2
/* pngset.c - storage of image information into info struct
4
* libpng 1.0.8 - July 24, 2000
5
* For conditions of distribution and use, see copyright notice in png.h
6
* Copyright (c) 1998, 1999, 2000 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.)
10
* The functions here are used during reads to store data from the file
11
* into the info struct, and during writes to store application data
12
* into the info struct for writing into the file. This abstracts the
13
* info struct and allows us to change the structure in the future.
19
#if defined(PNG_bKGD_SUPPORTED)
21
png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
23
png_debug1(1, "in %s storage function\n", "bKGD");
24
if (png_ptr == NULL || info_ptr == NULL)
27
png_memcpy(&(info_ptr->background), background, sizeof(png_color_16));
28
info_ptr->valid |= PNG_INFO_bKGD;
32
#if defined(PNG_cHRM_SUPPORTED)
33
#ifdef PNG_FLOATING_POINT_SUPPORTED
35
png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
36
double white_x, double white_y, double red_x, double red_y,
37
double green_x, double green_y, double blue_x, double blue_y)
39
png_debug1(1, "in %s storage function\n", "cHRM");
40
if (png_ptr == NULL || info_ptr == NULL)
43
info_ptr->x_white = (float)white_x;
44
info_ptr->y_white = (float)white_y;
45
info_ptr->x_red = (float)red_x;
46
info_ptr->y_red = (float)red_y;
47
info_ptr->x_green = (float)green_x;
48
info_ptr->y_green = (float)green_y;
49
info_ptr->x_blue = (float)blue_x;
50
info_ptr->y_blue = (float)blue_y;
51
#ifdef PNG_FIXED_POINT_SUPPORTED
52
info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
53
info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
54
info_ptr->int_x_red = (png_fixed_point)(red_x*100000.+0.5);
55
info_ptr->int_y_red = (png_fixed_point)(red_y*100000.+0.5);
56
info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
57
info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
58
info_ptr->int_x_blue = (png_fixed_point)(blue_x*100000.+0.5);
59
info_ptr->int_y_blue = (png_fixed_point)(blue_y*100000.+0.5);
61
info_ptr->valid |= PNG_INFO_cHRM;
64
#ifdef PNG_FIXED_POINT_SUPPORTED
66
png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
67
png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
68
png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
69
png_fixed_point blue_x, png_fixed_point blue_y)
71
png_debug1(1, "in %s storage function\n", "cHRM");
72
if (png_ptr == NULL || info_ptr == NULL)
75
info_ptr->int_x_white = white_x;
76
info_ptr->int_y_white = white_y;
77
info_ptr->int_x_red = red_x;
78
info_ptr->int_y_red = red_y;
79
info_ptr->int_x_green = green_x;
80
info_ptr->int_y_green = green_y;
81
info_ptr->int_x_blue = blue_x;
82
info_ptr->int_y_blue = blue_y;
83
#ifdef PNG_FLOATING_POINT_SUPPORTED
84
info_ptr->x_white = (float)(white_x/100000.);
85
info_ptr->y_white = (float)(white_y/100000.);
86
info_ptr->x_red = (float)(red_x/100000.);
87
info_ptr->y_red = (float)(red_y/100000.);
88
info_ptr->x_green = (float)(green_x/100000.);
89
info_ptr->y_green = (float)(green_y/100000.);
90
info_ptr->x_blue = (float)(blue_x/100000.);
91
info_ptr->y_blue = (float)(blue_y/100000.);
93
info_ptr->valid |= PNG_INFO_cHRM;
98
#if defined(PNG_gAMA_SUPPORTED)
99
#ifdef PNG_FLOATING_POINT_SUPPORTED
101
png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
103
png_debug1(1, "in %s storage function\n", "gAMA");
104
if (png_ptr == NULL || info_ptr == NULL)
107
info_ptr->gamma = (float)file_gamma;
108
#ifdef PNG_FIXED_POINT_SUPPORTED
109
info_ptr->int_gamma = (int)(file_gamma*100000.+.5);
111
info_ptr->valid |= PNG_INFO_gAMA;
116
png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
119
png_debug1(1, "in %s storage function\n", "gAMA");
120
