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Added DoSetSize and DoMoveWindow to generic wxStaticLine.
[wxWidgets.git] / src / png / pngpread.c
CommitLineData
75b6e0a0
GD		 1
2/* pngpread.c - read a png file in push mode
3 *
4946a942 4 * libpng 1.2.4 - July 8, 2002
75b6e0a0 5 * For conditions of distribution and use, see copyright notice in png.h
4946a942
GD		 6 * Copyright (c) 1998-2002 Glenn Randers-Pehrson
7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
75b6e0a0
GD		 9 */
10
11#define PNG_INTERNAL
12#include "png.h"
13
14#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
15
4946a942
GD		 16/* push model modes */
17#define PNG_READ_SIG_MODE 0
18#define PNG_READ_CHUNK_MODE 1
19#define PNG_READ_IDAT_MODE 2
20#define PNG_SKIP_MODE 3
21#define PNG_READ_tEXt_MODE 4
22#define PNG_READ_zTXt_MODE 5
23#define PNG_READ_DONE_MODE 6
24#define PNG_READ_iTXt_MODE 7
25#define PNG_ERROR_MODE 8
26
27void PNGAPI
75b6e0a0
GD		 28png_process_data(png_structp png_ptr, png_infop info_ptr,
29 png_bytep buffer, png_size_t buffer_size)
30{
31 png_push_restore_buffer(png_ptr, buffer, buffer_size);
32
33 while (png_ptr->buffer_size)
34 {
35 png_process_some_data(png_ptr, info_ptr);
36 }
37}
38
39/* What we do with the incoming data depends on what we were previously
40 * doing before we ran out of data...
41 */
4946a942 42void /* PRIVATE */
75b6e0a0
GD		 43png_process_some_data(png_structp png_ptr, png_infop info_ptr)
44{
45 switch (png_ptr->process_mode)
46 {
47 case PNG_READ_SIG_MODE:
48 {
49 png_push_read_sig(png_ptr, info_ptr);
50 break;
51 }
52 case PNG_READ_CHUNK_MODE:
53 {
54 png_push_read_chunk(png_ptr, info_ptr);
55 break;
56 }
57 case PNG_READ_IDAT_MODE:
58 {
59 png_push_read_IDAT(png_ptr);
60 break;
61 }
62#if defined(PNG_READ_tEXt_SUPPORTED)
63 case PNG_READ_tEXt_MODE:
64 {
65 png_push_read_tEXt(png_ptr, info_ptr);
66 break;
67 }
68#endif
69#if defined(PNG_READ_zTXt_SUPPORTED)
70 case PNG_READ_zTXt_MODE:
71 {
72 png_push_read_zTXt(png_ptr, info_ptr);
73 break;
74 }
4946a942
GD		 75#endif
76#if defined(PNG_READ_iTXt_SUPPORTED)
77 case PNG_READ_iTXt_MODE:
78 {
79 png_push_read_iTXt(png_ptr, info_ptr);
80 break;
81 }
75b6e0a0
GD		 82#endif
83 case PNG_SKIP_MODE:
84 {
85 png_push_crc_finish(png_ptr);
86 break;
87 }
88 default:
89 {
90 png_ptr->buffer_size = 0;
91 break;
92 }
93 }
94}
95
96/* Read any remaining signature bytes from the stream and compare them with
97 * the correct PNG signature. It is possible that this routine is called
98 * with bytes already read from the signature, either because they have been
99 * checked by the calling application, or because of multiple calls to this
100 * routine.
101 */
4946a942 102void /* PRIVATE */
75b6e0a0
GD		 103png_push_read_sig(png_structp png_ptr, png_infop info_ptr)
104{
105 png_size_t num_checked = png_ptr->sig_bytes,
106 num_to_check = 8 - num_checked;
107
108 if (png_ptr->buffer_size < num_to_check)
109 {
110 num_to_check = png_ptr->buffer_size;
111 }
112
113 png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]),
114 num_to_check);
4946a942 115 png_ptr->sig_bytes = (png_byte)(png_ptr->sig_bytes+num_to_check);
75b6e0a0
GD		 116
117 if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
118 {
119 if (num_checked < 4 &&
120 png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
121 png_error(png_ptr, "Not a PNG file");
122 else
123 png_error(png_ptr, "PNG file corrupted by ASCII conversion");
124 }
125 else
126 {
127 if (png_ptr->sig_bytes >= 8)
128 {
129 png_ptr->process_mode = PNG_READ_CHUNK_MODE;
130 }
131 }
132}
133
4946a942 134void /* PRIVATE */
75b6e0a0
GD		 135png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
136{
4946a942
GD		 137#ifdef PNG_USE_LOCAL_ARRAYS
138 PNG_IHDR;
139 PNG_IDAT;
140 PNG_IEND;
141 PNG_PLTE;
142#if defined(PNG_READ_bKGD_SUPPORTED)
143 PNG_bKGD;
144#endif
145#if defined(PNG_READ_cHRM_SUPPORTED)
146 PNG_cHRM;
147#endif
148#if defined(PNG_READ_gAMA_SUPPORTED)
149 PNG_gAMA;
150#endif
151#if defined(PNG_READ_hIST_SUPPORTED)
152 PNG_hIST;
153#endif
154#if defined(PNG_READ_iCCP_SUPPORTED)
155 PNG_iCCP;
156#endif
157#if defined(PNG_READ_iTXt_SUPPORTED)
158 PNG_iTXt;
159#endif
160#if defined(PNG_READ_oFFs_SUPPORTED)
161 PNG_oFFs;
162#endif
163#if defined(PNG_READ_pCAL_SUPPORTED)
164 PNG_pCAL;
165#endif
166#if defined(PNG_READ_pHYs_SUPPORTED)
167 PNG_pHYs;
168#endif
169#if defined(PNG_READ_sBIT_SUPPORTED)
170 PNG_sBIT;
171#endif
172#if defined(PNG_READ_sCAL_SUPPORTED)
173 PNG_sCAL;
174#endif
175#if defined(PNG_READ_sRGB_SUPPORTED)
176 PNG_sRGB;
177#endif
178#if defined(PNG_READ_sPLT_SUPPORTED)
179 PNG_sPLT;
180#endif
181#if defined(PNG_READ_tEXt_SUPPORTED)
182 PNG_tEXt;
183#endif
184#if defined(PNG_READ_tIME_SUPPORTED)
185 PNG_tIME;
186#endif
187#if defined(PNG_READ_tRNS_SUPPORTED)
188 PNG_tRNS;
189#endif
190#if defined(PNG_READ_zTXt_SUPPORTED)
191 PNG_zTXt;
192#endif
193#endif /* PNG_USE_LOCAL_ARRAYS */
75b6e0a0
GD		 194 /* First we make sure we have enough data for the 4 byte chunk name
195 * and the 4 byte chunk length before proceeding with decoding the
196 * chunk data. To fully decode each of these chunks, we also make
197 * sure we have enough data in the buffer for the 4 byte CRC at the
198 * end of every chunk (except IDAT, which is handled separately).
