pngread.c
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1 
2 /* pngread.c - read a PNG file
3  *
4  * Last changed in libpng 1.2.30 [August 15, 2008]
5  * For conditions of distribution and use, see copyright notice in png.h
6  * Copyright (c) 1998-2008 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.)
9  *
10  * This file contains routines that an application calls directly to
11  * read a PNG file or stream.
12  */
13 
14 #define PNG_INTERNAL
15 #include "png.h"
16 #if defined(PNG_READ_SUPPORTED)
17 
18 /* Create a PNG structure for reading, and allocate any memory needed. */
21  png_error_ptr error_fn, png_error_ptr warn_fn)
22 {
23 
24 #ifdef PNG_USER_MEM_SUPPORTED
25  return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn,
27 }
28 
29 /* Alternate create PNG structure for reading, and allocate any memory needed. */
32  png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
33  png_malloc_ptr malloc_fn, png_free_ptr free_fn)
34 {
35 #endif /* PNG_USER_MEM_SUPPORTED */
36 
37 #ifdef PNG_SETJMP_SUPPORTED
38  volatile
39 #endif
40  png_structp png_ptr;
41 
42 #ifdef PNG_SETJMP_SUPPORTED
43 #ifdef USE_FAR_KEYWORD
44  jmp_buf jmpbuf;
45 #endif
46 #endif
47 
48  int i;
49 
50  png_debug(1, "in png_create_read_struct\n");
51 #ifdef PNG_USER_MEM_SUPPORTED
52  png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
53  (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
54 #else
55  png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
56 #endif
57  if (png_ptr == NULL)
58  return (NULL);
59 
60  /* added at libpng-1.2.6 */
61 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
62  png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
63  png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
64 #endif
65 
66 #ifdef PNG_SETJMP_SUPPORTED
67 #ifdef USE_FAR_KEYWORD
68  if (setjmp(jmpbuf))
69 #else
70  if (setjmp(png_ptr->jmpbuf))
71 #endif
72  {
73  png_free(png_ptr, png_ptr->zbuf);
74  png_ptr->zbuf = NULL;
75 #ifdef PNG_USER_MEM_SUPPORTED
77  (png_free_ptr)free_fn, (png_voidp)mem_ptr);
78 #else
79  png_destroy_struct((png_voidp)png_ptr);
80 #endif
81  return (NULL);
82  }
83 #ifdef USE_FAR_KEYWORD
84  png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
85 #endif
86 #endif
87 
88 #ifdef PNG_USER_MEM_SUPPORTED
89  png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
90 #endif
91 
92  png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
93 
94  if (user_png_ver)
95  {
96  i = 0;
97  do
98  {
99  if (user_png_ver[i] != png_libpng_ver[i])
100  png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
101  } while (png_libpng_ver[i++]);
102  }
103  else
104  png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
105 
106 
107  if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
108  {
109  /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
110  * we must recompile any applications that use any older library version.
111  * For versions after libpng 1.0, we will be compatible, so we need
112  * only check the first digit.
113  */
114  if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
115  (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
116  (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
117  {
118 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
119  char msg[80];
120  if (user_png_ver)
121  {
122  png_snprintf(msg, 80,
123  "Application was compiled with png.h from libpng-%.20s",
124  user_png_ver);
125  png_warning(png_ptr, msg);
126  }
127  png_snprintf(msg, 80,
128  "Application is running with png.c from libpng-%.20s",
130  png_warning(png_ptr, msg);
131 #endif
132 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
133  png_ptr->flags = 0;
134 #endif
135  png_error(png_ptr,
136  "Incompatible libpng version in application and library");
137  }
138  }
139 
140  /* initialize zbuf - compression buffer */
141  png_ptr->zbuf_size = PNG_ZBUF_SIZE;
142  png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
143  (png_uint_32)png_ptr->zbuf_size);
144  png_ptr->zstream.zalloc = png_zalloc;
145  png_ptr->zstream.zfree = png_zfree;
146  png_ptr->zstream.opaque = (voidpf)png_ptr;
147 
148  switch (inflateInit(&png_ptr->zstream))
149  {
150  case Z_OK: /* Do nothing */ break;
151  case Z_MEM_ERROR:
152  case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break;
153  case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break;
154  default: png_error(png_ptr, "Unknown zlib error");
155  }
156 
157  png_ptr->zstream.next_out = png_ptr->zbuf;
158  png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
159 
161 
162 #ifdef PNG_SETJMP_SUPPORTED
163 /* Applications that neglect to set up their own setjmp() and then encounter
164  a png_error() will longjmp here. Since the jmpbuf is then meaningless we
165  abort instead of returning. */
166 #ifdef USE_FAR_KEYWORD
167  if (setjmp(jmpbuf))
168  PNG_ABORT();
169  png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
170 #else
171  if (setjmp(png_ptr->jmpbuf))
172  PNG_ABORT();
173 #endif
174 #endif
175  return (png_ptr);
176 }
177 
178 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
179 /* Initialize PNG structure for reading, and allocate any memory needed.
180  This interface is deprecated in favour of the png_create_read_struct(),
181  and it will disappear as of libpng-1.3.0. */
182 #undef png_read_init
183 void PNGAPI
185 {
186  /* We only come here via pre-1.0.7-compiled applications */
187  png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
188 }
189 
190 void PNGAPI
192  png_size_t png_struct_size, png_size_t png_info_size)
193 {
194  /* We only come here via pre-1.0.12-compiled applications */
195  if (png_ptr == NULL) return;
196 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
197  if (png_sizeof(png_struct) > png_struct_size ||
198  png_sizeof(png_info) > png_info_size)
199  {
200  char msg[80];
201  png_ptr->warning_fn = NULL;
202  if (user_png_ver)
203  {
204  png_snprintf(msg, 80,
205  "Application was compiled with png.h from libpng-%.20s",
206  user_png_ver);
207  png_warning(png_ptr, msg);
208  }
209  png_snprintf(msg, 80,
210  "Application is running with png.c from libpng-%.20s",
212  png_warning(png_ptr, msg);
213  }
214 #endif
215  if (png_sizeof(png_struct) > png_struct_size)
216  {
217  png_ptr->error_fn = NULL;
218 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
219  png_ptr->flags = 0;
220 #endif
221  png_error(png_ptr,
222  "The png struct allocated by the application for reading is too small.");
223  }
224  if (png_sizeof(png_info) > png_info_size)
225  {
226  png_ptr->error_fn = NULL;
227 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
228  png_ptr->flags = 0;
229 #endif
230  png_error(png_ptr,
231  "The info struct allocated by application for reading is too small.");
232  }
233  png_read_init_3(&png_ptr, user_png_ver, png_struct_size);
234 }
235 #endif /* PNG_1_0_X || PNG_1_2_X */
236 
237 void PNGAPI
239  png_size_t png_struct_size)
240 {
241 #ifdef PNG_SETJMP_SUPPORTED
242  jmp_buf tmp_jmp; /* to save current jump buffer */
243 #endif
244 
245  int i = 0;
246 
247  png_structp png_ptr=*ptr_ptr;
248 
249  if (png_ptr == NULL) return;
250 
251  do
252  {
253  if (user_png_ver[i] != png_libpng_ver[i])
254  {
255 #ifdef PNG_LEGACY_SUPPORTED
256  png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
257 #else
258  png_ptr->warning_fn = NULL;
259  png_warning(png_ptr,
260  "Application uses deprecated png_read_init() and should be recompiled.");
261  break;
262 #endif
263  }
264  } while (png_libpng_ver[i++]);
265 
266  png_debug(1, "in png_read_init_3\n");
267 
268 #ifdef PNG_SETJMP_SUPPORTED
269  /* save jump buffer and error functions */
270  png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
271 #endif
272 
273  if (png_sizeof(png_struct) > png_struct_size)
274  {
275  png_destroy_struct(png_ptr);
276  *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
277  png_ptr = *ptr_ptr;
278  }
279 
280  /* reset all variables to 0 */
281  png_memset(png_ptr, 0, png_sizeof(png_struct));
282 
283 #ifdef PNG_SETJMP_SUPPORTED
284  /* restore jump buffer */
285  png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
286 #endif
287 
288  /* added at libpng-1.2.6 */
289 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
290  png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
291  png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
292 #endif
293 
294  /* initialize zbuf - compression buffer */
295  png_ptr->zbuf_size = PNG_ZBUF_SIZE;
296  png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
297  (png_uint_32)png_ptr->zbuf_size);
298  png_ptr->zstream.zalloc = png_zalloc;
299  png_ptr->zstream.zfree = png_zfree;
300  png_ptr->zstream.opaque = (voidpf)png_ptr;
301 
302  switch (inflateInit(&png_ptr->zstream))
303  {
304  case Z_OK: /* Do nothing */ break;
305  case Z_MEM_ERROR:
306  case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break;
307  case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break;
308  default: png_error(png_ptr, "Unknown zlib error");
309  }
310 
311  png_ptr->zstream.next_out = png_ptr->zbuf;
312  png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
313 
315 }
316 
317 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
318 /* Read the information before the actual image data. This has been
319  * changed in v0.90 to allow reading a file that already has the magic
320  * bytes read from the stream. You can tell libpng how many bytes have
321  * been read from the beginning of the stream (up to the maximum of 8)
322  * via png_set_sig_bytes(), and we will only check the remaining bytes
323  * here. The application can then have access to the signature bytes we
324  * read if it is determined that this isn't a valid PNG file.
