2 /* pngset.c - storage of image information into info struct
4 * Copyright (c) 2018-2022 Cosmin Truta
5 * Copyright (c) 1998-2018 Glenn Randers-Pehrson
6 * Copyright (c) 1996-1997 Andreas Dilger
7 * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
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
13 * The functions here are used during reads to store data from the file
14 * into the info struct, and during writes to store application data
15 * into the info struct for writing into the file. This abstracts the
16 * info struct and allows us to change the structure in the future.
21 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
23 #ifdef PNG_bKGD_SUPPORTED
25 png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,
26 png_const_color_16p background)
28 png_debug1(1, "in %s storage function", "bKGD");
30 if (png_ptr == NULL || info_ptr == NULL || background == NULL)
33 info_ptr->background = *background;
34 info_ptr->valid |= PNG_INFO_bKGD;
38 #ifdef PNG_cHRM_SUPPORTED
40 png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
41 png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
42 png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
43 png_fixed_point blue_x, png_fixed_point blue_y)
47 png_debug1(1, "in %s storage function", "cHRM fixed");
49 if (png_ptr == NULL || info_ptr == NULL)
61 if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy,
62 2/* override with app values*/) != 0)
63 info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
65 png_colorspace_sync_info(png_ptr, info_ptr);
69 png_set_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
70 png_fixed_point int_red_X, png_fixed_point int_red_Y,
71 png_fixed_point int_red_Z, png_fixed_point int_green_X,
72 png_fixed_point int_green_Y, png_fixed_point int_green_Z,
73 png_fixed_point int_blue_X, png_fixed_point int_blue_Y,
74 png_fixed_point int_blue_Z)
78 png_debug1(1, "in %s storage function", "cHRM XYZ fixed");
80 if (png_ptr == NULL || info_ptr == NULL)
83 XYZ.red_X = int_red_X;
84 XYZ.red_Y = int_red_Y;
85 XYZ.red_Z = int_red_Z;
86 XYZ.green_X = int_green_X;
87 XYZ.green_Y = int_green_Y;
88 XYZ.green_Z = int_green_Z;
89 XYZ.blue_X = int_blue_X;
90 XYZ.blue_Y = int_blue_Y;
91 XYZ.blue_Z = int_blue_Z;
93 if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace,
95 info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
97 png_colorspace_sync_info(png_ptr, info_ptr);
100 # ifdef PNG_FLOATING_POINT_SUPPORTED
102 png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
103 double white_x, double white_y, double red_x, double red_y,
104 double green_x, double green_y, double blue_x, double blue_y)
106 png_set_cHRM_fixed(png_ptr, info_ptr,
107 png_fixed(png_ptr, white_x, "cHRM White X"),
108 png_fixed(png_ptr, white_y, "cHRM White Y"),
109 png_fixed(png_ptr, red_x, "cHRM Red X"),
110 png_fixed(png_ptr, red_y, "cHRM Red Y"),
111 png_fixed(png_ptr, green_x, "cHRM Green X"),
112 png_fixed(png_ptr, green_y, "cHRM Green Y"),
113 png_fixed(png_ptr, blue_x, "cHRM Blue X"),
114 png_fixed(png_ptr, blue_y, "cHRM Blue Y"));
118 png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X,
119 double red_Y, double red_Z, double green_X, double green_Y, double green_Z,
120 double blue_X, double blue_Y, double blue_Z)
122 png_set_cHRM_XYZ_fixed(png_ptr, info_ptr,
123 png_fixed(png_ptr, red_X, "cHRM Red X"),
124 png_fixed(png_ptr, red_Y, "cHRM Red Y"),
125 png_fixed(png_ptr, red_Z, "cHRM Red Z"),
126 png_fixed(png_ptr, green_X, "cHRM Green X"),
127 png_fixed(png_ptr, green_Y, "cHRM Green Y"),
128 png_fixed(png_ptr, green_Z, "cHRM Green Z"),
129 png_fixed(png_ptr, blue_X, "cHRM Blue X"),
130 png_fixed(png_ptr, blue_Y, "cHRM Blue Y"),
131 png_fixed(png_ptr, blue_Z, "cHRM Blue Z"));
133 # endif /* FLOATING_POINT */
137 #ifdef PNG_eXIf_SUPPORTED
139 png_set_eXIf(png_const_structrp png_ptr, png_inforp info_ptr,
142 png_warning(png_ptr, "png_set_eXIf does not work; use png_set_eXIf_1");
148 png_set_eXIf_1(png_const_structrp png_ptr, png_inforp info_ptr,
149 png_uint_32 num_exif, png_bytep eXIf_buf)
153 png_debug1(1, "in %s storage function", "eXIf");
155 if (png_ptr == NULL || info_ptr == NULL)
160 png_free(png_ptr, info_ptr->exif);
161 info_ptr->exif = NULL;
164 info_ptr->num_exif = num_exif;
166 info_ptr->exif = png_voidcast(png_bytep, png_malloc_warn(png_ptr,
167 info_ptr->num_exif));
169 if (info_ptr->exif == NULL)
171 png_warning(png_ptr, "Insufficient memory for eXIf chunk data");
175 info_ptr->free_me |= PNG_FREE_EXIF;
177 for (i = 0; i < (int) info_ptr->num_exif; i++)
178 info_ptr->exif[i] = eXIf_buf[i];
180 info_ptr->valid |= PNG_INFO_eXIf;
184 #ifdef PNG_gAMA_SUPPORTED
186 png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
187 png_fixed_point file_gamma)
189 png_debug1(1, "in %s storage function", "gAMA");
191 if (png_ptr == NULL || info_ptr == NULL)
194 png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma);
195 png_colorspace_sync_info(png_ptr, info_ptr);
198 # ifdef PNG_FLOATING_POINT_SUPPORTED
200 png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma)
202 png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma,
208 #ifdef PNG_hIST_SUPPORTED
210 png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
211 png_const_uint_16p hist)
215 png_debug1(1, "in %s storage function", "hIST");
217 if (png_ptr == NULL || info_ptr == NULL)
220 if (info_ptr->num_palette == 0 || info_ptr->num_palette
221 > PNG_MAX_PALETTE_LENGTH)
224 "Invalid palette size, hIST allocation skipped");
229 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
231 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
234 info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr,
235 PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16))));
237 if (info_ptr->hist == NULL)
239 png_warning(png_ptr, "Insufficient memory for hIST chunk data");
244 info_ptr->free_me |= PNG_FREE_HIST;
246 for (i = 0; i < info_ptr->num_palette; i++)
247 info_ptr->hist[i] = hist[i];
249 info_ptr->valid |= PNG_INFO_hIST;
254 png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr,
255 png_uint_32 width, png_uint_32 height, int bit_depth,
256 int color_type, int interlace_type, int compression_type,
259 png_debug1(1, "in %s storage function", "IHDR");
261 if (png_ptr == NULL || info_ptr == NULL)
264 info_ptr->width = width;
265 info_ptr->height = height;
266 info_ptr->bit_depth = (png_byte)bit_depth;
267 info_ptr->color_type = (png_byte)color_type;
268 info_ptr->compression_type = (png_byte)compression_type;
269 info_ptr->filter_type = (png_byte)filter_type;
270 info_ptr->interlace_type = (png_byte)interlace_type;
272 png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
273 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
274 info_ptr->compression_type, info_ptr->filter_type);
276 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
277 info_ptr->channels = 1;
279 else if ((info_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
280 info_ptr->channels = 3;
283 info_ptr->channels = 1;
285 if ((info_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0)
286 info_ptr->channels++;
288 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
290 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
292 #ifdef PNG_APNG_SUPPORTED
293 /* for non-animated png. this may be overwritten from an acTL chunk later */
294 info_ptr->num_frames = 1;
298 #ifdef PNG_oFFs_SUPPORTED
300 png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr,
301 png_int_32 offset_x, png_int_32 offset_y, int unit_type)
303 png_debug1(1, "in %s storage function", "oFFs");
305 if (png_ptr == NULL || info_ptr == NULL)
308 info_ptr->x_offset = offset_x;
309 info_ptr->y_offset = offset_y;
310 info_ptr->offset_unit_type = (png_byte)unit_type;
311 info_ptr->valid |= PNG_INFO_oFFs;
315 #ifdef PNG_pCAL_SUPPORTED
317 png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
318 png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
319 int nparams, png_const_charp units, png_charpp params)
324 png_debug1(1, "in %s storage function", "pCAL");
326 if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL
327 || (nparams > 0 && params == NULL))
330 length = strlen(purpose) + 1;
331 png_debug1(3, "allocating purpose for info (%lu bytes)",
332 (unsigned long)length);
334 /* TODO: validate format of calibration name and unit name */
336 /* Check that the type matches the specification. */
337 if (type < 0 || type > 3)
339 png_chunk_report(png_ptr, "Invalid pCAL equation type",
340 PNG_CHUNK_WRITE_ERROR);
344 if (nparams < 0 || nparams > 255)
346 png_chunk_report(png_ptr, "Invalid pCAL parameter count",
347 PNG_CHUNK_WRITE_ERROR);
351 /* Validate params[nparams] */
352 for (i=0; i<nparams; ++i)
354 if (params[i] == NULL ||
355 !png_check_fp_string(params[i], strlen(params[i])))
357 png_chunk_report(png_ptr, "Invalid format for pCAL parameter",
358 PNG_CHUNK_WRITE_ERROR);
363 info_ptr->pcal_purpose = png_voidcast(png_charp,
364 png_malloc_warn(png_ptr, length));
366 if (info_ptr->pcal_purpose == NULL)
368 png_chunk_report(png_ptr, "Insufficient memory for pCAL purpose",
369 PNG_CHUNK_WRITE_ERROR);
373 memcpy(info_ptr->pcal_purpose, purpose, length);
375 png_debug(3, "storing X0, X1, type, and nparams in info");
376 info_ptr->pcal_X0 = X0;
377 info_ptr->pcal_X1 = X1;
378 info_ptr->pcal_type = (png_byte)type;
379 info_ptr->pcal_nparams = (png_byte)nparams;
381 length = strlen(units) + 1;
382 png_debug1(3, "allocating units for info (%lu bytes)",
383 (unsigned long)length);
385 info_ptr->pcal_units = png_voidcast(png_charp,
386 png_malloc_warn(png_ptr, length));
388 if (info_ptr->pcal_units == NULL)
390 png_warning(png_ptr, "Insufficient memory for pCAL units");
395 memcpy(info_ptr->pcal_units, units, length);
397 info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
398 (size_t)(((unsigned int)nparams + 1) * (sizeof (png_charp)))));
400 if (info_ptr->pcal_params == NULL)
402 png_warning(png_ptr, "Insufficient memory for pCAL params");
407 memset(info_ptr->pcal_params, 0, ((unsigned int)nparams + 1) *
408 (sizeof (png_charp)));
410 for (i = 0; i < nparams; i++)
412 length = strlen(params[i]) + 1;
413 png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
414 (unsigned long)length);
416 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
418 if (info_ptr->pcal_params[i] == NULL)
420 png_warning(png_ptr, "Insufficient memory for pCAL parameter");
425 memcpy(info_ptr->pcal_params[i], params[i], length);
428 info_ptr->valid |= PNG_INFO_pCAL;
429 info_ptr->free_me |= PNG_FREE_PCAL;
433 #ifdef PNG_sCAL_SUPPORTED
435 png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
436 int unit, png_const_charp swidth, png_const_charp sheight)
438 size_t lengthw = 0, lengthh = 0;
440 png_debug1(1, "in %s storage function", "sCAL");
442 if (png_ptr == NULL || info_ptr == NULL)
445 /* Double check the unit (should never get here with an invalid
446 * unit unless this is an API call.)