199 */
4946a942 200 if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
75b6e0a0
GD		 201 {
202 png_byte chunk_length[4];
203
204 if (png_ptr->buffer_size < 8)
205 {
206 png_push_save_buffer(png_ptr);
207 return;
208 }
209
210 png_push_fill_buffer(png_ptr, chunk_length, 4);
211 png_ptr->push_length = png_get_uint_32(chunk_length);
212 png_reset_crc(png_ptr);
213 png_crc_read(png_ptr, png_ptr->chunk_name, 4);
4946a942 214 png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
75b6e0a0
GD		 215 }
216
217 if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
218 {
219 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
220 {
221 png_push_save_buffer(png_ptr);
222 return;
223 }
75b6e0a0
GD		 224 png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length);
225 }
226 else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
227 {
228 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
229 {
230 png_push_save_buffer(png_ptr);
231 return;
232 }
75b6e0a0
GD		 233 png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length);
234 }
4946a942 235 else if (!png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4))
75b6e0a0
GD		 236 {
237 /* If we reach an IDAT chunk, this means we have read all of the
238 * header chunks, and we can start reading the image (or if this
239 * is called after the image has been read - we have an error).
240 */
4946a942
GD		 241 if (!(png_ptr->mode & PNG_HAVE_IHDR))
242 png_error(png_ptr, "Missing IHDR before IDAT");
243 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
244 !(png_ptr->mode & PNG_HAVE_PLTE))
245 png_error(png_ptr, "Missing PLTE before IDAT");
246
75b6e0a0
GD		 247 if (png_ptr->mode & PNG_HAVE_IDAT)
248 {
249 if (png_ptr->push_length == 0)
250 return;
251
252 if (png_ptr->mode & PNG_AFTER_IDAT)
253 png_error(png_ptr, "Too many IDAT's found");
254 }
255
256 png_ptr->idat_size = png_ptr->push_length;
257 png_ptr->mode |= PNG_HAVE_IDAT;
258 png_ptr->process_mode = PNG_READ_IDAT_MODE;
259 png_push_have_info(png_ptr, info_ptr);
260 png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
261 png_ptr->zstream.next_out = png_ptr->row_buf;
262 return;
263 }
264 else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
265 {
266 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
267 {
268 png_push_save_buffer(png_ptr);
269 return;
270 }
75b6e0a0 271 png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length);
4946a942 272
75b6e0a0
GD		 273 png_ptr->process_mode = PNG_READ_DONE_MODE;
274 png_push_have_end(png_ptr, info_ptr);
275 }
276#if defined(PNG_READ_gAMA_SUPPORTED)
277 else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
278 {
279 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
280 {
281 png_push_save_buffer(png_ptr);
282 return;
283 }
75b6e0a0
GD		 284 png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length);
285 }
286#endif
287#if defined(PNG_READ_sBIT_SUPPORTED)
288 else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
289 {
290 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
291 {
292 png_push_save_buffer(png_ptr);
293 return;
294 }
75b6e0a0
GD		 295 png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length);
296 }
297#endif
298#if defined(PNG_READ_cHRM_SUPPORTED)
299 else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
300 {
301 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
302 {
303 png_push_save_buffer(png_ptr);
304 return;
305 }
75b6e0a0
GD		 306 png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length);
307 }
308#endif
309#if defined(PNG_READ_sRGB_SUPPORTED)
310 else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
311 {
312 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
313 {
314 png_push_save_buffer(png_ptr);
315 return;
316 }
75b6e0a0
GD		 317 png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length);
318 }
319#endif
4946a942
GD		 320#if defined(PNG_READ_iCCP_SUPPORTED)
321 else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
322 {
323 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
324 {
325 png_push_save_buffer(png_ptr);
326 return;
327 }
328 png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length);
329 }
330#endif
331#if defined(PNG_READ_sPLT_SUPPORTED)
332 else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
333 {
334 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
335 {
336 png_push_save_buffer(png_ptr);
337 return;
338 }
339 png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length);
340 }
341#endif
75b6e0a0
GD		 342#if defined(PNG_READ_tRNS_SUPPORTED)
343 else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
344 {
345 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
346 {
347 png_push_save_buffer(png_ptr);
348 return;
349 }
75b6e0a0
GD		 350 png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length);
351 }
352#endif
353#if defined(PNG_READ_bKGD_SUPPORTED)
354 else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
355 {
356 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
357 {
358 png_push_save_buffer(png_ptr);
359 return;
360 }
75b6e0a0
GD		 361 png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length);
362 }
363#endif
364#if defined(PNG_READ_hIST_SUPPORTED)
365 else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
366 {
367 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
368 {
369 png_push_save_buffer(png_ptr);
370 return;
371 }
75b6e0a0
GD		 372 png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length);
373 }
374#endif
375#if defined(PNG_READ_pHYs_SUPPORTED)
376 else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
377 {
378 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
379 {
380 png_push_save_buffer(png_ptr);
381 return;
382 }
75b6e0a0
GD		 383 png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length);
384 }
385#endif
386#if defined(PNG_READ_oFFs_SUPPORTED)
387 else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
388 {
389 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
390 {
391 png_push_save_buffer(png_ptr);
392 return;
393 }
75b6e0a0
GD		 394 png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length);
395 }
396#endif
397#if defined(PNG_READ_pCAL_SUPPORTED)
398 else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
399 {
400 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
401 {
402 png_push_save_buffer(png_ptr);
403 return;
404 }
75b6e0a0
GD		 405 png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length);
406 }
407#endif
4946a942
GD		 408#if defined(PNG_READ_sCAL_SUPPORTED)
409 else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
410 {
411 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
412 {
413 png_push_save_buffer(png_ptr);
414 return;
415 }
416 png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length);
417 }
418#endif
75b6e0a0
GD		 419#if defined(PNG_READ_tIME_SUPPORTED)
420 else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
421 {
422 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
423 {
424 png_push_save_buffer(png_ptr);
425 return;
426 }
75b6e0a0
GD		 427 png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length);
428 }
429#endif
430#if defined(PNG_READ_tEXt_SUPPORTED)
431 else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
432 {
4946a942
GD		 433 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
434 {
435 png_push_save_buffer(png_ptr);
436 return;
437 }
75b6e0a0
GD		 438 png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length);
439 }
440#endif
441#if defined(PNG_READ_zTXt_SUPPORTED)
442 else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
443 {
4946a942
GD		 444 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
445 {
446 png_push_save_buffer(png_ptr);
447 return;
448 }
75b6e0a0
GD		 449 png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length);
450 }
4946a942
GD		 451#endif
452#if defined(PNG_READ_iTXt_SUPPORTED)
453 else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
454 {
455 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
456 {
457 png_push_save_buffer(png_ptr);
458 return;
459 }
460 png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
461 }
75b6e0a0
GD		 462#endif
463 else
464 {
4946a942
GD		 465 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
466 {
467 png_push_save_buffer(png_ptr);
468 return;
469 }
75b6e0a0
GD		 470 png_push_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
471 }
472
4946a942 473 png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
75b6e0a0
GD		 474}
475
4946a942 476void /* PRIVATE */
75b6e0a0
GD		 477png_push_crc_skip(png_structp png_ptr, png_uint_32 skip)
478{
479 png_ptr->process_mode = PNG_SKIP_MODE;
480 png_ptr->skip_length = skip;
481}
482
4946a942 483void /* PRIVATE */
75b6e0a0
GD		 484png_push_crc_finish(png_structp png_ptr)
485{
486 if (png_ptr->skip_length && png_ptr->save_buffer_size)
487 {
488 png_size_t save_size;
489
490 if (png_ptr->skip_length < (png_uint_32)png_ptr->save_buffer_size)
491 save_size = (png_size_t)png_ptr->skip_length;
492 else
493 save_size = png_ptr->save_buffer_size;
494
495 png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
496
497 png_ptr->skip_length -= save_size;
498 png_ptr->buffer_size -= save_size;
499 png_ptr->save_buffer_size -= save_size;
500 png_ptr->save_buffer_ptr += save_size;
501 }
502 if (png_ptr->skip_length && png_ptr->current_buffer_size)
503 {
504 png_size_t save_size;
505
506 if (png_ptr->skip_length < (png_uint_32)png_ptr->current_buffer_size)
507 save_size = (png_size_t)png_ptr->skip_length;
508 else
509 save_size = png_ptr->current_buffer_size;
510
511 png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
512
513 png_ptr->skip_length -= save_size;
514 png_ptr->buffer_size -= save_size;
515 png_ptr->current_buffer_size -= save_size;
516 png_ptr->current_buffer_ptr += save_size;
517 }
518 if (!png_ptr->skip_length)
519 {
520 if (png_ptr->buffer_size < 4)
521 {
522 png_push_save_buffer(png_ptr);
523 return;
524 }
525
526 png_crc_finish(png_ptr, 0);
527 png_ptr->process_mode = PNG_READ_CHUNK_MODE;
528 }
529}
530
4946a942 531void PNGAPI
75b6e0a0
GD		 532png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
533{
534 png_bytep ptr;
535
536 ptr = buffer;
537 if (png_ptr->save_buffer_size)
538 {
539 png_size_t save_size;
540
541 if (length < png_ptr->save_buffer_size)
542 save_size = length;
543 else
544 save_size = png_ptr->save_buffer_size;
545
546 png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size);
547 length -= save_size;
548 ptr += save_size;
549 png_ptr->buffer_size -= save_size;
550 png_ptr->save_buffer_size -= save_size;
551 png_ptr->save_buffer_ptr += save_size;
552 }
553 if (length && png_ptr->current_buffer_size)
554 {
555 png_size_t save_size;
556
557 if (length < png_ptr->current_buffer_size)
558 save_size = length;
559 else
560 save_size = png_ptr->current_buffer_size;
561
562 png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size);
563 png_ptr->buffer_size -= save_size;
564 png_ptr->current_buffer_size -= save_size;
565 png_ptr->current_buffer_ptr += save_size;
566 }
567}
568
4946a942 569void /* PRIVATE */
75b6e0a0
GD		 570png_push_save_buffer(png_structp png_ptr)
