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README

      1 To generate or modify mapping headers
      2 -------------------------------------
      3 Mapping headers are imported from CJKCodecs as pre-generated form.
      4 If you need to tweak or add something on it, please look at tools/
      5 subdirectory of CJKCodecs' distribution.
      6 
      7 
      8 
      9 Notes on implmentation characteristics of each codecs
     10 -----------------------------------------------------
     11 
     12 1) Big5 codec
     13 
     14   The big5 codec maps the following characters as cp950 does rather
     15   than conforming Unicode.org's that maps to 0xFFFD.
     16 
     17     BIG5        Unicode     Description
     18 
     19     0xA15A      0x2574      SPACING UNDERSCORE
     20     0xA1C3      0xFFE3      SPACING HEAVY OVERSCORE
     21     0xA1C5      0x02CD      SPACING HEAVY UNDERSCORE
     22     0xA1FE      0xFF0F      LT DIAG UP RIGHT TO LOW LEFT
     23     0xA240      0xFF3C      LT DIAG UP LEFT TO LOW RIGHT
     24     0xA2CC      0x5341      HANGZHOU NUMERAL TEN
     25     0xA2CE      0x5345      HANGZHOU NUMERAL THIRTY
     26 
     27   Because unicode 0x5341, 0x5345, 0xFF0F, 0xFF3C is mapped to another
     28   big5 codes already, a roundtrip compatibility is not guaranteed for
     29   them.
     30 
     31 
     32 2) cp932 codec
     33 
     34   To conform to Windows's real mapping, cp932 codec maps the following
     35   codepoints in addition of the official cp932 mapping.
     36 
     37     CP932     Unicode     Description
     38 
     39     0x80      0x80        UNDEFINED
     40     0xA0      0xF8F0      UNDEFINED
     41     0xFD      0xF8F1      UNDEFINED
     42     0xFE      0xF8F2      UNDEFINED
     43     0xFF      0xF8F3      UNDEFINED
     44 
     45 
     46 3) euc-jisx0213 codec
     47 
     48   The euc-jisx0213 codec maps JIS X 0213 Plane 1 code 0x2140 into
     49   unicode U+FF3C instead of U+005C as on unicode.org's mapping.
     50   Because euc-jisx0213 has REVERSE SOLIDUS on 0x5c already and A140
     51   is shown as a full width character, mapping to U+FF3C can make
     52   more sense.
     53 
     54   The euc-jisx0213 codec is enabled to decode JIS X 0212 codes on
     55   codeset 2. Because JIS X 0212 and JIS X 0213 Plane 2 don't have
     56   overlapped by each other, it doesn't bother standard conformations
     57   (and JIS X 0213 Plane 2 is intended to use so.) On encoding
     58   sessions, the codec will try to encode kanji characters in this
     59   order:
     60 
     61     JIS X 0213 Plane 1 -> JIS X 0213 Plane 2 -> JIS X 0212
     62 
     63 
     64 4) euc-jp codec
     65 
     66   The euc-jp codec is a compatibility instance on these points:
     67    - U+FF3C FULLWIDTH REVERSE SOLIDUS is mapped to EUC-JP A1C0 (vice versa)
     68    - U+00A5 YEN SIGN is mapped to EUC-JP 0x5c. (one way)
     69    - U+203E OVERLINE is mapped to EUC-JP 0x7e. (one way)
     70 
     71 
     72 5) shift-jis codec
     73 
     74   The shift-jis codec is mapping 0x20-0x7e area to U+20-U+7E directly
     75   instead of using JIS X 0201 for compatibility. The differences are:
     76    - U+005C REVERSE SOLIDUS is mapped to SHIFT-JIS 0x5c.
     77    - U+007E TILDE is mapped to SHIFT-JIS 0x7e.
     78    - U+FF3C FULL-WIDTH REVERSE SOLIDUS is mapped to SHIFT-JIS 815f.
     79 
     80