1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/*
* Copyright (C) 1999-2001, 2008 Free Software Foundation, Inc.
* This file is part of the GNU LIBICONV Library.
*
* The GNU LIBICONV Library is free software; you can redistribute it
* and/or modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* The GNU LIBICONV Library is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with the GNU LIBICONV Library; see the file COPYING.LIB.
* If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/*
* HZ
*/
/* Specification: RFC 1842, RFC 1843 */
/*
* The state is 1 in GB mode, 0 in ASCII mode.
*/
static int
hz_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
{
state_t state = conv->istate;
unsigned int count = 0;
unsigned char c;
for (;;) {
c = *s;
if (c == '~') {
if (n < count+2)
goto none;
c = s[1];
if (state == 0) {
if (c == '~') {
*pwc = (ucs4_t) '~';
conv->istate = state;
return count+2;
}
if (c == '{') {
state = 1;
s += 2; count += 2;
if (n < count+1)
goto none;
continue;
}
if (c == '\n') {
s += 2; count += 2;
if (n < count+1)
goto none;
continue;
}
} else {
if (c == '}') {
state = 0;
s += 2; count += 2;
if (n < count+1)
goto none;
continue;
}
}
goto ilseq;
}
break;
}
if (state == 0) {
*pwc = (ucs4_t) c;
conv->istate = state;
return count+1;
} else {
int ret;
if (n < count+2)
goto none;
ret = gb2312_mbtowc(conv,pwc,s,2);
if (ret == RET_ILSEQ)
goto ilseq;
if (ret != 2) abort();
conv->istate = state;
return count+2;
}
none:
conv->istate = state;
return RET_TOOFEW(count);
ilseq:
conv->istate = state;
return RET_SHIFT_ILSEQ(count);
}
static int
hz_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
{
state_t state = conv->ostate;
unsigned char buf[2];
int ret;
/* Code set 0 (ASCII or GB 1988-89) */
ret = ascii_wctomb(conv,buf,wc,1);
if (ret != RET_ILUNI) {
if (ret != 1) abort();
if (buf[0] < 0x80) {
int count = (state ? 3 : 1);
if (n < count)
return RET_TOOSMALL;
if (state) {
r[0] = '~';
r[1] = '}';
r += 2;
state = 0;
}
r[0] = buf[0];
conv->ostate = state;
return count;
}
}
/* Code set 1 (GB 2312-1980) */
ret = gb2312_wctomb(conv,buf,wc,2);
if (ret != RET_ILUNI) {
if (ret != 2) abort();
if (buf[0] < 0x80 && buf[1] < 0x80) {
int count = (state ? 2 : 4);
if (n < count)
return RET_TOOSMALL;
if (!state) {
r[0] = '~';
r[1] = '{';
r += 2;
state = 1;
}
r[0] = buf[0];
r[1] = buf[1];
conv->ostate = state;
return count;
}
}
return RET_ILUNI;
}
static int
hz_reset (conv_t conv, unsigned char *r, int n)
{
state_t state = conv->ostate;
if (state) {
if (n < 2)
return RET_TOOSMALL;
r[0] = '~';
r[1] = '}';
/* conv->ostate = 0; will be done by the caller */
return 2;
} else
return 0;
}
|