if (png_ptr == NULL || info_ptr == NULL)
123
#ifdef PNG_FLOATING_POINT_SUPPORTED
124
info_ptr->gamma = (float)(int_gamma/100000.);
126
#ifdef PNG_FIXED_POINT_SUPPORTED
127
info_ptr->int_gamma = int_gamma;
129
info_ptr->valid |= PNG_INFO_gAMA;
132
#if defined(PNG_hIST_SUPPORTED)
134
png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
136
png_debug1(1, "in %s storage function\n", "hIST");
137
if (png_ptr == NULL || info_ptr == NULL)
140
info_ptr->hist = hist;
141
info_ptr->valid |= PNG_INFO_hIST;
146
png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
147
png_uint_32 width, png_uint_32 height, int bit_depth,
148
int color_type, int interlace_type, int compression_type,
151
int rowbytes_per_pixel;
152
png_debug1(1, "in %s storage function\n", "IHDR");
153
if (png_ptr == NULL || info_ptr == NULL)
156
info_ptr->width = width;
157
info_ptr->height = height;
158
info_ptr->bit_depth = (png_byte)bit_depth;
159
info_ptr->color_type =(png_byte) color_type;
160
info_ptr->compression_type = (png_byte)compression_type;
161
info_ptr->filter_type = (png_byte)filter_type;
162
info_ptr->interlace_type = (png_byte)interlace_type;
163
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
164
info_ptr->channels = 1;
165
else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
166
info_ptr->channels = 3;
168
info_ptr->channels = 1;
169
if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
170
info_ptr->channels++;
171
info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
173
/* check for overflow */
174
rowbytes_per_pixel = (info_ptr->pixel_depth + 7) >> 3;
175
if (( width > PNG_MAX_UINT/rowbytes_per_pixel))
178
"Width too large to process image data; rowbytes will overflow.");
179
info_ptr->rowbytes = (png_size_t)0;
182
info_ptr->rowbytes = (info_ptr->width * info_ptr->pixel_depth + 7) >> 3;
185
#if defined(PNG_oFFs_SUPPORTED)
187
png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
188
png_int_32 offset_x, png_int_32 offset_y, int unit_type)
190
png_debug1(1, "in %s storage function\n", "oFFs");
191
if (png_ptr == NULL || info_ptr == NULL)
194
info_ptr->x_offset = offset_x;
195
info_ptr->y_offset = offset_y;
196
info_ptr->offset_unit_type = (png_byte)unit_type;
197
info_ptr->valid |= PNG_INFO_oFFs;
201
#if defined(PNG_pCAL_SUPPORTED)
203
png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
204
png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
205
png_charp units, png_charpp params)
210
png_debug1(1, "in %s storage function\n", "pCAL");
211
if (png_ptr == NULL || info_ptr == NULL)
214
length = png_strlen(purpose) + 1;
215
png_debug1(3, "allocating purpose for info (%lu bytes)\n", length);
216
info_ptr->pcal_purpose = (png_charp)png_malloc(png_ptr, length);
217
png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
219
png_debug(3, "storing X0, X1, type, and nparams in info\n");
220
info_ptr->pcal_X0 = X0;
221
info_ptr->pcal_X1 = X1;
222
info_ptr->pcal_type = (png_byte)type;
223
info_ptr->pcal_nparams = (png_byte)nparams;
225
length = png_strlen(units) + 1;
226
png_debug1(3, "allocating units for info (%lu bytes)\n", length);
227
info_ptr->pcal_units = (png_charp)png_malloc(png_ptr, length);
228
png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
230
info_ptr->pcal_params = (png_charpp)png_malloc(png_ptr,
231
(png_uint_32)((nparams + 1) * sizeof(png_charp)));
232
info_ptr->pcal_params[nparams] = NULL;
234
for (i = 0; i < nparams; i++)
236
length = png_strlen(params[i]) + 1;
237
png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i, length);
238
info_ptr->pcal_params[i] = (png_charp)png_malloc(png_ptr, length);
239
png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
242
info_ptr->valid |= PNG_INFO_pCAL;
243
#ifdef PNG_FREE_ME_SUPPORTED
