :
209 12 : emit_2bytes(cinfo, length + 2 + 1 + 16);
210 12 : emit_byte(cinfo, index);
211 :
212 204 : for (i = 1; i <= 16; i++)
213 192 : emit_byte(cinfo, htbl->bits[i]);
214 :
215 1056 : for (i = 0; i < length; i++)
216 1044 : emit_byte(cinfo, htbl->huffval[i]);
217 :
218 12 : htbl->sent_table = TRUE;
219 : }
220 18 : }
221 :
222 :
223 : LOCAL(void)
224 0 : emit_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_in_use[compptr->dc_tbl_no] = 1;
241 : ac_in_use[compptr->ac_tbl_no] = 1;
242 : }
243 :
244 : length = 0;
245 : for (i = 0; i < NUM_ARITH_TBLS; i++)
246 : length += dc_in_use[i] + ac_in_use[i];
247 :
248 : emit_marker(cinfo, M_DAC);
249 :
250 : emit_2bytes(cinfo, length*2 + 2);
251 :
252 : for (i = 0; i < NUM_ARITH_TBLS; i++) {
253 : if (dc_in_use[i]) {
254 : emit_byte(cinfo, i);
255 : emit_byte(cinfo, cinfo->arith_dc_L[i] + (cinfo->arith_dc_U[i]<<4));
256 : }
257 : if (ac_in_use[i]) {
258 : emit_byte(cinfo, i + 0x10);
259 : emit_byte(cinfo, cinfo->arith_ac_K[i]);
260 : }
261 : }
262 : #endif /* C_ARITH_CODING_SUPPORTED */
263 0 : }
264 :
265 :
266 : LOCAL(void)
267 0 : emit_dri (j_compress_ptr cinfo)
268 : /* Emit a DRI marker */
269 : {
270 0 : emit_marker(cinfo, M_DRI);
271 :
272 0 : emit_2bytes(cinfo, 4); /* fixed length */
273 :
274 0 : emit_2bytes(cinfo, (int) cinfo->restart_interval);
275 0 : }
276 :
277 :
278 : LOCAL(void)
279 3 : emit_sof (j_compress_ptr cinfo, JPEG_MARKER code)
280 : /* Emit a SOF marker */
281 : {
282 : int ci;
283 : jpeg_component_info *compptr;
284 :
285 3 : emit_marker(cinfo, code);
286 :
287 3 : emit_2bytes(cinfo, 3 * cinfo->num_components + 2 + 5 + 1); /* length */
288 :
289 : /* Make sure image isn't bigger than SOF field can handle */
290 6 : if ((long) cinfo->_jpeg_height > 65535L ||
291 3 : (long) cinfo->_jpeg_width > 65535L)
292 0 : ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) 65535);
293 :
294 3 : emit_byte(cinfo, cinfo->data_precision);
295 3 : emit_2bytes(cinfo, (int) cinfo->_jpeg_height);
296 3 : emit_2bytes(cinfo, (int) cinfo->_jpeg_width);
297 :
298 3 : emit_byte(cinfo, cinfo->num_components);
299 :
300 15 : for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
301 9 : ci++, compptr++) {
302 9 : emit_byte(cinfo, compptr->component_id);
303 9 : emit_byte(cinfo, (compptr->h_samp_factor << 4) + compptr->v_samp_factor);
304 9 : emit_byte(cinfo, compptr->quant_tbl_no);
305 : }
306 3 : }
307 :
308 :
309 : LOCAL(void)
310 3 : emit_sos (j_compress_ptr cinfo)
311 : /* Emit a SOS marker */
312 : {
313 : int i, td, ta;
314 : jpeg_component_info *compptr;
315 :
316 3 : emit_marker(cinfo, M_SOS);
317 :
318 3 : emit_2bytes(cinfo, 2 * cinfo->comps_in_scan + 2 + 1 + 3); /* length */
319 :
320 3 : emit_byte(cinfo, cinfo->comps_in_scan);
321 :
322 12 : for (i = 0; i < cinfo->comps_in_scan; i++) {
323 9 : compptr = cinfo->cur_comp_info[i];
324 9 : emit_byte(cinfo, compptr->component_id);
325 9 : td = compptr->dc_tbl_no;
326 9 : ta = compptr->ac_tbl_no;
327 9 : if (cinfo->progressive_mode) {
328 : /* Progressive mode: only DC or only AC tables are used in one scan;
329 : * furthermore, Huffman coding of DC refinement uses no table at all.
330 : * We emit 0 for unused field(s); this is recommended by the P&M text
331 : * but does not seem to be specified in the standard.
332 : */
333 0 : if (cinfo->Ss == 0) {
334 0 : ta = 0; /* DC scan */
335 0 : if (cinfo->Ah != 0 && !cinfo->arith_code)
336 0 : td = 0; /* no DC table either */
337 : } else {
338 0 : td = 0; /* AC scan */
339 : }
340 : }
341 9 : emit_byte(cinfo, (td << 4) + ta);
342 : }
343 :
344 3 : emit_byte(cinfo, cinfo->Ss);
345 3 : emit_byte(cinfo, cinfo->Se);
346 3 : emit_byte(cinfo, (cinfo->Ah << 4) + cinfo->Al);
347 3 : }
348 :
349 :
350 : LOCAL(void)
351 3 : emit_jfif_app0 (j_compress_ptr cinfo)
352 : /* Emit a JFIF-compliant APP0 marker */
353 : {
354 : /*
355 : * Length of APP0 block (2 bytes)
356 : * Block ID (4 bytes - ASCII "JFIF")
357 : * Zero byte (1 byte to terminate the ID string)
358 : * Version Major, Minor (2 bytes - major first)
359 : * Units (1 byte - 0x00 = none, 0x01 = inch, 0x02 = cm)
360 : * Xdpu (2 bytes - dots per unit horizontal)
361 : * Ydpu (2 bytes - dots per unit vertical)
362 : * Thumbnail X size (1 byte)
363 : * Thumbnail Y size (1 byte)
364 : */
365 :
366 3 : emit_marker(cinfo, M_APP0);
367 :
368 3 : emit_2bytes(cinfo, 2 + 4 + 1 + 2 + 1 + 2 + 2 + 1 + 1); /* length */
369 :
370 3 : emit_byte(cinfo, 0x4A); /* Identifier: ASCII "JFIF" */
371 3 : emit_byte(cinfo, 0x46);
372 3 : emit_byte(cinfo, 0x49);
373 3 : emit_byte(cinfo, 0x46);
374 3 : emit_byte(cinfo, 0);
375 3 : emit_byte(cinfo, cinfo->JFIF_major_version); /* Version fields */
376 3 : emit_byte(cinfo, cinfo->JFIF_minor_version);
377 3 : emit_byte(cinfo, cinfo->density_unit); /* Pixel size information */
378 3 : emit_2bytes(cinfo, (int) cinfo->X_density);
379 3 : emit_2bytes(cinfo, (int) cinfo->Y_density);
380 3 : emit_byte(cinfo, 0); /* No thumbnail image */
381 3 : emit_byte(cinfo, 0);
382 3 : }
383 :
384 :
385 : LOCAL(void)
386 0 : emit_adobe_app14 (j_compress_ptr cinfo)
387 : /* Emit an Adobe APP14 marker */
388 : {
389 : /*
390 : * Length of APP14 block (2 bytes)
391 : * Block ID (5 bytes - ASCII "Adobe")
392 : * Version Number (2 bytes - currently 100)
393 : * Flags0 (2 bytes - currently 0)
394 : * Flags1 (2 bytes - currently 0)
395 : * Color transform (1 byte)
396 : *
397 : * Although Adobe TN 5116 mentions Version = 101, all the Adobe files
398 : * now in circulation seem to use Version = 100, so that's what we write.
399 : *
400 : * We write the color transform byte as 1 if the JPEG color space is
401 : * YCbCr, 2 if it's YCCK, 0 otherwise. Adobe's definition has to do with
402 : * whether the encoder performed a transformation, which is pretty useless.
403 : */
404 :
405 0 : emit_marker(cinfo, M_APP14);
406 :
407 0 : emit_2bytes(cinfo, 2 + 5 + 2 + 2 + 2 + 1); /* length */
408 :
409 0 : emit_byte(cinfo, 0x41); /* Identifier: ASCII "Adobe" */
410 0 : emit_byte(cinfo, 0x64);
411 0 : emit_byte(cinfo, 0x6F);
412 0 : emit_byte(cinfo, 0x62);
413 0 : emit_byte(cinfo, 0x65);
414 0 : emit_2bytes(cinfo, 100); /* Version */
415 0 : emit_2bytes(cinfo, 0); /* Flags0 */
416 0 : emit_2bytes(cinfo, 0); /* Flags1 */
417 0 : switch (cinfo->jpeg_color_space) {
418 : case JCS_YCbCr:
419 0 : emit_byte(cinfo, 1); /* Color transform = 1 */
420 0 : break;
421 : case JCS_YCCK:
422 0 : emit_byte(cinfo, 2); /* Color transform = 2 */
423 0 : break;
424 : default:
425 0 : emit_byte(cinfo, 0); /* Color transform = 0 */
426 0 : break;
427 : }
428 0 : }
429 :
430 :
431 : /*
432 : * These routines allow writing an arbitrary marker with parameters.
