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[libpng17] Support builds with unsupported PNG_TRANSFORM_* values. All of the

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PNG_TRANSFORM_* values are always defined in png.h and, because they
are used for both read and write in some cases, it is not reliable
to #if out ones that are totally unsupported. This change adds error
detection in png_read_image() and png_write_image() to do a
png_app_error() if the app requests something that cannot be done
and it adds corresponding code to pngimage.c to handle such options
by not attempting to test them.
This commit is contained in:
John Bowler
2014-02-05 20:13:19 -06:00
committed by Glenn Randers-Pehrson
parent 3d7f3bbab7
commit fb1305faeb
5 changed files with 138 additions and 60 deletions
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12
ANNOUNCE
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@@ -1,5 +1,5 @@
Libpng 1.7.0beta31 - February 5, 2014
Libpng 1.7.0beta31 - February 6, 2014
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.
@@ -504,7 +504,7 @@ Version 1.7.0beta30 [February 2, 2014]
the program by virtue of exhaustively testing all the transforms is
very slow.
Version 1.7.0beta31 [February 5, 2014]
Version 1.7.0beta31 [February 6, 2014]
Make png_read_png() and png_write_png() prototypes in png.h depend
upon PNG_READ_SUPPORTED and PNG_WRITE_SUPPORTED.
Removed dependence on !PNG_READ_EXPAND_SUPPORTED for calling
@@ -524,6 +524,14 @@ Version 1.7.0beta31 [February 5, 2014]
PAETH filtering code from libpng-1.7.0beta24/pngrutil.c. Deleted
the other instance of "c = b;" which is the one that triggered a
scan-build warning.
Support builds with unsupported PNG_TRANSFORM_* values. All of the
PNG_TRANSFORM_* values are always defined in png.h and, because they
are used for both read and write in some cases, it is not reliable
to #if out ones that are totally unsupported. This change adds error
detection in png_read_image() and png_write_image() to do a
png_app_error() if the app requests something that cannot be done
and it adds corresponding code to pngimage.c to handle such options
by not attempting to test them.
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