448 if (unit != 1 && unit != 2)
449 png_error(png_ptr, "Invalid sCAL unit");
451 if (swidth == NULL || (lengthw = strlen(swidth)) == 0 ||
452 swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
453 png_error(png_ptr, "Invalid sCAL width");
455 if (sheight == NULL || (lengthh = strlen(sheight)) == 0 ||
456 sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
457 png_error(png_ptr, "Invalid sCAL height");
459 info_ptr->scal_unit = (png_byte)unit;
463 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);
465 info_ptr->scal_s_width = png_voidcast(png_charp,
466 png_malloc_warn(png_ptr, lengthw));
468 if (info_ptr->scal_s_width == NULL)
470 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
475 memcpy(info_ptr->scal_s_width, swidth, lengthw);
479 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);
481 info_ptr->scal_s_height = png_voidcast(png_charp,
482 png_malloc_warn(png_ptr, lengthh));
484 if (info_ptr->scal_s_height == NULL)
486 png_free (png_ptr, info_ptr->scal_s_width);
487 info_ptr->scal_s_width = NULL;
489 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
494 memcpy(info_ptr->scal_s_height, sheight, lengthh);
496 info_ptr->valid |= PNG_INFO_sCAL;
497 info_ptr->free_me |= PNG_FREE_SCAL;
500 # ifdef PNG_FLOATING_POINT_SUPPORTED
502 png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
503 double width, double height)
505 png_debug1(1, "in %s storage function", "sCAL");
507 /* Check the arguments. */
509 png_warning(png_ptr, "Invalid sCAL width ignored");
511 else if (height <= 0)
512 png_warning(png_ptr, "Invalid sCAL height ignored");
516 /* Convert 'width' and 'height' to ASCII. */
517 char swidth[PNG_sCAL_MAX_DIGITS+1];
518 char sheight[PNG_sCAL_MAX_DIGITS+1];
520 png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width,
522 png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height,
525 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
530 # ifdef PNG_FIXED_POINT_SUPPORTED
532 png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
533 png_fixed_point width, png_fixed_point height)
535 png_debug1(1, "in %s storage function", "sCAL");
537 /* Check the arguments. */
539 png_warning(png_ptr, "Invalid sCAL width ignored");
541 else if (height <= 0)
542 png_warning(png_ptr, "Invalid sCAL height ignored");
546 /* Convert 'width' and 'height' to ASCII. */
547 char swidth[PNG_sCAL_MAX_DIGITS+1];
548 char sheight[PNG_sCAL_MAX_DIGITS+1];
550 png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width);
551 png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height);
553 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
559 #ifdef PNG_pHYs_SUPPORTED
561 png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr,
562 png_uint_32 res_x, png_uint_32 res_y, int unit_type)
564 png_debug1(1, "in %s storage function", "pHYs");
566 if (png_ptr == NULL || info_ptr == NULL)
569 info_ptr->x_pixels_per_unit = res_x;
570 info_ptr->y_pixels_per_unit = res_y;
571 info_ptr->phys_unit_type = (png_byte)unit_type;
572 info_ptr->valid |= PNG_INFO_pHYs;
577 png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
578 png_const_colorp palette, int num_palette)
581 png_uint_32 max_palette_length;
583 png_debug1(1, "in %s storage function", "PLTE");
585 if (png_ptr == NULL || info_ptr == NULL)
588 max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
589 (1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
591 if (num_palette < 0 || num_palette > (int) max_palette_length)
593 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
594 png_error(png_ptr, "Invalid palette length");
598 png_warning(png_ptr, "Invalid palette length");
604 if ((num_palette > 0 && palette == NULL) ||
606 # ifdef PNG_MNG_FEATURES_SUPPORTED
607 && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
611 png_error(png_ptr, "Invalid palette");
614 /* It may not actually be necessary to set png_ptr->palette here;
615 * we do it for backward compatibility with the way the png_handle_tRNS
616 * function used to do the allocation.
618 * 1.6.0: the above statement appears to be incorrect; something has to set
619 * the palette inside png_struct on read.
621 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
623 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
624 * of num_palette entries, in case of an invalid PNG file or incorrect
625 * call to png_set_PLTE() with too-large sample values.
627 png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
628 PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
631 memcpy(png_ptr->palette, palette, (unsigned int)num_palette *
632 (sizeof (png_color)));
633 info_ptr->palette = png_ptr->palette;
634 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
636 info_ptr->free_me |= PNG_FREE_PLTE;
638 info_ptr->valid |= PNG_INFO_PLTE;
641 #ifdef PNG_sBIT_SUPPORTED
643 png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
644 png_const_color_8p sig_bit)
646 png_debug1(1, "in %s storage function", "sBIT");
648 if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL)
651 info_ptr->sig_bit = *sig_bit;
652 info_ptr->valid |= PNG_INFO_sBIT;
656 #ifdef PNG_sRGB_SUPPORTED
658 png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
660 png_debug1(1, "in %s storage function", "sRGB");
662 if (png_ptr == NULL || info_ptr == NULL)
665 (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent);
666 png_colorspace_sync_info(png_ptr, info_ptr);
670 png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
673 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
675 if (png_ptr == NULL || info_ptr == NULL)
678 if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace,
681 /* This causes the gAMA and cHRM to be written too */
682 info_ptr->colorspace.flags |=
683 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
686 png_colorspace_sync_info(png_ptr, info_ptr);
691 #ifdef PNG_iCCP_SUPPORTED
693 png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
694 png_const_charp name, int compression_type,
695 png_const_bytep profile, png_uint_32 proflen)
697 png_charp new_iccp_name;
698 png_bytep new_iccp_profile;
701 png_debug1(1, "in %s storage function", "iCCP");
703 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
706 if (compression_type != PNG_COMPRESSION_TYPE_BASE)
707 png_app_error(png_ptr, "Invalid iCCP compression method");
709 /* Set the colorspace first because this validates the profile; do not
710 * override previously set app cHRM or gAMA here (because likely as not the
711 * application knows better than libpng what the correct values are.) Pass
712 * the info_ptr color_type field to png_colorspace_set_ICC because in the
713 * write case it has not yet been stored in png_ptr.