433 : * The only intended use is to emit COM or APPn markers after calling
434 : * write_file_header and before calling write_frame_header.
435 : * Other uses are not guaranteed to produce desirable results.
436 : * Counting the parameter bytes properly is the caller's responsibility.
437 : */
438 :
439 : METHODDEF(void)
440 0 : write_marker_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
441 : /* Emit an arbitrary marker header */
442 : {
443 0 : if (datalen > (unsigned int) 65533) /* safety check */
444 0 : ERREXIT(cinfo, JERR_BAD_LENGTH);
445 :
446 0 : emit_marker(cinfo, (JPEG_MARKER) marker);
447 :
448 0 : emit_2bytes(cinfo, (int) (datalen + 2)); /* total length */
449 0 : }
450 :
451 : METHODDEF(void)
452 0 : write_marker_byte (j_compress_ptr cinfo, int val)
453 : /* Emit one byte of marker parameters following write_marker_header */
454 : {
455 0 : emit_byte(cinfo, val);
456 0 : }
457 :
458 :
459 : /*
460 : * Write datastream header.
461 : * This consists of an SOI and optional APPn markers.
462 : * We recommend use of the JFIF marker, but not the Adobe marker,
463 : * when using YCbCr or grayscale data. The JFIF marker should NOT
464 : * be used for any other JPEG colorspace. The Adobe marker is helpful
465 : * to distinguish RGB, CMYK, and YCCK colorspaces.
466 : * Note that an application can write additional header markers after
467 : * jpeg_start_compress returns.
468 : */
469 :
470 : METHODDEF(void)
471 3 : write_file_header (j_compress_ptr cinfo)
472 : {
473 3 : my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
474 :
475 3 : emit_marker(cinfo, M_SOI); /* first the SOI */
476 :
477 : /* SOI is defined to reset restart interval to 0 */
478 3 : marker->last_restart_interval = 0;
479 :
480 3 : if (cinfo->write_JFIF_header) /* next an optional JFIF APP0 */
481 3 : emit_jfif_app0(cinfo);
482 3 : if (cinfo->write_Adobe_marker) /* next an optional Adobe APP14 */
483 0 : emit_adobe_app14(cinfo);
484 3 : }
485 :
486 :
487 : /*
488 : * Write frame header.
489 : * This consists of DQT and SOFn markers.
490 : * Note that we do not emit the SOF until we have emitted the DQT(s).
491 : * This avoids compatibility problems with incorrect implementations that
492 : * try to error-check the quant table numbers as soon as they see the SOF.
493 : */
494 :
495 : METHODDEF(void)
496 3 : write_frame_header (j_compress_ptr cinfo)
497 : {
498 : int ci, prec;
499 : boolean is_baseline;
500 : jpeg_component_info *compptr;
501 :
502 : /* Emit DQT for each quantization table.
503 : * Note that emit_dqt() suppresses any duplicate tables.
504 : */
505 3 : prec = 0;
506 15 : for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
507 9 : ci++, compptr++) {
508 9 : prec += emit_dqt(cinfo, compptr->quant_tbl_no);
509 : }
510 : /* now prec is nonzero iff there are any 16-bit quant tables. */
511 :
512 : /* Check for a non-baseline specification.
513 : * Note we assume that Huffman table numbers won't be changed later.
514 : */
515 6 : if (cinfo->arith_code || cinfo->progressive_mode ||
516 3 : cinfo->data_precision != 8) {
517 0 : is_baseline = FALSE;
518 : } else {
519 3 : is_baseline = TRUE;
520 15 : for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
521 9 : ci++, compptr++) {
522 9 : if (compptr->dc_tbl_no > 1 || compptr->ac_tbl_no > 1)
523 0 : is_baseline = FALSE;
524 : }
525 3 : if (prec && is_baseline) {
526 0 : is_baseline = FALSE;
527 : /* If it's baseline except for quantizer size, warn the user */
528 0 : TRACEMS(cinfo, 0, JTRC_16BIT_TABLES);
529 : }
530 : }
531 :
532 : /* Emit the proper SOF marker */
533 3 : if (cinfo->arith_code) {
534 0 : emit_sof(cinfo, M_SOF9); /* SOF code for arithmetic coding */
535 : } else {
536 3 : if (cinfo->progressive_mode)
537 0 : emit_sof(cinfo, M_SOF2); /* SOF code for progressive Huffman */
538 3 : else if (is_baseline)
539 3 : emit_sof(cinfo, M_SOF0); /* SOF code for baseline implementation */
540 : else
541 0 : emit_sof(cinfo, M_SOF1); /* SOF code for non-baseline Huffman file */
542 : }
543 3 : }
544 :
545 :
546 : /*
547 : * Write scan header.
