1 // Copyright 2017 The PDFium Authors 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CORE_FPDFAPI_PARSER_CPDF_CROSS_REF_AVAIL_H_ 6 #define CORE_FPDFAPI_PARSER_CPDF_CROSS_REF_AVAIL_H_ 7 8 #include <queue> 9 #include <set> 10 11 #include "core/fpdfapi/parser/cpdf_data_avail.h" 12 #include "core/fxcrt/retain_ptr.h" 13 #include "core/fxcrt/unowned_ptr.h" 14 15 class CPDF_SyntaxParser; 16 17 class CPDF_CrossRefAvail { 18 public: 19 CPDF_CrossRefAvail(CPDF_SyntaxParser* parser, 20 FX_FILESIZE last_crossref_offset); 21 ~CPDF_CrossRefAvail(); 22 last_crossref_offset()23 FX_FILESIZE last_crossref_offset() const { return last_crossref_offset_; } 24 25 CPDF_DataAvail::DocAvailStatus CheckAvail(); 26 27 private: 28 enum class State { 29 kCrossRefCheck, 30 kCrossRefTableItemCheck, 31 kCrossRefTableTrailerCheck, 32 kDone, 33 }; 34 35 bool CheckReadProblems(); 36 bool CheckCrossRef(); 37 bool CheckCrossRefTable(); 38 bool CheckCrossRefTableItem(); 39 bool CheckCrossRefTableTrailer(); 40 bool CheckCrossRefStream(); 41 42 void AddCrossRefForCheck(FX_FILESIZE crossref_offset); 43 44 RetainPtr<CPDF_ReadValidator> GetValidator(); 45 46 UnownedPtr<CPDF_SyntaxParser> const parser_; 47 const FX_FILESIZE last_crossref_offset_; 48 CPDF_DataAvail::DocAvailStatus status_ = CPDF_DataAvail::kDataNotAvailable; 49 State state_ = State::kCrossRefCheck; 50 FX_FILESIZE offset_ = 0; 51 std::queue<FX_FILESIZE> cross_refs_for_check_; 52 std::set<FX_FILESIZE> registered_crossrefs_; 53 }; 54 55 #endif // CORE_FPDFAPI_PARSER_CPDF_CROSS_REF_AVAIL_H_ 56