citrus_euc.c revision 282275 
1/* $FreeBSD: stable/10/lib/libiconv_modules/EUC/citrus_euc.c 282275 2015-04-30 16:08:47Z tijl $ */
2/*	$NetBSD: citrus_euc.c,v 1.14 2009/01/11 02:46:24 christos Exp $	*/
3
4/*-
5 * Copyright (c)2002 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
30/*-
31 * Copyright (c) 1993
32 *	The Regents of the University of California.  All rights reserved.
33 *
34 * This code is derived from software contributed to Berkeley by
35 * Paul Borman at Krystal Technologies.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 *    notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 *    notice, this list of conditions and the following disclaimer in the
44 *    documentation and/or other materials provided with the distribution.
45 * 3. Neither the name of the University nor the names of its contributors
46 *    may be used to endorse or promote products derived from this software
47 *    without specific prior written permission.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 * SUCH DAMAGE.
60 */
61
62#include <sys/cdefs.h>
63#include <sys/types.h>
64
65#include <assert.h>
66#include <errno.h>
67#include <limits.h>
68#include <stddef.h>
69#include <stdio.h>
70#include <stdlib.h>
71#include <string.h>
72#include <wchar.h>
73
74#include "citrus_namespace.h"
75#include "citrus_bcs.h"
76#include "citrus_types.h"
77#include "citrus_module.h"
78#include "citrus_stdenc.h"
79#include "citrus_euc.h"
80
81
82/* ----------------------------------------------------------------------
83 * private stuffs used by templates
84 */
85
86typedef struct {
87	int	 chlen;
88	char	 ch[3];
89} _EUCState;
90
91typedef struct {
92	wchar_t		 bits[4];
93	wchar_t		 mask;
94	unsigned	 count[4];
95	unsigned	 mb_cur_max;
96} _EUCEncodingInfo;
97
98#define	_SS2	0x008e
99#define	_SS3	0x008f
100
101#define _CEI_TO_EI(_cei_)		(&(_cei_)->ei)
102#define _CEI_TO_STATE(_cei_, _func_)	(_cei_)->states.s_##_func_
103
104#define _FUNCNAME(m)			_citrus_EUC_##m
105#define _ENCODING_INFO			_EUCEncodingInfo
106#define _ENCODING_STATE			_EUCState
107#define _ENCODING_MB_CUR_MAX(_ei_)	(_ei_)->mb_cur_max
108#define _ENCODING_IS_STATE_DEPENDENT	0
109#define _STATE_NEEDS_EXPLICIT_INIT(_ps_)	0
110
111
112static __inline int
113_citrus_EUC_cs(unsigned int c)
114{
115
116	c &= 0xff;
117
118	return ((c & 0x80) ? c == _SS3 ? 3 : c == _SS2 ? 2 : 1 : 0);
119}
120
121static __inline int
122_citrus_EUC_parse_variable(_EUCEncodingInfo *ei, const void *var,
123    size_t lenvar __unused)
124{
125	char *e;
126	const char *v;
127	int x;
128
129	/* parse variable string */
130	if (!var)
131		return (EFTYPE);
132
133	v = (const char *)var;
134
135	while (*v == ' ' || *v == '\t')
136		++v;
137
138	ei->mb_cur_max = 1;
139	for (x = 0; x < 4; ++x) {
140		ei->count[x] = (int)_bcs_strtol(v, (char **)&e, 0);
141		if (v == e || !(v = e) || ei->count[x] < 1 || ei->count[x] > 4) {
142			return (EFTYPE);
143		}
144		if (ei->mb_cur_max < ei->count[x])
145			ei->mb_cur_max = ei->count[x];
146		while (*v == ' ' || *v == '\t')
147			++v;
148		ei->bits[x] = (int)_bcs_strtol(v, (char **)&e, 0);
149		if (v == e || !(v = e)) {
150			return (EFTYPE);
151		}
152		while (*v == ' ' || *v == '\t')
153			++v;
154	}
155	ei->mask = (int)_bcs_strtol(v, (char **)&e, 0);
156	if (v == e || !(v = e)) {
157		return (EFTYPE);
158	}
159
160	return (0);
161}
162
163
164static __inline void
165/*ARGSUSED*/
166_citrus_EUC_init_state(_EUCEncodingInfo *ei __unused, _EUCState *s)
167{
168
169	memset(s, 0, sizeof(*s));
170}
171
172#if 0
173static __inline void
174/*ARGSUSED*/
175_citrus_EUC_pack_state(_EUCEncodingInfo *ei __unused, void *pspriv,
176    const _EUCState *s)
177{
178
179	memcpy(pspriv, (const void *)s, sizeof(*s));
180}
181
182static __inline void
183/*ARGSUSED*/
184_citrus_EUC_unpack_state(_EUCEncodingInfo *ei __unused, _EUCState *s,
185    const void *pspriv)
186{
187
188	memcpy((void *)s, pspriv, sizeof(*s));
189}
190#endif
191
192static int
193_citrus_EUC_mbrtowc_priv(_EUCEncodingInfo *ei, wchar_t *pwc, char **s,
194    size_t n, _EUCState *psenc, size_t *nresult)
195{
196	wchar_t wchar;
197	int c, chlenbak, cs, len;
198	char *s0, *s1 = NULL;
199
200	s0 = *s;
201
202	if (s0 == NULL) {
203		_citrus_EUC_init_state(ei, psenc);
204		*nresult = 0; /* state independent */
205		return (0);
206	}
207
208	chlenbak = psenc->chlen;
209
210	/* make sure we have the first byte in the buffer */
211	switch (psenc->chlen) {
212	case 0:
213		if (n < 1)
214			goto restart;
215		psenc->ch[0] = *s0++;
216		psenc->chlen = 1;
217		n--;
218		break;
219	case 1:
220	case 2:
221		break;
222	default:
223		/* illgeal state */
224		goto encoding_error;
225	}
226
227	c = ei->count[cs = _citrus_EUC_cs(psenc->ch[0] & 0xff)];
228	if (c == 0)
229		goto encoding_error;
230	while (psenc->chlen < c) {
231		if (n < 1)
232			goto restart;
233		psenc->ch[psenc->chlen] = *s0++;
234		psenc->chlen++;
235		n--;
236	}
237	*s = s0;
238
239	switch (cs) {
240	case 3:
241	case 2:
242		/* skip SS2/SS3 */
243		len = c - 1;
244		s1 = &psenc->ch[1];
245		break;
246	case 1:
247	case 0:
248		len = c;
249		s1 = &psenc->ch[0];
250		break;
251	default:
252		goto encoding_error;
253	}
254	wchar = 0;
255	while (len-- > 0)
256		wchar = (wchar << 8) | (*s1++ & 0xff);
257	wchar = (wchar & ~ei->mask) | ei->bits[cs];
258
259	psenc->chlen = 0;
260	if (pwc)
261		*pwc = wchar;
262	*nresult = wchar ? (size_t)(c - chlenbak) : 0;
263	return (0);
264
265encoding_error:
266	psenc->chlen = 0;
267	*nresult = (size_t)-1;
268	return (EILSEQ);
269
270restart:
271	*nresult = (size_t)-2;
272	*s = s0;
273	return (0);
274}
275
276static int
277_citrus_EUC_wcrtomb_priv(_EUCEncodingInfo *ei, char *s, size_t n, wchar_t wc,
278    _EUCState *psenc __unused, size_t *nresult)
279{
280	wchar_t m, nm;
281	unsigned int cs;
282	int ret;
283	short i;
284
285	m = wc & ei->mask;
286	nm = wc & ~m;
287
288	for (cs = 0; cs < sizeof(ei->count) / sizeof(ei->count[0]); cs++)
289		if (m == ei->bits[cs])
290			break;
291	/* fallback case - not sure if it is necessary */
292	if (cs == sizeof(ei->count) / sizeof(ei->count[0]))
293		cs = 1;
294
295	i = ei->count[cs];
296	if (n < (unsigned)i) {
297		ret = E2BIG;
298		goto err;
299	}
300	m = (cs) ? 0x80 : 0x00;
301	switch (cs) {
302	case 2:
303		*s++ = _SS2;
304		i--;
305		break;
306	case 3:
307		*s++ = _SS3;
308		i--;
309		break;
310	}
311
312	while (i-- > 0)
313		*s++ = ((nm >> (i << 3)) & 0xff) | m;
314
315	*nresult = (size_t)ei->count[cs];
316	return (0);
317
318err:
319	*nresult = (size_t)-1;
320	return (ret);
321}
322
323static __inline int
324/*ARGSUSED*/
325_citrus_EUC_stdenc_wctocs(_EUCEncodingInfo * __restrict ei,
326    _csid_t * __restrict csid, _index_t * __restrict idx, wchar_t wc)
327{
328	wchar_t m, nm;
329
330	m = wc & ei->mask;
331	nm = wc & ~m;
332
333	*csid = (_citrus_csid_t)m;
334	*idx  = (_citrus_index_t)nm;
335
336	return (0);
337}
338
339static __inline int
340/*ARGSUSED*/
341_citrus_EUC_stdenc_cstowc(_EUCEncodingInfo * __restrict ei,
342    wchar_t * __restrict wc, _csid_t csid, _index_t idx)
343{
344
345	if ((csid & ~ei->mask) != 0 || (idx & ei->mask) != 0)
346		return (EINVAL);
347
348	*wc = (wchar_t)csid | (wchar_t)idx;
349
350	return (0);
351}
352
353static __inline int
354/*ARGSUSED*/
355_citrus_EUC_stdenc_get_state_desc_generic(_EUCEncodingInfo * __restrict ei __unused,
356    _EUCState * __restrict psenc, int * __restrict rstate)
357{
358
359	*rstate = (psenc->chlen == 0) ? _STDENC_SDGEN_INITIAL :
360	    _STDENC_SDGEN_INCOMPLETE_CHAR;
361	return (0);
362}
363
364static int
365/*ARGSUSED*/
366_citrus_EUC_encoding_module_init(_EUCEncodingInfo * __restrict ei,
367    const void * __restrict var, size_t lenvar)
368{
369
370	return (_citrus_EUC_parse_variable(ei, var, lenvar));
371}
372
373static void
374/*ARGSUSED*/
375_citrus_EUC_encoding_module_uninit(_EUCEncodingInfo * __restrict ei __unused)
376{
377
378}
379
380/* ----------------------------------------------------------------------
381 * public interface for stdenc
382 */
383
384_CITRUS_STDENC_DECLS(EUC);
385_CITRUS_STDENC_DEF_OPS(EUC);
386
387#include "citrus_stdenc_template.h"
388