Commit | Line | Data |
---|---|---|
0272a10d VZ |
1 | |
2 | /* pngpread.c - read a png file in push mode | |
3 | * | |
b61cc19c PC |
4 | * Last changed in libpng 1.4.3 [June 26, 2010] |
5 | * Copyright (c) 1998-2010 Glenn Randers-Pehrson | |
0272a10d VZ |
6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) | |
b61cc19c PC |
8 | * |
9 | * This code is released under the libpng license. | |
10 | * For conditions of distribution and use, see the disclaimer | |
11 | * and license in png.h | |
0272a10d VZ |
12 | */ |
13 | ||
b61cc19c | 14 | #define PNG_NO_PEDANTIC_WARNINGS |
0272a10d | 15 | #include "png.h" |
0272a10d | 16 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
b61cc19c | 17 | #include "pngpriv.h" |
0272a10d | 18 | |
b61cc19c | 19 | /* Push model modes */ |
0272a10d VZ |
20 | #define PNG_READ_SIG_MODE 0 |
21 | #define PNG_READ_CHUNK_MODE 1 | |
22 | #define PNG_READ_IDAT_MODE 2 | |
23 | #define PNG_SKIP_MODE 3 | |
24 | #define PNG_READ_tEXt_MODE 4 | |
25 | #define PNG_READ_zTXt_MODE 5 | |
26 | #define PNG_READ_DONE_MODE 6 | |
27 | #define PNG_READ_iTXt_MODE 7 | |
28 | #define PNG_ERROR_MODE 8 | |
29 | ||
30 | void PNGAPI | |
31 | png_process_data(png_structp png_ptr, png_infop info_ptr, | |
32 | png_bytep buffer, png_size_t buffer_size) | |
33 | { | |
b61cc19c PC |
34 | if (png_ptr == NULL || info_ptr == NULL) |
35 | return; | |
36 | ||
0272a10d VZ |
37 | png_push_restore_buffer(png_ptr, buffer, buffer_size); |
38 | ||
39 | while (png_ptr->buffer_size) | |
40 | { | |
41 | png_process_some_data(png_ptr, info_ptr); | |
42 | } | |
43 | } | |
44 | ||
45 | /* What we do with the incoming data depends on what we were previously | |
46 | * doing before we ran out of data... | |
47 | */ | |
48 | void /* PRIVATE */ | |
49 | png_process_some_data(png_structp png_ptr, png_infop info_ptr) | |
50 | { | |
b61cc19c PC |
51 | if (png_ptr == NULL) |
52 | return; | |
53 | ||
0272a10d VZ |
54 | switch (png_ptr->process_mode) |
55 | { | |
56 | case PNG_READ_SIG_MODE: | |
57 | { | |
58 | png_push_read_sig(png_ptr, info_ptr); | |
59 | break; | |
60 | } | |
b61cc19c | 61 | |
0272a10d VZ |
62 | case PNG_READ_CHUNK_MODE: |
63 | { | |
64 | png_push_read_chunk(png_ptr, info_ptr); | |
65 | break; | |
66 | } | |
b61cc19c | 67 | |
0272a10d VZ |
68 | case PNG_READ_IDAT_MODE: |
69 | { | |
70 | png_push_read_IDAT(png_ptr); | |
71 | break; | |
72 | } | |
b61cc19c PC |
73 | |
74 | #ifdef PNG_READ_tEXt_SUPPORTED | |
0272a10d VZ |
75 | case PNG_READ_tEXt_MODE: |
76 | { | |
77 | png_push_read_tEXt(png_ptr, info_ptr); | |
78 | break; | |
79 | } | |
b61cc19c | 80 | |
0272a10d | 81 | #endif |
b61cc19c | 82 | #ifdef PNG_READ_zTXt_SUPPORTED |
0272a10d VZ |
83 | case PNG_READ_zTXt_MODE: |
84 | { | |
85 | png_push_read_zTXt(png_ptr, info_ptr); | |
86 | break; | |
87 | } | |
b61cc19c | 88 | |
0272a10d | 89 | #endif |
b61cc19c | 90 | #ifdef PNG_READ_iTXt_SUPPORTED |
0272a10d VZ |
91 | case PNG_READ_iTXt_MODE: |
92 | { | |
93 | png_push_read_iTXt(png_ptr, info_ptr); | |
94 | break; | |
95 | } | |
b61cc19c | 96 | |
0272a10d VZ |
97 | #endif |
98 | case PNG_SKIP_MODE: | |
99 | { | |
100 | png_push_crc_finish(png_ptr); | |
101 | break; | |
102 | } | |
b61cc19c | 103 | |
0272a10d VZ |
104 | default: |
105 | { | |
106 | png_ptr->buffer_size = 0; | |
107 | break; | |
108 | } | |
109 | } | |
110 | } | |
111 | ||
112 | /* Read any remaining signature bytes from the stream and compare them with | |
113 | * the correct PNG signature. It is possible that this routine is called | |
114 | * with bytes already read from the signature, either because they have been | |
115 | * checked by the calling application, or because of multiple calls to this | |
116 | * routine. | |
117 | */ | |
118 | void /* PRIVATE */ | |
119 | png_push_read_sig(png_structp png_ptr, png_infop info_ptr) | |
120 | { | |
121 | png_size_t num_checked = png_ptr->sig_bytes, | |
122 | num_to_check = 8 - num_checked; | |
123 | ||
124 | if (png_ptr->buffer_size < num_to_check) | |
125 | { | |
126 | num_to_check = png_ptr->buffer_size; | |
127 | } | |
128 | ||
129 | png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]), | |
130 | num_to_check); | |
970f6abe | 131 | png_ptr->sig_bytes = (png_byte)(png_ptr->sig_bytes + num_to_check); |
0272a10d VZ |
132 | |
133 | if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check)) | |
134 | { | |
135 | if (num_checked < 4 && | |
136 | png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4)) | |
137 | png_error(png_ptr, "Not a PNG file"); | |
138 | else | |
139 | png_error(png_ptr, "PNG file corrupted by ASCII conversion"); | |
140 | } | |
141 | else | |
142 | { | |
143 | if (png_ptr->sig_bytes >= 8) | |
144 | { | |
145 | png_ptr->process_mode = PNG_READ_CHUNK_MODE; | |
146 | } | |
147 | } | |
148 | } | |
149 | ||
150 | void /* PRIVATE */ | |
151 | png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) | |
152 | { | |
b61cc19c PC |
153 | PNG_IHDR; |
154 | PNG_IDAT; | |
155 | PNG_IEND; | |
156 | PNG_PLTE; | |
157 | #ifdef PNG_READ_bKGD_SUPPORTED | |
158 | PNG_bKGD; | |
0272a10d | 159 | #endif |
b61cc19c PC |
160 | #ifdef PNG_READ_cHRM_SUPPORTED |
161 | PNG_cHRM; | |
0272a10d | 162 | #endif |
b61cc19c PC |
163 | #ifdef PNG_READ_gAMA_SUPPORTED |
164 | PNG_gAMA; | |
0272a10d | 165 | #endif |
b61cc19c PC |
166 | #ifdef PNG_READ_hIST_SUPPORTED |
167 | PNG_hIST; | |
0272a10d | 168 | #endif |
b61cc19c PC |
169 | #ifdef PNG_READ_iCCP_SUPPORTED |
170 | PNG_iCCP; | |
0272a10d | 171 | #endif |
b61cc19c PC |
172 | #ifdef PNG_READ_iTXt_SUPPORTED |
173 | PNG_iTXt; | |
0272a10d | 174 | #endif |
b61cc19c PC |
175 | #ifdef PNG_READ_oFFs_SUPPORTED |
176 | PNG_oFFs; | |
0272a10d | 177 | #endif |
b61cc19c PC |
178 | #ifdef PNG_READ_pCAL_SUPPORTED |
179 | PNG_pCAL; | |
0272a10d | 180 | #endif |
b61cc19c PC |
181 | #ifdef PNG_READ_pHYs_SUPPORTED |
182 | PNG_pHYs; | |
0272a10d | 183 | #endif |
b61cc19c PC |
184 | #ifdef PNG_READ_sBIT_SUPPORTED |
185 | PNG_sBIT; | |
0272a10d | 186 | #endif |
b61cc19c PC |
187 | #ifdef PNG_READ_sCAL_SUPPORTED |
188 | PNG_sCAL; | |
0272a10d | 189 | #endif |
b61cc19c PC |
190 | #ifdef PNG_READ_sRGB_SUPPORTED |
191 | PNG_sRGB; | |
0272a10d | 192 | #endif |
b61cc19c PC |
193 | #ifdef PNG_READ_sPLT_SUPPORTED |
194 | PNG_sPLT; | |
0272a10d | 195 | #endif |
b61cc19c PC |
196 | #ifdef PNG_READ_tEXt_SUPPORTED |
197 | PNG_tEXt; | |
0272a10d | 198 | #endif |
b61cc19c PC |
199 | #ifdef PNG_READ_tIME_SUPPORTED |
200 | PNG_tIME; | |
0272a10d | 201 | #endif |
b61cc19c PC |
202 | #ifdef PNG_READ_tRNS_SUPPORTED |
203 | PNG_tRNS; | |
0272a10d | 204 | #endif |
b61cc19c PC |
205 | #ifdef PNG_READ_zTXt_SUPPORTED |
206 | PNG_zTXt; | |
0272a10d | 207 | #endif |
b61cc19c | 208 | |
0272a10d VZ |
209 | /* First we make sure we have enough data for the 4 byte chunk name |
210 | * and the 4 byte chunk length before proceeding with decoding the | |
211 | * chunk data. To fully decode each of these chunks, we also make | |
212 | * sure we have enough data in the buffer for the 4 byte CRC at the | |
213 | * end of every chunk (except IDAT, which is handled separately). | |
214 | */ | |
215 | if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER)) | |
216 | { | |
217 | png_byte chunk_length[4]; | |
218 | ||
219 | if (png_ptr->buffer_size < 8) | |
220 | { | |
221 | png_push_save_buffer(png_ptr); | |
222 | return; | |
223 | } | |
224 | ||
225 | png_push_fill_buffer(png_ptr, chunk_length, 4); | |
970f6abe | 226 | png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length); |
0272a10d VZ |
227 | png_reset_crc(png_ptr); |
228 | png_crc_read(png_ptr, png_ptr->chunk_name, 4); | |
970f6abe | 229 | png_check_chunk_name(png_ptr, png_ptr->chunk_name); |
0272a10d VZ |
230 | png_ptr->mode |= PNG_HAVE_CHUNK_HEADER; |
231 | } | |
232 | ||
970f6abe VZ |
233 | if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
234 | if (png_ptr->mode & PNG_AFTER_IDAT) | |
