Details | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
6417 | ashmew2 | 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. */ |
||
105 | } my_marker_reader; |
||
106 | |||
107 | typedef my_marker_reader * my_marker_ptr; |
||
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) |
||
197 | get_soi (j_decompress_ptr cinfo) |
||
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; |
||
242 | jpeg_component_info * compptr; |
||
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) |
||
301 | get_sos (j_decompress_ptr cinfo) |
||
302 | /* Process a SOS marker */ |
||
303 | { |
||
304 | INT32 length; |
||
305 | int i, ci, n, c, cc; |
||
306 | jpeg_component_info * compptr; |
||
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) |
||
373 | get_dac (j_decompress_ptr cinfo) |
||
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) |
||
419 | get_dht (j_decompress_ptr cinfo) |
||
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) |
||
490 | get_dqt (j_decompress_ptr cinfo) |
||
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) |
||
513 | cinfo->quant_tbl_ptrs[n] = jpeg_alloc_quant_table((j_common_ptr) cinfo); |
||
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) |
||
548 | get_dri (j_decompress_ptr cinfo) |
||
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) |
||
584 | examine_app0 (j_decompress_ptr cinfo, JOCTET FAR * data, |
||
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) |
||
660 | examine_app14 (j_decompress_ptr cinfo, JOCTET FAR * data, |
||
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) |
||
691 | get_interesting_appn (j_decompress_ptr cinfo) |
||
692 | /* Process an APP0 or APP14 marker without saving it */ |
||
693 | { |
||
694 | INT32 length; |
||
695 | JOCTET b[APPN_DATA_LEN]; |
||
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) |
||
739 | save_marker (j_decompress_ptr cinfo) |
||
740 | /* Save an APPn or COM marker into the marker list */ |
||
741 | { |
||
742 | my_marker_ptr marker = (my_marker_ptr) cinfo->marker; |
||
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) |
||
845 | skip_variable (j_decompress_ptr cinfo) |
||
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) |
||
874 | next_marker (j_decompress_ptr cinfo) |
||
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) |
||
921 | first_marker (j_decompress_ptr cinfo) |
||
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) |
||
952 | read_markers (j_decompress_ptr cinfo) |
||
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) |
||
1113 | read_restart_marker (j_decompress_ptr cinfo) |
||
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) |
||
1192 | jpeg_resync_to_restart (j_decompress_ptr cinfo, int desired) |
||
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) |
||
1242 | reset_marker_reader (j_decompress_ptr cinfo) |
||
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) |
||
1262 | jinit_marker_reader (j_decompress_ptr cinfo) |
||
1263 | { |
||
1264 | my_marker_ptr marker; |
||
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, |
||
1270 | SIZEOF(my_marker_reader)); |
||
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) |
||
1300 | jpeg_save_markers (j_decompress_ptr cinfo, int marker_code, |
||
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) |
||
1321 | length_limit = APP0_DATA_LEN; |
||
1322 | else if (marker_code == (int) M_APP14 && length_limit < APP14_DATA_LEN) |
||
1323 | 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) |
||
1349 | jpeg_set_marker_processor (j_decompress_ptr cinfo, int marker_code, |
||
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 | }=>=>>>>>>>>>>><>><>><>><>><>>>>>=>>>>>>=>=>=>>><> |