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[libpng16] Renamed contrib/tools/fixitxt to contrib/tools/png-fix-itxt.

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Added information in the documentation about problems with and fixes for
the bad CRC and bad iTXt chunk situations.
This commit is contained in:
Glenn Randers-Pehrson
2013-05-08 19:46:10 -05:00
parent 122bec17f2
commit ff141eb21e
7 changed files with 63 additions and 23 deletions
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28
libpng.3
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@@ -1,4 +1,4 @@
.TH LIBPNG 3 "May 6, 2013"
.TH LIBPNG 3 "May 9, 2013"
.SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library 1.6.3beta05
.SH SYNOPSIS
@@ -504,7 +504,7 @@ Following is a copy of the libpng-manual.txt file that accompanies libpng.
.SH LIBPNG.TXT
libpng-manual.txt - A description on how to use and modify libpng
libpng version 1.6.3beta05 - May 6, 2013
libpng version 1.6.3beta05 - May 9, 2013
Updated and distributed by Glenn Randers-Pehrson
<glennrp at users.sourceforge.net>
Copyright (c) 1998-2013 Glenn Randers-Pehrson
@@ -515,7 +515,7 @@ libpng-manual.txt - A description on how to use and modify libpng
Based on:
libpng versions 0.97, January 1998, through 1.6.3beta05 - May 6, 2013
libpng versions 0.97, January 1998, through 1.6.3beta05 - May 9, 2013
Updated and distributed by Glenn Randers-Pehrson
Copyright (c) 1998-2013 Glenn Randers-Pehrson
@@ -5540,6 +5540,20 @@ The machine-generated configure files are no longer included in branches
libpng16 and later of the GIT repository. They continue to be included
in the tarball releases, however.
Libpng-1.6.0 and later use the CMF bytes at the beginning of the IDAT stream
to set the size of the sliding window for reading instead of using the default
32-kbyte sliding window size. It was discovered that there are hundreds of PNG
files in the wild that have incorrect CMF bytes that cause libpng to now issue
a "too far back" error and reject the file. Libpng-1.6.3 provides a way to
revert to the libpng-1.5.x behavior (ignoring the CMF bytes and using a 32-kbyte
sliding window), and provides a tool (called "contrib/tools/pnginflate"),
for optimizing the CMF bytes correctly.
Libpng-1.6.0 and libpng-1.6.1 wrote uncompressed iTXt chunks with the wrong
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.
.SH XIII. Detecting libpng
The png_get_io_ptr() function has been present since libpng-0.88, has never
@@ -5702,7 +5716,7 @@ Other rules can be inferred by inspecting the libpng source.
.SH XVI. Y2K Compliance in libpng
May 6, 2013
May 9, 2013
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
@@ -5979,7 +5993,7 @@ possible without all of you.
Thanks to Frank J. T. Wojcik for helping with the documentation.
Libpng version 1.6.3beta05 - May 6, 2013:
Libpng version 1.6.3beta05 - May 9, 2013:
Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
@@ -6002,7 +6016,7 @@ this sentence.
This code is released under the libpng license.
libpng versions 1.2.6, August 15, 2004, through 1.6.3beta05, May 6, 2013, are
libpng versions 1.2.6, August 15, 2004, through 1.6.3beta05, May 9, 2013, are
Copyright (c) 2004,2006-2007 Glenn Randers-Pehrson, and are
distributed according to the same disclaimer and license as libpng-1.2.5
with the following individual added to the list of Contributing Authors
@@ -6101,7 +6115,7 @@ certification mark of the Open Source Initiative.
Glenn Randers-Pehrson
glennrp at users.sourceforge.net
May 6, 2013
May 9, 2013
.\" end of man page