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Modified UTF-8 與 UTF-32 相互轉換

自己的實現，經過一定的測試。

頭文件

/*
2

Convert Modified UTF-8 <==> UTF-32.
3

*/
4

/*
7

function : Convert Modified UTF-8 to UTF-32.
8

input : str_mutf8, a null terminated string in Modified UTF-8.
9

output : str_utf32, a null terminated string in UTF-32.
10

input : str_utf32_limit, the max length(character count)
11

of str_utf32 plus one(for 'null'), str_utf32 must have enough space
12

for str_utf32_limit characters.
13

return : -1 for errors;
14

else the length(character count) of str_utf32,
15

maybe larger than (str_utf32_limit-1) if the space
16

of str_utf32 isn't enougn.
17

note : convert 0xc080 to U+0000 字符串未結束
18

convert 0x00 to U+0000 字符串結束
19

*/
20

int mutf8_to_utf32( const unsigned char *str_mutf8,
21

unsigned int *str_utf32, int str_utf32_limit );
22

/*
24

function : Convert UTF-32 to Modified UTF-8.
25

input : str_utf32, a null terminated string in UTF-32.
26

output : str_mutf8, a null terminated string in Modified UTF-8.
27

input : str_mutf8_limit, the max length(byte count)
28

of str_mutf8 plus one(for 'null'), str_mutf8 must have enough space
29

for str_mutf8_limit bytes.
30

return : -1 for errors;
31

else the length(byte count) of str_mutf8,
32

maybe larger than (str_mutf8_limit-1) if the space
33

of str_mutf8 isn't enougn.
34

note : convet U+0000 to 0x00, not 0xc080 字符串結束
35

*/
36

int utf32_to_mutf8( const unsigned int *str_utf32,
37

unsigned char *str_mutf8, int str_mutf8_limit );
38

C代碼

/*
2

Convert Modified UTF-8 <==> UTF-32.
3

*/
4

#include "cvt_mutf8_utf32.h"
7

#include <stdio.h>
8

/*
11

A U+0001 to U+007F
12

0+++ ++++ u &0x80 => 0x00
13

B U+0080 to U+07FF, and null character (U+0000)
15

110+ ++++ u &0xe0 => 0xc0
16

10++ ++++ v &0xc0 => 0x80
17

((u & 0x1f) << 6) + (v & 0x3f)
18

C U+0800 to U+FFFF
20

1110 ++++ u &0xf0 => 0xe0
21

10++ ++++ v &0xc0 => 0x80
22

10++ ++++ w &0xc0 => 0x80
23

((u & 0xf) << 12) + ((v & 0x3f) << 6) + (w & 0x3f)
24

D above U+FFFF (U+10000 to U+10FFFF)
26

1110 1101 u &0xff => 0xed
27

1010 ++++ v &0xf0 => 0xa0
28

10++ ++++ w &0xc0 => 0x80
29

1110 1101 x &0xff => 0xed
30

1011 ++++ y &0xf0 => 0xb0
31

10++ ++++ z &0xc0 => 0x80
32

0x10000+((v&0x0f)<<16)+((w&0x3f)<<10)+(y&0x0f)<<6)+(z&0x3f)
33

*/
34

int mutf8_to_utf32( const unsigned char *str_mutf8,
36

unsigned int *str_utf32, int str_utf32_limit ) {
37

unsigned int cod, u, v, w, x, y, z;
38

int len32 = 0;
39

if ( (NULL == str_mutf8) || (0 > str_utf32_limit) ) {
40

return (-1);
41

}
42

#define __ADD_UTF32_COD_Z__ do {\
44

if ( (NULL != str_utf32) && (len32 < str_utf32_limit) ) {\
45

str_utf32[ len32 ] = cod;\
46

}\
47

++len32;\
48

} while ( 0 )
49

for ( ; ; ) {
51

u = *str_mutf8++;
52

if ( 0 == u ) {
54

break;
55

}
56

if ( 0x00 == (0x80 & u) ) {
58

cod = u;
59

__ADD_UTF32_COD_Z__;
60

continue;
61

}
62

if ( 0xc0 == (0xe0 & u) ) {
