78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
/*
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* This file is part of the Sofia-SIP package
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*
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* Copyright (C) 2005 Nokia Corporation.
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*
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* Contact: Pekka Pessi <pekka.pessi@nokia.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#ifndef MSG_MCLASS_HASH_H
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/** Defined when <sofia-sip/msg_mclass_hash.h> has been included. */
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#define MSG_MCLASS_HASH_H
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/**@ingroup msg_parser
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* @file sofia-sip/msg_mclass_hash.h
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*
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* Hash function for header names.
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*
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* @author Pekka Pessi <Pekka.Pessi@nokia.com>
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*
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* @date Created: Tue Aug 21 16:03:45 2001 ppessi
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*
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*/
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#include <sofia-sip/su_config.h>
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#ifndef BNF_H
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#include <sofia-sip/bnf.h>
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#endif
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SOFIA_BEGIN_DECLS
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/** Hash the header name */
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#define MC_HASH(s, n) (msg_header_name_hash(s, NULL) % (unsigned)(n))
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/** Hash header name */
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su_inline
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unsigned short msg_header_name_hash(char const *s, isize_t *llen)
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{
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unsigned short hash = 0;
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size_t i;
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for (i = 0; s[i]; i++) {
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unsigned char c = s[i];
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if (!(_bnf_table[c] & bnf_token))
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break;
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if (c >= 'A' && c <= 'Z')
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hash += (c + 'a' - 'A');
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else
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hash += c;
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hash *= 38501U;
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}
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if (llen)
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*llen = i;
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return hash;
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}
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SOFIA_END_DECLS
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#endif /** MSG_MCLASS_HASH_H */
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