2 /* pngset.c - storage of image information into info struct
4 * Last changed in libpng 1.4.1 [February 25, 2010]
5 * Copyright (c) 1998-2010 Glenn Randers-Pehrson
6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
7 * (Version 0.88 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.
19 #define PNG_NO_PEDANTIC_WARNINGS
21 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
24 #ifdef PNG_bKGD_SUPPORTED
26 png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
28 png_debug1(1, "in %s storage function", "bKGD");
30 if (png_ptr == NULL || info_ptr == NULL)
33 png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16));
34 info_ptr->valid |= PNG_INFO_bKGD;
38 #ifdef PNG_cHRM_SUPPORTED
39 #ifdef PNG_FLOATING_POINT_SUPPORTED
41 png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
42 double white_x, double white_y, double red_x, double red_y,
43 double green_x, double green_y, double blue_x, double blue_y)
45 png_debug1(1, "in %s storage function", "cHRM");
47 if (png_ptr == NULL || info_ptr == NULL)
50 info_ptr->x_white = (float)white_x;
51 info_ptr->y_white = (float)white_y;
52 info_ptr->x_red = (float)red_x;
53 info_ptr->y_red = (float)red_y;
54 info_ptr->x_green = (float)green_x;
55 info_ptr->y_green = (float)green_y;
56 info_ptr->x_blue = (float)blue_x;
57 info_ptr->y_blue = (float)blue_y;
58 #ifdef PNG_FIXED_POINT_SUPPORTED
59 info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
60 info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
61 info_ptr->int_x_red = (png_fixed_point)( red_x*100000.+0.5);
62 info_ptr->int_y_red = (png_fixed_point)( red_y*100000.+0.5);
63 info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
64 info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
65 info_ptr->int_x_blue = (png_fixed_point)( blue_x*100000.+0.5);
66 info_ptr->int_y_blue = (png_fixed_point)( blue_y*100000.+0.5);
68 info_ptr->valid |= PNG_INFO_cHRM;
70 #endif /* PNG_FLOATING_POINT_SUPPORTED */
72 #ifdef PNG_FIXED_POINT_SUPPORTED
74 png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
75 png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
76 png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
77 png_fixed_point blue_x, png_fixed_point blue_y)
79 png_debug1(1, "in %s storage function", "cHRM fixed");
81 if (png_ptr == NULL || info_ptr == NULL)
84 #ifdef PNG_CHECK_cHRM_SUPPORTED
85 if (png_check_cHRM_fixed(png_ptr,
86 white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y))
89 info_ptr->int_x_white = white_x;
90 info_ptr->int_y_white = white_y;
91 info_ptr->int_x_red = red_x;
92 info_ptr->int_y_red = red_y;
93 info_ptr->int_x_green = green_x;
94 info_ptr->int_y_green = green_y;
95 info_ptr->int_x_blue = blue_x;
96 info_ptr->int_y_blue = blue_y;
97 #ifdef PNG_FLOATING_POINT_SUPPORTED
98 info_ptr->x_white = (float)(white_x/100000.);
99 info_ptr->y_white = (float)(white_y/100000.);
100 info_ptr->x_red = (float)( red_x/100000.);
101 info_ptr->y_red = (float)( red_y/100000.);
102 info_ptr->x_green = (float)(green_x/100000.);
103 info_ptr->y_green = (float)(green_y/100000.);
104 info_ptr->x_blue = (float)( blue_x/100000.);
105 info_ptr->y_blue = (float)( blue_y/100000.);
107 info_ptr->valid |= PNG_INFO_cHRM;
110 #endif /* PNG_FIXED_POINT_SUPPORTED */
111 #endif /* PNG_cHRM_SUPPORTED */
113 #ifdef PNG_gAMA_SUPPORTED
114 #ifdef PNG_FLOATING_POINT_SUPPORTED
116 png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
120 png_debug1(1, "in %s storage function", "gAMA");
122 if (png_ptr == NULL || info_ptr == NULL)
125 /* Check for overflow */
126 if (file_gamma > 21474.83)
128 png_warning(png_ptr, "Limiting gamma to 21474.83");
132 png_gamma = file_gamma;
133 info_ptr->gamma = (float)png_gamma;
134 #ifdef PNG_FIXED_POINT_SUPPORTED
135 info_ptr->int_gamma = (int)(png_gamma*100000.+.5);
137 info_ptr->valid |= PNG_INFO_gAMA;
138 if (png_gamma == 0.0)
139 png_warning(png_ptr, "Setting gamma=0");
143 png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
146 png_fixed_point png_gamma;
148 png_debug1(1, "in %s storage function", "gAMA");
150 if (png_ptr == NULL || info_ptr == NULL)
153 if (int_gamma > (png_fixed_point)PNG_UINT_31_MAX)
155 png_warning(png_ptr, "Limiting gamma to 21474.83");
156 png_gamma=PNG_UINT_31_MAX;
162 png_warning(png_ptr, "Setting negative gamma to zero");
166 png_gamma = int_gamma;
168 #ifdef PNG_FLOATING_POINT_SUPPORTED
169 info_ptr->gamma = (float)(png_gamma/100000.);
171 #ifdef PNG_FIXED_POINT_SUPPORTED
172 info_ptr->int_gamma = png_gamma;
174 info_ptr->valid |= PNG_INFO_gAMA;
176 png_warning(png_ptr, "Setting gamma=0");
180 #ifdef PNG_hIST_SUPPORTED
182 png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
186 png_debug1(1, "in %s storage function", "hIST");
188 if (png_ptr == NULL || info_ptr == NULL)
191 if (info_ptr->num_palette == 0 || info_ptr->num_palette
192 > PNG_MAX_PALETTE_LENGTH)
195 "Invalid palette size, hIST allocation skipped");
199 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
200 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
203 png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
204 PNG_MAX_PALETTE_LENGTH * png_sizeof(png_uint_16));
205 if (png_ptr->hist == NULL)
207 png_warning(png_ptr, "Insufficient memory for hIST chunk data");
211 for (i = 0; i < info_ptr->num_palette; i++)
212 png_ptr->hist[i] = hist[i];
213 info_ptr->hist = png_ptr->hist;
214 info_ptr->valid |= PNG_INFO_hIST;
216 info_ptr->free_me |= PNG_FREE_HIST;
221 png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
222 png_uint_32 width, png_uint_32 height, int bit_depth,
223 int color_type, int interlace_type, int compression_type,
226 png_debug1(1, "in %s storage function", "IHDR");
228 if (png_ptr == NULL || info_ptr == NULL)
231 info_ptr->width = width;
232 info_ptr->height = height;
233 info_ptr->bit_depth = (png_byte)bit_depth;
234 info_ptr->color_type = (png_byte)color_type;
235 info_ptr->compression_type = (png_byte)compression_type;
236 info_ptr->filter_type = (png_byte)filter_type;
237 info_ptr->interlace_type = (png_byte)interlace_type;
239 png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
240 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
241 info_ptr->compression_type, info_ptr->filter_type);
243 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
244 info_ptr->channels = 1;
245 else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
246 info_ptr->channels = 3;
248 info_ptr->channels = 1;
249 if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
250 info_ptr->channels++;
251 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
253 /* Check for potential overflow */
254 if (width > (PNG_UINT_32_MAX
255 >> 3) /* 8-byte RGBA pixels */
256 - 64 /* bigrowbuf hack */
257 - 1 /* filter byte */
258 - 7*8 /* rounding of width to multiple of 8 pixels */
259 - 8) /* extra max_pixel_depth pad */
260 info_ptr->rowbytes = 0;
262 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
265 #ifdef PNG_oFFs_SUPPORTED
267 png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
268 png_int_32 offset_x, png_int_32 offset_y, int unit_type)
270 png_debug1(1, "in %s storage function", "oFFs");
272 if (png_ptr == NULL || info_ptr == NULL)
275 info_ptr->x_offset = offset_x;
276 info_ptr->y_offset = offset_y;
