This file is indexed.

/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;
}