2 /* pngset.c - storage of image information into info struct
4 * Last changed in libpng 1.2.24 [December 14, 2007]
5 * For conditions of distribution and use, see copyright notice in png.h
6 * Copyright (c) 1998-2007 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_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
21 #if defined(PNG_bKGD_SUPPORTED)
23 png_set_bKGD(png_structp png_ptr
, png_infop info_ptr
, png_color_16p background
)
25 png_debug1(1, "in %s storage function\n", "bKGD");
26 if (png_ptr
== NULL
|| info_ptr
== NULL
)
29 png_memcpy(&(info_ptr
->background
), background
, png_sizeof(png_color_16
));
30 info_ptr
->valid
|= PNG_INFO_bKGD
;
34 #if defined(PNG_cHRM_SUPPORTED)
35 #ifdef PNG_FLOATING_POINT_SUPPORTED
37 png_set_cHRM(png_structp png_ptr
, png_infop info_ptr
,
38 double white_x
, double white_y
, double red_x
, double red_y
,
39 double green_x
, double green_y
, double blue_x
, double blue_y
)
41 png_debug1(1, "in %s storage function\n", "cHRM");
42 if (png_ptr
== NULL
|| info_ptr
== NULL
)
44 if (!(white_x
|| white_y
|| red_x
|| red_y
|| green_x
|| green_y
||
48 "Ignoring attempt to set all-zero chromaticity values");
51 if (white_x
< 0.0 || white_y
< 0.0 ||
52 red_x
< 0.0 || red_y
< 0.0 ||
53 green_x
< 0.0 || green_y
< 0.0 ||
54 blue_x
< 0.0 || blue_y
< 0.0)
57 "Ignoring attempt to set negative chromaticity value");
60 if (white_x
> 21474.83 || white_y
> 21474.83 ||
61 red_x
> 21474.83 || red_y
> 21474.83 ||
62 green_x
> 21474.83 || green_y
> 21474.83 ||
63 blue_x
> 21474.83 || blue_y
> 21474.83)
66 "Ignoring attempt to set chromaticity value exceeding 21474.83");
70 info_ptr
->x_white
= (float)white_x
;
71 info_ptr
->y_white
= (float)white_y
;
72 info_ptr
->x_red
= (float)red_x
;
73 info_ptr
->y_red
= (float)red_y
;
74 info_ptr
->x_green
= (float)green_x
;
75 info_ptr
->y_green
= (float)green_y
;
76 info_ptr
->x_blue
= (float)blue_x
;
77 info_ptr
->y_blue
= (float)blue_y
;
78 #ifdef PNG_FIXED_POINT_SUPPORTED
79 info_ptr
->int_x_white
= (png_fixed_point
)(white_x
*100000.+0.5);
80 info_ptr
->int_y_white
= (png_fixed_point
)(white_y
*100000.+0.5);
81 info_ptr
->int_x_red
= (png_fixed_point
)( red_x
*100000.+0.5);
82 info_ptr
->int_y_red
= (png_fixed_point
)( red_y
*100000.+0.5);
83 info_ptr
->int_x_green
= (png_fixed_point
)(green_x
*100000.+0.5);
84 info_ptr
->int_y_green
= (png_fixed_point
)(green_y
*100000.+0.5);
85 info_ptr
->int_x_blue
= (png_fixed_point
)( blue_x
*100000.+0.5);
86 info_ptr
->int_y_blue
= (png_fixed_point
)( blue_y
*100000.+0.5);
88 info_ptr
->valid
|= PNG_INFO_cHRM
;
91 #ifdef PNG_FIXED_POINT_SUPPORTED
93 png_set_cHRM_fixed(png_structp png_ptr
, png_infop info_ptr
,
94 png_fixed_point white_x
, png_fixed_point white_y
, png_fixed_point red_x
,
95 png_fixed_point red_y
, png_fixed_point green_x
, png_fixed_point green_y
,
96 png_fixed_point blue_x
, png_fixed_point blue_y
)
98 png_debug1(1, "in %s storage function\n", "cHRM");
99 if (png_ptr
== NULL
|| info_ptr
== NULL
)
102 if (!(white_x
|| white_y
|| red_x
|| red_y
|| green_x
|| green_y
||
106 "Ignoring attempt to set all-zero chromaticity values");
109 if (white_x
< 0 || white_y
< 0 ||
110 red_x
< 0 || red_y
< 0 ||
111 green_x
< 0 || green_y
< 0 ||
112 blue_x
< 0 || blue_y
< 0)
115 "Ignoring attempt to set negative chromaticity value");
118 if (white_x
> (png_fixed_point
) PNG_UINT_31_MAX
||
119 white_y
> (png_fixed_point
) PNG_UINT_31_MAX
||
120 red_x
> (png_fixed_point
) PNG_UINT_31_MAX
||
121 red_y
> (png_fixed_point
) PNG_UINT_31_MAX
||
122 green_x
> (png_fixed_point
) PNG_UINT_31_MAX
||
123 green_y
> (png_fixed_point
) PNG_UINT_31_MAX
||
124 blue_x
> (png_fixed_point
) PNG_UINT_31_MAX
||
125 blue_y
> (png_fixed_point
) PNG_UINT_31_MAX
)
128 "Ignoring attempt to set chromaticity value exceeding 21474.83");
131 info_ptr
->int_x_white
= white_x
;
132 info_ptr
->int_y_white
= white_y
;
133 info_ptr
->int_x_red
= red_x
;
134 info_ptr
->int_y_red
= red_y
;
135 info_ptr
->int_x_green
= green_x
;
136 info_ptr
->int_y_green
= green_y
;
137 info_ptr
->int_x_blue
= blue_x
;
138 info_ptr
->int_y_blue
= blue_y
;
139 #ifdef PNG_FLOATING_POINT_SUPPORTED
