Description:
------------
ext/standard/base64.c contains a mapping array called base64_reverse_table that has 256 elements, but only 240 initializers. This means that input characters in the range 0xF0 to 0xFF map to 0 (because the compiler fills the remaining elements) instead of -1 and therefore are not ignored as they should be.

Here's a diff for the trivial patch:

*** base64.c.orig       Tue Jun 24 11:01:32 2003
--- base64.c    Tue Jun 24 11:02:26 2003
***************
*** 48,53 ****
--- 48,54 ----
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+       -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
  };
  /* }}} */