Dali 3D User Interface Engine
hash.cpp
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1 /*
2  * Copyright (c) 2015 Samsung Electronics Co., Ltd.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16  */
17 
18 // CLASS HEADER
20 
21 namespace Dali
22 {
23 
24 namespace //unnamed namespace
25 {
26 
27 /*
28  * djb2 (http://www.cse.yorku.ca/~oz/hash.html)
29  */
30 
31 inline void HashString( const char* string, std::size_t& hash )
32 {
33  while( int c = *string++ )
34  {
35  hash = hash * 33 + c;
36  }
37 }
38 
39 } // unnamed namespace
40 
41 std::size_t CalculateHash( const std::string& toHash)
42 {
43  std::size_t hash( INITIAL_HASH_VALUE );
44 
45  HashString( toHash.c_str(), hash );
46 
47  return hash;
48 }
49 
50 std::size_t CalculateHash( const std::string& string1, const std::string& string2 )
51 {
52  std::size_t hash( INITIAL_HASH_VALUE );
53 
54  HashString( string1.c_str(), hash);
55  HashString( string2.c_str(), hash );
56 
57  return hash;
58 }
59 
60 } // namespace Dali
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