571{
572 if (png_ptr->save_buffer_size)
573 {
574 if (png_ptr->save_buffer_ptr != png_ptr->save_buffer)
575 {
576 png_size_t i,istop;
577 png_bytep sp;
578 png_bytep dp;
579
580 istop = png_ptr->save_buffer_size;
581 for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer;
582 i < istop; i++, sp++, dp++)
583 {
584 *dp = *sp;
585 }
586 }
587 }
588 if (png_ptr->save_buffer_size + png_ptr->current_buffer_size >
589 png_ptr->save_buffer_max)
590 {
591 png_size_t new_max;
592 png_bytep old_buffer;
593
594 new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
595 old_buffer = png_ptr->save_buffer;
596 png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr,
597 (png_uint_32)new_max);
598 png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size);
599 png_free(png_ptr, old_buffer);
600 png_ptr->save_buffer_max = new_max;
601 }
602 if (png_ptr->current_buffer_size)
603 {
604 png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size,
605 png_ptr->current_buffer_ptr, png_ptr->current_buffer_size);
606 png_ptr->save_buffer_size += png_ptr->current_buffer_size;
607 png_ptr->current_buffer_size = 0;
608 }
609 png_ptr->save_buffer_ptr = png_ptr->save_buffer;
610 png_ptr->buffer_size = 0;
611}
612
4946a942 613void /* PRIVATE */
75b6e0a0
GD		 614png_push_restore_buffer(png_structp png_ptr, png_bytep buffer,
615 png_size_t buffer_length)
616{
617 png_ptr->current_buffer = buffer;
618 png_ptr->current_buffer_size = buffer_length;
619 png_ptr->buffer_size = buffer_length + png_ptr->save_buffer_size;
620 png_ptr->current_buffer_ptr = png_ptr->current_buffer;
621}
622
4946a942 623void /* PRIVATE */
75b6e0a0
GD		 624png_push_read_IDAT(png_structp png_ptr)
625{
4946a942
GD		 626#ifdef PNG_USE_LOCAL_ARRAYS
627 PNG_IDAT;
628#endif
629 if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
75b6e0a0
GD		 630 {
631 png_byte chunk_length[4];
632
633 if (png_ptr->buffer_size < 8)
634 {
635 png_push_save_buffer(png_ptr);
636 return;
637 }
638
639 png_push_fill_buffer(png_ptr, chunk_length, 4);
640 png_ptr->push_length = png_get_uint_32(chunk_length);
641
642 png_reset_crc(png_ptr);
643 png_crc_read(png_ptr, png_ptr->chunk_name, 4);
4946a942 644 png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
75b6e0a0 645
4946a942 646 if (png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4))
75b6e0a0
GD		 647 {
648 png_ptr->process_mode = PNG_READ_CHUNK_MODE;
649 if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
650 png_error(png_ptr, "Not enough compressed data");
651 return;
652 }
653
654 png_ptr->idat_size = png_ptr->push_length;
655 }
656 if (png_ptr->idat_size && png_ptr->save_buffer_size)
657 {
658 png_size_t save_size;
659
660 if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size)
661 {
662 save_size = (png_size_t)png_ptr->idat_size;
663 /* check for overflow */
664 if((png_uint_32)save_size != png_ptr->idat_size)
665 png_error(png_ptr, "save_size overflowed in pngpread");
666 }
667 else
668 save_size = png_ptr->save_buffer_size;
669
670 png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
671 png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size);
672
673 png_ptr->idat_size -= save_size;
674 png_ptr->buffer_size -= save_size;
675 png_ptr->save_buffer_size -= save_size;
676 png_ptr->save_buffer_ptr += save_size;
677 }
678 if (png_ptr->idat_size && png_ptr->current_buffer_size)
679 {
680 png_size_t save_size;
681
682 if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size)
683 {
684 save_size = (png_size_t)png_ptr->idat_size;
685 /* check for overflow */
686 if((png_uint_32)save_size != png_ptr->idat_size)
687 png_error(png_ptr, "save_size overflowed in pngpread");
688 }
689 else
690 save_size = png_ptr->current_buffer_size;
691
692 png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
693 png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size);
694
695 png_ptr->idat_size -= save_size;
696 png_ptr->buffer_size -= save_size;
697 png_ptr->current_buffer_size -= save_size;
698 png_ptr->current_buffer_ptr += save_size;
699 }
700 if (!png_ptr->idat_size)
701 {
702 if (png_ptr->buffer_size < 4)
703 {
704 png_push_save_buffer(png_ptr);
705 return;
706 }
707
708 png_crc_finish(png_ptr, 0);
4946a942 709 png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
75b6e0a0
GD		 710 }
711}
712
4946a942 713void /* PRIVATE */
75b6e0a0
GD		 714png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
715 png_size_t buffer_length)
716{
717 int ret;
718
719 if ((png_ptr->flags & PNG_FLAG_ZLIB_FINISHED) && buffer_length)
720 png_error(png_ptr, "Extra compression data");
721
722 png_ptr->zstream.next_in = buffer;
723 png_ptr->zstream.avail_in = (uInt)buffer_length;
724 for(;;)
725 {
726 ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
4946a942 727 if (ret != Z_OK)
75b6e0a0 728 {
4946a942 729 if (ret == Z_STREAM_END)
75b6e0a0 730 {
4946a942
GD		 731 if (png_ptr->zstream.avail_in)
732 png_error(png_ptr, "Extra compressed data");
733 if (!(png_ptr->zstream.avail_out))
734 {
735 png_push_process_row(png_ptr);
736 }
75b6e0a0 737
4946a942
GD		 738 png_ptr->mode |= PNG_AFTER_IDAT;
739 png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
740 break;
741 }
742 else if (ret == Z_BUF_ERROR)
743 break;
744 else
745 png_error(png_ptr, "Decompression Error");
75b6e0a0 746 }
75b6e0a0
GD		 747 if (!(png_ptr->zstream.avail_out))
748 {
4946a942
GD		 749 if ((
750#if defined(PNG_READ_INTERLACING_SUPPORTED)
751 png_ptr->interlaced && png_ptr->pass > 6) ||
752 (!png_ptr->interlaced &&
753#endif
754 png_ptr->row_number == png_ptr->num_rows-1))
755 png_error(png_ptr, "Too much data in IDAT chunks");
75b6e0a0
GD		 756 png_push_process_row(png_ptr);
757 png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
758 png_ptr->zstream.next_out = png_ptr->row_buf;
759 }
760 else
761 break;
762 }
763}
764
4946a942 765void /* PRIVATE */
75b6e0a0
GD		 766png_push_process_row(png_structp png_ptr)
767{
768 png_ptr->row_info.color_type = png_ptr->color_type;
769 png_ptr->row_info.width = png_ptr->iwidth;
770 png_ptr->row_info.channels = png_ptr->channels;
771 png_ptr->row_info.bit_depth = png_ptr->bit_depth;
772 png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
773
774 png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
775 (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
776
777 png_read_filter_row(png_ptr, &(png_ptr->row_info),
778 png_ptr->row_buf + 1, png_ptr->prev_row + 1,
779 (int)(png_ptr->row_buf[0]));
780
781 png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
782 png_ptr->rowbytes + 1);
783
784 if (png_ptr->transformations)
785 png_do_read_transformations(png_ptr);
786
787#if defined(PNG_READ_INTERLACING_SUPPORTED)
788 /* blow up interlaced rows to full size */
789 if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
790 {
791 if (png_ptr->pass < 6)
4946a942 792/* old interface (pre-1.0.9):
75b6e0a0
GD		 793 png_do_read_interlace(&(png_ptr->row_info),
794 png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
4946a942
GD		 795 */
796 png_do_read_interlace(png_ptr);
75b6e0a0 797
4946a942
GD		 798 switch (png_ptr->pass)
799 {
75b6e0a0
GD		 800 case 0:
801 {
802 int i;
803 for (i = 0; i < 8 && png_ptr->pass == 0; i++)
804 {
805 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
4946a942
GD		 806 png_read_push_finish_row(png_ptr); /* updates png_ptr->pass */
807 }
808 if (png_ptr->pass == 2) /* pass 1 might be empty */
809 {
810 for (i = 0; i < 4 && png_ptr->pass == 2; i++)
811 {
812 png_push_have_row(png_ptr, png_bytep_NULL);
813 png_read_push_finish_row(png_ptr);
814 }
815 }
816 if (png_ptr->pass == 4 && png_ptr->height <= 4)
817 {
818 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
819 {
820 png_push_have_row(png_ptr, png_bytep_NULL);
821 png_read_push_finish_row(png_ptr);
822 }
823 }
824 if (png_ptr->pass == 6 && png_ptr->height <= 4)
825 {
826 png_push_have_row(png_ptr, png_bytep_NULL);
827 png_read_push_finish_row(png_ptr);
75b6e0a0
GD		 828 }
829 break;
830 }
831 case 1:
832 {
833 int i;
834 for (i = 0; i < 8 && png_ptr->pass == 1; i++)
835 {
836 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
837 png_read_push_finish_row(png_ptr);
838 }
4946a942 839 if (png_ptr->pass == 2) /* skip top 4 generated rows */
75b6e0a0
GD		 840 {
841 for (i = 0; i < 4 && png_ptr->pass == 2; i++)
842 {
4946a942 843 png_push_have_row(png_ptr, png_bytep_NULL);
75b6e0a0
GD		 844 png_read_push_finish_row(png_ptr);
845 }
846 }
847 break;
848 }
849 case 2:
850 {
851 int i;
852 for (i = 0; i < 4 && png_ptr->pass == 2; i++)
853 {
854 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
855 png_read_push_finish_row(png_ptr);
856 }
857 for (i = 0; i < 4 && png_ptr->pass == 2; i++)
858 {
4946a942 859 png_push_have_row(png_ptr, png_bytep_NULL);
75b6e0a0
GD		 860 png_read_push_finish_row(png_ptr);
861 }
4946a942
GD		 862 if (png_ptr->pass == 4) /* pass 3 might be empty */
863 {
864 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
865 {
866 png_push_have_row(png_ptr, png_bytep_NULL);
867 png_read_push_finish_row(png_ptr);
868 }
869 }
75b6e0a0
GD		 870 break;
871 }
872 case 3:
873 {
874 int i;
875 for (i = 0; i < 4 && png_ptr->pass == 3; i++)
876 {
877 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
878 png_read_push_finish_row(png_ptr);
879 }
4946a942 880 if (png_ptr->pass == 4) /* skip top two generated rows */
75b6e0a0
GD		 881 {
882 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
883 {
4946a942 884 png_push_have_row(png_ptr, png_bytep_NULL);
75b6e0a0
GD		 885 png_read_push_finish_row(png_ptr);
886 }
887 }
888 break;
889 }
890 case 4:
891 {
892 int i;
893 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
894 {
895 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
896 png_read_push_finish_row(png_ptr);
897 }
898 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
899 {
4946a942
GD		 900 png_push_have_row(png_ptr, png_bytep_NULL);
901 png_read_push_finish_row(png_ptr);
902 }
903 if (png_ptr->pass == 6) /* pass 5 might be empty */
904 {
905 png_push_have_row(png_ptr, png_bytep_NULL);
75b6e0a0
GD		 906 png_read_push_finish_row(png_ptr);
907 }
908 break;
909 }
910 case 5:
911 {
912 int i;
913 for (i = 0; i < 2 && png_ptr->pass == 5; i++)
914 {
915 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
916 png_read_push_finish_row(png_ptr);
917 }
4946a942 918 if (png_ptr->pass == 6) /* skip top generated row */
75b6e0a0 919 {
4946a942 920 png_push_have_row(png_ptr, png_bytep_NULL);
75b6e0a0
GD		 921 png_read_push_finish_row(png_ptr);
922 }
923 break;
924 }
925 case 6:
926 {
927 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
928 png_read_push_finish_row(png_ptr);
929 if (png_ptr->pass != 6)
930 break;
4946a942 931 png_push_have_row(png_ptr, png_bytep_NULL);
75b6e0a0
GD		 932 png_read_push_finish_row(png_ptr);
933 }
934 }
935 }
936 else
937#endif
938 {
939 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
940 png_read_push_finish_row(png_ptr);
941 }
942}
943
4946a942 944void /* PRIVATE */
75b6e0a0
GD		 945png_read_push_finish_row(png_structp png_ptr)
946{
4946a942
GD		 947#ifdef PNG_USE_LOCAL_ARRAYS
