Make CPDF_Array take unique_ptrs

core/fpdfapi/parser/cpdf_array.cpp

 // 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_array.h"
 
 #include <set>
 
 #include "core/fpdfapi/parser/cpdf_name.h"
 #include "core/fpdfapi/parser/cpdf_number.h"
 #include "core/fpdfapi/parser/cpdf_reference.h"
 #include "core/fpdfapi/parser/cpdf_stream.h"
 #include "core/fpdfapi/parser/cpdf_string.h"
 #include "third_party/base/logging.h"
 #include "third_party/base/stl_util.h"
 
 CPDF_Array::CPDF_Array() {}
 
 CPDF_Array::~CPDF_Array() {
-  // Mark the object as deleted so that it will not be deleted again
-  // in case of cyclic references.
+  // Break cycles for cyclic references.
   m_ObjNum = kInvalidObjNum;
   for (auto& it : m_Objects) {
-    if (it && it->GetObjNum() != kInvalidObjNum)
-      delete it;
+    if (it && it->GetObjNum() == kInvalidObjNum)
+      it.release();
   }
 }
 
 CPDF_Object::Type CPDF_Array::GetType() const {
   return ARRAY;
 }
 
 bool CPDF_Array::IsArray() const {
   return true;
 }
 
 CPDF_Array* CPDF_Array::AsArray() {
   return this;
 }
 
 const CPDF_Array* CPDF_Array::AsArray() const {
   return this;
 }
 
 std::unique_ptr<CPDF_Object> CPDF_Array::Clone() const {
   return CloneObjectNonCyclic(false);
 }
 
 std::unique_ptr<CPDF_Object> CPDF_Array::CloneNonCyclic(
     bool bDirect,
     std::set<const CPDF_Object*>* pVisited) const {
   pVisited->insert(this);
   auto pCopy = pdfium::MakeUnique<CPDF_Array>();
-  for (CPDF_Object* value : m_Objects) {
-    if (!pdfium::ContainsKey(*pVisited, value)) {
-      pCopy->m_Objects.push_back(
-          value->CloneNonCyclic(bDirect, pVisited).release());
-    }
+  for (const auto& pValue : m_Objects) {
+    if (!pdfium::ContainsKey(*pVisited, pValue.get()))
+      pCopy->m_Objects.push_back(pValue->CloneNonCyclic(bDirect, pVisited));
   }
   return std::move(pCopy);
 }
 
 CFX_FloatRect CPDF_Array::GetRect() {
   CFX_FloatRect rect;
   if (!IsArray() || m_Objects.size() != 4)
     return rect;
 
   rect.left = GetNumberAt(0);
   rect.bottom = GetNumberAt(1);
   rect.right = GetNumberAt(2);
   rect.top = GetNumberAt(3);
   return rect;
 }
 
 CFX_Matrix CPDF_Array::GetMatrix() {
   CFX_Matrix matrix;
   if (!IsArray() || m_Objects.size() != 6)
     return matrix;
 
   matrix.Set(GetNumberAt(0), GetNumberAt(1), GetNumberAt(2), GetNumberAt(3),
              GetNumberAt(4), GetNumberAt(5));
   return matrix;
 }
 
 CPDF_Object* CPDF_Array::GetObjectAt(size_t i) const {
   if (i >= m_Objects.size())
     return nullptr;
-  return m_Objects[i];
+  return m_Objects[i].get();
 }
 
 CPDF_Object* CPDF_Array::GetDirectObjectAt(size_t i) const {
   if (i >= m_Objects.size())
     return nullptr;
   return m_Objects[i]->GetDirect();
 }
 
 CFX_ByteString CPDF_Array::GetStringAt(size_t i) const {
   if (i >= m_Objects.size())
@@ skipping 32 matching lines @@
   return ToArray(GetDirectObjectAt(i));
 }
 
 void CPDF_Array::RemoveAt(size_t i, size_t nCount) {
   if (i >= m_Objects.size())
     return;
 
   if (nCount <= 0 || nCount > m_Objects.size() - i)
     return;
 
-  for (size_t j = 0; j < nCount; ++j)
-    delete m_Objects[i + j];
-
   m_Objects.erase(m_Objects.begin() + i, m_Objects.begin() + i + nCount);
 }
 
 void CPDF_Array::ConvertToIndirectObjectAt(size_t i,
                                            CPDF_IndirectObjectHolder* pHolder) {
   if (i >= m_Objects.size())
     return;
 
-  CPDF_Object* pObj = m_Objects[i];
-  if (!pObj || pObj->IsReference())
+  if (!m_Objects[i] || m_Objects[i]->IsReference())
     return;
 
-  CPDF_Object* pNew = pHolder->AddIndirectObject(pdfium::WrapUnique(pObj));
-  m_Objects[i] = new CPDF_Reference(pHolder, pNew->GetObjNum());
+  CPDF_Object* pNew = pHolder->AddIndirectObject(std::move(m_Objects[i]));
+  m_Objects[i] = pdfium::MakeUnique<CPDF_Reference>(pHolder, pNew->GetObjNum());
 }
 
-void CPDF_Array::SetAt(size_t i, CPDF_Object* pObj) {
+CPDF_Object* CPDF_Array::SetAt(size_t i, std::unique_ptr<CPDF_Object> pObj) {
+  ASSERT(IsArray());
+  ASSERT(!pObj || pObj->IsInline());
+  if (i >= m_Objects.size()) {
+    ASSERT(false);
+    return nullptr;
+  }
+  CPDF_Object* pRet = pObj.get();
+  m_Objects[i] = std::move(pObj);
+  return pRet;
+}
+
+CPDF_Object* CPDF_Array::InsertAt(size_t index,
+                                  std::unique_ptr<CPDF_Object> pObj) {
   ASSERT(IsArray());
   CHECK(!pObj || pObj->IsInline());
-  if (i >= m_Objects.size()) {
-    ASSERT(false);
-    return;
+  CPDF_Object* pRet = pObj.get();
+  if (index >= m_Objects.size()) {
+    // Allocate space first.
+    m_Objects.resize(index + 1);
+    m_Objects[index] = std::move(pObj);
+  } else {
+    // Directly insert.
+    m_Objects.insert(m_Objects.begin() + index, std::move(pObj));
   }
-  delete m_Objects[i];
-  m_Objects[i] = pObj;
+  return pRet;
 }
 
-void CPDF_Array::InsertAt(size_t index, CPDF_Object* pObj) {
+CPDF_Object* CPDF_Array::Add(std::unique_ptr<CPDF_Object> pObj) {
   ASSERT(IsArray());
   CHECK(!pObj || pObj->IsInline());
-  if (index >= m_Objects.size()) {
-    // Allocate space first.
-    m_Objects.resize(index + 1, nullptr);
-    m_Objects[index] = pObj;
-  } else {
-    // Directly insert.
-    m_Objects.insert(m_Objects.begin() + index, pObj);
-  }
+  CPDF_Object* pRet = pObj.get();
+  m_Objects.push_back(std::move(pObj));
+  return pRet;
 }
-
-void CPDF_Array::Add(CPDF_Object* pObj) {
-  ASSERT(IsArray());
-  CHECK(!pObj || pObj->IsInline());
-  m_Objects.push_back(pObj);
-}
-
-void CPDF_Array::AddName(const CFX_ByteString& str) {
-  Add(new CPDF_Name(str));
-}
-
-void CPDF_Array::AddString(const CFX_ByteString& str) {
-  Add(new CPDF_String(str, false));
-}
-
-void CPDF_Array::AddInteger(int i) {
-  Add(new CPDF_Number(i));
-}
-
-void CPDF_Array::AddNumber(FX_FLOAT f) {
-  Add(new CPDF_Number(f));
-}
-
-void CPDF_Array::AddReference(CPDF_IndirectObjectHolder* pDoc,
-                              uint32_t objnum) {
-  Add(new CPDF_Reference(pDoc, objnum));
-}
-
-void CPDF_Array::AddReference(CPDF_IndirectObjectHolder* pDoc,
-                              CPDF_Object* pObj) {
-  ASSERT(!pObj->IsInline());
-  Add(new CPDF_Reference(pDoc, pObj->GetObjNum()));
-}