File: mime_header.cc

package info (click to toggle)
squid3 3.4.8-6+deb8u5
  • links: PTS
  • area: main
  • in suites: jessie
  • size: 32,116 kB
  • sloc: cpp: 165,380; ansic: 21,998; sh: 12,166; makefile: 5,974; perl: 2,153; sql: 322; awk: 118
file content (167 lines) | stat: -rw-r--r-- 4,199 bytes parent folder | download
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
165
166
167
/*
 * DEBUG: section 25    MiME Header Parsing
 * AUTHOR: Harvest Derived
 *
 * SQUID Web Proxy Cache          http://www.squid-cache.org/
 * ----------------------------------------------------------
 *
 *  Squid is the result of efforts by numerous individuals from
 *  the Internet community; see the CONTRIBUTORS file for full
 *  details.   Many organizations have provided support for Squid's
 *  development; see the SPONSORS file for full details.  Squid is
 *  Copyrighted (C) 2001 by the Regents of the University of
 *  California; see the COPYRIGHT file for full details.  Squid
 *  incorporates software developed and/or copyrighted by other
 *  sources; see the CREDITS file for full details.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 */

#include "squid.h"

#define GET_HDR_SZ 1024
#include "Debug.h"
#include "profiler/Profiler.h"

/*
 * returns a pointer to a field-value of the first matching field-name where
 * field-value matches prefix if any
 */
char *
mime_get_header_field(const char *mime, const char *name, const char *prefix)
{
    LOCAL_ARRAY(char, header, GET_HDR_SZ);
    const char *p = NULL;
    char *q = NULL;
    char got = 0;
    const int namelen = name ? strlen(name) : 0;
    const int preflen = prefix ? strlen(prefix) : 0;
    int l;

    if (NULL == mime)
        return NULL;

    assert(NULL != name);

    debugs(25, 5, "mime_get_header: looking for '" << name << "'");

    for (p = mime; *p; p += strcspn(p, "\n")) {
        if (strcmp(p, "\n\r\n") == 0 || strcmp(p, "\n\n") == 0)
            return NULL;

        if (*p == '\n')
            ++p;

        if (strncasecmp(p, name, namelen))
            continue;

        if (!xisspace(p[namelen]) && p[namelen] != ':')
            continue;

        l = strcspn(p, "\n\r") + 1;

        if (l > GET_HDR_SZ)
            l = GET_HDR_SZ;

        xstrncpy(header, p, l);

        debugs(25, 5, "mime_get_header: checking '" << header << "'");

        q = header;

        q += namelen;

        if (*q == ':') {
            ++q;
            got = 1;
        }

        while (xisspace(*q)) {
            ++q;
            got = 1;
        }

        if (got && prefix) {
            /* we could process list entries here if we had strcasestr(). */
            /* make sure we did not match a part of another field-value */
            got = !strncasecmp(q, prefix, preflen) && !xisalpha(q[preflen]);
        }

        if (got) {
            debugs(25, 5, "mime_get_header: returning '" << q << "'");
            return q;
        }
    }

    return NULL;
}

/* returns a pointer to a field-value of the first matching field-name */
char *
mime_get_header(const char *mime, const char *name)
{
    return mime_get_header_field(mime, name, NULL);
}

size_t
headersEnd(const char *mime, size_t l)
{
    size_t e = 0;
    int state = 1;

    PROF_start(headersEnd);

    while (e < l && state < 3) {
        switch (state) {

        case 0:

            if ('\n' == mime[e])
                state = 1;

            break;

        case 1:
            if ('\r' == mime[e])
                state = 2;
            else if ('\n' == mime[e])
                state = 3;
            else
                state = 0;

            break;

        case 2:
            if ('\n' == mime[e])
                state = 3;
            else
                state = 0;

            break;

        default:
            break;
        }

        ++e;
    }
    PROF_stop(headersEnd);

    if (3 == state)
        return e;

    return 0;
}