548 : * This consists of DHT or DAC markers, optional DRI, and SOS.
549 : * Compressed data will be written following the SOS.
550 : */
551 :
552 : METHODDEF(void)
553 3 : write_scan_header (j_compress_ptr cinfo)
554 : {
555 3 : my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
556 : int i;
557 : jpeg_component_info *compptr;
558 :
559 3 : if (cinfo->arith_code) {
560 : /* Emit arith conditioning info. We may have some duplication
561 : * if the file has multiple scans, but it's so small it's hardly
562 : * worth worrying about.
563 : */
564 0 : emit_dac(cinfo);
565 : } else {
566 : /* Emit Huffman tables.
567 : * Note that emit_dht() suppresses any duplicate tables.
568 : */
569 12 : for (i = 0; i < cinfo->comps_in_scan; i++) {
570 9 : compptr = cinfo->cur_comp_info[i];
571 9 : if (cinfo->progressive_mode) {
572 : /* Progressive mode: only DC or only AC tables are used in one scan */
573 0 : if (cinfo->Ss == 0) {
574 0 : if (cinfo->Ah == 0) /* DC needs no table for refinement scan */
575 0 : emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
576 : } else {
577 0 : emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
578 : }
579 : } else {
580 : /* Sequential mode: need both DC and AC tables */
581 9 : emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
582 9 : emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
583 : }
584 : }
585 : }
586 :
587 : /* Emit DRI if required --- note that DRI value could change for each scan.
588 : * We avoid wasting space with unnecessary DRIs, however.
589 : */
590 3 : if (cinfo->restart_interval != marker->last_restart_interval) {
591 0 : emit_dri(cinfo);
592 0 : marker->last_restart_interval = cinfo->restart_interval;
593 : }
594 :
595 3 : emit_sos(cinfo);
596 3 : }
597 :
598 :
599 : /*
600 : * Write datastream trailer.
601 : */
602 :
603 : METHODDEF(void)
604 3 : write_file_trailer (j_compress_ptr cinfo)
605 : {
606 3 : emit_marker(cinfo, M_EOI);
607 3 : }
608 :
609 :
610 : /*
611 : * Write an abbreviated table-specification datastream.
612 : * This consists of SOI, DQT and DHT tables, and EOI.
613 : * Any table that is defined and not marked sent_table = TRUE will be
614 : * emitted. Note that all tables will be marked sent_table = TRUE at exit.
615 : */
616 :
617 : METHODDEF(void)
618 0 : write_tables_only (j_compress_ptr cinfo)
619 : {
620 : int i;
621 :
622 0 : emit_marker(cinfo, M_SOI);
623 :
624 0 : for (i = 0; i < NUM_QUANT_TBLS; i++) {
625 0 : if (cinfo->quant_tbl_ptrs[i] != NULL)
626 0 : (void) emit_dqt(cinfo, i);
627 : }
628 :
629 0 : if (! cinfo->arith_code) {
630 0 : for (i = 0; i < NUM_HUFF_TBLS; i++) {
631 0 : if (cinfo->dc_huff_tbl_ptrs[i] != NULL)
632 0 : emit_dht(cinfo, i, FALSE);
633 0 : if (cinfo->ac_huff_tbl_ptrs[i] != NULL)
634 0 : emit_dht(cinfo, i, TRUE);
635 : }
636 : }
637 :
638 0 : emit_marker(cinfo, M_EOI);
639 0 : }
640 :
641 :
642 : /*
643 : * Initialize the marker writer module.
644 : */
645 :
646 : GLOBAL(void)
647 3 : jinit_marker_writer (j_compress_ptr cinfo)
648 : {
649 : my_marker_ptr marker;
650 :
651 : /* Create the subobject */
652 3 : marker = (my_marker_ptr)
653 3 : (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
654 : SIZEOF(my_marker_writer));
655 3 : cinfo->marker = (struct jpeg_marker_writer *) marker;
656 : /* Initialize method pointers */
657 3 : marker->pub.write_file_header = write_file_header;
658 3 : marker->pub.write_frame_header = write_frame_header;
659 3 : marker->pub.write_scan_header = write_scan_header;
660 3 : marker->pub.write_file_trailer = write_file_trailer;
661 3 : marker->pub.write_tables_only = write_tables_only;
662 3 : marker->pub.write_marker_header = write_marker_header;
663 3 : marker->pub.write_marker_byte = write_marker_byte;
664 : /* Initialize private state */
665 3 : marker->last_restart_interval = 0;
666 3 : }
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