244
info_ptr->free_me |= PNG_FREE_PCAL;
249
#if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
250
#ifdef PNG_FLOATING_POINT_SUPPORTED
252
png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
253
int unit, double width, double height)
255
png_debug1(1, "in %s storage function\n", "sCAL");
256
if (png_ptr == NULL || info_ptr == NULL)
259
info_ptr->scal_unit = (png_byte)unit;
260
info_ptr->scal_pixel_width = width;
261
info_ptr->scal_pixel_height = height;
263
info_ptr->valid |= PNG_INFO_sCAL;
266
#ifdef PNG_FIXED_POINT_SUPPORTED
268
png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
269
int unit, png_charp swidth, png_charp sheight)
273
png_debug1(1, "in %s storage function\n", "sCAL");
274
if (png_ptr == NULL || info_ptr == NULL)
277
info_ptr->scal_unit = (png_byte)unit;
279
length = png_strlen(swidth) + 1;
280
png_debug1(3, "allocating unit for info (%d bytes)\n", length);
281
info_ptr->scal_s_width = (png_charp)png_malloc(png_ptr, length);
282
png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);
284
length = png_strlen(sheight) + 1;
285
png_debug1(3, "allocating unit for info (%d bytes)\n", length);
286
info_ptr->scal_s_width = (png_charp)png_malloc(png_ptr, length);
287
png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
289
info_ptr->valid |= PNG_INFO_sCAL;
290
#ifdef PNG_FREE_ME_SUPPORTED
291
info_ptr->free_me |= PNG_FREE_SCAL;
298
#if defined(PNG_pHYs_SUPPORTED)
300
png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
301
png_uint_32 res_x, png_uint_32 res_y, int unit_type)
303
png_debug1(1, "in %s storage function\n", "pHYs");
304
if (png_ptr == NULL || info_ptr == NULL)
307
info_ptr->x_pixels_per_unit = res_x;
308
info_ptr->y_pixels_per_unit = res_y;
309
info_ptr->phys_unit_type = (png_byte)unit_type;
310
info_ptr->valid |= PNG_INFO_pHYs;
315
png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
316
png_colorp palette, int num_palette)
319
png_debug1(1, "in %s storage function\n", "PLTE");
320
if (png_ptr == NULL || info_ptr == NULL)
323
info_ptr->palette = palette;
325
info_ptr->num_palette = (png_uint_16)num_palette;
326
info_ptr->valid |= PNG_INFO_PLTE;
329
#if defined(PNG_sBIT_SUPPORTED)
331
png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
332
png_color_8p sig_bit)
334
png_debug1(1, "in %s storage function\n", "sBIT");
335
if (png_ptr == NULL || info_ptr == NULL)
338
png_memcpy(&(info_ptr->sig_bit), sig_bit, sizeof (png_color_8));
339
info_ptr->valid |= PNG_INFO_sBIT;
343
#if defined(PNG_sRGB_SUPPORTED)
345
png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
347
png_debug1(1, "in %s storage function\n", "sRGB");
348
if (png_ptr == NULL || info_ptr == NULL)
351
info_ptr->srgb_intent = (png_byte)intent;
352
info_ptr->valid |= PNG_INFO_sRGB;
356
png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
359
#if defined(PNG_gAMA_SUPPORTED)
360
#ifdef PNG_FLOATING_POINT_SUPPORTED
363
#ifdef PNG_FIXED_POINT_SUPPORTED
364
png_fixed_point int_file_gamma;
367
#if defined(PNG_cHRM_SUPPORTED)
368
#ifdef PNG_FLOATING_POINT_SUPPORTED
369
float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
371
#ifdef PNG_FIXED_POINT_SUPPORTED
372
png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
373
int_green_y, int_blue_x, int_blue_y;
376
png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");
377
if (png_ptr == NULL || info_ptr == NULL)
380
png_set_sRGB(png_ptr, info_ptr, intent);
382
#if defined(PNG_gAMA_SUPPORTED)
383
#ifdef PNG_FLOATING_POINT_SUPPORTED
384
file_gamma = (float).45455;
385
png_set_gAMA(png_ptr, info_ptr, file_gamma);
387
#ifdef PNG_FIXED_POINT_SUPPORTED
388
int_file_gamma = 45455L;
389
png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);
393
#if defined(PNG_cHRM_SUPPORTED)
