| // Copyright 2016 PDFium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| |
| #ifndef CORE_FPDFAPI_PARSER_CPDF_OBJECT_H_ |
| #define CORE_FPDFAPI_PARSER_CPDF_OBJECT_H_ |
| |
| #include <stdint.h> |
| |
| #include <set> |
| #include <type_traits> |
| |
| #include "core/fxcrt/fx_string.h" |
| #include "core/fxcrt/retain_ptr.h" |
| |
| class CPDF_Array; |
| class CPDF_Boolean; |
| class CPDF_Dictionary; |
| class CPDF_Encryptor; |
| class CPDF_IndirectObjectHolder; |
| class CPDF_Name; |
| class CPDF_Number; |
| class CPDF_Reference; |
| class CPDF_Stream; |
| class CPDF_String; |
| class IFX_ArchiveStream; |
| |
| class CPDF_Object : public Retainable { |
| public: |
| static constexpr uint32_t kInvalidObjNum = static_cast<uint32_t>(-1); |
| enum Type { |
| kBoolean = 1, |
| kNumber, |
| kString, |
| kName, |
| kArray, |
| kDictionary, |
| kStream, |
| kNullobj, |
| kReference |
| }; |
| |
| virtual Type GetType() const = 0; |
| uint32_t GetObjNum() const { return m_ObjNum; } |
| void SetObjNum(uint32_t objnum) { m_ObjNum = objnum; } |
| uint32_t GetGenNum() const { return m_GenNum; } |
| void SetGenNum(uint32_t gennum) { m_GenNum = gennum; } |
| bool IsInline() const { return m_ObjNum == 0; } |
| uint64_t KeyForCache() const; |
| |
| // Create a deep copy of the object. |
| virtual RetainPtr<CPDF_Object> Clone() const = 0; |
| |
| // Create a deep copy of the object except any reference object be |
| // copied to the object it points to directly. |
| virtual RetainPtr<CPDF_Object> CloneDirectObject() const; |
| |
| virtual CPDF_Object* GetDirect(); |
| virtual const CPDF_Object* GetDirect() const; |
| virtual ByteString GetString() const; |
| virtual WideString GetUnicodeText() const; |
| virtual float GetNumber() const; |
| virtual int GetInteger() const; |
| virtual CPDF_Dictionary* GetDict(); |
| virtual const CPDF_Dictionary* GetDict() const; |
| |
| virtual void SetString(const ByteString& str); |
| |
| virtual bool IsArray() const; |
| virtual bool IsBoolean() const; |
| virtual bool IsDictionary() const; |
| virtual bool IsName() const; |
| virtual bool IsNumber() const; |
| virtual bool IsReference() const; |
| virtual bool IsStream() const; |
| virtual bool IsString() const; |
| virtual bool IsNull() const; |
| |
| virtual CPDF_Array* AsArray(); |
| virtual const CPDF_Array* AsArray() const; |
| virtual CPDF_Boolean* AsBoolean(); |
| virtual const CPDF_Boolean* AsBoolean() const; |
| virtual CPDF_Dictionary* AsDictionary(); |
| virtual const CPDF_Dictionary* AsDictionary() const; |
| virtual CPDF_Name* AsName(); |
| virtual const CPDF_Name* AsName() const; |
| virtual CPDF_Number* AsNumber(); |
| virtual const CPDF_Number* AsNumber() const; |
| virtual CPDF_Reference* AsReference(); |
| virtual const CPDF_Reference* AsReference() const; |
| virtual CPDF_Stream* AsStream(); |
| virtual const CPDF_Stream* AsStream() const; |
| virtual CPDF_String* AsString(); |
| virtual const CPDF_String* AsString() const; |
| |
| virtual bool WriteTo(IFX_ArchiveStream* archive, |
| const CPDF_Encryptor* encryptor) const = 0; |
| |
| // Create a deep copy of the object with the option to either |
| // copy a reference object or directly copy the object it refers to |
| // when |bDirect| is true. |
| // Also check cyclic reference against |pVisited|, no copy if it is found. |
| // Complex objects should implement their own CloneNonCyclic() |
| // function to properly check for possible loop. |
| virtual RetainPtr<CPDF_Object> CloneNonCyclic( |
| bool bDirect, |
| std::set<const CPDF_Object*>* pVisited) const; |
| |
| // Return a reference to itself. |
| // The object must be direct (!IsInlined). |
| virtual RetainPtr<CPDF_Object> MakeReference( |
| CPDF_IndirectObjectHolder* holder) const; |
| |
| protected: |
| CPDF_Object() = default; |
| CPDF_Object(const CPDF_Object& src) = delete; |
| ~CPDF_Object() override; |
| |
| RetainPtr<CPDF_Object> CloneObjectNonCyclic(bool bDirect) const; |
| |
| uint32_t m_ObjNum = 0; |
| uint32_t m_GenNum = 0; |
| }; |
| |
| template <typename T> |
| struct CanInternStrings { |
| static constexpr bool value = std::is_same<T, CPDF_Array>::value || |
| std::is_same<T, CPDF_Dictionary>::value || |
| std::is_same<T, CPDF_Name>::value || |
| std::is_same<T, CPDF_String>::value; |
| }; |
| |
| #endif // CORE_FPDFAPI_PARSER_CPDF_OBJECT_H_ |