716 int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,
717 proflen, profile, info_ptr->color_type);
719 png_colorspace_sync_info(png_ptr, info_ptr);
721 /* Don't do any of the copying if the profile was bad, or inconsistent. */
725 /* But do write the gAMA and cHRM chunks from the profile. */
726 info_ptr->colorspace.flags |=
727 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
730 length = strlen(name)+1;
731 new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));
733 if (new_iccp_name == NULL)
735 png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");
740 memcpy(new_iccp_name, name, length);
741 new_iccp_profile = png_voidcast(png_bytep,
742 png_malloc_warn(png_ptr, proflen));
744 if (new_iccp_profile == NULL)
746 png_free(png_ptr, new_iccp_name);
747 png_benign_error(png_ptr,
748 "Insufficient memory to process iCCP profile");
753 memcpy(new_iccp_profile, profile, proflen);
755 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
757 info_ptr->iccp_proflen = proflen;
758 info_ptr->iccp_name = new_iccp_name;
759 info_ptr->iccp_profile = new_iccp_profile;
760 info_ptr->free_me |= PNG_FREE_ICCP;
761 info_ptr->valid |= PNG_INFO_iCCP;
765 #ifdef PNG_TEXT_SUPPORTED
767 png_set_text(png_const_structrp png_ptr, png_inforp info_ptr,
768 png_const_textp text_ptr, int num_text)
771 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
774 png_error(png_ptr, "Insufficient memory to store text");
778 png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,
779 png_const_textp text_ptr, int num_text)
783 png_debug1(1, "in %lx storage function", png_ptr == NULL ? 0xabadca11U :
784 (unsigned long)png_ptr->chunk_name);
786 if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL)
789 /* Make sure we have enough space in the "text" array in info_struct
790 * to hold all of the incoming text_ptr objects. This compare can't overflow
791 * because max_text >= num_text (anyway, subtract of two positive integers
792 * can't overflow in any case.)
794 if (num_text > info_ptr->max_text - info_ptr->num_text)
796 int old_num_text = info_ptr->num_text;
798 png_textp new_text = NULL;
800 /* Calculate an appropriate max_text, checking for overflow. */
801 max_text = old_num_text;
802 if (num_text <= INT_MAX - max_text)
804 max_text += num_text;
806 /* Round up to a multiple of 8 */
807 if (max_text < INT_MAX-8)
808 max_text = (max_text + 8) & ~0x7;
813 /* Now allocate a new array and copy the old members in; this does all
814 * the overflow checks.
816 new_text = png_voidcast(png_textp,png_realloc_array(png_ptr,
817 info_ptr->text, old_num_text, max_text-old_num_text,
821 if (new_text == NULL)
823 png_chunk_report(png_ptr, "too many text chunks",
824 PNG_CHUNK_WRITE_ERROR);
829 png_free(png_ptr, info_ptr->text);
831 info_ptr->text = new_text;
832 info_ptr->free_me |= PNG_FREE_TEXT;
833 info_ptr->max_text = max_text;
834 /* num_text is adjusted below as the entries are copied in */
836 png_debug1(3, "allocated %d entries for info_ptr->text", max_text);
839 for (i = 0; i < num_text; i++)
841 size_t text_length, key_len;
842 size_t lang_len, lang_key_len;
843 png_textp textp = &(info_ptr->text[info_ptr->num_text]);
845 if (text_ptr[i].key == NULL)
848 if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
849 text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
851 png_chunk_report(png_ptr, "text compression mode is out of range",
852 PNG_CHUNK_WRITE_ERROR);
856 key_len = strlen(text_ptr[i].key);
858 if (text_ptr[i].compression <= 0)
865 # ifdef PNG_iTXt_SUPPORTED
869 if (text_ptr[i].lang != NULL)
870 lang_len = strlen(text_ptr[i].lang);
875 if (text_ptr[i].lang_key != NULL)
876 lang_key_len = strlen(text_ptr[i].lang_key);
883 png_chunk_report(png_ptr, "iTXt chunk not supported",
884 PNG_CHUNK_WRITE_ERROR);
889 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
892 # ifdef PNG_iTXt_SUPPORTED
893 if (text_ptr[i].compression > 0)
894 textp->compression = PNG_ITXT_COMPRESSION_NONE;
898 textp->compression = PNG_TEXT_COMPRESSION_NONE;
903 text_length = strlen(text_ptr[i].text);
904 textp->compression = text_ptr[i].compression;
907 textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr,
908 key_len + text_length + lang_len + lang_key_len + 4));
910 if (textp->key == NULL)
912 png_chunk_report(png_ptr, "text chunk: out of memory",
913 PNG_CHUNK_WRITE_ERROR);
918 png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
919 (unsigned long)(png_uint_32)
920 (key_len + lang_len + lang_key_len + text_length + 4),
923 memcpy(textp->key, text_ptr[i].key, key_len);
924 *(textp->key + key_len) = '\0';
926 if (text_ptr[i].compression > 0)
928 textp->lang = textp->key + key_len + 1;
929 memcpy(textp->lang, text_ptr[i].lang, lang_len);
930 *(textp->lang + lang_len) = '\0';
931 textp->lang_key = textp->lang + lang_len + 1;
932 memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
933 *(textp->lang_key + lang_key_len) = '\0';
934 textp->text = textp->lang_key + lang_key_len + 1;
940 textp->lang_key=NULL;
941 textp->text = textp->key + key_len + 1;
944 if (text_length != 0)
945 memcpy(textp->text, text_ptr[i].text, text_length);
947 *(textp->text + text_length) = '\0';
949 # ifdef PNG_iTXt_SUPPORTED
950 if (textp->compression > 0)
952 textp->text_length = 0;
953 textp->itxt_length = text_length;
959 textp->text_length = text_length;
960 textp->itxt_length = 0;
963 info_ptr->num_text++;
964 png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
971 #ifdef PNG_tIME_SUPPORTED
973 png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
974 png_const_timep mod_time)
976 png_debug1(1, "in %s storage function", "tIME");
978 if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL ||
979 (png_ptr->mode & PNG_WROTE_tIME) != 0)
982 if (mod_time->month == 0 || mod_time->month > 12 ||
983 mod_time->day == 0 || mod_time->day > 31 ||
984 mod_time->hour > 23 || mod_time->minute > 59 ||
985 mod_time->second > 60)
987 png_warning(png_ptr, "Ignoring invalid time value");
992 info_ptr->mod_time = *mod_time;
993 info_ptr->valid |= PNG_INFO_tIME;
997 #ifdef PNG_tRNS_SUPPORTED
999 png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,
1000 png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
1002 png_debug1(1, "in %s storage function", "tRNS");
1004 if (png_ptr == NULL || info_ptr == NULL)
1008 if (trans_alpha != NULL)
1010 /* It may not actually be necessary to set png_ptr->trans_alpha here;
1011 * we do it for backward compatibility with the way the png_handle_tRNS
1012 * function used to do the allocation.
1014 * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively
1015 * relies on png_set_tRNS storing the information in png_struct
1016 * (otherwise it won't be there for the code in pngrtran.c).
1019 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
1021 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
1023 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
1024 info_ptr->trans_alpha = png_voidcast(png_bytep,
1025 png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
1026 memcpy(info_ptr->trans_alpha, trans_alpha, (size_t)num_trans);
1028 info_ptr->valid |= PNG_INFO_tRNS;
1029 info_ptr->free_me |= PNG_FREE_TRNS;
1031 png_ptr->trans_alpha = info_ptr->trans_alpha;
1034 if (trans_color != NULL)
1036 #ifdef PNG_WARNINGS_SUPPORTED
1037 if (info_ptr->bit_depth < 16)
1039 int sample_max = (1 << info_ptr->bit_depth) - 1;
1041 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
1042 trans_color->gray > sample_max) ||
1043 (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
1044 (trans_color->red > sample_max ||
1045 trans_color->green > sample_max ||
1046 trans_color->blue > sample_max)))
1047 png_warning(png_ptr,
1048 "tRNS chunk has out-of-range samples for bit_depth");
1052 info_ptr->trans_color = *trans_color;
1058 info_ptr->num_trans = (png_uint_16)num_trans;
1062 info_ptr->valid |= PNG_INFO_tRNS;
1063 info_ptr->free_me |= PNG_FREE_TRNS;
1068 #ifdef PNG_sPLT_SUPPORTED
1070 png_set_sPLT(png_const_structrp png_ptr,
1071 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)
1073 * entries - array of png_sPLT_t structures
1074 * to be added to the list of palettes
1075 * in the info structure.
1077 * nentries - number of palette structures to be
1083 if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL)
1086 /* Use the internal realloc function, which checks for all the possible
1087 * overflows. Notice that the parameters are (int) and (size_t)
1089 np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr,
1090 info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries,
1095 /* Out of memory or too many chunks */
1096 png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR);
1101 png_free(png_ptr, info_ptr->splt_palettes);
1102 info_ptr->splt_palettes = np;
1103 info_ptr->free_me |= PNG_FREE_SPLT;
1105 np += info_ptr->splt_palettes_num;
1111 /* Skip invalid input entries */
1112 if (entries->name == NULL || entries->entries == NULL)
1114 /* png_handle_sPLT doesn't do this, so this is an app error */
1115 png_app_error(png_ptr, "png_set_sPLT: invalid sPLT");
1116 /* Just skip the invalid entry */
1120 np->depth = entries->depth;
1122 /* In the event of out-of-memory just return - there's no point keeping
1123 * on trying to add sPLT chunks.
1125 length = strlen(entries->name) + 1;
1126 np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length));
1128 if (np->name == NULL)
1131 memcpy(np->name, entries->name, length);
1133 /* IMPORTANT: we have memory now that won't get freed if something else
1134 * goes wrong; this code must free it. png_malloc_array produces no
1135 * warnings; use a png_chunk_report (below) if there is an error.
1137 np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr,
1138 entries->nentries, sizeof (png_sPLT_entry)));
1140 if (np->entries == NULL)
1142 png_free(png_ptr, np->name);
1147 np->nentries = entries->nentries;
1148 /* This multiply can't overflow because png_malloc_array has already
1149 * checked it when doing the allocation.
1151 memcpy(np->entries, entries->entries,
1152 (unsigned int)entries->nentries * sizeof (png_sPLT_entry));
1154 /* Note that 'continue' skips the advance of the out pointer and out
1155 * count, so an invalid entry is not added.
1157 info_ptr->valid |= PNG_INFO_sPLT;
1158 ++(info_ptr->splt_palettes_num);
1165 png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
1169 #ifdef PNG_APNG_SUPPORTED
1171 png_set_acTL(png_structp png_ptr, png_infop info_ptr,
1172 png_uint_32 num_frames, png_uint_32 num_plays)
1174 png_debug1(1, "in %s storage function", "acTL");
1176 if (png_ptr == NULL || info_ptr == NULL)
1178 png_warning(png_ptr,
1179 "Call to png_set_acTL() with NULL png_ptr "
1180 "or info_ptr ignored");
1183 if (num_frames == 0)
1185 png_warning(png_ptr,
1186 "Ignoring attempt to set acTL with num_frames zero");
1189 if (num_frames > PNG_UINT_31_MAX)
1191 png_warning(png_ptr,
1192 "Ignoring attempt to set acTL with num_frames > 2^31-1");
1195 if (num_plays > PNG_UINT_31_MAX)
1197 png_warning(png_ptr,
1198 "Ignoring attempt to set acTL with num_plays "
1203 info_ptr->num_frames = num_frames;
1204 info_ptr->num_plays = num_plays;
1206 info_ptr->valid |= PNG_INFO_acTL;
1211 /* delay_num and delay_den can hold any 16-bit values including zero */
1213 png_set_next_frame_fcTL(png_structp png_ptr, png_infop info_ptr,
1214 png_uint_32 width, png_uint_32 height,
1215 png_uint_32 x_offset, png_uint_32 y_offset,
1216 png_uint_16 delay_num, png_uint_16 delay_den,
1217 png_byte dispose_op, png_byte blend_op)
1219 png_debug1(1, "in %s storage function", "fcTL");
1221 if (png_ptr == NULL || info_ptr == NULL)
1223 png_warning(png_ptr,
1224 "Call to png_set_fcTL() with NULL png_ptr or info_ptr "
1229 png_ensure_fcTL_is_valid(png_ptr, width, height, x_offset, y_offset,
1230 delay_num, delay_den, dispose_op, blend_op);
1232 if (blend_op == PNG_BLEND_OP_OVER)
1234 if (!(png_ptr->color_type & PNG_COLOR_MASK_ALPHA) &&
1235 !(png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
1237 png_warning(png_ptr, "PNG_BLEND_OP_OVER is meaningless "
1238 "and wasteful for opaque images, ignored");
1239 blend_op = PNG_BLEND_OP_SOURCE;
1243 info_ptr->next_frame_width = width;
1244 info_ptr->next_frame_height = height;
1245 info_ptr->next_frame_x_offset = x_offset;
1246 info_ptr->next_frame_y_offset = y_offset;
1247 info_ptr->next_frame_delay_num = delay_num;
1248 info_ptr->next_frame_delay_den = delay_den;
1249 info_ptr->next_frame_dispose_op = dispose_op;
1250 info_ptr->next_frame_blend_op = blend_op;
1252 info_ptr->valid |= PNG_INFO_fcTL;
1258 png_ensure_fcTL_is_valid(png_structp png_ptr,
1259 png_uint_32 width, png_uint_32 height,
1260 png_uint_32 x_offset, png_uint_32 y_offset,
1261 png_uint_16 delay_num, png_uint_16 delay_den,
1262 png_byte dispose_op, png_byte blend_op)
1264 if (width == 0 || width > PNG_UINT_31_MAX)
1265 png_error(png_ptr, "invalid width in fcTL (> 2^31-1)");
1266 if (height == 0 || height > PNG_UINT_31_MAX)
1267 png_error(png_ptr, "invalid height in fcTL (> 2^31-1)");
1268 if (x_offset > PNG_UINT_31_MAX)
1269 png_error(png_ptr, "invalid x_offset in fcTL (> 2^31-1)");
1270 if (y_offset > PNG_UINT_31_MAX)
1271 png_error(png_ptr, "invalid y_offset in fcTL (> 2^31-1)");
1272 if (width + x_offset > png_ptr->first_frame_width ||
1273 height + y_offset > png_ptr->first_frame_height)
1274 png_error(png_ptr, "dimensions of a frame are greater than"
1275 "the ones in IHDR");
1277 if (dispose_op != PNG_DISPOSE_OP_NONE &&
1278 dispose_op != PNG_DISPOSE_OP_BACKGROUND &&
1279 dispose_op != PNG_DISPOSE_OP_PREVIOUS)
1280 png_error(png_ptr, "invalid dispose_op in fcTL");
1282 if (blend_op != PNG_BLEND_OP_SOURCE &&
1283 blend_op != PNG_BLEND_OP_OVER)
1284 png_error(png_ptr, "invalid blend_op in fcTL");
1286 PNG_UNUSED(delay_num)
1287 PNG_UNUSED(delay_den)
1291 png_set_first_frame_is_hidden(png_structp png_ptr, png_infop info_ptr,
1294 png_debug(1, "in png_first_frame_is_hidden()");
1296 if (png_ptr == NULL)
1300 png_ptr->apng_flags |= PNG_FIRST_FRAME_HIDDEN;
1302 png_ptr->apng_flags &= ~PNG_FIRST_FRAME_HIDDEN;
1304 PNG_UNUSED(info_ptr)
1308 #endif /* PNG_APNG_SUPPORTED */
1310 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1312 check_location(png_const_structrp png_ptr, int location)
1314 location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);
1316 /* New in 1.6.0; copy the location and check it. This is an API
1317 * change; previously the app had to use the
1318 * png_set_unknown_chunk_location API below for each chunk.
1320 if (location == 0 && (png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1322 /* Write struct, so unknown chunks come from the app */
1323 png_app_warning(png_ptr,
1324 "png_set_unknown_chunks now expects a valid location");
1325 /* Use the old behavior */
1326 location = (png_byte)(png_ptr->mode &
1327 (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT));
1330 /* This need not be an internal error - if the app calls
1331 * png_set_unknown_chunks on a read pointer it must get the location right.
1334 png_error(png_ptr, "invalid location in png_set_unknown_chunks");
1336 /* Now reduce the location to the top-most set bit by removing each least
1337 * significant bit in turn.
1339 while (location != (location & -location))
1340 location &= ~(location & -location);
1342 /* The cast is safe because 'location' is a bit mask and only the low four
1343 * bits are significant.
1345 return (png_byte)location;
1349 png_set_unknown_chunks(png_const_structrp png_ptr,
1350 png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
1352 png_unknown_chunkp np;
1354 if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 ||
1358 /* Check for the failure cases where support has been disabled at compile
1359 * time. This code is hardly ever compiled - it's here because
1360 * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this
1361 * code) but may be meaningless if the read or write handling of unknown
1362 * chunks is not compiled in.
1364 # if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \
1365 defined(PNG_READ_SUPPORTED)
1366 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1368 png_app_error(png_ptr, "no unknown chunk support on read");
1373 # if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \
1374 defined(PNG_WRITE_SUPPORTED)
1375 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1377 png_app_error(png_ptr, "no unknown chunk support on write");
1383 /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that
1384 * unknown critical chunks could be lost with just a warning resulting in
1385 * undefined behavior. Now png_chunk_report is used to provide behavior
1386 * appropriate to read or write.
1388 np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr,
1389 info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns,
1394 png_chunk_report(png_ptr, "too many unknown chunks",
1395 PNG_CHUNK_WRITE_ERROR);
1400 png_free(png_ptr, info_ptr->unknown_chunks);
1401 info_ptr->unknown_chunks = np; /* safe because it is initialized */
1402 info_ptr->free_me |= PNG_FREE_UNKN;
1404 np += info_ptr->unknown_chunks_num;
1406 /* Increment unknown_chunks_num each time round the loop to protect the
1407 * just-allocated chunk data.
1409 for (; num_unknowns > 0; --num_unknowns, ++unknowns)
1411 memcpy(np->name, unknowns->name, (sizeof np->name));
1412 np->name[(sizeof np->name)-1] = '\0';
1413 np->location = check_location(png_ptr, unknowns->location);
1415 if (unknowns->size == 0)
1423 np->data = png_voidcast(png_bytep,
1424 png_malloc_base(png_ptr, unknowns->size));
1426 if (np->data == NULL)
1428 png_chunk_report(png_ptr, "unknown chunk: out of memory",
1429 PNG_CHUNK_WRITE_ERROR);
1430 /* But just skip storing the unknown chunk */
1434 memcpy(np->data, unknowns->data, unknowns->size);
1435 np->size = unknowns->size;
1438 /* These increments are skipped on out-of-memory for the data - the
1439 * unknown chunk entry gets overwritten if the png_chunk_report returns.
