| Libpng 1.6.24beta02 - June 20, 2016 |
| |
| 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. |
| |
| Files available for download: |
| |
| Source files with LF line endings (for Unix/Linux) and with a |
| "configure" script |
| |
| 1.6.24beta02.tar.xz (LZMA-compressed, recommended) |
| 1.6.24beta02.tar.gz |
| |
| Source files with CRLF line endings (for Windows), without the |
| "configure" script |
| |
| lp1624b02.7z (LZMA-compressed, recommended) |
| lp1624b02.zip |
| |
| Other information: |
| |
| 1.6.24beta02-README.txt |
| 1.6.24beta02-LICENSE.txt |
| libpng-1.6.24beta02-*.asc (armored detached GPG signatures) |
| |
| Changes since the last public release (1.6.23): |
| |
| Version 1.6.24beta01 [June 11, 2016] |
| Avoid potential overflow of the PNG_IMAGE_SIZE macro. This macro |
| is not used within libpng, but is used in some of the examples. |
| |
| Version 1.6.24beta02 [June 20, 2016] |
| Correct filter heuristic overflow handling. This was broken when the |
| write filter code was moved out-of-line; if there is a single filter and |
| the heuristic sum overflows the calculation of the filtered line is not |
| completed. In versions prior to 1.6 the code was duplicated in-line |
| and the check not performed, so the filter operation completed; however, |
| in the multi-filter case where the sum is performed the 'none' filter would |
| be selected if all the sums overflowed, even if it wasn't in the filter |
| list. The fix to the first problem is simply to provide PNG_SIZE_MAX as |
| the current lmins sum value; this means the sum can never exceed it and |
| overflows silently. A reasonable compiler that does choose to inline |
| the code will simply eliminate the sum check. |
| The fix to the second problem is to use high precision arithmetic (this is |
| implemented in 1.7), however a simple safe fix here is to chose the lowest |
| numbered filter in the list from png_set_filter (this only works if the |
| first problem is also fixed) (John Bowler). |
| Use a more efficient absolute value calculation on SSE2 (Matthieu Darbois). |
| |
| Send comments/corrections/commendations to png-mng-implement at lists.sf.net |
| (subscription required; visit |
| https://lists.sourceforge.net/lists/listinfo/png-mng-implement |
| to subscribe) |
| or to glennrp at users.sourceforge.net |
| |
| Glenn R-P |
