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[libpng17] Updated comments and manual with elimination of PNG_SAFE_LIMITS

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Glenn Randers-Pehrson
2014-12-23 22:43:57 -06:00
parent eeab1cfefc
commit d92b0f23e6
4 changed files with 40 additions and 27 deletions
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19
libpng-manual.txt
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@@ -1,6 +1,6 @@
libpng-manual.txt - A description on how to use and modify libpng
libpng version 1.7.0beta45 - December 23, 2014
libpng version 1.7.0beta45 - December 24, 2014
Updated and distributed by Glenn Randers-Pehrson
<glennrp at users.sourceforge.net>
Copyright (c) 1998-2014 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@ libpng-manual.txt - A description on how to use and modify libpng
Based on:
libpng versions 0.97, January 1998, through 1.7.0beta45 - December 23, 2014
libpng versions 0.97, January 1998, through 1.7.0beta45 - December 24, 2014
Updated and distributed by Glenn Randers-Pehrson
Copyright (c) 1998-2014 Glenn Randers-Pehrson
@@ -648,7 +648,7 @@ User limits
The PNG specification allows the width and height of an image to be as
large as 2^31-1 (0x7fffffff), or about 2.147 billion rows and columns.
Since very few applications really need to process such large images,
we have imposed an arbitrary 1-million limit on rows and columns.
we have imposed an arbitrary 640000 limit on rows and columns.
Larger images will be rejected immediately with a png_error() call. If
you wish to change this limit, you can use
@@ -5106,6 +5106,17 @@ length, which resulted in PNG files that cannot be read beyond the bad iTXt
chunk. This error was fixed in libpng-1.6.3, and a tool (called
contrib/tools/png-fix-itxt) has been added to the libpng distribution.
Starting with libpng-1.6.17, the PNG_SAFE_LIMITS macro was eliminated
and safe limits are used by default (users who need larger limits
can still override them at compile time or run time, as described above).
The new limits are
default
png_user_width_max 640,000
png_user_height_max 640,000
png_user_chunk_cache_max 128
png_user_chunk_malloc_max 8,000,000
XIII. Changes to Libpng from version 1.6.x to 1.7.x
Some functions that were deprecated in libpng-1.6.0 were removed:
@@ -5309,7 +5320,7 @@ Other rules can be inferred by inspecting the libpng source.
XVII. Y2K Compliance in libpng
December 23, 2014
December 24, 2014
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.