1440 * This is correct in the read case (the chunk is just dropped.)
1443 ++(info_ptr->unknown_chunks_num);
1448 png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
1449 int chunk, int location)
1451 /* This API is pretty pointless in 1.6.0 because the location can be set
1452 * before the call to png_set_unknown_chunks.
1454 * TODO: add a png_app_warning in 1.7
1456 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&
1457 chunk < info_ptr->unknown_chunks_num)
1459 if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)
1461 png_app_error(png_ptr, "invalid unknown chunk location");
1462 /* Fake out the pre 1.6.0 behavior: */
1463 if (((unsigned int)location & PNG_HAVE_IDAT) != 0) /* undocumented! */
1464 location = PNG_AFTER_IDAT;
1467 location = PNG_HAVE_IHDR; /* also undocumented */
1470 info_ptr->unknown_chunks[chunk].location =
1471 check_location(png_ptr, location);
1474 #endif /* STORE_UNKNOWN_CHUNKS */
1476 #ifdef PNG_MNG_FEATURES_SUPPORTED
1478 png_permit_mng_features(png_structrp png_ptr, png_uint_32 mng_features)
1480 png_debug(1, "in png_permit_mng_features");
1482 if (png_ptr == NULL)
1485 png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES;
1487 return png_ptr->mng_features_permitted;
1491 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1493 add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep)
1497 /* Utility function: update the 'keep' state of a chunk if it is already in
1498 * the list, otherwise add it to the list.
1500 for (i=0; i<count; ++i, list += 5)
1502 if (memcmp(list, add, 4) == 0)
1504 list[4] = (png_byte)keep;
1510 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
1513 memcpy(list, add, 4);
1514 list[4] = (png_byte)keep;
1521 png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
1522 png_const_bytep chunk_list, int num_chunks_in)
1525 unsigned int num_chunks, old_num_chunks;
1527 if (png_ptr == NULL)
1530 if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)
1532 png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");
1537 if (num_chunks_in <= 0)
1539 png_ptr->unknown_default = keep;
1541 /* '0' means just set the flags, so stop here */
1542 if (num_chunks_in == 0)
1546 if (num_chunks_in < 0)
1548 /* Ignore all unknown chunks and all chunks recognized by
1549 * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
1551 static const png_byte chunks_to_ignore[] = {
1552 98, 75, 71, 68, '\0', /* bKGD */
1553 99, 72, 82, 77, '\0', /* cHRM */
1554 101, 88, 73, 102, '\0', /* eXIf */
1555 103, 65, 77, 65, '\0', /* gAMA */
1556 104, 73, 83, 84, '\0', /* hIST */
1557 105, 67, 67, 80, '\0', /* iCCP */
1558 105, 84, 88, 116, '\0', /* iTXt */
1559 111, 70, 70, 115, '\0', /* oFFs */
1560 112, 67, 65, 76, '\0', /* pCAL */
1561 112, 72, 89, 115, '\0', /* pHYs */
1562 115, 66, 73, 84, '\0', /* sBIT */
1563 115, 67, 65, 76, '\0', /* sCAL */
1564 115, 80, 76, 84, '\0', /* sPLT */
1565 115, 84, 69, 82, '\0', /* sTER */
1566 115, 82, 71, 66, '\0', /* sRGB */
1567 116, 69, 88, 116, '\0', /* tEXt */
1568 116, 73, 77, 69, '\0', /* tIME */
1569 122, 84, 88, 116, '\0' /* zTXt */
1572 chunk_list = chunks_to_ignore;
1573 num_chunks = (unsigned int)/*SAFE*/(sizeof chunks_to_ignore)/5U;
1576 else /* num_chunks_in > 0 */
1578 if (chunk_list == NULL)
1580 /* Prior to 1.6.0 this was silently ignored, now it is an app_error
1581 * which can be switched off.
1583 png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");
1588 num_chunks = (unsigned int)num_chunks_in;
1591 old_num_chunks = png_ptr->num_chunk_list;
1592 if (png_ptr->chunk_list == NULL)
1595 /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow.
1597 if (num_chunks + old_num_chunks > UINT_MAX/5)
1599 png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");
1604 /* If these chunks are being reset to the default then no more memory is
1605 * required because add_one_chunk above doesn't extend the list if the 'keep'
1606 * parameter is the default.
1610 new_list = png_voidcast(png_bytep, png_malloc(png_ptr,
1611 5 * (num_chunks + old_num_chunks)));
1613 if (old_num_chunks > 0)
1614 memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
1617 else if (old_num_chunks > 0)
1618 new_list = png_ptr->chunk_list;
1623 /* Add the new chunks together with each one's handling code. If the chunk
1624 * already exists the code is updated, otherwise the chunk is added to the
1625 * end. (In libpng 1.6.0 order no longer matters because this code enforces
1626 * the earlier convention that the last setting is the one that is used.)
1628 if (new_list != NULL)
1630 png_const_bytep inlist;
1634 for (i=0; i<num_chunks; ++i)
1636 old_num_chunks = add_one_chunk(new_list, old_num_chunks,
1637 chunk_list+5*i, keep);
1640 /* Now remove any spurious 'default' entries. */
1642 for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5)
1646 if (outlist != inlist)
1647 memcpy(outlist, inlist, 5);
1653 /* This means the application has removed all the specialized handling. */
1654 if (num_chunks == 0)
1656 if (png_ptr->chunk_list != new_list)
1657 png_free(png_ptr, new_list);
1666 png_ptr->num_chunk_list = num_chunks;
1668 if (png_ptr->chunk_list != new_list)
1670 if (png_ptr->chunk_list != NULL)
1671 png_free(png_ptr, png_ptr->chunk_list);
1673 png_ptr->chunk_list = new_list;
1678 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1680 png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr,
1681 png_user_chunk_ptr read_user_chunk_fn)
1683 png_debug(1, "in png_set_read_user_chunk_fn");
1685 if (png_ptr == NULL)
1688 png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1689 png_ptr->user_chunk_ptr = user_chunk_ptr;
1693 #ifdef PNG_INFO_IMAGE_SUPPORTED
1695 png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr,
1696 png_bytepp row_pointers)
1698 png_debug1(1, "in %s storage function", "rows");
1700 if (png_ptr == NULL || info_ptr == NULL)
1703 if (info_ptr->row_pointers != NULL &&
1704 (info_ptr->row_pointers != row_pointers))
1705 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1707 info_ptr->row_pointers = row_pointers;
1709 if (row_pointers != NULL)
1710 info_ptr->valid |= PNG_INFO_IDAT;
1715 png_set_compression_buffer_size(png_structrp png_ptr, size_t size)
1717 if (png_ptr == NULL)
1720 if (size == 0 || size > PNG_UINT_31_MAX)
1721 png_error(png_ptr, "invalid compression buffer size");
1723 # ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1724 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1726 png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */
1731 # ifdef PNG_WRITE_SUPPORTED
1732 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1734 if (png_ptr->zowner != 0)
1736 png_warning(png_ptr,
1737 "Compression buffer size cannot be changed because it is in use");
1742 #ifndef __COVERITY__
1743 /* Some compilers complain that this is always false. However, it
1744 * can be true when integer overflow happens.
