Line data Source code
1 : /*
2 : * conversion between BIG5 and Mule Internal Code(CNS 116643-1992
3 : * plane 1 and plane 2).
4 : * This program is partially copied from lv(Multilingual file viewer)
5 : * and slightly modified. lv is written and copyrighted by NARITA Tomio
6 : * (nrt@web.ad.jp).
7 : *
8 : * 1999/1/15 Tatsuo Ishii
9 : *
10 : * src/backend/utils/mb/conversion_procs/euc_tw_and_big5/big5.c
11 : */
12 :
13 : /* can be used in either frontend or backend */
14 : #include "postgres_fe.h"
15 :
16 : #include "mb/pg_wchar.h"
17 :
18 : typedef struct
19 : {
20 : unsigned short code,
21 : peer;
22 : } codes_t;
23 :
24 : /* map Big5 Level 1 to CNS 11643-1992 Plane 1 */
25 : static const codes_t big5Level1ToCnsPlane1[25] = { /* range */
26 : {0xA140, 0x2121},
27 : {0xA1F6, 0x2258},
28 : {0xA1F7, 0x2257},
29 : {0xA1F8, 0x2259},
30 : {0xA2AF, 0x2421},
31 : {0xA3C0, 0x4221},
32 : {0xa3e1, 0x0000},
33 : {0xA440, 0x4421},
34 : {0xACFE, 0x5753},
35 : {0xacff, 0x0000},
36 : {0xAD40, 0x5323},
37 : {0xAFD0, 0x5754},
38 : {0xBBC8, 0x6B51},
39 : {0xBE52, 0x6B50},
40 : {0xBE53, 0x6F5C},
41 : {0xC1AB, 0x7536},
42 : {0xC2CB, 0x7535},
43 : {0xC2CC, 0x7737},
44 : {0xC361, 0x782E},
45 : {0xC3B9, 0x7865},
46 : {0xC3BA, 0x7864},
47 : {0xC3BB, 0x7866},
48 : {0xC456, 0x782D},
49 : {0xC457, 0x7962},
50 : {0xc67f, 0x0000}
51 : };
52 :
53 : /* map CNS 11643-1992 Plane 1 to Big5 Level 1 */
54 : static const codes_t cnsPlane1ToBig5Level1[26] = { /* range */
55 : {0x2121, 0xA140},
56 : {0x2257, 0xA1F7},
57 : {0x2258, 0xA1F6},
58 : {0x2259, 0xA1F8},
59 : {0x234f, 0x0000},
60 : {0x2421, 0xA2AF},
61 : {0x2571, 0x0000},
62 : {0x4221, 0xA3C0},
63 : {0x4242, 0x0000},
64 : {0x4421, 0xA440},
65 : {0x5323, 0xAD40},
66 : {0x5753, 0xACFE},
67 : {0x5754, 0xAFD0},
68 : {0x6B50, 0xBE52},
69 : {0x6B51, 0xBBC8},
70 : {0x6F5C, 0xBE53},
71 : {0x7535, 0xC2CB},
72 : {0x7536, 0xC1AB},
73 : {0x7737, 0xC2CC},
74 : {0x782D, 0xC456},
75 : {0x782E, 0xC361},
76 : {0x7864, 0xC3BA},
77 : {0x7865, 0xC3B9},
78 : {0x7866, 0xC3BB},
79 : {0x7962, 0xC457},
80 : {0x7d4c, 0x0000}
81 : };
82 :
83 : /* map Big5 Level 2 to CNS 11643-1992 Plane 2 */
84 : static const codes_t big5Level2ToCnsPlane2[48] = { /* range */
85 : {0xC940, 0x2121},
86 : {0xc94a, 0x0000},
87 : {0xC94B, 0x212B},
88 : {0xC96C, 0x214D},
89 : {0xC9BE, 0x214C},
90 : {0xC9BF, 0x217D},
91 : {0xC9ED, 0x224E},
92 : {0xCAF7, 0x224D},
93 : {0xCAF8, 0x2439},
94 : {0xD77A, 0x3F6A},
95 : {0xD77B, 0x387E},
96 : {0xDBA7, 0x3F6B},
97 : {0xDDFC, 0x4176},
98 : {0xDDFD, 0x4424},
99 : {0xE8A3, 0x554C},
100 : {0xE976, 0x5723},
101 : {0xEB5B, 0x5A29},
102 : {0xEBF1, 0x554B},
103 : {0xEBF2, 0x5B3F},
104 : {0xECDE, 0x5722},
105 : {0xECDF, 0x5C6A},
106 : {0xEDAA, 0x5D75},
107 : {0xEEEB, 0x642F},
108 : {0xEEEC, 0x6039},
109 : {0xF056, 0x5D74},
110 : {0xF057, 0x6243},
111 : {0xF0CB, 0x5A28},
112 : {0xF0CC, 0x6337},
113 : {0xF163, 0x6430},
114 : {0xF16B, 0x6761},
115 : {0xF16C, 0x6438},
116 : {0xF268, 0x6934},
117 : {0xF269, 0x6573},
118 : {0xF2C3, 0x664E},
119 : {0xF375, 0x6762},
120 : {0xF466, 0x6935},
121 : {0xF4B5, 0x664D},
122 : {0xF4B6, 0x6962},
123 : {0xF4FD, 0x6A4C},
124 : {0xF663, 0x6A4B},
125 : {0xF664, 0x6C52},
126 : {0xF977, 0x7167},
127 : {0xF9C4, 0x7166},
128 : {0xF9C5, 0x7234},
129 : {0xF9C6, 0x7240},
130 : {0xF9C7, 0x7235},
131 : {0xF9D2, 0x7241},
132 : {0xf9d6, 0x0000}
133 : };
134 :
135 : /* map CNS 11643-1992 Plane 2 to Big5 Level 2 */
136 : static const codes_t cnsPlane2ToBig5Level2[49] = { /* range */
137 : {0x2121, 0xC940},
138 : {0x212B, 0xC94B},
139 : {0x214C, 0xC9BE},
140 : {0x214D, 0xC96C},
141 : {0x217D, 0xC9BF},
142 : {0x224D, 0xCAF7},
143 : {0x224E, 0xC9ED},
144 : {0x2439, 0xCAF8},
145 : {0x387E, 0xD77B},
146 : {0x3F6A, 0xD77A},
147 : {0x3F6B, 0xDBA7},
148 : {0x4424, 0x0000},
149 : {0x4176, 0xDDFC},
150 : {0x4177, 0x0000},
151 : {0x4424, 0xDDFD},
152 : {0x554B, 0xEBF1},
153 : {0x554C, 0xE8A3},
154 : {0x5722, 0xECDE},
155 : {0x5723, 0xE976},
156 : {0x5A28, 0xF0CB},
157 : {0x5A29, 0xEB5B},
158 : {0x5B3F, 0xEBF2},
159 : {0x5C6A, 0xECDF},
160 : {0x5D74, 0xF056},
161 : {0x5D75, 0xEDAA},
162 : {0x6039, 0xEEEC},
163 : {0x6243, 0xF057},
164 : {0x6337, 0xF0CC},
165 : {0x642F, 0xEEEB},
166 : {0x6430, 0xF163},
167 : {0x6438, 0xF16C},
168 : {0x6573, 0xF269},
169 : {0x664D, 0xF4B5},
170 : {0x664E, 0xF2C3},
171 : {0x6761, 0xF16B},
172 : {0x6762, 0xF375},
173 : {0x6934, 0xF268},
174 : {0x6935, 0xF466},
175 : {0x6962, 0xF4B6},
176 : {0x6A4B, 0xF663},
177 : {0x6A4C, 0xF4FD},
178 : {0x6C52, 0xF664},
179 : {0x7166, 0xF9C4},
180 : {0x7167, 0xF977},
181 : {0x7234, 0xF9C5},
182 : {0x7235, 0xF9C7},
183 : {0x7240, 0xF9C6},
184 : {0x7241, 0xF9D2},
185 : {0x7245, 0x0000}
186 : };
187 :
188 : /* Big Five Level 1 Correspondence to CNS 11643-1992 Plane 4 */
189 : static const unsigned short b1c4[][2] = {
190 : {0xC879, 0x2123},
191 : {0xC87B, 0x2124},
192 : {0xC87D, 0x212A},
193 : {0xC8A2, 0x2152}
194 : };
195 :
196 : /* Big Five Level 2 Correspondence to CNS 11643-1992 Plane 3 */
