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_INDIRECT_OBJECT_HOLDER_H_ 8 #define CORE_FPDFAPI_PARSER_CPDF_INDIRECT_OBJECT_HOLDER_H_ 9 10 #include <map> 11 #include <memory> 12 #include <type_traits> 13 #include <utility> 14 #include <vector> 15 16 #include "core/fpdfapi/parser/cpdf_object.h" 17 #include "core/fxcrt/fx_system.h" 18 #include "core/fxcrt/string_pool_template.h" 19 #include "core/fxcrt/weak_ptr.h" 20 #include "third_party/base/ptr_util.h" 21 22 class CPDF_IndirectObjectHolder { 23 public: 24 using const_iterator = 25 std::map<uint32_t, std::unique_ptr<CPDF_Object>>::const_iterator; 26 27 CPDF_IndirectObjectHolder(); 28 virtual ~CPDF_IndirectObjectHolder(); 29 30 CPDF_Object* GetIndirectObject(uint32_t objnum) const; 31 virtual CPDF_Object* GetOrParseIndirectObject(uint32_t objnum); 32 void DeleteIndirectObject(uint32_t objnum); 33 34 // Creates and adds a new object owned by the indirect object holder, 35 // and returns an unowned pointer to it. We have a special case to 36 // handle objects that can intern strings from our ByteStringPool. 37 template <typename T, typename... Args> 38 typename std::enable_if<!CanInternStrings<T>::value, T*>::type NewIndirect( 39 Args&&... args) { 40 return static_cast<T*>( 41 AddIndirectObject(pdfium::MakeUnique<T>(std::forward<Args>(args)...))); 42 } 43 template <typename T, typename... Args> 44 typename std::enable_if<CanInternStrings<T>::value, T*>::type NewIndirect( 45 Args&&... args) { 46 return static_cast<T*>(AddIndirectObject( 47 pdfium::MakeUnique<T>(m_pByteStringPool, std::forward<Args>(args)...))); 48 } 49 50 // Takes ownership of |pObj|, returns unowned pointer to it. 51 CPDF_Object* AddIndirectObject(std::unique_ptr<CPDF_Object> pObj); 52 53 // Always takes ownership of |pObj|, return true if higher generation number. 54 bool ReplaceIndirectObjectIfHigherGeneration( 55 uint32_t objnum, 56 std::unique_ptr<CPDF_Object> pObj); 57 58 uint32_t GetLastObjNum() const { return m_LastObjNum; } 59 void SetLastObjNum(uint32_t objnum) { m_LastObjNum = objnum; } 60 61 WeakPtr<ByteStringPool> GetByteStringPool() const { 62 return m_pByteStringPool; 63 } 64 65 const_iterator begin() const { return m_IndirectObjs.begin(); } 66 const_iterator end() const { return m_IndirectObjs.end(); } 67 68 protected: 69 virtual std::unique_ptr<CPDF_Object> ParseIndirectObject(uint32_t objnum); 70 71 private: 72 uint32_t m_LastObjNum; 73 std::map<uint32_t, std::unique_ptr<CPDF_Object>> m_IndirectObjs; 74 std::vector<std::unique_ptr<CPDF_Object>> m_OrphanObjs; 75 WeakPtr<ByteStringPool> m_pByteStringPool; 76 }; 77 78 #endif // CORE_FPDFAPI_PARSER_CPDF_INDIRECT_OBJECT_HOLDER_H_ 79