0272a10d VZ |
235 | png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; |
236 | ||
237 | if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4)) | |
238 | { | |
970f6abe VZ |
239 | if (png_ptr->push_length != 13) |
240 | png_error(png_ptr, "Invalid IHDR length"); | |
b61cc19c | 241 | |
0272a10d VZ |
242 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
243 | { | |
244 | png_push_save_buffer(png_ptr); | |
245 | return; | |
246 | } | |
b61cc19c | 247 | |
0272a10d VZ |
248 | png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length); |
249 | } | |
b61cc19c | 250 | |
0272a10d VZ |
251 | else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) |
252 | { | |
253 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
254 | { | |
255 | png_push_save_buffer(png_ptr); | |
256 | return; | |
257 | } | |
b61cc19c | 258 | |
0272a10d VZ |
259 | png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length); |
260 | ||
261 | png_ptr->process_mode = PNG_READ_DONE_MODE; | |
262 | png_push_have_end(png_ptr, info_ptr); | |
263 | } | |
b61cc19c | 264 | |
0272a10d VZ |
265 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
266 | else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name)) | |
267 | { | |
268 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
269 | { | |
270 | png_push_save_buffer(png_ptr); | |
271 | return; | |
272 | } | |
b61cc19c | 273 | |
0272a10d VZ |
274 | if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
275 | png_ptr->mode |= PNG_HAVE_IDAT; | |
b61cc19c | 276 | |
0272a10d | 277 | png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length); |
b61cc19c | 278 | |
0272a10d VZ |
279 | if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
280 | png_ptr->mode |= PNG_HAVE_PLTE; | |
b61cc19c | 281 | |
0272a10d VZ |
282 | else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
283 | { | |
284 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) | |
285 | png_error(png_ptr, "Missing IHDR before IDAT"); | |
b61cc19c | 286 | |
0272a10d VZ |
287 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
288 | !(png_ptr->mode & PNG_HAVE_PLTE)) | |
289 | png_error(png_ptr, "Missing PLTE before IDAT"); | |
290 | } | |
291 | } | |
b61cc19c | 292 | |
0272a10d VZ |
293 | #endif |
294 | else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) | |
295 | { | |
296 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
297 | { | |
298 | png_push_save_buffer(png_ptr); | |
299 | return; | |
300 | } | |
301 | png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length); | |
302 | } | |
b61cc19c | 303 | |
970f6abe | 304 | else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
0272a10d VZ |
305 | { |
306 | /* If we reach an IDAT chunk, this means we have read all of the | |
307 | * header chunks, and we can start reading the image (or if this | |
308 | * is called after the image has been read - we have an error). | |
309 | */ | |
b61cc19c PC |
310 | |
311 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) | |
312 | png_error(png_ptr, "Missing IHDR before IDAT"); | |
313 | ||
314 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && | |
315 | !(png_ptr->mode & PNG_HAVE_PLTE)) | |
316 | png_error(png_ptr, "Missing PLTE before IDAT"); | |
0272a10d VZ |
317 | |
318 | if (png_ptr->mode & PNG_HAVE_IDAT) | |
319 | { | |
320 | if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) | |
b61cc19c PC |
321 | if (png_ptr->push_length == 0) |
322 | return; | |
0272a10d VZ |
323 | |
324 | if (png_ptr->mode & PNG_AFTER_IDAT) | |
b61cc19c | 325 | png_benign_error(png_ptr, "Too many IDATs found"); |
0272a10d VZ |
326 | } |
327 | ||
328 | png_ptr->idat_size = png_ptr->push_length; | |
329 | png_ptr->mode |= PNG_HAVE_IDAT; | |
330 | png_ptr->process_mode = PNG_READ_IDAT_MODE; | |
331 | png_push_have_info(png_ptr, info_ptr); | |
b61cc19c PC |
332 | png_ptr->zstream.avail_out = |
333 | (uInt) PNG_ROWBYTES(png_ptr->pixel_depth, | |
334 | png_ptr->iwidth) + 1; | |
0272a10d VZ |
335 | png_ptr->zstream.next_out = png_ptr->row_buf; |
336 | return; | |
337 | } | |
b61cc19c PC |
338 | |
339 | #ifdef PNG_READ_gAMA_SUPPORTED | |
0272a10d VZ |
340 | else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4)) |
341 | { | |
342 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
343 | { | |
344 | png_push_save_buffer(png_ptr); | |
345 | return; | |
346 | } | |
b61cc19c | 347 | |
0272a10d VZ |
348 | png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length); |
349 | } | |
b61cc19c | 350 | |
0272a10d | 351 | #endif |
b61cc19c | 352 | #ifdef PNG_READ_sBIT_SUPPORTED |
0272a10d VZ |
353 | else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4)) |
354 | { | |
355 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
356 | { | |
357 | png_push_save_buffer(png_ptr); | |
358 | return; | |
359 | } | |
b61cc19c | 360 | |
0272a10d VZ |
361 | png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length); |
362 | } | |
b61cc19c | 363 | |
0272a10d | 364 | #endif |
b61cc19c | 365 | #ifdef PNG_READ_cHRM_SUPPORTED |
0272a10d VZ |
366 | else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4)) |
367 | { | |
368 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
369 | { | |
370 | png_push_save_buffer(png_ptr); | |
371 | return; | |
372 | } | |
b61cc19c | 373 | |
0272a10d VZ |
374 | png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length); |
375 | } | |
b61cc19c | 376 | |
0272a10d | 377 | #endif |
b61cc19c | 378 | #ifdef PNG_READ_sRGB_SUPPORTED |
0272a10d VZ |
379 | else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4)) |
380 | { | |
381 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
382 | { | |
383 | png_push_save_buffer(png_ptr); | |
384 | return; | |
385 | } | |
b61cc19c | 386 | |
0272a10d VZ |
387 | png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length); |
388 | } | |
b61cc19c | 389 | |
0272a10d | 390 | #endif |
b61cc19c | 391 | #ifdef PNG_READ_iCCP_SUPPORTED |
0272a10d VZ |
392 | else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4)) |
393 | { | |
394 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
395 | { | |
396 | png_push_save_buffer(png_ptr); | |
397 | return; | |
398 | } | |
b61cc19c | 399 | |
0272a10d VZ |
400 | png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length); |
401 | } | |
b61cc19c | 402 | |
0272a10d | 403 | #endif |
b61cc19c | 404 | #ifdef PNG_READ_sPLT_SUPPORTED |
0272a10d VZ |
405 | else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4)) |
406 | { | |
407 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
408 | { | |
409 | png_push_save_buffer(png_ptr); | |
410 | return; | |
411 | } | |
b61cc19c | 412 | |
0272a10d VZ |
413 | png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length); |
414 | } | |
b61cc19c | 415 | |
0272a10d | 416 | #endif |
b61cc19c | 417 | #ifdef PNG_READ_tRNS_SUPPORTED |
0272a10d VZ |
418 | else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4)) |
419 | { | |
420 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
421 | { | |
422 | png_push_save_buffer(png_ptr); | |
423 | return; | |
424 | } | |
b61cc19c | 425 | |
0272a10d VZ |
426 | png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length); |
427 | } | |
b61cc19c | 428 | |
0272a10d | 429 | #endif |
b61cc19c | 430 | #ifdef PNG_READ_bKGD_SUPPORTED |
0272a10d VZ |
431 | else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4)) |
432 | { | |
433 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
434 | { | |
435 | png_push_save_buffer(png_ptr); | |
436 | return; | |
437 | } | |
b61cc19c | 438 | |
0272a10d VZ |
439 | png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length); |
440 | } | |
b61cc19c | 441 | |
0272a10d | 442 | #endif |
b61cc19c | 443 | #ifdef PNG_READ_hIST_SUPPORTED |
0272a10d VZ |
444 | else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4)) |
445 | { | |
446 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
