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 "core/fxcrt/fx_stream.h"
11 #include "third_party/base/ptr_util.h"
12 #include "third_party/base/stl_util.h"
13
CPDF_Reference(CPDF_IndirectObjectHolder * pDoc,uint32_t objnum)14 CPDF_Reference::CPDF_Reference(CPDF_IndirectObjectHolder* pDoc, uint32_t objnum)
15 : m_pObjList(pDoc), m_RefObjNum(objnum) {}
16
~CPDF_Reference()17 CPDF_Reference::~CPDF_Reference() {}
18
GetType() const19 CPDF_Object::Type CPDF_Reference::GetType() const {
20 return REFERENCE;
21 }
22
GetString() const23 ByteString CPDF_Reference::GetString() const {
24 CPDF_Object* obj = SafeGetDirect();
25 return obj ? obj->GetString() : ByteString();
26 }
27
GetNumber() const28 float CPDF_Reference::GetNumber() const {
29 CPDF_Object* obj = SafeGetDirect();
30 return obj ? obj->GetNumber() : 0;
31 }
32
GetInteger() const33 int CPDF_Reference::GetInteger() const {
34 CPDF_Object* obj = SafeGetDirect();
35 return obj ? obj->GetInteger() : 0;
36 }
37
GetDict() const38 CPDF_Dictionary* CPDF_Reference::GetDict() const {
39 CPDF_Object* obj = SafeGetDirect();
40 return obj ? obj->GetDict() : nullptr;
41 }
42
IsReference() const43 bool CPDF_Reference::IsReference() const {
44 return true;
45 }
46
AsReference()47 CPDF_Reference* CPDF_Reference::AsReference() {
48 return this;
49 }
50
AsReference() const51 const CPDF_Reference* CPDF_Reference::AsReference() const {
52 return this;
53 }
54
Clone() const55 std::unique_ptr<CPDF_Object> CPDF_Reference::Clone() const {
56 return CloneObjectNonCyclic(false);
57 }
58
CloneNonCyclic(bool bDirect,std::set<const CPDF_Object * > * pVisited) const59 std::unique_ptr<CPDF_Object> CPDF_Reference::CloneNonCyclic(
60 bool bDirect,
61 std::set<const CPDF_Object*>* pVisited) const {
62 pVisited->insert(this);
63 if (bDirect) {
64 auto* pDirect = GetDirect();
65 return pDirect && !pdfium::ContainsKey(*pVisited, pDirect)
66 ? pDirect->CloneNonCyclic(true, pVisited)
67 : nullptr;
68 }
69 return pdfium::MakeUnique<CPDF_Reference>(m_pObjList.Get(), m_RefObjNum);
70 }
71
SafeGetDirect() const72 CPDF_Object* CPDF_Reference::SafeGetDirect() const {
73 CPDF_Object* obj = GetDirect();
74 return (obj && !obj->IsReference()) ? obj : nullptr;
75 }
76
SetRef(CPDF_IndirectObjectHolder * pDoc,uint32_t objnum)77 void CPDF_Reference::SetRef(CPDF_IndirectObjectHolder* pDoc, uint32_t objnum) {
78 m_pObjList = pDoc;
79 m_RefObjNum = objnum;
80 }
81
GetDirect() const82 CPDF_Object* CPDF_Reference::GetDirect() const {
83 return m_pObjList ? m_pObjList->GetOrParseIndirectObject(m_RefObjNum)
84 : nullptr;
85 }
86
WriteTo(IFX_ArchiveStream * archive) const87 bool CPDF_Reference::WriteTo(IFX_ArchiveStream* archive) const {
88 return archive->WriteString(" ") && archive->WriteDWord(GetRefObjNum()) &&
89 archive->WriteString(" 0 R ");
90 }
91