| // 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 |
| |
| #include "core/fpdfapi/parser/cpdf_reference.h" |
| |
| #include "core/fpdfapi/parser/cpdf_indirect_object_holder.h" |
| #include "core/fxcrt/fx_stream.h" |
| #include "third_party/base/check_op.h" |
| #include "third_party/base/containers/contains.h" |
| |
| CPDF_Reference::CPDF_Reference(CPDF_IndirectObjectHolder* pDoc, uint32_t objnum) |
| : m_pObjList(pDoc), m_RefObjNum(objnum) {} |
| |
| CPDF_Reference::~CPDF_Reference() = default; |
| |
| CPDF_Object::Type CPDF_Reference::GetType() const { |
| return kReference; |
| } |
| |
| ByteString CPDF_Reference::GetString() const { |
| const CPDF_Object* obj = SafeGetDirect(); |
| return obj ? obj->GetString() : ByteString(); |
| } |
| |
| float CPDF_Reference::GetNumber() const { |
| const CPDF_Object* obj = SafeGetDirect(); |
| return obj ? obj->GetNumber() : 0; |
| } |
| |
| int CPDF_Reference::GetInteger() const { |
| const CPDF_Object* obj = SafeGetDirect(); |
| return obj ? obj->GetInteger() : 0; |
| } |
| |
| CPDF_Dictionary* CPDF_Reference::GetDict() { |
| CPDF_Object* obj = SafeGetDirect(); |
| return obj ? obj->GetDict() : nullptr; |
| } |
| |
| const CPDF_Dictionary* CPDF_Reference::GetDict() const { |
| const CPDF_Object* obj = SafeGetDirect(); |
| return obj ? obj->GetDict() : nullptr; |
| } |
| |
| bool CPDF_Reference::IsReference() const { |
| return true; |
| } |
| |
| CPDF_Reference* CPDF_Reference::AsReference() { |
| return this; |
| } |
| |
| const CPDF_Reference* CPDF_Reference::AsReference() const { |
| return this; |
| } |
| |
| RetainPtr<CPDF_Object> CPDF_Reference::Clone() const { |
| return CloneObjectNonCyclic(false); |
| } |
| |
| RetainPtr<CPDF_Object> CPDF_Reference::CloneNonCyclic( |
| bool bDirect, |
| std::set<const CPDF_Object*>* pVisited) const { |
| pVisited->insert(this); |
| if (bDirect) { |
| auto* pDirect = GetDirect(); |
| return pDirect && !pdfium::Contains(*pVisited, pDirect) |
| ? pDirect->CloneNonCyclic(true, pVisited) |
| : nullptr; |
| } |
| return pdfium::MakeRetain<CPDF_Reference>(m_pObjList.Get(), m_RefObjNum); |
| } |
| |
| CPDF_Object* CPDF_Reference::SafeGetDirect() { |
| CPDF_Object* obj = GetDirect(); |
| return (obj && !obj->IsReference()) ? obj : nullptr; |
| } |
| |
| const CPDF_Object* CPDF_Reference::SafeGetDirect() const { |
| const CPDF_Object* obj = GetDirect(); |
| return (obj && !obj->IsReference()) ? obj : nullptr; |
| } |
| |
| void CPDF_Reference::SetRef(CPDF_IndirectObjectHolder* pDoc, uint32_t objnum) { |
| m_pObjList = pDoc; |
| m_RefObjNum = objnum; |
| } |
| |
| CPDF_Object* CPDF_Reference::GetDirect() { |
| return m_pObjList ? m_pObjList->GetOrParseIndirectObject(m_RefObjNum) |
| : nullptr; |
| } |
| |
| const CPDF_Object* CPDF_Reference::GetDirect() const { |
| return m_pObjList ? m_pObjList->GetOrParseIndirectObject(m_RefObjNum) |
| : nullptr; |
| } |
| |
| bool CPDF_Reference::WriteTo(IFX_ArchiveStream* archive, |
| const CPDF_Encryptor* encryptor) const { |
| return archive->WriteString(" ") && archive->WriteDWord(GetRefObjNum()) && |
| archive->WriteString(" 0 R "); |
| } |
| |
| RetainPtr<CPDF_Object> CPDF_Reference::MakeReference( |
| CPDF_IndirectObjectHolder* holder) const { |
| DCHECK_EQ(holder, m_pObjList); |
| // Do not allow reference to reference, just create other reference for same |
| // object. |
| return pdfium::MakeRetain<CPDF_Reference>(holder, GetRefObjNum()); |
| } |