1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef NET_TOOLS_BALSA_SIMPLE_BUFFER_H__ 6 #define NET_TOOLS_BALSA_SIMPLE_BUFFER_H__ 7 8 #include <string> 9 10 #include "base/compiler_specific.h" 11 #include "net/tools/balsa/buffer_interface.h" 12 13 namespace net { 14 15 class SimpleBuffer : public BufferInterface { 16 public: 17 SimpleBuffer(); 18 explicit SimpleBuffer(int size); 19 virtual ~SimpleBuffer(); 20 21 std::string str() const; 22 23 typedef char * iterator; 24 typedef const char * const_iterator; 25 26 iterator begin() { return storage_ + read_idx_; } 27 const_iterator begin() const { return storage_ + read_idx_; } 28 29 iterator end() { return storage_ + write_idx_; } 30 const_iterator end() const { return storage_ + write_idx_; } 31 32 // The following functions all override pure virtual functions 33 // in BufferInterface. See buffer_interface.h for a description 34 // of what they do. 35 virtual int ReadableBytes() const OVERRIDE; 36 virtual int BufferSize() const OVERRIDE; 37 virtual int BytesFree() const OVERRIDE; 38 39 virtual bool Empty() const OVERRIDE; 40 virtual bool Full() const OVERRIDE; 41 42 virtual int Write(const char* bytes, int size) OVERRIDE; 43 44 virtual void GetWritablePtr(char **ptr, int* size) const OVERRIDE; 45 46 virtual void GetReadablePtr(char **ptr, int* size) const OVERRIDE; 47 48 virtual int Read(char* bytes, int size) OVERRIDE; 49 50 virtual void Clear() OVERRIDE; 51 52 // This can be an expensive operation: costing a new/delete, and copying of 53 // all existing data. Even if the existing buffer does not need to be 54 // resized, unread data may still need to be non-destructively copied to 55 // consolidate fragmented free space. 56 virtual bool Reserve(int size) OVERRIDE; 57 58 virtual void AdvanceReadablePtr(int amount_to_advance) OVERRIDE; 59 60 virtual void AdvanceWritablePtr(int amount_to_advance) OVERRIDE; 61 62 void Swap(SimpleBuffer* other) { 63 char* tmp = storage_; 64 storage_ = other->storage_; 65 other->storage_ = tmp; 66 67 int tmp_int = write_idx_; 68 write_idx_ = other->write_idx_; 69 other->write_idx_ = tmp_int; 70 71 tmp_int = read_idx_; 72 read_idx_ = other->read_idx_; 73 other->read_idx_ = tmp_int; 74 75 tmp_int = storage_size_; 76 storage_size_ = other->storage_size_; 77 other->storage_size_ = tmp_int; 78 } 79 80 protected: 81 char* storage_; 82 int write_idx_; 83 int read_idx_; 84 int storage_size_; 85 86 private: 87 //DISALLOW_COPY_AND_ASSIGN(SimpleBuffer); 88 }; 89 90 } // namespace net 91 92 #endif // NET_TOOLS_BALSA_SIMPLE_BUFFER_H__ 93