948 /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
949
950 /* start of interlace block */
951 const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
952
953 /* offset to next interlace block */
954 const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
955
956 /* start of interlace block in the y direction */
957 const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
958
959 /* offset to next interlace block in the y direction */
960 const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
961
962 /* Width of interlace block. This is not currently used - if you need
963 * it, uncomment it here and in png.h
964 const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
965 */
966
967 /* Height of interlace block. This is not currently used - if you need
968 * it, uncomment it here and in png.h
969 const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
970 */
971#endif
972
75b6e0a0
GD		 973 png_ptr->row_number++;
974 if (png_ptr->row_number < png_ptr->num_rows)
975 return;
976
977 if (png_ptr->interlaced)
978 {
979 png_ptr->row_number = 0;
980 png_memset_check(png_ptr, png_ptr->prev_row, 0,
981 png_ptr->rowbytes + 1);
982 do
983 {
984 png_ptr->pass++;
4946a942
GD		 985 if ((png_ptr->pass == 1 && png_ptr->width < 5) ||
986 (png_ptr->pass == 3 && png_ptr->width < 3) ||
987 (png_ptr->pass == 5 && png_ptr->width < 2))
988 png_ptr->pass++;
989
75b6e0a0
GD		 990 if (png_ptr->pass >= 7)
991 break;
992
993 png_ptr->iwidth = (png_ptr->width +
994 png_pass_inc[png_ptr->pass] - 1 -
995 png_pass_start[png_ptr->pass]) /
996 png_pass_inc[png_ptr->pass];
997
998 png_ptr->irowbytes = ((png_ptr->iwidth *
999 png_ptr->pixel_depth + 7) >> 3) + 1;
1000
1001 if (png_ptr->transformations & PNG_INTERLACE)
1002 break;
1003
1004 png_ptr->num_rows = (png_ptr->height +
1005 png_pass_yinc[png_ptr->pass] - 1 -
1006 png_pass_ystart[png_ptr->pass]) /
1007 png_pass_yinc[png_ptr->pass];
1008
1009 } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0);
1010 }
1011}
1012
1013#if defined(PNG_READ_tEXt_SUPPORTED)
4946a942
GD		 1014void /* PRIVATE */
1015png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
1016 length)
75b6e0a0 1017{
4946a942 1018 if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
75b6e0a0
GD		 1019 {
1020 png_error(png_ptr, "Out of place tEXt");
1021 /* to quiet some compiler warnings */
1022 if(info_ptr == NULL) return;
1023 }
1024
1025#ifdef PNG_MAX_MALLOC_64K
1026 png_ptr->skip_length = 0; /* This may not be necessary */
1027
4946a942 1028 if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
75b6e0a0
GD		 1029 {
1030 png_warning(png_ptr, "tEXt chunk too large to fit in memory");
1031 png_ptr->skip_length = length - (png_uint_32)65535L;
1032 length = (png_uint_32)65535L;
1033 }
1034#endif
1035
1036 png_ptr->current_text = (png_charp)png_malloc(png_ptr,
1037 (png_uint_32)(length+1));
1038 png_ptr->current_text[length] = '\0';
1039 png_ptr->current_text_ptr = png_ptr->current_text;
1040 png_ptr->current_text_size = (png_size_t)length;
1041 png_ptr->current_text_left = (png_size_t)length;
1042 png_ptr->process_mode = PNG_READ_tEXt_MODE;
1043}
1044
4946a942 1045void /* PRIVATE */
75b6e0a0
GD		 1046png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
1047{
1048 if (png_ptr->buffer_size && png_ptr->current_text_left)
1049 {
1050 png_size_t text_size;
1051
1052 if (png_ptr->buffer_size < png_ptr->current_text_left)
1053 text_size = png_ptr->buffer_size;
1054 else
1055 text_size = png_ptr->current_text_left;
1056 png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
1057 png_ptr->current_text_left -= text_size;
1058 png_ptr->current_text_ptr += text_size;
1059 }
1060 if (!(png_ptr->current_text_left))
1061 {
1062 png_textp text_ptr;
1063 png_charp text;
1064 png_charp key;
4946a942 1065 int ret;
75b6e0a0
GD		 1066
1067 if (png_ptr->buffer_size < 4)
1068 {
1069 png_push_save_buffer(png_ptr);
1070 return;
1071 }
1072
1073 png_push_crc_finish(png_ptr);
1074
1075#if defined(PNG_MAX_MALLOC_64K)
1076 if (png_ptr->skip_length)
1077 return;
1078#endif
1079
1080 key = png_ptr->current_text;
75b6e0a0
GD		 1081
1082 for (text = key; *text; text++)
1083 /* empty loop */ ;
1084
1085 if (text != key + png_ptr->current_text_size)
1086 text++;
1087
1088 text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
1089 text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
1090 text_ptr->key = key;
4946a942
GD		 1091#ifdef PNG_iTXt_SUPPORTED
1092 text_ptr->lang = NULL;
1093 text_ptr->lang_key = NULL;
1094#endif
75b6e0a0
GD		 1095 text_ptr->text = text;
1096
4946a942 1097 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
75b6e0a0 1098
4946a942 1099 png_free(png_ptr, key);
75b6e0a0 1100 png_free(png_ptr, text_ptr);
4946a942
GD		 1101 png_ptr->current_text = NULL;
1102
1103 if (ret)
1104 png_warning(png_ptr, "Insufficient memory to store text chunk.");
75b6e0a0
GD		 1105 }
1106}
1107#endif
1108
1109#if defined(PNG_READ_zTXt_SUPPORTED)
4946a942
GD		 1110void /* PRIVATE */
1111png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
1112 length)
75b6e0a0 1113{
4946a942 1114 if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
75b6e0a0
GD		 1115 {
1116 png_error(png_ptr, "Out of place zTXt");
1117 /* to quiet some compiler warnings */
1118 if(info_ptr == NULL) return;
1119 }
1120
1121#ifdef PNG_MAX_MALLOC_64K
1122 /* We can't handle zTXt chunks > 64K, since we don't have enough space
1123 * to be able to store the uncompressed data. Actually, the threshold
1124 * is probably around 32K, but it isn't as definite as 64K is.
1125 */
1126 if (length > (png_uint_32)65535L)
1127 {
1128 png_warning(png_ptr, "zTXt chunk too large to fit in memory");
1129 png_push_crc_skip(png_ptr, length);
1130 return;
1131 }
1132#endif
1133
1134 png_ptr->current_text = (png_charp)png_malloc(png_ptr,
1135 (png_uint_32)(length+1));
1136 png_ptr->current_text[length] = '\0';
1137 png_ptr->current_text_ptr = png_ptr->current_text;
1138 png_ptr->current_text_size = (png_size_t)length;
1139 png_ptr->current_text_left = (png_size_t)length;
1140 png_ptr->process_mode = PNG_READ_zTXt_MODE;
1141}
1142
4946a942 1143void /* PRIVATE */
75b6e0a0
GD		 1144png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
1145{
1146 if (png_ptr->buffer_size && png_ptr->current_text_left)
1147 {
1148 png_size_t text_size;
1149
1150 if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left)
1151 text_size = png_ptr->buffer_size;
1152 else
1153 text_size = png_ptr->current_text_left;
1154 png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
1155 png_ptr->current_text_left -= text_size;
1156 png_ptr->current_text_ptr += text_size;
1157 }
1158 if (!(png_ptr->current_text_left))
1159 {
1160 png_textp text_ptr;
1161 png_charp text;
1162 png_charp key;
1163 int ret;
1164 png_size_t text_size, key_size;
1165
1166 if (png_ptr->buffer_size < 4)
1167 {
1168 png_push_save_buffer(png_ptr);
1169 return;
1170 }
1171
1172 png_push_crc_finish(png_ptr);
1173
1174 key = png_ptr->current_text;
75b6e0a0
GD		 1175
1176 for (text = key; *text; text++)
1177 /* empty loop */ ;
1178
1179 /* zTXt can't have zero text */
1180 if (text == key + png_ptr->current_text_size)
1181 {
4946a942 1182 png_ptr->current_text = NULL;
75b6e0a0
GD		 1183 png_free(png_ptr, key);
1184 return;
1185 }
1186
1187 text++;
1188
1189 if (*text != PNG_TEXT_COMPRESSION_zTXt) /* check compression byte */
1190 {
4946a942 1191 png_ptr->current_text = NULL;
75b6e0a0
GD		 1192 png_free(png_ptr, key);
1193 return;
1194 }
1195
1196 text++;
1197
1198 png_ptr->zstream.next_in = (png_bytep )text;
1199 png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size -
1200 (text - key));
1201 png_ptr->zstream.next_out = png_ptr->zbuf;
1202 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
1203
1204 key_size = text - key;
1205 text_size = 0;
1206 text = NULL;
1207 ret = Z_STREAM_END;
1208
1209 while (png_ptr->zstream.avail_in)
1210 {
1211 ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
1212 if (ret != Z_OK && ret != Z_STREAM_END)
1213 {
1214 inflateReset(&png_ptr->zstream);
1215 png_ptr->zstream.avail_in = 0;
4946a942 1216 png_ptr->current_text = NULL;
75b6e0a0
GD		 1217 png_free(png_ptr, key);
1218 png_free(png_ptr, text);
1219 return;
1220 }
1221 if (!(png_ptr->zstream.avail_out) || ret == Z_STREAM_END)
1222 {
1223 if (text == NULL)
1224 {
1225 text = (png_charp)png_malloc(png_ptr,
4946a942
GD		 1226 (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out
1227 + key_size + 1));
75b6e0a0
GD		 1228 png_memcpy(text + key_size, png_ptr->zbuf,
1229 png_ptr->zbuf_size - png_ptr->zstream.avail_out);
1230 png_memcpy(text, key, key_size);
1231 text_size = key_size + png_ptr->zbuf_size -
1232 png_ptr->zstream.avail_out;
1233 *(text + text_size) = '\0';
1234 }
1235 else
1236 {
1237 png_charp tmp;
1238
1239 tmp = text;
1240 text = (png_charp)png_malloc(png_ptr, text_size +
1241 (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out
1242 + 1));
1243 png_memcpy(text, tmp, text_size);
1244 png_free(png_ptr, tmp);
1245 png_memcpy(text + text_size, png_ptr->zbuf,
1246 png_ptr->zbuf_size - png_ptr->zstream.avail_out);
1247 text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
1248 *(text + text_size) = '\0';
1249 }
1250 if (ret != Z_STREAM_END)
1251 {
1252 png_ptr->zstream.next_out = png_ptr->zbuf;
1253 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
1254 }
1255 }
1256 else
1257 {
1258 break;
1259 }
1260
1261 if (ret == Z_STREAM_END)
1262 break;
1263 }
1264
1265 inflateReset(&png_ptr->zstream);
1266 png_ptr->zstream.avail_in = 0;
1267
1268 if (ret != Z_STREAM_END)
1269 {
4946a942 1270 png_ptr->current_text = NULL;
75b6e0a0
GD		 1271 png_free(png_ptr, key);
1272 png_free(png_ptr, text);
1273 return;
1274 }
1275
4946a942 1276 png_ptr->current_text = NULL;
75b6e0a0
GD		 1277 png_free(png_ptr, key);
1278 key = text;
1279 text += key_size;
1280
1281 text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
1282 text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt;
1283 text_ptr->key = key;
4946a942
GD		 1284#ifdef PNG_iTXt_SUPPORTED
1285 text_ptr->lang = NULL;
1286 text_ptr->lang_key = NULL;
1287#endif
75b6e0a0
GD		 1288 text_ptr->text = text;
1289
4946a942 1290 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
75b6e0a0 1291
4946a942 1292 png_free(png_ptr, key);
75b6e0a0 1293 png_free(png_ptr, text_ptr);
4946a942
GD		 1294
1295 if (ret)
1296 png_warning(png_ptr, "Insufficient memory to store text chunk.");
1297 }
1298}
1299#endif
1300
1301#if defined(PNG_READ_iTXt_SUPPORTED)
1302void /* PRIVATE */
1303png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
1304 length)
1305{
1306 if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
1307 {
1308 png_error(png_ptr, "Out of place iTXt");
1309 /* to quiet some compiler warnings */
1310 if(info_ptr == NULL) return;
1311 }
1312
1313#ifdef PNG_MAX_MALLOC_64K
1314 png_ptr->skip_length = 0; /* This may not be necessary */
1315
1316 if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
1317 {
1318 png_warning(png_ptr, "iTXt chunk too large to fit in memory");
1319 png_ptr->skip_length = length - (png_uint_32)65535L;
1320 length = (png_uint_32)65535L;
1321 }
1322#endif
1323
1324 png_ptr->current_text = (png_charp)png_malloc(png_ptr,
1325 (png_uint_32)(length+1));
1326 png_ptr->current_text[length] = '\0';
1327 png_ptr->current_text_ptr = png_ptr->current_text;
1328 png_ptr->current_text_size = (png_size_t)length;
1329 png_ptr->current_text_left = (png_size_t)length;
1330 png_ptr->process_mode = PNG_READ_iTXt_MODE;
1331}
1332
1333void /* PRIVATE */
1334png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
1335{
1336
1337 if (png_ptr->buffer_size && png_ptr->current_text_left)
1338 {
1339 png_size_t text_size;
1340
1341 if (png_ptr->buffer_size < png_ptr->current_text_left)
1342 text_size = png_ptr->buffer_size;
1343 else
1344 text_size = png_ptr->current_text_left;
1345 png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
1346 png_ptr->current_text_left -= text_size;
1347 png_ptr->current_text_ptr += text_size;
1348 }
1349 if (!(png_ptr->current_text_left))
1350 {
1351 png_textp text_ptr;
1352 png_charp key;
1353 int comp_flag;
1354 png_charp lang;
1355 png_charp lang_key;
1356 png_charp text;
1357 int ret;
1358
1359 if (png_ptr->buffer_size < 4)
1360 {
1361 png_push_save_buffer(png_ptr);
1362 return;
1363 }
1364
1365 png_push_crc_finish(png_ptr);
1366
1367#if defined(PNG_MAX_MALLOC_64K)
1368 if (png_ptr->skip_length)
1369 return;
1370#endif
1371
1372 key = png_ptr->current_text;
1373
1374 for (lang = key; *lang; lang++)
1375 /* empty loop */ ;
1376
1377 if (lang != key + png_ptr->current_text_size)
1378 lang++;
1379
1380 comp_flag = *lang++;
1381 lang++; /* skip comp_type, always zero */
1382
1383 for (lang_key = lang; *lang_key; lang_key++)
1384 /* empty loop */ ;
1385 lang_key++; /* skip NUL separator */
1386
1387 for (text = lang_key; *text; text++)
1388 /* empty loop */ ;
1389
1390 if (text != key + png_ptr->current_text_size)
1391 text++;
1392
1393 text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
1394 text_ptr->compression = comp_flag + 2;
1395 text_ptr->key = key;
1396 text_ptr->lang = lang;
1397 text_ptr->lang_key = lang_key;
1398 text_ptr->text = text;
1399 text_ptr->text_length = 0;
1400 text_ptr->itxt_length = png_strlen(text);
1401
1402 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
1403
1404 png_ptr->current_text = NULL;
1405
1406 png_free(png_ptr, text_ptr);
1407 if (ret)
1408 png_warning(png_ptr, "Insufficient memory to store iTXt chunk.");
75b6e0a0
GD		 1409 }
1410}
1411#endif
1412
1413/* This function is called when we haven't found a handler for this
4946a942
GD		 1414 * chunk. If there isn't a problem with the chunk itself (ie a bad chunk
1415 * name or a critical chunk), the chunk is (currently) silently ignored.
75b6e0a0 1416 */
4946a942
GD		 1417void /* PRIVATE */
1418png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
1419 length)
75b6e0a0 1420{
4946a942 1421 png_uint_32 skip=0;
75b6e0a0
GD		 1422 png_check_chunk_name(png_ptr, png_ptr->chunk_name);
1423
1424 if (!(png_ptr->chunk_name[0] & 0x20))
1425 {
4946a942
GD		 1426#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
1427 if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
1428 HANDLE_CHUNK_ALWAYS
1429#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
1430 && png_ptr->read_user_chunk_fn == NULL
1431#endif
1432 )
1433#endif
1434 png_chunk_error(png_ptr, "unknown critical chunk");
1435
1436 /* to quiet compiler warnings about unused info_ptr */
1437 if (info_ptr == NULL)
1438 return;
75b6e0a0
GD		 1439 }
1440
4946a942
GD		 1441#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
1442 if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
1443 {
1444 png_unknown_chunk chunk;
1445
1446#ifdef PNG_MAX_MALLOC_64K
1447 if (length > (png_uint_32)65535L)
1448 {
1449 png_warning(png_ptr, "unknown chunk too large to fit in memory");
1450 skip = length - (png_uint_32)65535L;
1451 length = (png_uint_32)65535L;
1452 }
1453#endif
1454
1455 png_strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name);
1456 chunk.data = (png_bytep)png_malloc(png_ptr, length);
1457 png_crc_read(png_ptr, chunk.data, length);
1458 chunk.size = length;
1459#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
1460 if(png_ptr->read_user_chunk_fn != NULL)
1461 {
1462 /* callback to user unknown chunk handler */
1463 if ((*(png_ptr->read_user_chunk_fn)) (png_ptr, &chunk) <= 0)
1464 {
1465 if (!(png_ptr->chunk_name[0] & 0x20))
1466 if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
1467 HANDLE_CHUNK_ALWAYS)
1468 png_chunk_error(png_ptr, "unknown critical chunk");
1469 }
1470 png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
1471 }
1472 else
1473#endif
1474 png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
1475 png_free(png_ptr, chunk.data);
1476 }
1477 else
1478#endif
1479 skip=length;
1480 png_push_crc_skip(png_ptr, skip);
75b6e0a0
GD		 1481}
1482
4946a942 1483void /* PRIVATE */
75b6e0a0
GD		 1484png_push_have_info(png_structp png_ptr, png_infop info_ptr)
1485{
1486 if (png_ptr->info_fn != NULL)
1487 (*(png_ptr->info_fn))(png_ptr, info_ptr);
1488}
1489
4946a942 1490void /* PRIVATE */
75b6e0a0
GD		 1491png_push_have_end(png_structp png_ptr, png_infop info_ptr)
1492{
1493 if (png_ptr->end_fn != NULL)
1494 (*(png_ptr->end_fn))(png_ptr, info_ptr);
1495}
1496
4946a942 1497void /* PRIVATE */
75b6e0a0
GD		 1498png_push_have_row(png_structp png_ptr, png_bytep row)
1499{
1500 if (png_ptr->row_fn != NULL)
1501 (*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number,
1502 (int)png_ptr->pass);
1503}
1504
4946a942 1505void PNGAPI
75b6e0a0
GD		 1506png_progressive_combine_row (png_structp png_ptr,
1507 png_bytep old_row, png_bytep new_row)
1508{
4946a942
GD		 1509#ifdef PNG_USE_LOCAL_ARRAYS
1510 const int FARDATA png_pass_dsp_mask[7] =
1511 {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
1512#endif
75b6e0a0
GD		 1513 if (new_row != NULL) /* new_row must == png_ptr->row_buf here. */
1514 png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]);
1515}
1516
4946a942 1517void PNGAPI
75b6e0a0
GD		 1518png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
1519 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
1520 png_progressive_end_ptr end_fn)
1521{
1522 png_ptr->info_fn = info_fn;
1523 png_ptr->row_fn = row_fn;
1524 png_ptr->end_fn = end_fn;
1525
1526 png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer);
1527}
1528
4946a942 1529png_voidp PNGAPI
75b6e0a0
GD		 1530png_get_progressive_ptr(png_structp png_ptr)
1531{
1532 return png_ptr->io_ptr;
1533}
75b6e0a0 1534#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
wxWidgets (Impactor)