gecko/xpcom/glue/nsTHashtable.cpp

136 lines
3.5 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is C++ hashtable templates.
*
* The Initial Developer of the Original Code is
* Benjamin Smedberg.
* Portions created by the Initial Developer are Copyright (C) 2002
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsTHashtable.h"
#include "nsHashKeys.h"
#include "prbit.h"
PRUint32
HashString( const nsAString& aStr )
{
PRUint32 code = 0;
#ifdef MOZILLA_INTERNAL_API
nsAString::const_iterator begin, end;
aStr.BeginReading(begin);
aStr.EndReading(end);
#else
const PRUnichar *begin, *end;
PRUint32 len = NS_StringGetData(aStr, &begin);
end = begin + len;
#endif
while (begin != end) {
code = PR_ROTATE_LEFT32(code, 4) ^ PRUint32(*begin);
++begin;
}
return code;
}
PRUint32
HashString( const nsACString& aStr )
{
PRUint32 code = 0;
#ifdef MOZILLA_INTERNAL_API
nsACString::const_iterator begin, end;
aStr.BeginReading(begin);
aStr.EndReading(end);
#else
const char *begin, *end;
PRUint32 len = NS_CStringGetData(aStr, &begin);
end = begin + len;
#endif
while (begin != end) {
code = PR_ROTATE_LEFT32(code, 4) ^ PRUint32(*begin);
++begin;
}
return code;
}
PRUint32
HashString(const char *str)
{
PRUint32 code = 0;
while (*str) {
code = PR_ROTATE_LEFT32(code, 4) ^ PRUint32(*str);
++str;
}
return code;
}
PRUint32
HashString(const PRUnichar *str)
{
PRUint32 code = 0;
while (*str) {
code = PR_ROTATE_LEFT32(code, 4) ^ PRUint32(*str);
++str;
}
return code;
}
PLDHashOperator
PL_DHashStubEnumRemove(PLDHashTable *table,
PLDHashEntryHdr *entry,
PRUint32 ordinal,
void *userarg)
{
return PL_DHASH_REMOVE;
}
PRUint32 nsIDHashKey::HashKey(const nsID* id)
{
PRUint32 h = id->m0;
PRUint32 i;
h = PR_ROTATE_LEFT32(h, 4) ^ id->m1;
h = PR_ROTATE_LEFT32(h, 4) ^ id->m2;
for (i = 0; i < 8; i++)
h = PR_ROTATE_LEFT32(h, 4) ^ id->m3[i];
return h;
}