From b1a3044cdcd99ab4c88927e8b840c0c712ae54e3 Mon Sep 17 00:00:00 2001
From: Dan Sinclair <dsinclair@chromium.org>
Date: Mon, 6 Nov 2017 14:53:21 +0000
Subject: Make XFA_MAPMODULESDATA a unique_ptr

Change-Id: Icd72ee8d098fa0140119519f7079745bd5280a84
Reviewed-on: https://pdfium-review.googlesource.com/17592
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
---
 fxjs/cjx_node.cpp | 48 ++++++++++++++++++++++++++++--------------------
 fxjs/cjx_node.h   | 22 +++++-----------------
 2 files changed, 33 insertions(+), 37 deletions(-)

diff --git a/fxjs/cjx_node.cpp b/fxjs/cjx_node.cpp
index e653795a4b..945b12f868 100644
--- a/fxjs/cjx_node.cpp
+++ b/fxjs/cjx_node.cpp
@@ -6,7 +6,7 @@
 
 #include "fxjs/cjx_node.h"
 
-#include <memory>
+#include <map>
 #include <vector>
 
 #include "core/fxcrt/cfx_decimal.h"
@@ -172,12 +172,22 @@ static void XFA_DefaultFreeData(void* pData) {}
 static XFA_MAPDATABLOCKCALLBACKINFO gs_XFADefaultFreeData = {
     XFA_DefaultFreeData, nullptr};
 
-XFA_MAPMODULEDATA::XFA_MAPMODULEDATA() {}
+struct XFA_MAPDATABLOCK {
+  uint8_t* GetData() const { return (uint8_t*)this + sizeof(XFA_MAPDATABLOCK); }
 
-XFA_MAPMODULEDATA::~XFA_MAPMODULEDATA() {}
+  XFA_MAPDATABLOCKCALLBACKINFO* pCallbackInfo;
+  int32_t iBytes;
+};
+
+struct XFA_MAPMODULEDATA {
+  XFA_MAPMODULEDATA() {}
+  ~XFA_MAPMODULEDATA() {}
+
+  std::map<void*, void*> m_ValueMap;
+  std::map<void*, XFA_MAPDATABLOCK*> m_BufferMap;
+};
 
-CJX_Node::CJX_Node(CXFA_Node* node)
-    : CJX_Object(node), map_module_data_(nullptr) {}
+CJX_Node::CJX_Node(CXFA_Node* node) : CJX_Object(node) {}
 
 CJX_Node::~CJX_Node() {
   ClearMapModuleBuffer();
@@ -3663,17 +3673,16 @@ CXFA_Node* CJX_Node::GetProperty(int32_t index,
 
 XFA_MAPMODULEDATA* CJX_Node::CreateMapModuleData() {
   if (!map_module_data_)
-    map_module_data_ = new XFA_MAPMODULEDATA;
-  return map_module_data_;
+    map_module_data_ = pdfium::MakeUnique<XFA_MAPMODULEDATA>();
+  return map_module_data_.get();
 }
 
 XFA_MAPMODULEDATA* CJX_Node::GetMapModuleData() const {
-  return map_module_data_;
+  return map_module_data_.get();
 }
 
 void CJX_Node::SetMapModuleValue(void* pKey, void* pValue) {
-  XFA_MAPMODULEDATA* pModule = CreateMapModuleData();
-  pModule->m_ValueMap[pKey] = pValue;
+  CreateMapModuleData()->m_ValueMap[pKey] = pValue;
 }
 
 bool CJX_Node::GetMapModuleValue(void* pKey, void*& pValue) {
@@ -3713,19 +3722,19 @@ void CJX_Node::SetMapModuleBuffer(void* pKey,
                                   void* pValue,
                                   int32_t iBytes,
                                   XFA_MAPDATABLOCKCALLBACKINFO* pCallbackInfo) {
-  XFA_MAPMODULEDATA* pModule = CreateMapModuleData();
-  XFA_MAPDATABLOCK*& pBuffer = pModule->m_BufferMap[pKey];
+  XFA_MAPDATABLOCK*& pBuffer = CreateMapModuleData()->m_BufferMap[pKey];
   if (!pBuffer) {
-    pBuffer =
-        (XFA_MAPDATABLOCK*)FX_Alloc(uint8_t, sizeof(XFA_MAPDATABLOCK) + iBytes);
+    pBuffer = reinterpret_cast<XFA_MAPDATABLOCK*>(
+        FX_Alloc(uint8_t, sizeof(XFA_MAPDATABLOCK) + iBytes));
   } else if (pBuffer->iBytes != iBytes) {
     if (pBuffer->pCallbackInfo && pBuffer->pCallbackInfo->pFree) {
       pBuffer->pCallbackInfo->pFree(*(void**)pBuffer->GetData());
     }
-    pBuffer = (XFA_MAPDATABLOCK*)FX_Realloc(uint8_t, pBuffer,
-                                            sizeof(XFA_MAPDATABLOCK) + iBytes);
+    pBuffer = reinterpret_cast<XFA_MAPDATABLOCK*>(
+        FX_Realloc(uint8_t, pBuffer, sizeof(XFA_MAPDATABLOCK) + iBytes));
   } else if (pBuffer->pCallbackInfo && pBuffer->pCallbackInfo->pFree) {
-    pBuffer->pCallbackInfo->pFree(*(void**)pBuffer->GetData());
+    pBuffer->pCallbackInfo->pFree(
+        *reinterpret_cast<void**>(pBuffer->GetData()));
   }
   if (!pBuffer)
     return;
@@ -3782,7 +3791,6 @@ void CJX_Node::ClearMapModuleBuffer() {
   }
   pModule->m_BufferMap.clear();
   pModule->m_ValueMap.clear();
-  delete pModule;
 }
 
 void CJX_Node::RemoveMapModuleKey(void* pKey) {
@@ -3806,9 +3814,9 @@ void CJX_Node::RemoveMapModuleKey(void* pKey) {
   return;
 }
 
-void CJX_Node::MergeAllData(void* pDstModule) {
+void CJX_Node::MergeAllData(CXFA_Node* pDstModule) {
   XFA_MAPMODULEDATA* pDstModuleData =
-      static_cast<CXFA_Node*>(pDstModule)->JSNode()->CreateMapModuleData();
+      pDstModule->JSNode()->CreateMapModuleData();
   XFA_MAPMODULEDATA* pSrcModuleData = GetMapModuleData();
   if (!pSrcModuleData)
     return;
diff --git a/fxjs/cjx_node.h b/fxjs/cjx_node.h
index 80ee6ae4b2..a8b579c399 100644
--- a/fxjs/cjx_node.h
+++ b/fxjs/cjx_node.h
@@ -7,7 +7,7 @@
 #ifndef FXJS_CJX_NODE_H_
 #define FXJS_CJX_NODE_H_
 
-#include <map>
+#include <memory>
 
 #include "core/fxcrt/unowned_ptr.h"
 #include "fxjs/cjx_object.h"
@@ -21,20 +21,6 @@ struct XFA_MAPDATABLOCKCALLBACKINFO {
   PD_CALLBACK_DUPLICATEDATA pCopy;
 };
 
-struct XFA_MAPDATABLOCK {
-  uint8_t* GetData() const { return (uint8_t*)this + sizeof(XFA_MAPDATABLOCK); }
-  XFA_MAPDATABLOCKCALLBACKINFO* pCallbackInfo;
-  int32_t iBytes;
-};
-
-struct XFA_MAPMODULEDATA {
-  XFA_MAPMODULEDATA();
-  ~XFA_MAPMODULEDATA();
-
-  std::map<void*, void*> m_ValueMap;
-  std::map<void*, XFA_MAPDATABLOCK*> m_BufferMap;
-};
-
 enum XFA_SOM_MESSAGETYPE {
   XFA_SOM_ValidationMessage,
   XFA_SOM_FormatMessage,
@@ -44,6 +30,8 @@ enum XFA_SOM_MESSAGETYPE {
 class CFXJSE_Arguments;
 class CXFA_Node;
 
+struct XFA_MAPMODULEDATA;
+
 class CJX_Node : public CJX_Object {
  public:
   explicit CJX_Node(CXFA_Node* node);
@@ -123,7 +111,7 @@ class CJX_Node : public CJX_Object {
 
   bool TryNamespace(WideString& wsNamespace);
 
-  void MergeAllData(void* pDstModule);
+  void MergeAllData(CXFA_Node* pDstModule);
 
   void ThrowMissingPropertyException(const WideString& obj,
                                      const WideString& prop) const;
@@ -453,7 +441,7 @@ class CJX_Node : public CJX_Object {
   int32_t execSingleEventByName(const WideStringView& wsEventName,
                                 XFA_Element eType);
 
-  XFA_MAPMODULEDATA* map_module_data_;
+  std::unique_ptr<XFA_MAPMODULEDATA> map_module_data_;
 };
 
 #endif  // FXJS_CJX_NODE_H_
-- 
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