Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame^] | 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 | #ifndef CORE_FPDFAPI_PARSER_CPDF_CROSS_REF_AVAIL_H_ |
| 6 | #define CORE_FPDFAPI_PARSER_CPDF_CROSS_REF_AVAIL_H_ |
| 7 | |
| 8 | #include <memory> |
| 9 | #include <queue> |
| 10 | #include <set> |
| 11 | |
| 12 | #include "core/fpdfapi/parser/cpdf_data_avail.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 | |
| 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 | kCrossRefV4ItemCheck, |
| 31 | kCrossRefV4TrailerCheck, |
| 32 | kDone, |
| 33 | }; |
| 34 | |
| 35 | bool CheckReadProblems(); |
| 36 | bool CheckCrossRef(); |
| 37 | bool CheckCrossRefV4(); |
| 38 | bool CheckCrossRefV4Item(); |
| 39 | bool CheckCrossRefV4Trailer(); |
| 40 | bool CheckCrossRefStream(); |
| 41 | |
| 42 | void AddCrossRefForCheck(FX_FILESIZE crossref_offset); |
| 43 | |
| 44 | fxcrt::RetainPtr<CPDF_ReadValidator> GetValidator(); |
| 45 | |
| 46 | fxcrt::UnownedPtr<CPDF_SyntaxParser> parser_; |
| 47 | const FX_FILESIZE last_crossref_offset_ = 0; |
| 48 | CPDF_DataAvail::DocAvailStatus current_status_ = |
| 49 | CPDF_DataAvail::DataNotAvailable; |
| 50 | State current_state_ = State::kCrossRefCheck; |
| 51 | FX_FILESIZE current_offset_ = 0; |
| 52 | std::queue<FX_FILESIZE> cross_refs_for_check_; |
| 53 | std::set<FX_FILESIZE> registered_crossrefs_; |
| 54 | }; |
| 55 | |
| 56 | #endif // CORE_FPDFAPI_PARSER_CPDF_CROSS_REF_AVAIL_H_ |