1746 if (size > ZLIB_IO_MAX)
1748 png_warning(png_ptr,
1749 "Compression buffer size limited to system maximum");
1750 size = ZLIB_IO_MAX; /* must fit */
1756 /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH
1757 * if this is permitted.
1759 png_warning(png_ptr,
1760 "Compression buffer size cannot be reduced below 6");
1765 if (png_ptr->zbuffer_size != size)
1767 png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
1768 png_ptr->zbuffer_size = (uInt)size;
1775 png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)
1777 if (png_ptr != NULL && info_ptr != NULL)
1778 info_ptr->valid &= (unsigned int)(~mask);
1782 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1783 /* This function was added to libpng 1.2.6 */
1785 png_set_user_limits(png_structrp png_ptr, png_uint_32 user_width_max,
1786 png_uint_32 user_height_max)
1788 /* Images with dimensions larger than these limits will be
1789 * rejected by png_set_IHDR(). To accept any PNG datastream
1790 * regardless of dimensions, set both limits to 0x7fffffff.
1792 if (png_ptr == NULL)
1795 png_ptr->user_width_max = user_width_max;
1796 png_ptr->user_height_max = user_height_max;
1799 /* This function was added to libpng 1.4.0 */
1801 png_set_chunk_cache_max(png_structrp png_ptr, png_uint_32 user_chunk_cache_max)
1803 if (png_ptr != NULL)
1804 png_ptr->user_chunk_cache_max = user_chunk_cache_max;
1807 /* This function was added to libpng 1.4.1 */
1809 png_set_chunk_malloc_max(png_structrp png_ptr,
1810 png_alloc_size_t user_chunk_malloc_max)
1812 if (png_ptr != NULL)
1813 png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
1815 #endif /* ?SET_USER_LIMITS */
1818 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
1820 png_set_benign_errors(png_structrp png_ptr, int allowed)
1822 png_debug(1, "in png_set_benign_errors");
1824 /* If allowed is 1, png_benign_error() is treated as a warning.
1826 * If allowed is 0, png_benign_error() is treated as an error (which
1827 * is the default behavior if png_set_benign_errors() is not called).
1831 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN |
1832 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN;
1835 png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN |
1836 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN);
1838 #endif /* BENIGN_ERRORS */
1840 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
1841 /* Whether to report invalid palette index; added at libng-1.5.10.
1842 * It is possible for an indexed (color-type==3) PNG file to contain
1843 * pixels with invalid (out-of-range) indexes if the PLTE chunk has
1844 * fewer entries than the image's bit-depth would allow. We recover
1845 * from this gracefully by filling any incomplete palette with zeros
1846 * (opaque black). By default, when this occurs libpng will issue
1847 * a benign error. This API can be used to override that behavior.
1850 png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)
1852 png_debug(1, "in png_set_check_for_invalid_index");
1855 png_ptr->num_palette_max = 0;
1858 png_ptr->num_palette_max = -1;
1862 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) || \
1863 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
1864 /* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
1865 * and if invalid, correct the keyword rather than discarding the entire
1866 * chunk. The PNG 1.0 specification requires keywords 1-79 characters in
1867 * length, forbids leading or trailing whitespace, multiple internal spaces,
1868 * and the non-break space (0x80) from ISO 8859-1. Returns keyword length.
1870 * The 'new_key' buffer must be 80 characters in size (for the keyword plus a
1871 * trailing '\0'). If this routine returns 0 then there was no keyword, or a
1872 * valid one could not be generated, and the caller must png_error.
1874 png_uint_32 /* PRIVATE */
1875 png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key)
1877 #ifdef PNG_WARNINGS_SUPPORTED
1878 png_const_charp orig_key = key;
1880 png_uint_32 key_len = 0;
1881 int bad_character = 0;
1884 png_debug(1, "in png_check_keyword");
1892 while (*key && key_len < 79)
1894 png_byte ch = (png_byte)*key++;
1896 if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/))
1898 *new_key++ = ch; ++key_len; space = 0;
1901 else if (space == 0)
1903 /* A space or an invalid character when one wasn't seen immediately
1904 * before; output just a space.
1906 *new_key++ = 32; ++key_len; space = 1;
1908 /* If the character was not a space then it is invalid. */
1913 else if (bad_character == 0)
1914 bad_character = ch; /* just skip it, record the first error */
1917 if (key_len > 0 && space != 0) /* trailing space */
1919 --key_len; --new_key;
1920 if (bad_character == 0)
1924 /* Terminate the keyword */
1930 #ifdef PNG_WARNINGS_SUPPORTED
1931 /* Try to only output one warning per keyword: */
1932 if (*key != 0) /* keyword too long */
1933 png_warning(png_ptr, "keyword truncated");
1935 else if (bad_character != 0)
1937 PNG_WARNING_PARAMETERS(p)
1939 png_warning_parameter(p, 1, orig_key);
1940 png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character);
1942 png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'");
1944 #else /* !WARNINGS */
1946 #endif /* !WARNINGS */
1950 #endif /* TEXT || pCAL || iCCP || sPLT */
1951 #endif /* READ || WRITE */