1 // Copyright 2017 PDFium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com 6 7 #ifndef CORE_FXCRT_CFX_SEEKABLESTREAMPROXY_H_ 8 #define CORE_FXCRT_CFX_SEEKABLESTREAMPROXY_H_ 9 10 #include <algorithm> 11 12 #include "core/fxcrt/fx_stream.h" 13 #include "core/fxcrt/fx_system.h" 14 #include "core/fxcrt/retain_ptr.h" 15 16 class CFX_SeekableStreamProxy : public Retainable { 17 public: 18 enum class From { 19 Begin = 0, 20 Current, 21 }; 22 23 template <typename T, typename... Args> 24 friend RetainPtr<T> pdfium::MakeRetain(Args&&... args); 25 26 FX_FILESIZE GetLength() const { return m_pStream->GetSize(); } 27 FX_FILESIZE GetPosition() { return m_iPosition; } 28 size_t GetBOMLength() const { return m_wBOMLength; } 29 bool IsEOF() const { return m_iPosition >= GetLength(); } 30 31 void Seek(From eSeek, FX_FILESIZE iOffset); 32 size_t ReadString(wchar_t* pStr, size_t iMaxLength, bool* bEOS); 33 34 void WriteString(const WideStringView& str); 35 36 uint16_t GetCodePage() const { return m_wCodePage; } 37 void SetCodePage(uint16_t wCodePage); 38 39 private: 40 CFX_SeekableStreamProxy(const RetainPtr<IFX_SeekableStream>& stream, 41 bool isWriteSteam); 42 CFX_SeekableStreamProxy(uint8_t* data, size_t size); 43 ~CFX_SeekableStreamProxy() override; 44 45 size_t ReadData(uint8_t* pBuffer, size_t iBufferSize); 46 47 bool m_IsWriteStream; 48 uint16_t m_wCodePage; 49 size_t m_wBOMLength; 50 FX_FILESIZE m_iPosition; 51 RetainPtr<IFX_SeekableStream> m_pStream; 52 }; 53 54 #endif // CORE_FXCRT_CFX_SEEKABLESTREAMPROXY_H_ 55
