88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* 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 these libraries and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/*
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*+SNOTICE
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*
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*
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* $XConsortium: ObjectKey.C /main/4 1996/04/21 19:48:43 drk $
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*
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* RESTRICTED CONFIDENTIAL INFORMATION:
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*
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* The information in this document is subject to special
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* restrictions in a confidential disclosure agreement bertween
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* HP, IBM, Sun, USL, SCO and Univel. Do not distribute this
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* document outside HP, IBM, Sun, USL, SCO, or Univel wihtout
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* Sun's specific written approval. This documment and all copies
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* and derivative works thereof must be returned or destroyed at
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* Sun's request.
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*
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* Copyright 1993 Sun Microsystems, Inc. All rights reserved.
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*
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*+ENOTICE
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*/
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#include <assert.h>
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#include <string.h>
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#include <DtMail/ObjectKey.hh>
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ObjectKey::ObjectKey(ObjectKeyType type)
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{
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_type = strdup(type);
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return;
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}
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ObjectKey::ObjectKey(ObjectKey & key)
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{
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_type = strdup(key._type);
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}
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ObjectKey::~ObjectKey(void)
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{
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delete _type;
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}
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HashVal
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ObjectKey::genericHashValue(void * buf, int len)
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{
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short * sbuf = (short *)buf;
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int slen = len / 2;
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HashVal hash = 0;
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// Sum the bytes, 2 at a time. We will deal with fractional
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// stuff after we do the main buffer.
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//
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for (int cur = 0; cur < slen; cur++) {
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hash ^= sbuf[cur];
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}
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// If the length is not even, then we need to add the last
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// byte to the high order bits of the hash value.
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//
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if ((len % 2)) {
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hash ^= ((char *)buf)[len - 1] << 8;
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}
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if (hash < 0) hash = -hash;
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return(hash);
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}
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