447 | { | |
448 | png_push_save_buffer(png_ptr); | |
449 | return; | |
450 | } | |
b61cc19c | 451 | |
0272a10d VZ |
452 | png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length); |
453 | } | |
b61cc19c | 454 | |
0272a10d | 455 | #endif |
b61cc19c | 456 | #ifdef PNG_READ_pHYs_SUPPORTED |
0272a10d VZ |
457 | else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) |
458 | { | |
459 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
460 | { | |
461 | png_push_save_buffer(png_ptr); | |
462 | return; | |
463 | } | |
b61cc19c | 464 | |
0272a10d VZ |
465 | png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length); |
466 | } | |
b61cc19c | 467 | |
0272a10d | 468 | #endif |
b61cc19c | 469 | #ifdef PNG_READ_oFFs_SUPPORTED |
0272a10d VZ |
470 | else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4)) |
471 | { | |
472 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
473 | { | |
474 | png_push_save_buffer(png_ptr); | |
475 | return; | |
476 | } | |
b61cc19c | 477 | |
0272a10d VZ |
478 | png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length); |
479 | } | |
480 | #endif | |
b61cc19c PC |
481 | |
482 | #ifdef PNG_READ_pCAL_SUPPORTED | |
0272a10d VZ |
483 | else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4)) |
484 | { | |
485 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
486 | { | |
487 | png_push_save_buffer(png_ptr); | |
488 | return; | |
489 | } | |
b61cc19c | 490 | |
0272a10d VZ |
491 | png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length); |
492 | } | |
b61cc19c | 493 | |
0272a10d | 494 | #endif |
b61cc19c | 495 | #ifdef PNG_READ_sCAL_SUPPORTED |
0272a10d VZ |
496 | else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4)) |
497 | { | |
498 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
499 | { | |
500 | png_push_save_buffer(png_ptr); | |
501 | return; | |
502 | } | |
b61cc19c | 503 | |
0272a10d VZ |
504 | png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length); |
505 | } | |
b61cc19c | 506 | |
0272a10d | 507 | #endif |
b61cc19c | 508 | #ifdef PNG_READ_tIME_SUPPORTED |
0272a10d VZ |
509 | else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4)) |
510 | { | |
511 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
512 | { | |
513 | png_push_save_buffer(png_ptr); | |
514 | return; | |
515 | } | |
b61cc19c | 516 | |
0272a10d VZ |
517 | png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length); |
518 | } | |
b61cc19c | 519 | |
0272a10d | 520 | #endif |
b61cc19c | 521 | #ifdef PNG_READ_tEXt_SUPPORTED |
0272a10d VZ |
522 | else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) |
523 | { | |
524 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
525 | { | |
526 | png_push_save_buffer(png_ptr); | |
527 | return; | |
528 | } | |
b61cc19c | 529 | |
0272a10d VZ |
530 | png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length); |
531 | } | |
b61cc19c | 532 | |
0272a10d | 533 | #endif |
b61cc19c | 534 | #ifdef PNG_READ_zTXt_SUPPORTED |
0272a10d VZ |
535 | else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4)) |
536 | { | |
537 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
538 | { | |
539 | png_push_save_buffer(png_ptr); | |
540 | return; | |
541 | } | |
b61cc19c | 542 | |
0272a10d VZ |
543 | png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length); |
544 | } | |
b61cc19c | 545 | |
0272a10d | 546 | #endif |
b61cc19c | 547 | #ifdef PNG_READ_iTXt_SUPPORTED |
0272a10d VZ |
548 | else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4)) |
549 | { | |
550 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
551 | { | |
552 | png_push_save_buffer(png_ptr); | |
553 | return; | |
554 | } | |
b61cc19c | 555 | |
0272a10d VZ |
556 | png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length); |
557 | } | |
b61cc19c | 558 | |
0272a10d VZ |
559 | #endif |
560 | else | |
561 | { | |
562 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) | |
563 | { | |
564 | png_push_save_buffer(png_ptr); | |
565 | return; | |
566 | } | |
567 | png_push_handle_unknown(png_ptr, info_ptr, png_ptr->push_length); | |
568 | } | |
569 | ||
570 | png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; | |
571 | } | |
572 | ||
573 | void /* PRIVATE */ | |
574 | png_push_crc_skip(png_structp png_ptr, png_uint_32 skip) | |
575 | { | |
576 | png_ptr->process_mode = PNG_SKIP_MODE; | |
577 | png_ptr->skip_length = skip; | |
578 | } | |
579 | ||
580 | void /* PRIVATE */ | |
581 | png_push_crc_finish(png_structp png_ptr) | |
582 | { | |
583 | if (png_ptr->skip_length && png_ptr->save_buffer_size) | |
584 | { | |
585 | png_size_t save_size; | |
586 | ||
587 | if (png_ptr->skip_length < (png_uint_32)png_ptr->save_buffer_size) | |
588 | save_size = (png_size_t)png_ptr->skip_length; | |
589 | else | |
590 | save_size = png_ptr->save_buffer_size; | |
591 | ||
592 | png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size); | |
593 | ||
594 | png_ptr->skip_length -= save_size; | |
595 | png_ptr->buffer_size -= save_size; | |
596 | png_ptr->save_buffer_size -= save_size; | |
597 | png_ptr->save_buffer_ptr += save_size; | |
598 | } | |
599 | if (png_ptr->skip_length && png_ptr->current_buffer_size) | |
600 | { | |
601 | png_size_t save_size; | |
602 | ||
603 | if (png_ptr->skip_length < (png_uint_32)png_ptr->current_buffer_size) | |
604 | save_size = (png_size_t)png_ptr->skip_length; | |
605 | else | |
606 | save_size = png_ptr->current_buffer_size; | |
607 | ||
608 | png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size); | |
609 | ||
610 | png_ptr->skip_length -= save_size; | |
611 | png_ptr->buffer_size -= save_size; | |
612 | png_ptr->current_buffer_size -= save_size; | |
613 | png_ptr->current_buffer_ptr += save_size; | |
614 | } | |
615 | if (!png_ptr->skip_length) | |
616 | { | |
617 | if (png_ptr->buffer_size < 4) | |
618 | { | |
619 | png_push_save_buffer(png_ptr); | |
620 | return; | |
621 | } | |
622 | ||
623 | png_crc_finish(png_ptr, 0); | |
624 | png_ptr->process_mode = PNG_READ_CHUNK_MODE; | |
625 | } | |
626 | } | |
627 | ||
628 | void PNGAPI | |
629 | png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length) | |
630 | { | |
631 | png_bytep ptr; | |
632 | ||
b61cc19c PC |
633 | if (png_ptr == NULL) |
634 | return; | |
635 | ||
0272a10d VZ |
636 | ptr = buffer; |
637 | if (png_ptr->save_buffer_size) | |
638 | { | |
639 | png_size_t save_size; | |
640 | ||
641 | if (length < png_ptr->save_buffer_size) | |
642 | save_size = length; | |
643 | else | |
644 | save_size = png_ptr->save_buffer_size; | |
645 | ||
646 | png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size); | |
647 | length -= save_size; | |
648 | ptr += save_size; | |
649 | png_ptr->buffer_size -= save_size; | |
650 | png_ptr->save_buffer_size -= save_size; | |
651 | png_ptr->save_buffer_ptr += save_size; | |
652 | } | |
653 | if (length && png_ptr->current_buffer_size) | |
654 | { | |
655 | png_size_t save_size; | |
656 | ||
657 | if (length < png_ptr->current_buffer_size) | |
658 | save_size = length; | |
b61cc19c | 659 | |
0272a10d VZ |
660 | else |
661 | save_size = png_ptr->current_buffer_size; | |
662 | ||
663 | png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size); | |
664 | png_ptr->buffer_size -= save_size; | |
665 | png_ptr->current_buffer_size -= save_size; | |
666 | png_ptr->current_buffer_ptr += save_size; | |
667 | } | |
668 | } | |
669 | ||
670 | void /* PRIVATE */ | |
671 | png_push_save_buffer(png_structp png_ptr) | |
672 | { | |
673 | if (png_ptr->save_buffer_size) | |
674 | { | |
675 | if (png_ptr->save_buffer_ptr != png_ptr->save_buffer) | |
676 | { | |
970f6abe | 677 | png_size_t i, istop; |
0272a10d VZ |
678 | png_bytep sp; |
679 | png_bytep dp; | |
680 | ||
681 | istop = png_ptr->save_buffer_size; | |
682 | for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer; | |
683 | i < istop; i++, sp++, dp++) | |
684 | { | |
685 | *dp = *sp; | |
686 | } | |
687 | } | |
688 | } | |
689 | if (png_ptr->save_buffer_size + png_ptr->current_buffer_size > | |
690 | png_ptr->save_buffer_max) | |
691 | { | |
692 | png_size_t new_max; | |
693 | png_bytep old_buffer; | |
694 | ||
695 | if (png_ptr->save_buffer_size > PNG_SIZE_MAX - | |
696 | (png_ptr->current_buffer_size + 256)) | |
697 | { | |
698 | png_error(png_ptr, "Potential overflow of save_buffer"); | |
699 | } | |
b61cc19c | 700 | |
0272a10d VZ |
701 | new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256; |
702 | old_buffer = png_ptr->save_buffer; | |
b61cc19c PC |
703 | png_ptr->save_buffer = (png_bytep)png_malloc_warn(png_ptr, |
704 | (png_size_t)new_max); | |
705 | if (png_ptr->save_buffer == NULL) | |
706 | { | |
707 | png_free(png_ptr, old_buffer); | |
708 | png_error(png_ptr, "Insufficient memory for save_buffer"); | |
709 | } | |
0272a10d VZ |
710 | png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size); |
711 | png_free(png_ptr, old_buffer); | |
712 | png_ptr->save_buffer_max = new_max; | |
713 | } | |
714 | if (png_ptr->current_buffer_size) | |
715 | { | |
716 | png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size, | |
717 | png_ptr->current_buffer_ptr, png_ptr->current_buffer_size); | |
718 | png_ptr->save_buffer_size += png_ptr->current_buffer_size; | |
719 | png_ptr->current_buffer_size = 0; | |
720 | } | |
721 | png_ptr->save_buffer_ptr = png_ptr->save_buffer; | |
722 | png_ptr->buffer_size = 0; | |
723 | } | |
724 | ||
725 | void /* PRIVATE */ | |
726 | png_push_restore_buffer(png_structp png_ptr, png_bytep buffer, | |
727 | png_size_t buffer_length) | |
728 | { | |
729 | png_ptr->current_buffer = buffer; | |
730 | png_ptr->current_buffer_size = buffer_length; | |
731 | png_ptr->buffer_size = buffer_length + png_ptr->save_buffer_size; | |
732 | png_ptr->current_buffer_ptr = png_ptr->current_buffer; | |
733 | } | |
734 | ||
735 | void /* PRIVATE */ | |
736 | png_push_read_IDAT(png_structp png_ptr) | |
737 | { | |
b61cc19c | 738 | PNG_IDAT; |
0272a10d VZ |
739 | if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER)) |
740 | { | |
741 | png_byte chunk_length[4]; | |
742 | ||
743 | if (png_ptr->buffer_size < 8) | |
744 | { | |
745 | png_push_save_buffer(png_ptr); | |
746 | return; | |
747 | } | |
748 | ||
749 | png_push_fill_buffer(png_ptr, chunk_length, 4); | |
970f6abe | 750 | png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length); |
0272a10d VZ |
751 | png_reset_crc(png_ptr); |
752 | png_crc_read(png_ptr, png_ptr->chunk_name, 4); | |
753 | png_ptr->mode |= PNG_HAVE_CHUNK_HEADER; | |
754 | ||
970f6abe | 755 | if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
0272a10d VZ |
756 | { |
757 | png_ptr->process_mode = PNG_READ_CHUNK_MODE; | |
758 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) | |
759 | png_error(png_ptr, "Not enough compressed data"); | |
760 | return; | |
761 | } | |
762 | ||
763 | png_ptr->idat_size = png_ptr->push_length; | |
764 | } | |
765 | if (png_ptr->idat_size && png_ptr->save_buffer_size) | |
766 | { | |
767 | png_size_t save_size; | |
768 | ||
769 | if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size) | |
770 | { | |
771 | save_size = (png_size_t)png_ptr->idat_size; | |
b61cc19c PC |
772 | |
773 | /* Check for overflow */ | |
970f6abe | 774 | if ((png_uint_32)save_size != png_ptr->idat_size) |
0272a10d VZ |
775 | png_error(png_ptr, "save_size overflowed in pngpread"); |
776 | } | |
777 | else | |
778 | save_size = png_ptr->save_buffer_size; | |
779 | ||
780 | png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size); | |
b61cc19c PC |
781 | |
782 | png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size); | |
783 | ||
0272a10d VZ |
784 | png_ptr->idat_size -= save_size; |
785 | png_ptr->buffer_size -= save_size; | |
786 | png_ptr->save_buffer_size -= save_size; | |
787 | png_ptr->save_buffer_ptr += save_size; | |
788 | } | |
789 | if (png_ptr->idat_size && png_ptr->current_buffer_size) | |
790 | { | |
791 | png_size_t save_size; | |
792 | ||
793 | if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size) | |
794 | { | |
795 | save_size = (png_size_t)png_ptr->idat_size; | |
b61cc19c PC |
796 | |
797 | /* Check for overflow */ | |
970f6abe | 798 | if ((png_uint_32)save_size != png_ptr->idat_size) |
0272a10d VZ |
799 | png_error(png_ptr, "save_size overflowed in pngpread"); |
800 | } | |
801 | else | |
802 | save_size = png_ptr->current_buffer_size; | |
803 | ||
804 | png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size); | |
b61cc19c PC |
805 | |
806 | png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size); | |
0272a10d VZ |
807 | |
808 | png_ptr->idat_size -= save_size; | |
809 | png_ptr->buffer_size -= save_size; | |
810 | png_ptr->current_buffer_size -= save_size; | |
811 | png_ptr->current_buffer_ptr += save_size; | |
812 | } | |
813 | if (!png_ptr->idat_size) | |
814 | { | |
815 | if (png_ptr->buffer_size < 4) | |
816 | { | |
817 | png_push_save_buffer(png_ptr); | |
818 | return; | |
819 | } | |
820 | ||
821 | png_crc_finish(png_ptr, 0); | |
822 | png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; | |
823 | png_ptr->mode |= PNG_AFTER_IDAT; | |
824 | } | |
825 | } | |
826 | ||
827 | void /* PRIVATE */ | |
828 | png_process_IDAT_data(png_structp png_ptr, png_bytep buffer, | |
829 | png_size_t buffer_length) | |
830 | { | |
b61cc19c PC |
831 | /* The caller checks for a non-zero buffer length. */ |
832 | if (!(buffer_length > 0) || buffer == NULL) | |
833 | png_error(png_ptr, "No IDAT data (internal error)"); | |
0272a10d | 834 | |
b61cc19c PC |
835 | /* This routine must process all the data it has been given |
836 | * before returning, calling the row callback as required to | |
837 | * handle the uncompressed results. | |
838 | */ | |
0272a10d VZ |
839 | png_ptr->zstream.next_in = buffer; |
840 | png_ptr->zstream.avail_in = (uInt)buffer_length; | |
b61cc19c PC |
841 | |
842 | /* Keep going until the decompressed data is all processed | |
843 | * or the stream marked as finished. | |
844 | */ | |
845 | while (png_ptr->zstream.avail_in > 0 && | |
846 | !(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) | |
0272a10d | 847 | { |
b61cc19c PC |
848 | int ret; |
849 | ||
850 | /* We have data for zlib, but we must check that zlib | |
851 | * has somewhere to put the results. It doesn't matter | |
852 | * if we don't expect any results -- it may be the input | |
853 | * data is just the LZ end code. | |
854 | */ | |
855 | if (!(png_ptr->zstream.avail_out > 0)) | |
0272a10d | 856 | { |
b61cc19c PC |
857 | png_ptr->zstream.avail_out = |
858 | (uInt) PNG_ROWBYTES(png_ptr->pixel_depth, | |
859 | png_ptr->iwidth) + 1; | |
860 | png_ptr->zstream.next_out = png_ptr->row_buf; | |
861 | } | |
0272a10d | 862 | |
b61cc19c PC |
863 | /* Using Z_SYNC_FLUSH here means that an unterminated |
864 | * LZ stream can still be handled (a stream with a missing | |
865 | * end code), otherwise (Z_NO_FLUSH) a future zlib | |
866 | * implementation might defer output and, therefore, | |
867 | * change the current behavior. (See comments in inflate.c | |
868 | * for why this doesn't happen at present with zlib 1.2.5.) | |
869 | */ | |
870 | ret = inflate(&png_ptr->zstream, Z_SYNC_FLUSH); | |
871 | ||
872 | /* Check for any failure before proceeding. */ | |
873 | if (ret != Z_OK && ret != Z_STREAM_END) | |
874 | { | |
875 | /* Terminate the decompression. */ | |
876 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; | |
877 | ||
878 | /* This may be a truncated stream (missing or | |
879 | * damaged end code). Treat that as a warning. | |
880 | */ | |
881 | if (png_ptr->row_number >= png_ptr->num_rows || | |
882 | png_ptr->pass > 6) | |
883 | png_warning(png_ptr, "Truncated compressed data in IDAT"); | |
0272a10d | 884 | else |
b61cc19c PC |
