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https://github.com/ceph/ceph
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dc48f25847
git-svn-id: https://ceph.svn.sf.net/svnroot/ceph@2100 29311d96-e01e-0410-9327-a35deaab8ce9
48 lines
1.0 KiB
C++
48 lines
1.0 KiB
C++
// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
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/*
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* Ceph - scalable distributed file system
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*
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* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
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*
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* This is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License version 2.1, as published by the Free Software
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* Foundation. See file COPYING.
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*
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*/
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#ifndef __BLOBHASH_H
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#define __BLOBHASH_H
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#include "hash.h"
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/*
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- this is to make some of the STL types work with 64 bit values, string hash keys, etc.
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- added when i was using an old STL.. maybe try taking these out and see if things
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compile now?
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*/
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class blobhash {
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public:
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size_t operator()(const char *p, unsigned len) {
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static rjhash<size_t> H;
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size_t acc = 0;
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while (len >= sizeof(size_t)) {
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acc ^= *(size_t*)p;
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p += sizeof(size_t);
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len -= sizeof(size_t);
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}
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int sh = 0;
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while (len) {
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acc ^= (size_t)*p << sh;
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sh += 8;
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len--;
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p++;
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}
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return H(acc);
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}
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};
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#endif
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