msg  1.12.11devel
msg_mclass_hash.h
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1 /*
2  * This file is part of the Sofia-SIP package
3  *
4  * Copyright (C) 2005 Nokia Corporation.
5  *
6  * Contact: Pekka Pessi <pekka.pessi@nokia-email.address.hidden>
7  *
8  * This library is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public License
10  * as published by the Free Software Foundation; either version 2.1 of
11  * the License, or (at your option) any later version.
12  *
13  * This library is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with this library; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
21  * 02110-1301 USA
22  *
23  */
24 
25 #ifndef MSG_MCLASS_HASH_H
27 #define MSG_MCLASS_HASH_H
28 
40 #include <sofia-sip/su_config.h>
41 
42 #ifndef BNF_H
43 #include <sofia-sip/bnf.h>
44 #endif
45 
46 SOFIA_BEGIN_DECLS
47 
49 #define MC_HASH(s, n) (msg_header_name_hash(s, NULL) % (unsigned)(n))
50 
53 unsigned short msg_header_name_hash(char const *s, isize_t *llen)
54 {
55  unsigned short hash = 0;
56  size_t i;
57 
58  for (i = 0; s[i]; i++) {
59  unsigned char c = s[i];
60  if (!(_bnf_table[c] & bnf_token))
61  break;
62  if (c >= 'A' && c <= 'Z')
63  hash += (c + 'a' - 'A');
64  else
65  hash += c;
66  hash *= 38501U;
67  }
68 
69  if (llen)
70  *llen = i;
71 
72  return hash;
73 }
74 
75 SOFIA_END_DECLS
76 
77 #endif
unsigned short msg_header_name_hash(char const *s, isize_t *llen)
Hash header name.
Definition: msg_mclass_hash.h:53
#define su_inline

Sofia-SIP 1.12.11devel - Copyright (C) 2006 Nokia Corporation. All rights reserved. Licensed under the terms of the GNU Lesser General Public License.