197 : static const unsigned short b2c3[][2] = {
198 : {0xF9D6, 0x4337},
199 : {0xF9D7, 0x4F50},
200 : {0xF9D8, 0x444E},
201 : {0xF9D9, 0x504A},
202 : {0xF9DA, 0x2C5D},
203 : {0xF9DB, 0x3D7E},
204 : {0xF9DC, 0x4B5C}
205 : };
206 :
207 90 : static unsigned short BinarySearchRange
208 : (const codes_t *array, int high, unsigned short code)
209 : {
210 : int low,
211 : mid,
212 : distance,
213 : tmp;
214 :
215 90 : low = 0;
216 90 : mid = high >> 1;
217 :
218 198 : for (; low <= high; mid = (low + high) >> 1)
219 : {
220 198 : if ((array[mid].code <= code) && (array[mid + 1].code > code))
221 : {
222 90 : if (0 == array[mid].peer)
223 0 : return 0;
224 90 : if (code >= 0xa140U)
225 : {
226 : /* big5 to cns */
227 72 : tmp = ((code & 0xff00) - (array[mid].code & 0xff00)) >> 8;
228 72 : high = code & 0x00ff;
229 72 : low = array[mid].code & 0x00ff;
230 :
231 : /*
232 : * NOTE: big5 high_byte: 0xa1-0xfe, low_byte: 0x40-0x7e,
233 : * 0xa1-0xfe (radicals: 0x00-0x3e, 0x3f-0x9c) big5 radix is
234 : * 0x9d. [region_low, region_high] We
235 : * should remember big5 has two different regions (above).
236 : * There is a bias for the distance between these regions.
237 : * 0xa1 - 0x7e + bias = 1 (Distance between 0xa1 and 0x7e is
238 : * 1.) bias = - 0x22.
239 : */
240 144 : distance = tmp * 0x9d + high - low +
241 0 : (high >= 0xa1 ? (low >= 0xa1 ? 0 : -0x22)
242 72 : : (low >= 0xa1 ? +0x22 : 0));
243 :
244 : /*
245 : * NOTE: we have to convert the distance into a code point.
246 : * The code point's low_byte is 0x21 plus mod_0x5e. In the
247 : * first, we extract the mod_0x5e of the starting code point,
248 : * subtracting 0x21, and add distance to it. Then we calculate
249 : * again mod_0x5e of them, and restore the final codepoint,
250 : * adding 0x21.
251 : */
252 72 : tmp = (array[mid].peer & 0x00ff) + distance - 0x21;
253 72 : tmp = (array[mid].peer & 0xff00) + ((tmp / 0x5e) << 8)
254 72 : + 0x21 + tmp % 0x5e;
255 72 : return tmp;
256 : }
257 : else
258 : {
259 : /* cns to big5 */
260 18 : tmp = ((code & 0xff00) - (array[mid].code & 0xff00)) >> 8;
261 :
262 : /*
263 : * NOTE: ISO charsets ranges between 0x21-0xfe (94charset).
264 : * Its radix is 0x5e. But there is no distance bias like big5.
265 : */
266 18 : distance = tmp * 0x5e
267 18 : + ((int) (code & 0x00ff) - (int) (array[mid].code & 0x00ff));
268 :
269 : /*
270 : * NOTE: Similar to big5 to cns conversion, we extract
271 : * mod_0x9d and restore mod_0x9d into a code point.
272 : */
273 18 : low = array[mid].peer & 0x00ff;
274 18 : tmp = low + distance - (low >= 0xa1 ? 0x62 : 0x40);
275 18 : low = tmp % 0x9d;
276 36 : tmp = (array[mid].peer & 0xff00) + ((tmp / 0x9d) << 8)
277 18 : + (low > 0x3e ? 0x62 : 0x40) + low;
278 18 : return tmp;
279 : }
280 : }
281 108 : else if (array[mid].code > code)
282 72 : high = mid - 1;
283 : else
284 36 : low = mid + 1;
285 : }
286 :
287 0 : return 0;
288 : }
289 :
290 :
291 : unsigned short
292 72 : BIG5toCNS(unsigned short big5, unsigned char *lc)
293 : {
294 72 : unsigned short cns = 0;
295 : int i;
296 :
297 72 : if (big5 < 0xc940U)
298 : {
299 : /* level 1 */
300 :
301 360 : for (i = 0; i < sizeof(b1c4) / (sizeof(unsigned short) * 2); i++)
302 : {
303 288 : if (b1c4[i][0] == big5)
304 : {
305 0 : *lc = LC_CNS11643_4;
306 0 : return (b1c4[i][1] | 0x8080U);
307 : }
308 : }
309 :
310 72 : if (0 < (cns = BinarySearchRange(big5Level1ToCnsPlane1, 23, big5)))
311 72 : *lc = LC_CNS11643_1;
312 : }
313 0 : else if (big5 == 0xc94aU)
314 : {
315 : /* level 2 */
316 0 : *lc = LC_CNS11643_1;
317 0 : cns = 0x4442;
318 : }
319 : else
320 : {
321 : /* level 2 */
322 0 : for (i = 0; i < sizeof(b2c3) / (sizeof(unsigned short) * 2); i++)
323 : {
324 0 : if (b2c3[i][0] == big5)
325 : {
326 0 : *lc = LC_CNS11643_3;
327 0 : return (b2c3[i][1] | 0x8080U);
328 : }
329 : }
330 :
331 0 : if (0 < (cns = BinarySearchRange(big5Level2ToCnsPlane2, 46, big5)))
332 0 : *lc = LC_CNS11643_2;
333 : }
334 :
335 72 : if (0 == cns)
336 : { /* no mapping Big5 to CNS 11643-1992 */
337 0 : *lc = 0;
338 0 : return (unsigned short) '?';
339 : }
340 :
341 72 : return cns | 0x8080;
342 : }
343 :
344 : unsigned short
345 18 : CNStoBIG5(unsigned short cns, unsigned char lc)
346 : {
347 : int i;
348 18 : unsigned int big5 = 0;
349 :
350 18 : cns &= 0x7f7f;
351 :
352 18 : switch (lc)
353 : {
354 18 : case LC_CNS11643_1:
355 18 : big5 = BinarySearchRange(cnsPlane1ToBig5Level1, 24, cns);
356 18 : break;
357 0 : case LC_CNS11643_2:
358 0 : big5 = BinarySearchRange(cnsPlane2ToBig5Level2, 47, cns);
359 0 : break;
360 0 : case LC_CNS11643_3:
361 0 : for (i = 0; i < sizeof(b2c3) / (sizeof(unsigned short) * 2); i++)
362 : {
363 0 : if (b2c3[i][1] == cns)
364 0 : return b2c3[i][0];
365 : }
366 0 : break;
367 0 : case LC_CNS11643_4:
368 0 : for (i = 0; i < sizeof(b1c4) / (sizeof(unsigned short) * 2); i++)
369 : {
370 0 : if (b1c4[i][1] == cns)
371 0 : return b1c4[i][0];
372 : }
373 : default:
374 0 : break;
375 : }
376 18 : return big5;
377 : }
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