projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 7eb75bcc DM |
1 | To generate or modify mapping headers\r |
| 2 | -------------------------------------\r | |
| 3 | Mapping headers are imported from CJKCodecs as pre-generated form.\r | |
| 4 | If you need to tweak or add something on it, please look at tools/\r | |
| 5 | subdirectory of CJKCodecs' distribution.\r | |
| 6 | \r | |
| 7 | \r | |
| 8 | \r | |
| 9 | Notes on implmentation characteristics of each codecs\r | |
| 10 | -----------------------------------------------------\r | |
| 11 | \r | |
| 12 | 1) Big5 codec\r | |
| 13 | \r | |
| 14 | The big5 codec maps the following characters as cp950 does rather\r | |
| 15 | than conforming Unicode.org's that maps to 0xFFFD.\r | |
| 16 | \r | |
| 17 | BIG5 Unicode Description\r | |
| 18 | \r | |
| 19 | 0xA15A 0x2574 SPACING UNDERSCORE\r | |
| 20 | 0xA1C3 0xFFE3 SPACING HEAVY OVERSCORE\r | |
| 21 | 0xA1C5 0x02CD SPACING HEAVY UNDERSCORE\r | |
| 22 | 0xA1FE 0xFF0F LT DIAG UP RIGHT TO LOW LEFT\r | |
| 23 | 0xA240 0xFF3C LT DIAG UP LEFT TO LOW RIGHT\r | |
| 24 | 0xA2CC 0x5341 HANGZHOU NUMERAL TEN\r | |
| 25 | 0xA2CE 0x5345 HANGZHOU NUMERAL THIRTY\r | |
| 26 | \r | |
| 27 | Because unicode 0x5341, 0x5345, 0xFF0F, 0xFF3C is mapped to another\r | |
| 28 | big5 codes already, a roundtrip compatibility is not guaranteed for\r | |
| 29 | them.\r | |
| 30 | \r | |
| 31 | \r | |
| 32 | 2) cp932 codec\r | |
| 33 | \r | |
| 34 | To conform to Windows's real mapping, cp932 codec maps the following\r | |
| 35 | codepoints in addition of the official cp932 mapping.\r | |
| 36 | \r | |
| 37 | CP932 Unicode Description\r | |
| 38 | \r | |
| 39 | 0x80 0x80 UNDEFINED\r | |
| 40 | 0xA0 0xF8F0 UNDEFINED\r | |
| 41 | 0xFD 0xF8F1 UNDEFINED\r | |
| 42 | 0xFE 0xF8F2 UNDEFINED\r | |
| 43 | 0xFF 0xF8F3 UNDEFINED\r | |
| 44 | \r | |
| 45 | \r | |
| 46 | 3) euc-jisx0213 codec\r | |
| 47 | \r | |
| 48 | The euc-jisx0213 codec maps JIS X 0213 Plane 1 code 0x2140 into\r | |
| 49 | unicode U+FF3C instead of U+005C as on unicode.org's mapping.\r | |
| 50 | Because euc-jisx0213 has REVERSE SOLIDUS on 0x5c already and A140\r | |
| 51 | is shown as a full width character, mapping to U+FF3C can make\r | |
| 52 | more sense.\r | |
| 53 | \r | |
| 54 | The euc-jisx0213 codec is enabled to decode JIS X 0212 codes on\r | |
| 55 | codeset 2. Because JIS X 0212 and JIS X 0213 Plane 2 don't have\r | |
| 56 | overlapped by each other, it doesn't bother standard conformations\r | |
| 57 | (and JIS X 0213 Plane 2 is intended to use so.) On encoding\r | |
| 58 | sessions, the codec will try to encode kanji characters in this\r | |
| 59 | order:\r | |
| 60 | \r | |
| 61 | JIS X 0213 Plane 1 -> JIS X 0213 Plane 2 -> JIS X 0212\r | |
| 62 | \r | |
| 63 | \r | |
| 64 | 4) euc-jp codec\r | |
| 65 | \r | |
| 66 | The euc-jp codec is a compatibility instance on these points:\r | |
| 67 | - U+FF3C FULLWIDTH REVERSE SOLIDUS is mapped to EUC-JP A1C0 (vice versa)\r | |
| 68 | - U+00A5 YEN SIGN is mapped to EUC-JP 0x5c. (one way)\r | |
| 69 | - U+203E OVERLINE is mapped to EUC-JP 0x7e. (one way)\r | |
| 70 | \r | |
| 71 | \r | |
| 72 | 5) shift-jis codec\r | |
| 73 | \r | |
| 74 | The shift-jis codec is mapping 0x20-0x7e area to U+20-U+7E directly\r | |
| 75 | instead of using JIS X 0201 for compatibility. The differences are:\r | |
| 76 | - U+005C REVERSE SOLIDUS is mapped to SHIFT-JIS 0x5c.\r | |
| 77 | - U+007E TILDE is mapped to SHIFT-JIS 0x7e.\r | |
| 78 | - U+FF3C FULL-WIDTH REVERSE SOLIDUS is mapped to SHIFT-JIS 815f.\r | |
| 79 | \r |