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I18N-ISSUE-448 (BUG27868): EUC-KR and decoding-only mapping [encoding]

From: Internationalization Working Group Issue Tracker <sysbot+tracker@w3.org>
Date: Mon, 30 Mar 2015 14:23:32 +0000
To: public-i18n-core@w3.org
Message-Id: <E1YcabE-00093L-CQ@maia.w3.org>
I18N-ISSUE-448 (BUG27868): EUC-KR and decoding-only mapping [encoding]

http://www.w3.org/International/track/issues/448

Raised by: Richard Ishida
On product: encoding

https://www.w3.org/Bugs/Public/show_bug.cgi?id=27868

This issue tracks the bug listed above and was created as part of the WG CR process.

---

Reporter: jshin@chromium.org

When I compared the mapping of EUC-KR in the encoding spec with ICU's
Windows-949 [1] (that was obtained by scraping *one of Windows' converters*, I
found the following differences:

1. ICU's Windows-949 mapping has 395 'decoding only' (from Unicode to
windows-949) entries for characters like 'Currency Sign cent' (U+00A2, U+00A3),
regular Latin/Greek/Cyrillic letters, and Hangul Conjoining Jamos (U+11xx),
Hangul half-width jamos (U+FFxx), enclosed CJK characters (e.g. U+32xx ) etc. 

2. ICU's Windows-949 has 190 additional round-trip mapping entries. Most of
them  (188 of them) are for the two user-defined blocks in KS X 1001 (in
EUC-KR, "C9 [A1-FE]" and "FE [A1-FE]") that are mapped to PUA code points
(U+E000 - U+E0BB). The remaining two are U+0080 and U+F8F7 mapped to 0x80 and
0xFF. 

I don't think that we want to support the two user-defined blocks in KS X 1001.
I'm not sure about U+0080 and U+F8F7. 

However, I believe that quite many (NOT all) of 'decoding only' entries had
better be supported. 


[1]
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/icu/source/data/mappings/windows-949-2000.ucm&q=windows-949-2000.ucm&sq=package:chromium&type=cs
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