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// Copyright 2017 The PDFium Authors
// 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 <stddef.h>
#include <stdint.h>
#include "core/fxcrt/fx_codepage.h"
#include "core/fxcrt/fx_stream.h"
#include "core/fxcrt/fx_types.h"
#include "core/fxcrt/retain_ptr.h"
#include "core/fxcrt/span.h"
class CFX_SeekableStreamProxy final : public Retainable {
public:
CONSTRUCT_VIA_MAKE_RETAIN;
FX_FILESIZE GetSize() const; // Estimate under worst possible expansion.
bool IsEOF() const;
// Returns number of wchar_t elements placed into `buffer`.
size_t ReadBlock(pdfium::span<wchar_t> buffer);
FX_CodePage GetCodePage() const { return m_wCodePage; }
void SetCodePage(FX_CodePage wCodePage);
private:
enum class From {
Begin = 0,
Current,
};
explicit CFX_SeekableStreamProxy(
const RetainPtr<IFX_SeekableReadStream>& stream);
~CFX_SeekableStreamProxy() override;
FX_FILESIZE GetPosition() const;
void Seek(From eSeek, FX_FILESIZE iOffset);
size_t ReadData(pdfium::span<uint8_t> buffer);
FX_CodePage m_wCodePage = FX_CodePage::kDefANSI;
size_t m_wBOMLength = 0;
FX_FILESIZE m_iPosition = 0;
RetainPtr<IFX_SeekableReadStream> const m_pStream;
};
#endif // CORE_FXCRT_CFX_SEEKABLESTREAMPROXY_H_