64

v = *str_mutf8++;
65

if ( 0x80 != (0xc0 & v) ) {
66

return (-1);
67

}
68

cod = ((u&0x1f)<<6) |
69

(v&0x3f);
70

__ADD_UTF32_COD_Z__;
71

continue;
72

}
73

if ( 0xe0 == (0xf0 & u) ) {
75

v = *str_mutf8++;
76

if ( 0x80 != (0xc0 & v) ) {
77

return (-1);
78

}
79

w = *str_mutf8++;
80

if ( 0x80 != (0xc0 & w) ) {
81

return (-1);
82

}
83

if ( (0xed == (0xff & u)) &&
84

(0xa0 == (0xf0 & v)) &&
85

(0x80 == (0xc0 & w))
86

) {
87

x = *str_mutf8++;
88

if ( 0xed != (0xff & x) ) {
89

return (-1);
90

}
91

y = *str_mutf8++;
92

if ( 0xb0 != (0xf0 & y) ) {
93

return (-1);
94

}
95

z = *str_mutf8++;
96

if ( 0x80 != (0xc0 & z) ) {
97

return (-1);
98

}
99

cod = 0x10000 + (
100

((v&0x0f)<<16) |
101

((w&0x3f)<<10) |
102

((y&0x0f)<<6) |
103

(z&0x3f) );
104

__ADD_UTF32_COD_Z__;
105

continue;
106

}
107

cod = ((u&0xf)<<12) |
108

((v&0x3f)<<6) |
109

(w&0x3f);
110

__ADD_UTF32_COD_Z__;
111

continue;
112

}
113

114

return (-1);
115

}
116

117

if ( NULL == str_utf32 ) {
118

}
119

else if ( len32 < str_utf32_limit ) {
120

str_utf32[ len32 ] = 0;
121

}
122

else {
123

str_utf32[ str_utf32_limit-1 ] = 0;
124

}
125

126

return len32;
127

#undef __ADD_UTF32_COD_Z__
128

}
129

130

int utf32_to_mutf8( const unsigned int *str_utf32,
131

unsigned char *str_mutf8, int str_mutf8_limit ) {
132

unsigned int cod;
133

int len8 = 0;
134

if ( (NULL == str_utf32) || (0 > str_mutf8_limit) ) {
135

return (-1);
136

}
137

138

#define __ADD_MUTF8_B_Z__(b) do {\
139

if ( (NULL != str_mutf8) && (len8 < str_mutf8_limit) ) {\
140

str_mutf8[ len8 ] = (unsigned char)(b);\
141

}\
142

++len8;\
143

} while ( 0 )
144

145

for ( ; ; ) {
146

cod = *str_utf32++;
147

148

if ( 0 == cod ) {
149

break;
150

}
151

152

if ( 0x007f >= cod ) {
153

__ADD_MUTF8_B_Z__(cod);
154

continue;
155

}
156

157

if ( 0x07ff >= cod ) {
158

__ADD_MUTF8_B_Z__(0xc0|((cod>>6)&0x1f));
159

__ADD_MUTF8_B_Z__(0x80|(cod&0x3f));
160

continue;
161

}
162

163

if ( 0xffff >= cod ) {
164

__ADD_MUTF8_B_Z__(0xe0|((cod>>12)&0x0f));
165

__ADD_MUTF8_B_Z__(0x80|((cod>>6)&0x3f));
166

__ADD_MUTF8_B_Z__(0x80|(cod&0x3f));
167

continue;
168

}
169

170

if ( 0x10ffff >= cod ) {
171

cod -= 0x10000;
172

__ADD_MUTF8_B_Z__(0xed);
173

__ADD_MUTF8_B_Z__(0xa0|((cod>>16)&0x0f));
174

__ADD_MUTF8_B_Z__(0x80|((cod>>10)&0x3f));
175

__ADD_MUTF8_B_Z__(0xed);
176

__ADD_MUTF8_B_Z__(0xb0|((cod>>6)&0x0f));
177

__ADD_MUTF8_B_Z__(0x80|(cod&0x3f));
178

continue;
179

}
180

181

return (-1);
182

}
183

184

if ( NULL == str_mutf8 ) {
185

}
186

else if ( len8 < str_mutf8_limit ) {
187

str_mutf8[ len8 ] = 0;
188

}
189

else {
190

str_mutf8[ str_mutf8_limit-1 ] = 0;
191

}
192

193

return len8;
194

#undef __ADD_MUTF8_B_Z__
195

}
196

197

posted on 2014-04-13 19:42 coreBugZJ 閱讀(999) 評論(0) 編輯收藏引用所屬分類: 技術視野

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Modified UTF-8 與 UTF-32 相互轉換