Annotation of embedaddon/libiconv/lib/euc_jisx0213.h, revision 1.1.1.1
1.1 misho 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: * EUC-JISX0213
23: */
24:
25: /* The structure of EUC-JISX0213 is as follows:
26:
27: 0x00..0x7F: ASCII
28:
29: 0x8E{A1..FE}: JISX0201 Katakana, with prefix 0x8E, offset by +0x80.
30:
31: 0x8F{A1..FE}{A1..FE}: JISX0213 plane 2, with prefix 0x8F, offset by +0x8080.
32:
33: 0x{A1..FE}{A1..FE}: JISX0213 plane 1, offset by +0x8080.
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: euc_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 ASCII character. */
55: *pwc = (ucs4_t) c;
56: return 1;
57: } else {
58: if ((c >= 0xa1 && c <= 0xfe) || c == 0x8e || c == 0x8f) {
59: /* Two or three byte character. */
60: if (n >= 2) {
61: unsigned char c2 = s[1];
62: if (c2 >= 0xa1 && c2 <= 0xfe) {
63: if (c == 0x8e) {
64: /* Half-width katakana. */
65: if (c2 <= 0xdf) {
66: *pwc = c2 + 0xfec0;
67: return 2;
68: }
69: } else {
70: ucs4_t wc;
71: if (c == 0x8f) {
72: /* JISX 0213 plane 2. */
73: if (n >= 3) {
74: unsigned char c3 = s[2];
75: wc = jisx0213_to_ucs4(0x200-0x80+c2,c3^0x80);
76: } else
77: return RET_TOOFEW(0);
78: } else {
79: /* JISX 0213 plane 1. */
80: wc = jisx0213_to_ucs4(0x100-0x80+c,c2^0x80);
81: }
82: if (wc) {
83: if (wc < 0x80) {
84: /* It's a combining character. */
85: ucs4_t wc1 = jisx0213_to_ucs_combining[wc - 1][0];
86: ucs4_t wc2 = jisx0213_to_ucs_combining[wc - 1][1];
87: /* We cannot output two Unicode characters at once. So,
88: output the first character and buffer the second one. */
89: *pwc = wc1;
90: conv->istate = wc2;
91: } else
92: *pwc = wc;
93: return (c == 0x8f ? 3 : 2);
94: }
95: }
96: }
97: } else
98: return RET_TOOFEW(0);
99: }
100: return RET_ILSEQ;
101: }
102: }
103: }
104:
105: #define euc_jisx0213_flushwc normal_flushwc
106:
107: /* Composition tables for each of the relevant combining characters. */
108: static const struct { unsigned short base; unsigned short composed; } euc_jisx0213_comp_table_data[] = {
109: #define euc_jisx0213_comp_table02e5_idx 0
110: #define euc_jisx0213_comp_table02e5_len 1
111: { 0xabe4, 0xabe5 }, /* 0x12B65 = 0x12B64 U+02E5 */
112: #define euc_jisx0213_comp_table02e9_idx (euc_jisx0213_comp_table02e5_idx+euc_jisx0213_comp_table02e5_len)
113: #define euc_jisx0213_comp_table02e9_len 1
114: { 0xabe0, 0xabe6 }, /* 0x12B66 = 0x12B60 U+02E9 */
115: #define euc_jisx0213_comp_table0300_idx (euc_jisx0213_comp_table02e9_idx+euc_jisx0213_comp_table02e9_len)
116: #define euc_jisx0213_comp_table0300_len 5
117: { 0xa9dc, 0xabc4 }, /* 0x12B44 = 0x1295C U+0300 */
118: { 0xabb8, 0xabc8 }, /* 0x12B48 = 0x12B38 U+0300 */
119: { 0xabb7, 0xabca }, /* 0x12B4A = 0x12B37 U+0300 */
120: { 0xabb0, 0xabcc }, /* 0x12B4C = 0x12B30 U+0300 */
121: { 0xabc3, 0xabce }, /* 0x12B4E = 0x12B43 U+0300 */
122: #define euc_jisx0213_comp_table0301_idx (euc_jisx0213_comp_table0300_idx+euc_jisx0213_comp_table0300_len)
123: #define euc_jisx0213_comp_table0301_len 4
124: { 0xabb8, 0xabc9 }, /* 0x12B49 = 0x12B38 U+0301 */
125: { 0xabb7, 0xabcb }, /* 0x12B4B = 0x12B37 U+0301 */
126: { 0xabb0, 0xabcd }, /* 0x12B4D = 0x12B30 U+0301 */
127: { 0xabc3, 0xabcf }, /* 0x12B4F = 0x12B43 U+0301 */
128: #define euc_jisx0213_comp_table309a_idx (euc_jisx0213_comp_table0301_idx+euc_jisx0213_comp_table0301_len)
129: #define euc_jisx0213_comp_table309a_len 14
130: { 0xa4ab, 0xa4f7 }, /* 0x12477 = 0x1242B U+309A */
131: { 0xa4ad, 0xa4f8 }, /* 0x12478 = 0x1242D U+309A */
132: { 0xa4af, 0xa4f9 }, /* 0x12479 = 0x1242F U+309A */
133: { 0xa4b1, 0xa4fa }, /* 0x1247A = 0x12431 U+309A */
134: { 0xa4b3, 0xa4fb }, /* 0x1247B = 0x12433 U+309A */
135: { 0xa5ab, 0xa5f7 }, /* 0x12577 = 0x1252B U+309A */
136: { 0xa5ad, 0xa5f8 }, /* 0x12578 = 0x1252D U+309A */
137: { 0xa5af, 0xa5f9 }, /* 0x12579 = 0x1252F U+309A */
138: { 0xa5b1, 0xa5fa }, /* 0x1257A = 0x12531 U+309A */
139: { 0xa5b3, 0xa5fb }, /* 0x1257B = 0x12533 U+309A */
140: { 0xa5bb, 0xa5fc }, /* 0x1257C = 0x1253B U+309A */
141: { 0xa5c4, 0xa5fd }, /* 0x1257D = 0x12544 U+309A */
142: { 0xa5c8, 0xa5fe }, /* 0x1257E = 0x12548 U+309A */
143: { 0xa6f5, 0xa6f8 }, /* 0x12678 = 0x12675 U+309A */
144: };
145:
146: static int
147: euc_jisx0213_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
148: {
149: int count = 0;
150: unsigned short lasttwo = conv->ostate;
151:
152: if (lasttwo) {
153: /* Attempt to combine the last character with this one. */
154: unsigned int idx;
155: unsigned int len;
156:
157: if (wc == 0x02e5)
158: idx = euc_jisx0213_comp_table02e5_idx,
159: len = euc_jisx0213_comp_table02e5_len;
160: else if (wc == 0x02e9)
161: idx = euc_jisx0213_comp_table02e9_idx,
162: len = euc_jisx0213_comp_table02e9_len;
163: else if (wc == 0x0300)
164: idx = euc_jisx0213_comp_table0300_idx,
165: len = euc_jisx0213_comp_table0300_len;
166: else if (wc == 0x0301)
167: idx = euc_jisx0213_comp_table0301_idx,
168: len = euc_jisx0213_comp_table0301_len;
169: else if (wc == 0x309a)
170: idx = euc_jisx0213_comp_table309a_idx,
171: len = euc_jisx0213_comp_table309a_len;
172: else
173: goto not_combining;
174:
175: do
176: if (euc_jisx0213_comp_table_data[idx].base == lasttwo)
177: break;
178: while (++idx, --len > 0);
179:
180: if (len > 0) {
181: /* Output the combined character. */
182: if (n >= 2) {
183: lasttwo = euc_jisx0213_comp_table_data[idx].composed;
184: r[0] = (lasttwo >> 8) & 0xff;
185: r[1] = lasttwo & 0xff;
186: conv->ostate = 0;
187: return 2;
188: } else
189: return RET_TOOSMALL;
190: }
191:
192: not_combining:
193: /* Output the buffered character. */
194: if (n < 2)
195: return RET_TOOSMALL;
196: r[0] = (lasttwo >> 8) & 0xff;
197: r[1] = lasttwo & 0xff;
198: r += 2;
199: count = 2;
200: }
201:
202: if (wc < 0x80) {
203: /* Plain ASCII character. */
204: if (n > count) {
205: r[0] = (unsigned char) wc;
206: conv->ostate = 0;
207: return count+1;
208: } else
209: return RET_TOOSMALL;
210: } else if (wc >= 0xff61 && wc <= 0xff9f) {
211: /* Half-width katakana. */
212: if (n >= count+2) {
213: r[0] = 0x8e;
214: r[1] = wc - 0xfec0;
215: conv->ostate = 0;
216: return count+2;
217: } else
218: return RET_TOOSMALL;
219: } else {
220: unsigned short jch = ucs4_to_jisx0213(wc);
221: if (jch != 0) {
222: if (jch & 0x0080) {
223: /* A possible match in comp_table_data. We have to buffer it. */
224: /* We know it's a JISX 0213 plane 1 character. */
225: if (jch & 0x8000) abort();
226: conv->ostate = jch | 0x8080;
227: return count+0;
228: }
229: if (jch & 0x8000) {
230: /* JISX 0213 plane 2. */
231: if (n >= count+3) {
232: r[0] = 0x8f;
233: r[1] = (jch >> 8) | 0x80;
234: r[2] = (jch & 0xff) | 0x80;
235: conv->ostate = 0;
236: return count+3;
237: } else
238: return RET_TOOSMALL;
239: } else {
240: /* JISX 0213 plane 1. */
241: if (n >= count+2) {
242: r[0] = (jch >> 8) | 0x80;
243: r[1] = (jch & 0xff) | 0x80;
244: conv->ostate = 0;
245: return count+2;
246: } else
247: return RET_TOOSMALL;
248: }
249: }
250: return RET_ILUNI;
251: }
252: }
253:
254: static int
255: euc_jisx0213_reset (conv_t conv, unsigned char *r, int n)
256: {
257: state_t lasttwo = conv->ostate;
258:
259: if (lasttwo) {
260: if (n < 2)
261: return RET_TOOSMALL;
262: r[0] = (lasttwo >> 8) & 0xff;
263: r[1] = lasttwo & 0xff;
264: /* conv->ostate = 0; will be done by the caller */
265: return 2;
266: } else
267: return 0;
268: }
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