1/* $FreeBSD$ */
2/* $NetBSD: citrus_johab.c,v 1.4 2008/06/14 16:01:07 tnozaki Exp $ */
3
4/*-
5 * Copyright (c)2006 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 <stdbool.h>
36#include <stddef.h>
37#include <stdint.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <wchar.h>
42
43#include "citrus_namespace.h"
44#include "citrus_types.h"
45#include "citrus_bcs.h"
46#include "citrus_module.h"
47#include "citrus_stdenc.h"
48#include "citrus_johab.h"
49
50/* ----------------------------------------------------------------------
51 * private stuffs used by templates
52 */
53
54typedef struct {
55	int	 chlen;
56	char	 ch[2];
57} _JOHABState;
58
59typedef struct {
60	int	 dummy;
61} _JOHABEncodingInfo;
62
63#define _CEI_TO_EI(_cei_)		(&(_cei_)->ei)
64#define _CEI_TO_STATE(_cei_, _func_)	(_cei_)->states.s_##_func_
65
66#define _FUNCNAME(m)			_citrus_JOHAB_##m
67#define _ENCODING_INFO			_JOHABEncodingInfo
68#define _ENCODING_STATE			_JOHABState
69#define _ENCODING_MB_CUR_MAX(_ei_)		2
70#define _ENCODING_IS_STATE_DEPENDENT		0
71#define _STATE_NEEDS_EXPLICIT_INIT(_ps_)	0
72
73
74static __inline void
75/*ARGSUSED*/
76_citrus_JOHAB_init_state(_JOHABEncodingInfo * __restrict ei __unused,
77    _JOHABState * __restrict psenc)
78{
79
80	psenc->chlen = 0;
81}
82
83static __inline void
84/*ARGSUSED*/
85_citrus_JOHAB_pack_state(_JOHABEncodingInfo * __restrict ei __unused,
86    void * __restrict pspriv, const _JOHABState * __restrict psenc)
87{
88
89	memcpy(pspriv, (const void *)psenc, sizeof(*psenc));
90}
91
92static __inline void
93/*ARGSUSED*/
94_citrus_JOHAB_unpack_state(_JOHABEncodingInfo * __restrict ei __unused,
95    _JOHABState * __restrict psenc, const void * __restrict pspriv)
96{
97
98	memcpy((void *)psenc, pspriv, sizeof(*psenc));
99}
100
101static void
102/*ARGSUSED*/
103_citrus_JOHAB_encoding_module_uninit(_JOHABEncodingInfo *ei __unused)
104{
105
106	/* ei may be null */
107}
108
109static int
110/*ARGSUSED*/
111_citrus_JOHAB_encoding_module_init(_JOHABEncodingInfo * __restrict ei __unused,
112    const void * __restrict var __unused, size_t lenvar __unused)
113{
114
115	/* ei may be null */
116	return (0);
117}
118
119static __inline bool
120ishangul(int l, int t)
121{
122
123	return ((l >= 0x84 && l <= 0xD3) &&
124	    ((t >= 0x41 && t <= 0x7E) || (t >= 0x81 && t <= 0xFE)));
125}
126
127static __inline bool
128isuda(int l, int t)
129{
130
131	return ((l == 0xD8) &&
132	    ((t >= 0x31 && t <= 0x7E) || (t >= 0x91 && t <= 0xFE)));
133}
134
135static __inline bool
136ishanja(int l, int t)
137{
138
139	return (((l >= 0xD9 && l <= 0xDE) || (l >= 0xE0 && l <= 0xF9)) &&
140	    ((t >= 0x31 && t <= 0x7E) || (t >= 0x91 && t <= 0xFE)));
141}
142
143static int
144/*ARGSUSED*/
145_citrus_JOHAB_mbrtowc_priv(_JOHABEncodingInfo * __restrict ei,
146    wchar_t * __restrict pwc, const char ** __restrict s, size_t n,
147    _JOHABState * __restrict psenc, size_t * __restrict nresult)
148{
149	const char *s0;
150	int l, t;
151
152	if (*s == NULL) {
153		_citrus_JOHAB_init_state(ei, psenc);
154		*nresult = _ENCODING_IS_STATE_DEPENDENT;
155		return (0);
156	}
157	s0 = *s;
158
159	switch (psenc->chlen) {
160	case 0:
161		if (n-- < 1)
162			goto restart;
163		l = *s0++ & 0xFF;
164		if (l <= 0x7F) {
165			if (pwc != NULL)
166				*pwc = (wchar_t)l;
167			*nresult = (l == 0) ? 0 : 1;
168			*s = s0;
169			return (0);
170		}
171		psenc->ch[psenc->chlen++] = l;
172		break;
173	case 1:
174		l = psenc->ch[0] & 0xFF;
175		break;
176	default:
177		return (EINVAL);
178	}
179	if (n-- < 1) {
180restart:
181		*nresult = (size_t)-2;
182		*s = s0;
183		return (0);
184	}
185	t = *s0++ & 0xFF;
186	if (!ishangul(l, t) && !isuda(l, t) && !ishanja(l, t)) {
187		*nresult = (size_t)-1;
188		return (EILSEQ);
189	}
190	if (pwc != NULL)
191		*pwc = (wchar_t)(l << 8 | t);
192	*nresult = s0 - *s;
193	*s = s0;
194	psenc->chlen = 0;
195
196	return (0);
197}
198
199static int
200/*ARGSUSED*/
201_citrus_JOHAB_wcrtomb_priv(_JOHABEncodingInfo * __restrict ei __unused,
202    char * __restrict s, size_t n, wchar_t wc,
203    _JOHABState * __restrict psenc, size_t * __restrict nresult)
204{
205	int l, t;
206
207	if (psenc->chlen != 0)
208		return (EINVAL);
209
210	/* XXX assume wchar_t as int */
211	if ((uint32_t)wc <= 0x7F) {
212		if (n < 1)
213			goto e2big;
214		*s = wc & 0xFF;
215		*nresult = 1;
216	} else if ((uint32_t)wc <= 0xFFFF) {
217		if (n < 2) {
218e2big:
219			*nresult = (size_t)-1;
220			return (E2BIG);
221		}
222		l = (wc >> 8) & 0xFF;
223		t = wc & 0xFF;
224		if (!ishangul(l, t) && !isuda(l, t) && !ishanja(l, t))
225			goto ilseq;
226		*s++ = l;
227		*s = t;
228		*nresult = 2;
229	} else {
230ilseq:
231		*nresult = (size_t)-1;
232		return (EILSEQ);
233	}
234	return (0);
235
236}
237
238static __inline int
239/*ARGSUSED*/
240_citrus_JOHAB_stdenc_wctocs(_JOHABEncodingInfo * __restrict ei __unused,
241    _csid_t * __restrict csid, _index_t * __restrict idx, wchar_t wc)
242{
243	int m, l, linear, t;
244
245	/* XXX assume wchar_t as int */
246	if ((uint32_t)wc <= 0x7F) {
247		*idx = (_index_t)wc;
248		*csid = 0;
249	} else if ((uint32_t)wc <= 0xFFFF) {
250		l = (wc >> 8) & 0xFF;
251		t = wc & 0xFF;
252		if (ishangul(l, t) || isuda(l, t)) {
253			*idx = (_index_t)wc;
254			*csid = 1;
255		} else {
256			if (l >= 0xD9 && l <= 0xDE) {
257				linear = l - 0xD9;
258				m = 0x21;
259			} else if (l >= 0xE0 && l <= 0xF9) {
260				linear = l - 0xE0;
261				m = 0x4A;
262			} else
263				return (EILSEQ);
264			linear *= 188;
265			if (t >= 0x31 && t <= 0x7E)
266				linear += t - 0x31;
267			else if (t >= 0x91 && t <= 0xFE)
268				linear += t - 0x43;
269			else
270				return (EILSEQ);
271			l = (linear / 94) + m;
272			t = (linear % 94) + 0x21;
273			*idx = (_index_t)((l << 8) | t);
274			*csid = 2;
275		}
276	} else
277		return (EILSEQ);
278	return (0);
279}
280
281static __inline int
282/*ARGSUSED*/
283_citrus_JOHAB_stdenc_cstowc(_JOHABEncodingInfo * __restrict ei __unused,
284    wchar_t * __restrict wc, _csid_t csid, _index_t idx)
285{
286	int m, n, l, linear, t;
287
288	switch (csid) {
289	case 0:
290	case 1:
291		*wc = (wchar_t)idx;
292		break;
293	case 2:
294		if (idx >= 0x2121 && idx <= 0x2C71) {
295			m = 0xD9;
296			n = 0x21;
297		} else if (idx >= 0x4A21 && idx <= 0x7D7E) {
298			m = 0xE0;
299			n = 0x4A;
300		} else
301			return (EILSEQ);
302		l = ((idx >> 8) & 0xFF) - n;
303		t = (idx & 0xFF) - 0x21;
304		linear = (l * 94) + t;
305		l = (linear / 188) + m;
306		t = linear % 188;
307		t += (t <= 0x4D) ? 0x31 : 0x43;
308		break;
309	default:
310		return (EILSEQ);
311	}
312	return (0);
313}
314
315static __inline int
316/*ARGSUSED*/
317_citrus_JOHAB_stdenc_get_state_desc_generic(_JOHABEncodingInfo * __restrict ei __unused,
318    _JOHABState * __restrict psenc, int * __restrict rstate)
319{
320
321	*rstate = (psenc->chlen == 0) ? _STDENC_SDGEN_INITIAL :
322	    _STDENC_SDGEN_INCOMPLETE_CHAR;
323	return (0);
324}
325
326/* ----------------------------------------------------------------------
327 * public interface for stdenc
328 */
329
330_CITRUS_STDENC_DECLS(JOHAB);
331_CITRUS_STDENC_DEF_OPS(JOHAB);
332
333#include "citrus_stdenc_template.h"
334