1 /* Conversion from and to EUC-JISX0213.
2 Copyright (C) 2002-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <dlfcn.h>
20 #include <stdint.h>
21 #include <gconv.h>
22
23 /* The structure of EUC-JISX0213 is as follows:
24
25 0x00..0x7F: ASCII
26
27 0x8E{A1..FE}: JISX0201 Katakana, with prefix 0x8E, offset by +0x80.
28
29 0x8F{A1..FE}{A1..FE}: JISX0213 plane 2, with prefix 0x8F, offset by +0x8080.
30
31 0x{A1..FE}{A1..FE}: JISX0213 plane 1, offset by +0x8080.
32
33 Note that some JISX0213 characters are not contained in Unicode 3.2
34 and are therefore best represented as sequences of Unicode characters.
35 */
36
37 #include "jisx0213.h"
38
39 /* Definitions used in the body of the `gconv' function. */
40 #define CHARSET_NAME "EUC-JISX0213//"
41 #define FROM_LOOP from_euc_jisx0213
42 #define TO_LOOP to_euc_jisx0213
43 #define DEFINE_INIT 1
44 #define DEFINE_FINI 1
45 #define ONE_DIRECTION 0
46 #define FROM_LOOP_MIN_NEEDED_FROM 1
47 #define FROM_LOOP_MAX_NEEDED_FROM 3
48 #define FROM_LOOP_MIN_NEEDED_TO 4
49 #define FROM_LOOP_MAX_NEEDED_TO 8
50 #define TO_LOOP_MIN_NEEDED_FROM 4
51 #define TO_LOOP_MAX_NEEDED_FROM 4
52 #define TO_LOOP_MIN_NEEDED_TO 1
53 #define TO_LOOP_MAX_NEEDED_TO 3
54 #define PREPARE_LOOP \
55 int saved_state; \
56 int *statep = &data->__statep->__count;
57 #define EXTRA_LOOP_ARGS , statep
58
59
60 /* Since we might have to reset input pointer we must be able to save
61 and restore the state. */
62 #define SAVE_RESET_STATE(Save) \
63 if (Save) \
64 saved_state = *statep; \
65 else \
66 *statep = saved_state
67
68
69 /* During EUC-JISX0213 to UCS-4 conversion, the COUNT element of the state
70 contains the last UCS-4 character, shifted by 3 bits.
71 During UCS-4 to EUC-JISX0213 conversion, the COUNT element of the state
72 contains the last two bytes to be output, shifted by 3 bits. */
73
74 /* Since this is a stateful encoding we have to provide code which resets
75 the output state to the initial state. This has to be done during the
76 flushing. */
77 #define EMIT_SHIFT_TO_INIT \
78 if (data->__statep->__count != 0) \
79 { \
80 if (FROM_DIRECTION) \
81 { \
82 if (__glibc_likely (outbuf + 4 <= outend)) \
83 { \
84 /* Write out the last character. */ \
85 *((uint32_t *) outbuf) = data->__statep->__count >> 3; \
86 outbuf += sizeof (uint32_t); \
87 data->__statep->__count = 0; \
88 } \
89 else \
90 /* We don't have enough room in the output buffer. */ \
91 status = __GCONV_FULL_OUTPUT; \
92 } \
93 else \
94 { \
95 if (__glibc_likely (outbuf + 2 <= outend)) \
96 { \
97 /* Write out the last character. */ \
98 uint32_t lasttwo = data->__statep->__count >> 3; \
99 *outbuf++ = (lasttwo >> 8) & 0xff; \
100 *outbuf++ = lasttwo & 0xff; \
101 data->__statep->__count = 0; \
102 } \
103 else \
104 /* We don't have enough room in the output buffer. */ \
105 status = __GCONV_FULL_OUTPUT; \
106 } \
107 }
108
109
110 /* First define the conversion function from EUC-JISX0213 to UCS-4. */
111 #define MIN_NEEDED_INPUT FROM_LOOP_MIN_NEEDED_FROM
112 #define MAX_NEEDED_INPUT FROM_LOOP_MAX_NEEDED_FROM
113 #define MIN_NEEDED_OUTPUT FROM_LOOP_MIN_NEEDED_TO
114 #define MAX_NEEDED_OUTPUT FROM_LOOP_MAX_NEEDED_TO
115 #define LOOPFCT FROM_LOOP
116 #define BODY \
117 { \
118 uint32_t ch; \
119 \
120 /* Determine whether there is a buffered character pending. */ \
121 ch = *statep >> 3; \
122 if (__glibc_likely (ch == 0)) \
123 { \
124 /* No - so look at the next input byte. */ \
125 ch = *inptr; \
126 \
127 if (ch < 0x80) \
128 /* Plain ASCII character. */ \
129 ++inptr; \
130 else if ((ch >= 0xa1 && ch <= 0xfe) || ch == 0x8e || ch == 0x8f) \
131 { \
132 /* Two or three byte character. */ \
133 uint32_t ch2; \
134 \
135 if (__glibc_unlikely (inptr + 1 >= inend)) \
136 { \
137 /* The second byte is not available. */ \
138 result = __GCONV_INCOMPLETE_INPUT; \
139 break; \
140 } \
141 \
142 ch2 = inptr[1]; \
143 \
144 /* The second byte must be >= 0xa1 and <= 0xfe. */ \
145 if (__glibc_unlikely (ch2 < 0xa1 || ch2 > 0xfe)) \
146 { \
147 /* This is an illegal character. */ \
148 STANDARD_FROM_LOOP_ERR_HANDLER (1); \
149 } \
150 \
151 if (ch == 0x8e) \
152 { \
153 /* Half-width katakana. */ \
154 if (__glibc_unlikely (ch2 > 0xdf)) \
155 STANDARD_FROM_LOOP_ERR_HANDLER (1); \
156 \
157 ch = ch2 + 0xfec0; \
158 inptr += 2; \
159 } \
160 else \
161 { \
162 const unsigned char *endp; \
163 \
164 if (ch == 0x8f) \
165 { \
166 /* JISX 0213 plane 2. */ \
167 uint32_t ch3; \
168 \
169 if (__glibc_unlikely (inptr + 2 >= inend)) \
170 { \
171 /* The third byte is not available. */ \
172 result = __GCONV_INCOMPLETE_INPUT; \
173 break; \
174 } \
175 \
176 ch3 = inptr[2]; \
177 endp = inptr + 3; \
178 \
179 ch = jisx0213_to_ucs4 (0x200 - 0x80 + ch2, ch3 ^ 0x80); \
180 } \
181 else \
182 { \
183 /* JISX 0213 plane 1. */ \
184 endp = inptr + 2; \
185 \
186 ch = jisx0213_to_ucs4 (0x100 - 0x80 + ch, ch2 ^ 0x80); \
187 } \
188 \
189 if (ch == 0) \
190 /* This is an illegal character. */ \
191 STANDARD_FROM_LOOP_ERR_HANDLER (1); \
192 \
193 inptr = endp; \
194 \
195 if (ch < 0x80) \
196 { \
197 /* It's a combining character. */ \
198 uint32_t u1 = __jisx0213_to_ucs_combining[ch - 1][0]; \
199 uint32_t u2 = __jisx0213_to_ucs_combining[ch - 1][1]; \
200 \
201 put32 (outptr, u1); \
202 outptr += 4; \
203 \
204 /* See whether we have room for two characters. */ \
205 if (outptr + 4 <= outend) \
206 { \
207 put32 (outptr, u2); \
208 outptr += 4; \
209 continue; \
210 } \
211 \
212 /* Otherwise store only the first character now, and \
213 put the second one into the queue. */ \
214 *statep = u2 << 3; \
215 /* Tell the caller why we terminate the loop. */ \
216 result = __GCONV_FULL_OUTPUT; \
217 break; \
218 } \
219 } \
220 } \
221 else \
222 { \
223 /* This is illegal. */ \
224 STANDARD_FROM_LOOP_ERR_HANDLER (1); \
225 } \
226 } \
227 \
228 put32 (outptr, ch); \
229 outptr += 4; \
230 }
231 #define LOOP_NEED_FLAGS
232 #define EXTRA_LOOP_DECLS , int *statep
233 #define ONEBYTE_BODY \
234 { \
235 if (c < 0x80) \
236 return c; \
237 else \
238 return WEOF; \
239 }
240 #include <iconv/loop.c>
241
242
243 /* Next, define the other direction, from UCS-4 to EUC-JISX0213. */
244
245 /* Composition tables for each of the relevant combining characters. */
246 static const struct
247 {
248 uint16_t base;
249 uint16_t composed;
250 } comp_table_data[] =
251 {
252 #define COMP_TABLE_IDX_02E5 0
253 #define COMP_TABLE_LEN_02E5 1
254 { 0xabe4, 0xabe5 }, /* 0x12B65 = 0x12B64 U+02E5 */
255 #define COMP_TABLE_IDX_02E9 (COMP_TABLE_IDX_02E5 + COMP_TABLE_LEN_02E5)
256 #define COMP_TABLE_LEN_02E9 1
257 { 0xabe0, 0xabe6 }, /* 0x12B66 = 0x12B60 U+02E9 */
258 #define COMP_TABLE_IDX_0300 (COMP_TABLE_IDX_02E9 + COMP_TABLE_LEN_02E9)
259 #define COMP_TABLE_LEN_0300 5
260 { 0xa9dc, 0xabc4 }, /* 0x12B44 = 0x1295C U+0300 */
261 { 0xabb8, 0xabc8 }, /* 0x12B48 = 0x12B38 U+0300 */
262 { 0xabb7, 0xabca }, /* 0x12B4A = 0x12B37 U+0300 */
263 { 0xabb0, 0xabcc }, /* 0x12B4C = 0x12B30 U+0300 */
264 { 0xabc3, 0xabce }, /* 0x12B4E = 0x12B43 U+0300 */
265 #define COMP_TABLE_IDX_0301 (COMP_TABLE_IDX_0300 + COMP_TABLE_LEN_0300)
266 #define COMP_TABLE_LEN_0301 4
267 { 0xabb8, 0xabc9 }, /* 0x12B49 = 0x12B38 U+0301 */
268 { 0xabb7, 0xabcb }, /* 0x12B4B = 0x12B37 U+0301 */
269 { 0xabb0, 0xabcd }, /* 0x12B4D = 0x12B30 U+0301 */
270 { 0xabc3, 0xabcf }, /* 0x12B4F = 0x12B43 U+0301 */
271 #define COMP_TABLE_IDX_309A (COMP_TABLE_IDX_0301 + COMP_TABLE_LEN_0301)
272 #define COMP_TABLE_LEN_309A 14
273 { 0xa4ab, 0xa4f7 }, /* 0x12477 = 0x1242B U+309A */
274 { 0xa4ad, 0xa4f8 }, /* 0x12478 = 0x1242D U+309A */
275 { 0xa4af, 0xa4f9 }, /* 0x12479 = 0x1242F U+309A */
276 { 0xa4b1, 0xa4fa }, /* 0x1247A = 0x12431 U+309A */
277 { 0xa4b3, 0xa4fb }, /* 0x1247B = 0x12433 U+309A */
278 { 0xa5ab, 0xa5f7 }, /* 0x12577 = 0x1252B U+309A */
279 { 0xa5ad, 0xa5f8 }, /* 0x12578 = 0x1252D U+309A */
280 { 0xa5af, 0xa5f9 }, /* 0x12579 = 0x1252F U+309A */
281 { 0xa5b1, 0xa5fa }, /* 0x1257A = 0x12531 U+309A */
282 { 0xa5b3, 0xa5fb }, /* 0x1257B = 0x12533 U+309A */
283 { 0xa5bb, 0xa5fc }, /* 0x1257C = 0x1253B U+309A */
284 { 0xa5c4, 0xa5fd }, /* 0x1257D = 0x12544 U+309A */
285 { 0xa5c8, 0xa5fe }, /* 0x1257E = 0x12548 U+309A */
286 { 0xa6f5, 0xa6f8 }, /* 0x12678 = 0x12675 U+309A */
287 };
288
289 #define MIN_NEEDED_INPUT TO_LOOP_MIN_NEEDED_FROM
290 #define MAX_NEEDED_INPUT TO_LOOP_MAX_NEEDED_FROM
291 #define MIN_NEEDED_OUTPUT TO_LOOP_MIN_NEEDED_TO
292 #define MAX_NEEDED_OUTPUT TO_LOOP_MAX_NEEDED_TO
293 #define LOOPFCT TO_LOOP
294 #define BODY \
295 { \
296 uint32_t ch = get32 (inptr); \
297 \
298 if ((*statep >> 3) != 0) \
299 { \
300 /* Attempt to combine the last character with this one. */ \
301 uint16_t lasttwo = *statep >> 3; \
302 unsigned int idx; \
303 unsigned int len; \
304 \
305 if (ch == 0x02e5) \
306 idx = COMP_TABLE_IDX_02E5, len = COMP_TABLE_LEN_02E5; \
307 else if (ch == 0x02e9) \
308 idx = COMP_TABLE_IDX_02E9, len = COMP_TABLE_LEN_02E9; \
309 else if (ch == 0x0300) \
310 idx = COMP_TABLE_IDX_0300, len = COMP_TABLE_LEN_0300; \
311 else if (ch == 0x0301) \
312 idx = COMP_TABLE_IDX_0301, len = COMP_TABLE_LEN_0301; \
313 else if (ch == 0x309a) \
314 idx = COMP_TABLE_IDX_309A, len = COMP_TABLE_LEN_309A; \
315 else \
316 goto not_combining; \
317 \
318 do \
319 if (comp_table_data[idx].base == lasttwo) \
320 break; \
321 while (++idx, --len > 0); \
322 \
323 if (len > 0) \
324 { \
325 /* Output the combined character. */ \
326 if (__glibc_unlikely (outptr + 1 >= outend)) \
327 { \
328 result = __GCONV_FULL_OUTPUT; \
329 break; \
330 } \
331 lasttwo = comp_table_data[idx].composed; \
332 *outptr++ = (lasttwo >> 8) & 0xff; \
333 *outptr++ = lasttwo & 0xff; \
334 *statep = 0; \
335 inptr += 4; \
336 continue; \
337 } \
338 \
339 not_combining: \
340 /* Output the buffered character. */ \
341 if (__glibc_unlikely (outptr + 1 >= outend)) \
342 { \
343 result = __GCONV_FULL_OUTPUT; \
344 break; \
345 } \
346 *outptr++ = (lasttwo >> 8) & 0xff; \
347 *outptr++ = lasttwo & 0xff; \
348 *statep = 0; \
349 continue; \
350 } \
351 \
352 if (ch < 0x80) \
353 /* Plain ASCII character. */ \
354 *outptr++ = ch; \
355 else if (ch >= 0xff61 && ch <= 0xff9f) \
356 { \
357 /* Half-width katakana. */ \
358 if (__glibc_unlikely (outptr + 1 >= outend)) \
359 { \
360 result = __GCONV_FULL_OUTPUT; \
361 break; \
362 } \
363 *outptr++ = 0x8e; \
364 *outptr++ = ch - 0xfec0; \
365 } \
366 else \
367 { \
368 uint32_t jch = ucs4_to_jisx0213 (ch); \
369 if (jch == 0) \
370 { \
371 UNICODE_TAG_HANDLER (ch, 4); \
372 \
373 /* Illegal character. */ \
374 STANDARD_TO_LOOP_ERR_HANDLER (4); \
375 } \
376 \
377 if (jch & 0x0080) \
378 { \
379 /* A possible match in comp_table_data. We have to buffer it. */\
380 \
381 /* We know it's a JISX 0213 plane 1 character. */ \
382 assert ((jch & 0x8000) == 0); \
383 \
384 *statep = (jch | 0x8080) << 3; \
385 inptr += 4; \
386 continue; \
387 } \
388 \
389 if (jch & 0x8000) \
390 { \
391 /* JISX 0213 plane 2. */ \
392 if (__glibc_unlikely (outptr + 2 >= outend)) \
393 { \
394 result = __GCONV_FULL_OUTPUT; \
395 break; \
396 } \
397 *outptr++ = 0x8f; \
398 } \
399 else \
400 { \
401 /* JISX 0213 plane 1. */ \
402 if (__glibc_unlikely (outptr + 1 >= outend)) \
403 { \
404 result = __GCONV_FULL_OUTPUT; \
405 break; \
406 } \
407 } \
408 *outptr++ = (jch >> 8) | 0x80; \
409 *outptr++ = (jch & 0xff) | 0x80; \
410 } \
411 \
412 inptr += 4; \
413 }
414 #define LOOP_NEED_FLAGS
415 #define EXTRA_LOOP_DECLS , int *statep
416 #include <iconv/loop.c>
417
418
419 /* Now define the toplevel functions. */
420 #include <iconv/skeleton.c>