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// Copyright 2017 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#ifndef CORE_FXCRT_CFX_BLOCKBUFFER_H_
#define CORE_FXCRT_CFX_BLOCKBUFFER_H_
#include <stdint.h>
#include <memory>
#include <vector>
#include "core/fxcrt/fx_string.h"
class CFX_BlockBuffer {
public:
explicit CFX_BlockBuffer(int32_t iAllocStep = 1024 * 1024);
~CFX_BlockBuffer();
bool InitBuffer(int32_t iBufferSize = 1024 * 1024);
bool IsInitialized() { return m_iBufferSize / m_iAllocStep >= 1; }
wchar_t* GetAvailableBlock(int32_t& iIndexInBlock);
inline int32_t GetAllocStep() const { return m_iAllocStep; }
inline int32_t& GetDataLengthRef() { return m_iDataLength; }
inline void Reset(bool bReserveData = true) {
if (!bReserveData)
m_iStartPosition = 0;
m_iDataLength = 0;
}
void SetTextChar(int32_t iIndex, wchar_t ch);
int32_t DeleteTextChars(int32_t iCount, bool bDirection = true);
void GetTextData(CFX_WideString& wsTextData,
int32_t iStart = 0,
int32_t iLength = -1) const;
private:
inline void TextDataIndex2BufIndex(const int32_t iIndex,
int32_t& iBlockIndex,
int32_t& iInnerIndex) const;
void ClearBuffer();
std::vector<std::unique_ptr<wchar_t, FxFreeDeleter>> m_BlockArray;
int32_t m_iDataLength;
int32_t m_iBufferSize;
int32_t m_iAllocStep;
int32_t m_iStartPosition;
};
#endif // CORE_FXCRT_CFX_BLOCKBUFFER_H_
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