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/* Copyright 2012 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#include "mongo/base/string_data.h"
#include <ostream>
#include <third_party/murmurhash3/MurmurHash3.h>
namespace mongo {
namespace {
template <int SizeofSizeT>
size_t murmur3(const StringData& str);
template <>
size_t murmur3<4>(const StringData& str) {
uint32_t hash;
MurmurHash3_x86_32(str.rawData(), str.size(), 0, &hash);
return hash;
}
template <>
size_t murmur3<8>(const StringData& str) {
uint64_t hash[2];
MurmurHash3_x64_128(str.rawData(), str.size(), 0, hash);
return static_cast<size_t>(hash[0]);
}
} // namespace
std::ostream& operator<<(std::ostream& stream, const StringData& value) {
return stream.write(value.rawData(), value.size());
}
size_t StringData::Hasher::operator() (const StringData& str) const {
return murmur3<sizeof(size_t)>(str);
}
} // namespace mongo
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