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
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/*
* VBSF - unix to DOS time conversion
* Copyright (C) 2022 Javier S. Pedro
*
* unicode.h: Unicode conversion routines
* Copyright (C) 2011-2022 Eduardo Casino
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program 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 General License for more details.
*
* You should have received a copy of the GNU General License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef UNICODE_H
#define UNICODE_H
#include <stdint.h>
#include "sftsr.h"
#ifdef __IN_SFTSR__
#define TSRDATAPTR PTSRDATA
#else
#define TSRDATAPTR LPTSRDATA
#endif
static inline uint8_t lookup_codepage( TSRDATAPTR data, uint16_t cp )
{
uint8_t i;
for ( i = 0; i < 128 && data->unicode_table[i] != cp; ++i );
return ( i < 128 ? (uint8_t) i + 128 : '\0' );
}
// dst and src CAN'T BE THE SAME !!!!
// Returns resulting length or -1 if buffer overflow
//
static uint16_t local_to_utf8_n( TSRDATAPTR data, uint8_t *dst, const char far *src, uint16_t buflen, uint16_t count )
{
uint16_t len = 0; // Resulting length
uint16_t cp; // Unicode Code Point
while ( *src && count )
{
// UTF-8 bytes: 0xxxxxxx
// Binary CP: 0xxxxxxx
// CP range: U+0000 to U+007F (Direct ASCII translation)
//
if ( ! (*src & 0x80) )
{
if ( buflen > len )
{
*dst++ = *src;
++len;
goto cont;
}
else
{
return -1;
}
}
cp = data->unicode_table[*src - 128];
// UTF-8 bytes: 110yyyyy 10xxxxxx
// Binary CP: 00000yyy yyxxxxxx
// CP range: U+0080 to U+07FF
//
if ( ! (cp & 0xF000) )
{
if ( buflen > len + 1 )
{
*dst++ = (uint8_t)( cp >> 6 ) | 0xC0;
*dst++ = (uint8_t)( cp & 0x3f ) | 0x80;
len += 2;
}
else
{
return -1;
}
}
// UTF-8 bytes: 1110zzzz 10yyyyyy 10xxxxxx
// Binary CP: zzzzyyyy yyxxxxxx
// CP range: U+0800 to U+FFFF
//
else
{
if ( buflen > len +2 )
{
*dst++ = (uint8_t)( cp >> 12 ) | 0xE0;
*dst++ = (uint8_t)( (cp >> 6) & 0x3F ) | 0x80;
*dst++ = (uint8_t)( cp & 0x3F ) | 0x80;
len += 3;
}
else
{
return -1;
}
}
cont:
++src, --count;
};
// Terminate string
//
*dst = '\0';
return len;
}
static inline uint16_t local_to_utf8( TSRDATAPTR data, uint8_t *dst, const char far *src, uint16_t buflen )
{
return local_to_utf8_n( data, dst, src, buflen, buflen );
}
// Returns true on success, false if any unsupported char is found
//
static bool utf8_to_local( TSRDATAPTR data, char *dst, char *src, uint16_t *len )
{
bool ret = true; // Return code
uint16_t cp; // Unicode Code point
uint16_t l = 0;
while ( *src )
{
// UTF-8 bytes: 0xxxxxxx
// Binary CP: 0xxxxxxx
// CP range: U+0000 to U+007F (Direct ASCII translation)
//
if ( ! (*src & 0x80) )
{
*dst = *src;
++src;
goto cont;
}
// UTF-8 bytes: 110yyyyy 10xxxxxx
// Binary CP: 00000yyy yyxxxxxx
// CP range: U+0080 to U+07FF
//
if ( ! (*src & 0x20) )
{
cp = ( (uint16_t)(*src & 0x1F) << 6 ) | *(src+1) & 0x3F;
*dst = lookup_codepage( data, cp );
if ( *dst == '\0' )
{
*dst = '_';
ret = false;
}
src += 2;
goto cont;
}
// UTF-8 bytes: 1110zzzz 10yyyyyy 10xxxxxx
// Binary CP: zzzzyyyy yyxxxxxx
// CP range: U+0800 to U+FFFF
//
if ( ! (*src & 0x10) )
{
cp = ( (uint16_t)(*src & 0xF) << 12 ) | ( (uint16_t)(*(src+1) & 0x3F) << 6 ) | *(src+2) & 0x3F;
*dst = lookup_codepage( data, cp );
if ( *dst == '\0' )
{
*dst = '_';
ret = false;
}
src += 3;
goto cont;
}
// UTF-8 bytes: 11110www 10zzzzzz 10yyyyyy 10xxxxxx
// Binary CP: 000wwwzz zzzzyyyy yyxxxxxx
// CP range: U+010000 to U+10FFFF
//
if ( ! (*src & 0x08) )
{
*dst = '_'; // Currently unsupported
ret = false;
src += 4;
goto cont;
}
// Should not reach here
//
*dst = '_';
ret = false;
++src;
cont:
++dst, ++l;
};
// Terminate string
//
*dst = '\0';
if (len) *len = l;
return ret;
}
#endif
|
