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[libpng16] Don't check palette indexes if num_palette is 0 (as it can be in

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MNG files).
This commit is contained in:
Glenn Randers-Pehrson 2012-06-07 10:18:25 -05:00
parent 8f424b8270
commit 905cc94e3d
3 changed files with 7 additions and 4 deletions
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5
ANNOUNCE
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@ -1,5 +1,5 @@
Libpng 1.6.0beta24 - June 6, 2012
Libpng 1.6.0beta24 - June 7, 2012
This is not intended to be a public release. It will be replaced
within a few weeks by a public version or by another test version.
@ -380,7 +380,8 @@ Version 1.6.0beta23 [June 6, 2012]
update the value when it actually increases, move test for whether
the check is wanted out of the function.
Version 1.6.0beta24 [June 6, 2012]
Version 1.6.0beta24 [June 7, 2012]
Don't check palette indexes if num_palette is 0 (as it can be in MNG files).
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

3
CHANGES
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@ -4131,7 +4131,8 @@ Version 1.6.0beta23 [June 6, 2012]
update the value when it actually increases, move test for whether
the check is wanted out of the function.
Version 1.6.0beta24 [June 6, 2012]
Version 1.6.0beta24 [June 7, 2012]
Don't check palette indexes if num_palette is 0 (as it can be in MNG files).
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

3
pngtrans.c
View File

@ -625,7 +625,8 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
void /* PRIVATE */
png_do_check_palette_indexes(png_structrp png_ptr, png_row_infop row_info)
{
if (png_ptr->num_palette < (1 << row_info->bit_depth))
if (png_ptr->num_palette < (1 << row_info->bit_depth) &&
png_ptr->num_palette > 0) /* num_palette can be 0 in MNG files */
{
/* Calculations moved outside switch in an attempt to stop different
* compiler warnings. 'padding' is in *bits* within the last byte, it is