Align some one-way conversion in MS950 charset with Windows

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    • Type: CSR
    • Resolution: Approved
    • Priority: P3
    • 11-pool
    • Component/s: core-libs
    • None
    • behavioral
    • low
    • Hide
      Applications that expect the existing mapping for those one-way conversion code points will not work. Since these are uncommon box character code points, the risk is low. It should be best avoided to introduce a property to switch back to the old behavior.
      Show
      Applications that expect the existing mapping for those one-way conversion code points will not work. Since these are uncommon box character code points, the risk is low. It should be best avoided to introduce a property to switch back to the old behavior.
    • Java API
    • Implementation

      Summary

      MS950 charset encoder behaves differently as defined in the Traditional Chinese Windows specification

      Problem

      Windows code page 950 has some n:1 byte-to-char mappings for certain code points. In JDK's MS950 charset, there are 4 char-to-byte mappings differ from Traditional Chinese Windows.<br> (Actual issue was in https://bugs.openjdk.java.net/browse/JDK-8232161)

      Solution

      I recommend that following 4 char-to-byte mappings need to change.<br> <br> Before:

      <pre> \u2550 -> \xA2\xA4 \u255E -> \xA2\xA5 \u2561 -> \xA2\xA7 \u256A -> \xA2\xA7 </pre>

      After:

      <pre> \u2550 -> \xF9\xF9 \u255E -> \xF9\xE9 \u2561 -> \xF9\xEB \u256A -> \xF9\xEA </pre>

      <br> Definition:<br> Traditional Chinese Windows conversion table is:<br> https://unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WINDOWS/CP950.TXT<br> Newer MS950 definition is:<br> https://unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WindowsBestFit/bestfit950.txt<br> <br> \u2550, \u255E, \u2561 and \u256A are in BOX DRAWINGS Unicode range.<br> (See attached 4Chras.png for font glyphs)<br>

      Specification

      N/A

            Assignee:
            Kiran Sidhartha Ravikumar (Inactive)
            Reporter:
            Ichiroh Takiguchi
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              Created:
              Updated:
              Resolved: