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[libpng16] Work around for duplicate row start calls; added warning messages.

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This turns on PNG_FLAG_DETECT_UNINITIALIZED to detect app code that
fails to call one of the 'start' routines (not enabled in libpng-1.5
because it is technically an API change, since it did normally work
before.)  It also makes duplicate calls to png_read_start_row (an
internal function called at the start of the image read) benign, as
they were before changes to use png_inflate_claim. Somehow webkit is
causing this to happen; this is probably a mis-feature in the zlib
changes so this commit is only a work-round.
This commit is contained in:
John Bowler
2012-03-18 14:39:41 -05:00
committed by Glenn Randers-Pehrson
parent f5dcba6b9b
commit 0c11b5f8e7
5 changed files with 78 additions and 9 deletions
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5
pngread.c
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@@ -50,6 +50,11 @@ png_create_read_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
{
png_ptr->mode = PNG_IS_READ_STRUCT;
/* Turn this on for all transforms in an attempt to detect failure to call
* the image reading start stuff.
*/
png_ptr->flags |= PNG_FLAG_DETECT_UNINITIALIZED;
/* Added in libpng-1.6.0; this can be used to detect a read structure if
* required (it will be zero in a write structure.)
*/