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