citrus_dechanyu.c revision 282275 
1/* $FreeBSD: stable/10/lib/libiconv_modules/DECHanyu/citrus_dechanyu.c 282275 2015-04-30 16:08:47Z tijl $ */
2/* $NetBSD: citrus_dechanyu.c,v 1.4 2011/11/19 18:20:13 tnozaki Exp $ */
3
4/*-
5 * Copyright (c)2007 Citrus Project,
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29#include <sys/cdefs.h>
30#include <sys/types.h>
31
32#include <assert.h>
33#include <errno.h>
34#include <limits.h>
35#include <stddef.h>
36#include <stdint.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <wchar.h>
41
42#include "citrus_namespace.h"
43#include "citrus_types.h"
44#include "citrus_bcs.h"
45#include "citrus_module.h"
46#include "citrus_stdenc.h"
47#include "citrus_dechanyu.h"
48
49/* ----------------------------------------------------------------------
50 * private stuffs used by templates
51 */
52
53typedef struct {
54	size_t	 chlen;
55	char	 ch[4];
56} _DECHanyuState;
57
58typedef struct {
59	int	 dummy;
60} _DECHanyuEncodingInfo;
61
62#define _CEI_TO_EI(_cei_)		(&(_cei_)->ei)
63#define _CEI_TO_STATE(_cei_, _func_)	(_cei_)->states.__CONCAT(s_,_func_)
64
65#define _FUNCNAME(m)			__CONCAT(_citrus_DECHanyu_,m)
66#define _ENCODING_INFO			_DECHanyuEncodingInfo
67#define _ENCODING_STATE			_DECHanyuState
68#define _ENCODING_MB_CUR_MAX(_ei_)		4
69#define _ENCODING_IS_STATE_DEPENDENT		0
70#define _STATE_NEEDS_EXPLICIT_INIT(_ps_)	0
71
72static __inline void
73/*ARGSUSED*/
74_citrus_DECHanyu_init_state(_DECHanyuEncodingInfo * __restrict ei __unused,
75    _DECHanyuState * __restrict psenc)
76{
77
78	psenc->chlen = 0;
79}
80
81#if 0
82static __inline void
83/*ARGSUSED*/
84_citrus_DECHanyu_pack_state(_DECHanyuEncodingInfo * __restrict ei __unused,
85    void * __restrict pspriv, const _DECHanyuState * __restrict psenc)
86{
87
88	memcpy(pspriv, (const void *)psenc, sizeof(*psenc));
89}
90
91static __inline void
92/*ARGSUSED*/
93_citrus_DECHanyu_unpack_state(_DECHanyuEncodingInfo * __restrict ei __unused,
94    _DECHanyuState * __restrict psenc,
95    const void * __restrict pspriv)
96{
97
98	memcpy((void *)psenc, pspriv, sizeof(*psenc));
99}
100#endif
101
102static void
103/*ARGSUSED*/
104_citrus_DECHanyu_encoding_module_uninit(_DECHanyuEncodingInfo *ei __unused)
105{
106
107	/* ei may be null */
108}
109
110static int
111/*ARGSUSED*/
112_citrus_DECHanyu_encoding_module_init(_DECHanyuEncodingInfo * __restrict ei __unused,
113    const void * __restrict var __unused, size_t lenvar __unused)
114{
115
116	/* ei may be null */
117	return (0);
118}
119
120static __inline bool
121is_singlebyte(int c)
122{
123
124	return (c <= 0x7F);
125}
126
127static __inline bool
128is_leadbyte(int c)
129{
130
131	return (c >= 0xA1 && c <= 0xFE);
132}
133
134static __inline bool
135is_trailbyte(int c)
136{
137
138	c &= ~0x80;
139	return (c >= 0x21 && c <= 0x7E);
140}
141
142static __inline bool
143is_hanyu1(int c)
144{
145
146	return (c == 0xC2);
147}
148
149static __inline bool
150is_hanyu2(int c)
151{
152
153	return (c == 0xCB);
154}
155
156#define HANYUBIT	0xC2CB0000
157
158static __inline bool
159is_94charset(int c)
160{
161
162	return (c >= 0x21 && c <= 0x7E);
163}
164
165static int
166/*ARGSUSED*/
167_citrus_DECHanyu_mbrtowc_priv(_DECHanyuEncodingInfo * __restrict ei,
168    wchar_t * __restrict pwc, char ** __restrict s, size_t n,
169    _DECHanyuState * __restrict psenc, size_t * __restrict nresult)
170{
171	char *s0;
172	wchar_t wc;
173	int ch;
174
175	if (*s == NULL) {
176		_citrus_DECHanyu_init_state(ei, psenc);
177		*nresult = _ENCODING_IS_STATE_DEPENDENT;
178		return (0);
179	}
180	s0 = *s;
181
182	wc = (wchar_t)0;
183	switch (psenc->chlen) {
184	case 0:
185		if (n-- < 1)
186			goto restart;
187		ch = *s0++ & 0xFF;
188		if (is_singlebyte(ch)) {
189			if (pwc != NULL)
190				*pwc = (wchar_t)ch;
191			*nresult = (size_t)((ch == 0) ? 0 : 1);
192			*s = s0;
193			return (0);
194		}
195		if (!is_leadbyte(ch))
196			goto ilseq;
197		psenc->ch[psenc->chlen++] = ch;
198		break;
199	case 1:
200		ch = psenc->ch[0] & 0xFF;
201		if (!is_leadbyte(ch))
202			return (EINVAL);
203		break;
204	case 2: case 3:
205		ch = psenc->ch[0] & 0xFF;
206		if (is_hanyu1(ch)) {
207			ch = psenc->ch[1] & 0xFF;
208			if (is_hanyu2(ch)) {
209				wc |= (wchar_t)HANYUBIT;
210				break;
211			}
212		}
213	/*FALLTHROUGH*/
214	default:
215		return (EINVAL);
216	}
217
218	switch (psenc->chlen) {
219	case 1:
220		if (is_hanyu1(ch)) {
221			if (n-- < 1)
222				goto restart;
223			ch = *s0++ & 0xFF;
224			if (!is_hanyu2(ch))
225				goto ilseq;
226			psenc->ch[psenc->chlen++] = ch;
227			wc |= (wchar_t)HANYUBIT;
228			if (n-- < 1)
229				goto restart;
230			ch = *s0++ & 0xFF;
231			if (!is_leadbyte(ch))
232				goto ilseq;
233			psenc->ch[psenc->chlen++] = ch;
234		}
235		break;
236	case 2:
237		if (n-- < 1)
238			goto restart;
239		ch = *s0++ & 0xFF;
240		if (!is_leadbyte(ch))
241			goto ilseq;
242		psenc->ch[psenc->chlen++] = ch;
243		break;
244	case 3:
245		ch = psenc->ch[2] & 0xFF;
246		if (!is_leadbyte(ch))
247			return (EINVAL);
248	}
249	if (n-- < 1)
250		goto restart;
251	wc |= (wchar_t)(ch << 8);
252	ch = *s0++ & 0xFF;
253	if (!is_trailbyte(ch))
254		goto ilseq;
255	wc |= (wchar_t)ch;
256	if (pwc != NULL)
257		*pwc = wc;
258	*nresult = (size_t)(s0 - *s);
259	*s = s0;
260	psenc->chlen = 0;
261
262	return (0);
263
264restart:
265	*nresult = (size_t)-2;
266	*s = s0;
267	return (0);
268
269ilseq:
270	*nresult = (size_t)-1;
271	return (EILSEQ);
272}
273
274static int
275/*ARGSUSED*/
276_citrus_DECHanyu_wcrtomb_priv(_DECHanyuEncodingInfo * __restrict ei __unused,
277    char * __restrict s, size_t n, wchar_t wc,
278    _DECHanyuState * __restrict psenc, size_t * __restrict nresult)
279{
280	int ch;
281
282	if (psenc->chlen != 0)
283		return (EINVAL);
284
285	/* XXX: assume wchar_t as int */
286	if ((uint32_t)wc <= 0x7F) {
287		ch = wc & 0xFF;
288	} else {
289		if ((uint32_t)wc > 0xFFFF) {
290			if ((wc & ~0xFFFF) != (wchar_t)HANYUBIT)
291				goto ilseq;
292			psenc->ch[psenc->chlen++] = (wc >> 24) & 0xFF;
293			psenc->ch[psenc->chlen++] = (wc >> 16) & 0xFF;
294			wc &= 0xFFFF;
295		}
296		ch = (wc >> 8) & 0xFF;
297		if (!is_leadbyte(ch))
298			goto ilseq;
299		psenc->ch[psenc->chlen++] = ch;
300		ch = wc & 0xFF;
301		if (!is_trailbyte(ch))
302			goto ilseq;
303	}
304	psenc->ch[psenc->chlen++] = ch;
305	if (n < psenc->chlen) {
306		*nresult = (size_t)-1;
307		return (E2BIG);
308	}
309	memcpy(s, psenc->ch, psenc->chlen);
310	*nresult = psenc->chlen;
311	psenc->chlen = 0;
312
313	return (0);
314
315ilseq:
316	*nresult = (size_t)-1;
317	return (EILSEQ);
318}
319
320static __inline int
321/*ARGSUSED*/
322_citrus_DECHanyu_stdenc_wctocs(_DECHanyuEncodingInfo * __restrict ei __unused,
323    _csid_t * __restrict csid, _index_t * __restrict idx, wchar_t wc)
324{
325	wchar_t mask;
326	int plane;
327
328	plane = 0;
329	mask = 0x7F;
330	/* XXX: assume wchar_t as int */
331	if ((uint32_t)wc > 0x7F) {
332		if ((uint32_t)wc > 0xFFFF) {
333			if ((wc & ~0xFFFF) != (wchar_t)HANYUBIT)
334				return (EILSEQ);
335			plane += 2;
336		}
337		if (!is_leadbyte((wc >> 8) & 0xFF) ||
338		    !is_trailbyte(wc & 0xFF))
339			return (EILSEQ);
340		plane += (wc & 0x80) ? 1 : 2;
341		mask |= 0x7F00;
342	}
343	*csid = plane;
344	*idx = (_index_t)(wc & mask);
345
346	return (0);
347}
348
349static __inline int
350/*ARGSUSED*/
351_citrus_DECHanyu_stdenc_cstowc(_DECHanyuEncodingInfo * __restrict ei __unused,
352    wchar_t * __restrict wc, _csid_t csid, _index_t idx)
353{
354
355	if (csid == 0) {
356		if (idx > 0x7F)
357			return (EILSEQ);
358	} else if (csid <= 4) {
359		if (!is_94charset(idx >> 8))
360			return (EILSEQ);
361		if (!is_94charset(idx & 0xFF))
362			return (EILSEQ);
363		if (csid % 2)
364			idx |= 0x80;
365		idx |= 0x8000;
366		if (csid > 2)
367			idx |= HANYUBIT;
368	} else
369		return (EILSEQ);
370	*wc = (wchar_t)idx;
371	return (0);
372}
373
374static __inline int
375/*ARGSUSED*/
376_citrus_DECHanyu_stdenc_get_state_desc_generic(
377    _DECHanyuEncodingInfo * __restrict ei __unused,
378    _DECHanyuState * __restrict psenc, int * __restrict rstate)
379{
380
381	*rstate = (psenc->chlen == 0)
382	    ? _STDENC_SDGEN_INITIAL
383	    : _STDENC_SDGEN_INCOMPLETE_CHAR;
384	return (0);
385}
386
387/* ----------------------------------------------------------------------
388 * public interface for stdenc
389 */
390
391_CITRUS_STDENC_DECLS(DECHanyu);
392_CITRUS_STDENC_DEF_OPS(DECHanyu);
393
394#include "citrus_stdenc_template.h"
395