1 // Copyright 2018 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_OBJECT_STREAM_H_ 6 #define CORE_FPDFAPI_PARSER_CPDF_OBJECT_STREAM_H_ 7 8 #include <memory> 9 #include <vector> 10 11 #include "core/fpdfapi/parser/cpdf_object.h" 12 #include "core/fxcrt/retain_ptr.h" 13 14 class CPDF_IndirectObjectHolder; 15 class CPDF_Stream; 16 class CPDF_StreamAcc; 17 class IFX_SeekableReadStream; 18 19 // Implementation of logic of PDF "Object Streams". 20 // See ISO 32000-1:2008 spec, section 7.5.7. 21 class CPDF_ObjectStream { 22 public: 23 struct ObjectInfo { ObjectInfoObjectInfo24 ObjectInfo(uint32_t obj_num, uint32_t obj_offset) 25 : obj_num(obj_num), obj_offset(obj_offset) {} 26 27 bool operator==(const ObjectInfo& that) const { 28 return obj_num == that.obj_num && obj_offset == that.obj_offset; 29 } 30 31 uint32_t obj_num; 32 uint32_t obj_offset; 33 }; 34 35 static std::unique_ptr<CPDF_ObjectStream> Create( 36 RetainPtr<const CPDF_Stream> stream); 37 38 ~CPDF_ObjectStream(); 39 40 RetainPtr<CPDF_Object> ParseObject(CPDF_IndirectObjectHolder* pObjList, 41 uint32_t obj_number, 42 uint32_t archive_obj_index) const; object_info()43 const std::vector<ObjectInfo>& object_info() const { return object_info_; } 44 45 private: 46 explicit CPDF_ObjectStream(RetainPtr<const CPDF_Stream> stream); 47 48 void Init(const CPDF_Stream* stream); 49 RetainPtr<CPDF_Object> ParseObjectAtOffset( 50 CPDF_IndirectObjectHolder* pObjList, 51 uint32_t object_offset) const; 52 53 // Must outlive `data_stream_`. 54 RetainPtr<CPDF_StreamAcc> const stream_acc_; 55 RetainPtr<IFX_SeekableReadStream> data_stream_; 56 int first_object_offset_ = 0; 57 std::vector<ObjectInfo> object_info_; 58 }; 59 60 #endif // CORE_FPDFAPI_PARSER_CPDF_OBJECT_STREAM_H_ 61