/usr/src/openvswitch-1.4.0/lib/unicode.c is in openvswitch-datapath-dkms 1.4.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | /*
* Copyright (c) 2009, 2010 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "unicode.h"
#include <inttypes.h>
#include "dynamic-string.h"
#include "util.h"
/* Returns the unicode code point corresponding to leading surrogate 'leading'
* and trailing surrogate 'trailing'. The return value will not make any
* sense if 'leading' or 'trailing' are not in the correct ranges for leading
* or trailing surrogates. */
int
utf16_decode_surrogate_pair(int leading, int trailing)
{
/*
* Leading surrogate: 110110wwwwxxxxxx
* Trailing surrogate: 110111xxxxxxxxxx
* Code point: 000uuuuuxxxxxxxxxxxxxxxx
*/
int w = (leading >> 6) & 0xf;
int u = w + 1;
int x0 = leading & 0x3f;
int x1 = trailing & 0x3ff;
return (u << 16) | (x0 << 10) | x1;
}
/* Returns the number of Unicode characters in UTF-8 string 's'. */
size_t
utf8_length(const char *s_)
{
const uint8_t *s;
size_t length;
length = 0;
for (s = (const uint8_t *) s_; *s != '\0'; s++) {
/* The most-significant bits of the first byte in a character are one
* of 2#01, 2#00, or 2#11. 2#10 is a continuation byte. */
length += (*s & 0xc0) != 0x80;
}
return length;
}
static char *
invalid_utf8_sequence(const uint8_t *s, int n, size_t *lengthp)
{
struct ds msg;
int i;
if (lengthp) {
*lengthp = 0;
}
ds_init(&msg);
ds_put_cstr(&msg, "invalid UTF-8 sequence");
for (i = 0; i < n; i++) {
ds_put_format(&msg, " 0x%02"PRIx8, s[i]);
}
return ds_steal_cstr(&msg);
}
struct utf8_sequence {
uint8_t octets[5][2];
};
static const struct utf8_sequence *
lookup_utf8_sequence(uint8_t c)
{
static const struct utf8_sequence seqs[] = {
{ { { 0x01, 0x7f },
{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } } },
{ { { 0xc2, 0xdf }, { 0x80, 0xbf },
{ 0, 0 }, { 0, 0 }, { 0, 0 } } },
{ { { 0xe0, 0xe0 }, { 0xa0, 0xbf }, { 0x80, 0xbf },
{0,0}, {0, 0 } } },
{ { { 0xe1, 0xec }, { 0x80, 0xbf }, { 0x80, 0xbf },
{ 0, 0 }, { 0, 0 } } },
{ { { 0xed, 0xed }, { 0x80, 0x9f }, { 0x80, 0xbf },
{ 0, 0 }, { 0, 0 } } },
{ { { 0xee, 0xef }, { 0x80, 0xbf }, { 0x80, 0xbf },
{ 0, 0 }, { 0, 0 } } },
{ { { 0xf0, 0xf0 }, { 0x90, 0xbf }, { 0x80, 0xbf }, { 0x80, 0xbf },
{ 0, 0 } } },
{ { { 0xf1, 0xf3 }, { 0x80, 0xbf }, { 0x80, 0xbf }, { 0x80, 0xbf },
{ 0, 0 } } },
{ { { 0xf4, 0xf4 }, { 0x80, 0x8f }, { 0x80, 0xbf }, { 0x80, 0xbf },
{ 0, 0 } } },
};
size_t i;
for (i = 0; i < ARRAY_SIZE(seqs); i++) {
const uint8_t *o = seqs[i].octets[0];
if (c >= o[0] && c <= o[1]) {
return &seqs[i];
}
}
return NULL;
}
/* Checks that 's' is a valid, null-terminated UTF-8 string. If so, returns a
* null pointer and sets '*lengthp' to the number of Unicode characters in
* 's'. If not, returns an error message that the caller must free and sets
* '*lengthp' to 0.
*
* 'lengthp' may be NULL if the length is not needed. */
char *
utf8_validate(const char *s_, size_t *lengthp)
{
size_t length = 0;
const uint8_t *s;
for (s = (const uint8_t *) s_; *s != '\0'; ) {
length++;
if (s[0] < 0x80) {
s++;
} else {
const struct utf8_sequence *seq;
int i;
seq = lookup_utf8_sequence(s[0]);
if (!seq) {
return invalid_utf8_sequence(s, 1, lengthp);
}
for (i = 1; seq->octets[i][0]; i++) {
const uint8_t *o = seq->octets[i];
if (s[i] < o[0] || s[i] > o[1]) {
return invalid_utf8_sequence(s, i + 1, lengthp);
}
}
s += i;
}
}
if (lengthp) {
*lengthp = length;
}
return NULL;
}
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