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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#ifndef CEPH_BLOBHASH_H
#define CEPH_BLOBHASH_H
#include "hash.h"
/*
- this is to make some of the STL types work with 64 bit values, string hash keys, etc.
- added when i was using an old STL.. maybe try taking these out and see if things
compile now?
*/
class blobhash {
public:
uint32_t operator()(const char *p, unsigned len) {
static rjhash<uint32_t> H;
uint32_t acc = 0;
while (len >= sizeof(acc)) {
acc ^= *(uint32_t*)p;
p += sizeof(uint32_t);
len -= sizeof(uint32_t);
}
int sh = 0;
while (len) {
acc ^= (uint32_t)*p << sh;
sh += 8;
len--;
p++;
}
return H(acc);
}
};
#endif
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