citrus_ues.c revision 282275 
1/* $FreeBSD: stable/10/lib/libiconv_modules/UES/citrus_ues.c 282275 2015-04-30 16:08:47Z tijl $ */
2/* $NetBSD: citrus_ues.c,v 1.3 2012/02/12 13:51:29 wiz 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
30#include <sys/cdefs.h>
31
32#include <assert.h>
33#include <errno.h>
34#include <limits.h>
35#include <stdio.h>
36#include <stdint.h>
37#include <stdlib.h>
38#include <string.h>
39#include <wchar.h>
40
41#include "citrus_namespace.h"
42#include "citrus_types.h"
43#include "citrus_bcs.h"
44#include "citrus_module.h"
45#include "citrus_stdenc.h"
46#include "citrus_ues.h"
47
48typedef struct {
49	size_t	 mb_cur_max;
50	int	 mode;
51#define MODE_C99	1
52} _UESEncodingInfo;
53
54typedef struct {
55	int	 chlen;
56	char	 ch[12];
57} _UESState;
58
59#define _CEI_TO_EI(_cei_)               (&(_cei_)->ei)
60#define _CEI_TO_STATE(_cei_, _func_)    (_cei_)->states.s_##_func_
61
62#define _FUNCNAME(m)			_citrus_UES_##m
63#define _ENCODING_INFO			_UESEncodingInfo
64#define _ENCODING_STATE			_UESState
65#define _ENCODING_MB_CUR_MAX(_ei_)	(_ei_)->mb_cur_max
66#define _ENCODING_IS_STATE_DEPENDENT		0
67#define _STATE_NEEDS_EXPLICIT_INIT(_ps_)	0
68
69static __inline void
70/*ARGSUSED*/
71_citrus_UES_init_state(_UESEncodingInfo * __restrict ei __unused,
72    _UESState * __restrict psenc)
73{
74
75	psenc->chlen = 0;
76}
77
78#if 0
79static __inline void
80/*ARGSUSED*/
81_citrus_UES_pack_state(_UESEncodingInfo * __restrict ei __unused,
82    void *__restrict pspriv, const _UESState * __restrict psenc)
83{
84
85	memcpy(pspriv, (const void *)psenc, sizeof(*psenc));
86}
87
88static __inline void
89/*ARGSUSED*/
90_citrus_UES_unpack_state(_UESEncodingInfo * __restrict ei __unused,
91    _UESState * __restrict psenc, const void * __restrict pspriv)
92{
93
94	memcpy((void *)psenc, pspriv, sizeof(*psenc));
95}
96#endif
97
98static __inline int
99to_int(int ch)
100{
101
102	if (ch >= '0' && ch <= '9')
103		return (ch - '0');
104	else if (ch >= 'A' && ch <= 'F')
105		return ((ch - 'A') + 10);
106	else if (ch >= 'a' && ch <= 'f')
107		return ((ch - 'a') + 10);
108	return (-1);
109}
110
111#define ESCAPE		'\\'
112#define UCS2_ESC	'u'
113#define UCS4_ESC	'U'
114
115#define UCS2_BIT	16
116#define UCS4_BIT	32
117#define BMP_MAX		UINT32_C(0xFFFF)
118#define UCS2_MAX	UINT32_C(0x10FFFF)
119#define UCS4_MAX	UINT32_C(0x7FFFFFFF)
120
121static const char *xdig = "0123456789abcdef";
122
123static __inline int
124to_str(char *s, wchar_t wc, int bit)
125{
126	char *p;
127
128	p = s;
129	*p++ = ESCAPE;
130	switch (bit) {
131	case UCS2_BIT:
132		*p++ = UCS2_ESC;
133		break;
134	case UCS4_BIT:
135		*p++ = UCS4_ESC;
136		break;
137	default:
138		abort();
139	}
140	do {
141		*p++ = xdig[(wc >> (bit -= 4)) & 0xF];
142	} while (bit > 0);
143	return (p - s);
144}
145
146static __inline bool
147is_hi_surrogate(wchar_t wc)
148{
149
150	return (wc >= 0xD800 && wc <= 0xDBFF);
151}
152
153static __inline bool
154is_lo_surrogate(wchar_t wc)
155{
156
157	return (wc >= 0xDC00 && wc <= 0xDFFF);
158}
159
160static __inline wchar_t
161surrogate_to_ucs(wchar_t hi, wchar_t lo)
162{
163
164	hi -= 0xD800;
165	lo -= 0xDC00;
166	return ((hi << 10 | lo) + 0x10000);
167}
168
169static __inline void
170ucs_to_surrogate(wchar_t wc, wchar_t * __restrict hi, wchar_t * __restrict lo)
171{
172
173	wc -= 0x10000;
174	*hi = (wc >> 10) + 0xD800;
175	*lo = (wc & 0x3FF) + 0xDC00;
176}
177
178static __inline bool
179is_basic(wchar_t wc)
180{
181
182	return ((uint32_t)wc <= 0x9F && wc != 0x24 && wc != 0x40 &&
183	    wc != 0x60);
184}
185
186static int
187_citrus_UES_mbrtowc_priv(_UESEncodingInfo * __restrict ei,
188    wchar_t * __restrict pwc, char ** __restrict s, size_t n,
189    _UESState * __restrict psenc, size_t * __restrict nresult)
190{
191	char *s0;
192	int ch, head, num, tail;
193	wchar_t hi, wc;
194
195	if (*s == NULL) {
196		_citrus_UES_init_state(ei, psenc);
197		*nresult = 0;
198		return (0);
199	}
200	s0 = *s;
201
202	hi = (wchar_t)0;
203	tail = 0;
204
205surrogate:
206	wc = (wchar_t)0;
207	head = tail;
208	if (psenc->chlen == head) {
209		if (n-- < 1)
210			goto restart;
211		psenc->ch[psenc->chlen++] = *s0++;
212	}
213	ch = (unsigned char)psenc->ch[head++];
214	if (ch == ESCAPE) {
215		if (psenc->chlen == head) {
216			if (n-- < 1)
217				goto restart;
218			psenc->ch[psenc->chlen++] = *s0++;
219		}
220		switch (psenc->ch[head]) {
221		case UCS2_ESC:
222			tail += 6;
223			break;
224		case UCS4_ESC:
225			if (ei->mode & MODE_C99) {
226				tail = 10;
227				break;
228			}
229		/*FALLTHROUGH*/
230		default:
231			tail = 0;
232		}
233		++head;
234	}
235	for (; head < tail; ++head) {
236		if (psenc->chlen == head) {
237			if (n-- < 1) {
238restart:
239				*s = s0;
240				*nresult = (size_t)-2;
241				return (0);
242			}
243			psenc->ch[psenc->chlen++] = *s0++;
244		}
245		num = to_int((int)(unsigned char)psenc->ch[head]);
246		if (num < 0) {
247			tail = 0;
248			break;
249		}
250		wc = (wc << 4) | num;
251	}
252	head = 0;
253	switch (tail) {
254	case 0:
255		break;
256	case 6:
257		if (hi != (wchar_t)0)
258			break;
259		if ((ei->mode & MODE_C99) == 0) {
260			if (is_hi_surrogate(wc) != 0) {
261				hi = wc;
262				goto surrogate;
263			}
264			if ((uint32_t)wc <= 0x7F /* XXX */ ||
265			    is_lo_surrogate(wc) != 0)
266				break;
267			goto done;
268		}
269	/*FALLTHROUGH*/
270	case 10:
271		if (is_basic(wc) == 0 && (uint32_t)wc <= UCS4_MAX &&
272		    is_hi_surrogate(wc) == 0 && is_lo_surrogate(wc) == 0)
273			goto done;
274		*nresult = (size_t)-1;
275		return (EILSEQ);
276	case 12:
277		if (is_lo_surrogate(wc) == 0)
278			break;
279		wc = surrogate_to_ucs(hi, wc);
280		goto done;
281	}
282	ch = (unsigned char)psenc->ch[0];
283	head = psenc->chlen;
284	if (--head > 0)
285		memmove(&psenc->ch[0], &psenc->ch[1], head);
286	wc = (wchar_t)ch;
287done:
288	psenc->chlen = head;
289	if (pwc != NULL)
290		*pwc = wc;
291	*nresult = (size_t)((wc == 0) ? 0 : (s0 - *s));
292	*s = s0;
293
294	return (0);
295}
296
297static int
298_citrus_UES_wcrtomb_priv(_UESEncodingInfo * __restrict ei,
299    char * __restrict s, size_t n, wchar_t wc,
300    _UESState * __restrict psenc, size_t * __restrict nresult)
301{
302	wchar_t hi, lo;
303
304	if (psenc->chlen != 0)
305		return (EINVAL);
306
307	if ((ei->mode & MODE_C99) ? is_basic(wc) : (uint32_t)wc <= 0x7F) {
308		if (n-- < 1)
309			goto e2big;
310		psenc->ch[psenc->chlen++] = (char)wc;
311	} else if ((uint32_t)wc <= BMP_MAX) {
312		if (n < 6)
313			goto e2big;
314		psenc->chlen = to_str(&psenc->ch[0], wc, UCS2_BIT);
315	} else if ((ei->mode & MODE_C99) == 0 && (uint32_t)wc <= UCS2_MAX) {
316		if (n < 12)
317			goto e2big;
318		ucs_to_surrogate(wc, &hi, &lo);
319		psenc->chlen += to_str(&psenc->ch[0], hi, UCS2_BIT);
320		psenc->chlen += to_str(&psenc->ch[6], lo, UCS2_BIT);
321	} else if ((ei->mode & MODE_C99) && (uint32_t)wc <= UCS4_MAX) {
322		if (n < 10)
323			goto e2big;
324		psenc->chlen = to_str(&psenc->ch[0], wc, UCS4_BIT);
325	} else {
326		*nresult = (size_t)-1;
327		return (EILSEQ);
328	}
329	memcpy(s, psenc->ch, psenc->chlen);
330	*nresult = psenc->chlen;
331	psenc->chlen = 0;
332
333	return (0);
334
335e2big:
336	*nresult = (size_t)-1;
337	return (E2BIG);
338}
339
340/*ARGSUSED*/
341static int
342_citrus_UES_stdenc_wctocs(_UESEncodingInfo * __restrict ei __unused,
343    _csid_t * __restrict csid, _index_t * __restrict idx, wchar_t wc)
344{
345
346	*csid = 0;
347	*idx = (_index_t)wc;
348
349	return (0);
350}
351
352static __inline int
353/*ARGSUSED*/
354_citrus_UES_stdenc_cstowc(_UESEncodingInfo * __restrict ei __unused,
355    wchar_t * __restrict wc, _csid_t csid, _index_t idx)
356{
357
358	if (csid != 0)
359		return (EILSEQ);
360	*wc = (wchar_t)idx;
361
362	return (0);
363}
364
365static __inline int
366/*ARGSUSED*/
367_citrus_UES_stdenc_get_state_desc_generic(_UESEncodingInfo * __restrict ei __unused,
368    _UESState * __restrict psenc, int * __restrict rstate)
369{
370
371	*rstate = (psenc->chlen == 0) ? _STDENC_SDGEN_INITIAL :
372	    _STDENC_SDGEN_INCOMPLETE_CHAR;
373	return (0);
374}
375
376static void
377/*ARGSUSED*/
378_citrus_UES_encoding_module_uninit(_UESEncodingInfo *ei __unused)
379{
380
381	/* ei seems to be unused */
382}
383
384static int
385/*ARGSUSED*/
386_citrus_UES_encoding_module_init(_UESEncodingInfo * __restrict ei,
387    const void * __restrict var, size_t lenvar)
388{
389	const char *p;
390
391	p = var;
392	memset((void *)ei, 0, sizeof(*ei));
393	while (lenvar > 0) {
394		switch (_bcs_toupper(*p)) {
395		case 'C':
396			MATCH(C99, ei->mode |= MODE_C99);
397			break;
398		}
399		++p;
400		--lenvar;
401	}
402	ei->mb_cur_max = (ei->mode & MODE_C99) ? 10 : 12;
403
404	return (0);
405}
406
407/* ----------------------------------------------------------------------
408 * public interface for stdenc
409 */
410
411_CITRUS_STDENC_DECLS(UES);
412_CITRUS_STDENC_DEF_OPS(UES);
413
414#include "citrus_stdenc_template.h"
415