325  */
326 void PNGAPI
328 {
329  if (png_ptr == NULL || info_ptr == NULL) return;
330  png_debug(1, "in png_read_info\n");
331  /* If we haven't checked all of the PNG signature bytes, do so now. */
332  if (png_ptr->sig_bytes < 8)
333  {
334  png_size_t num_checked = png_ptr->sig_bytes,
335  num_to_check = 8 - num_checked;
336 
337  png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
338  png_ptr->sig_bytes = 8;
339 
340  if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
341  {
342  if (num_checked < 4 &&
343  png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
344  png_error(png_ptr, "Not a PNG file");
345  else
346  png_error(png_ptr, "PNG file corrupted by ASCII conversion");
347  }
348  if (num_checked < 3)
349  png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
350  }
351 
352  for (;;)
353  {
354 #ifdef PNG_USE_LOCAL_ARRAYS
359 #if defined(PNG_READ_bKGD_SUPPORTED)
361 #endif
362 #if defined(PNG_READ_cHRM_SUPPORTED)
364 #endif
365 #if defined(PNG_READ_gAMA_SUPPORTED)
367 #endif
368 #if defined(PNG_READ_hIST_SUPPORTED)
370 #endif
371 #if defined(PNG_READ_iCCP_SUPPORTED)
373 #endif
374 #if defined(PNG_READ_iTXt_SUPPORTED)
376 #endif
377 #if defined(PNG_READ_oFFs_SUPPORTED)
379 #endif
380 #if defined(PNG_READ_pCAL_SUPPORTED)
382 #endif
383 #if defined(PNG_READ_pHYs_SUPPORTED)
385 #endif
386 #if defined(PNG_READ_sBIT_SUPPORTED)
388 #endif
389 #if defined(PNG_READ_sCAL_SUPPORTED)
391 #endif
392 #if defined(PNG_READ_sPLT_SUPPORTED)
394 #endif
395 #if defined(PNG_READ_sRGB_SUPPORTED)
397 #endif
398 #if defined(PNG_READ_tEXt_SUPPORTED)
400 #endif
401 #if defined(PNG_READ_tIME_SUPPORTED)
403 #endif
404 #if defined(PNG_READ_tRNS_SUPPORTED)
406 #endif
407 #if defined(PNG_READ_zTXt_SUPPORTED)
409 #endif
410 #endif /* PNG_USE_LOCAL_ARRAYS */
412  PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
413 
414  /* This should be a binary subdivision search or a hash for
415  * matching the chunk name rather than a linear search.
416  */
417  if (!png_memcmp(chunk_name, png_IDAT, 4))
418  if (png_ptr->mode & PNG_AFTER_IDAT)
419  png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
420 
421  if (!png_memcmp(chunk_name, png_IHDR, 4))
422  png_handle_IHDR(png_ptr, info_ptr, length);
423  else if (!png_memcmp(chunk_name, png_IEND, 4))
424  png_handle_IEND(png_ptr, info_ptr, length);
425 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
426  else if (png_handle_as_unknown(png_ptr, chunk_name))
427  {
428  if (!png_memcmp(chunk_name, png_IDAT, 4))
429  png_ptr->mode |= PNG_HAVE_IDAT;
430  png_handle_unknown(png_ptr, info_ptr, length);
431  if (!png_memcmp(chunk_name, png_PLTE, 4))
432  png_ptr->mode |= PNG_HAVE_PLTE;
433  else if (!png_memcmp(chunk_name, png_IDAT, 4))
434  {
435  if (!(png_ptr->mode & PNG_HAVE_IHDR))
436  png_error(png_ptr, "Missing IHDR before IDAT");
437  else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
438  !(png_ptr->mode & PNG_HAVE_PLTE))
439  png_error(png_ptr, "Missing PLTE before IDAT");
440  break;
441  }
442  }
443 #endif
444  else if (!png_memcmp(chunk_name, png_PLTE, 4))
445  png_handle_PLTE(png_ptr, info_ptr, length);
446  else if (!png_memcmp(chunk_name, png_IDAT, 4))
447  {
448  if (!(png_ptr->mode & PNG_HAVE_IHDR))
449  png_error(png_ptr, "Missing IHDR before IDAT");
450  else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
451  !(png_ptr->mode & PNG_HAVE_PLTE))
452  png_error(png_ptr, "Missing PLTE before IDAT");
453 
454  png_ptr->idat_size = length;
455  png_ptr->mode |= PNG_HAVE_IDAT;
456  break;
457  }
458 #if defined(PNG_READ_bKGD_SUPPORTED)
459  else if (!png_memcmp(chunk_name, png_bKGD, 4))
460  png_handle_bKGD(png_ptr, info_ptr, length);
461 #endif
462 #if defined(PNG_READ_cHRM_SUPPORTED)
463  else if (!png_memcmp(chunk_name, png_cHRM, 4))
464  png_handle_cHRM(png_ptr, info_ptr, length);
465 #endif
466 #if defined(PNG_READ_gAMA_SUPPORTED)
467  else if (!png_memcmp(chunk_name, png_gAMA, 4))
468  png_handle_gAMA(png_ptr, info_ptr, length);
469 #endif
470 #if defined(PNG_READ_hIST_SUPPORTED)
471  else if (!png_memcmp(chunk_name, png_hIST, 4))
472  png_handle_hIST(png_ptr, info_ptr, length);
473 #endif
474 #if defined(PNG_READ_oFFs_SUPPORTED)
475  else if (!png_memcmp(chunk_name, png_oFFs, 4))
476  png_handle_oFFs(png_ptr, info_ptr, length);
477 #endif
478 #if defined(PNG_READ_pCAL_SUPPORTED)
479  else if (!png_memcmp(chunk_name, png_pCAL, 4))
480  png_handle_pCAL(png_ptr, info_ptr, length);
481 #endif
482 #if defined(PNG_READ_sCAL_SUPPORTED)
483  else if (!png_memcmp(chunk_name, png_sCAL, 4))
484  png_handle_sCAL(png_ptr, info_ptr, length);
485 #endif
486 #if defined(PNG_READ_pHYs_SUPPORTED)
487  else if (!png_memcmp(chunk_name, png_pHYs, 4))
488  png_handle_pHYs(png_ptr, info_ptr, length);
489 #endif
490 #if defined(PNG_READ_sBIT_SUPPORTED)
491  else if (!png_memcmp(chunk_name, png_sBIT, 4))
492  png_handle_sBIT(png_ptr, info_ptr, length);
493 #endif
494 #if defined(PNG_READ_sRGB_SUPPORTED)
495  else if (!png_memcmp(chunk_name, png_sRGB, 4))
496  png_handle_sRGB(png_ptr, info_ptr, length);
497 #endif
498 #if defined(PNG_READ_iCCP_SUPPORTED)
499  else if (!png_memcmp(chunk_name, png_iCCP, 4))
500  png_handle_iCCP(png_ptr, info_ptr, length);
501 #endif
502 #if defined(PNG_READ_sPLT_SUPPORTED)
503  else if (!png_memcmp(chunk_name, png_sPLT, 4))
504  png_handle_sPLT(png_ptr, info_ptr, length);
505 #endif
506 #if defined(PNG_READ_tEXt_SUPPORTED)
507  else if (!png_memcmp(chunk_name, png_tEXt, 4))
508  png_handle_tEXt(png_ptr, info_ptr, length);
509 #endif
510 #if defined(PNG_READ_tIME_SUPPORTED)
511  else if (!png_memcmp(chunk_name, png_tIME, 4))
512  png_handle_tIME(png_ptr, info_ptr, length);
513 #endif
514 #if defined(PNG_READ_tRNS_SUPPORTED)
515  else if (!png_memcmp(chunk_name, png_tRNS, 4))
516  png_handle_tRNS(png_ptr, info_ptr, length);
517 #endif
518 #if defined(PNG_READ_zTXt_SUPPORTED)
519  else if (!png_memcmp(chunk_name, png_zTXt, 4))
520  png_handle_zTXt(png_ptr, info_ptr, length);
521 #endif
522 #if defined(PNG_READ_iTXt_SUPPORTED)
523  else if (!png_memcmp(chunk_name, png_iTXt, 4))
524  png_handle_iTXt(png_ptr, info_ptr, length);
525 #endif
526  else
527  png_handle_unknown(png_ptr, info_ptr, length);
528  }
529 }
530 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
531 
532 /* optional call to update the users info_ptr structure */
533 void PNGAPI
535 {
536  png_debug(1, "in png_read_update_info\n");
537  if (png_ptr == NULL) return;
538  if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
539  png_read_start_row(png_ptr);
540  else
541  png_warning(png_ptr,
542  "Ignoring extra png_read_update_info() call; row buffer not reallocated");
543  png_read_transform_info(png_ptr, info_ptr);
544 }
545 
546 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
547 /* Initialize palette, background, etc, after transformations
548  * are set, but before any reading takes place. This allows
549  * the user to obtain a gamma-corrected palette, for example.
550  * If the user doesn't call this, we will do it ourselves.
551  */
552 void PNGAPI
554 {
555  png_debug(1, "in png_start_read_image\n");
556  if (png_ptr == NULL) return;
557  if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
558  png_read_start_row(png_ptr);
559 }
560 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
561 
562 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
563 void PNGAPI
565 {
566 #ifdef PNG_USE_LOCAL_ARRAYS
568  PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
569  0xff};
570  PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
571 #endif
572  int ret;
573  if (png_ptr == NULL) return;
574  png_debug2(1, "in png_read_row (row %lu, pass %d)\n",
575  png_ptr->row_number, png_ptr->pass);
576  if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
577  png_read_start_row(png_ptr);
578  if (png_ptr->row_number == 0 && png_ptr->pass == 0)
579  {
580  /* check for transforms that have been set but were defined out */
581 #if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)
582  if (png_ptr->transformations & PNG_INVERT_MONO)
583  png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined.");
584 #endif
585 #if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED)
586  if (png_ptr->transformations & PNG_FILLER)
587  png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined.");
588 #endif
589 #if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED)
590  if (png_ptr->transformations & PNG_PACKSWAP)
591  png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined.");
592 #endif
593 #if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED)
594  if (png_ptr->transformations & PNG_PACK)
595  png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined.");
596 #endif
597 #if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED)
598  if (png_ptr->transformations & PNG_SHIFT)
599  png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined.");
600 #endif
601 #if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED)
602  if (png_ptr->transformations & PNG_BGR)
603  png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined.");
604 #endif
605 #if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED)
606  if (png_ptr->transformations & PNG_SWAP_BYTES)
607  png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined.");
608 #endif
609  }
610 
611 #if defined(PNG_READ_INTERLACING_SUPPORTED)
612  /* if interlaced and we do not need a new row, combine row and return */
613  if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
614  {
615  switch (png_ptr->pass)
616  {
617  case 0:
618  if (png_ptr->row_number & 0x07)
619  {
620  if (dsp_row != NULL)
621  png_combine_row(png_ptr, dsp_row,
622  png_pass_dsp_mask[png_ptr->pass]);
623  png_read_finish_row(png_ptr);
624  return;
625  }
626  break;
627  case 1:
628  if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
629  {
630  if (dsp_row != NULL)
631  png_combine_row(png_ptr, dsp_row,
632  png_pass_dsp_mask[png_ptr->pass]);
633  png_read_finish_row(png_ptr);
634  return;
635  }
636  break;
637  case 2:
638  if ((png_ptr->row_number & 0x07) != 4)
639  {
640  if (dsp_row != NULL && (png_ptr->row_number & 4))
641  png_combine_row(png_ptr, dsp_row,
642  png_pass_dsp_mask[png_ptr->pass]);
643  png_read_finish_row(png_ptr);
644  return;
645  }
646  break;
647  case 3:
648  if ((png_ptr->row_number & 3) || png_ptr->width < 3)
649  {
650  if (dsp_row != NULL)
651  png_combine_row(png_ptr, dsp_row,
652  png_pass_dsp_mask[png_ptr->pass]);
653  png_read_finish_row(png_ptr);
654  return;
655  }
656  break;
657  case 4:
658  if ((png_ptr->row_number & 3) != 2)
659  {
660  if (dsp_row != NULL && (png_ptr->row_number & 2))
661  png_combine_row(png_ptr, dsp_row,
662  png_pass_dsp_mask[png_ptr->pass]);
663  png_read_finish_row(png_ptr);
664  return;
665  }
666  break;
667  case 5:
668  if ((png_ptr->row_number & 1) || png_ptr->width < 2)
669  {
670  if (dsp_row != NULL)
671  png_combine_row(png_ptr, dsp_row,
672  png_pass_dsp_mask[png_ptr->pass]);
673  png_read_finish_row(png_ptr);
674  return;
675  }
676  break;
677  case 6:
678  if (!(png_ptr->row_number & 1))
679  {
680  png_read_finish_row(png_ptr);
681  return;
682  }
683  break;
684  }
685  }
686 #endif
687 
688  if (!(png_ptr->mode & PNG_HAVE_IDAT))
689  png_error(png_ptr, "Invalid attempt to read row data");
690 
691  png_ptr->zstream.next_out = png_ptr->row_buf;
692  png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
693  do
694  {
695  if (!(png_ptr->zstream.avail_in))
696  {
697  while (!png_ptr->idat_size)
698  {
699  png_crc_finish(png_ptr, 0);
700 
701  png_ptr->idat_size = png_read_chunk_header(png_ptr);
702  if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
703  png_error(png_ptr, "Not enough image data");
704  }
705  png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
706  png_ptr->zstream.next_in = png_ptr->zbuf;
707  if (png_ptr->zbuf_size > png_ptr->idat_size)
708  png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;
709  png_crc_read(png_ptr, png_ptr->zbuf,
710  (png_size_t)png_ptr->zstream.avail_in);
711  png_ptr->idat_size -= png_ptr->zstream.avail_in;
712  }
713  ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
714  if (ret == Z_STREAM_END)
715  {
716  if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in ||
717  png_ptr->idat_size)
718  png_error(png_ptr, "Extra compressed data");
719  png_ptr->mode |= PNG_AFTER_IDAT;
720  png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
721  break;
722  }
723  if (ret != Z_OK)
724  png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :
725  "Decompression error");
726 
727  } while (png_ptr->zstream.avail_out);
728 
729  png_ptr->row_info.color_type = png_ptr->color_type;
730  png_ptr->row_info.width = png_ptr->iwidth;
731  png_ptr->row_info.channels = png_ptr->channels;
732  png_ptr->row_info.bit_depth = png_ptr->bit_depth;
733  png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
734  png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
735  png_ptr->row_info.width);
736 
737  if (png_ptr->row_buf[0])
738  png_read_filter_row(png_ptr, &(png_ptr->row_info),
739  png_ptr->row_buf + 1, png_ptr->prev_row + 1,
740  (int)(png_ptr->row_buf[0]));
741 
742  png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
743  png_ptr->rowbytes + 1);
744 
745 #if defined(PNG_MNG_FEATURES_SUPPORTED)
746  if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
747  (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
748  {
749  /* Intrapixel differencing */
750  png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
751  }
752 #endif
753 
754 
755  if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
757 
758 #if defined(PNG_READ_INTERLACING_SUPPORTED)
759  /* blow up interlaced rows to full size */
760  if (png_ptr->interlaced &&
761  (png_ptr->transformations & PNG_INTERLACE))
762  {
763  if (png_ptr->pass < 6)
764 /* old interface (pre-1.0.9):
765  png_do_read_interlace(&(png_ptr->row_info),
766  png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
767  */
768  png_do_read_interlace(png_ptr);
769 
770  if (dsp_row != NULL)
771  png_combine_row(png_ptr, dsp_row,
772  png_pass_dsp_mask[png_ptr->pass]);
773  if (row != NULL)
774  png_combine_row(png_ptr, row,
775  png_pass_mask[png_ptr->pass]);
776  }
777  else
778 #endif
779  {
780  if (row != NULL)
781  png_combine_row(png_ptr, row, 0xff);
782  if (dsp_row != NULL)
783  png_combine_row(png_ptr, dsp_row, 0xff);
784  }
785  png_read_finish_row(png_ptr);
786 
787  if (png_ptr->read_row_fn != NULL)
788  (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
789 }
790 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
791 
792 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
793 /* Read one or more rows of image data. If the image is interlaced,
794  * and png_set_interlace_handling() has been called, the rows need to
795  * contain the contents of the rows from the previous pass. If the
796  * image has alpha or transparency, and png_handle_alpha()[*] has been
797  * called, the rows contents must be initialized to the contents of the
798  * screen.
799  *
800  * "row" holds the actual image, and pixels are placed in it
801  * as they arrive. If the image is displayed after each pass, it will
802  * appear to "sparkle" in. "display_row" can be used to display a
803  * "chunky" progressive image, with finer detail added as it becomes
804  * available. If you do not want this "chunky" display, you may pass
805  * NULL for display_row. If you do not want the sparkle display, and
806  * you have not called png_handle_alpha(), you may pass NULL for rows.
807  * If you have called png_handle_alpha(), and the image has either an
808  * alpha channel or a transparency chunk, you must provide a buffer for
809  * rows. In this case, you do not have to provide a display_row buffer
810  * also, but you may. If the image is not interlaced, or if you have
811  * not called png_set_interlace_handling(), the display_row buffer will
812  * be ignored, so pass NULL to it.
813  *
814  * [*] png_handle_alpha() does not exist yet, as of this version of libpng
815  */
816 
817 void PNGAPI
820 {
821  png_uint_32 i;
822  png_bytepp rp;
823  png_bytepp dp;
824 
825  png_debug(1, "in png_read_rows\n");
826  if (png_ptr == NULL) return;
827  rp = row;
828  dp = display_row;
829  if (rp != NULL && dp != NULL)
830  for (i = 0; i < num_rows; i++)
831  {
832  png_bytep rptr = *rp++;
833  png_bytep dptr = *dp++;
834 
835  png_read_row(png_ptr, rptr, dptr);
836  }
837  else if (rp != NULL)
838  for (i = 0; i < num_rows; i++)
839  {
840  png_bytep rptr = *rp;
841  png_read_row(png_ptr, rptr, png_bytep_NULL);
842  rp++;
843  }
844  else if (dp != NULL)
845  for (i = 0; i < num_rows; i++)
846  {
847  png_bytep dptr = *dp;
848  png_read_row(png_ptr, png_bytep_NULL, dptr);
849  dp++;
850  }
851 }
852 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
853 
854 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
855 /* Read the entire image. If the image has an alpha channel or a tRNS
856  * chunk, and you have called png_handle_alpha()[*], you will need to
857  * initialize the image to the current image that PNG will be overlaying.
858  * We set the num_rows again here, in case it was incorrectly set in
859  * png_read_start_row() by a call to png_read_update_info() or
860  * png_start_read_image() if png_set_interlace_handling() wasn't called
861  * prior to either of these functions like it should have been. You can
862  * only call this function once. If you desire to have an image for
863  * each pass of a interlaced image, use png_read_rows() instead.
864  *
865  * [*] png_handle_alpha() does not exist yet, as of this version of libpng
866  */
867 void PNGAPI
869 {
871  int pass, j;
872  png_bytepp rp;
873 
874  png_debug(1, "in png_read_image\n");
875  if (png_ptr == NULL) return;
876 
877 #ifdef PNG_READ_INTERLACING_SUPPORTED
878  pass = png_set_interlace_handling(png_ptr);
879 #else
880  if (png_ptr->interlaced)
881  png_error(png_ptr,
882  "Cannot read interlaced image -- interlace handler disabled.");
883  pass = 1;
884 #endif
885 
886 
887  image_height=png_ptr->height;
888  png_ptr->num_rows = image_height; /* Make sure this is set correctly */
889 
890  for (j = 0; j < pass; j++)
891  {
892  rp = image;
893  for (i = 0; i < image_height; i++)
894  {
895  png_read_row(png_ptr, *rp, png_bytep_NULL);
896  rp++;
897  }
898  }
899 }
900 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
901 
902 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
903 /* Read the end of the PNG file. Will not read past the end of the
904  * file, will verify the end is accurate, and will read any comments
905  * or time information at the end of the file, if info is not NULL.
906  */
907 void PNGAPI
909 {
910  png_debug(1, "in png_read_end\n");
911  if (png_ptr == NULL) return;
912  png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
913 
914  do
915  {
916 #ifdef PNG_USE_LOCAL_ARRAYS
921 #if defined(PNG_READ_bKGD_SUPPORTED)
923 #endif
924 #if defined(PNG_READ_cHRM_SUPPORTED)
926 #endif
927 #if defined(PNG_READ_gAMA_SUPPORTED)
929 #endif
930 #if defined(PNG_READ_hIST_SUPPORTED)
932 #endif
933 #if defined(PNG_READ_iCCP_SUPPORTED)
935 #endif
936 #if defined(PNG_READ_iTXt_SUPPORTED)
938 #endif
939 #if defined(PNG_READ_oFFs_SUPPORTED)
941 #endif
942 #if defined(PNG_READ_pCAL_SUPPORTED)
944 #endif
945 #if defined(PNG_READ_pHYs_SUPPORTED)
947 #endif
948 #if defined(PNG_READ_sBIT_SUPPORTED)
950 #endif
951 #if defined(PNG_READ_sCAL_SUPPORTED)
953 #endif
954 #if defined(PNG_READ_sPLT_SUPPORTED)
956 #endif
957 #if defined(PNG_READ_sRGB_SUPPORTED)
959 #endif
960 #if defined(PNG_READ_tEXt_SUPPORTED)
962 #endif
963 #if defined(PNG_READ_tIME_SUPPORTED)
965 #endif
966 #if defined(PNG_READ_tRNS_SUPPORTED)
968 #endif
969 #if defined(PNG_READ_zTXt_SUPPORTED)
971 #endif
972 #endif /* PNG_USE_LOCAL_ARRAYS */
974  PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
975 
976  if (!png_memcmp(chunk_name, png_IHDR, 4))
977  png_handle_IHDR(png_ptr, info_ptr, length);
978  else if (!png_memcmp(chunk_name, png_IEND, 4))
979  png_handle_IEND(png_ptr, info_ptr, length);
980 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
981  else if (png_handle_as_unknown(png_ptr, chunk_name))
982  {
983  if (!png_memcmp(chunk_name, png_IDAT, 4))
984  {
985  if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
986  png_error(png_ptr, "Too many IDAT's found");
987  }
988  png_handle_unknown(png_ptr, info_ptr, length);
989  if (!png_memcmp(chunk_name, png_PLTE, 4))
990  png_ptr->mode |= PNG_HAVE_PLTE;
991  }
992 #endif
993  else if (!png_memcmp(chunk_name, png_IDAT, 4))
994  {
995  /* Zero length IDATs are legal after the last IDAT has been
996  * read, but not after other chunks have been read.
997  */
998  if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
999  png_error(png_ptr, "Too many IDAT's found");
1000  png_crc_finish(png_ptr, length);
1001  }
1002  else if (!png_memcmp(chunk_name, png_PLTE, 4))
1003  png_handle_PLTE(png_ptr, info_ptr, length);
1004 #if defined(PNG_READ_bKGD_SUPPORTED)
1005  else if (!png_memcmp(chunk_name, png_bKGD, 4))
1006  png_handle_bKGD(png_ptr, info_ptr, length);
1007 #endif
1008 #if defined(PNG_READ_cHRM_SUPPORTED)
1009  else if (!png_memcmp(chunk_name, png_cHRM, 4))
1010  png_handle_cHRM(png_ptr, info_ptr, length);
1011 #endif
1012 #if defined(PNG_READ_gAMA_SUPPORTED)
1013  else if (!png_memcmp(chunk_name, png_gAMA, 4))
1014  png_handle_gAMA(png_ptr, info_ptr, length);
1015 #endif
1016 #if defined(PNG_READ_hIST_SUPPORTED)
1017  else if (!png_memcmp(chunk_name, png_hIST, 4))
1018  png_handle_hIST(png_ptr, info_ptr, length);
1019 #endif
1020 #if defined(PNG_READ_oFFs_SUPPORTED)
1021  else if (!png_memcmp(chunk_name, png_oFFs, 4))
1022  png_handle_oFFs(png_ptr, info_ptr, length);
1023 #endif
1024 #if defined(PNG_READ_pCAL_SUPPORTED)
1025  else if (!png_memcmp(chunk_name, png_pCAL, 4))
1026  png_handle_pCAL(png_ptr, info_ptr, length);
1027 #endif
1028 #if defined(PNG_READ_sCAL_SUPPORTED)
1029  else if (!png_memcmp(chunk_name, png_sCAL, 4))
1030  png_handle_sCAL(png_ptr, info_ptr, length);
1031 #endif
1032 #if defined(PNG_READ_pHYs_SUPPORTED)
1033  else if (!png_memcmp(chunk_name, png_pHYs, 4))
1034  png_handle_pHYs(png_ptr, info_ptr, length);
1035 #endif
1036 #if defined(PNG_READ_sBIT_SUPPORTED)
1037  else if (!png_memcmp(chunk_name, png_sBIT, 4))
1038  png_handle_sBIT(png_ptr, info_ptr, length);
1039 #endif
1040 #if defined(PNG_READ_sRGB_SUPPORTED)
1041  else if (!png_memcmp(chunk_name, png_sRGB, 4))
1042  png_handle_sRGB(png_ptr, info_ptr, length);
1043 #endif
1044 #if defined(PNG_READ_iCCP_SUPPORTED)
1045  else if (!png_memcmp(chunk_name, png_iCCP, 4))
1046  png_handle_iCCP(png_ptr, info_ptr, length);
1047 #endif
1048 #if defined(PNG_READ_sPLT_SUPPORTED)
1049  else if (!png_memcmp(chunk_name, png_sPLT, 4))
1050  png_handle_sPLT(png_ptr, info_ptr, length);
1051 #endif
1052 #if defined(PNG_READ_tEXt_SUPPORTED)
1053  else if (!png_memcmp(chunk_name, png_tEXt, 4))
1054  png_handle_tEXt(png_ptr, info_ptr, length);
1055 #endif
1056 #if defined(PNG_READ_tIME_SUPPORTED)
1057  else if (!png_memcmp(chunk_name, png_tIME, 4))
1058  png_handle_tIME(png_ptr, info_ptr, length);
1059 #endif
1060 #if defined(PNG_READ_tRNS_SUPPORTED)
1061  else if (!png_memcmp(chunk_name, png_tRNS, 4))
1062  png_handle_tRNS(png_ptr, info_ptr, length);
1063 #endif
1064 #if defined(PNG_READ_zTXt_SUPPORTED)
1065  else if (!png_memcmp(chunk_name, png_zTXt, 4))
1066  png_handle_zTXt(png_ptr, info_ptr, length);
1067 #endif
1068 #if defined(PNG_READ_iTXt_SUPPORTED)
1069  else if (!png_memcmp(chunk_name, png_iTXt, 4))
1070  png_handle_iTXt(png_ptr, info_ptr, length);
1071 #endif
1072  else
1073  png_handle_unknown(png_ptr, info_ptr, length);
1074  } while (!(png_ptr->mode & PNG_HAVE_IEND));
1075 }
1076 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
1077 
1078 /* free all memory used by the read */
1079 void PNGAPI
1082 {
1083  png_structp png_ptr = NULL;
1084  png_infop info_ptr = NULL, end_info_ptr = NULL;
1085 #ifdef PNG_USER_MEM_SUPPORTED
1086  png_free_ptr free_fn = NULL;
1087  png_voidp mem_ptr = NULL;
1088 #endif
1089 
1090  png_debug(1, "in png_destroy_read_struct\n");
1091  if (png_ptr_ptr != NULL)
1092  png_ptr = *png_ptr_ptr;
1093  if (png_ptr == NULL)
1094  return;
1095 
1096 #ifdef PNG_USER_MEM_SUPPORTED
1097  free_fn = png_ptr->free_fn;
1098  mem_ptr = png_ptr->mem_ptr;
1099 #endif
1100 
1101  if (info_ptr_ptr != NULL)
1102  info_ptr = *info_ptr_ptr;
1103 
1104  if (end_info_ptr_ptr != NULL)
1105  end_info_ptr = *end_info_ptr_ptr;
1106 
1107  png_read_destroy(png_ptr, info_ptr, end_info_ptr);
1108 
1109  if (info_ptr != NULL)
1110  {
1111 #if defined(PNG_TEXT_SUPPORTED)
1112  png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1);
1113 #endif
1114 
1115 #ifdef PNG_USER_MEM_SUPPORTED
1116  png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
1117  (png_voidp)mem_ptr);
1118 #else
1119  png_destroy_struct((png_voidp)info_ptr);
1120 #endif
1121  *info_ptr_ptr = NULL;
1122  }
1123 
1124  if (end_info_ptr != NULL)
1125  {
1126 #if defined(PNG_READ_TEXT_SUPPORTED)
1127  png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1);
1128 #endif
1129 #ifdef PNG_USER_MEM_SUPPORTED
1130  png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn,
1131  (png_voidp)mem_ptr);
1132 #else
1133  png_destroy_struct((png_voidp)end_info_ptr);
1134 #endif
1135  *end_info_ptr_ptr = NULL;
1136  }
1137 
1138  if (png_ptr != NULL)
1139  {
1140 #ifdef PNG_USER_MEM_SUPPORTED
1141  png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
1142  (png_voidp)mem_ptr);
1143 #else
1144  png_destroy_struct((png_voidp)png_ptr);
1145 #endif
1146  *png_ptr_ptr = NULL;
1147  }
1148 }
1149 
1150 /* free all memory used by the read (old method) */
1151 void /* PRIVATE */
1153 {
1154 #ifdef PNG_SETJMP_SUPPORTED
1155  jmp_buf tmp_jmp;
1156 #endif
1157  png_error_ptr error_fn;
1158  png_error_ptr warning_fn;
1160 #ifdef PNG_USER_MEM_SUPPORTED
1161  png_free_ptr free_fn;
1162 #endif
1163 
1164  png_debug(1, "in png_read_destroy\n");
1165  if (info_ptr != NULL)
1166  png_info_destroy(png_ptr, info_ptr);
1167 
1168  if (end_info_ptr != NULL)
1169  png_info_destroy(png_ptr, end_info_ptr);
1170 
1171  png_free(png_ptr, png_ptr->zbuf);
1172  png_free(png_ptr, png_ptr->big_row_buf);
1173  png_free(png_ptr, png_ptr->prev_row);
1174  png_free(png_ptr, png_ptr->chunkdata);
1175 #if defined(PNG_READ_DITHER_SUPPORTED)
1176  png_free(png_ptr, png_ptr->palette_lookup);
1177  png_free(png_ptr, png_ptr->dither_index);
1178 #endif
1179 #if defined(PNG_READ_GAMMA_SUPPORTED)
1180  png_free(png_ptr, png_ptr->gamma_table);
1181 #endif
1182 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
1183  png_free(png_ptr, png_ptr->gamma_from_1);
1184  png_free(png_ptr, png_ptr->gamma_to_1);
1185 #endif
1186 #ifdef PNG_FREE_ME_SUPPORTED
1187  if (png_ptr->free_me & PNG_FREE_PLTE)
1188  png_zfree(png_ptr, png_ptr->palette);
1189  png_ptr->free_me &= ~PNG_FREE_PLTE;
1190 #else
1191  if (png_ptr->flags & PNG_FLAG_FREE_PLTE)
1192  png_zfree(png_ptr, png_ptr->palette);
1193  png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
1194 #endif
1195 #if defined(PNG_tRNS_SUPPORTED) || \
1196  defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1197 #ifdef PNG_FREE_ME_SUPPORTED
1198  if (png_ptr->free_me & PNG_FREE_TRNS)
1199  png_free(png_ptr, png_ptr->trans);
1200  png_ptr->free_me &= ~PNG_FREE_TRNS;
1201 #else
1202  if (png_ptr->flags & PNG_FLAG_FREE_TRNS)
1203  png_free(png_ptr, png_ptr->trans);
1204  png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
1205 #endif
1206 #endif
1207 #if defined(PNG_READ_hIST_SUPPORTED)
1208 #ifdef PNG_FREE_ME_SUPPORTED
1209  if (png_ptr->free_me & PNG_FREE_HIST)
1210  png_free(png_ptr, png_ptr->hist);
1211  png_ptr->free_me &= ~PNG_FREE_HIST;
1212 #else
1213  if (png_ptr->flags & PNG_FLAG_FREE_HIST)
1214  png_free(png_ptr, png_ptr->hist);
1215  png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
1216 #endif
1217 #endif
1218 #if defined(PNG_READ_GAMMA_SUPPORTED)
1219  if (png_ptr->gamma_16_table != NULL)
1220  {
1221  int i;
1222  int istop = (1 << (8 - png_ptr->gamma_shift));
1223  for (i = 0; i < istop; i++)
1224  {
1225  png_free(png_ptr, png_ptr->gamma_16_table[i]);
1226  }
1227  png_free(png_ptr, png_ptr->gamma_16_table);
1228  }
1229 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
1230  if (png_ptr->gamma_16_from_1 != NULL)
1231  {
1232  int i;
1233  int istop = (1 << (8 - png_ptr->gamma_shift));
1234  for (i = 0; i < istop; i++)
1235  {
1236  png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
1237  }
1238  png_free(png_ptr, png_ptr->gamma_16_from_1);
1239  }
1240  if (png_ptr->gamma_16_to_1 != NULL)
1241  {
1242  int i;
1243  int istop = (1 << (8 - png_ptr->gamma_shift));
1244  for (i = 0; i < istop; i++)
1245  {
1246  png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
1247  }
1248  png_free(png_ptr, png_ptr->gamma_16_to_1);
1249  }
1250 #endif
1251 #endif
1252 #if defined(PNG_TIME_RFC1123_SUPPORTED)
1253  png_free(png_ptr, png_ptr->time_buffer);
1254 #endif
1255 
1256  inflateEnd(&png_ptr->zstream);
1257 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1258  png_free(png_ptr, png_ptr->save_buffer);
1259 #endif
1260 
1261 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1262 #ifdef PNG_TEXT_SUPPORTED
1263  png_free(png_ptr, png_ptr->current_text);
1264 #endif /* PNG_TEXT_SUPPORTED */
1265 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1266 
1267  /* Save the important info out of the png_struct, in case it is
1268  * being used again.
1269  */
1270 #ifdef PNG_SETJMP_SUPPORTED
1271  png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
1272 #endif
1273 
1274  error_fn = png_ptr->error_fn;
1275  warning_fn = png_ptr->warning_fn;
1276  error_ptr = png_ptr->error_ptr;
1277 #ifdef PNG_USER_MEM_SUPPORTED
1278  free_fn = png_ptr->free_fn;
1279 #endif
1280 
1281  png_memset(png_ptr, 0, png_sizeof(png_struct));
1282 
1283  png_ptr->error_fn = error_fn;
1284  png_ptr->warning_fn = warning_fn;
1285  png_ptr->error_ptr = error_ptr;
1286 #ifdef PNG_USER_MEM_SUPPORTED
1287  png_ptr->free_fn = free_fn;
1288 #endif
1289 
1290 #ifdef PNG_SETJMP_SUPPORTED
1291  png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
1292 #endif
1293 
1294 }
1295 
1296 void PNGAPI
1297 png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
1298 {
1299  if (png_ptr == NULL) return;
1300  png_ptr->read_row_fn = read_row_fn;
1301 }
1302 
1303 
1304 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1305 #if defined(PNG_INFO_IMAGE_SUPPORTED)
1306 void PNGAPI
1308  int transforms,
1309  voidp params)
1310 {
1311  int row;
1312 
1313  if (png_ptr == NULL) return;
1314 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
1315  /* invert the alpha channel from opacity to transparency
1316  */
1317  if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
1318  png_set_invert_alpha(png_ptr);
1319 #endif
1320 
1321  /* png_read_info() gives us all of the information from the
1322  * PNG file before the first IDAT (image data chunk).
1323  */
1324  png_read_info(png_ptr, info_ptr);
1325  if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
1326  png_error(png_ptr, "Image is too high to process with png_read_png()");
1327 
1328  /* -------------- image transformations start here ------------------- */
1329 
1330 #if defined(PNG_READ_16_TO_8_SUPPORTED)
1331  /* tell libpng to strip 16 bit/color files down to 8 bits per color
1332  */
1333  if (transforms & PNG_TRANSFORM_STRIP_16)
1334  png_set_strip_16(png_ptr);
1335 #endif
1336 
1337 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1338  /* Strip alpha bytes from the input data without combining with
1339  * the background (not recommended).
1340  */
1341  if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
1342  png_set_strip_alpha(png_ptr);
1343 #endif
1344 
1345 #if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
1346  /* Extract multiple pixels with bit depths of 1, 2, or 4 from a single
1347  * byte into separate bytes (useful for paletted and grayscale images).
1348  */
1349  if (transforms & PNG_TRANSFORM_PACKING)
1350  png_set_packing(png_ptr);
1351 #endif
1352 
1353 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
1354  /* Change the order of packed pixels to least significant bit first
1355  * (not useful if you are using png_set_packing).
1356  */
1357  if (transforms & PNG_TRANSFORM_PACKSWAP)
1358  png_set_packswap(png_ptr);
1359 #endif
1360 
1361 #if defined(PNG_READ_EXPAND_SUPPORTED)
1362  /* Expand paletted colors into true RGB triplets
1363  * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel
1364  * Expand paletted or RGB images with transparency to full alpha
1365  * channels so the data will be available as RGBA quartets.
1366  */
1367  if (transforms & PNG_TRANSFORM_EXPAND)
1368  if ((png_ptr->bit_depth < 8) ||
1369  (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
1370  (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
1371  png_set_expand(png_ptr);
1372 #endif
1373 
1374  /* We don't handle background color or gamma transformation or dithering.
1375  */
1376 
1377 #if defined(PNG_READ_INVERT_SUPPORTED)
1378  /* invert monochrome files to have 0 as white and 1 as black
1379  */
1380  if (transforms & PNG_TRANSFORM_INVERT_MONO)
1381  png_set_invert_mono(png_ptr);
1382 #endif
1383 
1384 #if defined(PNG_READ_SHIFT_SUPPORTED)
1385  /* If you want to shift the pixel values from the range [0,255] or
1386  * [0,65535] to the original [0,7] or [0,31], or whatever range the
1387  * colors were originally in:
1388  */
1389  if ((transforms & PNG_TRANSFORM_SHIFT)
1390  && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
1391  {
1393 
1394  png_get_sBIT(png_ptr, info_ptr, &sig_bit);
1395  png_set_shift(png_ptr, sig_bit);
1396  }
1397 #endif
1398 
1399 #if defined(PNG_READ_BGR_SUPPORTED)
1400  /* flip the RGB pixels to BGR (or RGBA to BGRA)
1401  */
1402  if (transforms & PNG_TRANSFORM_BGR)
1403  png_set_bgr(png_ptr);
1404 #endif
1405 
1406 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
1407  /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
1408  */
1409  if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
1410  png_set_swap_alpha(png_ptr);
1411 #endif
1412 
1413 #if defined(PNG_READ_SWAP_SUPPORTED)
1414  /* swap bytes of 16 bit files to least significant byte first
1415  */
1416  if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
1417  png_set_swap(png_ptr);
1418 #endif
1419 
1420  /* We don't handle adding filler bytes */
1421 
1422  /* Optional call to gamma correct and add the background to the palette
1423  * and update info structure. REQUIRED if you are expecting libpng to
1424  * update the palette for you (i.e., you selected such a transform above).
1425  */
1426  png_read_update_info(png_ptr, info_ptr);
1427 
1428  /* -------------- image transformations end here ------------------- */
1429 
1430 #ifdef PNG_FREE_ME_SUPPORTED
1431  png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1432 #endif
1433  if (info_ptr->row_pointers == NULL)
1434  {
1435  info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
1436  info_ptr->height * png_sizeof(png_bytep));
1437 #ifdef PNG_FREE_ME_SUPPORTED
1438  info_ptr->free_me |= PNG_FREE_ROWS;
1439 #endif
1440  for (row = 0; row < (int)info_ptr->height; row++)
1441  {
1442  info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
1443  png_get_rowbytes(png_ptr, info_ptr));
1444  }
1445  }
1446 
1447  png_read_image(png_ptr, info_ptr->row_pointers);
1448  info_ptr->valid |= PNG_INFO_IDAT;
1449 
1450  /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
1451  png_read_end(png_ptr, info_ptr);
1452 
1453  transforms = transforms; /* quiet compiler warnings */
1454  params = params;
1455 
1456 }
1457 #endif /* PNG_INFO_IMAGE_SUPPORTED */
1458 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
1459 #endif /* PNG_READ_SUPPORTED */
void png_do_read_intrapixel(png_row_infop row_info, png_bytep row)
Definition: pngrtran.c:4239
void PNGAPI png_set_packing(png_structp png_ptr)
Definition: pngtrans.c:41
PNG_CONST char png_libpng_ver[18]
Definition: png.c:23
#define PNG_FREE_TEXT
Definition: png.h:2098
#define PNG_USER_WIDTH_MAX
Definition: pngconf.h:795
PNG_tRNS
Definition: png.c:52
#define PNG_TRANSFORM_SWAP_ENDIAN
Definition: png.h:1150
png_voidp png_error_ptr png_error_ptr png_voidp png_malloc_ptr malloc_fn
Definition: png.h:1530
void png_zfree(voidpf png_ptr, voidpf ptr)
Definition: png.c:192
void PNGAPI png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, int num)
Definition: png.c:339
#define PNG_TRANSFORM_STRIP_16
Definition: png.h:1141
png_voidp png_create_struct(int type)
Definition: pngmem.c:332
png_voidp error_ptr
Definition: png.h:1506
Byte FAR * voidpf
Definition: zconf.h:283
#define png_snprintf
Definition: pngconf.h:1448
#define PNG_FREE_HIST
Definition: png.h:2088
void png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:597
PNG_PLTE
Definition: png.c:36
png_infop int transforms
Definition: png.h:2505
PNG_sRGB
Definition: png.c:49
void PNGAPI png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
Definition: pngread.c:1297
png_infopp info_ptr_ptr
Definition: png.h:1799
#define PNG_TRANSFORM_INVERT_MONO
Definition: png.h:1146
png_voidp png_error_ptr png_error_ptr png_voidp png_malloc_ptr png_free_ptr free_fn
Definition: png.h:1530
png_uint_32 PNGAPI png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
Definition: pngget.c:16
void PNGAPI png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)
Definition: pngmem.c:587
#define png_malloc_ptr_NULL
Definition: png.h:508
void PNGAPI png_set_invert_alpha(png_structp png_ptr)
Definition: pngtrans.c:157
PNG_sPLT
Definition: png.c:48
#define PNG_TRANSFORM_PACKSWAP
Definition: png.h:1144
#define Z_PARTIAL_FLUSH
Definition: zlib.h:163
#define png_memcmp
Definition: pngconf.h:1464
png_byte FAR * png_bytep
Definition: pngconf.h:1197
#define png_memset
Definition: pngconf.h:1466
#define PNG_COLOR_TYPE_PALETTE
Definition: png.h:1004
void png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:388
void png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:1128
int image_height
void PNGAPI png_read_rows(png_structp png_ptr, png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)
Definition: pngread.c:818
png_size_t png_size_t num_to_check
Definition: png.h:1496
RTC::ReturnCode_t ret(RTC::Local::ReturnCode_t r)
png_infop png_charp png_int_32 png_int_32 int int png_charp png_charpp * params
Definition: png.h:2332
#define PNG_FREE_PLTE
Definition: png.h:2096
PNG_bKGD
Definition: png.c:37
#define PNG_TRANSFORM_BGR
Definition: png.h:1148
#define PNG_HAVE_PLTE
Definition: png.h:2760
#define png_rw_ptr_NULL
Definition: png.h:510
void png_do_read_transformations(png_structp png_ptr)
Definition: pngrtran.c:1269
int PNGAPI png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
Definition: png.c:742
PNG_CONST char FAR * png_const_charp
Definition: pngconf.h:1202
PNG_sCAL
Definition: png.c:45
PNG_cHRM
Definition: png.c:38
void PNGAPI png_set_strip_16(png_structp png_ptr)
Definition: pngrtran.c:103
void png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length)
Definition: pngrutil.c:133
png_infopp png_infopp end_info_ptr_ptr
Definition: png.h:1803
#define PNG_USER_HEIGHT_MAX
Definition: pngconf.h:798
#define Z_STREAM_ERROR
Definition: zlib.h:174
void png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
Definition: pngread.c:1152
void png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:1731
png_voidp png_error_ptr png_error_ptr warning_fn
Definition: png.h:1963
png_bytep png_bytep png_size_t length
Definition: png.h:1541
png_uint_32 i
Definition: png.h:2735
png_struct FAR *FAR * png_structpp
Definition: png.h:1474
png_bytepp image
Definition: png.h:1772
void png_read_finish_row(png_structp png_ptr)
Definition: pngrutil.c:2899
voidpf png_zalloc(voidpf png_ptr, uInt items, uInt size)
Definition: png.c:149
png_bytep chunk_name
Definition: png.h:1541
PNG_zTXt
Definition: png.c:53
void png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:1996
void PNGAPI png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
Definition: pngread.c:564
void PNGAPI png_set_bgr(png_structp png_ptr)
Definition: pngtrans.c:18
png_byte FAR *FAR * png_bytepp
Definition: pngconf.h:1219
PNG_IDAT
Definition: png.c:34
void png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:766
#define PNG_HAVE_IHDR
Definition: png.h:2759
png_bytepp png_bytepp display_row
Definition: png.h:1759
void png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:1456
png_uint_32 PNGAPI png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
Definition: pngget.c:710
#define PNG_ZBUF_SIZE
Definition: pngconf.h:100
void png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
Definition: pngrtran.c:1125
#define png_debug(l, m)
Definition: png.h:2556
#define PNGAPI
Definition: pngconf.h:1386
png_struct FAR * png_structp
Definition: png.h:1108
void png_read_start_row(png_structp png_ptr)
Definition: pngrutil.c:3031
#define PNG_FREE_ROWS
Definition: png.h:2091
void PNGAPI png_read_end(png_structp png_ptr, png_infop info_ptr)
Definition: pngread.c:908
png_read_status_ptr read_row_fn
Definition: png.h:1984
void png_info_destroy(png_structp png_ptr, png_infop info_ptr)
Definition: png.c:594
PNG_pHYs
Definition: png.c:46
PNG_tEXt
Definition: png.c:50
void PNGAPI png_error(png_structp png_ptr, png_const_charp error_message)
Definition: pngerror.c:36
int JSAMPARRAY int int num_rows
Definition: jpegint.h:373
void PNGAPI png_set_packswap(png_structp png_ptr)
Definition: pngtrans.c:56
#define PNG_CONST
Definition: pngconf.h:445
void png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:1917
void png_destroy_struct(png_voidp struct_ptr)
Definition: pngmem.c:386
void PNGAPI png_set_swap(png_structp png_ptr)
Definition: pngtrans.c:29
PNG_sBIT
Definition: png.c:47
png_voidp png_error_ptr error_fn
Definition: png.h:1506
PNG_IHDR
Definition: png.c:33
#define png_memcpy
Definition: pngconf.h:1465
void png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:1597
void png_do_read_interlace(png_structp png_ptr)
Definition: pngrutil.c:2554
void PNGAPI png_warning(png_structp png_ptr, png_const_charp warning_message)
Definition: pngerror.c:102
void png_combine_row(png_structp png_ptr, png_bytep row, int mask)
Definition: pngrutil.c:2348
PNG_CONST int FARDATA png_pass_dsp_mask[]
Definition: png.c:80
#define Z_STREAM_END
Definition: zlib.h:171
PNG_IEND
Definition: png.c:35
#define PNG_UINT_32_MAX
Definition: png.h:989
png_bytepp row
Definition: png.h:1759
void png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:2229
int PNGAPI png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
Definition: png.c:112
#define PNG_HAVE_IDAT
Definition: png.h:2761
#define Z_MEM_ERROR
Definition: zlib.h:176
#define PNG_INFO_sBIT
Definition: png.h:1068
#define PNG_AFTER_IDAT
Definition: png.h:2762
#define PNG_TRANSFORM_PACKING
Definition: png.h:1143
#define PNG_TRANSFORM_INVERT_ALPHA
Definition: png.h:1151
void PNGAPI png_set_strip_alpha(png_structp png_ptr)
Definition: pngrtran.c:113
int png_crc_finish(png_structp png_ptr, png_uint_32 skip)
Definition: pngrutil.c:145
Byte * voidp
Definition: zconf.h:284
void PNGAPI png_read_info(png_structp png_ptr, png_infop info_ptr)
Definition: pngread.c:327
PNG_tIME
Definition: png.c:51
PNG_gAMA
Definition: png.c:39
void PNGAPI png_set_read_fn(png_structp png_ptr, png_voidp io_ptr, png_rw_ptr read_data_fn)
Definition: pngrio.c:137
void PNGAPI png_set_invert_mono(png_structp png_ptr)
Definition: pngtrans.c:167
void PNGAPI png_start_read_image(png_structp png_ptr)
Definition: pngread.c:553
void PNGAPI png_read_init(png_structp png_ptr)
Definition: pngread.c:184
#define PNG_FLAG_MNG_FILTER_64
Definition: png.h:1156
void png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:1272
void png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:911
PNG_hIST
Definition: png.c:40
void png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
Definition: pngrio.c:28
PNG_iTXt
Definition: png.c:42
typedef int
Definition: png.h:1113
png_structp PNGAPI png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)
Definition: pngread.c:31
png_voidp png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
Definition: pngmem.c:342
PNG_CONST int FARDATA png_pass_mask[]
Definition: png.c:76
void png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter)
Definition: pngrutil.c:2776
#define png_free_ptr_NULL
Definition: png.h:506
#define Z_VERSION_ERROR
Definition: zlib.h:178
png_structp PNGAPI png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn)
Definition: pngread.c:20
#define PNG_INFO_IDAT
Definition: png.h:1082
#define png_bytep_NULL
Definition: png.h:501
#define png_voidp_NULL
Definition: png.h:513
#define PNG_INFO_tRNS
Definition: png.h:1071
png_voidp png_error_ptr png_error_ptr warn_fn
Definition: png.h:1506
png_voidp PNGAPI png_memcpy_check(png_structp png_ptr, png_voidp s1, png_voidp s2, png_uint_32 length)
Definition: pngmem.c:556
void PNGAPI png_set_expand(png_structp png_ptr)
Definition: pngrtran.c:546
png_color_8 FAR * png_color_8p
Definition: png.h:593
void png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:1873
int PNGAPI png_set_interlace_handling(png_structp png_ptr)
Definition: pngtrans.c:79
void png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:1553
void FAR * png_voidp
Definition: pngconf.h:1196
void PNGAPI png_read_png(png_structp png_ptr, png_infop info_ptr, int transforms, voidp params)
Definition: pngread.c:1307
#define inflateInit(strm)
Definition: zlib.h:1333
void PNGAPI png_set_shift(png_structp png_ptr, png_color_8p true_bits)
Definition: pngtrans.c:67
#define PNG_TRANSFORM_SWAP_ALPHA
Definition: png.h:1149
void png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:1367
void png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn, png_voidp mem_ptr)
Definition: pngmem.c:394
#define Z_OK
Definition: zlib.h:170
void PNGAPI png_read_image(png_structp png_ptr, png_bytepp image)
Definition: pngread.c:868
void png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:619
size_t png_size_t
Definition: pngconf.h:1128
PNG_pCAL
Definition: png.c:44
void png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:700
#define PNG_TRANSFORM_EXPAND
Definition: png.h:1145
#define PNG_INTRAPIXEL_DIFFERENCING
Definition: png.h:1018
int ZEXPORT inflate(z_streamp strm, int flush)
Definition: inflate.c:554
void png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:1009
png_infop info_ptr
Definition: png.h:1571
#define PNG_TRANSFORM_STRIP_ALPHA
Definition: png.h:1142
unsigned long png_uint_32
Definition: pngconf.h:1116
PNG_iCCP
Definition: png.c:41
#define PNG_ABORT()
Definition: pngconf.h:1418
void PNGAPI png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t png_info_size)
Definition: pngread.c:191
void png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:459
png_voidp png_error_ptr png_error_ptr png_voidp mem_ptr
Definition: png.h:1530
png_info FAR *FAR * png_infopp
Definition: png.h:985
void PNGAPI png_free(png_structp png_ptr, png_voidp ptr)
Definition: pngmem.c:498
#define png_debug2(l, m, p1, p2)
Definition: png.h:2562
png_uint_32 PNGAPI png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
Definition: pngget.c:25
void PNGAPI png_set_swap_alpha(png_structp png_ptr)
Definition: pngtrans.c:146
void PNGAPI png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)
Definition: pngread.c:1080
#define PNG_TRANSFORM_SHIFT
Definition: png.h:1147
void PNGAPI png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, png_size_t png_struct_size)
Definition: pngread.c:238
void png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
Definition: pngrutil.c:1510
void PNGAPI png_set_error_fn(png_structp png_ptr, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)
Definition: pngerror.c:310
void PNGAPI png_read_update_info(png_structp png_ptr, png_infop info_ptr)
Definition: pngread.c:534
int ZEXPORT inflateEnd(z_streamp strm)
Definition: inflate.c:1155
png_voidp PNGAPI png_malloc(png_structp png_ptr, png_uint_32 size)
Definition: pngmem.c:429
PNG_oFFs
Definition: png.c:43
unsigned int uInt
Definition: zconf.h:263
#define PNG_HAVE_IEND
Definition: png.h:2763
#define png_sizeof(x)
Definition: pngconf.h:1129
png_uint_32 png_read_chunk_header(png_structp png_ptr)
Definition: pngrutil.c:106
#define PNG_FREE_TRNS
Definition: png.h:2097
png_infop png_color_8p * sig_bit
Definition: png.h:2360
png_info FAR * png_infop
Definition: png.h:984


openhrp3
Author(s): AIST, General Robotix Inc., Nakamura Lab of Dept. of Mechano Informatics at University of Tokyo
autogenerated on Thu Sep 8 2022 02:24:05