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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_SEEKABLESTREAMPROXY_H_
#define CORE_FXCRT_CFX_SEEKABLESTREAMPROXY_H_
#include <algorithm>
#include "core/fxcrt/fx_stream.h"
#include "core/fxcrt/fx_system.h"
#include "core/fxcrt/retain_ptr.h"
class CFX_SeekableStreamProxy final : public IFX_SeekableReadStream {
public:
enum class From {
Begin = 0,
Current,
};
template <typename T, typename... Args>
friend RetainPtr<T> pdfium::MakeRetain(Args&&... args);
// IFX_SeekableReadStream:
FX_FILESIZE GetSize() override;
FX_FILESIZE GetPosition() override;
bool IsEOF() override;
size_t ReadBlock(void* pStr, size_t size) override;
bool ReadBlock(void* pStr, FX_FILESIZE offset, size_t size) override;
uint16_t GetCodePage() const { return m_wCodePage; }
void SetCodePage(uint16_t wCodePage);
private:
explicit CFX_SeekableStreamProxy(
const RetainPtr<IFX_SeekableReadStream>& stream);
~CFX_SeekableStreamProxy() override;
void Seek(From eSeek, FX_FILESIZE iOffset);
size_t ReadData(uint8_t* pBuffer, size_t iBufferSize);
uint16_t m_wCodePage;
size_t m_wBOMLength;
FX_FILESIZE m_iPosition;
RetainPtr<IFX_SeekableReadStream> m_pStream;
};
#endif // CORE_FXCRT_CFX_SEEKABLESTREAMPROXY_H_
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