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 #include "core/fpdfapi/parser/cpdf_reference.h" 8 9 #include "core/fpdfapi/parser/cpdf_indirect_object_holder.h" 10 #include "third_party/base/ptr_util.h" 11 #include "third_party/base/stl_util.h" 12 13 CPDF_Reference::CPDF_Reference(CPDF_IndirectObjectHolder* pDoc, uint32_t objnum) 14 : m_pObjList(pDoc), m_RefObjNum(objnum) {} 15 16 CPDF_Reference::~CPDF_Reference() {} 17 18 CPDF_Object::Type CPDF_Reference::GetType() const { 19 return REFERENCE; 20 } 21 22 CFX_ByteString CPDF_Reference::GetString() const { 23 CPDF_Object* obj = SafeGetDirect(); 24 return obj ? obj->GetString() : CFX_ByteString(); 25 } 26 27 FX_FLOAT CPDF_Reference::GetNumber() const { 28 CPDF_Object* obj = SafeGetDirect(); 29 return obj ? obj->GetNumber() : 0; 30 } 31 32 int CPDF_Reference::GetInteger() const { 33 CPDF_Object* obj = SafeGetDirect(); 34 return obj ? obj->GetInteger() : 0; 35 } 36 37 CPDF_Dictionary* CPDF_Reference::GetDict() const { 38 CPDF_Object* obj = SafeGetDirect(); 39 return obj ? obj->GetDict() : nullptr; 40 } 41 42 bool CPDF_Reference::IsReference() const { 43 return true; 44 } 45 46 CPDF_Reference* CPDF_Reference::AsReference() { 47 return this; 48 } 49 50 const CPDF_Reference* CPDF_Reference::AsReference() const { 51 return this; 52 } 53 54 std::unique_ptr<CPDF_Object> CPDF_Reference::Clone() const { 55 return CloneObjectNonCyclic(false); 56 } 57 58 std::unique_ptr<CPDF_Object> CPDF_Reference::CloneNonCyclic( 59 bool bDirect, 60 std::set<const CPDF_Object*>* pVisited) const { 61 pVisited->insert(this); 62 if (bDirect) { 63 auto* pDirect = GetDirect(); 64 return pDirect && !pdfium::ContainsKey(*pVisited, pDirect) 65 ? pDirect->CloneNonCyclic(true, pVisited) 66 : nullptr; 67 } 68 return pdfium::MakeUnique<CPDF_Reference>(m_pObjList, m_RefObjNum); 69 } 70 71 CPDF_Object* CPDF_Reference::SafeGetDirect() const { 72 CPDF_Object* obj = GetDirect(); 73 return (obj && !obj->IsReference()) ? obj : nullptr; 74 } 75 76 void CPDF_Reference::SetRef(CPDF_IndirectObjectHolder* pDoc, uint32_t objnum) { 77 m_pObjList = pDoc; 78 m_RefObjNum = objnum; 79 } 80 81 CPDF_Object* CPDF_Reference::GetDirect() const { 82 return m_pObjList ? m_pObjList->GetOrParseIndirectObject(m_RefObjNum) 83 : nullptr; 84 } 85