140 info_ptr
->x_white
= (float)(white_x
/100000.);
141 info_ptr
->y_white
= (float)(white_y
/100000.);
142 info_ptr
->x_red
= (float)( red_x
/100000.);
143 info_ptr
->y_red
= (float)( red_y
/100000.);
144 info_ptr
->x_green
= (float)(green_x
/100000.);
145 info_ptr
->y_green
= (float)(green_y
/100000.);
146 info_ptr
->x_blue
= (float)( blue_x
/100000.);
147 info_ptr
->y_blue
= (float)( blue_y
/100000.);
149 info_ptr
->valid
|= PNG_INFO_cHRM
;
154 #if defined(PNG_gAMA_SUPPORTED)
155 #ifdef PNG_FLOATING_POINT_SUPPORTED
157 png_set_gAMA(png_structp png_ptr
, png_infop info_ptr
, double file_gamma
)
160 png_debug1(1, "in %s storage function\n", "gAMA");
161 if (png_ptr
== NULL
|| info_ptr
== NULL
)
164 /* Check for overflow */
165 if (file_gamma
> 21474.83)
167 png_warning(png_ptr
, "Limiting gamma to 21474.83");
172 info_ptr
->gamma
= (float)gamma
;
173 #ifdef PNG_FIXED_POINT_SUPPORTED
174 info_ptr
->int_gamma
= (int)(gamma
*100000.+.5);
176 info_ptr
->valid
|= PNG_INFO_gAMA
;
178 png_warning(png_ptr
, "Setting gamma=0");
182 png_set_gAMA_fixed(png_structp png_ptr
, png_infop info_ptr
, png_fixed_point
185 png_fixed_point gamma
;
187 png_debug1(1, "in %s storage function\n", "gAMA");
188 if (png_ptr
== NULL
|| info_ptr
== NULL
)
191 if (int_gamma
> (png_fixed_point
) PNG_UINT_31_MAX
)
193 png_warning(png_ptr
, "Limiting gamma to 21474.83");
194 gamma
=PNG_UINT_31_MAX
;
200 png_warning(png_ptr
, "Setting negative gamma to zero");
206 #ifdef PNG_FLOATING_POINT_SUPPORTED
207 info_ptr
->gamma
= (float)(gamma
/100000.);
209 #ifdef PNG_FIXED_POINT_SUPPORTED
210 info_ptr
->int_gamma
= gamma
;
212 info_ptr
->valid
|= PNG_INFO_gAMA
;
214 png_warning(png_ptr
, "Setting gamma=0");
218 #if defined(PNG_hIST_SUPPORTED)
220 png_set_hIST(png_structp png_ptr
, png_infop info_ptr
, png_uint_16p hist
)
224 png_debug1(1, "in %s storage function\n", "hIST");
225 if (png_ptr
== NULL
|| info_ptr
== NULL
)
227 if (info_ptr
->num_palette
== 0 || info_ptr
->num_palette
228 > PNG_MAX_PALETTE_LENGTH
)
231 "Invalid palette size, hIST allocation skipped.");
235 #ifdef PNG_FREE_ME_SUPPORTED
236 png_free_data(png_ptr
, info_ptr
, PNG_FREE_HIST
, 0);
238 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in version
240 png_ptr
->hist
= (png_uint_16p
)png_malloc_warn(png_ptr
,
241 (png_uint_32
)(PNG_MAX_PALETTE_LENGTH
* png_sizeof (png_uint_16
)));
242 if (png_ptr
->hist
== NULL
)
244 png_warning(png_ptr
, "Insufficient memory for hIST chunk data.");
248 for (i
= 0; i
< info_ptr
->num_palette
; i
++)
249 png_ptr
->hist
[i
] = hist
[i
];
250 info_ptr
->hist
= png_ptr
->hist
;
251 info_ptr
->valid
|= PNG_INFO_hIST
;
253 #ifdef PNG_FREE_ME_SUPPORTED
254 info_ptr
->free_me
|= PNG_FREE_HIST
;
256 png_ptr
->flags
|= PNG_FLAG_FREE_HIST
;
262 png_set_IHDR(png_structp png_ptr
, png_infop info_ptr
,
263 png_uint_32 width
, png_uint_32 height
, int bit_depth
,
264 int color_type
, int interlace_type
, int compression_type
,
267 png_debug1(1, "in %s storage function\n", "IHDR");
268 if (png_ptr
== NULL
|| info_ptr
== NULL
)
271 /* check for width and height valid values */
272 if (width
== 0 || height
== 0)
273 png_error(png_ptr
, "Image width or height is zero in IHDR");
274 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
275 if (width
> png_ptr
->user_width_max
|| height
> png_ptr
->user_height_max
)
276 png_error(png_ptr
, "image size exceeds user limits in IHDR");
278 if (width
> PNG_USER_WIDTH_MAX
|| height
> PNG_USER_HEIGHT_MAX
)
279 png_error(png_ptr
, "image size exceeds user limits in IHDR");
281 if (width
> PNG_UINT_31_MAX
|| height
> PNG_UINT_31_MAX
)
282 png_error(png_ptr
, "Invalid image size in IHDR");
283 if ( width
> (PNG_UINT_32_MAX
284 >> 3) /* 8-byte RGBA pixels */
285 - 64 /* bigrowbuf hack */
286 - 1 /* filter byte */
287 - 7*8 /* rounding of width to multiple of 8 pixels */
288 - 8) /* extra max_pixel_depth pad */
289 png_warning(png_ptr
, "Width is too large for libpng to process pixels");
291 /* check other values */
292 if (bit_depth
!= 1 && bit_depth
!= 2 && bit_depth
!= 4 &&
293 bit_depth
!= 8 && bit_depth
!= 16)
294 png_error(png_ptr
, "Invalid bit depth in IHDR");
296 if (color_type
< 0 || color_type
== 1 ||
297 color_type
== 5 || color_type
> 6)
298 png_error(png_ptr
, "Invalid color type in IHDR");
300 if (((color_type
== PNG_COLOR_TYPE_PALETTE
) && bit_depth
> 8) ||
301 ((color_type
== PNG_COLOR_TYPE_RGB
||
302 color_type
== PNG_COLOR_TYPE_GRAY_ALPHA
||
303 color_type
== PNG_COLOR_TYPE_RGB_ALPHA
) && bit_depth
< 8))
304 png_error(png_ptr
, "Invalid color type/bit depth combination in IHDR");
306 if (interlace_type
>= PNG_INTERLACE_LAST
)
307 png_error(png_ptr
, "Unknown interlace method in IHDR");
309 if (compression_type
!= PNG_COMPRESSION_TYPE_BASE
)
310 png_error(png_ptr
, "Unknown compression method in IHDR");
312 #if defined(PNG_MNG_FEATURES_SUPPORTED)
313 /* Accept filter_method 64 (intrapixel differencing) only if
314 * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
315 * 2. Libpng did not read a PNG signature (this filter_method is only
316 * used in PNG datastreams that are embedded in MNG datastreams) and
317 * 3. The application called png_permit_mng_features with a mask that
318 * included PNG_FLAG_MNG_FILTER_64 and
319 * 4. The filter_method is 64 and
320 * 5. The color_type is RGB or RGBA
322 if((png_ptr
->mode
&PNG_HAVE_PNG_SIGNATURE
)&&png_ptr
->mng_features_permitted
)
323 png_warning(png_ptr
,"MNG features are not allowed in a PNG datastream");
324 if(filter_type
!= PNG_FILTER_TYPE_BASE
)
326 if(!((png_ptr
->mng_features_permitted
& PNG_FLAG_MNG_FILTER_64
) &&
327 (filter_type
== PNG_INTRAPIXEL_DIFFERENCING
) &&
328 ((png_ptr
->mode
&PNG_HAVE_PNG_SIGNATURE
) == 0) &&
329 (color_type
== PNG_COLOR_TYPE_RGB
||
330 color_type
== PNG_COLOR_TYPE_RGB_ALPHA
)))
331 png_error(png_ptr
, "Unknown filter method in IHDR");
332 if(png_ptr
->mode
&PNG_HAVE_PNG_SIGNATURE
)
333 png_warning(png_ptr
, "Invalid filter method in IHDR");
336 if(filter_type
!= PNG_FILTER_TYPE_BASE
)
337 png_error(png_ptr
, "Unknown filter method in IHDR");
340 info_ptr
->width
= width
;
341 info_ptr
->height
= height
;
342 info_ptr
->bit_depth
= (png_byte
)bit_depth
;
343 info_ptr
->color_type
=(png_byte
) color_type
;
344 info_ptr
->compression_type
= (png_byte
)compression_type
;
345 info_ptr
->filter_type
= (png_byte
)filter_type
;
346 info_ptr
->interlace_type
= (png_byte
)interlace_type
;
347 if (info_ptr
->color_type
== PNG_COLOR_TYPE_PALETTE
)
348 info_ptr
->channels
= 1;
349 else if (info_ptr
->color_type
& PNG_COLOR_MASK_COLOR
)
350 info_ptr
->channels
= 3;
352 info_ptr
->channels
= 1;
353 if (info_ptr
->color_type
& PNG_COLOR_MASK_ALPHA
)
354 info_ptr
->channels
++;
355 info_ptr
->pixel_depth
= (png_byte
)(info_ptr
->channels
* info_ptr
->bit_depth
);
357 /* check for potential overflow */
358 if (width
> (PNG_UINT_32_MAX
359 >> 3) /* 8-byte RGBA pixels */
360 - 64 /* bigrowbuf hack */
361 - 1 /* filter byte */
362 - 7*8 /* rounding of width to multiple of 8 pixels */
363 - 8) /* extra max_pixel_depth pad */
364 info_ptr
->rowbytes
= (png_size_t
)0;
366 info_ptr
->rowbytes
= PNG_ROWBYTES(info_ptr
->pixel_depth
,width
);
369 #if defined(PNG_oFFs_SUPPORTED)
371 png_set_oFFs(png_structp png_ptr
, png_infop info_ptr
,
372 png_int_32 offset_x
, png_int_32 offset_y
, int unit_type
)
374 png_debug1(1, "in %s storage function\n", "oFFs");
375 if (png_ptr
== NULL
|| info_ptr
== NULL
)
378 info_ptr
->x_offset
= offset_x
;
379 info_ptr
->y_offset
= offset_y
;
380 info_ptr
->offset_unit_type
= (png_byte
)unit_type
;
381 info_ptr
->valid
|= PNG_INFO_oFFs
;
385 #if defined(PNG_pCAL_SUPPORTED)
387 png_set_pCAL(png_structp png_ptr
, png_infop info_ptr
,
388 png_charp purpose
, png_int_32 X0
, png_int_32 X1
, int type
, int nparams
,
389 png_charp units
, png_charpp params
)
394 png_debug1(1, "in %s storage function\n", "pCAL");
395 if (png_ptr
== NULL
|| info_ptr
== NULL
)
398 length
= png_strlen(purpose
) + 1;
399 png_debug1(3, "allocating purpose for info (%lu bytes)\n", length
);
400 info_ptr
->pcal_purpose
= (png_charp
)png_malloc_warn(png_ptr
, length
);
401 if (info_ptr
->pcal_purpose
== NULL
)
403 png_warning(png_ptr
, "Insufficient memory for pCAL purpose.");
406 png_memcpy(info_ptr
->pcal_purpose
, purpose
, (png_size_t
)length