394
#ifdef PNG_FIXED_POINT_SUPPORTED
395
int_white_x = 31270L;
396
int_white_y = 32900L;
399
int_green_x = 30000L;
400
int_green_y = 60000L;
404
png_set_cHRM_fixed(png_ptr, info_ptr,
405
int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, int_green_y,
406
int_blue_x, int_blue_y);
408
#ifdef PNG_FLOATING_POINT_SUPPORTED
409
white_x = (float).3127;
410
white_y = (float).3290;
413
green_x = (float).30;
414
green_y = (float).60;
418
png_set_cHRM(png_ptr, info_ptr,
419
white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
426
#if defined(PNG_iCCP_SUPPORTED)
428
png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
429
png_charp name, int compression_type,
430
png_charp profile, png_uint_32 proflen)
432
png_charp new_iccp_name;
433
png_charp new_iccp_profile;
435
png_debug1(1, "in %s storage function\n", "iCCP");
436
if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
439
new_iccp_name = png_malloc(png_ptr, png_strlen(name)+1);
440
strcpy(new_iccp_name, name);
441
new_iccp_profile = png_malloc(png_ptr, proflen);
442
png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
444
png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
446
info_ptr->iccp_proflen = proflen;
447
info_ptr->iccp_name = new_iccp_name;
448
info_ptr->iccp_profile = new_iccp_profile;
449
/* Compression is always zero but is here so the API and info structure
450
* does not have to change if we introduce multiple compression types */
451
info_ptr->iccp_compression = (png_byte)compression_type;
452
#ifdef PNG_FREE_ME_SUPPORTED
453
info_ptr->free_me |= PNG_FREE_ICCP;
455
info_ptr->valid |= PNG_INFO_iCCP;
459
#if defined(PNG_TEXT_SUPPORTED)
461
png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
466
png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ?
467
"text" : (png_const_charp)png_ptr->chunk_name));
469
if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
472
/* Make sure we have enough space in the "text" array in info_struct
473
* to hold all of the incoming text_ptr objects.
475
if (info_ptr->num_text + num_text > info_ptr->max_text)
477
if (info_ptr->text != NULL)
482
old_max = info_ptr->max_text;
483
info_ptr->max_text = info_ptr->num_text + num_text + 8;
484
old_text = info_ptr->text;
485
info_ptr->text = (png_textp)png_malloc(png_ptr,
486
(png_uint_32)(info_ptr->max_text * sizeof (png_text)));
487
png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
489
png_free(png_ptr, old_text);
493
info_ptr->max_text = num_text + 8;
494
info_ptr->num_text = 0;
495
info_ptr->text = (png_textp)png_malloc(png_ptr,
496
(png_uint_32)(info_ptr->max_text * sizeof (png_text)));
497
#ifdef PNG_FREE_ME_SUPPORTED
498
info_ptr->free_me |= PNG_FREE_TEXT;
501
png_debug1(3, "allocated %d entries for info_ptr->text\n",
504
for (i = 0; i < num_text; i++)
506
png_size_t text_length,key_len;
507
png_size_t lang_len,lang_key_len;
508
png_textp textp = &(info_ptr->text[info_ptr->num_text]);
510
if (text_ptr[i].key == (png_charp)NULL)
513
key_len = png_strlen(text_ptr[i].key);
515
if(text_ptr[i].compression <= 0)
521
#ifdef PNG_iTXt_SUPPORTED
524
if (text_ptr[i].key != (png_charp)NULL)
525
lang_len = png_strlen(text_ptr[i].lang);
528
if (text_ptr[i].lang_key != (png_charp)NULL)
529
lang_key_len = png_strlen(text_ptr[i].lang_key);
535
png_warning(png_ptr, "iTXt chunk not supported.");
540
if (text_ptr[i].text == (png_charp)NULL || text_ptr[i].text[0] == '\0')
543
#ifdef PNG_iTXt_SUPPORTED
544
if(text_ptr[i].compression > 0)
545
textp->compression = PNG_ITXT_COMPRESSION_NONE;
548
textp->compression = PNG_TEXT_COMPRESSION_NONE;
552
text_length = png_strlen(text_ptr[i].text);
553
textp->compression = text_ptr[i].compression;
556
textp->key = (png_charp)png_malloc(png_ptr,
