1 // Copyright 2017 PDFium 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 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com 6 7 #ifndef CORE_FXCRT_CFX_BLOCKBUFFER_H_ 8 #define CORE_FXCRT_CFX_BLOCKBUFFER_H_ 9 10 #include <stdint.h> 11 12 #include <memory> 13 #include <utility> 14 #include <vector> 15 16 #include "core/fxcrt/fx_string.h" 17 18 class CFX_BlockBuffer { 19 public: 20 CFX_BlockBuffer(); 21 ~CFX_BlockBuffer(); 22 23 bool InitBuffer(); 24 bool IsInitialized() { return m_BufferSize / GetAllocStep() >= 1; } 25 26 std::pair<wchar_t*, size_t> GetAvailableBlock(); 27 size_t GetAllocStep() const; 28 size_t GetDataLength() const { return m_DataLength; } 29 void IncrementDataLength() { m_DataLength++; } 30 bool IsEmpty() const { return m_DataLength == 0; } 31 32 void Reset(bool bReserveData) { 33 if (!bReserveData) 34 m_StartPosition = 0; 35 m_DataLength = 0; 36 } 37 38 void SetTextChar(size_t iIndex, wchar_t ch); 39 void DeleteTextChars(size_t iCount); 40 WideString GetTextData(size_t iStart, size_t iLength) const; 41 42 private: 43 std::pair<size_t, size_t> TextDataIndex2BufIndex(const size_t iIndex) const; 44 45 std::vector<std::unique_ptr<wchar_t, FxFreeDeleter>> m_BlockArray; 46 size_t m_DataLength; 47 size_t m_BufferSize; 48 size_t m_StartPosition; 49 }; 50 51 #endif // CORE_FXCRT_CFX_BLOCKBUFFER_H_ 52
