Converter update for Big5, KOI8-U and timezone update to 2015g

scripts/big5_gen.sh

 #!/bin/sh
 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # References:
 #   https://encoding.spec.whatwg.org/#big5
 
 # This script downloads the following file.
 #   https://encoding.spec.whatwg.org/index-big5.txt
@@ skipping 41 matching lines @@
 
 function ascii {
   for i in $(seq 0 127)
   do
     printf '<U%04X> \\x%02X |0\n' $i $i
   done
 }
 
 
 # HKSCS characters are not supported in encoding ( |lead < 0xA1| )
-# Entries with pointer=528[79] have to be decoding-only even though
-# come before the other entry with the same Unicode character.
+# Entries with pointer=528[79] and 5247 ~ 5250 have to be decoding-only
+# even though they come before the other entry with the same Unicode
+# character. The corresponding Unicode characters are U+255[0E],
+# U+256[1A], and U+534[15].
 # See https://www.w3.org/Bugs/Public/show_bug.cgi?id=27878
 function big5 {
   awk '!/^#/ && !/^$/ \
        { pointer = $1; \
          ucs = substr($2, 3); \
          sortkey = (length(ucs) < 5) ? ("0" ucs) : ucs;
          lead = pointer / 157 + 0x81; \
          is_decoding_only = lead < 0xA1 || seen_before[ucs] || \
-             pointer == 5287 || pointer == 5289; \
+             pointer == 5287 || pointer == 5289 || \
+             (5247 <= pointer && pointer <= 5250);
          trail = $1 % 157; \
          trail_offset = trail < 0x3F ? 0x40 : 0x62; \
          tag = (is_decoding_only ? 3 : 0); \
          printf ("<U%4s> \\x%02X\\x%02X |%d %s\n", ucs,\
                  lead,  trail + trail_offset, tag, sortkey);\
          seen_before[ucs] = is_decoding_only ? 0 : 1; \
        }' \
   index-big5.txt
 }
 
 function two_char_seq {
 cat <<EOF
 <U00CA><U0304> \x88\x62 |3 000CA
 <U00CA><U030C> \x88\x64 |3 000CA
 <U00EA><U0304> \x88\xA3 |3 000EA
 <U00EA><U030C> \x88\xA5 |3 000EA
 EOF
 }
 
 function unsorted_table {
   two_char_seq
   big5
 }
 
 wget -N -r -nd https://encoding.spec.whatwg.org/index-big5.txt
 preamble
 ascii
 unsorted_table | sort -k4  | uniq | cut -f 1-3 -d ' '
 echo 'END CHARMAP'