557
(png_uint_32)(key_len + text_length + lang_len + lang_key_len + 4));
558
png_debug2(2, "Allocated %d bytes at %x in png_set_text\n",
559
key_len + lang_len + lang_key_len + text_length + 4, (int)textp->key);
561
png_memcpy(textp->key, text_ptr[i].key,
562
(png_size_t)(key_len));
563
*(textp->key+key_len) = '\0';
564
#ifdef PNG_iTXt_SUPPORTED
565
if (text_ptr[i].compression > 0)
567
textp->lang=textp->key + key_len + 1;
568
png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
569
*(textp->lang+lang_len) = '\0';
570
textp->lang_key=textp->lang + lang_len + 1;
571
png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
572
*(textp->lang_key+lang_key_len) = '\0';
573
textp->text=textp->lang_key + lang_key_len + 1;
578
#ifdef PNG_iTXt_SUPPORTED
579
textp->lang=(png_charp)NULL;
580
textp->lang_key=(png_charp)NULL;
582
textp->text=textp->key + key_len + 1;
585
png_memcpy(textp->text, text_ptr[i].text,
586
(png_size_t)(text_length));
587
*(textp->text+text_length) = '\0';
589
#ifdef PNG_iTXt_SUPPORTED
590
if(textp->compression > 0)
592
textp->text_length = 0;
593
textp->itxt_length = text_length;
598
textp->text_length = text_length;
599
#ifdef PNG_iTXt_SUPPORTED
600
textp->itxt_length = 0;
603
info_ptr->text[info_ptr->num_text]= *textp;
604
info_ptr->num_text++;
605
png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
610
#if defined(PNG_tIME_SUPPORTED)
612
png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
614
png_debug1(1, "in %s storage function\n", "tIME");
615
if (png_ptr == NULL || info_ptr == NULL ||
616
(png_ptr->mode & PNG_WROTE_tIME))
619
png_memcpy(&(info_ptr->mod_time), mod_time, sizeof (png_time));
620
info_ptr->valid |= PNG_INFO_tIME;
624
#if defined(PNG_tRNS_SUPPORTED)
626
png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
627
png_bytep trans, int num_trans, png_color_16p trans_values)
629
png_debug1(1, "in %s storage function\n", "tRNS");
630
if (png_ptr == NULL || info_ptr == NULL)
634
info_ptr->trans = trans;
636
if (trans_values != NULL)
638
png_memcpy(&(info_ptr->trans_values), trans_values,
639
sizeof(png_color_16));
643
info_ptr->num_trans = (png_uint_16)num_trans;
644
info_ptr->valid |= PNG_INFO_tRNS;
648
#if defined(PNG_sPLT_SUPPORTED)
650
png_set_sPLT(png_structp png_ptr,
651
png_infop info_ptr, png_sPLT_tp entries, int nentries)
656
np = (png_sPLT_tp)png_malloc(png_ptr,
657
(info_ptr->splt_palettes_num + nentries) * sizeof(png_sPLT_t));
659
png_memcpy(np, info_ptr->splt_palettes,
660
info_ptr->splt_palettes_num * sizeof(png_sPLT_t));
661
png_free(png_ptr, info_ptr->splt_palettes);
662
info_ptr->splt_palettes=NULL;
664
for (i = 0; i < nentries; i++)
666
png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
667
png_sPLT_tp from = entries + i;
669
to->name = (png_charp)png_malloc(png_ptr,
670
png_strlen(from->name) + 1);
671
png_strcpy(to->name, from->name);
672
to->entries = (png_sPLT_entryp)png_malloc(png_ptr,
673
from->nentries * sizeof(png_sPLT_t));
674
png_memcpy(to->entries, from->entries,
675
from->nentries * sizeof(png_sPLT_t));
676
to->nentries = from->nentries;
677
to->depth = from->depth;
680
info_ptr->splt_palettes = np;
681
info_ptr->splt_palettes_num += nentries;
682
info_ptr->valid |= PNG_INFO_sPLT;
683
#ifdef PNG_FREE_ME_SUPPORTED
684
info_ptr->free_me |= PNG_FREE_SPLT;
687
#endif /* PNG_sPLT_SUPPORTED */
689
#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
691
png_set_unknown_chunks(png_structp png_ptr,
692
png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
694
png_unknown_chunkp np;
697
if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
700
np = (png_unknown_chunkp)png_malloc(png_ptr,
701
(info_ptr->unknown_chunks_num + num_unknowns) *
702
sizeof(png_unknown_chunk));
704
png_memcpy(np, info_ptr->unknown_chunks,
705
info_ptr->unknown_chunks_num * sizeof(png_unknown_chunk));
706
png_free(png_ptr, info_ptr->unknown_chunks);
707
info_ptr->unknown_chunks=NULL;
709
for (i = 0; i < num_unknowns; i++)
711
png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
712
png_unknown_chunkp from = unknowns + i;
714
png_strcpy((png_charp)to->name, (png_charp)from->name);
715
to->data = (png_bytep)png_malloc(png_ptr, from->size);
716
png_memcpy(to->data, from->data, from->size);
717
to->size = from->size;
719
/* note our location in the read or write sequence */
720
to->location = (png_byte)(png_ptr->mode & 0xff);
723
info_ptr->unknown_chunks = np;
724
info_ptr->unknown_chunks_num += num_unknowns;
725
#ifdef PNG_FREE_ME_SUPPORTED
726
info_ptr->free_me |= PNG_FREE_UNKN;
730
png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
731
int chunk, int location)
733
if(png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
734
(int)info_ptr->unknown_chunks_num)
735
info_ptr->unknown_chunks[chunk].location = (png_byte)location;
739
#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
740
defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
742
png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
744
png_debug(1, "in png_permit_empty_plte\n");
747
png_ptr->empty_plte_permitted=(png_byte)empty_plte_permitted;
751
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
753
png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
754
chunk_list, int num_chunks)
756
png_bytep new_list, p;
757
int i, old_num_chunks;
760
if(keep == HANDLE_CHUNK_ALWAYS || keep == HANDLE_CHUNK_IF_SAFE)
761
png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
763
png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
765
if(keep == HANDLE_CHUNK_ALWAYS)
766
png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
768
png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
771
if (chunk_list == NULL)
773
old_num_chunks=png_ptr->num_chunk_list;
774
new_list=png_malloc(png_ptr,5*(num_chunks+old_num_chunks));
775
if(png_ptr->chunk_list != (png_bytep)NULL)
777
png_memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
778
png_free(png_ptr, png_ptr->chunk_list);
779
png_ptr->chunk_list=NULL;
781
png_memcpy(new_list+5*old_num_chunks, chunk_list, 5*num_chunks);
782
for (p=new_list+5*old_num_chunks+4, i=0; i<num_chunks; i++, p+=5)
784
png_ptr->num_chunk_list=old_num_chunks+num_chunks;
785
png_ptr->chunk_list=new_list;
786
#ifdef PNG_FREE_ME_SUPPORTED
787
png_ptr->free_me |= PNG_FREE_LIST;
792
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
794
png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
795
png_user_chunk_ptr read_user_chunk_fn)
797
png_debug(1, "in png_set_read_user_chunk_fn\n");
798
png_ptr->read_user_chunk_fn = read_user_chunk_fn;
799
png_ptr->user_chunk_ptr = user_chunk_ptr;
803
#if defined(PNG_INFO_IMAGE_SUPPORTED)
805
png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
807
png_debug1(1, "in %s storage function\n", "rows");
809
if (png_ptr == NULL || info_ptr == NULL)
812
if(info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
813
png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
814
info_ptr->row_pointers = row_pointers;
816
info_ptr->valid |= PNG_INFO_IDAT;
822
png_set_compression_buffer_size(png_structp png_ptr, png_uint_32 size)
825
png_free(png_ptr, png_ptr->zbuf);
826
png_ptr->zbuf_size = (png_size_t)size;
827
png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
828
png_ptr->zstream.next_out = png_ptr->zbuf;
829
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
833
png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
835
if (png_ptr && info_ptr)
836
info_ptr->valid &= ~(mask);