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
|
/*
* MIT License
*
* Copyright (c) 2019 Yibo Cai
* Copyright (c) 2019 Vsevolod Stakhov
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "fastutf8.h"
#include "libcryptobox/platform_config.h"
/*
* http://www.unicode.org/versions/Unicode6.0.0/ch03.pdf - page 94
*
* Table 3-7. Well-Formed UTF-8 Byte Sequences
*
* +--------------------+------------+-------------+------------+-------------+
* | Code Points | First Byte | Second Byte | Third Byte | Fourth Byte |
* +--------------------+------------+-------------+------------+-------------+
* | U+0000..U+007F | 00..7F | | | |
* +--------------------+------------+-------------+------------+-------------+
* | U+0080..U+07FF | C2..DF | 80..BF | | |
* +--------------------+------------+-------------+------------+-------------+
* | U+0800..U+0FFF | E0 | A0..BF | 80..BF | |
* +--------------------+------------+-------------+------------+-------------+
* | U+1000..U+CFFF | E1..EC | 80..BF | 80..BF | |
* +--------------------+------------+-------------+------------+-------------+
* | U+D000..U+D7FF | ED | 80..9F | 80..BF | |
* +--------------------+------------+-------------+------------+-------------+
* | U+E000..U+FFFF | EE..EF | 80..BF | 80..BF | |
* +--------------------+------------+-------------+------------+-------------+
* | U+10000..U+3FFFF | F0 | 90..BF | 80..BF | 80..BF |
* +--------------------+------------+-------------+------------+-------------+
* | U+40000..U+FFFFF | F1..F3 | 80..BF | 80..BF | 80..BF |
* +--------------------+------------+-------------+------------+-------------+
* | U+100000..U+10FFFF | F4 | 80..8F | 80..BF | 80..BF |
* +--------------------+------------+-------------+------------+-------------+
*/
/* Return 0 - success, >0 - index (1 based) of first error char */
off_t
rspamd_fast_utf8_validate_ref (const unsigned char *data, size_t len)
{
off_t err_pos = 1;
while (len) {
int bytes;
const unsigned char byte1 = data[0];
/* 00..7F */
if (byte1 <= 0x7F) {
bytes = 1;
/* C2..DF, 80..BF */
}
else if (len >= 2 && byte1 >= 0xC2 && byte1 <= 0xDF &&
(signed char) data[1] <= (signed char) 0xBF) {
bytes = 2;
}
else if (len >= 3) {
const unsigned char byte2 = data[1];
/* Is byte2, byte3 between 0x80 ~ 0xBF */
const int byte2_ok = (signed char) byte2 <= (signed char) 0xBF;
const int byte3_ok = (signed char) data[2] <= (signed char) 0xBF;
if (byte2_ok && byte3_ok &&
/* E0, A0..BF, 80..BF */
((byte1 == 0xE0 && byte2 >= 0xA0) ||
/* E1..EC, 80..BF, 80..BF */
(byte1 >= 0xE1 && byte1 <= 0xEC) ||
/* ED, 80..9F, 80..BF */
(byte1 == 0xED && byte2 <= 0x9F) ||
/* EE..EF, 80..BF, 80..BF */
(byte1 >= 0xEE && byte1 <= 0xEF))) {
bytes = 3;
}
else if (len >= 4) {
/* Is byte4 between 0x80 ~ 0xBF */
const int byte4_ok = (signed char) data[3] <= (signed char) 0xBF;
if (byte2_ok && byte3_ok && byte4_ok &&
/* F0, 90..BF, 80..BF, 80..BF */
((byte1 == 0xF0 && byte2 >= 0x90) ||
/* F1..F3, 80..BF, 80..BF, 80..BF */
(byte1 >= 0xF1 && byte1 <= 0xF3) ||
/* F4, 80..8F, 80..BF, 80..BF */
(byte1 == 0xF4 && byte2 <= 0x8F))) {
bytes = 4;
}
else {
return err_pos;
}
}
else {
return err_pos;
}
}
else {
return err_pos;
}
len -= bytes;
err_pos += bytes;
data += bytes;
}
return 0;
}
/* Prototypes */
#if defined(HAVE_SSE41) && defined(__x86_64__)
extern off_t rspamd_fast_utf8_validate_sse41 (const unsigned char *data, size_t len);
#endif
#if defined(HAVE_AVX2) && defined(__x86_64__)
extern off_t rspamd_fast_utf8_validate_avx2 (const unsigned char *data, size_t len);
#endif
static off_t (*validate_func) (const unsigned char *data, size_t len) =
rspamd_fast_utf8_validate_ref;
void
rspamd_fast_utf8_library_init (unsigned flags)
{
#if defined(HAVE_SSE41) && defined(__x86_64__)
if (flags & RSPAMD_FAST_UTF8_FLAG_SSE41) {
validate_func = rspamd_fast_utf8_validate_sse41;
}
#endif
#if defined(HAVE_AVX2) && defined(__x86_64__)
if (flags & RSPAMD_FAST_UTF8_FLAG_AVX2) {
validate_func = rspamd_fast_utf8_validate_avx2;
}
#endif
}
off_t
rspamd_fast_utf8_validate (const unsigned char *data, size_t len)
{
return len >= 64 ?
validate_func (data, len) :
rspamd_fast_utf8_validate_ref (data, len);
}
|