885 | png_error(png_ptr, "Decompression error in IDAT"); |
886 | ||
887 | /* Skip the check on unprocessed input */ | |
888 | return; | |
0272a10d | 889 | } |
b61cc19c PC |
890 | |
891 | /* Did inflate output any data? */ | |
892 | if (png_ptr->zstream.next_out != png_ptr->row_buf) | |
0272a10d | 893 | { |
b61cc19c PC |
894 | /* Is this unexpected data after the last row? |
895 | * If it is, artificially terminate the LZ output | |
896 | * here. | |
897 | */ | |
898 | if (png_ptr->row_number >= png_ptr->num_rows || | |
899 | png_ptr->pass > 6) | |
0272a10d | 900 | { |
b61cc19c PC |
901 | /* Extra data. */ |
902 | png_warning(png_ptr, "Extra compressed data in IDAT"); | |
903 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; | |
904 | /* Do no more processing; skip the unprocessed | |
905 | * input check below. | |
906 | */ | |
907 | return; | |
0272a10d | 908 | } |
b61cc19c PC |
909 | |
910 | /* Do we have a complete row? */ | |
911 | if (png_ptr->zstream.avail_out == 0) | |
912 | png_push_process_row(png_ptr); | |
0272a10d | 913 | } |
b61cc19c PC |
914 | |
915 | /* And check for the end of the stream. */ | |
916 | if (ret == Z_STREAM_END) | |
917 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; | |
0272a10d | 918 | } |
b61cc19c PC |
919 | |
920 | /* All the data should have been processed, if anything | |
921 | * is left at this point we have bytes of IDAT data | |
922 | * after the zlib end code. | |
923 | */ | |
924 | if (png_ptr->zstream.avail_in > 0) | |
925 | png_warning(png_ptr, "Extra compression data"); | |
0272a10d VZ |
926 | } |
927 | ||
928 | void /* PRIVATE */ | |
929 | png_push_process_row(png_structp png_ptr) | |
930 | { | |
931 | png_ptr->row_info.color_type = png_ptr->color_type; | |
932 | png_ptr->row_info.width = png_ptr->iwidth; | |
933 | png_ptr->row_info.channels = png_ptr->channels; | |
934 | png_ptr->row_info.bit_depth = png_ptr->bit_depth; | |
935 | png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; | |
936 | ||
937 | png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, | |
938 | png_ptr->row_info.width); | |
939 | ||
940 | png_read_filter_row(png_ptr, &(png_ptr->row_info), | |
b61cc19c PC |
941 | png_ptr->row_buf + 1, png_ptr->prev_row + 1, |
942 | (int)(png_ptr->row_buf[0])); | |
0272a10d | 943 | |
b61cc19c | 944 | png_memcpy(png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1); |
0272a10d VZ |
945 | |
946 | if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA)) | |
947 | png_do_read_transformations(png_ptr); | |
948 | ||
b61cc19c PC |
949 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
950 | /* Blow up interlaced rows to full size */ | |
0272a10d VZ |
951 | if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) |
952 | { | |
953 | if (png_ptr->pass < 6) | |
954 | /* old interface (pre-1.0.9): | |
955 | png_do_read_interlace(&(png_ptr->row_info), | |
b61cc19c | 956 | png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); |
0272a10d VZ |
957 | */ |
958 | png_do_read_interlace(png_ptr); | |
959 | ||
960 | switch (png_ptr->pass) | |
961 | { | |
962 | case 0: | |
963 | { | |
964 | int i; | |
965 | for (i = 0; i < 8 && png_ptr->pass == 0; i++) | |
966 | { | |
967 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); | |
b61cc19c | 968 | png_read_push_finish_row(png_ptr); /* Updates png_ptr->pass */ |
0272a10d | 969 | } |
b61cc19c PC |
970 | |
971 | if (png_ptr->pass == 2) /* Pass 1 might be empty */ | |
0272a10d VZ |
972 | { |
973 | for (i = 0; i < 4 && png_ptr->pass == 2; i++) | |
974 | { | |
b61cc19c | 975 | png_push_have_row(png_ptr, NULL); |
0272a10d VZ |
976 | png_read_push_finish_row(png_ptr); |
977 | } | |
978 | } | |
b61cc19c | 979 | |
0272a10d VZ |
980 | if (png_ptr->pass == 4 && png_ptr->height <= 4) |
981 | { | |
982 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) | |
983 | { | |
b61cc19c | 984 | png_push_have_row(png_ptr, NULL); |
0272a10d VZ |
985 | png_read_push_finish_row(png_ptr); |
986 | } | |
987 | } | |
b61cc19c | 988 | |
0272a10d VZ |
989 | if (png_ptr->pass == 6 && png_ptr->height <= 4) |
990 | { | |
b61cc19c | 991 | png_push_have_row(png_ptr, NULL); |
0272a10d VZ |
992 | png_read_push_finish_row(png_ptr); |
993 | } | |
b61cc19c | 994 | |
0272a10d VZ |
995 | break; |
996 | } | |
b61cc19c | 997 | |
0272a10d VZ |
998 | case 1: |
999 | { | |
1000 | int i; | |
1001 | for (i = 0; i < 8 && png_ptr->pass == 1; i++) | |
1002 | { | |
1003 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); | |
1004 | png_read_push_finish_row(png_ptr); | |
1005 | } | |
b61cc19c PC |
1006 | |
1007 | if (png_ptr->pass == 2) /* Skip top 4 generated rows */ | |
0272a10d VZ |
1008 | { |
1009 | for (i = 0; i < 4 && png_ptr->pass == 2; i++) | |
1010 | { | |
b61cc19c | 1011 | png_push_have_row(png_ptr, NULL); |
0272a10d VZ |
1012 | png_read_push_finish_row(png_ptr); |
1013 | } | |
1014 | } | |
b61cc19c | 1015 | |
0272a10d VZ |
1016 | break; |
1017 | } | |
b61cc19c | 1018 | |
0272a10d VZ |
1019 | case 2: |
1020 | { | |
1021 | int i; | |
b61cc19c | 1022 | |
0272a10d VZ |
1023 | for (i = 0; i < 4 && png_ptr->pass == 2; i++) |
1024 | { | |
1025 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); | |
1026 | png_read_push_finish_row(png_ptr); | |
1027 | } | |
b61cc19c | 1028 | |
0272a10d VZ |
1029 | for (i = 0; i < 4 && png_ptr->pass == 2; i++) |
1030 | { | |
b61cc19c | 1031 | png_push_have_row(png_ptr, NULL); |
0272a10d VZ |
1032 | png_read_push_finish_row(png_ptr); |
1033 | } | |
b61cc19c PC |
1034 | |
1035 | if (png_ptr->pass == 4) /* Pass 3 might be empty */ | |
0272a10d VZ |
1036 | { |
1037 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) | |
1038 | { | |
b61cc19c | 1039 | png_push_have_row(png_ptr, NULL); |
0272a10d VZ |
1040 | png_read_push_finish_row(png_ptr); |
1041 | } | |
1042 | } | |
b61cc19c | 1043 | |
0272a10d VZ |
1044 | break; |
1045 | } | |
b61cc19c | 1046 | |
0272a10d VZ |
1047 | case 3: |
1048 | { | |
1049 | int i; | |
b61cc19c | 1050 | |
0272a10d VZ |
1051 | for (i = 0; i < 4 && png_ptr->pass == 3; i++) |
1052 | { | |
1053 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); | |
1054 | png_read_push_finish_row(png_ptr); | |
1055 | } | |
b61cc19c PC |
1056 | |
1057 | if (png_ptr->pass == 4) /* Skip top two generated rows */ | |
0272a10d VZ |
1058 | { |
1059 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) | |
1060 | { | |
b61cc19c | 1061 | png_push_have_row(png_ptr, NULL); |
0272a10d VZ |
1062 | png_read_push_finish_row(png_ptr); |
1063 | } | |
1064 | } | |
b61cc19c | 1065 | |
0272a10d VZ |
1066 | break; |
1067 | } | |
b61cc19c | 1068 | |
0272a10d VZ |
1069 | case 4: |
1070 | { | |
1071 | int i; | |
b61cc19c | 1072 | |
0272a10d VZ |
1073 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
1074 | { | |
1075 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); | |
1076 | png_read_push_finish_row(png_ptr); | |
1077 | } | |
b61cc19c | 1078 | |
0272a10d VZ |
1079 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
1080 | { | |
b61cc19c | 1081 | png_push_have_row(png_ptr, NULL); |
0272a10d VZ |
1082 | png_read_push_finish_row(png_ptr); |
1083 | } | |
b61cc19c PC |
1084 | |
1085 | if (png_ptr->pass == 6) /* Pass 5 might be empty */ | |
0272a10d | 1086 | { |
b61cc19c | 1087 | png_push_have_row(png_ptr, NULL); |
0272a10d VZ |
1088 | png_read_push_finish_row(png_ptr); |
1089 | } | |
b61cc19c | 1090 | |
0272a10d VZ |
1091 | break; |
1092 | } | |
b61cc19c | 1093 | |
0272a10d VZ |
1094 | case 5: |
1095 | { | |
1096 | int i; | |
b61cc19c | 1097 | |
0272a10d VZ |
1098 | for (i = 0; i < 2 && png_ptr->pass == 5; i++) |
1099 | { | |
1100 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); | |
1101 | png_read_push_finish_row(png_ptr); | |
1102 | } | |
b61cc19c PC |
1103 | |
1104 | if (png_ptr->pass == 6) /* Skip top generated row */ | |
0272a10d | 1105 | { |
b61cc19c | 1106 | png_push_have_row(png_ptr, NULL); |
0272a10d VZ |
1107 | png_read_push_finish_row(png_ptr); |
1108 | } | |
b61cc19c | 1109 | |
0272a10d VZ |
1110 | break; |
1111 | } | |
1112 | case 6: | |
1113 | { | |
1114 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); | |
1115 | png_read_push_finish_row(png_ptr); | |
b61cc19c | 1116 | |
0272a10d VZ |
1117 | if (png_ptr->pass != 6) |
1118 | break; | |
b61cc19c PC |
1119 | |
1120 | png_push_have_row(png_ptr, NULL); | |
0272a10d VZ |
1121 | png_read_push_finish_row(png_ptr); |
1122 | } | |
1123 | } | |
1124 | } | |
1125 | else | |
1126 | #endif | |
1127 | { | |
1128 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); | |
1129 | png_read_push_finish_row(png_ptr); | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | void /* PRIVATE */ | |
1134 | png_read_push_finish_row(png_structp png_ptr) | |
1135 | { | |
b61cc19c | 1136 | /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
0272a10d | 1137 | |
b61cc19c | 1138 | /* Start of interlace block */ |
0272a10d VZ |
1139 | PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; |
1140 | ||
b61cc19c | 1141 | /* Offset to next interlace block */ |
0272a10d VZ |
1142 | PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; |
1143 | ||
b61cc19c | 1144 | /* Start of interlace block in the y direction */ |
0272a10d VZ |
1145 | PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1}; |
1146 | ||
b61cc19c | 1147 | /* Offset to next interlace block in the y direction */ |
0272a10d VZ |
1148 | PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2}; |
1149 | ||
1150 | /* Height of interlace block. This is not currently used - if you need | |
1151 | * it, uncomment it here and in png.h | |
1152 | PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1}; | |
1153 | */ | |
0272a10d VZ |
1154 | |
1155 | png_ptr->row_number++; | |
1156 | if (png_ptr->row_number < png_ptr->num_rows) | |
1157 | return; | |
1158 | ||
b61cc19c | 1159 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
0272a10d VZ |
1160 | if (png_ptr->interlaced) |
1161 | { | |
1162 | png_ptr->row_number = 0; | |
b61cc19c | 1163 | png_memset(png_ptr->prev_row, 0, |
0272a10d VZ |
1164 | png_ptr->rowbytes + 1); |
1165 | do | |
1166 | { | |
1167 | png_ptr->pass++; | |
1168 | if ((png_ptr->pass == 1 && png_ptr->width < 5) || | |
1169 | (png_ptr->pass == 3 && png_ptr->width < 3) || | |
1170 | (png_ptr->pass == 5 && png_ptr->width < 2)) | |
1171 | png_ptr->pass++; | |
1172 | ||
1173 | if (png_ptr->pass > 7) | |
1174 | png_ptr->pass--; | |
b61cc19c | 1175 | |
0272a10d VZ |
1176 | if (png_ptr->pass >= 7) |
1177 | break; | |
1178 | ||
1179 | png_ptr->iwidth = (png_ptr->width + | |
1180 | png_pass_inc[png_ptr->pass] - 1 - | |
1181 | png_pass_start[png_ptr->pass]) / | |
1182 | png_pass_inc[png_ptr->pass]; | |
1183 | ||
0272a10d VZ |
1184 | if (png_ptr->transformations & PNG_INTERLACE) |
1185 | break; | |
1186 | ||
1187 | png_ptr->num_rows = (png_ptr->height + | |
1188 | png_pass_yinc[png_ptr->pass] - 1 - | |
1189 | png_pass_ystart[png_ptr->pass]) / | |
1190 | png_pass_yinc[png_ptr->pass]; | |
1191 | ||
1192 | } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0); | |
1193 | } | |
b61cc19c | 1194 | #endif /* PNG_READ_INTERLACING_SUPPORTED */ |
0272a10d VZ |
1195 | } |
1196 | ||
b61cc19c | 1197 | #ifdef PNG_READ_tEXt_SUPPORTED |
0272a10d VZ |
1198 | void /* PRIVATE */ |
1199 | png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 | |
1200 | length) | |
1201 | { | |
1202 | if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) | |
1203 | { | |
1204 | png_error(png_ptr, "Out of place tEXt"); | |
b61cc19c | 1205 | info_ptr = info_ptr; /* To quiet some compiler warnings */ |
0272a10d VZ |
1206 | } |
1207 | ||
1208 | #ifdef PNG_MAX_MALLOC_64K | |
1209 | png_ptr->skip_length = 0; /* This may not be necessary */ | |
1210 | ||
1211 | if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */ | |
1212 | { | |
1213 | png_warning(png_ptr, "tEXt chunk too large to fit in memory"); | |
1214 | png_ptr->skip_length = length - (png_uint_32)65535L; | |
1215 | length = (png_uint_32)65535L; | |
1216 | } | |
1217 | #endif | |
1218 | ||
1219 | png_ptr->current_text = (png_charp)png_malloc(png_ptr, | |
b61cc19c | 1220 | (png_size_t)(length + 1)); |
0272a10d VZ |
1221 | png_ptr->current_text[length] = '\0'; |
1222 | png_ptr->current_text_ptr = png_ptr->current_text; | |
1223 | png_ptr->current_text_size = (png_size_t)length; | |
1224 | png_ptr->current_text_left = (png_size_t)length; | |
1225 | png_ptr->process_mode = PNG_READ_tEXt_MODE; | |
1226 | } | |
1227 | ||
1228 | void /* PRIVATE */ | |
1229 | png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr) | |
1230 | { | |
1231 | if (png_ptr->buffer_size && png_ptr->current_text_left) | |
1232 | { | |
1233 | png_size_t text_size; | |
1234 | ||
1235 | if (png_ptr->buffer_size < png_ptr->current_text_left) | |
1236 | text_size = png_ptr->buffer_size; | |
b61cc19c | 1237 | |
0272a10d VZ |
1238 | else |
1239 | text_size = png_ptr->current_text_left; | |
b61cc19c | 1240 | |
0272a10d VZ |
1241 | png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); |
1242 | png_ptr->current_text_left -= text_size; | |
1243 | png_ptr->current_text_ptr += text_size; | |
1244 | } | |
1245 | if (!(png_ptr->current_text_left)) | |
1246 | { | |
1247 | png_textp text_ptr; | |
1248 | png_charp text; | |
1249 | png_charp key; | |
1250 | int ret; | |
1251 | ||
1252 | if (png_ptr->buffer_size < 4) | |
1253 | { | |
1254 | png_push_save_buffer(png_ptr); | |
1255 | return; | |
1256 | } | |
1257 | ||
1258 | png_push_crc_finish(png_ptr); | |
1259 | ||
b61cc19c | 1260 | #ifdef PNG_MAX_MALLOC_64K |
0272a10d VZ |
1261 | if (png_ptr->skip_length) |
1262 | return; | |
1263 | #endif | |
1264 | ||
1265 | key = png_ptr->current_text; | |
1266 | ||
1267 | for (text = key; *text; text++) | |
b61cc19c | 1268 | /* Empty loop */ ; |
0272a10d | 1269 | |
970f6abe | 1270 | if (text < key + png_ptr->current_text_size) |
0272a10d VZ |
1271 | text++; |
1272 | ||
1273 | text_ptr = (png_textp)png_malloc(png_ptr, | |
b61cc19c | 1274 | png_sizeof(png_text)); |
0272a10d VZ |
1275 | text_ptr->compression = PNG_TEXT_COMPRESSION_NONE; |
1276 | text_ptr->key = key; | |
1277 | #ifdef PNG_iTXt_SUPPORTED | |
1278 | text_ptr->lang = NULL; | |
1279 | text_ptr->lang_key = NULL; | |
1280 | #endif | |
1281 | text_ptr->text = text; | |
1282 | ||
1283 | ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); | |
1284 | ||
1285 | png_free(png_ptr, key); | |
1286 | png_free(png_ptr, text_ptr); | |
1287 | png_ptr->current_text = NULL; | |
1288 | ||
1289 | if (ret) | |
b61cc19c | 1290 | png_warning(png_ptr, "Insufficient memory to store text chunk"); |
0272a10d VZ |
1291 | } |
1292 | } | |
1293 | #endif | |
1294 | ||
b61cc19c | 1295 | #ifdef PNG_READ_zTXt_SUPPORTED |
0272a10d VZ |
1296 | void /* PRIVATE */ |
1297 | png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 | |
1298 | length) | |
1299 | { | |
1300 | if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) | |
1301 | { | |
1302 | png_error(png_ptr, "Out of place zTXt"); | |
b61cc19c | 1303 | info_ptr = info_ptr; /* To quiet some compiler warnings */ |
0272a10d VZ |
1304 | } |
1305 | ||
1306 | #ifdef PNG_MAX_MALLOC_64K | |
1307 | /* We can't handle zTXt chunks > 64K, since we don't have enough space | |
1308 | * to be able to store the uncompressed data. Actually, the threshold | |
1309 | * is probably around 32K, but it isn't as definite as 64K is. | |
1310 | */ | |
1311 | if (length > (png_uint_32)65535L) | |
1312 | { | |
1313 | png_warning(png_ptr, "zTXt chunk too large to fit in memory"); | |
1314 | png_push_crc_skip(png_ptr, length); | |
1315 | return; | |
1316 | } | |
1317 | #endif | |
1318 | ||
1319 | png_ptr->current_text = (png_charp)png_malloc(png_ptr, | |
b61cc19c | 1320 | (png_size_t)(length + 1)); |
0272a10d VZ |
1321 | png_ptr->current_text[length] = '\0'; |
