blob: 5c74258ef8daaff9ae4d9e43ea6f62a9c5299bfd (
plain)
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
|
#include <stdlib.h>
#include <string.h>
#include "decoder.h"
namespace JinEngine
{
namespace Graphics
{
namespace Fonts
{
/* utf8 byte string to unicode codepoint */
static const char *utf8toCodepoint(const char *p, unsigned *res) {
return nullptr;
}
/////////////////////////////////////////////////////////////////////////////
// decoders
/////////////////////////////////////////////////////////////////////////////
const void* Utf8::decode(const void* data, Codepoint* res) const
{
const char* p = (char*)data;
unsigned x, mask, shift;
switch (*p & 0xf0) {
case 0xf0: mask = 0x07; shift = 18; break;
case 0xe0: mask = 0x0f; shift = 12; break;
case 0xc0:
case 0xd0: mask = 0x1f; shift = 6; break;
default:
*res = *p;
return p + 1;
}
x = (*p & mask) << shift;
do {
if (*(++p) == '\0') {
*res = x;
return p;
}
shift -= 6;
x |= (*p & 0x3f) << shift;
} while (shift);
*res = x;
return p + 1;
}
const void* Utf8::next(const void* data) const
{
const char* p = (char*)data;
unsigned x, mask, shift;
switch (*p & 0xf0) {
case 0xf0: mask = 0x07; shift = 18; break;
case 0xe0: mask = 0x0f; shift = 12; break;
case 0xc0:
case 0xd0: mask = 0x1f; shift = 6; break;
default:
return p + 1;
}
x = (*p & mask) << shift;
do {
if (*(++p) == '\0') {
return p;
}
shift -= 6;
x |= (*p & 0x3f) << shift;
} while (shift);
return p + 1;
}
/*
const void* Utf16::decode(const void* data, Codepoint* res) const
{
return nullptr;
}
const void* Utf16::next(const void* data) const
{
return nullptr;
}
*/
const void* Ascii::decode(const void* data, Codepoint* res) const
{
const char* p = (char*)data;
*res = *p;
return p + 1;
}
const void* Ascii::next(const void* data) const
{
const char* p = (char*)data;
return p + 1;
}
} // namespace Fonts
} // namespace Graphics
} // namespace JinEngine
|
