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author | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 18:28:30 -0800 |
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committer | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 18:28:30 -0800 |
commit | 0d889b4fd2c96153983a28cc5757c0172d9eb78b (patch) | |
tree | 4b825dc642cb6eb9a060e54bf8d69288fbee4904 /Y2KINFO | |
parent | 78ac9384d6ca0067d77b843b70bbdd828bb738df (diff) | |
download | external_libpng-0d889b4fd2c96153983a28cc5757c0172d9eb78b.zip external_libpng-0d889b4fd2c96153983a28cc5757c0172d9eb78b.tar.gz external_libpng-0d889b4fd2c96153983a28cc5757c0172d9eb78b.tar.bz2 |
auto import from //depot/cupcake/@135843
Diffstat (limited to 'Y2KINFO')
-rw-r--r-- | Y2KINFO | 55 |
1 files changed, 0 insertions, 55 deletions
diff --git a/Y2KINFO b/Y2KINFO deleted file mode 100644 index 43348df..0000000 --- a/Y2KINFO +++ /dev/null @@ -1,55 +0,0 @@ - Y2K compliance in libpng: - ========================= - - May 8, 2008 - - Since the PNG Development group is an ad-hoc body, we can't make - an official declaration. - - This is your unofficial assurance that libpng from version 0.71 and - upward through 1.2.29 are Y2K compliant. It is my belief that earlier - versions were also Y2K compliant. - - Libpng only has three year fields. One is a 2-byte unsigned integer - that will hold years up to 65535. The other two hold the date in text - format, and will hold years up to 9999. - - The integer is - "png_uint_16 year" in png_time_struct. - - The strings are - "png_charp time_buffer" in png_struct and - "near_time_buffer", which is a local character string in png.c. - - There are seven time-related functions: - - png_convert_to_rfc_1123() in png.c - (formerly png_convert_to_rfc_1152() in error) - png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c - png_convert_from_time_t() in pngwrite.c - png_get_tIME() in pngget.c - png_handle_tIME() in pngrutil.c, called in pngread.c - png_set_tIME() in pngset.c - png_write_tIME() in pngwutil.c, called in pngwrite.c - - All appear to handle dates properly in a Y2K environment. The - png_convert_from_time_t() function calls gmtime() to convert from system - clock time, which returns (year - 1900), which we properly convert to - the full 4-digit year. There is a possibility that applications using - libpng are not passing 4-digit years into the png_convert_to_rfc_1123() - function, or that they are incorrectly passing only a 2-digit year - instead of "year - 1900" into the png_convert_from_struct_tm() function, - but this is not under our control. The libpng documentation has always - stated that it works with 4-digit years, and the APIs have been - documented as such. - - The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned - integer to hold the year, and can hold years as large as 65535. - - zlib, upon which libpng depends, is also Y2K compliant. It contains - no date-related code. - - - Glenn Randers-Pehrson - libpng maintainer - PNG Development Group |