2004-01-17 10:29:29 -04:00
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To generate or modify mapping headers
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-------------------------------------
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2020-04-29 14:34:24 -03:00
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Mapping headers are generated from Tools/unicode/genmap_*.py
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2004-01-17 10:29:29 -04:00
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2019-07-30 19:16:13 -03:00
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Notes on implementation characteristics of each codecs
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2004-01-17 10:29:29 -04:00
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-----------------------------------------------------
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1) Big5 codec
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The big5 codec maps the following characters as cp950 does rather
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than conforming Unicode.org's that maps to 0xFFFD.
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BIG5 Unicode Description
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0xA15A 0x2574 SPACING UNDERSCORE
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0xA1C3 0xFFE3 SPACING HEAVY OVERSCORE
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0xA1C5 0x02CD SPACING HEAVY UNDERSCORE
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0xA1FE 0xFF0F LT DIAG UP RIGHT TO LOW LEFT
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0xA240 0xFF3C LT DIAG UP LEFT TO LOW RIGHT
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0xA2CC 0x5341 HANGZHOU NUMERAL TEN
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0xA2CE 0x5345 HANGZHOU NUMERAL THIRTY
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Because unicode 0x5341, 0x5345, 0xFF0F, 0xFF3C is mapped to another
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big5 codes already, a roundtrip compatibility is not guaranteed for
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them.
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2) cp932 codec
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To conform to Windows's real mapping, cp932 codec maps the following
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codepoints in addition of the official cp932 mapping.
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CP932 Unicode Description
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0x80 0x80 UNDEFINED
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0xA0 0xF8F0 UNDEFINED
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0xFD 0xF8F1 UNDEFINED
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0xFE 0xF8F2 UNDEFINED
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0xFF 0xF8F3 UNDEFINED
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3) euc-jisx0213 codec
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The euc-jisx0213 codec maps JIS X 0213 Plane 1 code 0x2140 into
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unicode U+FF3C instead of U+005C as on unicode.org's mapping.
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Because euc-jisx0213 has REVERSE SOLIDUS on 0x5c already and A140
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is shown as a full width character, mapping to U+FF3C can make
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more sense.
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The euc-jisx0213 codec is enabled to decode JIS X 0212 codes on
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codeset 2. Because JIS X 0212 and JIS X 0213 Plane 2 don't have
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overlapped by each other, it doesn't bother standard conformations
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(and JIS X 0213 Plane 2 is intended to use so.) On encoding
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sessions, the codec will try to encode kanji characters in this
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order:
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JIS X 0213 Plane 1 -> JIS X 0213 Plane 2 -> JIS X 0212
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4) euc-jp codec
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The euc-jp codec is a compatibility instance on these points:
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- U+FF3C FULLWIDTH REVERSE SOLIDUS is mapped to EUC-JP A1C0 (vice versa)
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- U+00A5 YEN SIGN is mapped to EUC-JP 0x5c. (one way)
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- U+203E OVERLINE is mapped to EUC-JP 0x7e. (one way)
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5) shift-jis codec
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The shift-jis codec is mapping 0x20-0x7e area to U+20-U+7E directly
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instead of using JIS X 0201 for compatibility. The differences are:
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- U+005C REVERSE SOLIDUS is mapped to SHIFT-JIS 0x5c.
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- U+007E TILDE is mapped to SHIFT-JIS 0x7e.
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- U+FF3C FULL-WIDTH REVERSE SOLIDUS is mapped to SHIFT-JIS 815f.
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