);
408 png_debug(3, "storing X0, X1, type, and nparams in info\n");
409 info_ptr
->pcal_X0
= X0
;
410 info_ptr
->pcal_X1
= X1
;
411 info_ptr
->pcal_type
= (png_byte
)type
;
412 info_ptr
->pcal_nparams
= (png_byte
)nparams
;
414 length
= png_strlen(units
) + 1;
415 png_debug1(3, "allocating units for info (%lu bytes)\n", length
);
416 info_ptr
->pcal_units
= (png_charp
)png_malloc_warn(png_ptr
, length
);
417 if (info_ptr
->pcal_units
== NULL
)
419 png_warning(png_ptr
, "Insufficient memory for pCAL units.");
422 png_memcpy(info_ptr
->pcal_units
, units
, (png_size_t
)length
);
424 info_ptr
->pcal_params
= (png_charpp
)png_malloc_warn(png_ptr
,
425 (png_uint_32
)((nparams
+ 1) * png_sizeof(png_charp
)));
426 if (info_ptr
->pcal_params
== NULL
)
428 png_warning(png_ptr
, "Insufficient memory for pCAL params.");
432 info_ptr
->pcal_params
[nparams
] = NULL
;
434 for (i
= 0; i
< nparams
; i
++)
436 length
= png_strlen(params
[i
]) + 1;
437 png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i
, length
);
438 info_ptr
->pcal_params
[i
] = (png_charp
)png_malloc_warn(png_ptr
, length
);
439 if (info_ptr
->pcal_params
[i
] == NULL
)
441 png_warning(png_ptr
, "Insufficient memory for pCAL parameter.");
444 png_memcpy(info_ptr
->pcal_params
[i
], params
[i
], (png_size_t
)length
);
447 info_ptr
->valid
|= PNG_INFO_pCAL
;
448 #ifdef PNG_FREE_ME_SUPPORTED
449 info_ptr
->free_me
|= PNG_FREE_PCAL
;
454 #if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
455 #ifdef PNG_FLOATING_POINT_SUPPORTED
457 png_set_sCAL(png_structp png_ptr
, png_infop info_ptr
,
458 int unit
, double width
, double height
)
460 png_debug1(1, "in %s storage function\n", "sCAL");
461 if (png_ptr
== NULL
|| info_ptr
== NULL
)
464 info_ptr
->scal_unit
= (png_byte
)unit
;
465 info_ptr
->scal_pixel_width
= width
;
466 info_ptr
->scal_pixel_height
= height
;
468 info_ptr
->valid
|= PNG_INFO_sCAL
;
471 #ifdef PNG_FIXED_POINT_SUPPORTED
473 png_set_sCAL_s(png_structp png_ptr
, png_infop info_ptr
,
474 int unit
, png_charp swidth
, png_charp sheight
)
478 png_debug1(1, "in %s storage function\n", "sCAL");
479 if (png_ptr
== NULL
|| info_ptr
== NULL
)
482 info_ptr
->scal_unit
= (png_byte
)unit
;
484 length
= png_strlen(swidth
) + 1;
485 png_debug1(3, "allocating unit for info (%d bytes)\n", length
);
486 info_ptr
->scal_s_width
= (png_charp
)png_malloc_warn(png_ptr
, length
);
487 if (info_ptr
->scal_s_width
== NULL
)
490 "Memory allocation failed while processing sCAL.");
492 png_memcpy(info_ptr
->scal_s_width
, swidth
, (png_size_t
)length
);
494 length
= png_strlen(sheight
) + 1;
495 png_debug1(3, "allocating unit for info (%d bytes)\n", length
);
496 info_ptr
->scal_s_height
= (png_charp
)png_malloc_warn(png_ptr
, length
);
497 if (info_ptr
->scal_s_height
== NULL
)
499 png_free (png_ptr
, info_ptr
->scal_s_width
);
501 "Memory allocation failed while processing sCAL.");
503 png_memcpy(info_ptr
->scal_s_height
, sheight
, (png_size_t
)length
);
505 info_ptr
->valid
|= PNG_INFO_sCAL
;
506 #ifdef PNG_FREE_ME_SUPPORTED
507 info_ptr
->free_me
|= PNG_FREE_SCAL
;
514 #if defined(PNG_pHYs_SUPPORTED)
516 png_set_pHYs(png_structp png_ptr
, png_infop info_ptr
,
517 png_uint_32 res_x
, png_uint_32 res_y
, int unit_type
)
519 png_debug1(1, "in %s storage function\n", "pHYs");
520 if (png_ptr
== NULL
|| info_ptr
== NULL
)
523 info_ptr
->x_pixels_per_unit
= res_x
;
524 info_ptr
->y_pixels_per_unit
= res_y
;
525 info_ptr
->phys_unit_type
= (png_byte
)unit_type
;
526 info_ptr
->valid
|= PNG_INFO_pHYs
;
531 png_set_PLTE(png_structp png_ptr
, png_infop info_ptr
,
532 png_colorp palette
, int num_palette
)
535 png_debug1(1, "in %s storage function\n", "PLTE");
536 if (png_ptr
== NULL
|| info_ptr
== NULL
)
539 if (num_palette
< 0 || num_palette
> PNG_MAX_PALETTE_LENGTH
)
541 if (info_ptr
->color_type
== PNG_COLOR_TYPE_PALETTE
)
542 png_error(png_ptr
, "Invalid palette length");
545 png_warning(png_ptr
, "Invalid palette length");
551 * It may not actually be necessary to set png_ptr->palette here;
552 * we do it for backward compatibility with the way the png_handle_tRNS
553 * function used to do the allocation.
555 #ifdef PNG_FREE_ME_SUPPORTED
556 png_free_data(png_ptr
, info_ptr
, PNG_FREE_PLTE
, 0);
559 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
560 of num_palette entries,
561 in case of an invalid PNG file that has too-large sample values. */
562 png_ptr
->palette
= (png_colorp
)png_malloc(png_ptr
,
563 PNG_MAX_PALETTE_LENGTH
* png_sizeof(png_color
));
564 png_memset(png_ptr
->palette
, 0, PNG_MAX_PALETTE_LENGTH
*
565 png_sizeof(png_color
));
566 png_memcpy(png_ptr
->palette
, palette
, num_palette
* png_sizeof (png_color
));
567 info_ptr
->palette
= png_ptr
->palette
;
568 info_ptr
->num_palette
= png_ptr
->num_palette
= (png_uint_16
)num_palette
;
570 #ifdef PNG_FREE_ME_SUPPORTED
571 info_ptr
->free_me
|= PNG_FREE_PLTE
;
573 png_ptr
->flags
|= PNG_FLAG_FREE_PLTE
;
576 info_ptr
->valid
|= PNG_INFO_PLTE
;
579 #if defined(PNG_sBIT_SUPPORTED)
581 png_set_sBIT(png_structp png_ptr
, png_infop info_ptr
,
582 png_color_8p sig_bit
)
584 png_debug1(1, "in %s storage function\n", "sBIT");
585 if (png_ptr
== NULL
|| info_ptr
== NULL
)
588 png_memcpy(&(info_ptr
->sig_bit
), sig_bit
, png_sizeof (png_color_8
));
589 info_ptr
->valid
|= PNG_INFO_sBIT
;
593 #if defined(PNG_sRGB_SUPPORTED)
595 png_set_sRGB(png_structp png_ptr
, png_infop info_ptr
, int intent
)
597 png_debug1(1, "in %s storage function\n", "sRGB");
598 if (png_ptr
== NULL
|| info_ptr
== NULL
)
601 info_ptr
->srgb_intent
= (png_byte
)intent
;
602 info_ptr
->valid
|= PNG_INFO_sRGB
;
606 png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr
, png_infop info_ptr
,
609 #if defined(PNG_gAMA_SUPPORTED)
610 #ifdef PNG_FLOATING_POINT_SUPPORTED
613 #ifdef PNG_FIXED_POINT_SUPPORTED
614 png_fixed_point int_file_gamma
;
617 #if defined(PNG_cHRM_SUPPORTED)
618 #ifdef PNG_FLOATING_POINT_SUPPORTED
619 float white_x
, white_y
, red_x
, red_y
, green_x
, green_y
, blue_x
, blue_y
;
621 #ifdef PNG_FIXED_POINT_SUPPORTED
622 png_fixed_point int_white_x
, int_white_y
, int_red_x
, int_red_y
, int_green_x
,
623 int_green_y
, int_blue_x
, int_blue_y
;
626 png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");
627 if (png_ptr
== NULL
|| info_ptr
== NULL
)
630 png_set_sRGB(png_ptr
, info_ptr
, intent
);
632 #if defined(PNG_gAMA_SUPPORTED)
633 #ifdef PNG_FLOATING_POINT_SUPPORTED
634 file_gamma
= (float).45455;
635 png_set_gAMA(png_ptr
, info_ptr
, file_gamma
);
637 #ifdef PNG_FIXED_POINT_SUPPORTED
638 int_file_gamma
= 45455L;
639 png_set_gAMA_fixed(png_ptr
, info_ptr
, int_file_gamma
);
643 #if defined(PNG_cHRM_SUPPORTED)
644 #ifdef PNG_FIXED_POINT_SUPPORTED
645 int_white_x
= 31270L;
646 int_white_y
= 32900L;
649 int_green_x
= 30000L;
650 int_green_y
= 60000L;
654 png_set_cHRM_fixed(png_ptr
, info_ptr
,
655 int_white_x
, int_white_y
, int_red_x
, int_red_y
, int_green_x
, int_green_y
,
656 int_blue_x
, int_blue_y
);
658 #ifdef PNG_FLOATING_POINT_SUPPORTED
659 white_x
= (float).3127;
660 white_y
= (float).3290;
663 green_x
= (float).30;
664 green_y
= (float).60;
668 png_set_cHRM(png_ptr
, info_ptr
,
669 white_x
, white_y
, red_x
, red_y
, green_x
, green_y
, blue_x
, blue_y
);
676 #if defined(PNG_iCCP_SUPPORTED)
678 png_set_iCCP(png_structp png_ptr
, png_infop info_ptr
,
679 png_charp name
, int compression_type
,
680 png_charp profile
, png_uint_32 proflen
)
682 png_charp new_iccp_name
;
683 png_charp new_iccp_profile
;
686 png_debug1(1, "in %s storage function\n", "iCCP");
687 if (png_ptr
== NULL
|| info_ptr
== NULL
|| name
== NULL
|| profile
== NULL
)
690 length
= png_strlen(name
)+1;
691 new_iccp_name
= (png_charp
)png_malloc_warn(png_ptr
, length
);
692 if (new_iccp_name
== NULL
)
694 png_warning(png_ptr
, "Insufficient memory to process iCCP chunk.");
697 png_memcpy(new_iccp_name
, name
, length
);
698 new_iccp_profile
= (png_charp
)png_malloc_warn(png_ptr
, proflen
);
699 if (new_iccp_profile
== NULL
)
701 png_free (png_ptr
, new_iccp_name
);
702 png_warning(png_ptr
, "Insufficient memory to process iCCP profile.");
705 png_memcpy(new_iccp_profile
, profile
, (png_size_t
)proflen
);
707 png_free_data(png_ptr
, info_ptr
, PNG_FREE_ICCP
, 0);
709 info_ptr
->iccp_proflen
= proflen
;
710 info_ptr
->iccp_name
= new_iccp_name
;
711 info_ptr
->iccp_profile
= new_iccp_profile
;
712 /* Compression is always zero but is here so the API and info structure
713 * does not have to change if we introduce multiple compression types */
714 info_ptr
->iccp_compression
= (png_byte
)compression_type
;
715 #ifdef PNG_FREE_ME_SUPPORTED
716 info_ptr
->free_me
|= PNG_FREE_ICCP
;
718 info_ptr
->valid
|= PNG_INFO_iCCP
;
722 #if defined(PNG_TEXT_SUPPORTED)
724 png_set_text(png_structp png_ptr
, png_infop info_ptr
, png_textp text_ptr
,
728 ret
=png_set_text_2(png_ptr
, info_ptr
, text_ptr
, num_text
);
730 png_error(png_ptr
, "Insufficient memory to store text");
734 png_set_text_2(png_structp png_ptr
, png_infop info_ptr
, png_textp text_ptr
,
739 png_debug1(1, "in %s storage function\n", (png_ptr
->chunk_name
[0] == '\0' ?
740 "text" : (png_const_charp
)png_ptr
->chunk_name
));
742 if (png_ptr
== NULL
|| info_ptr
== NULL
|| num_text
== 0)
745 /* Make sure we have enough space in the "text" array in info_struct
746 * to hold all of the incoming text_ptr objects.
748 if (info_ptr
->num_text
+ num_text
> info_ptr
->max_text
)
750 if (info_ptr
->text
!= NULL
)
755 old_max
= info_ptr
->max_text
;
756 info_ptr
->max_text
= info_ptr
->num_text
+ num_text
+ 8;
757 old_text
= info_ptr
->text
;
758 info_ptr
->text
= (png_textp
)png_malloc_warn(png_ptr
,
759 (png_uint_32
)(info_ptr
->max_text
* png_sizeof (png_text
)));
760 if (info_ptr
->text
== NULL
)
762 png_free(png_ptr
, old_text
);
765 png_memcpy(info_ptr
->text
, old_text
, (png_size_t
)(old_max
*
766 png_sizeof(png_text
)));
767 png_free(png_ptr
, old_text
);
771 info_ptr
->max_text
= num_text
+ 8;
772 info_ptr
->num_text
= 0;
773 info_ptr
->text
= (png_textp
)png_malloc_warn(png_ptr
,
774 (png_uint_32
)(info_ptr
->max_text
* png_sizeof (png_text
)));
775 if (info_ptr
->text
== NULL
)
777 #ifdef PNG_FREE_ME_SUPPORTED
778 info_ptr
->free_me
|= PNG_FREE_TEXT
;
781 png_debug1(3, "allocated %d entries for info_ptr->text\n",
784 for (i
= 0; i
< num_text
; i
++)
786 png_size_t text_length
,key_len
;
787 png_size_t lang_len
,lang_key_len
;
788 png_textp textp
= &(info_ptr
->text
[info_ptr
->num_text
]);
790 if (text_ptr
[i
].key
== NULL
)
793 key_len
= png_strlen(text_ptr
[i
].key
);
795 if(text_ptr
[i
].compression
<= 0)
801 #ifdef PNG_iTXt_SUPPORTED
804 if (text_ptr
[i
].lang
!= NULL
)
805 lang_len
= png_strlen(text_ptr
[i
].lang
);
808 if (text_ptr
[i
].lang_key
!= NULL
)
809 lang_key_len
= png_strlen(text_ptr
[i
].lang_key
);
815 png_warning(png_ptr
, "iTXt chunk not supported.");
820 if (text_ptr
[i
].text
== NULL
|| text_ptr
[i
].text
[0] == '\0')
823 #ifdef PNG_iTXt_SUPPORTED
824 if(text_ptr
[i
].compression
> 0)
825 textp
->compression
= PNG_ITXT_COMPRESSION_NONE
;
828 textp
->compression
= PNG_TEXT_COMPRESSION_NONE
;
832 text_length
= png_strlen(text_ptr
[i
].text
);
833 textp
->compression
= text_ptr
[i
].compression
;
836 textp
->key
= (png_charp
)png_malloc_warn(png_ptr
,
837 (png_uint_32
)(key_len
+ text_length
+ lang_len
+ lang_key_len
+ 4));
838 if (textp
->key
== NULL
)
840 png_debug2(2, "Allocated %lu bytes at %x in png_set_text\n",
841 (png_uint_32
)(key_len
+ lang_len
+ lang_key_len
+ text_length
+ 4),
844 png_memcpy(textp
->key
, text_ptr
[i
].key
,
845 (png_size_t
)(key_len
));
846 *(textp
->key
+key_len
) = '\0';
847 #ifdef PNG_iTXt_SUPPORTED
848 if (text_ptr
[i
].compression
> 0)
850 textp
->lang
=textp
->key
+ key_len
+ 1;
851 png_memcpy(textp
->lang
, text_ptr
[i
].lang
, lang_len
);
852 *(textp
->lang
+lang_len
) = '\0';
853 textp
->lang_key
=textp
->lang
+ lang_len
+ 1;
854 png_memcpy(textp
->lang_key
, text_ptr
[i
].lang_key
, lang_key_len
);
855 *(textp
->lang_key
+lang_key_len
) = '\0';
856 textp
->text
=textp
->lang_key
+ lang_key_len
+ 1;
861 #ifdef PNG_iTXt_SUPPORTED
863 textp
->lang_key
=NULL
;
865 textp
->text
=textp
->key
+ key_len
+ 1;
868 png_memcpy(textp
->text
, text_ptr
[i
].text
,
869 (png_size_t
)(text_length
));
870 *(textp
->text
+text_length
) = '\0';
872 #ifdef PNG_iTXt_SUPPORTED
873 if(textp
->compression
> 0)
875 textp
->text_length
= 0;
876 textp
->itxt_length
= text_length
;
881 textp
->text_length
= text_length
;
882 #ifdef PNG_iTXt_SUPPORTED
883 textp
->itxt_length
= 0;
886 info_ptr
->num_text
++;
887 png_debug1(3, "transferred text chunk %d\n", info_ptr
->num_text
);
893 #if defined(PNG_tIME_SUPPORTED)
895 png_set_tIME(png_structp png_ptr
, png_infop info_ptr
, png_timep mod_time
)
897 png_debug1(1, "in %s storage function\n", "tIME");
898 if (png_ptr
== NULL
|| info_ptr
== NULL
||
899 (png_ptr
->mode
& PNG_WROTE_tIME
))
902 png_memcpy(&(info_ptr
->mod_time
), mod_time
, png_sizeof (png_time
));
903 info_ptr
->valid
|= PNG_INFO_tIME
;
907 #if defined(PNG_tRNS_SUPPORTED)
909 png_set_tRNS(png_structp png_ptr
, png_infop info_ptr
,
910 png_bytep trans
, int num_trans
, png_color_16p trans_values
)
912 png_debug1(1, "in %s storage function\n", "tRNS");
913 if (png_ptr
== NULL
|| info_ptr
== NULL
)
919 * It may not actually be necessary to set png_ptr->trans here;
920 * we do it for backward compatibility with the way the png_handle_tRNS
921 * function used to do the allocation.
923 #ifdef PNG_FREE_ME_SUPPORTED
924 png_free_data(png_ptr
, info_ptr
, PNG_FREE_TRNS
, 0);
926 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
927 png_ptr
->trans
= info_ptr
->trans
= (png_bytep
)png_malloc(png_ptr
,
928 (png_uint_32
)PNG_MAX_PALETTE_LENGTH
);
929 if (num_trans
<= PNG_MAX_PALETTE_LENGTH
)
930 png_memcpy(info_ptr
->trans
, trans
, (png_size_t
)num_trans
);
931 #ifdef PNG_FREE_ME_SUPPORTED
932 info_ptr
->free_me
|= PNG_FREE_TRNS
;
934 png_ptr
->flags
|= PNG_FLAG_FREE_TRNS
;
938 if (trans_values
!= NULL
)
940 png_memcpy(&(info_ptr
->trans_values
), trans_values
,
941 png_sizeof(png_color_16
));
945 info_ptr
->num_trans
= (png_uint_16
)num_trans
;
946 info_ptr
->valid
|= PNG_INFO_tRNS
;
950 #if defined(PNG_sPLT_SUPPORTED)
952 png_set_sPLT(png_structp png_ptr
,
953 png_infop info_ptr
, png_sPLT_tp entries
, int nentries
)
958 if (png_ptr
== NULL
|| info_ptr
== NULL
)
961 np
= (png_sPLT_tp
)png_malloc_warn(png_ptr
,
962 (info_ptr
->splt_palettes_num
+ nentries
) * png_sizeof(png_sPLT_t
));
965 png_warning(png_ptr
, "No memory for sPLT palettes.");
969 png_memcpy(np
, info_ptr
->splt_palettes
,
970 info_ptr
->splt_palettes_num
* png_sizeof(png_sPLT_t
));
971 png_free(png_ptr
, info_ptr
->splt_palettes
);
972 info_ptr
->splt_palettes
=NULL
;
974 for (i
= 0; i
< nentries
; i
++)
976 png_sPLT_tp to
= np
+ info_ptr
->splt_palettes_num
+ i
;
977 png_sPLT_tp from
= entries
+ i
;
980 length
= png_strlen(from
->name
) + 1;
981 to
->name
= (png_charp
)png_malloc_warn(png_ptr
, length
);
982 if (to
->name
== NULL
)
985 "Out of memory while processing sPLT chunk");
987 png_memcpy(to
->name
, from
->name
, length
);
988 to
->entries
= (png_sPLT_entryp
)png_malloc_warn(png_ptr
,
989 from
->nentries
* png_sizeof(png_sPLT_entry
));
990 if (to
->entries
== NULL
)
993 "Out of memory while processing sPLT chunk");
994 png_free(png_ptr
,to
->name
);
997 png_memcpy(to
->entries
, from
->entries
,
998 from
->nentries
* png_sizeof(png_sPLT_entry
));
999 to
->nentries
= from
->nentries
;
1000 to
->depth
= from
->depth
;
1003 info_ptr
->splt_palettes
= np
;
1004 info_ptr
->splt_palettes_num
+= nentries
;
1005 info_ptr
->valid
|= PNG_INFO_sPLT
;
1006 #ifdef PNG_FREE_ME_SUPPORTED
1007 info_ptr
->free_me
|= PNG_FREE_SPLT
;
1010 #endif /* PNG_sPLT_SUPPORTED */
1012 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1014 png_set_unknown_chunks(png_structp png_ptr
,
1015 png_infop info_ptr
, png_unknown_chunkp unknowns
, int num_unknowns
)
1017 png_unknown_chunkp np
;
1020 if (png_ptr
== NULL
|| info_ptr
== NULL
|| num_unknowns
== 0)
1023 np
= (png_unknown_chunkp
)png_malloc_warn(png_ptr
,
1024 (info_ptr
->unknown_chunks_num
+ num_unknowns
) *
1025 png_sizeof(png_unknown_chunk
));
1028 png_warning(png_ptr
,
1029 "Out of memory while processing unknown chunk.");
1033 png_memcpy(np
, info_ptr
->unknown_chunks
,
1034 info_ptr
->unknown_chunks_num
* png_sizeof(png_unknown_chunk
));
1035 png_free(png_ptr
, info_ptr
->unknown_chunks
);
1036 info_ptr
->unknown_chunks
=NULL
;
1038 for (i
= 0; i
< num_unknowns
; i
++)
1040 png_unknown_chunkp to
= np
+ info_ptr
->unknown_chunks_num
+ i
;
1041 png_unknown_chunkp from
= unknowns
+ i
;
1043 png_memcpy((png_charp
)to
->name
,
1044 (png_charp
)from
->name
,
1045 png_sizeof(from
->name
));
1046 to
->name
[png_sizeof(to
->name
)-1] = '\0';
1048 to
->data
= (png_bytep
)png_malloc_warn(png_ptr
, from
->size
);
1049 if (to
->data
== NULL
)
1051 png_warning(png_ptr
,
1052 "Out of memory while processing unknown chunk.");
1056 png_memcpy(to
->data
, from
->data
, from
->size
);
1057 to
->size
= from
->size
;
1059 /* note our location in the read or write sequence */
1060 to
->location
= (png_byte
)(png_ptr
->mode
& 0xff);
1064 info_ptr
->unknown_chunks
= np
;
1065 info_ptr
->unknown_chunks_num
+= num_unknowns
;
1066 #ifdef PNG_FREE_ME_SUPPORTED
1067 info_ptr
->free_me
|= PNG_FREE_UNKN
;
1071 png_set_unknown_chunk_location(png_structp png_ptr
, png_infop info_ptr
,
1072 int chunk
, int location
)
1074 if(png_ptr
!= NULL
&& info_ptr
!= NULL
&& chunk
>= 0 && chunk
<
1075 (int)info_ptr
->unknown_chunks_num
)
1076 info_ptr
->unknown_chunks
[chunk
].location
= (png_byte
)location
;
1080 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
1081 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1082 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1084 png_permit_empty_plte (png_structp png_ptr
, int empty_plte_permitted
)
1086 /* This function is deprecated in favor of png_permit_mng_features()
1087 and will be removed from libpng-1.3.0 */
1088 png_debug(1, "in png_permit_empty_plte, DEPRECATED.\n");
1089 if (png_ptr
== NULL
)
1091 png_ptr
->mng_features_permitted
= (png_byte
)
1092 ((png_ptr
->mng_features_permitted
& (~PNG_FLAG_MNG_EMPTY_PLTE
)) |
1093 ((empty_plte_permitted
& PNG_FLAG_MNG_EMPTY_PLTE
)));
1098 #if defined(PNG_MNG_FEATURES_SUPPORTED)
1100 png_permit_mng_features (png_structp png_ptr
, png_uint_32 mng_features
)
1102 png_debug(1, "in png_permit_mng_features\n");
1103 if (png_ptr
== NULL
)
1104 return (png_uint_32
)0;
1105 png_ptr
->mng_features_permitted
=
1106 (png_byte
)(mng_features
& PNG_ALL_MNG_FEATURES
);
1107 return (png_uint_32
)png_ptr
->mng_features_permitted
;
1111 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1113 png_set_keep_unknown_chunks(png_structp png_ptr
, int keep
, png_bytep
1114 chunk_list
, int num_chunks
)
1116 png_bytep new_list
, p
;
1117 int i
, old_num_chunks
;
1118 if (png_ptr
== NULL
)
1120 if (num_chunks
== 0)
1122 if(keep
== PNG_HANDLE_CHUNK_ALWAYS
|| keep
== PNG_HANDLE_CHUNK_IF_SAFE
)
1123 png_ptr
->flags
|= PNG_FLAG_KEEP_UNKNOWN_CHUNKS
;
1125 png_ptr
->flags
&= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS
;
1127 if(keep
== PNG_HANDLE_CHUNK_ALWAYS
)
1128 png_ptr
->flags
|= PNG_FLAG_KEEP_UNSAFE_CHUNKS
;
1130 png_ptr
->flags
&= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS
;
1133 if (chunk_list
== NULL
)
1135 old_num_chunks
=png_ptr
->num_chunk_list
;
1136 new_list
=(png_bytep
)png_malloc(png_ptr
,
1137 (png_uint_32
)(5*(num_chunks
+old_num_chunks
)));
1138 if(png_ptr
->chunk_list
!= NULL
)
1140 png_memcpy(new_list
, png_ptr
->chunk_list
,
1141 (png_size_t
)(5*old_num_chunks
));
1142 png_free(png_ptr
, png_ptr
->chunk_list
);
1143 png_ptr
->chunk_list
=NULL
;
1145 png_memcpy(new_list
+5*old_num_chunks
, chunk_list
,
1146 (png_size_t
)(5*num_chunks
));
1147 for (p
=new_list
+5*old_num_chunks
+4, i
=0; i
<num_chunks
; i
++, p
+=5)
1149 png_ptr
->num_chunk_list
=old_num_chunks
+num_chunks
;
1150 png_ptr
->chunk_list
=new_list
;
1151 #ifdef PNG_FREE_ME_SUPPORTED
1152 png_ptr
->free_me
|= PNG_FREE_LIST
;
1157 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
1159 png_set_read_user_chunk_fn(png_structp png_ptr
, png_voidp user_chunk_ptr
,
1160 png_user_chunk_ptr read_user_chunk_fn
)
1162 png_debug(1, "in png_set_read_user_chunk_fn\n");
1163 if (png_ptr
== NULL
)
1165 png_ptr
->read_user_chunk_fn
= read_user_chunk_fn
;
1166 png_ptr
->user_chunk_ptr
= user_chunk_ptr
;
1170 #if defined(PNG_INFO_IMAGE_SUPPORTED)
1172 png_set_rows(png_structp png_ptr
, png_infop info_ptr
, png_bytepp row_pointers
)
1174 png_debug1(1, "in %s storage function\n", "rows");
1176 if (png_ptr
== NULL
|| info_ptr
== NULL
)
1179 if(info_ptr
->row_pointers
&& (info_ptr
->row_pointers
!= row_pointers
))
1180 png_free_data(png_ptr
, info_ptr
, PNG_FREE_ROWS
, 0);
1181 info_ptr
->row_pointers
= row_pointers
;
1183 info_ptr
->valid
|= PNG_INFO_IDAT
;
1187 #ifdef PNG_WRITE_SUPPORTED
1189 png_set_compression_buffer_size(png_structp png_ptr
, png_uint_32 size
)
1191 if (png_ptr
== NULL
)
1194 png_free(png_ptr
, png_ptr
->zbuf
);
1195 png_ptr
->zbuf_size
= (png_size_t
)size
;
1196 png_ptr
->zbuf
= (png_bytep
)png_malloc(png_ptr
, size
);
1197 png_ptr
->zstream
.next_out
= png_ptr
->zbuf
;
1198 png_ptr
->zstream
.avail_out
= (uInt
)png_ptr
->zbuf_size
;
1203 png_set_invalid(png_structp png_ptr
, png_infop info_ptr
, int mask
)
1205 if (png_ptr
&& info_ptr
)
1206 info_ptr
->valid
&= ~mask
;
1211 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
1212 /* function was added to libpng 1.2.0 and should always exist by default */
1214 png_set_asm_flags (png_structp png_ptr
, png_uint_32 asm_flags
)
1216 /* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
1217 if (png_ptr
!= NULL
)
1218 png_ptr
->asm_flags
= 0;
1221 /* this function was added to libpng 1.2.0 */
1223 png_set_mmx_thresholds (png_structp png_ptr
,
1224 png_byte mmx_bitdepth_threshold
,
1225 png_uint_32 mmx_rowbytes_threshold
)
1227 /* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
1228 if (png_ptr
== NULL
)
1231 #endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
1233 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1234 /* this function was added to libpng 1.2.6 */
1236 png_set_user_limits (png_structp png_ptr
, png_uint_32 user_width_max
,
1237 png_uint_32 user_height_max
)
1239 /* Images with dimensions larger than these limits will be
1240 * rejected by png_set_IHDR(). To accept any PNG datastream
1241 * regardless of dimensions, set both limits to 0x7ffffffL.
1243 if(png_ptr
== NULL
) return;
1244 png_ptr
->user_width_max
= user_width_max
;
1245 png_ptr
->user_height_max
= user_height_max
;
1247 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
1249 #endif /* ?PNG_1_0_X */
1250 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */