1: /*
2: * Copyright (C) 1999-2002, 2005 Free Software Foundation, Inc.
3: * This file is part of the GNU LIBICONV Library.
4: *
5: * The GNU LIBICONV Library is free software; you can redistribute it
6: * and/or modify it under the terms of the GNU Library General Public
7: * License as published by the Free Software Foundation; either version 2
8: * of the License, or (at your option) any later version.
9: *
10: * The GNU LIBICONV Library is distributed in the hope that it will be
11: * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
12: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13: * Library General Public License for more details.
14: *
15: * You should have received a copy of the GNU Library General Public
16: * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
17: * If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
18: * Fifth Floor, Boston, MA 02110-1301, USA.
19: */
20:
21: /*
22: * CP932
23: */
24:
25: /*
26: * Microsoft CP932 is a slightly extended version of SHIFT_JIS.
27: * The differences between the EASTASIA/JIS/SHIFTJIS.TXT and the
28: * VENDORS/MICSFT/WINDOWS/CP932.TXT tables found on ftp.unicode.org are
29: * as follows:
30: *
31: * 1. CP932 uses ASCII, not JISX0201 Roman.
32: *
33: * 2. Some characters in the JISX0208 range are defined differently:
34: *
35: * code SHIFTJIS.TXT CP932.TXT
36: * 0x815F 0x005C # REVERSE SOLIDUS 0xFF3C # FULLWIDTH REVERSE SOLIDUS
37: * 0x8160 0x301C # WAVE DASH 0xFF5E # FULLWIDTH TILDE
38: * 0x8161 0x2016 # DOUBLE VERTICAL LINE 0x2225 # PARALLEL TO
39: * 0x817C 0x2212 # MINUS SIGN 0xFF0D # FULLWIDTH HYPHEN-MINUS
40: * 0x8191 0x00A2 # CENT SIGN 0xFFE0 # FULLWIDTH CENT SIGN
41: * 0x8192 0x00A3 # POUND SIGN 0xFFE1 # FULLWIDTH POUND SIGN
42: * 0x81CA 0x00AC # NOT SIGN 0xFFE2 # FULLWIDTH NOT SIGN
43: *
44: * We don't implement the latter 6 of these changes, only the first one.
45: * SHIFTJIS.TXT makes more sense. However, as a compromise with user
46: * expectation, we implement the middle 5 of these changes in the
47: * Unicode to CP932 direction. We don't implement the last one at all,
48: * because it would collide with the mapping of 0xFA54.
49: *
50: * 3. A few new rows. See cp932ext.h.
51: *
52: * Many variants of CP932 (in GNU libc, JDK, OSF/1, Windows-2000, ICU) also
53: * add:
54: *
55: * 4. Private area mappings:
56: *
57: * code Unicode
58: * 0x{F0..F9}{40..7E,80..FC} U+E000..U+E757
59: *
60: * We add them too because, although there are backward compatibility problems
61: * when a character from a private area is moved to an official Unicode code
62: * point, they are useful for some people in practice.
63: */
64:
65: #include "cp932ext.h"
66:
67: /*
68: Conversion between SJIS codes (s1,s2) and JISX0208 codes (c1,c2):
69: Example. (s1,s2) = 0x8140, (c1,c2) = 0x2121.
70: 0x81 <= s1 <= 0x9F || 0xE0 <= s1 <= 0xEA,
71: 0x40 <= s2 <= 0x7E || 0x80 <= s2 <= 0xFC,
72: 0x21 <= c1 <= 0x74, 0x21 <= c2 <= 0x7E.
73: Invariant:
74: 94*2*(s1 < 0xE0 ? s1-0x81 : s1-0xC1) + (s2 < 0x80 ? s2-0x40 : s2-0x41)
75: = 94*(c1-0x21)+(c2-0x21)
76: Conversion (s1,s2) -> (c1,c2):
77: t1 := (s1 < 0xE0 ? s1-0x81 : s1-0xC1)
78: t2 := (s2 < 0x80 ? s2-0x40 : s2-0x41)
79: c1 := 2*t1 + (t2 < 0x5E ? 0 : 1) + 0x21
80: c2 := (t2 < 0x5E ? t2 : t2-0x5E) + 0x21
81: Conversion (c1,c2) -> (s1,s2):
82: t1 := (c1 - 0x21) >> 1
83: t2 := ((c1 - 0x21) & 1) * 0x5E + (c2 - 0x21)
84: s1 := (t1 < 0x1F ? t1+0x81 : t1+0xC1)
85: s2 := (t2 < 0x3F ? t2+0x40 : t2+0x41)
86: */
87:
88: static int
89: cp932_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
90: {
91: unsigned char c = *s;
92: if (c < 0x80)
93: return ascii_mbtowc(conv,pwc,s,n);
94: else if (c >= 0xa1 && c <= 0xdf)
95: return jisx0201_mbtowc(conv,pwc,s,n);
96: else {
97: unsigned char s1, s2;
98: s1 = c;
99: if ((s1 >= 0x81 && s1 <= 0x9f && s1 != 0x87) || (s1 >= 0xe0 && s1 <= 0xea)) {
100: if (n < 2)
101: return RET_TOOFEW(0);
102: s2 = s[1];
103: if ((s2 >= 0x40 && s2 <= 0x7e) || (s2 >= 0x80 && s2 <= 0xfc)) {
104: unsigned char t1 = (s1 < 0xe0 ? s1-0x81 : s1-0xc1);
105: unsigned char t2 = (s2 < 0x80 ? s2-0x40 : s2-0x41);
106: unsigned char buf[2];
107: buf[0] = 2*t1 + (t2 < 0x5e ? 0 : 1) + 0x21;
108: buf[1] = (t2 < 0x5e ? t2 : t2-0x5e) + 0x21;
109: return jisx0208_mbtowc(conv,pwc,buf,2);
110: }
111: } else if ((s1 == 0x87) || (s1 >= 0xed && s1 <= 0xee) || (s1 >= 0xfa)) {
112: if (n < 2)
113: return RET_TOOFEW(0);
114: return cp932ext_mbtowc(conv,pwc,s,2);
115: } else if (s1 >= 0xf0 && s1 <= 0xf9) {
116: /* User-defined range. See
117: * Ken Lunde's "CJKV Information Processing", table 4-66, p. 206. */
118: if (n < 2)
119: return RET_TOOFEW(0);
120: s2 = s[1];
121: if ((s2 >= 0x40 && s2 <= 0x7e) || (s2 >= 0x80 && s2 <= 0xfc)) {
122: *pwc = 0xe000 + 188*(s1 - 0xf0) + (s2 < 0x80 ? s2-0x40 : s2-0x41);
123: return 2;
124: }
125: }
126: return RET_ILSEQ;
127: }
128: }
129:
130: static int
131: cp932_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
132: {
133: unsigned char buf[2];
134: int ret;
135:
136: /* Try ASCII. */
137: ret = ascii_wctomb(conv,buf,wc,1);
138: if (ret != RET_ILUNI) {
139: unsigned char c;
140: if (ret != 1) abort();
141: c = buf[0];
142: if (c < 0x80) {
143: r[0] = c;
144: return 1;
145: }
146: }
147:
148: /* Try JIS X 0201-1976 Katakana. */
149: ret = jisx0201_wctomb(conv,buf,wc,1);
150: if (ret != RET_ILUNI) {
151: unsigned char c;
152: if (ret != 1) abort();
153: c = buf[0];
154: if (c >= 0xa1 && c <= 0xdf) {
155: r[0] = c;
156: return 1;
157: }
158: }
159:
160: /* Try JIS X 0208-1990. */
161: ret = jisx0208_wctomb(conv,buf,wc,2);
162: if (ret != RET_ILUNI) {
163: unsigned char c1, c2;
164: if (ret != 2) abort();
165: if (n < 2)
166: return RET_TOOSMALL;
167: c1 = buf[0];
168: c2 = buf[1];
169: if ((c1 >= 0x21 && c1 <= 0x74) && (c2 >= 0x21 && c2 <= 0x7e)) {
170: unsigned char t1 = (c1 - 0x21) >> 1;
171: unsigned char t2 = (((c1 - 0x21) & 1) ? 0x5e : 0) + (c2 - 0x21);
172: r[0] = (t1 < 0x1f ? t1+0x81 : t1+0xc1);
173: r[1] = (t2 < 0x3f ? t2+0x40 : t2+0x41);
174: return 2;
175: }
176: }
177:
178: /* Try CP932 extensions. */
179: ret = cp932ext_wctomb(conv,buf,wc,2);
180: if (ret != RET_ILUNI) {
181: if (ret != 2) abort();
182: if (n < 2)
183: return RET_TOOSMALL;
184: r[0] = buf[0];
185: r[1] = buf[1];
186: return 2;
187: }
188:
189: /* User-defined range. See
190: * Ken Lunde's "CJKV Information Processing", table 4-66, p. 206. */
191: if (wc >= 0xe000 && wc < 0xe758) {
192: unsigned char c1, c2;
193: if (n < 2)
194: return RET_TOOSMALL;
195: c1 = (unsigned int) (wc - 0xe000) / 188;
196: c2 = (unsigned int) (wc - 0xe000) % 188;
197: r[0] = c1+0xf0;
198: r[1] = (c2 < 0x3f ? c2+0x40 : c2+0x41);
199: return 2;
200: }
201:
202: /* Irreversible mappings. */
203: if (wc == 0xff5e) {
204: if (n < 2)
205: return RET_TOOSMALL;
206: r[0] = 0x81;
207: r[1] = 0x60;
208: return 2;
209: }
210: if (wc == 0x2225) {
211: if (n < 2)
212: return RET_TOOSMALL;
213: r[0] = 0x81;
214: r[1] = 0x61;
215: return 2;
216: }
217: if (wc == 0xff0d) {
218: if (n < 2)
219: return RET_TOOSMALL;
220: r[0] = 0x81;
221: r[1] = 0x7c;
222: return 2;
223: }
224: if (wc == 0xffe0) {
225: if (n < 2)
226: return RET_TOOSMALL;
227: r[0] = 0x81;
228: r[1] = 0x91;
229: return 2;
230: }
231: if (wc == 0xffe1) {
232: if (n < 2)
233: return RET_TOOSMALL;
234: r[0] = 0x81;
235: r[1] = 0x92;
236: return 2;
237: }
238:
239: return RET_ILUNI;
240: }
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