1: /*
2: * Copyright (C) 1999-2002 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, see <https://www.gnu.org/licenses/>.
18: */
19:
20: /*
21: * SHIFT_JISX0213
22: */
23:
24: /* The structure of Shift_JISX0213 is as follows:
25:
26: 0x00..0x7F: ISO646-JP, an ASCII variant
27:
28: 0x{A1..DF}: JISX0201 Katakana.
29:
30: 0x{81..9F,E0..EF}{40..7E,80..FC}: JISX0213 plane 1.
31:
32: 0x{F0..FC}{40..7E,80..FC}: JISX0213 plane 2, with irregular row mapping.
33:
34: Note that some JISX0213 characters are not contained in Unicode 3.2
35: and are therefore best represented as sequences of Unicode characters.
36: */
37:
38: #include "jisx0213.h"
39: #include "flushwc.h"
40:
41: static int
42: shift_jisx0213_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
43: {
44: ucs4_t last_wc = conv->istate;
45: if (last_wc) {
46: /* Output the buffered character. */
47: conv->istate = 0;
48: *pwc = last_wc;
49: return 0; /* Don't advance the input pointer. */
50: } else {
51: unsigned char c = *s;
52: if (c < 0x80) {
53: /* Plain ISO646-JP character. */
54: if (c == 0x5c)
55: *pwc = (ucs4_t) 0x00a5;
56: else if (c == 0x7e)
57: *pwc = (ucs4_t) 0x203e;
58: else
59: *pwc = (ucs4_t) c;
60: return 1;
61: } else if (c >= 0xa1 && c <= 0xdf) {
62: *pwc = c + 0xfec0;
63: return 1;
64: } else {
65: if ((c >= 0x81 && c <= 0x9f) || (c >= 0xe0 && c <= 0xfc)) {
66: /* Two byte character. */
67: if (n >= 2) {
68: unsigned char c2 = s[1];
69: if ((c2 >= 0x40 && c2 <= 0x7e) || (c2 >= 0x80 && c2 <= 0xfc)) {
70: unsigned int c1;
71: ucs4_t wc;
72: /* Convert to row and column. */
73: if (c < 0xe0)
74: c -= 0x81;
75: else
76: c -= 0xc1;
77: if (c2 < 0x80)
78: c2 -= 0x40;
79: else
80: c2 -= 0x41;
81: /* Now 0 <= c <= 0x3b, 0 <= c2 <= 0xbb. */
82: c1 = 2 * c;
83: if (c2 >= 0x5e)
84: c2 -= 0x5e, c1++;
85: c2 += 0x21;
86: if (c1 >= 0x5e) {
87: /* Handling of JISX 0213 plane 2 rows. */
88: if (c1 >= 0x67)
89: c1 += 230;
90: else if (c1 >= 0x63 || c1 == 0x5f)
91: c1 += 168;
92: else
93: c1 += 162;
94: }
95: wc = jisx0213_to_ucs4(0x121+c1,c2);
96: if (wc) {
97: if (wc < 0x80) {
98: /* It's a combining character. */
99: ucs4_t wc1 = jisx0213_to_ucs_combining[wc - 1][0];
100: ucs4_t wc2 = jisx0213_to_ucs_combining[wc - 1][1];
101: /* We cannot output two Unicode characters at once. So,
102: output the first character and buffer the second one. */
103: *pwc = wc1;
104: conv->istate = wc2;
105: } else
106: *pwc = wc;
107: return 2;
108: }
109: }
110: } else
111: return RET_TOOFEW(0);
112: }
113: return RET_ILSEQ;
114: }
115: }
116: }
117:
118: #define shift_jisx0213_flushwc normal_flushwc
119:
120: /* Composition tables for each of the relevant combining characters. */
121: static const struct { unsigned short base; unsigned short composed; } shift_jisx0213_comp_table_data[] = {
122: #define shift_jisx0213_comp_table02e5_idx 0
123: #define shift_jisx0213_comp_table02e5_len 1
124: { 0x8684, 0x8685 }, /* 0x12B65 = 0x12B64 U+02E5 */
125: #define shift_jisx0213_comp_table02e9_idx (shift_jisx0213_comp_table02e5_idx+shift_jisx0213_comp_table02e5_len)
126: #define shift_jisx0213_comp_table02e9_len 1
127: { 0x8680, 0x8686 }, /* 0x12B66 = 0x12B60 U+02E9 */
128: #define shift_jisx0213_comp_table0300_idx (shift_jisx0213_comp_table02e9_idx+shift_jisx0213_comp_table02e9_len)
129: #define shift_jisx0213_comp_table0300_len 5
130: { 0x857b, 0x8663 }, /* 0x12B44 = 0x1295C U+0300 */
131: { 0x8657, 0x8667 }, /* 0x12B48 = 0x12B38 U+0300 */
132: { 0x8656, 0x8669 }, /* 0x12B4A = 0x12B37 U+0300 */
133: { 0x864f, 0x866b }, /* 0x12B4C = 0x12B30 U+0300 */
134: { 0x8662, 0x866d }, /* 0x12B4E = 0x12B43 U+0300 */
135: #define shift_jisx0213_comp_table0301_idx (shift_jisx0213_comp_table0300_idx+shift_jisx0213_comp_table0300_len)
136: #define shift_jisx0213_comp_table0301_len 4
137: { 0x8657, 0x8668 }, /* 0x12B49 = 0x12B38 U+0301 */
138: { 0x8656, 0x866a }, /* 0x12B4B = 0x12B37 U+0301 */
139: { 0x864f, 0x866c }, /* 0x12B4D = 0x12B30 U+0301 */
140: { 0x8662, 0x866e }, /* 0x12B4F = 0x12B43 U+0301 */
141: #define shift_jisx0213_comp_table309a_idx (shift_jisx0213_comp_table0301_idx+shift_jisx0213_comp_table0301_len)
142: #define shift_jisx0213_comp_table309a_len 14
143: { 0x82a9, 0x82f5 }, /* 0x12477 = 0x1242B U+309A */
144: { 0x82ab, 0x82f6 }, /* 0x12478 = 0x1242D U+309A */
145: { 0x82ad, 0x82f7 }, /* 0x12479 = 0x1242F U+309A */
146: { 0x82af, 0x82f8 }, /* 0x1247A = 0x12431 U+309A */
147: { 0x82b1, 0x82f9 }, /* 0x1247B = 0x12433 U+309A */
148: { 0x834a, 0x8397 }, /* 0x12577 = 0x1252B U+309A */
149: { 0x834c, 0x8398 }, /* 0x12578 = 0x1252D U+309A */
150: { 0x834e, 0x8399 }, /* 0x12579 = 0x1252F U+309A */
151: { 0x8350, 0x839a }, /* 0x1257A = 0x12531 U+309A */
152: { 0x8352, 0x839b }, /* 0x1257B = 0x12533 U+309A */
153: { 0x835a, 0x839c }, /* 0x1257C = 0x1253B U+309A */
154: { 0x8363, 0x839d }, /* 0x1257D = 0x12544 U+309A */
155: { 0x8367, 0x839e }, /* 0x1257E = 0x12548 U+309A */
156: { 0x83f3, 0x83f6 }, /* 0x12678 = 0x12675 U+309A */
157: };
158:
159: static int
160: shift_jisx0213_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
161: {
162: int count = 0;
163: unsigned short lasttwo = conv->ostate;
164:
165: if (lasttwo) {
166: /* Attempt to combine the last character with this one. */
167: unsigned int idx;
168: unsigned int len;
169:
170: if (wc == 0x02e5)
171: idx = shift_jisx0213_comp_table02e5_idx,
172: len = shift_jisx0213_comp_table02e5_len;
173: else if (wc == 0x02e9)
174: idx = shift_jisx0213_comp_table02e9_idx,
175: len = shift_jisx0213_comp_table02e9_len;
176: else if (wc == 0x0300)
177: idx = shift_jisx0213_comp_table0300_idx,
178: len = shift_jisx0213_comp_table0300_len;
179: else if (wc == 0x0301)
180: idx = shift_jisx0213_comp_table0301_idx,
181: len = shift_jisx0213_comp_table0301_len;
182: else if (wc == 0x309a)
183: idx = shift_jisx0213_comp_table309a_idx,
184: len = shift_jisx0213_comp_table309a_len;
185: else
186: goto not_combining;
187:
188: do
189: if (shift_jisx0213_comp_table_data[idx].base == lasttwo)
190: break;
191: while (++idx, --len > 0);
192:
193: if (len > 0) {
194: /* Output the combined character. */
195: if (n >= 2) {
196: lasttwo = shift_jisx0213_comp_table_data[idx].composed;
197: r[0] = (lasttwo >> 8) & 0xff;
198: r[1] = lasttwo & 0xff;
199: conv->ostate = 0;
200: return 2;
201: } else
202: return RET_TOOSMALL;
203: }
204:
205: not_combining:
206: /* Output the buffered character. */
207: if (n < 2)
208: return RET_TOOSMALL;
209: r[0] = (lasttwo >> 8) & 0xff;
210: r[1] = lasttwo & 0xff;
211: r += 2;
212: count = 2;
213: }
214:
215: if (wc < 0x80 && wc != 0x5c && wc != 0x7e) {
216: /* Plain ISO646-JP character. */
217: if (n > count) {
218: r[0] = (unsigned char) wc;
219: conv->ostate = 0;
220: return count+1;
221: } else
222: return RET_TOOSMALL;
223: } else if (wc == 0x00a5) {
224: if (n > count) {
225: r[0] = 0x5c;
226: conv->ostate = 0;
227: return count+1;
228: } else
229: return RET_TOOSMALL;
230: } else if (wc == 0x203e) {
231: if (n > count) {
232: r[0] = 0x7e;
233: conv->ostate = 0;
234: return count+1;
235: } else
236: return RET_TOOSMALL;
237: } else if (wc >= 0xff61 && wc <= 0xff9f) {
238: /* Half-width katakana. */
239: if (n > count) {
240: r[0] = wc - 0xfec0;
241: conv->ostate = 0;
242: return count+1;
243: } else
244: return RET_TOOSMALL;
245: } else {
246: unsigned int s1, s2;
247: unsigned short jch = ucs4_to_jisx0213(wc);
248: if (jch != 0) {
249: /* Convert it to shifted representation. */
250: s1 = jch >> 8;
251: s2 = jch & 0x7f;
252: s1 -= 0x21;
253: s2 -= 0x21;
254: if (s1 >= 0x5e) {
255: /* Handling of JISX 0213 plane 2 rows. */
256: if (s1 >= 0xcd) /* rows 0x26E..0x27E */
257: s1 -= 102;
258: else if (s1 >= 0x8b || s1 == 0x87) /* rows 0x228, 0x22C..0x22F */
259: s1 -= 40;
260: else /* rows 0x221, 0x223..0x225 */
261: s1 -= 34;
262: /* Now 0x5e <= s1 <= 0x77. */
263: }
264: if (s1 & 1)
265: s2 += 0x5e;
266: s1 = s1 >> 1;
267: if (s1 < 0x1f)
268: s1 += 0x81;
269: else
270: s1 += 0xc1;
271: if (s2 < 0x3f)
272: s2 += 0x40;
273: else
274: s2 += 0x41;
275: if (jch & 0x0080) {
276: /* A possible match in comp_table_data. We have to buffer it. */
277: /* We know it's a JISX 0213 plane 1 character. */
278: if (jch & 0x8000) abort();
279: conv->ostate = (s1 << 8) | s2;
280: return count+0;
281: }
282: /* Output the shifted representation. */
283: if (n >= count+2) {
284: r[0] = s1;
285: r[1] = s2;
286: conv->ostate = 0;
287: return count+2;
288: } else
289: return RET_TOOSMALL;
290: }
291: return RET_ILUNI;
292: }
293: }
294:
295: static int
296: shift_jisx0213_reset (conv_t conv, unsigned char *r, size_t n)
297: {
298: state_t lasttwo = conv->ostate;
299:
300: if (lasttwo) {
301: if (n < 2)
302: return RET_TOOSMALL;
303: r[0] = (lasttwo >> 8) & 0xff;
304: r[1] = lasttwo & 0xff;
305: /* conv->ostate = 0; will be done by the caller */
306: return 2;
307: } else
308: return 0;
309: }
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