Page Speed Optimization Libraries
1.3.25.1
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00001 /* 00002 * Copyright 2011 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 00018 00019 #ifndef NET_INSTAWEB_UTIL_PUBLIC_CIRCULAR_BUFFER_H_ 00020 #define NET_INSTAWEB_UTIL_PUBLIC_CIRCULAR_BUFFER_H_ 00021 00022 #include "net/instaweb/util/public/basictypes.h" 00023 #include "net/instaweb/util/public/string.h" 00024 #include "net/instaweb/util/public/string_util.h" 00025 00026 namespace net_instaweb { 00027 00028 class MessageHandler; 00029 00032 class CircularBuffer { 00033 public: 00035 static CircularBuffer* Create(const int capacity); 00043 static CircularBuffer* Init(bool parent, void* block, 00044 const int block_size, 00045 const int capacity); 00049 static int Sizeof(const int capacity) { 00051 int total = sizeof(CircularBuffer) + capacity - 1; 00052 return total; 00053 } 00056 void Clear(); 00058 bool Write(const StringPiece& message); 00060 GoogleString ToString(MessageHandler* handler); 00061 00062 private: 00065 CircularBuffer(); 00066 ~CircularBuffer(); 00068 StringPiece FirstChunk(); 00070 StringPiece SecondChunk(); 00071 00073 int capacity_; 00075 bool wrapped_; 00077 int offset_; 00079 char buffer_[1]; 00080 00081 DISALLOW_COPY_AND_ASSIGN(CircularBuffer); 00082 }; 00083 00084 } 00085 00086 #endif ///< NET_INSTAWEB_UTIL_PUBLIC_CIRCULAR_BUFFER_H_