277 info_ptr->offset_unit_type = (png_byte)unit_type;
278 info_ptr->valid |= PNG_INFO_oFFs;
282 #ifdef PNG_pCAL_SUPPORTED
284 png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
285 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
286 png_charp units, png_charpp params)
291 png_debug1(1, "in %s storage function", "pCAL");
293 if (png_ptr == NULL || info_ptr == NULL)
296 length = png_strlen(purpose) + 1;
297 png_debug1(3, "allocating purpose for info (%lu bytes)",
298 (unsigned long)length);
299 info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length);
300 if (info_ptr->pcal_purpose == NULL)
302 png_warning(png_ptr, "Insufficient memory for pCAL purpose");
305 png_memcpy(info_ptr->pcal_purpose, purpose, length);
307 png_debug(3, "storing X0, X1, type, and nparams in info");
308 info_ptr->pcal_X0 = X0;
309 info_ptr->pcal_X1 = X1;
310 info_ptr->pcal_type = (png_byte)type;
311 info_ptr->pcal_nparams = (png_byte)nparams;
313 length = png_strlen(units) + 1;
314 png_debug1(3, "allocating units for info (%lu bytes)",
315 (unsigned long)length);
316 info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);
317 if (info_ptr->pcal_units == NULL)
319 png_warning(png_ptr, "Insufficient memory for pCAL units");
322 png_memcpy(info_ptr->pcal_units, units, length);
324 info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,
325 (png_size_t)((nparams + 1) * png_sizeof(png_charp)));
326 if (info_ptr->pcal_params == NULL)
328 png_warning(png_ptr, "Insufficient memory for pCAL params");
332 png_memset(info_ptr->pcal_params, 0, (nparams + 1) * png_sizeof(png_charp));
334 for (i = 0; i < nparams; i++)
336 length = png_strlen(params[i]) + 1;
337 png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
338 (unsigned long)length);
339 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
340 if (info_ptr->pcal_params[i] == NULL)
342 png_warning(png_ptr, "Insufficient memory for pCAL parameter");
345 png_memcpy(info_ptr->pcal_params[i], params[i], length);
348 info_ptr->valid |= PNG_INFO_pCAL;
349 info_ptr->free_me |= PNG_FREE_PCAL;
353 #if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
354 #ifdef PNG_FLOATING_POINT_SUPPORTED
356 png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
357 int unit, double width, double height)
359 png_debug1(1, "in %s storage function", "sCAL");
361 if (png_ptr == NULL || info_ptr == NULL)
364 info_ptr->scal_unit = (png_byte)unit;
365 info_ptr->scal_pixel_width = width;
366 info_ptr->scal_pixel_height = height;
368 info_ptr->valid |= PNG_INFO_sCAL;
371 #ifdef PNG_FIXED_POINT_SUPPORTED
373 png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
374 int unit, png_charp swidth, png_charp sheight)
378 png_debug1(1, "in %s storage function", "sCAL");
380 if (png_ptr == NULL || info_ptr == NULL)
383 info_ptr->scal_unit = (png_byte)unit;
385 length = png_strlen(swidth) + 1;
386 png_debug1(3, "allocating unit for info (%u bytes)",
387 (unsigned int)length);
388 info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, length);
389 if (info_ptr->scal_s_width == NULL)
392 "Memory allocation failed while processing sCAL");
395 png_memcpy(info_ptr->scal_s_width, swidth, length);
397 length = png_strlen(sheight) + 1;
398 png_debug1(3, "allocating unit for info (%u bytes)",
399 (unsigned int)length);
400 info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, length);
401 if (info_ptr->scal_s_height == NULL)
403 png_free (png_ptr, info_ptr->scal_s_width);
404 info_ptr->scal_s_width = NULL;
406 "Memory allocation failed while processing sCAL");
409 png_memcpy(info_ptr->scal_s_height, sheight, length);
410 info_ptr->valid |= PNG_INFO_sCAL;
411 info_ptr->free_me |= PNG_FREE_SCAL;
417 #ifdef PNG_pHYs_SUPPORTED
419 png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
420 png_uint_32 res_x, png_uint_32 res_y, int unit_type)
422 png_debug1(1, "in %s storage function", "pHYs");
424 if (png_ptr == NULL || info_ptr == NULL)
427 info_ptr->x_pixels_per_unit = res_x;
428 info_ptr->y_pixels_per_unit = res_y;
429 info_ptr->phys_unit_type = (png_byte)unit_type;
430 info_ptr->valid |= PNG_INFO_pHYs;
435 png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
436 png_colorp palette, int num_palette)
439 png_debug1(1, "in %s storage function", "PLTE");
441 if (png_ptr == NULL || info_ptr == NULL)
444 if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)
446 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
447 png_error(png_ptr, "Invalid palette length");
450 png_warning(png_ptr, "Invalid palette length");
455 /* It may not actually be necessary to set png_ptr->palette here;
456 * we do it for backward compatibility with the way the png_handle_tRNS
457 * function used to do the allocation.
459 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
461 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
462 * of num_palette entries, in case of an invalid PNG file that has
463 * too-large sample values.
465 png_ptr->palette = (png_colorp)png_calloc(png_ptr,
466 PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color));
467 png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof(png_color));
468 info_ptr->palette = png_ptr->palette;
469 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
471 info_ptr->free_me |= PNG_FREE_PLTE;
473 info_ptr->valid |= PNG_INFO_PLTE;
476 #ifdef PNG_sBIT_SUPPORTED
478 png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
479 png_color_8p sig_bit)
481 png_debug1(1, "in %s storage function", "sBIT");
483 if (png_ptr == NULL || info_ptr == NULL)
486 png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof(png_color_8));
487 info_ptr->valid |= PNG_INFO_sBIT;
491 #ifdef PNG_sRGB_SUPPORTED
493 png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
495 png_debug1(1, "in %s storage function", "sRGB");
497 if (png_ptr == NULL || info_ptr == NULL)
500 info_ptr->srgb_intent = (png_byte)intent;
501 info_ptr->valid |= PNG_INFO_sRGB;
505 png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
508 #ifdef PNG_gAMA_SUPPORTED
509 #ifdef PNG_FLOATING_POINT_SUPPORTED
512 #ifdef PNG_FIXED_POINT_SUPPORTED
513 png_fixed_point int_file_gamma;
516 #ifdef PNG_cHRM_SUPPORTED
517 #ifdef PNG_FLOATING_POINT_SUPPORTED
518 float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
520 png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
521 int_green_y, int_blue_x, int_blue_y;
523 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
525 if (png_ptr == NULL || info_ptr == NULL)
528 png_set_sRGB(png_ptr, info_ptr, intent);
530 #ifdef PNG_gAMA_SUPPORTED
531 #ifdef PNG_FLOATING_POINT_SUPPORTED
532 file_gamma = (float).45455;
533 png_set_gAMA(png_ptr, info_ptr, file_gamma);
535 #ifdef PNG_FIXED_POINT_SUPPORTED
536 int_file_gamma = 45455L;
537 png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);
541 #ifdef PNG_cHRM_SUPPORTED
542 int_white_x = 31270L;
543 int_white_y = 32900L;
546 int_green_x = 30000L;
547 int_green_y = 60000L;
551 #ifdef PNG_FLOATING_POINT_SUPPORTED
552 white_x = (float).3127;
553 white_y = (float).3290;
556 green_x = (float).30;
557 green_y = (float).60;
562 #ifdef PNG_FIXED_POINT_SUPPORTED
563 png_set_cHRM_fixed(png_ptr, info_ptr,
564 int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
565 int_green_y, int_blue_x, int_blue_y);
567 #ifdef PNG_FLOATING_POINT_SUPPORTED
568 png_set_cHRM(png_ptr, info_ptr,
569 white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
576 #ifdef PNG_iCCP_SUPPORTED
578 png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
579 png_charp name, int compression_type,
580 png_charp profile, png_uint_32 proflen)
582 png_charp new_iccp_name;
583 png_charp new_iccp_profile;
586 png_debug1(1, "in %s storage function", "iCCP");
588 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
591 length = png_strlen(name)+1;
592 new_iccp_name = (png_charp)png_malloc_warn(png_ptr, length);
593 if (new_iccp_name == NULL)
595 png_warning(png_ptr, "Insufficient memory to process iCCP chunk");
598 png_memcpy(new_iccp_name, name, length);
599 new_iccp_profile = (png_charp)png_malloc_warn(png_ptr, proflen);
600 if (new_iccp_profile == NULL)
602 png_free (png_ptr, new_iccp_name);
604 "Insufficient memory to process iCCP profile");
607 png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
609 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
611 info_ptr->iccp_proflen = proflen;
612 info_ptr->iccp_name = new_iccp_name;
613 info_ptr->iccp_profile = new_iccp_profile;
614 /* Compression is always zero but is here so the API and info structure
615 * does not have to change if we introduce multiple compression types
617 info_ptr->iccp_compression = (png_byte)compression_type;
618 info_ptr->free_me |= PNG_FREE_ICCP;
619 info_ptr->valid |= PNG_INFO_iCCP;
623 #ifdef PNG_TEXT_SUPPORTED
625 png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
629 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
631 png_error(png_ptr, "Insufficient memory to store text");
635 png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
640 png_debug1(1, "in %s storage function", ((png_ptr == NULL ||
641 png_ptr->chunk_name[0] == '\0') ?
642 "text" : (png_const_charp)png_ptr->chunk_name));
644 if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
647 /* Make sure we have enough space in the "text" array in info_struct
648 * to hold all of the incoming text_ptr objects.
650 if (info_ptr->num_text + num_text > info_ptr->max_text)
652 if (info_ptr->text != NULL)
657 old_max = info_ptr->max_text;
658 info_ptr->max_text = info_ptr->num_text + num_text + 8;
659 old_text = info_ptr->text;
660 info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
661 (png_size_t)(info_ptr->max_text * png_sizeof(png_text)));
662 if (info_ptr->text == NULL)
664 png_free(png_ptr, old_text);
667 png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
668 png_sizeof(png_text)));
669 png_free(png_ptr, old_text);
673 info_ptr->max_text = num_text + 8;
674 info_ptr->num_text = 0;
675 info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
676 (png_size_t)(info_ptr->max_text * png_sizeof(png_text)));
677 if (info_ptr->text == NULL)
679 info_ptr->free_me |= PNG_FREE_TEXT;
681 png_debug1(3, "allocated %d entries for info_ptr->text",
684 for (i = 0; i < num_text; i++)
686 png_size_t text_length, key_len;
687 png_size_t lang_len, lang_key_len;
688 png_textp textp = &(info_ptr->text[info_ptr->num_text]);
690 if (text_ptr[i].key == NULL)
693 key_len = png_strlen(text_ptr[i].key);
695 if (text_ptr[i].compression <= 0)
702 #ifdef PNG_iTXt_SUPPORTED
706 if (text_ptr[i].lang != NULL)
707 lang_len = png_strlen(text_ptr[i].lang);
710 if (text_ptr[i].lang_key != NULL)
711 lang_key_len = png_strlen(text_ptr[i].lang_key);
715 #else /* PNG_iTXt_SUPPORTED */
717 png_warning(png_ptr, "iTXt chunk not supported");
722 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
725 #ifdef PNG_iTXt_SUPPORTED
726 if (text_ptr[i].compression > 0)
727 textp->compression = PNG_ITXT_COMPRESSION_NONE;
730 textp->compression = PNG_TEXT_COMPRESSION_NONE;
735 text_length = png_strlen(text_ptr[i].text);
736 textp->compression = text_ptr[i].compression;
739 textp->key = (png_charp)png_malloc_warn(png_ptr,
741 (key_len + text_length + lang_len + lang_key_len + 4));
742 if (textp->key == NULL)
744 png_debug2(2, "Allocated %lu bytes at %x in png_set_text",
745 (unsigned long)(png_uint_32)
746 (key_len + lang_len + lang_key_len + text_length + 4),
749 png_memcpy(textp->key, text_ptr[i].key,(png_size_t)(key_len));
750 *(textp->key + key_len) = '\0';
751 #ifdef PNG_iTXt_SUPPORTED
752 if (text_ptr[i].compression > 0)
754 textp->lang = textp->key + key_len + 1;
755 png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
756 *(textp->lang + lang_len) = '\0';
757 textp->lang_key = textp->lang + lang_len + 1;
758 png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
759 *(textp->lang_key + lang_key_len) = '\0';
760 textp->text = textp->lang_key + lang_key_len + 1;
765 #ifdef PNG_iTXt_SUPPORTED
767 textp->lang_key=NULL;
769 textp->text = textp->key + key_len + 1;
772 png_memcpy(textp->text, text_ptr[i].text,
773 (png_size_t)(text_length));
774 *(textp->text + text_length) = '\0';
776 #ifdef PNG_iTXt_SUPPORTED
777 if (textp->compression > 0)
779 textp->text_length = 0;
780 textp->itxt_length = text_length;
786 textp->text_length = text_length;
787 #ifdef PNG_iTXt_SUPPORTED
788 textp->itxt_length = 0;
791 info_ptr->num_text++;
792 png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
798 #ifdef PNG_tIME_SUPPORTED
800 png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
802 png_debug1(1, "in %s storage function", "tIME");
804 if (png_ptr == NULL || info_ptr == NULL ||
805 (png_ptr->mode & PNG_WROTE_tIME))
808 png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof(png_time));
809 info_ptr->valid |= PNG_INFO_tIME;
813 #ifdef PNG_tRNS_SUPPORTED
815 png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
816 png_bytep trans_alpha, int num_trans, png_color_16p trans_color)
818 png_debug1(1, "in %s storage function", "tRNS");
820 if (png_ptr == NULL || info_ptr == NULL)
823 if (trans_alpha != NULL)
825 /* It may not actually be necessary to set png_ptr->trans_alpha here;
826 * we do it for backward compatibility with the way the png_handle_tRNS
827 * function used to do the allocation.
830 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
832 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
833 png_ptr->trans_alpha = info_ptr->trans_alpha = (png_bytep)png_malloc(png_ptr,
834 (png_size_t)PNG_MAX_PALETTE_LENGTH);
835 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
836 png_memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
839 if (trans_color != NULL)
841 int sample_max = (1 << info_ptr->bit_depth);
842 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
843 (int)trans_color->gray > sample_max) ||
844 (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
845 ((int)trans_color->red > sample_max ||
846 (int)trans_color->green > sample_max ||
847 (int)trans_color->blue > sample_max)))
849 "tRNS chunk has out-of-range samples for bit_depth");
850 png_memcpy(&(info_ptr->trans_color), trans_color,
851 png_sizeof(png_color_16));
856 info_ptr->num_trans = (png_uint_16)num_trans;
859 info_ptr->valid |= PNG_INFO_tRNS;
860 info_ptr->free_me |= PNG_FREE_TRNS;
865 #ifdef PNG_sPLT_SUPPORTED
867 png_set_sPLT(png_structp png_ptr,
868 png_infop info_ptr, png_sPLT_tp entries, int nentries)
870 * entries - array of png_sPLT_t structures
871 * to be added to the list of palettes
872 * in the info structure.
873 * nentries - number of palette structures to be
880 if (png_ptr == NULL || info_ptr == NULL)
883 np = (png_sPLT_tp)png_malloc_warn(png_ptr,
884 (info_ptr->splt_palettes_num + nentries) *
885 (png_size_t)png_sizeof(png_sPLT_t));
888 png_warning(png_ptr, "No memory for sPLT palettes");
892 png_memcpy(np, info_ptr->splt_palettes,
893 info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));
894 png_free(png_ptr, info_ptr->splt_palettes);
895 info_ptr->splt_palettes=NULL;
897 for (i = 0; i < nentries; i++)
899 png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
900 png_sPLT_tp from = entries + i;
903 length = png_strlen(from->name) + 1;
904 to->name = (png_charp)png_malloc_warn(png_ptr, (png_size_t)length);
905 if (to->name == NULL)
908 "Out of memory while processing sPLT chunk");
911 png_memcpy(to->name, from->name, length);
912 to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
913 (png_size_t)(from->nentries * png_sizeof(png_sPLT_entry)));
914 if (to->entries == NULL)
917 "Out of memory while processing sPLT chunk");
918 png_free(png_ptr, to->name);
922 png_memcpy(to->entries, from->entries,
923 from->nentries * png_sizeof(png_sPLT_entry));
924 to->nentries = from->nentries;
925 to->depth = from->depth;
928 info_ptr->splt_palettes = np;
929 info_ptr->splt_palettes_num += nentries;
930 info_ptr->valid |= PNG_INFO_sPLT;
931 info_ptr->free_me |= PNG_FREE_SPLT;
933 #endif /* PNG_sPLT_SUPPORTED */
935 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
937 png_set_unknown_chunks(png_structp png_ptr,
938 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
940 png_unknown_chunkp np;
943 if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
946 np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
947 (png_size_t)((info_ptr->unknown_chunks_num + num_unknowns) *
948 png_sizeof(png_unknown_chunk)));
952 "Out of memory while processing unknown chunk");
956 png_memcpy(np, info_ptr->unknown_chunks,
957 info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk));
958 png_free(png_ptr, info_ptr->unknown_chunks);
959 info_ptr->unknown_chunks = NULL;
961 for (i = 0; i < num_unknowns; i++)
963 png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
964 png_unknown_chunkp from = unknowns + i;
966 png_memcpy((png_charp)to->name, (png_charp)from->name,
967 png_sizeof(from->name));
968 to->name[png_sizeof(to->name)-1] = '\0';
969 to->size = from->size;
970 /* Note our location in the read or write sequence */
971 to->location = (png_byte)(png_ptr->mode & 0xff);
977 to->data = (png_bytep)png_malloc_warn(png_ptr,
978 (png_size_t)from->size);
979 if (to->data == NULL)
982 "Out of memory while processing unknown chunk");
986 png_memcpy(to->data, from->data, from->size);
990 info_ptr->unknown_chunks = np;
991 info_ptr->unknown_chunks_num += num_unknowns;
992 info_ptr->free_me |= PNG_FREE_UNKN;
995 png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
996 int chunk, int location)
998 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
999 (int)info_ptr->unknown_chunks_num)
1000 info_ptr->unknown_chunks[chunk].location = (png_byte)location;
1005 #ifdef PNG_MNG_FEATURES_SUPPORTED
1007 png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
1009 png_debug(1, "in png_permit_mng_features");
1011 if (png_ptr == NULL)
1012 return (png_uint_32)0;
1013 png_ptr->mng_features_permitted =
1014 (png_byte)(mng_features & PNG_ALL_MNG_FEATURES);
1015 return (png_uint_32)png_ptr->mng_features_permitted;
1019 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1021 png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
1022 chunk_list, int num_chunks)
1024 png_bytep new_list, p;
1025 int i, old_num_chunks;
1026 if (png_ptr == NULL)
1028 if (num_chunks == 0)
1030 if (keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE)
1031 png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1033 png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1035 if (keep == PNG_HANDLE_CHUNK_ALWAYS)
1036 png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1038 png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1041 if (chunk_list == NULL)
1043 old_num_chunks = png_ptr->num_chunk_list;
1044 new_list=(png_bytep)png_malloc(png_ptr,
1046 (5*(num_chunks + old_num_chunks)));
1047 if (png_ptr->chunk_list != NULL)
1049 png_memcpy(new_list, png_ptr->chunk_list,
1050 (png_size_t)(5*old_num_chunks));
1051 png_free(png_ptr, png_ptr->chunk_list);
1052 png_ptr->chunk_list=NULL;
1054 png_memcpy(new_list + 5*old_num_chunks, chunk_list,
1055 (png_size_t)(5*num_chunks));
1056 for (p = new_list + 5*old_num_chunks + 4, i = 0; i<num_chunks; i++, p += 5)
1058 png_ptr->num_chunk_list = old_num_chunks + num_chunks;
1059 png_ptr->chunk_list = new_list;
1060 png_ptr->free_me |= PNG_FREE_LIST;
1064 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1066 png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
1067 png_user_chunk_ptr read_user_chunk_fn)
1069 png_debug(1, "in png_set_read_user_chunk_fn");
1071 if (png_ptr == NULL)
1074 png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1075 png_ptr->user_chunk_ptr = user_chunk_ptr;
1079 #ifdef PNG_INFO_IMAGE_SUPPORTED
1081 png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
1083 png_debug1(1, "in %s storage function", "rows");
1085 if (png_ptr == NULL || info_ptr == NULL)
1088 if (info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
1089 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1090 info_ptr->row_pointers = row_pointers;
1092 info_ptr->valid |= PNG_INFO_IDAT;
1097 png_set_compression_buffer_size(png_structp png_ptr,
1100 if (png_ptr == NULL)
1102 png_free(png_ptr, png_ptr->zbuf);
1103 png_ptr->zbuf_size = size;
1104 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
1105 png_ptr->zstream.next_out = png_ptr->zbuf;
1106 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
1110 png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
1112 if (png_ptr && info_ptr)
1113 info_ptr->valid &= ~mask;
1118 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1119 /* This function was added to libpng 1.2.6 */
1121 png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max,
1122 png_uint_32 user_height_max)
1124 /* Images with dimensions larger than these limits will be
1125 * rejected by png_set_IHDR(). To accept any PNG datastream
1126 * regardless of dimensions, set both limits to 0x7ffffffL.
1128 if (png_ptr == NULL)
1130 png_ptr->user_width_max = user_width_max;
1131 png_ptr->user_height_max = user_height_max;
1134 /* This function was added to libpng 1.4.0 */
1136 png_set_chunk_cache_max (png_structp png_ptr,
1137 png_uint_32 user_chunk_cache_max)
1140 png_ptr->user_chunk_cache_max = user_chunk_cache_max;
1143 /* This function was added to libpng 1.4.1 */
1145 png_set_chunk_malloc_max (png_structp png_ptr,
1146 png_alloc_size_t user_chunk_malloc_max)
1149 png_ptr->user_chunk_malloc_max =
1150 (png_size_t)user_chunk_malloc_max;
1152 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
1155 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
1157 png_set_benign_errors(png_structp png_ptr, int allowed)
1159 png_debug(1, "in png_set_benign_errors");
1162 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN;
1164 png_ptr->flags &= ~PNG_FLAG_BENIGN_ERRORS_WARN;
1166 #endif /* PNG_BENIGN_ERRORS_SUPPORTED */
1167 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */