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1 office 1 /*
2 * Copyright (C) 2001, 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 * DEC-HANYU
23 */
24  
25 static int
26 dec_hanyu_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
27 {
28 unsigned char c = *s;
29 /* Code set 0 (ASCII) */
30 if (c < 0x80)
31 return ascii_mbtowc(conv,pwc,s,n);
32 /* Code set 1 (CNS 11643-1992 Plane 1),
33 Code set 2 (CNS 11643-1992 Plane 2),
34 Code set 3 (CNS 11643-1992 Plane 3) */
35 if (c >= 0xa1 && c < 0xff) {
36 if (n < 2)
37 return RET_TOOFEW(0);
38 {
39 unsigned char c2 = s[1];
40 if (c == 0xc2 && c2 == 0xcb) {
41 if (n < 4)
42 return RET_TOOFEW(0);
43 if (s[2] >= 0xa1 && s[2] < 0xff && s[3] >= 0xa1 && s[3] < 0xff) {
44 unsigned char buf[2];
45 int ret;
46 buf[0] = s[2]-0x80; buf[1] = s[3]-0x80;
47 ret = cns11643_3_mbtowc(conv,pwc,buf,2);
48 if (ret != RET_ILSEQ) {
49 if (ret != 2) abort();
50 return 4;
51 }
52 }
53 } else if (c2 >= 0xa1 && c2 < 0xff) {
54 if (c != 0xc2 || c2 < 0xc2) {
55 unsigned char buf[2];
56 buf[0] = c-0x80; buf[1] = c2-0x80;
57 return cns11643_1_mbtowc(conv,pwc,buf,2);
58 }
59 } else if (c2 >= 0x21 && c2 < 0x7f) {
60 unsigned char buf[2];
61 buf[0] = c-0x80; buf[1] = c2;
62 return cns11643_2_mbtowc(conv,pwc,buf,2);
63 }
64 }
65 }
66 return RET_ILSEQ;
67 }
68  
69 static int
70 dec_hanyu_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
71 {
72 unsigned char buf[3];
73 int ret;
74  
75 /* Code set 0 (ASCII) */
76 ret = ascii_wctomb(conv,r,wc,n);
77 if (ret != RET_ILUNI)
78 return ret;
79  
80 ret = cns11643_wctomb(conv,buf,wc,3);
81 if (ret != RET_ILUNI) {
82 if (ret != 3) abort();
83  
84 /* Code set 1 (CNS 11643-1992 Plane 1) */
85 if (buf[0] == 1 && (buf[1] != 0x42 || buf[2] < 0x42)) {
86 if (n < 2)
87 return RET_TOOSMALL;
88 r[0] = buf[1]+0x80;
89 r[1] = buf[2]+0x80;
90 return 2;
91 }
92  
93 /* Code set 2 (CNS 11643-1992 Plane 2) */
94 if (buf[0] == 2) {
95 if (n < 2)
96 return RET_TOOSMALL;
97 r[0] = buf[1]+0x80;
98 r[1] = buf[2];
99 return 2;
100 }
101  
102 /* Code set 3 (CNS 11643-1992 Plane 3) */
103 if (buf[0] == 3) {
104 if (n < 4)
105 return RET_TOOSMALL;
106 r[0] = 0xc2;
107 r[1] = 0xcb;
108 r[2] = buf[1]+0x80;
109 r[3] = buf[2]+0x80;
110 return 4;
111 }
112 }
113  
114 return RET_ILUNI;
115 }