Page Speed Optimization Libraries  1.2.24.1
net/instaweb/util/public/hasher.h
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00001 /*
00002  * Copyright 2010 Google Inc.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http:///www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00020 
00021 #ifndef NET_INSTAWEB_UTIL_PUBLIC_HASHER_H_
00022 #define NET_INSTAWEB_UTIL_PUBLIC_HASHER_H_
00023 
00024 #include "net/instaweb/util/public/basictypes.h"
00025 #include "net/instaweb/util/public/string.h"
00026 #include "net/instaweb/util/public/string_util.h"
00027 
00028 namespace net_instaweb {
00029 
00030 class Hasher {
00031  public:
00034   explicit Hasher(int max_chars);
00035   virtual ~Hasher();
00036 
00042   GoogleString Hash(const StringPiece& content) const;
00043 
00049   int HashSizeInChars() const;
00050 
00052   uint64 HashToUint64(const StringPiece& content) const;
00053 
00057   virtual GoogleString RawHash(const StringPiece& content) const = 0;
00058 
00060   virtual int RawHashSizeInBytes() const = 0;
00061 
00062  private:
00063   int max_chars_; 
00064 
00065   DISALLOW_COPY_AND_ASSIGN(Hasher);
00066 };
00067 
00068 }  
00069 
00070 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_HASHER_H_
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