379 lines
7.9 KiB
C
379 lines
7.9 KiB
C
/*
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* conversion between BIG5 and Mule Internal Code(CNS 116643-1992
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* plane 1 and plane 2).
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* This program is partially copied from lv(Multilingual file viewer)
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* and slightly modified. lv is written and copyrighted by NARITA Tomio
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* (nrt@web.ad.jp).
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*
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* 1999/1/15 Tatsuo Ishii
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*
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* $Id: big5.c,v 1.7 2001/02/10 02:31:27 tgl Exp $
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*/
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/* can be used in either frontend or backend */
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#include "postgres_fe.h"
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#include "mb/pg_wchar.h"
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typedef struct
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{
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unsigned short code,
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peer;
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} codes_t;
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/* map Big5 Level 1 to CNS 11643-1992 Plane 1 */
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static codes_t big5Level1ToCnsPlane1[25] = { /* range */
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{0xA140, 0x2121},
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{0xA1F6, 0x2258},
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{0xA1F7, 0x2257},
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{0xA1F8, 0x2259},
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{0xA2AF, 0x2421},
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{0xA3C0, 0x4221},
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{0xa3e1, 0x0000},
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{0xA440, 0x4421},
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{0xACFE, 0x5753},
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{0xacff, 0x0000},
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{0xAD40, 0x5323},
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{0xAFD0, 0x5754},
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{0xBBC8, 0x6B51},
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{0xBE52, 0x6B50},
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{0xBE53, 0x6F5C},
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{0xC1AB, 0x7536},
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{0xC2CB, 0x7535},
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{0xC2CC, 0x7737},
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{0xC361, 0x782E},
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{0xC3B9, 0x7865},
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{0xC3BA, 0x7864},
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{0xC3BB, 0x7866},
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{0xC456, 0x782D},
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{0xC457, 0x7962},
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{0xc67f, 0x0000}
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};
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/* map CNS 11643-1992 Plane 1 to Big5 Level 1 */
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static codes_t cnsPlane1ToBig5Level1[26] = { /* range */
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{0x2121, 0xA140},
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{0x2257, 0xA1F7},
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{0x2258, 0xA1F6},
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{0x2259, 0xA1F8},
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{0x234f, 0x0000},
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{0x2421, 0xA2AF},
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{0x2571, 0x0000},
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{0x4221, 0xA3C0},
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{0x4242, 0x0000},
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{0x4421, 0xA440},
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{0x5323, 0xAD40},
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{0x5753, 0xACFE},
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{0x5754, 0xAFD0},
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{0x6B50, 0xBE52},
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{0x6B51, 0xBBC8},
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{0x6F5C, 0xBE53},
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{0x7535, 0xC2CB},
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{0x7536, 0xC1AB},
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{0x7737, 0xC2CC},
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{0x782D, 0xC456},
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{0x782E, 0xC361},
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{0x7864, 0xC3BA},
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{0x7865, 0xC3B9},
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{0x7866, 0xC3BB},
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{0x7962, 0xC457},
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{0x7d4c, 0x0000}
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};
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/* map Big5 Level 2 to CNS 11643-1992 Plane 2 */
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static codes_t big5Level2ToCnsPlane2[48] = { /* range */
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{0xC940, 0x2121},
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{0xc94a, 0x0000},
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{0xC94B, 0x212B},
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{0xC96C, 0x214D},
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{0xC9BE, 0x214C},
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{0xC9BF, 0x217D},
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{0xC9ED, 0x224E},
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{0xCAF7, 0x224D},
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{0xCAF8, 0x2439},
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{0xD77A, 0x3F6A},
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{0xD77B, 0x387E},
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{0xDBA7, 0x3F6B},
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{0xDDFC, 0x4176},
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{0xDDFD, 0x4424},
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{0xE8A3, 0x554C},
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{0xE976, 0x5723},
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{0xEB5B, 0x5A29},
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{0xEBF1, 0x554B},
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{0xEBF2, 0x5B3F},
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{0xECDE, 0x5722},
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{0xECDF, 0x5C6A},
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{0xEDAA, 0x5D75},
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{0xEEEB, 0x642F},
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{0xEEEC, 0x6039},
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{0xF056, 0x5D74},
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{0xF057, 0x6243},
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{0xF0CB, 0x5A28},
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{0xF0CC, 0x6337},
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{0xF163, 0x6430},
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{0xF16B, 0x6761},
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{0xF16C, 0x6438},
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{0xF268, 0x6934},
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{0xF269, 0x6573},
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{0xF2C3, 0x664E},
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{0xF375, 0x6762},
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{0xF466, 0x6935},
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{0xF4B5, 0x664D},
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{0xF4B6, 0x6962},
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{0xF4FD, 0x6A4C},
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{0xF663, 0x6A4B},
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{0xF664, 0x6C52},
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{0xF977, 0x7167},
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{0xF9C4, 0x7166},
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{0xF9C5, 0x7234},
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{0xF9C6, 0x7240},
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{0xF9C7, 0x7235},
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{0xF9D2, 0x7241},
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{0xf9d6, 0x0000}
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};
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/* map CNS 11643-1992 Plane 2 to Big5 Level 2 */
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static codes_t cnsPlane2ToBig5Level2[49] = { /* range */
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{0x2121, 0xC940},
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{0x212B, 0xC94B},
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{0x214C, 0xC9BE},
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{0x214D, 0xC96C},
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{0x217D, 0xC9BF},
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{0x224D, 0xCAF7},
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{0x224E, 0xC9ED},
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{0x2439, 0xCAF8},
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{0x387E, 0xD77B},
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{0x3F6A, 0xD77A},
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{0x3F6B, 0xDBA7},
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{0x4424, 0x0000},
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{0x4176, 0xDDFC},
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{0x4177, 0x0000},
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{0x4424, 0xDDFD},
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{0x554B, 0xEBF1},
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{0x554C, 0xE8A3},
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{0x5722, 0xECDE},
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{0x5723, 0xE976},
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{0x5A28, 0xF0CB},
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{0x5A29, 0xEB5B},
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{0x5B3F, 0xEBF2},
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{0x5C6A, 0xECDF},
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{0x5D74, 0xF056},
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{0x5D75, 0xEDAA},
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{0x6039, 0xEEEC},
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{0x6243, 0xF057},
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{0x6337, 0xF0CC},
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{0x642F, 0xEEEB},
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{0x6430, 0xF163},
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{0x6438, 0xF16C},
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{0x6573, 0xF269},
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{0x664D, 0xF4B5},
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{0x664E, 0xF2C3},
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{0x6761, 0xF16B},
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{0x6762, 0xF375},
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{0x6934, 0xF268},
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{0x6935, 0xF466},
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{0x6962, 0xF4B6},
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{0x6A4B, 0xF663},
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{0x6A4C, 0xF4FD},
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{0x6C52, 0xF664},
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{0x7166, 0xF9C4},
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{0x7167, 0xF977},
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{0x7234, 0xF9C5},
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{0x7235, 0xF9C7},
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{0x7240, 0xF9C6},
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{0x7241, 0xF9D2},
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{0x7245, 0x0000}
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};
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/* Big Five Level 1 Correspondence to CNS 11643-1992 Plane 4 */
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static unsigned short b1c4[][2] = {
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{0xC879, 0x2123},
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{0xC87B, 0x2124},
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{0xC87D, 0x212A},
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{0xC8A2, 0x2152}
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};
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/* Big Five Level 2 Correspondence to CNS 11643-1992 Plane 3 */
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static unsigned short b2c3[][2] = {
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{0xF9D6, 0x4337},
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{0xF9D7, 0x4F50},
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{0xF9D8, 0x444E},
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{0xF9D9, 0x504A},
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{0xF9DA, 0x2C5D},
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{0xF9DB, 0x3D7E},
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{0xF9DC, 0x4B5C}
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};
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static unsigned short BinarySearchRange
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(codes_t * array, int high, unsigned short code)
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{
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int low,
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mid,
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distance,
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tmp;
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low = 0;
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mid = high >> 1;
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for (; low <= high; mid = (low + high) >> 1)
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{
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if ((array[mid].code <= code) && (array[mid + 1].code > code))
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{
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if (0 == array[mid].peer)
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return 0;
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if (code >= 0xa140U)
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{
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/* big5 to cns */
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tmp = ((code & 0xff00) - (array[mid].code & 0xff00)) >> 8;
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high = code & 0x00ff;
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low = array[mid].code & 0x00ff;
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/*
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* NOTE: big5 high_byte: 0xa1-0xfe, low_byte: 0x40-0x7e,
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* 0xa1-0xfe (radicals: 0x00-0x3e, 0x3f-0x9c) big5 radix
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* is 0x9d. [region_low, region_high]
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* We should remember big5 has two different regions
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* (above). There is a bias for the distance between these
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* regions. 0xa1 - 0x7e + bias = 1 (Distance between 0xa1
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* and 0x7e is 1.) bias = - 0x22.
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*/
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distance = tmp * 0x9d + high - low +
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(high >= 0xa1 ? (low >= 0xa1 ? 0 : -0x22)
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: (low >= 0xa1 ? +0x22 : 0));
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/*
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* NOTE: we have to convert the distance into a code
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* point. The code point's low_byte is 0x21 plus mod_0x5e.
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* In the first, we extract the mod_0x5e of the starting
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* code point, subtracting 0x21, and add distance to it.
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* Then we calculate again mod_0x5e of them, and restore
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* the final codepoint, adding 0x21.
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*/
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tmp = (array[mid].peer & 0x00ff) + distance - 0x21;
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tmp = (array[mid].peer & 0xff00) + ((tmp / 0x5e) << 8)
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+ 0x21 + tmp % 0x5e;
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return tmp;
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}
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else
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{
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/* cns to big5 */
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tmp = ((code & 0xff00) - (array[mid].code & 0xff00)) >> 8;
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/*
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* NOTE: ISO charsets ranges between 0x21-0xfe
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* (94charset). Its radix is 0x5e. But there is no
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* distance bias like big5.
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*/
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distance = tmp * 0x5e
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+ ((int) (code & 0x00ff) - (int) (array[mid].code & 0x00ff));
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/*
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* NOTE: Similar to big5 to cns conversion, we extract
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* mod_0x9d and restore mod_0x9d into a code point.
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*/
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low = array[mid].peer & 0x00ff;
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tmp = low + distance - (low >= 0xa1 ? 0x62 : 0x40);
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low = tmp % 0x9d;
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tmp = (array[mid].peer & 0xff00) + ((tmp / 0x9d) << 8)
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+ (low > 0x3e ? 0x62 : 0x40) + low;
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return tmp;
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}
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}
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else if (array[mid].code > code)
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high = mid - 1;
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else
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low = mid + 1;
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}
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return 0;
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}
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unsigned short
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BIG5toCNS(unsigned short big5, unsigned char *lc)
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{
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unsigned short cns = 0;
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int i;
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if (big5 < 0xc940U)
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{
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/* level 1 */
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for (i = 0; i < sizeof(b1c4) / sizeof(unsigned short); i++)
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{
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if (b1c4[i][0] == big5)
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{
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*lc = LC_CNS11643_4;
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return (b1c4[i][1] | 0x8080U);
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}
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}
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if (0 < (cns = BinarySearchRange(big5Level1ToCnsPlane1, 23, big5)))
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*lc = LC_CNS11643_1;
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}
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else if (big5 == 0xc94aU)
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{
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/* level 2 */
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*lc = LC_CNS11643_1;
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cns = 0x4442;
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}
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else
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{
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/* level 2 */
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for (i = 0; i < sizeof(b2c3) / sizeof(unsigned short); i++)
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{
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if (b2c3[i][0] == big5)
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{
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*lc = LC_CNS11643_3;
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return (b2c3[i][1] | 0x8080U);
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}
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}
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if (0 < (cns = BinarySearchRange(big5Level2ToCnsPlane2, 46, big5)))
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*lc = LC_CNS11643_2;
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}
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if (0 == cns)
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{ /* no mapping Big5 to CNS 11643-1992 */
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*lc = 0;
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return (unsigned short) '?';
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}
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return cns | 0x8080;
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}
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unsigned short
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CNStoBIG5(unsigned short cns, unsigned char lc)
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{
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int i;
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unsigned int big5 = 0;
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cns &= 0x7f7f;
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switch (lc)
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{
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case LC_CNS11643_1:
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big5 = BinarySearchRange(cnsPlane1ToBig5Level1, 24, cns);
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break;
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case LC_CNS11643_2:
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big5 = BinarySearchRange(cnsPlane2ToBig5Level2, 47, cns);
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break;
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case LC_CNS11643_3:
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for (i = 0; i < sizeof(b2c3) / sizeof(unsigned short); i++)
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{
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if (b2c3[i][1] == cns)
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return (b2c3[i][0]);
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}
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break;
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case LC_CNS11643_4:
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for (i = 0; i < sizeof(b1c4) / sizeof(unsigned short); i++)
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{
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if (b1c4[i][1] == cns)
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return (b1c4[i][0]);
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}
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default:
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break;
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}
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return big5;
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}
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