xref: /PHP-5.4/ext/mbstring/oniguruma/enc/sjis.c (revision e95f9a0e)
1 /**********************************************************************
2   sjis.c -  Oniguruma (regular expression library)
3 **********************************************************************/
4 /*-
5  * Copyright (c) 2002-2005  K.Kosako  <sndgk393 AT ybb DOT ne DOT jp>
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 "regenc.h"
31 
32 static const int EncLen_SJIS[] = {
33   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
34   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
35   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
36   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
37   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
38   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
39   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
40   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
41   1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
42   2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
43   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
44   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
45   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
46   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
47   2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
48   2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1
49 };
50 
51 static const char SJIS_CAN_BE_TRAIL_TABLE[256] = {
52   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
53   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
54   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
55   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
56   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
57   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
58   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
59   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
60   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
61   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
62   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
63   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
64   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
65   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
66   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
67   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0
68 };
69 
70 #define SJIS_ISMB_FIRST(byte)  (EncLen_SJIS[byte] > 1)
71 #define SJIS_ISMB_TRAIL(byte)  SJIS_CAN_BE_TRAIL_TABLE[(byte)]
72 
73 static int
sjis_mbc_enc_len(const UChar * p)74 sjis_mbc_enc_len(const UChar* p)
75 {
76   return EncLen_SJIS[*p];
77 }
78 
79 static int
sjis_code_to_mbclen(OnigCodePoint code)80 sjis_code_to_mbclen(OnigCodePoint code)
81 {
82   if (code < 256) {
83     if (EncLen_SJIS[(int )code] == 1)
84       return 1;
85     else
86       return 0;
87   }
88   else if (code <= 0xffff) {
89     return 2;
90   }
91   else
92     return 0;
93 }
94 
95 static OnigCodePoint
sjis_mbc_to_code(const UChar * p,const UChar * end)96 sjis_mbc_to_code(const UChar* p, const UChar* end)
97 {
98   int c, i, len;
99   OnigCodePoint n;
100 
101   len = enc_len(ONIG_ENCODING_SJIS, p);
102   c = *p++;
103   n = c;
104   if (len == 1) return n;
105 
106   for (i = 1; i < len; i++) {
107     if (p >= end) break;
108     c = *p++;
109     n <<= 8;  n += c;
110   }
111   return n;
112 }
113 
114 static int
sjis_code_to_mbc(OnigCodePoint code,UChar * buf)115 sjis_code_to_mbc(OnigCodePoint code, UChar *buf)
116 {
117   UChar *p = buf;
118 
119   if ((code & 0xff00) != 0) *p++ = (UChar )(((code >>  8) & 0xff));
120   *p++ = (UChar )(code & 0xff);
121 
122 #if 0
123   if (enc_len(ONIG_ENCODING_SJIS, buf) != (p - buf))
124     return REGERR_INVALID_WIDE_CHAR_VALUE;
125 #endif
126   return p - buf;
127 }
128 
129 static int
sjis_mbc_to_normalize(OnigAmbigType flag,const UChar ** pp,const UChar * end,UChar * lower)130 sjis_mbc_to_normalize(OnigAmbigType flag,
131 		      const UChar** pp, const UChar* end, UChar* lower)
132 {
133   const UChar* p = *pp;
134 
135   if (ONIGENC_IS_MBC_ASCII(p)) {
136     if ((flag & ONIGENC_AMBIGUOUS_MATCH_ASCII_CASE) != 0) {
137       *lower = ONIGENC_ASCII_CODE_TO_LOWER_CASE(*p);
138     }
139     else {
140       *lower = *p;
141     }
142 
143     (*pp)++;
144     return 1;
145   }
146   else {
147     int len = enc_len(ONIG_ENCODING_SJIS, p);
148 
149     if (lower != p) {
150       int i;
151       for (i = 0; i < len; i++) {
152 	*lower++ = *p++;
153       }
154     }
155     (*pp) += len;
156     return len; /* return byte length of converted char to lower */
157   }
158 }
159 
160 static int
sjis_is_mbc_ambiguous(OnigAmbigType flag,const UChar ** pp,const UChar * end)161 sjis_is_mbc_ambiguous(OnigAmbigType flag, const UChar** pp, const UChar* end)
162 {
163   return onigenc_mbn_is_mbc_ambiguous(ONIG_ENCODING_SJIS, flag, pp, end);
164 
165 }
166 
167 static int
sjis_is_code_ctype(OnigCodePoint code,unsigned int ctype)168 sjis_is_code_ctype(OnigCodePoint code, unsigned int ctype)
169 {
170   if (code < 128)
171     return ONIGENC_IS_ASCII_CODE_CTYPE(code, ctype);
172   else {
173     if ((ctype & (ONIGENC_CTYPE_WORD |
174                   ONIGENC_CTYPE_GRAPH | ONIGENC_CTYPE_PRINT)) != 0) {
175       return (sjis_code_to_mbclen(code) > 1 ? TRUE : FALSE);
176     }
177   }
178 
179   return FALSE;
180 }
181 
182 static UChar*
sjis_left_adjust_char_head(const UChar * start,const UChar * s)183 sjis_left_adjust_char_head(const UChar* start, const UChar* s)
184 {
185   const UChar *p;
186   int len;
187 
188   if (s <= start) return (UChar* )s;
189   p = s;
190 
191   if (SJIS_ISMB_TRAIL(*p)) {
192     while (p > start) {
193       if (! SJIS_ISMB_FIRST(*--p)) {
194 	p++;
195 	break;
196       }
197     }
198   }
199   len = enc_len(ONIG_ENCODING_SJIS, p);
200   if (p + len > s) return (UChar* )p;
201   p += len;
202   return (UChar* )(p + ((s - p) & ~1));
203 }
204 
205 static int
sjis_is_allowed_reverse_match(const UChar * s,const UChar * end)206 sjis_is_allowed_reverse_match(const UChar* s, const UChar* end)
207 {
208   const UChar c = *s;
209   return (SJIS_ISMB_TRAIL(c) ? FALSE : TRUE);
210 }
211 
212 OnigEncodingType OnigEncodingSJIS = {
213   sjis_mbc_enc_len,
214   "Shift_JIS",   /* name */
215   2,             /* max byte length */
216   1,             /* min byte length */
217   ONIGENC_AMBIGUOUS_MATCH_ASCII_CASE,
218   {
219       (OnigCodePoint )'\\'                       /* esc */
220     , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* anychar '.'  */
221     , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* anytime '*'  */
222     , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* zero or one time '?' */
223     , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* one or more time '+' */
224     , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* anychar anytime */
225   },
226   onigenc_is_mbc_newline_0x0a,
227   sjis_mbc_to_code,
228   sjis_code_to_mbclen,
229   sjis_code_to_mbc,
230   sjis_mbc_to_normalize,
231   sjis_is_mbc_ambiguous,
232   onigenc_ascii_get_all_pair_ambig_codes,
233   onigenc_nothing_get_all_comp_ambig_codes,
234   sjis_is_code_ctype,
235   onigenc_not_support_get_ctype_code_range,
236   sjis_left_adjust_char_head,
237   sjis_is_allowed_reverse_match
238 };
239