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  1. JDK
  2. JDK-8259791

Align some one-way conversion in MS950 charset with Windows

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    • Icon: CSR CSR
    • Resolution: Approved
    • Icon: P3 P3
    • 11-pool
    • 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.
      (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.

      Before:

      \u2550 -> \xA2\xA4
\u255E -> \xA2\xA5
\u2561 -> \xA2\xA7
\u256A -> \xA2\xA7

      After:

      \u2550 -> \xF9\xF9
\u255E -> \xF9\xE9
\u2561 -> \xF9\xEB
\u256A -> \xF9\xEA


      Definition:
      Traditional Chinese Windows conversion table is:
      https://unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WINDOWS/CP950.TXT
      Newer MS950 definition is:
      https://unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WindowsBestFit/bestfit950.txt

      \u2550, \u255E, \u2561 and \u256A are in BOX DRAWINGS Unicode range.
      (See attached 4Chras.png for font glyphs)

      Specification

      N/A

            kravikumar Kiran Sidhartha Ravikumar (Inactive)
            itakiguchi Ichiroh Takiguchi (Inactive)
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              Created:
              Updated:
              Resolved: