News and History of the PNG Development Group from 2010

Herein lie news items and historical stuff primarily of interest to the Portable Network Graphics Development Group itself. Feel free to poke around even if you're not a member, though. Note that some of the links, particularly the older ones, are broken; in some cases this is explained by later entries. Other links (CompuServe, tcg.arl.mil) have fallen prey to reorganizations or upgrades; should they ever reappear, the entries below will be updated as needed.

Keep in mind that this is history here...

• current - see here

• 10 December 2010 - libpng 1.4.5 is released with more minor fixes and cleanups, the most interesting of which are a new check for out-of-range text compression mode in png_set_text() and the removal of most optional gcc warnings (save those reported by -Wconversion and -Wcast-qual).

• 23 September 2010 - libpng 1.4.4 is released with minor fixes and cleanups, mainly to makefiles and build scripts.

• 25 June 2010 - libpng 1.4.3 is released with a fix for a longstanding excess data-return bug (CVE-2010-1205) involving the progressive-reader API and images with extra IDAT data. (This could cause application crashes, including web browsers and the rpng2 demo app from PNG: The Definitive Guide, and potentially execution of hostile code.) There is also a fix for a memory leak when reading a malformed sCAL chunk, and some other, minor fixes. (libpng 1.2.44 is also released with the same fixes.)

• 6 May 2010 - libpng 1.4.2 is released with minor fixes and cleanups, including restoration of the png_check_sig() macro and png_set_dither() function (the latter renamed to png_set_quantize()) and a new "vstudio" build-project to replace the deprecated "visualc6" and "visualc71" projects. (Note that libpng 1.0.x is now completely unmaintained. 1.2.x will receive only security fixes.)

• 19 April 2010 - zlib 1.2.5 is released with fixes for bugs in gzseek() and gzeof().

• 14 March 2010 - zlib 1.2.4 is released with numerous improvements including new, faster versions of the gzip API; new gzbuffer(), gzoffset(), gzclose_r(), and gzclose_w() functions; faster Z_HUFFMAN_ONLY and Z_RLE modes; large file support (64-bit offsets); and various bugfixes.

• 27 February 2010 - libpng 1.4.1 is released with various fixes, including significantly better performance when decoding highly compressed chunks and a fix for a potential memory leak. (libpng 1.2.43 is also released with the same fixes.)

• 3 January 2010 - libpng 1.4.0 is released at long last! It adds support for the PNG international text (iTXt) chunk, includes a new security-related function to limit total memory allocations, removes a bunch of long-deprecated functions and features, and includes some new cleanups. See the summary for details. (libpng 1.2.42 is also released with some minor fixes.)

Here are some related PNG pages at this site:

• Current News of the PNG Development Group
• Historical PNG news:
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• History of PNG
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