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[devel] Mention the reason to call png_read_end() in the libpng documentation.

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Glenn Randers-Pehrson
2011-04-20 17:43:52 -05:00
parent cf78aee1c4
commit 99778e17af
2 changed files with 24 additions and 12 deletions
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14
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 1.5.3beta04 - April 17, 2011
libpng version 1.5.3beta04 - April 20, 2011
Updated and distributed by Glenn Randers-Pehrson
<glennrp at users.sourceforge.net>
Copyright (c) 1998-2011 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 1.5.3beta04 - April 17, 2011
libpng versions 0.97, January 1998, through 1.5.3beta04 - April 20, 2011
Updated and distributed by Glenn Randers-Pehrson
Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -1824,10 +1824,16 @@ low-level interface, you can finish reading the file. If you are
interested in comments or time, which may be stored either before or
after the image data, you should pass the separate png_info struct if
you want to keep the comments from before and after the image
separate. If you are not interested, you can pass NULL.
separate. If you are not interested, you should still call png_read_end()
but you can pass NULL, avoiding the need to create an end_info structure.
png_read_end(png_ptr, end_info);
If you don't call png_read_end(), then your file pointer will be
left pointing to the first chunk after the last IDAT, which is probably
not what you want if you expect to read something beyond the end of
the PNG datastream.
When you are done, you can free all memory allocated by libpng like this:
png_destroy_read_struct(&png_ptr, &info_ptr,
@@ -4174,7 +4180,7 @@ Other rules can be inferred by inspecting the libpng source.
XIV. Y2K Compliance in libpng
April 17, 2011
April 20, 2011
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.