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// 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/ptr_util.h"
#include "third_party/base/stl_util.h"
CPDF_Reference::CPDF_Reference(CPDF_IndirectObjectHolder* pDoc, uint32_t objnum)
: m_pObjList(pDoc), m_RefObjNum(objnum) {}
CPDF_Reference::~CPDF_Reference() {}
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;
}
std::unique_ptr<CPDF_Object> CPDF_Reference::Clone() const {
return CloneObjectNonCyclic(false);
}
std::unique_ptr<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::ContainsKey(*pVisited, pDirect)
? pDirect->CloneNonCyclic(true, pVisited)
: nullptr;
}
return pdfium::MakeUnique<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 ");
}
std::unique_ptr<CPDF_Object> CPDF_Reference::MakeReference(
CPDF_IndirectObjectHolder* holder) const {
ASSERT(holder == m_pObjList.Get());
// Do not allow reference to reference, just create other reference for same
// object.
return pdfium::MakeUnique<CPDF_Reference>(holder, GetRefObjNum());
}
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