1 // Copyright 2016 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_FPDFAPI_PARSER_CPDF_HINT_TABLES_H_ 8 #define CORE_FPDFAPI_PARSER_CPDF_HINT_TABLES_H_ 9 10 #include <vector> 11 12 #include "core/fpdfapi/parser/cpdf_data_avail.h" 13 #include "core/fxcrt/fx_stream.h" 14 #include "core/fxcrt/unowned_ptr.h" 15 16 class CFX_BitStream; 17 class CPDF_LinearizedHeader; 18 class CPDF_Stream; 19 class CPDF_ReadValidator; 20 21 class CPDF_HintTables { 22 public: 23 CPDF_HintTables(CPDF_ReadValidator* pValidator, 24 CPDF_LinearizedHeader* pLinearized); 25 virtual ~CPDF_HintTables(); 26 27 bool GetPagePos(uint32_t index, 28 FX_FILESIZE* szPageStartPos, 29 FX_FILESIZE* szPageLength, 30 uint32_t* dwObjNum) const; 31 32 CPDF_DataAvail::DocAvailStatus CheckPage(uint32_t index); 33 34 bool LoadHintStream(CPDF_Stream* pHintStream); 35 36 protected: 37 bool ReadPageHintTable(CFX_BitStream* hStream); 38 bool ReadSharedObjHintTable(CFX_BitStream* hStream, uint32_t offset); 39 40 private: 41 // Tests can override. 42 virtual int GetEndOfFirstPageOffset() const; 43 virtual int GetNumberOfPages() const; 44 virtual int GetFirstPageObjectNumber() const; 45 virtual int GetFirstPageNumber() const; 46 virtual int ReadPrimaryHintStreamOffset() const; 47 virtual int ReadPrimaryHintStreamLength() const; 48 49 uint32_t GetItemLength(uint32_t index, 50 const std::vector<FX_FILESIZE>& szArray) const; 51 52 // Owned by |m_pDataAvail|. 53 UnownedPtr<CPDF_ReadValidator> m_pValidator; 54 55 // Owned by |m_pDataAvail|. 56 UnownedPtr<CPDF_LinearizedHeader> const m_pLinearized; 57 58 uint32_t m_nFirstPageSharedObjs; 59 FX_FILESIZE m_szFirstPageObjOffset; 60 std::vector<uint32_t> m_dwDeltaNObjsArray; 61 std::vector<uint32_t> m_dwNSharedObjsArray; 62 std::vector<uint32_t> m_dwSharedObjNumArray; 63 std::vector<uint32_t> m_dwIdentifierArray; 64 std::vector<FX_FILESIZE> m_szPageOffsetArray; 65 std::vector<FX_FILESIZE> m_szSharedObjOffsetArray; 66 }; 67 68 #endif // CORE_FPDFAPI_PARSER_CPDF_HINT_TABLES_H_ 69
