/* pngset.c - storage of image information into info struct
*
- * Last changed in libpng 1.5.6 [November 3, 2011]
- * Copyright (c) 1998-2011 Glenn Randers-Pehrson
+ * Last changed in libpng 1.6.2 [April 25, 2013]
+ * Copyright (c) 1998-2013 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
#ifdef PNG_bKGD_SUPPORTED
void PNGAPI
-png_set_bKGD(png_structp png_ptr, png_infop info_ptr,
+png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,
png_const_color_16p background)
{
png_debug1(1, "in %s storage function", "bKGD");
- if (png_ptr == NULL || info_ptr == NULL)
+ if (png_ptr == NULL || info_ptr == NULL || background == NULL)
return;
- png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16));
+ info_ptr->background = *background;
info_ptr->valid |= PNG_INFO_bKGD;
}
#endif
#ifdef PNG_cHRM_SUPPORTED
void PNGFAPI
-png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
+png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
png_fixed_point blue_x, png_fixed_point blue_y)
{
+ png_xy xy;
+
png_debug1(1, "in %s storage function", "cHRM fixed");
if (png_ptr == NULL || info_ptr == NULL)
return;
-# ifdef PNG_CHECK_cHRM_SUPPORTED
- if (png_check_cHRM_fixed(png_ptr,
- white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y))
-# endif
- {
- info_ptr->x_white = white_x;
- info_ptr->y_white = white_y;
- info_ptr->x_red = red_x;
- info_ptr->y_red = red_y;
- info_ptr->x_green = green_x;
- info_ptr->y_green = green_y;
- info_ptr->x_blue = blue_x;
- info_ptr->y_blue = blue_y;
- info_ptr->valid |= PNG_INFO_cHRM;
- }
+ xy.redx = red_x;
+ xy.redy = red_y;
+ xy.greenx = green_x;
+ xy.greeny = green_y;
+ xy.bluex = blue_x;
+ xy.bluey = blue_y;
+ xy.whitex = white_x;
+ xy.whitey = white_y;
+
+ if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy,
+ 2/* override with app values*/))
+ info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
+
+ png_colorspace_sync_info(png_ptr, info_ptr);
}
void PNGFAPI
-png_set_cHRM_XYZ_fixed(png_structp png_ptr, png_infop info_ptr,
+png_set_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
png_fixed_point int_red_X, png_fixed_point int_red_Y,
png_fixed_point int_red_Z, png_fixed_point int_green_X,
png_fixed_point int_green_Y, png_fixed_point int_green_Z,
png_fixed_point int_blue_Z)
{
png_XYZ XYZ;
- png_xy xy;
png_debug1(1, "in %s storage function", "cHRM XYZ fixed");
if (png_ptr == NULL || info_ptr == NULL)
return;
- XYZ.redX = int_red_X;
- XYZ.redY = int_red_Y;
- XYZ.redZ = int_red_Z;
- XYZ.greenX = int_green_X;
- XYZ.greenY = int_green_Y;
- XYZ.greenZ = int_green_Z;
- XYZ.blueX = int_blue_X;
- XYZ.blueY = int_blue_Y;
- XYZ.blueZ = int_blue_Z;
-
- if (png_xy_from_XYZ(&xy, XYZ))
- png_error(png_ptr, "XYZ values out of representable range");
-
- png_set_cHRM_fixed(png_ptr, info_ptr, xy.whitex, xy.whitey, xy.redx, xy.redy,
- xy.greenx, xy.greeny, xy.bluex, xy.bluey);
+ XYZ.red_X = int_red_X;
+ XYZ.red_Y = int_red_Y;
+ XYZ.red_Z = int_red_Z;
+ XYZ.green_X = int_green_X;
+ XYZ.green_Y = int_green_Y;
+ XYZ.green_Z = int_green_Z;
+ XYZ.blue_X = int_blue_X;
+ XYZ.blue_Y = int_blue_Y;
+ XYZ.blue_Z = int_blue_Z;
+
+ if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace, &XYZ, 2))
+ info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
+
+ png_colorspace_sync_info(png_ptr, info_ptr);
}
# ifdef PNG_FLOATING_POINT_SUPPORTED
void PNGAPI
-png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
+png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
double white_x, double white_y, double red_x, double red_y,
double green_x, double green_y, double blue_x, double blue_y)
{
}
void PNGAPI
-png_set_cHRM_XYZ(png_structp png_ptr, png_infop info_ptr, double red_X,
+png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X,
double red_Y, double red_Z, double green_X, double green_Y, double green_Z,
double blue_X, double blue_Y, double blue_Z)
{
#ifdef PNG_gAMA_SUPPORTED
void PNGFAPI
-png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
- file_gamma)
+png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
+ png_fixed_point file_gamma)
{
png_debug1(1, "in %s storage function", "gAMA");
if (png_ptr == NULL || info_ptr == NULL)
return;
- /* Changed in libpng-1.5.4 to limit the values to ensure overflow can't
- * occur. Since the fixed point representation is assymetrical it is
- * possible for 1/gamma to overflow the limit of 21474 and this means the
- * gamma value must be at least 5/100000 and hence at most 20000.0. For
- * safety the limits here are a little narrower. The values are 0.00016 to
- * 6250.0, which are truly ridiculous gammma values (and will produce
- * displays that are all black or all white.)
- */
- if (file_gamma < 16 || file_gamma > 625000000)
- png_warning(png_ptr, "Out of range gamma value ignored");
-
- else
- {
- info_ptr->gamma = file_gamma;
- info_ptr->valid |= PNG_INFO_gAMA;
- }
+ png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma);
+ png_colorspace_sync_info(png_ptr, info_ptr);
}
# ifdef PNG_FLOATING_POINT_SUPPORTED
void PNGAPI
-png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
+png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma)
{
png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma,
"png_set_gAMA"));
#ifdef PNG_hIST_SUPPORTED
void PNGAPI
-png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_const_uint_16p hist)
+png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
+ png_const_uint_16p hist)
{
int i;
/* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
* version 1.2.1
*/
- png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
- PNG_MAX_PALETTE_LENGTH * png_sizeof(png_uint_16));
+ info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr,
+ PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16))));
- if (png_ptr->hist == NULL)
+ if (info_ptr->hist == NULL)
{
png_warning(png_ptr, "Insufficient memory for hIST chunk data");
return;
}
+ info_ptr->free_me |= PNG_FREE_HIST;
+
for (i = 0; i < info_ptr->num_palette; i++)
- png_ptr->hist[i] = hist[i];
+ info_ptr->hist[i] = hist[i];
- info_ptr->hist = png_ptr->hist;
info_ptr->valid |= PNG_INFO_hIST;
- info_ptr->free_me |= PNG_FREE_HIST;
}
#endif
void PNGAPI
-png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
+png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr,
png_uint_32 width, png_uint_32 height, int bit_depth,
int color_type, int interlace_type, int compression_type,
int filter_type)
#ifdef PNG_oFFs_SUPPORTED
void PNGAPI
-png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
+png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr,
png_int_32 offset_x, png_int_32 offset_y, int unit_type)
{
png_debug1(1, "in %s storage function", "oFFs");
#ifdef PNG_pCAL_SUPPORTED
void PNGAPI
-png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
+png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
int nparams, png_const_charp units, png_charpp params)
{
png_debug1(1, "in %s storage function", "pCAL");
- if (png_ptr == NULL || info_ptr == NULL)
+ if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL
+ || (nparams > 0 && params == NULL))
return;
- length = png_strlen(purpose) + 1;
+ length = strlen(purpose) + 1;
png_debug1(3, "allocating purpose for info (%lu bytes)",
(unsigned long)length);
if (type < 0 || type > 3)
png_error(png_ptr, "Invalid pCAL equation type");
+ if (nparams < 0 || nparams > 255)
+ png_error(png_ptr, "Invalid pCAL parameter count");
+
/* Validate params[nparams] */
for (i=0; i<nparams; ++i)
- if (!png_check_fp_string(params[i], png_strlen(params[i])))
+ if (params[i] == NULL ||
+ !png_check_fp_string(params[i], strlen(params[i])))
png_error(png_ptr, "Invalid format for pCAL parameter");
- info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length);
+ info_ptr->pcal_purpose = png_voidcast(png_charp,
+ png_malloc_warn(png_ptr, length));
if (info_ptr->pcal_purpose == NULL)
{
return;
}
- png_memcpy(info_ptr->pcal_purpose, purpose, length);
+ memcpy(info_ptr->pcal_purpose, purpose, length);
png_debug(3, "storing X0, X1, type, and nparams in info");
info_ptr->pcal_X0 = X0;
info_ptr->pcal_type = (png_byte)type;
info_ptr->pcal_nparams = (png_byte)nparams;
- length = png_strlen(units) + 1;
+ length = strlen(units) + 1;
png_debug1(3, "allocating units for info (%lu bytes)",
(unsigned long)length);
- info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);
+ info_ptr->pcal_units = png_voidcast(png_charp,
+ png_malloc_warn(png_ptr, length));
if (info_ptr->pcal_units == NULL)
{
return;
}
- png_memcpy(info_ptr->pcal_units, units, length);
+ memcpy(info_ptr->pcal_units, units, length);
- info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,
- (png_size_t)((nparams + 1) * png_sizeof(png_charp)));
+ info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
+ (png_size_t)((nparams + 1) * (sizeof (png_charp)))));
if (info_ptr->pcal_params == NULL)
{
return;
}
- png_memset(info_ptr->pcal_params, 0, (nparams + 1) * png_sizeof(png_charp));
+ memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp)));
for (i = 0; i < nparams; i++)
{
- length = png_strlen(params[i]) + 1;
+ length = strlen(params[i]) + 1;
png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
(unsigned long)length);
return;
}
- png_memcpy(info_ptr->pcal_params[i], params[i], length);
+ memcpy(info_ptr->pcal_params[i], params[i], length);
}
info_ptr->valid |= PNG_INFO_pCAL;
#ifdef PNG_sCAL_SUPPORTED
void PNGAPI
-png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
+png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
int unit, png_const_charp swidth, png_const_charp sheight)
{
png_size_t lengthw = 0, lengthh = 0;
if (unit != 1 && unit != 2)
png_error(png_ptr, "Invalid sCAL unit");
- if (swidth == NULL || (lengthw = png_strlen(swidth)) == 0 ||
+ if (swidth == NULL || (lengthw = strlen(swidth)) == 0 ||
swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
png_error(png_ptr, "Invalid sCAL width");
- if (sheight == NULL || (lengthh = png_strlen(sheight)) == 0 ||
+ if (sheight == NULL || (lengthh = strlen(sheight)) == 0 ||
sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
png_error(png_ptr, "Invalid sCAL height");
png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);
- info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, lengthw);
+ info_ptr->scal_s_width = png_voidcast(png_charp,
+ png_malloc_warn(png_ptr, lengthw));
if (info_ptr->scal_s_width == NULL)
{
return;
}
- png_memcpy(info_ptr->scal_s_width, swidth, lengthw);
+ memcpy(info_ptr->scal_s_width, swidth, lengthw);
++lengthh;
png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);
- info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, lengthh);
+ info_ptr->scal_s_height = png_voidcast(png_charp,
+ png_malloc_warn(png_ptr, lengthh));
if (info_ptr->scal_s_height == NULL)
{
return;
}
- png_memcpy(info_ptr->scal_s_height, sheight, lengthh);
+ memcpy(info_ptr->scal_s_height, sheight, lengthh);
info_ptr->valid |= PNG_INFO_sCAL;
info_ptr->free_me |= PNG_FREE_SCAL;
# ifdef PNG_FLOATING_POINT_SUPPORTED
void PNGAPI
-png_set_sCAL(png_structp png_ptr, png_infop info_ptr, int unit, double width,
- double height)
+png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
+ double width, double height)
{
png_debug1(1, "in %s storage function", "sCAL");
char swidth[PNG_sCAL_MAX_DIGITS+1];
char sheight[PNG_sCAL_MAX_DIGITS+1];
- png_ascii_from_fp(png_ptr, swidth, sizeof swidth, width,
+ png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width,
PNG_sCAL_PRECISION);
- png_ascii_from_fp(png_ptr, sheight, sizeof sheight, height,
+ png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height,
PNG_sCAL_PRECISION);
png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
# ifdef PNG_FIXED_POINT_SUPPORTED
void PNGAPI
-png_set_sCAL_fixed(png_structp png_ptr, png_infop info_ptr, int unit,
+png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
png_fixed_point width, png_fixed_point height)
{
png_debug1(1, "in %s storage function", "sCAL");
char swidth[PNG_sCAL_MAX_DIGITS+1];
char sheight[PNG_sCAL_MAX_DIGITS+1];
- png_ascii_from_fixed(png_ptr, swidth, sizeof swidth, width);
- png_ascii_from_fixed(png_ptr, sheight, sizeof sheight, height);
+ png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width);
+ png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height);
png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
}
#ifdef PNG_pHYs_SUPPORTED
void PNGAPI
-png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
+png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr,
png_uint_32 res_x, png_uint_32 res_y, int unit_type)
{
png_debug1(1, "in %s storage function", "pHYs");
#endif
void PNGAPI
-png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
+png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
png_const_colorp palette, int num_palette)
{
}
}
+ if ((num_palette > 0 && palette == NULL) ||
+ (num_palette == 0
+# ifdef PNG_MNG_FEATURES_SUPPORTED
+ && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
+# endif
+ ))
+ {
+ png_chunk_report(png_ptr, "Invalid palette", PNG_CHUNK_ERROR);
+ return;
+ }
+
/* It may not actually be necessary to set png_ptr->palette here;
* we do it for backward compatibility with the way the png_handle_tRNS
* function used to do the allocation.
+ *
+ * 1.6.0: the above statement appears to be incorrect; something has to set
+ * the palette inside png_struct on read.
*/
png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
* of num_palette entries, in case of an invalid PNG file that has
* too-large sample values.
*/
- png_ptr->palette = (png_colorp)png_calloc(png_ptr,
- PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color));
+ png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
+ PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
- png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof(png_color));
+ if (num_palette > 0)
+ memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color)));
info_ptr->palette = png_ptr->palette;
info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
#ifdef PNG_sBIT_SUPPORTED
void PNGAPI
-png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
+png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
png_const_color_8p sig_bit)
{
png_debug1(1, "in %s storage function", "sBIT");
- if (png_ptr == NULL || info_ptr == NULL)
+ if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL)
return;
- png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof(png_color_8));
+ info_ptr->sig_bit = *sig_bit;
info_ptr->valid |= PNG_INFO_sBIT;
}
#endif
#ifdef PNG_sRGB_SUPPORTED
void PNGAPI
-png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int srgb_intent)
+png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
{
png_debug1(1, "in %s storage function", "sRGB");
if (png_ptr == NULL || info_ptr == NULL)
return;
- info_ptr->srgb_intent = (png_byte)srgb_intent;
- info_ptr->valid |= PNG_INFO_sRGB;
+ (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent);
+ png_colorspace_sync_info(png_ptr, info_ptr);
}
void PNGAPI
-png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
+png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
int srgb_intent)
{
png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
if (png_ptr == NULL || info_ptr == NULL)
return;
- png_set_sRGB(png_ptr, info_ptr, srgb_intent);
-
-# ifdef PNG_gAMA_SUPPORTED
- png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_sRGB_INVERSE);
-# endif
+ if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent))
+ {
+ /* This causes the gAMA and cHRM to be written too */
+ info_ptr->colorspace.flags |=
+ PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
+ }
-# ifdef PNG_cHRM_SUPPORTED
- png_set_cHRM_fixed(png_ptr, info_ptr,
- /* color x y */
- /* white */ 31270, 32900,
- /* red */ 64000, 33000,
- /* green */ 30000, 60000,
- /* blue */ 15000, 6000
- );
-# endif /* cHRM */
+ png_colorspace_sync_info(png_ptr, info_ptr);
}
#endif /* sRGB */
#ifdef PNG_iCCP_SUPPORTED
void PNGAPI
-png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
+png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
png_const_charp name, int compression_type,
png_const_bytep profile, png_uint_32 proflen)
{
if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
return;
- length = png_strlen(name)+1;
- new_iccp_name = (png_charp)png_malloc_warn(png_ptr, length);
+ if (compression_type != PNG_COMPRESSION_TYPE_BASE)
+ png_app_error(png_ptr, "Invalid iCCP compression method");
+
+ /* Set the colorspace first because this validates the profile; do not
+ * override previously set app cHRM or gAMA here (because likely as not the
+ * application knows better than libpng what the correct values are.) Pass
+ * the info_ptr color_type field to png_colorspace_set_ICC because in the
+ * write case it has not yet been stored in png_ptr.
+ */
+ {
+ int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,
+ proflen, profile, info_ptr->color_type);
+
+ png_colorspace_sync_info(png_ptr, info_ptr);
+
+ /* Don't do any of the copying if the profile was bad, or inconsistent. */
+ if (!result)
+ return;
+
+ /* But do write the gAMA and cHRM chunks from the profile. */
+ info_ptr->colorspace.flags |=
+ PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
+ }
+
+ length = strlen(name)+1;
+ new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));
if (new_iccp_name == NULL)
{
- png_warning(png_ptr, "Insufficient memory to process iCCP chunk");
+ png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");
return;
}
- png_memcpy(new_iccp_name, name, length);
- new_iccp_profile = (png_bytep)png_malloc_warn(png_ptr, proflen);
+ memcpy(new_iccp_name, name, length);
+ new_iccp_profile = png_voidcast(png_bytep,
+ png_malloc_warn(png_ptr, proflen));
if (new_iccp_profile == NULL)
{
- png_free (png_ptr, new_iccp_name);
- png_warning(png_ptr,
+ png_free(png_ptr, new_iccp_name);
+ png_benign_error(png_ptr,
"Insufficient memory to process iCCP profile");
return;
}
- png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
+ memcpy(new_iccp_profile, profile, proflen);
png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
info_ptr->iccp_proflen = proflen;
info_ptr->iccp_name = new_iccp_name;
info_ptr->iccp_profile = new_iccp_profile;
- /* Compression is always zero but is here so the API and info structure
- * does not have to change if we introduce multiple compression types
- */
- info_ptr->iccp_compression = (png_byte)compression_type;
info_ptr->free_me |= PNG_FREE_ICCP;
info_ptr->valid |= PNG_INFO_iCCP;
}
#ifdef PNG_TEXT_SUPPORTED
void PNGAPI
-png_set_text(png_structp png_ptr, png_infop info_ptr, png_const_textp text_ptr,
- int num_text)
+png_set_text(png_const_structrp png_ptr, png_inforp info_ptr,
+ png_const_textp text_ptr, int num_text)
{
int ret;
ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
}
int /* PRIVATE */
-png_set_text_2(png_structp png_ptr, png_infop info_ptr,
+png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,
png_const_textp text_ptr, int num_text)
{
int i;
png_debug1(1, "in %lx storage function", png_ptr == NULL ? "unexpected" :
(unsigned long)png_ptr->chunk_name);
- if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
+ if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL)
return(0);
/* Make sure we have enough space in the "text" array in info_struct
- * to hold all of the incoming text_ptr objects.
+ * to hold all of the incoming text_ptr objects. This compare can't overflow
+ * because max_text >= num_text (anyway, subtract of two positive integers
+ * can't overflow in any case.)
*/
- if (info_ptr->num_text + num_text > info_ptr->max_text)
+ if (num_text > info_ptr->max_text - info_ptr->num_text)
{
- if (info_ptr->text != NULL)
+ int old_num_text = info_ptr->num_text;
+ int max_text;
+ png_textp new_text = NULL;
+
+ /* Calculate an appropriate max_text, checking for overflow. */
+ max_text = old_num_text;
+ if (num_text <= INT_MAX - max_text)
{
- png_textp old_text;
- int old_max;
+ max_text += num_text;
- old_max = info_ptr->max_text;
- info_ptr->max_text = info_ptr->num_text + num_text + 8;
- old_text = info_ptr->text;
- info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
- (png_size_t)(info_ptr->max_text * png_sizeof(png_text)));
+ /* Round up to a multiple of 8 */
+ if (max_text < INT_MAX-8)
+ max_text = (max_text + 8) & ~0x7;
- if (info_ptr->text == NULL)
- {
- png_free(png_ptr, old_text);
- return(1);
- }
-
- png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
- png_sizeof(png_text)));
- png_free(png_ptr, old_text);
+ else
+ max_text = INT_MAX;
+
+ /* Now allocate a new array and copy the old members in, this does all
+ * the overflow checks.
+ */
+ new_text = png_voidcast(png_textp,png_realloc_array(png_ptr,
+ info_ptr->text, old_num_text, max_text-old_num_text,
+ sizeof *new_text));
}
- else
+ if (new_text == NULL)
{
- info_ptr->max_text = num_text + 8;
- info_ptr->num_text = 0;
- info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
- (png_size_t)(info_ptr->max_text * png_sizeof(png_text)));
- if (info_ptr->text == NULL)
- return(1);
- info_ptr->free_me |= PNG_FREE_TEXT;
+ png_chunk_report(png_ptr, "too many text chunks",
+ PNG_CHUNK_WRITE_ERROR);
+ return 1;
}
- png_debug1(3, "allocated %d entries for info_ptr->text",
- info_ptr->max_text);
+ png_free(png_ptr, info_ptr->text);
+
+ info_ptr->text = new_text;
+ info_ptr->free_me |= PNG_FREE_TEXT;
+ info_ptr->max_text = max_text;
+ /* num_text is adjusted below as the entries are copied in */
+
+ png_debug1(3, "allocated %d entries for info_ptr->text", max_text);
}
+
for (i = 0; i < num_text; i++)
{
- png_size_t text_length, key_len;
- png_size_t lang_len, lang_key_len;
+ size_t text_length, key_len;
+ size_t lang_len, lang_key_len;
png_textp textp = &(info_ptr->text[info_ptr->num_text]);
if (text_ptr[i].key == NULL)
if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
{
- png_warning(png_ptr, "text compression mode is out of range");
+ png_chunk_report(png_ptr, "text compression mode is out of range",
+ PNG_CHUNK_WRITE_ERROR);
continue;
}
- key_len = png_strlen(text_ptr[i].key);
+ key_len = strlen(text_ptr[i].key);
if (text_ptr[i].compression <= 0)
{
/* Set iTXt data */
if (text_ptr[i].lang != NULL)
- lang_len = png_strlen(text_ptr[i].lang);
+ lang_len = strlen(text_ptr[i].lang);
else
lang_len = 0;
if (text_ptr[i].lang_key != NULL)
- lang_key_len = png_strlen(text_ptr[i].lang_key);
+ lang_key_len = strlen(text_ptr[i].lang_key);
else
lang_key_len = 0;
}
# else /* PNG_iTXt_SUPPORTED */
{
- png_warning(png_ptr, "iTXt chunk not supported");
+ png_chunk_report(png_ptr, "iTXt chunk not supported",
+ PNG_CHUNK_WRITE_ERROR);
continue;
}
# endif
else
{
- text_length = png_strlen(text_ptr[i].text);
+ text_length = strlen(text_ptr[i].text);
textp->compression = text_ptr[i].compression;
}
- textp->key = (png_charp)png_malloc_warn(png_ptr,
- (png_size_t)
- (key_len + text_length + lang_len + lang_key_len + 4));
+ textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr,
+ key_len + text_length + lang_len + lang_key_len + 4));
if (textp->key == NULL)
- return(1);
+ {
+ png_chunk_report(png_ptr, "text chunk: out of memory",
+ PNG_CHUNK_WRITE_ERROR);
+ return 1;
+ }
png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
(unsigned long)(png_uint_32)
(key_len + lang_len + lang_key_len + text_length + 4),
textp->key);
- png_memcpy(textp->key, text_ptr[i].key,(png_size_t)(key_len));
+ memcpy(textp->key, text_ptr[i].key, key_len);
*(textp->key + key_len) = '\0';
if (text_ptr[i].compression > 0)
{
textp->lang = textp->key + key_len + 1;
- png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
+ memcpy(textp->lang, text_ptr[i].lang, lang_len);
*(textp->lang + lang_len) = '\0';
textp->lang_key = textp->lang + lang_len + 1;
- png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
+ memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
*(textp->lang_key + lang_key_len) = '\0';
textp->text = textp->lang_key + lang_key_len + 1;
}
}
if (text_length)
- png_memcpy(textp->text, text_ptr[i].text,
- (png_size_t)(text_length));
+ memcpy(textp->text, text_ptr[i].text, text_length);
*(textp->text + text_length) = '\0';
info_ptr->num_text++;
png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
}
+
return(0);
}
#endif
#ifdef PNG_tIME_SUPPORTED
void PNGAPI
-png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_const_timep mod_time)
+png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
+ png_const_timep mod_time)
{
png_debug1(1, "in %s storage function", "tIME");
- if (png_ptr == NULL || info_ptr == NULL ||
+ if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL ||
(png_ptr->mode & PNG_WROTE_tIME))
return;
- png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof(png_time));
+ if (mod_time->month == 0 || mod_time->month > 12 ||
+ mod_time->day == 0 || mod_time->day > 31 ||
+ mod_time->hour > 23 || mod_time->minute > 59 ||
+ mod_time->second > 60)
+ {
+ png_warning(png_ptr, "Ignoring invalid time value");
+ return;
+ }
+
+ info_ptr->mod_time = *mod_time;
info_ptr->valid |= PNG_INFO_tIME;
}
#endif
#ifdef PNG_tRNS_SUPPORTED
void PNGAPI
-png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
+png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,
png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
{
png_debug1(1, "in %s storage function", "tRNS");
/* It may not actually be necessary to set png_ptr->trans_alpha here;
* we do it for backward compatibility with the way the png_handle_tRNS
* function used to do the allocation.
+ *
+ * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively
+ * relies on png_set_tRNS storing the information in png_struct
+ * (otherwise it won't be there for the code in pngrtran.c).
*/
png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
/* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
- png_ptr->trans_alpha = info_ptr->trans_alpha =
- (png_bytep)png_malloc(png_ptr, (png_size_t)PNG_MAX_PALETTE_LENGTH);
+ png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep,
+ png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
- png_memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
+ memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
}
if (trans_color != NULL)
int sample_max = (1 << info_ptr->bit_depth);
if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
- (int)trans_color->gray > sample_max) ||
+ trans_color->gray > sample_max) ||
(info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
- ((int)trans_color->red > sample_max ||
- (int)trans_color->green > sample_max ||
- (int)trans_color->blue > sample_max)))
+ (trans_color->red > sample_max ||
+ trans_color->green > sample_max ||
+ trans_color->blue > sample_max)))
png_warning(png_ptr,
"tRNS chunk has out-of-range samples for bit_depth");
- png_memcpy(&(info_ptr->trans_color), trans_color,
- png_sizeof(png_color_16));
+ info_ptr->trans_color = *trans_color;
if (num_trans == 0)
num_trans = 1;
#ifdef PNG_sPLT_SUPPORTED
void PNGAPI
-png_set_sPLT(png_structp png_ptr,
- png_infop info_ptr, png_const_sPLT_tp entries, int nentries)
+png_set_sPLT(png_const_structrp png_ptr,
+ png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)
/*
* entries - array of png_sPLT_t structures
* to be added to the list of palettes
*/
{
png_sPLT_tp np;
- int i;
- if (png_ptr == NULL || info_ptr == NULL)
+ if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL)
return;
- np = (png_sPLT_tp)png_malloc_warn(png_ptr,
- (info_ptr->splt_palettes_num + nentries) *
- (png_size_t)png_sizeof(png_sPLT_t));
+ /* Use the internal realloc function, which checks for all the possible
+ * overflows. Notice that the parameters are (int) and (size_t)
+ */
+ np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr,
+ info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries,
+ sizeof *np));
if (np == NULL)
{
- png_warning(png_ptr, "No memory for sPLT palettes");
+ /* Out of memory or too many chunks */
+ png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR);
return;
}
- png_memcpy(np, info_ptr->splt_palettes,
- info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));
-
png_free(png_ptr, info_ptr->splt_palettes);
- info_ptr->splt_palettes=NULL;
+ info_ptr->splt_palettes = np;
+ info_ptr->free_me |= PNG_FREE_SPLT;
- for (i = 0; i < nentries; i++)
+ np += info_ptr->splt_palettes_num;
+
+ do
{
- png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
- png_const_sPLT_tp from = entries + i;
png_size_t length;
- length = png_strlen(from->name) + 1;
- to->name = (png_charp)png_malloc_warn(png_ptr, length);
-
- if (to->name == NULL)
+ /* Skip invalid input entries */
+ if (entries->name == NULL || entries->entries == NULL)
{
- png_warning(png_ptr,
- "Out of memory while processing sPLT chunk");
+ /* png_handle_sPLT doesn't do this, so this is an app error */
+ png_app_error(png_ptr, "png_set_sPLT: invalid sPLT");
+ /* Just skip the invalid entry */
continue;
}
- png_memcpy(to->name, from->name, length);
- to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
- from->nentries * png_sizeof(png_sPLT_entry));
+ np->depth = entries->depth;
+
+ /* In the even of out-of-memory just return - there's no point keeping on
+ * trying to add sPLT chunks.
+ */
+ length = strlen(entries->name) + 1;
+ np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length));
+
+ if (np->name == NULL)
+ break;
+
+ memcpy(np->name, entries->name, length);
+
+ /* IMPORTANT: we have memory now that won't get freed if something else
+ * goes wrong, this code must free it. png_malloc_array produces no
+ * warnings, use a png_chunk_report (below) if there is an error.
+ */
+ np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr,
+ entries->nentries, sizeof (png_sPLT_entry)));
- if (to->entries == NULL)
+ if (np->entries == NULL)
{
- png_warning(png_ptr,
- "Out of memory while processing sPLT chunk");
- png_free(png_ptr, to->name);
- to->name = NULL;
- continue;
+ png_free(png_ptr, np->name);
+ break;
}
- png_memcpy(to->entries, from->entries,
- from->nentries * png_sizeof(png_sPLT_entry));
-
- to->nentries = from->nentries;
- to->depth = from->depth;
+ np->nentries = entries->nentries;
+ /* This multiply can't overflow because png_malloc_array has already
+ * checked it when doing the allocation.
+ */
+ memcpy(np->entries, entries->entries,
+ entries->nentries * sizeof (png_sPLT_entry));
+
+ /* Note that 'continue' skips the advance of the out pointer and out
+ * count, so an invalid entry is not added.
+ */
+ info_ptr->valid |= PNG_INFO_sPLT;
+ ++(info_ptr->splt_palettes_num);
+ ++np;
}
+ while (++entries, --nentries);
- info_ptr->splt_palettes = np;
- info_ptr->splt_palettes_num += nentries;
- info_ptr->valid |= PNG_INFO_sPLT;
- info_ptr->free_me |= PNG_FREE_SPLT;
+ if (nentries > 0)
+ png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
}
#endif /* PNG_sPLT_SUPPORTED */
-#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
+static png_byte
+check_location(png_const_structrp png_ptr, int location)
+{
+ location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);
+
+ /* New in 1.6.0; copy the location and check it. This is an API
+ * change, previously the app had to use the
+ * png_set_unknown_chunk_location API below for each chunk.
+ */
+ if (location == 0 && !(png_ptr->mode & PNG_IS_READ_STRUCT))
+ {
+ /* Write struct, so unknown chunks come from the app */
+ png_app_warning(png_ptr,
+ "png_set_unknown_chunks now expects a valid location");
+ /* Use the old behavior */
+ location = (png_byte)(png_ptr->mode &
+ (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT));
+ }
+
+ /* This need not be an internal error - if the app calls
+ * png_set_unknown_chunks on a read pointer it must get the location right.
+ */
+ if (location == 0)
+ png_error(png_ptr, "invalid location in png_set_unknown_chunks");
+
+ /* Now reduce the location to the top-most set bit by removing each least
+ * significant bit in turn.
+ */
+ while (location != (location & -location))
+ location &= ~(location & -location);
+
+ /* The cast is safe because 'location' is a bit mask and only the low four
+ * bits are significant.
+ */
+ return (png_byte)location;
+}
+
void PNGAPI
-png_set_unknown_chunks(png_structp png_ptr,
- png_infop info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
+png_set_unknown_chunks(png_const_structrp png_ptr,
+ png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
{
png_unknown_chunkp np;
- int i;
- if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
+ if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 ||
+ unknowns == NULL)
return;
- np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
- (png_size_t)(info_ptr->unknown_chunks_num + num_unknowns) *
- png_sizeof(png_unknown_chunk));
+ /* Check for the failure cases where support has been disabled at compile
+ * time. This code is hardly ever compiled - it's here because
+ * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this
+ * code) but may be meaningless if the read or write handling of unknown
+ * chunks is not compiled in.
+ */
+# if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \
+ defined(PNG_READ_SUPPORTED)
+ if (png_ptr->mode & PNG_IS_READ_STRUCT)
+ {
+ png_app_error(png_ptr, "no unknown chunk support on read");
+ return;
+ }
+# endif
+# if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \
+ defined(PNG_WRITE_SUPPORTED)
+ if (!(png_ptr->mode & PNG_IS_READ_STRUCT))
+ {
+ png_app_error(png_ptr, "no unknown chunk support on write");
+ return;
+ }
+# endif
+
+ /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that
+ * unknown critical chunks could be lost with just a warning resulting in
+ * undefined behavior. Now png_chunk_report is used to provide behavior
+ * appropriate to read or write.
+ */
+ np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr,
+ info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns,
+ sizeof *np));
if (np == NULL)
{
- png_warning(png_ptr,
- "Out of memory while processing unknown chunk");
+ png_chunk_report(png_ptr, "too many unknown chunks",
+ PNG_CHUNK_WRITE_ERROR);
return;
}
- png_memcpy(np, info_ptr->unknown_chunks,
- (png_size_t)info_ptr->unknown_chunks_num *
- png_sizeof(png_unknown_chunk));
-
png_free(png_ptr, info_ptr->unknown_chunks);
- info_ptr->unknown_chunks = NULL;
-
- for (i = 0; i < num_unknowns; i++)
- {
- png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
- png_const_unknown_chunkp from = unknowns + i;
+ info_ptr->unknown_chunks = np; /* safe because it is initialized */
+ info_ptr->free_me |= PNG_FREE_UNKN;
- png_memcpy(to->name, from->name, png_sizeof(from->name));
- to->name[png_sizeof(to->name)-1] = '\0';
- to->size = from->size;
+ np += info_ptr->unknown_chunks_num;
- /* Note our location in the read or write sequence */
- to->location = (png_byte)(png_ptr->mode & 0xff);
+ /* Increment unknown_chunks_num each time round the loop to protect the
+ * just-allocated chunk data.
+ */
+ for (; num_unknowns > 0; --num_unknowns, ++unknowns)
+ {
+ memcpy(np->name, unknowns->name, (sizeof np->name));
+ np->name[(sizeof np->name)-1] = '\0';
+ np->location = check_location(png_ptr, unknowns->location);
- if (from->size == 0)
- to->data=NULL;
+ if (unknowns->size == 0)
+ {
+ np->data = NULL;
+ np->size = 0;
+ }
else
{
- to->data = (png_bytep)png_malloc_warn(png_ptr,
- (png_size_t)from->size);
+ np->data = png_voidcast(png_bytep,
+ png_malloc_base(png_ptr, unknowns->size));
- if (to->data == NULL)
+ if (np->data == NULL)
{
- png_warning(png_ptr,
- "Out of memory while processing unknown chunk");
- to->size = 0;
+ png_chunk_report(png_ptr, "unknown chunk: out of memory",
+ PNG_CHUNK_WRITE_ERROR);
+ /* But just skip storing the unknown chunk */
+ continue;
}
- else
- png_memcpy(to->data, from->data, from->size);
+ memcpy(np->data, unknowns->data, unknowns->size);
+ np->size = unknowns->size;
}
- }
- info_ptr->unknown_chunks = np;
- info_ptr->unknown_chunks_num += num_unknowns;
- info_ptr->free_me |= PNG_FREE_UNKN;
+ /* These increments are skipped on out-of-memory for the data - the
+ * unknown chunk entry gets overwritten if the png_chunk_report returns.
+ * This is correct in the read case (the chunk is just dropped.)
+ */
+ ++np;
+ ++(info_ptr->unknown_chunks_num);
+ }
}
void PNGAPI
-png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
+png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
int chunk, int location)
{
- if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
- info_ptr->unknown_chunks_num)
- info_ptr->unknown_chunks[chunk].location = (png_byte)location;
+ /* This API is pretty pointless in 1.6.0 because the location can be set
+ * before the call to png_set_unknown_chunks.
+ *
+ * TODO: add a png_app_warning in 1.7
+ */
+ if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&
+ chunk < info_ptr->unknown_chunks_num)
+ {
+ if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)
+ {
+ png_app_error(png_ptr, "invalid unknown chunk location");
+ /* Fake out the pre 1.6.0 behavior: */
+ if ((location & PNG_HAVE_IDAT)) /* undocumented! */
+ location = PNG_AFTER_IDAT;
+
+ else
+ location = PNG_HAVE_IHDR; /* also undocumented */
+ }
+
+ info_ptr->unknown_chunks[chunk].location =
+ check_location(png_ptr, location);
+ }
}
#endif
#ifdef PNG_MNG_FEATURES_SUPPORTED
png_uint_32 PNGAPI
-png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
+png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features)
{
png_debug(1, "in png_permit_mng_features");
if (png_ptr == NULL)
- return (png_uint_32)0;
+ return 0;
- png_ptr->mng_features_permitted =
- (png_byte)(mng_features & PNG_ALL_MNG_FEATURES);
+ png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES;
- return (png_uint_32)png_ptr->mng_features_permitted;
+ return png_ptr->mng_features_permitted;
}
#endif
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+static unsigned int
+add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep)
+{
+ unsigned int i;
+
+ /* Utility function: update the 'keep' state of a chunk if it is already in
+ * the list, otherwise add it to the list.
+ */
+ for (i=0; i<count; ++i, list += 5) if (memcmp(list, add, 4) == 0)
+ {
+ list[4] = (png_byte)keep;
+ return count;
+ }
+
+ if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
+ {
+ ++count;
+ memcpy(list, add, 4);
+ list[4] = (png_byte)keep;
+ }
+
+ return count;
+}
+
void PNGAPI
-png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_const_bytep
- chunk_list, int num_chunks)
+png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
+ png_const_bytep chunk_list, int num_chunks_in)
{
- png_bytep new_list, p;
- int i, old_num_chunks;
+ png_bytep new_list;
+ unsigned int num_chunks, old_num_chunks;
+
if (png_ptr == NULL)
return;
- if (num_chunks == 0)
+ if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)
{
- if (keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE)
- png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
+ png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");
+ return;
+ }
- else
- png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
+ if (num_chunks_in <= 0)
+ {
+ png_ptr->unknown_default = keep;
- if (keep == PNG_HANDLE_CHUNK_ALWAYS)
- png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
+ /* '0' means just set the flags, so stop here */
+ if (num_chunks_in == 0)
+ return;
+ }
- else
- png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
+ if (num_chunks_in < 0)
+ {
+ /* Ignore all unknown chunks and all chunks recognized by
+ * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
+ */
+ static PNG_CONST png_byte chunks_to_ignore[] = {
+ 98, 75, 71, 68, '\0', /* bKGD */
+ 99, 72, 82, 77, '\0', /* cHRM */
+ 103, 65, 77, 65, '\0', /* gAMA */
+ 104, 73, 83, 84, '\0', /* hIST */
+ 105, 67, 67, 80, '\0', /* iCCP */
+ 105, 84, 88, 116, '\0', /* iTXt */
+ 111, 70, 70, 115, '\0', /* oFFs */
+ 112, 67, 65, 76, '\0', /* pCAL */
+ 112, 72, 89, 115, '\0', /* pHYs */
+ 115, 66, 73, 84, '\0', /* sBIT */
+ 115, 67, 65, 76, '\0', /* sCAL */
+ 115, 80, 76, 84, '\0', /* sPLT */
+ 115, 84, 69, 82, '\0', /* sTER */
+ 115, 82, 71, 66, '\0', /* sRGB */
+ 116, 69, 88, 116, '\0', /* tEXt */
+ 116, 73, 77, 69, '\0', /* tIME */
+ 122, 84, 88, 116, '\0' /* zTXt */
+ };
+
+ chunk_list = chunks_to_ignore;
+ num_chunks = (sizeof chunks_to_ignore)/5;
+ }
- return;
+ else /* num_chunks_in > 0 */
+ {
+ if (chunk_list == NULL)
+ {
+ /* Prior to 1.6.0 this was silently ignored, now it is an app_error
+ * which can be switched off.
+ */
+ png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");
+ return;
+ }
+
+ num_chunks = num_chunks_in;
}
- if (chunk_list == NULL)
+ old_num_chunks = png_ptr->num_chunk_list;
+ if (png_ptr->chunk_list == NULL)
+ old_num_chunks = 0;
+
+ /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow.
+ */
+ if (num_chunks + old_num_chunks > UINT_MAX/5)
+ {
+ png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");
return;
+ }
- old_num_chunks = png_ptr->num_chunk_list;
- new_list=(png_bytep)png_malloc(png_ptr,
- (png_size_t)(5*(num_chunks + old_num_chunks)));
+ /* If these chunks are being reset to the default then no more memory is
+ * required because add_one_chunk above doesn't extend the list if the 'keep'
+ * parameter is the default.
+ */
+ if (keep)
+ {
+ new_list = png_voidcast(png_bytep, png_malloc(png_ptr,
+ 5 * (num_chunks + old_num_chunks)));
+
+ if (old_num_chunks > 0)
+ memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
+ }
+
+ else if (old_num_chunks > 0)
+ new_list = png_ptr->chunk_list;
- if (png_ptr->chunk_list != NULL)
+ else
+ new_list = NULL;
+
+ /* Add the new chunks together with each one's handling code. If the chunk
+ * already exists the code is updated, otherwise the chunk is added to the
+ * end. (In libpng 1.6.0 order no longer matters because this code enforces
+ * the earlier convention that the last setting is the one that is used.)
+ */
+ if (new_list != NULL)
{
- png_memcpy(new_list, png_ptr->chunk_list,
- (png_size_t)(5*old_num_chunks));
- png_free(png_ptr, png_ptr->chunk_list);
- png_ptr->chunk_list=NULL;
+ png_const_bytep inlist;
+ png_bytep outlist;
+ unsigned int i;
+
+ for (i=0; i<num_chunks; ++i)
+ old_num_chunks = add_one_chunk(new_list, old_num_chunks,
+ chunk_list+5*i, keep);
+
+ /* Now remove any spurious 'default' entries. */
+ num_chunks = 0;
+ for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5)
+ if (inlist[4])
+ {
+ if (outlist != inlist)
+ memcpy(outlist, inlist, 5);
+ outlist += 5;
+ ++num_chunks;
+ }
+
+ /* This means the application has removed all the specialized handling. */
+ if (num_chunks == 0)
+ {
+ if (png_ptr->chunk_list != new_list)
+ png_free(png_ptr, new_list);
+
+ new_list = NULL;
+ }
}
- png_memcpy(new_list + 5*old_num_chunks, chunk_list,
- (png_size_t)(5*num_chunks));
+ else
+ num_chunks = 0;
- for (p = new_list + 5*old_num_chunks + 4, i = 0; i<num_chunks; i++, p += 5)
- *p=(png_byte)keep;
+ png_ptr->num_chunk_list = num_chunks;
- png_ptr->num_chunk_list = old_num_chunks + num_chunks;
- png_ptr->chunk_list = new_list;
- png_ptr->free_me |= PNG_FREE_LIST;
+ if (png_ptr->chunk_list != new_list)
+ {
+ if (png_ptr->chunk_list != NULL)
+ png_free(png_ptr, png_ptr->chunk_list);
+
+ png_ptr->chunk_list = new_list;
+ }
}
#endif
#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
void PNGAPI
-png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
+png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr,
png_user_chunk_ptr read_user_chunk_fn)
{
png_debug(1, "in png_set_read_user_chunk_fn");
#ifdef PNG_INFO_IMAGE_SUPPORTED
void PNGAPI
-png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
+png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr,
+ png_bytepp row_pointers)
{
png_debug1(1, "in %s storage function", "rows");
#endif
void PNGAPI
-png_set_compression_buffer_size(png_structp png_ptr, png_size_t size)
+png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size)
{
if (png_ptr == NULL)
return;
- png_free(png_ptr, png_ptr->zbuf);
+ if (size == 0 || size > PNG_UINT_31_MAX)
+ png_error(png_ptr, "invalid compression buffer size");
- if (size > ZLIB_IO_MAX)
- {
- png_warning(png_ptr, "Attempt to set buffer size beyond max ignored");
- png_ptr->zbuf_size = ZLIB_IO_MAX;
- size = ZLIB_IO_MAX; /* must fit */
- }
+# ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+ if (png_ptr->mode & PNG_IS_READ_STRUCT)
+ {
+ png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */
+ return;
+ }
+# endif
- else
- png_ptr->zbuf_size = (uInt)size;
+# ifdef PNG_WRITE_SUPPORTED
+ if (!(png_ptr->mode & PNG_IS_READ_STRUCT))
+ {
+ if (png_ptr->zowner != 0)
+ {
+ png_warning(png_ptr,
+ "Compression buffer size cannot be changed because it is in use");
+ return;
+ }
- png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
+ if (size > ZLIB_IO_MAX)
+ {
+ png_warning(png_ptr,
+ "Compression buffer size limited to system maximum");
+ size = ZLIB_IO_MAX; /* must fit */
+ }
- /* The following ensures a relatively safe failure if this gets called while
- * the buffer is actually in use.
- */
- png_ptr->zstream.next_out = png_ptr->zbuf;
- png_ptr->zstream.avail_out = 0;
- png_ptr->zstream.avail_in = 0;
+ else if (size < 6)
+ {
+ /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH
+ * if this is permitted.
+ */
+ png_warning(png_ptr,
+ "Compression buffer size cannot be reduced below 6");
+ return;
+ }
+
+ if (png_ptr->zbuffer_size != size)
+ {
+ png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
+ png_ptr->zbuffer_size = (uInt)size;
+ }
+ }
+# endif
}
void PNGAPI
-png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
+png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)
{
if (png_ptr && info_ptr)
info_ptr->valid &= ~mask;
}
-
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
/* This function was added to libpng 1.2.6 */
void PNGAPI
-png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max,
+png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max,
png_uint_32 user_height_max)
{
/* Images with dimensions larger than these limits will be
/* This function was added to libpng 1.4.0 */
void PNGAPI
-png_set_chunk_cache_max (png_structp png_ptr,
- png_uint_32 user_chunk_cache_max)
+png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max)
{
if (png_ptr)
png_ptr->user_chunk_cache_max = user_chunk_cache_max;
/* This function was added to libpng 1.4.1 */
void PNGAPI
-png_set_chunk_malloc_max (png_structp png_ptr,
+png_set_chunk_malloc_max (png_structrp png_ptr,
png_alloc_size_t user_chunk_malloc_max)
{
if (png_ptr)
#ifdef PNG_BENIGN_ERRORS_SUPPORTED
void PNGAPI
-png_set_benign_errors(png_structp png_ptr, int allowed)
+png_set_benign_errors(png_structrp png_ptr, int allowed)
{
png_debug(1, "in png_set_benign_errors");
+ /* If allowed is 1, png_benign_error() is treated as a warning.
+ *
+ * If allowed is 0, png_benign_error() is treated as an error (which
+ * is the default behavior if png_set_benign_errors() is not called).
+ */
+
if (allowed)
- png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN;
+ png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN |
+ PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN;
else
- png_ptr->flags &= ~PNG_FLAG_BENIGN_ERRORS_WARN;
+ png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN |
+ PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN);
}
#endif /* PNG_BENIGN_ERRORS_SUPPORTED */
+
+#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
+ /* Whether to report invalid palette index; added at libng-1.5.10.
+ * It is possible for an indexed (color-type==3) PNG file to contain
+ * pixels with invalid (out-of-range) indexes if the PLTE chunk has
+ * fewer entries than the image's bit-depth would allow. We recover
+ * from this gracefully by filling any incomplete palette with zeroes
+ * (opaque black). By default, when this occurs libpng will issue
+ * a benign error. This API can be used to override that behavior.
+ */
+void PNGAPI
+png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)
+{
+ png_debug(1, "in png_set_check_for_invalid_index");
+
+ if (allowed > 0)
+ png_ptr->num_palette_max = 0;
+
+ else
+ png_ptr->num_palette_max = -1;
+}
+#endif
#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
projects / wxWidgets.git / blobdiff