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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_MEMORYSTREAM_H_
#define CORE_FXCRT_CFX_MEMORYSTREAM_H_
#include <vector>
#include "core/fxcrt/cfx_retain_ptr.h"
#include "core/fxcrt/fx_stream.h"
class CFX_MemoryStream : public IFX_SeekableStream {
public:
enum Type { kConsecutive = 1 << 0, kTakeOver = 1 << 1 };
template <typename T, typename... Args>
friend CFX_RetainPtr<T> pdfium::MakeRetain(Args&&... args);
// IFX_SeekableStream
FX_FILESIZE GetSize() override;
FX_FILESIZE GetPosition() override;
bool IsEOF() override;
bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
size_t ReadBlock(void* buffer, size_t size) override;
bool WriteBlock(const void* buffer, FX_FILESIZE offset, size_t size) override;
bool Flush() override;
bool IsConsecutive() const { return !!(m_dwFlags & Type::kConsecutive); }
uint8_t* GetBuffer() const {
return !m_Blocks.empty() ? m_Blocks.front() : nullptr;
}
void EstimateSize(size_t nInitSize, size_t nGrowSize);
void AttachBuffer(uint8_t* pBuffer, size_t nSize);
void DetachBuffer();
private:
explicit CFX_MemoryStream(bool bConsecutive);
CFX_MemoryStream(uint8_t* pBuffer, size_t nSize, bool bTakeOver);
~CFX_MemoryStream() override;
bool ExpandBlocks(size_t size);
std::vector<uint8_t*> m_Blocks;
size_t m_nTotalSize;
size_t m_nCurSize;
size_t m_nCurPos;
size_t m_nGrowSize;
uint32_t m_dwFlags;
};
#endif // CORE_FXCRT_CFX_MEMORYSTREAM_H_
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