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, write to the Free Software Foundation, Inc., 51 Franklin Street,
18: * Fifth Floor, Boston, MA 02110-1301, USA.
19: */
20:
21: /*
22: * SHIFT_JISX0213
23: */
24:
25: /* The structure of Shift_JISX0213 is as follows:
26:
27: 0x00..0x7F: ISO646-JP, an ASCII variant
28:
29: 0x{A1..DF}: JISX0201 Katakana.
30:
31: 0x{81..9F,E0..EF}{40..7E,80..FC}: JISX0213 plane 1.
32:
33: 0x{F0..FC}{40..7E,80..FC}: JISX0213 plane 2, with irregular row mapping.
34:
35: Note that some JISX0213 characters are not contained in Unicode 3.2
36: and are therefore best represented as sequences of Unicode characters.
37: */
38:
39: #include "jisx0213.h"
40: #include "flushwc.h"
41:
42: static int
43: shift_jisx0213_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
44: {
45: ucs4_t last_wc = conv->istate;
46: if (last_wc) {
47: /* Output the buffered character. */
48: conv->istate = 0;
49: *pwc = last_wc;
50: return 0; /* Don't advance the input pointer. */
51: } else {
52: unsigned char c = *s;
53: if (c < 0x80) {
54: /* Plain ISO646-JP character. */
55: if (c == 0x5c)
56: *pwc = (ucs4_t) 0x00a5;
57: else if (c == 0x7e)
58: *pwc = (ucs4_t) 0x203e;
59: else
60: *pwc = (ucs4_t) c;
61: return 1;
62: } else if (c >= 0xa1 && c <= 0xdf) {
63: *pwc = c + 0xfec0;
64: return 1;
65: } else {
66: if ((c >= 0x81 && c <= 0x9f) || (c >= 0xe0 && c <= 0xfc)) {
67: /* Two byte character. */
68: if (n >= 2) {
69: unsigned char c2 = s[1];
70: if ((c2 >= 0x40 && c2 <= 0x7e) || (c2 >= 0x80 && c2 <= 0xfc)) {
71: unsigned int c1;
72: ucs4_t wc;
73: /* Convert to row and column. */
74: if (c < 0xe0)
75: c -= 0x81;
76: else
77: c -= 0xc1;
78: if (c2 < 0x80)
79: c2 -= 0x40;
80: else
81: c2 -= 0x41;
82: /* Now 0 <= c <= 0x3b, 0 <= c2 <= 0xbb. */
83: c1 = 2 * c;
84: if (c2 >= 0x5e)
85: c2 -= 0x5e, c1++;
86: c2 += 0x21;
87: if (c1 >= 0x5e) {
88: /* Handling of JISX 0213 plane 2 rows. */
89: if (c1 >= 0x67)
90: c1 += 230;
91: else if (c1 >= 0x63 || c1 == 0x5f)
92: c1 += 168;
93: else
94: c1 += 162;
95: }
96: wc = jisx0213_to_ucs4(0x121+c1,c2);
97: if (wc) {
98: if (wc < 0x80) {
99: /* It's a combining character. */
100: ucs4_t wc1 = jisx0213_to_ucs_combining[wc - 1][0];
101: ucs4_t wc2 = jisx0213_to_ucs_combining[wc - 1][1];
102: /* We cannot output two Unicode characters at once. So,
103: output the first character and buffer the second one. */
104: *pwc = wc1;
105: conv->istate = wc2;
106: } else
107: *pwc = wc;
108: return 2;
109: }
110: }
111: } else
112: return RET_TOOFEW(0);
113: }
114: return RET_ILSEQ;
115: }
116: }
117: }
118:
119: #define shift_jisx0213_flushwc normal_flushwc
120:
121: /* Composition tables for each of the relevant combining characters. */
122: static const struct { unsigned short base; unsigned short composed; } shift_jisx0213_comp_table_data[] = {
123: #define shift_jisx0213_comp_table02e5_idx 0
124: #define shift_jisx0213_comp_table02e5_len 1
125: { 0x8684, 0x8685 }, /* 0x12B65 = 0x12B64 U+02E5 */
126: #define shift_jisx0213_comp_table02e9_idx (shift_jisx0213_comp_table02e5_idx+shift_jisx0213_comp_table02e5_len)
127: #define shift_jisx0213_comp_table02e9_len 1
128: { 0x8680, 0x8686 }, /* 0x12B66 = 0x12B60 U+02E9 */
129: #define shift_jisx0213_comp_table0300_idx (shift_jisx0213_comp_table02e9_idx+shift_jisx0213_comp_table02e9_len)
130: #define shift_jisx0213_comp_table0300_len 5
131: { 0x857b, 0x8663 }, /* 0x12B44 = 0x1295C U+0300 */
132: { 0x8657, 0x8667 }, /* 0x12B48 = 0x12B38 U+0300 */
133: { 0x8656, 0x8669 }, /* 0x12B4A = 0x12B37 U+0300 */
134: { 0x864f, 0x866b }, /* 0x12B4C = 0x12B30 U+0300 */
135: { 0x8662, 0x866d }, /* 0x12B4E = 0x12B43 U+0300 */
136: #define shift_jisx0213_comp_table0301_idx (shift_jisx0213_comp_table0300_idx+shift_jisx0213_comp_table0300_len)
137: #define shift_jisx0213_comp_table0301_len 4
138: { 0x8657, 0x8668 }, /* 0x12B49 = 0x12B38 U+0301 */
139: { 0x8656, 0x866a }, /* 0x12B4B = 0x12B37 U+0301 */
140: { 0x864f, 0x866c }, /* 0x12B4D = 0x12B30 U+0301 */
141: { 0x8662, 0x866e }, /* 0x12B4F = 0x12B43 U+0301 */
142: #define shift_jisx0213_comp_table309a_idx (shift_jisx0213_comp_table0301_idx+shift_jisx0213_comp_table0301_len)
143: #define shift_jisx0213_comp_table309a_len 14
144: { 0x82a9, 0x82f5 }, /* 0x12477 = 0x1242B U+309A */
145: { 0x82ab, 0x82f6 }, /* 0x12478 = 0x1242D U+309A */
146: { 0x82ad, 0x82f7 }, /* 0x12479 = 0x1242F U+309A */
147: { 0x82af, 0x82f8 }, /* 0x1247A = 0x12431 U+309A */
148: { 0x82b1, 0x82f9 }, /* 0x1247B = 0x12433 U+309A */
149: { 0x834a, 0x8397 }, /* 0x12577 = 0x1252B U+309A */
150: { 0x834c, 0x8398 }, /* 0x12578 = 0x1252D U+309A */
151: { 0x834e, 0x8399 }, /* 0x12579 = 0x1252F U+309A */
152: { 0x8350, 0x839a }, /* 0x1257A = 0x12531 U+309A */
153: { 0x8352, 0x839b }, /* 0x1257B = 0x12533 U+309A */
154: { 0x835a, 0x839c }, /* 0x1257C = 0x1253B U+309A */
155: { 0x8363, 0x839d }, /* 0x1257D = 0x12544 U+309A */
156: { 0x8367, 0x839e }, /* 0x1257E = 0x12548 U+309A */
157: { 0x83f3, 0x83f6 }, /* 0x12678 = 0x12675 U+309A */
158: };
159:
160: static int
161: shift_jisx0213_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
162: {
163: int count = 0;
164: unsigned short lasttwo = conv->ostate;
165:
166: if (lasttwo) {
167: /* Attempt to combine the last character with this one. */
168: unsigned int idx;
169: unsigned int len;
170:
171: if (wc == 0x02e5)
172: idx = shift_jisx0213_comp_table02e5_idx,
173: len = shift_jisx0213_comp_table02e5_len;
174: else if (wc == 0x02e9)
175: idx = shift_jisx0213_comp_table02e9_idx,
176: len = shift_jisx0213_comp_table02e9_len;
177: else if (wc == 0x0300)
178: idx = shift_jisx0213_comp_table0300_idx,
179: len = shift_jisx0213_comp_table0300_len;
180: else if (wc == 0x0301)
181: idx = shift_jisx0213_comp_table0301_idx,
182: len = shift_jisx0213_comp_table0301_len;
183: else if (wc == 0x309a)
184: idx = shift_jisx0213_comp_table309a_idx,
185: len = shift_jisx0213_comp_table309a_len;
186: else
187: goto not_combining;
188:
189: do
190: if (shift_jisx0213_comp_table_data[idx].base == lasttwo)
191: break;
192: while (++idx, --len > 0);
193:
194: if (len > 0) {
195: /* Output the combined character. */
196: if (n >= 2) {
197: lasttwo = shift_jisx0213_comp_table_data[idx].composed;
198: r[0] = (lasttwo >> 8) & 0xff;
199: r[1] = lasttwo & 0xff;
200: conv->ostate = 0;
201: return 2;
202: } else
203: return RET_TOOSMALL;
204: }
205:
206: not_combining:
207: /* Output the buffered character. */
208: if (n < 2)
209: return RET_TOOSMALL;
210: r[0] = (lasttwo >> 8) & 0xff;
211: r[1] = lasttwo & 0xff;
212: r += 2;
213: count = 2;
214: }
215:
216: if (wc < 0x80 && wc != 0x5c && wc != 0x7e) {
217: /* Plain ISO646-JP character. */
218: if (n > count) {
219: r[0] = (unsigned char) wc;
220: conv->ostate = 0;
221: return count+1;
222: } else
223: return RET_TOOSMALL;
224: } else if (wc == 0x00a5) {
225: if (n > count) {
226: r[0] = 0x5c;
227: conv->ostate = 0;
228: return count+1;
229: } else
230: return RET_TOOSMALL;
231: } else if (wc == 0x203e) {
232: if (n > count) {
233: r[0] = 0x7e;
234: conv->ostate = 0;
235: return count+1;
236: } else
237: return RET_TOOSMALL;
238: } else if (wc >= 0xff61 && wc <= 0xff9f) {
239: /* Half-width katakana. */
240: if (n > count) {
241: r[0] = wc - 0xfec0;
242: conv->ostate = 0;
243: return count+1;
244: } else
245: return RET_TOOSMALL;
246: } else {
247: unsigned int s1, s2;
248: unsigned short jch = ucs4_to_jisx0213(wc);
249: if (jch != 0) {
250: /* Convert it to shifted representation. */
251: s1 = jch >> 8;
252: s2 = jch & 0x7f;
253: s1 -= 0x21;
254: s2 -= 0x21;
255: if (s1 >= 0x5e) {
256: /* Handling of JISX 0213 plane 2 rows. */
257: if (s1 >= 0xcd) /* rows 0x26E..0x27E */
258: s1 -= 102;
259: else if (s1 >= 0x8b || s1 == 0x87) /* rows 0x228, 0x22C..0x22F */
260: s1 -= 40;
261: else /* rows 0x221, 0x223..0x225 */
262: s1 -= 34;
263: /* Now 0x5e <= s1 <= 0x77. */
264: }
265: if (s1 & 1)
266: s2 += 0x5e;
267: s1 = s1 >> 1;
268: if (s1 < 0x1f)
269: s1 += 0x81;
270: else
271: s1 += 0xc1;
272: if (s2 < 0x3f)
273: s2 += 0x40;
274: else
275: s2 += 0x41;
276: if (jch & 0x0080) {
277: /* A possible match in comp_table_data. We have to buffer it. */
278: /* We know it's a JISX 0213 plane 1 character. */
279: if (jch & 0x8000) abort();
280: conv->ostate = (s1 << 8) | s2;
281: return count+0;
282: }
283: /* Output the shifted representation. */
284: if (n >= count+2) {
285: r[0] = s1;
286: r[1] = s2;
287: conv->ostate = 0;
288: return count+2;
289: } else
290: return RET_TOOSMALL;
291: }
292: return RET_ILUNI;
293: }
294: }
295:
296: static int
297: shift_jisx0213_reset (conv_t conv, unsigned char *r, int n)
298: {
299: state_t lasttwo = conv->ostate;
300:
301: if (lasttwo) {
302: if (n < 2)
303: return RET_TOOSMALL;
304: r[0] = (lasttwo >> 8) & 0xff;
305: r[1] = lasttwo & 0xff;
306: /* conv->ostate = 0; will be done by the caller */
307: return 2;
308: } else
309: return 0;
310: }
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