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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 <utility>
#include <vector>
#include "core/fxcrt/fx_string.h"
class CFX_BlockBuffer {
public:
CFX_BlockBuffer();
~CFX_BlockBuffer();
bool InitBuffer();
bool IsInitialized() { return m_BufferSize / GetAllocStep() >= 1; }
std::pair<wchar_t*, size_t> GetAvailableBlock();
size_t GetAllocStep() const;
size_t GetDataLength() const { return m_DataLength; }
void IncrementDataLength() { m_DataLength++; }
bool IsEmpty() const { return m_DataLength == 0; }
void Reset(bool bReserveData) {
if (!bReserveData)
m_StartPosition = 0;
m_DataLength = 0;
}
void SetTextChar(size_t iIndex, wchar_t ch);
void DeleteTextChars(size_t iCount);
WideString GetTextData(size_t iStart, size_t iLength) const;
private:
std::pair<size_t, size_t> TextDataIndex2BufIndex(const size_t iIndex) const;
std::vector<std::unique_ptr<wchar_t, FxFreeDeleter>> m_BlockArray;
size_t m_DataLength;
size_t m_BufferSize;
size_t m_StartPosition;
};
#endif // CORE_FXCRT_CFX_BLOCKBUFFER_H_
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