check that the version of __sync_sub_and_fetch that returns a value is supported...

[wxWidgets.git] / src / png / Y2KINFO

diff --git a/src/png/Y2KINFO b/src/png/Y2KINFO
index bf41676ffb76e0d3da6be3f291cefe7afb270315..67ee7ba94526210a37927cece2676a4888746a6e 100644 (file)
--- a/src/png/Y2KINFO
+++ b/src/png/Y2KINFO
@@ -1,29 +1,29 @@
    Y2K compliance in libpng:
    =========================
    Y2K compliance in libpng:
    =========================

-      
-      January 13, 1999
-      
+
+      September 8, 2007
+

       Since the PNG Development group is an ad-hoc body, we can't make
       an official declaration.
       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 0.81 and
-      upward are Y2K compliant.  It is my belief that earlier versions were
-      also Y2K compliant.
-      
+
+      This is your unofficial assurance that libpng from version 0.71 and
+      upward through 1.2.20 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.
       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 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.
       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:
 
       There are seven time-related functions:
 

-          png_convert_to_rfc_1123() in png.c 
+          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
             (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


@@ -31,22 +31,25 @@
           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
           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 
+
+      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()
       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 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.
-      
+      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.
       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
          Glenn Randers-Pehrson
          libpng maintainer
          PNG Development Group