1322 | png_ptr->current_text_ptr = png_ptr->current_text; | |
1323 | png_ptr->current_text_size = (png_size_t)length; | |
1324 | png_ptr->current_text_left = (png_size_t)length; | |
1325 | png_ptr->process_mode = PNG_READ_zTXt_MODE; | |
1326 | } | |
1327 | ||
1328 | void /* PRIVATE */ | |
1329 | png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr) | |
1330 | { | |
1331 | if (png_ptr->buffer_size && png_ptr->current_text_left) | |
1332 | { | |
1333 | png_size_t text_size; | |
1334 | ||
1335 | if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left) | |
1336 | text_size = png_ptr->buffer_size; | |
b61cc19c | 1337 | |
0272a10d VZ |
1338 | else |
1339 | text_size = png_ptr->current_text_left; | |
b61cc19c | 1340 | |
0272a10d VZ |
1341 | png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); |
1342 | png_ptr->current_text_left -= text_size; | |
1343 | png_ptr->current_text_ptr += text_size; | |
1344 | } | |
1345 | if (!(png_ptr->current_text_left)) | |
1346 | { | |
1347 | png_textp text_ptr; | |
1348 | png_charp text; | |
1349 | png_charp key; | |
1350 | int ret; | |
1351 | png_size_t text_size, key_size; | |
1352 | ||
1353 | if (png_ptr->buffer_size < 4) | |
1354 | { | |
1355 | png_push_save_buffer(png_ptr); | |
1356 | return; | |
1357 | } | |
1358 | ||
1359 | png_push_crc_finish(png_ptr); | |
1360 | ||
1361 | key = png_ptr->current_text; | |
1362 | ||
1363 | for (text = key; *text; text++) | |
b61cc19c | 1364 | /* Empty loop */ ; |
0272a10d VZ |
1365 | |
1366 | /* zTXt can't have zero text */ | |
970f6abe | 1367 | if (text >= key + png_ptr->current_text_size) |
0272a10d VZ |
1368 | { |
1369 | png_ptr->current_text = NULL; | |
1370 | png_free(png_ptr, key); | |
1371 | return; | |
1372 | } | |
1373 | ||
1374 | text++; | |
1375 | ||
b61cc19c | 1376 | if (*text != PNG_TEXT_COMPRESSION_zTXt) /* Check compression byte */ |
0272a10d VZ |
1377 | { |
1378 | png_ptr->current_text = NULL; | |
1379 | png_free(png_ptr, key); | |
1380 | return; | |
1381 | } | |
1382 | ||
1383 | text++; | |
1384 | ||
1385 | png_ptr->zstream.next_in = (png_bytep )text; | |
1386 | png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size - | |
1387 | (text - key)); | |
1388 | png_ptr->zstream.next_out = png_ptr->zbuf; | |
1389 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; | |
1390 | ||
1391 | key_size = text - key; | |
1392 | text_size = 0; | |
1393 | text = NULL; | |
1394 | ret = Z_STREAM_END; | |
1395 | ||
1396 | while (png_ptr->zstream.avail_in) | |
1397 | { | |
1398 | ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); | |
1399 | if (ret != Z_OK && ret != Z_STREAM_END) | |
1400 | { | |
1401 | inflateReset(&png_ptr->zstream); | |
1402 | png_ptr->zstream.avail_in = 0; | |
1403 | png_ptr->current_text = NULL; | |
1404 | png_free(png_ptr, key); | |
1405 | png_free(png_ptr, text); | |
1406 | return; | |
1407 | } | |
1408 | if (!(png_ptr->zstream.avail_out) || ret == Z_STREAM_END) | |
1409 | { | |
1410 | if (text == NULL) | |
1411 | { | |
1412 | text = (png_charp)png_malloc(png_ptr, | |
b61cc19c | 1413 | (png_ptr->zbuf_size |
970f6abe | 1414 | - png_ptr->zstream.avail_out + key_size + 1)); |
b61cc19c | 1415 | |
0272a10d VZ |
1416 | png_memcpy(text + key_size, png_ptr->zbuf, |
1417 | png_ptr->zbuf_size - png_ptr->zstream.avail_out); | |
b61cc19c | 1418 | |
0272a10d | 1419 | png_memcpy(text, key, key_size); |
b61cc19c | 1420 | |
0272a10d VZ |
1421 | text_size = key_size + png_ptr->zbuf_size - |
1422 | png_ptr->zstream.avail_out; | |
b61cc19c | 1423 | |
0272a10d VZ |
1424 | *(text + text_size) = '\0'; |
1425 | } | |
1426 | else | |
1427 | { | |
1428 | png_charp tmp; | |
1429 | ||
1430 | tmp = text; | |
1431 | text = (png_charp)png_malloc(png_ptr, text_size + | |
b61cc19c | 1432 | (png_ptr->zbuf_size |
970f6abe | 1433 | - png_ptr->zstream.avail_out + 1)); |
b61cc19c | 1434 | |
0272a10d VZ |
1435 | png_memcpy(text, tmp, text_size); |
1436 | png_free(png_ptr, tmp); | |
b61cc19c | 1437 | |
0272a10d VZ |
1438 | png_memcpy(text + text_size, png_ptr->zbuf, |
1439 | png_ptr->zbuf_size - png_ptr->zstream.avail_out); | |
b61cc19c | 1440 | |
0272a10d VZ |
1441 | text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out; |
1442 | *(text + text_size) = '\0'; | |
1443 | } | |
1444 | if (ret != Z_STREAM_END) | |
1445 | { | |
1446 | png_ptr->zstream.next_out = png_ptr->zbuf; | |
1447 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; | |
1448 | } | |
1449 | } | |
1450 | else | |
1451 | { | |
1452 | break; | |
1453 | } | |
1454 | ||
1455 | if (ret == Z_STREAM_END) | |
1456 | break; | |
1457 | } | |
1458 | ||
1459 | inflateReset(&png_ptr->zstream); | |
1460 | png_ptr->zstream.avail_in = 0; | |
1461 | ||
1462 | if (ret != Z_STREAM_END) | |
1463 | { | |
1464 | png_ptr->current_text = NULL; | |
1465 | png_free(png_ptr, key); | |
1466 | png_free(png_ptr, text); | |
1467 | return; | |
1468 | } | |
1469 | ||
1470 | png_ptr->current_text = NULL; | |
1471 | png_free(png_ptr, key); | |
1472 | key = text; | |
1473 | text += key_size; | |
1474 | ||
1475 | text_ptr = (png_textp)png_malloc(png_ptr, | |
b61cc19c | 1476 | png_sizeof(png_text)); |
0272a10d VZ |
1477 | text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt; |
1478 | text_ptr->key = key; | |
1479 | #ifdef PNG_iTXt_SUPPORTED | |
1480 | text_ptr->lang = NULL; | |
1481 | text_ptr->lang_key = NULL; | |
1482 | #endif | |
1483 | text_ptr->text = text; | |
1484 | ||
1485 | ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); | |
1486 | ||
1487 | png_free(png_ptr, key); | |
1488 | png_free(png_ptr, text_ptr); | |
1489 | ||
1490 | if (ret) | |
b61cc19c | 1491 | png_warning(png_ptr, "Insufficient memory to store text chunk"); |
0272a10d VZ |
1492 | } |
1493 | } | |
1494 | #endif | |
1495 | ||
b61cc19c | 1496 | #ifdef PNG_READ_iTXt_SUPPORTED |
0272a10d VZ |
1497 | void /* PRIVATE */ |
1498 | png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 | |
1499 | length) | |
1500 | { | |
1501 | if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) | |
1502 | { | |
1503 | png_error(png_ptr, "Out of place iTXt"); | |
b61cc19c | 1504 | info_ptr = info_ptr; /* To quiet some compiler warnings */ |
0272a10d VZ |
1505 | } |
1506 | ||
1507 | #ifdef PNG_MAX_MALLOC_64K | |
1508 | png_ptr->skip_length = 0; /* This may not be necessary */ | |
1509 | ||
1510 | if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */ | |
1511 | { | |
1512 | png_warning(png_ptr, "iTXt chunk too large to fit in memory"); | |
1513 | png_ptr->skip_length = length - (png_uint_32)65535L; | |
1514 | length = (png_uint_32)65535L; | |
1515 | } | |
1516 | #endif | |
1517 | ||
1518 | png_ptr->current_text = (png_charp)png_malloc(png_ptr, | |
b61cc19c | 1519 | (png_size_t)(length + 1)); |
0272a10d VZ |
1520 | png_ptr->current_text[length] = '\0'; |
1521 | png_ptr->current_text_ptr = png_ptr->current_text; | |
1522 | png_ptr->current_text_size = (png_size_t)length; | |
1523 | png_ptr->current_text_left = (png_size_t)length; | |
1524 | png_ptr->process_mode = PNG_READ_iTXt_MODE; | |
1525 | } | |
1526 | ||
1527 | void /* PRIVATE */ | |
1528 | png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr) | |
1529 | { | |
1530 | ||
1531 | if (png_ptr->buffer_size && png_ptr->current_text_left) | |
1532 | { | |
1533 | png_size_t text_size; | |
1534 | ||
1535 | if (png_ptr->buffer_size < png_ptr->current_text_left) | |
1536 | text_size = png_ptr->buffer_size; | |
b61cc19c | 1537 | |
0272a10d VZ |
1538 | else |
1539 | text_size = png_ptr->current_text_left; | |
b61cc19c | 1540 | |
0272a10d VZ |
1541 | png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); |
1542 | png_ptr->current_text_left -= text_size; | |
1543 | png_ptr->current_text_ptr += text_size; | |
1544 | } | |
1545 | if (!(png_ptr->current_text_left)) | |
1546 | { | |
1547 | png_textp text_ptr; | |
1548 | png_charp key; | |
1549 | int comp_flag; | |
1550 | png_charp lang; | |
1551 | png_charp lang_key; | |
1552 | png_charp text; | |
1553 | int ret; | |
1554 | ||
1555 | if (png_ptr->buffer_size < 4) | |
1556 | { | |
1557 | png_push_save_buffer(png_ptr); | |
1558 | return; | |
1559 | } | |
1560 | ||
1561 | png_push_crc_finish(png_ptr); | |
1562 | ||
b61cc19c | 1563 | #ifdef PNG_MAX_MALLOC_64K |
0272a10d VZ |
1564 | if (png_ptr->skip_length) |
1565 | return; | |
1566 | #endif | |
1567 | ||
1568 | key = png_ptr->current_text; | |
1569 | ||
1570 | for (lang = key; *lang; lang++) | |
b61cc19c | 1571 | /* Empty loop */ ; |
0272a10d | 1572 | |
970f6abe | 1573 | if (lang < key + png_ptr->current_text_size - 3) |
0272a10d VZ |
1574 | lang++; |
1575 | ||
1576 | comp_flag = *lang++; | |
b61cc19c | 1577 | lang++; /* Skip comp_type, always zero */ |
0272a10d VZ |
1578 | |
1579 | for (lang_key = lang; *lang_key; lang_key++) | |
b61cc19c PC |
1580 | /* Empty loop */ ; |
1581 | ||
1582 | lang_key++; /* Skip NUL separator */ | |
0272a10d | 1583 | |
970f6abe | 1584 | text=lang_key; |
b61cc19c | 1585 | |
970f6abe VZ |
1586 | if (lang_key < key + png_ptr->current_text_size - 1) |
1587 | { | |
1588 | for (; *text; text++) | |
b61cc19c | 1589 | /* Empty loop */ ; |
970f6abe | 1590 | } |
0272a10d | 1591 | |
970f6abe | 1592 | if (text < key + png_ptr->current_text_size) |
0272a10d VZ |
1593 | text++; |
1594 | ||
1595 | text_ptr = (png_textp)png_malloc(png_ptr, | |
b61cc19c PC |
1596 | png_sizeof(png_text)); |
1597 | ||
0272a10d VZ |
1598 | text_ptr->compression = comp_flag + 2; |
1599 | text_ptr->key = key; | |
1600 | text_ptr->lang = lang; | |
1601 | text_ptr->lang_key = lang_key; | |
1602 | text_ptr->text = text; | |
1603 | text_ptr->text_length = 0; | |
1604 | text_ptr->itxt_length = png_strlen(text); | |
1605 | ||
1606 | ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); | |
1607 | ||
1608 | png_ptr->current_text = NULL; | |
1609 | ||
1610 | png_free(png_ptr, text_ptr); | |
1611 | if (ret) | |
b61cc19c | 1612 | png_warning(png_ptr, "Insufficient memory to store iTXt chunk"); |
0272a10d VZ |
1613 | } |
1614 | } | |
1615 | #endif | |
1616 | ||
1617 | /* This function is called when we haven't found a handler for this | |
1618 | * chunk. If there isn't a problem with the chunk itself (ie a bad chunk | |
1619 | * name or a critical chunk), the chunk is (currently) silently ignored. | |
1620 | */ | |
1621 | void /* PRIVATE */ | |
1622 | png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 | |
1623 | length) | |
1624 | { | |
970f6abe | 1625 | png_uint_32 skip = 0; |
0272a10d VZ |
1626 | |
1627 | if (!(png_ptr->chunk_name[0] & 0x20)) | |
1628 | { | |
b61cc19c | 1629 | #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED |
970f6abe VZ |
1630 | if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != |
1631 | PNG_HANDLE_CHUNK_ALWAYS | |
b61cc19c | 1632 | #ifdef PNG_READ_USER_CHUNKS_SUPPORTED |
970f6abe | 1633 | && png_ptr->read_user_chunk_fn == NULL |
0272a10d | 1634 | #endif |
970f6abe | 1635 | ) |
0272a10d | 1636 | #endif |
970f6abe | 1637 | png_chunk_error(png_ptr, "unknown critical chunk"); |
0272a10d | 1638 | |
b61cc19c | 1639 | info_ptr = info_ptr; /* To quiet some compiler warnings */ |
0272a10d VZ |
1640 | } |
1641 | ||
b61cc19c | 1642 | #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED |
0272a10d VZ |
1643 | if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) |
1644 | { | |
1645 | #ifdef PNG_MAX_MALLOC_64K | |
1646 | if (length > (png_uint_32)65535L) | |
1647 | { | |
1648 | png_warning(png_ptr, "unknown chunk too large to fit in memory"); | |
1649 | skip = length - (png_uint_32)65535L; | |
1650 | length = (png_uint_32)65535L; | |
1651 | } | |
1652 | #endif | |
970f6abe | 1653 | png_memcpy((png_charp)png_ptr->unknown_chunk.name, |
b61cc19c | 1654 | (png_charp)png_ptr->chunk_name, |
970f6abe VZ |
1655 | png_sizeof(png_ptr->unknown_chunk.name)); |
1656 | png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name) - 1] | |
1657 | = '\0'; | |
1658 | ||
0272a10d | 1659 | png_ptr->unknown_chunk.size = (png_size_t)length; |
b61cc19c | 1660 | |
970f6abe VZ |
1661 | if (length == 0) |
1662 | png_ptr->unknown_chunk.data = NULL; | |
b61cc19c | 1663 | |
970f6abe VZ |
1664 | else |
1665 | { | |
1666 | png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, | |
b61cc19c | 1667 | (png_size_t)length); |
970f6abe VZ |
1668 | png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length); |
1669 | } | |
b61cc19c PC |
1670 | |
1671 | #ifdef PNG_READ_USER_CHUNKS_SUPPORTED | |
970f6abe | 1672 | if (png_ptr->read_user_chunk_fn != NULL) |
0272a10d | 1673 | { |
b61cc19c | 1674 | /* Callback to user unknown chunk handler */ |
0272a10d VZ |
1675 | int ret; |
1676 | ret = (*(png_ptr->read_user_chunk_fn)) | |
1677 | (png_ptr, &png_ptr->unknown_chunk); | |
b61cc19c | 1678 | |
0272a10d VZ |
1679 | if (ret < 0) |
1680 | png_chunk_error(png_ptr, "error in user chunk"); | |
b61cc19c | 1681 | |
0272a10d VZ |
1682 | if (ret == 0) |
1683 | { | |
1684 | if (!(png_ptr->chunk_name[0] & 0x20)) | |
970f6abe | 1685 | if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != |
0272a10d VZ |
1686 | PNG_HANDLE_CHUNK_ALWAYS) |
1687 | png_chunk_error(png_ptr, "unknown critical chunk"); | |
1688 | png_set_unknown_chunks(png_ptr, info_ptr, | |
1689 | &png_ptr->unknown_chunk, 1); | |
1690 | } | |
1691 | } | |
b61cc19c | 1692 | |
970f6abe | 1693 | else |
0272a10d | 1694 | #endif |
970f6abe | 1695 | png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1); |
0272a10d VZ |
1696 | png_free(png_ptr, png_ptr->unknown_chunk.data); |
1697 | png_ptr->unknown_chunk.data = NULL; | |
1698 | } | |
b61cc19c | 1699 | |
0272a10d VZ |
1700 | else |
1701 | #endif | |
1702 | skip=length; | |
1703 | png_push_crc_skip(png_ptr, skip); | |
1704 | } | |
1705 | ||
1706 | void /* PRIVATE */ | |
1707 | png_push_have_info(png_structp png_ptr, png_infop info_ptr) | |
1708 | { | |
1709 | if (png_ptr->info_fn != NULL) | |
1710 | (*(png_ptr->info_fn))(png_ptr, info_ptr); | |
1711 | } | |
1712 | ||
1713 | void /* PRIVATE */ | |
1714 | png_push_have_end(png_structp png_ptr, png_infop info_ptr) | |
1715 | { | |
1716 | if (png_ptr->end_fn != NULL) | |
1717 | (*(png_ptr->end_fn))(png_ptr, info_ptr); | |
1718 | } | |
1719 | ||
1720 | void /* PRIVATE */ | |
1721 | png_push_have_row(png_structp png_ptr, png_bytep row) | |
1722 | { | |
1723 | if (png_ptr->row_fn != NULL) | |
1724 | (*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number, | |
1725 | (int)png_ptr->pass); | |
1726 | } | |
1727 | ||
1728 | void PNGAPI | |
1729 | png_progressive_combine_row (png_structp png_ptr, | |
1730 | png_bytep old_row, png_bytep new_row) | |
1731 | { | |
0272a10d VZ |
1732 | PNG_CONST int FARDATA png_pass_dsp_mask[7] = |
1733 | {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; | |
b61cc19c PC |
1734 | |
1735 | if (png_ptr == NULL) | |
1736 | return; | |
1737 | ||
0272a10d VZ |
1738 | if (new_row != NULL) /* new_row must == png_ptr->row_buf here. */ |
1739 | png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]); | |
1740 | } | |
1741 | ||
1742 | void PNGAPI | |
1743 | png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr, | |
1744 | png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, | |
1745 | png_progressive_end_ptr end_fn) | |
1746 | { | |
b61cc19c PC |
1747 | if (png_ptr == NULL) |
1748 | return; | |
1749 | ||
0272a10d VZ |
1750 | png_ptr->info_fn = info_fn; |
1751 | png_ptr->row_fn = row_fn; | |
1752 | png_ptr->end_fn = end_fn; | |
1753 | ||
1754 | png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer); | |
1755 | } | |
1756 | ||
1757 | png_voidp PNGAPI | |
1758 | png_get_progressive_ptr(png_structp png_ptr) | |
1759 | { | |
b61cc19c PC |
1760 | if (png_ptr == NULL) |
1761 | return (NULL); | |
1762 | ||
0272a10d VZ |
1763 | return png_ptr->io_ptr; |
1764 | } | |
1765 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |