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[libpng15] Safely convert num_bytes to a png_byte in png_set_sig_bytes() (Robert

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Seacord).
This commit is contained in:
Glenn Randers-Pehrson
2015-08-18 10:23:35 -05:00
parent 357f3da6b0
commit a88dec67f2
6 changed files with 36 additions and 23 deletions
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12
example.c
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@@ -89,7 +89,7 @@ void read_png(char *file_name) /* We need to open the file */
{
png_structp png_ptr;
png_infop info_ptr;
unsigned int sig_read = 0;
int sig_read = 0;
png_uint_32 width, height;
int bit_depth, color_type, interlace_type;
FILE *fp;
@@ -98,7 +98,7 @@ void read_png(char *file_name) /* We need to open the file */
return (ERROR);
#else no_open_file /* prototype 2 */
void read_png(FILE *fp, unsigned int sig_read) /* File is already open */
void read_png(FILE *fp, int sig_read) /* File is already open */
{
png_structp png_ptr;
png_infop info_ptr;
@@ -188,7 +188,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* File is already open */
* are mutually exclusive.
*/
/* Tell libpng to strip 16 bit/color files down to 8 bits/color.
/* Tell libpng to strip 16 bits/color files down to 8 bits/color.
* Use accurate scaling if it's available, otherwise just chop off the
* low byte.
*/
@@ -284,7 +284,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* File is already open */
}
#ifdef PNG_READ_QUANTIZE_SUPPORTED
/* Quantize RGB files down to 8 bit palette or reduce palettes
/* Quantize RGB files down to 8-bit palette or reduce palettes
* to the number of colors available on your screen.
*/
if (color_type & PNG_COLOR_MASK_COLOR)
@@ -336,7 +336,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* File is already open */
/* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */
png_set_swap_alpha(png_ptr);
/* Swap bytes of 16 bit files to least significant byte first */
/* Swap bytes of 16-bit files to least significant byte first */
png_set_swap(png_ptr);
/* Add filler (or alpha) byte (before/after each RGB triplet) */
@@ -784,7 +784,7 @@ void write_png(char *file_name /* , ... other image information ... */)
/* Swap bytes of 16-bit files to most significant byte first */
png_set_swap(png_ptr);
/* Swap bits of 1, 2, 4 bit packed pixel formats */
/* Swap bits of 1-bit, 2-bit, 4-bit packed pixel formats */
png_set_packswap(png_ptr);
/* Turn on interlace handling if you are not using png_write_image() */