1/* $FreeBSD$ */
2/* $NetBSD: citrus_zw.c,v 1.4 2008/06/14 16:01:08 tnozaki Exp $ */
3
4/*-
5 * SPDX-License-Identifier: BSD-2-Clause
6 *
7 * Copyright (c)2004, 2006 Citrus Project,
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 */
32
33#include <sys/cdefs.h>
34#include <sys/types.h>
35
36#include <assert.h>
37#include <errno.h>
38#include <limits.h>
39#include <stddef.h>
40#include <stdio.h>
41#include <stdint.h>
42#include <stdlib.h>
43#include <string.h>
44#include <wchar.h>
45
46#include "citrus_namespace.h"
47#include "citrus_types.h"
48#include "citrus_module.h"
49#include "citrus_stdenc.h"
50#include "citrus_zw.h"
51
52/* ----------------------------------------------------------------------
53 * private stuffs used by templates
54 */
55
56typedef struct {
57	int	 dummy;
58} _ZWEncodingInfo;
59
60typedef enum {
61	NONE, AMBIGIOUS, ASCII, GB2312
62} _ZWCharset;
63
64typedef struct {
65	_ZWCharset	 charset;
66	int		 chlen;
67	char		 ch[4];
68} _ZWState;
69
70#define _CEI_TO_EI(_cei_)		(&(_cei_)->ei)
71#define _CEI_TO_STATE(_cei_, _func_)	(_cei_)->states.s_##_func_
72
73#define _FUNCNAME(m)			_citrus_ZW_##m
74#define _ENCODING_INFO			_ZWEncodingInfo
75#define _ENCODING_STATE			_ZWState
76#define _ENCODING_MB_CUR_MAX(_ei_)	MB_LEN_MAX
77#define _ENCODING_IS_STATE_DEPENDENT		1
78#define _STATE_NEEDS_EXPLICIT_INIT(_ps_)	((_ps_)->charset != NONE)
79
80static __inline void
81/*ARGSUSED*/
82_citrus_ZW_init_state(_ZWEncodingInfo * __restrict ei __unused,
83    _ZWState * __restrict psenc)
84{
85
86	psenc->chlen = 0;
87	psenc->charset = NONE;
88}
89
90#if 0
91static __inline void
92/*ARGSUSED*/
93_citrus_ZW_pack_state(_ZWEncodingInfo * __restrict ei __unused,
94    void *__restrict pspriv, const _ZWState * __restrict psenc)
95{
96
97	memcpy(pspriv, (const void *)psenc, sizeof(*psenc));
98}
99
100static __inline void
101/*ARGSUSED*/
102_citrus_ZW_unpack_state(_ZWEncodingInfo * __restrict ei __unused,
103    _ZWState * __restrict psenc, const void * __restrict pspriv)
104{
105
106	memcpy((void *)psenc, pspriv, sizeof(*psenc));
107}
108#endif
109
110static int
111_citrus_ZW_mbrtowc_priv(_ZWEncodingInfo * __restrict ei,
112    wchar_t * __restrict pwc, char **__restrict s, size_t n,
113    _ZWState * __restrict psenc, size_t * __restrict nresult)
114{
115	char *s0;
116	wchar_t  wc;
117	int ch, len;
118
119	if (*s == NULL) {
120		_citrus_ZW_init_state(ei, psenc);
121		*nresult = (size_t)_ENCODING_IS_STATE_DEPENDENT;
122		return (0);
123	}
124	s0 = *s;
125	len = 0;
126
127#define	STORE				\
128do {					\
129	if (n-- < 1) {			\
130		*nresult = (size_t)-2;	\
131		*s = s0;		\
132		return (0);		\
133	}				\
134	ch = (unsigned char)*s0++;	\
135	if (len++ > MB_LEN_MAX || ch > 0x7F)\
136		goto ilseq;		\
137	psenc->ch[psenc->chlen++] = ch;	\
138} while (/*CONSTCOND*/0)
139
140loop:
141	switch (psenc->charset) {
142	case ASCII:
143		switch (psenc->chlen) {
144		case 0:
145			STORE;
146			switch (psenc->ch[0]) {
147			case '\0': case '\n':
148				psenc->charset = NONE;
149			}
150		/*FALLTHROUGH*/
151		case 1:
152			break;
153		default:
154			return (EINVAL);
155		}
156		ch = (unsigned char)psenc->ch[0];
157		if (ch > 0x7F)
158			goto ilseq;
159		wc = (wchar_t)ch;
160		psenc->chlen = 0;
161		break;
162	case NONE:
163		if (psenc->chlen != 0)
164			return (EINVAL);
165		STORE;
166		ch = (unsigned char)psenc->ch[0];
167		if (ch != 'z') {
168			if (ch != '\n' && ch != '\0')
169				psenc->charset = ASCII;
170			wc = (wchar_t)ch;
171			psenc->chlen = 0;
172			break;
173		}
174		psenc->charset = AMBIGIOUS;
175		psenc->chlen = 0;
176	/* FALLTHROUGH */
177	case AMBIGIOUS:
178		if (psenc->chlen != 0)
179			return (EINVAL);
180		STORE;
181		if (psenc->ch[0] != 'W') {
182			psenc->charset = ASCII;
183			wc = L'z';
184			break;
185		}
186		psenc->charset = GB2312;
187		psenc->chlen = 0;
188	/* FALLTHROUGH */
189	case GB2312:
190		switch (psenc->chlen) {
191		case 0:
192			STORE;
193			ch = (unsigned char)psenc->ch[0];
194			if (ch == '\0') {
195				psenc->charset = NONE;
196				wc = (wchar_t)ch;
197				psenc->chlen = 0;
198				break;
199			} else if (ch == '\n') {
200				psenc->charset = NONE;
201				psenc->chlen = 0;
202				goto loop;
203			}
204		/*FALLTHROUGH*/
205		case 1:
206			STORE;
207			if (psenc->ch[0] == ' ') {
208				ch = (unsigned char)psenc->ch[1];
209				wc = (wchar_t)ch;
210				psenc->chlen = 0;
211				break;
212			} else if (psenc->ch[0] == '#') {
213				ch = (unsigned char)psenc->ch[1];
214				if (ch == '\n') {
215					psenc->charset = NONE;
216					wc = (wchar_t)ch;
217					psenc->chlen = 0;
218					break;
219				} else if (ch == ' ') {
220					wc = (wchar_t)ch;
221					psenc->chlen = 0;
222					break;
223				}
224			}
225			ch = (unsigned char)psenc->ch[0];
226			if (ch < 0x21 || ch > 0x7E)
227				goto ilseq;
228			wc = (wchar_t)(ch << 8);
229			ch = (unsigned char)psenc->ch[1];
230			if (ch < 0x21 || ch > 0x7E) {
231ilseq:
232				*nresult = (size_t)-1;
233				return (EILSEQ);
234			}
235			wc |= (wchar_t)ch;
236			psenc->chlen = 0;
237			break;
238		default:
239			return (EINVAL);
240		}
241		break;
242	default:
243		return (EINVAL);
244	}
245	if (pwc != NULL)
246		*pwc = wc;
247
248	*nresult = (size_t)(wc == 0 ? 0 : len);
249	*s = s0;
250
251	return (0);
252}
253
254static int
255/*ARGSUSED*/
256_citrus_ZW_wcrtomb_priv(_ZWEncodingInfo * __restrict ei __unused,
257    char *__restrict s, size_t n, wchar_t wc,
258    _ZWState * __restrict psenc, size_t * __restrict nresult)
259{
260	int ch;
261
262	if (psenc->chlen != 0)
263		return (EINVAL);
264	if ((uint32_t)wc <= 0x7F) {
265		ch = (unsigned char)wc;
266		switch (psenc->charset) {
267		case NONE:
268			if (ch == '\0' || ch == '\n')
269				psenc->ch[psenc->chlen++] = ch;
270			else {
271				if (n < 4)
272					return (E2BIG);
273				n -= 4;
274				psenc->ch[psenc->chlen++] = 'z';
275				psenc->ch[psenc->chlen++] = 'W';
276				psenc->ch[psenc->chlen++] = ' ';
277				psenc->ch[psenc->chlen++] = ch;
278				psenc->charset = GB2312;
279			}
280			break;
281		case GB2312:
282			if (n < 2)
283				return (E2BIG);
284			n -= 2;
285			if (ch == '\0') {
286				psenc->ch[psenc->chlen++] = '\n';
287				psenc->ch[psenc->chlen++] = '\0';
288				psenc->charset = NONE;
289			} else if (ch == '\n') {
290				psenc->ch[psenc->chlen++] = '#';
291				psenc->ch[psenc->chlen++] = '\n';
292				psenc->charset = NONE;
293			} else {
294				psenc->ch[psenc->chlen++] = ' ';
295				psenc->ch[psenc->chlen++] = ch;
296			}
297			break;
298		default:
299			return (EINVAL);
300		}
301	} else if ((uint32_t)wc <= 0x7E7E) {
302		switch (psenc->charset) {
303		case NONE:
304			if (n < 2)
305				return (E2BIG);
306			n -= 2;
307			psenc->ch[psenc->chlen++] = 'z';
308			psenc->ch[psenc->chlen++] = 'W';
309			psenc->charset = GB2312;
310		/* FALLTHROUGH*/
311		case GB2312:
312			if (n < 2)
313				return (E2BIG);
314			n -= 2;
315			ch = (wc >> 8) & 0xFF;
316			if (ch < 0x21 || ch > 0x7E)
317				goto ilseq;
318			psenc->ch[psenc->chlen++] = ch;
319			ch = wc & 0xFF;
320			if (ch < 0x21 || ch > 0x7E)
321				goto ilseq;
322			psenc->ch[psenc->chlen++] = ch;
323			break;
324		default:
325			return (EINVAL);
326		}
327	} else {
328ilseq:
329		*nresult = (size_t)-1;
330		return (EILSEQ);
331	}
332	memcpy(s, psenc->ch, psenc->chlen);
333	*nresult = psenc->chlen;
334	psenc->chlen = 0;
335
336	return (0);
337}
338
339static int
340/*ARGSUSED*/
341_citrus_ZW_put_state_reset(_ZWEncodingInfo * __restrict ei __unused,
342    char * __restrict s, size_t n, _ZWState * __restrict psenc,
343    size_t * __restrict nresult)
344{
345
346	if (psenc->chlen != 0)
347		return (EINVAL);
348	switch (psenc->charset) {
349	case GB2312:
350		if (n-- < 1)
351			return (E2BIG);
352		psenc->ch[psenc->chlen++] = '\n';
353		psenc->charset = NONE;
354	/*FALLTHROUGH*/
355	case NONE:
356		*nresult = psenc->chlen;
357		if (psenc->chlen > 0) {
358			memcpy(s, psenc->ch, psenc->chlen);
359			psenc->chlen = 0;
360		}
361		break;
362	default:
363		return (EINVAL);
364	}
365
366	return (0);
367}
368
369static __inline int
370/*ARGSUSED*/
371_citrus_ZW_stdenc_get_state_desc_generic(_ZWEncodingInfo * __restrict ei __unused,
372    _ZWState * __restrict psenc, int * __restrict rstate)
373{
374
375	switch (psenc->charset) {
376	case NONE:
377		if (psenc->chlen != 0)
378			return (EINVAL);
379		*rstate = _STDENC_SDGEN_INITIAL;
380		break;
381	case AMBIGIOUS:
382		if (psenc->chlen != 0)
383			return (EINVAL);
384		*rstate = _STDENC_SDGEN_INCOMPLETE_SHIFT;
385		break;
386	case ASCII:
387	case GB2312:
388		switch (psenc->chlen) {
389		case 0:
390			*rstate = _STDENC_SDGEN_STABLE;
391			break;
392		case 1:
393			*rstate = (psenc->ch[0] == '#') ?
394			    _STDENC_SDGEN_INCOMPLETE_SHIFT :
395			    _STDENC_SDGEN_INCOMPLETE_CHAR;
396			break;
397		default:
398			return (EINVAL);
399		}
400		break;
401	default:
402		return (EINVAL);
403	}
404	return (0);
405}
406
407static __inline int
408/*ARGSUSED*/
409_citrus_ZW_stdenc_wctocs(_ZWEncodingInfo * __restrict ei __unused,
410    _csid_t * __restrict csid, _index_t * __restrict idx, wchar_t wc)
411{
412
413	*csid = (_csid_t)(wc <= (wchar_t)0x7FU) ? 0 : 1;
414	*idx = (_index_t)wc;
415
416	return (0);
417}
418
419static __inline int
420/*ARGSUSED*/
421_citrus_ZW_stdenc_cstowc(_ZWEncodingInfo * __restrict ei __unused,
422    wchar_t * __restrict wc, _csid_t csid, _index_t idx)
423{
424
425	switch (csid) {
426	case 0: case 1:
427		break;
428	default:
429		return (EINVAL);
430	}
431	*wc = (wchar_t)idx;
432
433	return (0);
434}
435
436static void
437/*ARGSUSED*/
438_citrus_ZW_encoding_module_uninit(_ZWEncodingInfo *ei __unused)
439{
440
441}
442
443static int
444/*ARGSUSED*/
445_citrus_ZW_encoding_module_init(_ZWEncodingInfo * __restrict ei __unused,
446    const void *__restrict var __unused, size_t lenvar __unused)
447{
448
449	return (0);
450}
451
452/* ----------------------------------------------------------------------
453 * public interface for stdenc
454 */
455
456_CITRUS_STDENC_DECLS(ZW);
457_CITRUS_STDENC_DEF_OPS(ZW);
458
459#include "citrus_stdenc_template.h"
460