[xfa] Move CJX code into fxjs/xfa

This CL moves the remaining CJX clases into fxjs/xfa so they co-exist
with the rest of the CJX classes.

Change-Id: I2b1e5504ac23f73df177f309967a04ab27fb61d1
Reviewed-on: https://pdfium-review.googlesource.com/20550
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>

1 files changed, 806 insertions, 0 deletions

diff --git a/fxjs/xfa/cjx_object.cpp b/fxjs/xfa/cjx_object.cpp
new file mode 100644
index 0000000000..81ba1ac3d2
--- /dev/null
+++ b/fxjs/xfa/cjx_object.cpp
@@ -0,0 +1,806 @@
+// Copyright 2017 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 "fxjs/xfa/cjx_object.h"
+
+#include <utility>
+
+#include "core/fxcrt/fx_extension.h"
+#include "core/fxcrt/xml/cfx_xmltext.h"
+#include "fxjs/cfxjse_engine.h"
+#include "fxjs/cfxjse_value.h"
+#include "fxjs/cjs_return.h"
+#include "third_party/base/ptr_util.h"
+#include "xfa/fxfa/cxfa_ffnotify.h"
+#include "xfa/fxfa/cxfa_ffwidget.h"
+#include "xfa/fxfa/parser/cxfa_document.h"
+#include "xfa/fxfa/parser/cxfa_measurement.h"
+#include "xfa/fxfa/parser/cxfa_node.h"
+#include "xfa/fxfa/parser/cxfa_object.h"
+
+namespace {
+
+void XFA_DeleteWideString(void* pData) {
+  delete static_cast<WideString*>(pData);
+}
+
+void XFA_CopyWideString(void*& pData) {
+  if (!pData)
+    return;
+  pData = new WideString(*reinterpret_cast<WideString*>(pData));
+}
+
+XFA_MAPDATABLOCKCALLBACKINFO deleteWideStringCallBack = {XFA_DeleteWideString,
+                                                         XFA_CopyWideString};
+
+enum XFA_KEYTYPE {
+  XFA_KEYTYPE_Custom,
+  XFA_KEYTYPE_Element,
+};
+
+void* GetMapKey_Custom(const WideStringView& wsKey) {
+  uint32_t dwKey = FX_HashCode_GetW(wsKey, false);
+  return (void*)(uintptr_t)((dwKey << 1) | XFA_KEYTYPE_Custom);
+}
+
+void* GetMapKey_Element(XFA_Element eType, XFA_Attribute eAttribute) {
+  return (void*)(uintptr_t)((static_cast<uint32_t>(eType) << 16) |
+                            (static_cast<uint32_t>(eAttribute) << 8) |
+                            XFA_KEYTYPE_Element);
+}
+
+void XFA_DefaultFreeData(void* pData) {}
+
+XFA_MAPDATABLOCKCALLBACKINFO gs_XFADefaultFreeData = {XFA_DefaultFreeData,
+                                                      nullptr};
+
+}  // namespace
+
+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;
+};
+
+CJX_Object::CJX_Object(CXFA_Object* obj) : object_(obj) {}
+
+CJX_Object::~CJX_Object() {
+  ClearMapModuleBuffer();
+}
+
+void CJX_Object::DefineMethods(const CJX_MethodSpec method_specs[]) {
+  for (size_t i = 0; method_specs[i].pMethodCall != nullptr; ++i)
+    method_specs_[method_specs[i].pName] = method_specs[i].pMethodCall;
+}
+
+CXFA_Document* CJX_Object::GetDocument() const {
+  return object_->GetDocument();
+}
+
+void CJX_Object::Script_ObjectClass_ClassName(CFXJSE_Value* pValue,
+                                              bool bSetting,
+                                              XFA_Attribute eAttribute) {
+  if (bSetting) {
+    ThrowInvalidPropertyException();
+    return;
+  }
+  pValue->SetString(
+      FX_UTF8Encode(GetXFAObject()->GetClassName()).AsStringView());
+}
+
+bool CJX_Object::HasMethod(const WideString& func) const {
+  return pdfium::ContainsKey(method_specs_, func.UTF8Encode());
+}
+
+CJS_Return CJX_Object::RunMethod(
+    const WideString& func,
+    const std::vector<v8::Local<v8::Value>>& params) {
+  auto it = method_specs_.find(func.UTF8Encode());
+  if (it == method_specs_.end())
+    return CJS_Return(false);
+  return it->second(this, GetXFAObject()->GetDocument()->GetScriptContext(),
+                    params);
+}
+
+void CJX_Object::ThrowInvalidPropertyException() const {
+  ThrowException(L"Invalid property set operation.");
+}
+
+void CJX_Object::ThrowIndexOutOfBoundsException() const {
+  ThrowException(L"Index value is out of bounds.");
+}
+
+void CJX_Object::ThrowParamCountMismatchException(
+    const WideString& method) const {
+  ThrowException(L"Incorrect number of parameters calling method '%.16s'.",
+                 method.c_str());
+}
+
+void CJX_Object::ThrowArgumentMismatchException() const {
+  ThrowException(L"Argument mismatch in property or function argument.");
+}
+
+void CJX_Object::ThrowException(const wchar_t* str, ...) const {
+  va_list arg_ptr;
+  va_start(arg_ptr, str);
+  WideString wsMessage = WideString::FormatV(str, arg_ptr);
+  va_end(arg_ptr);
+
+  ASSERT(!wsMessage.IsEmpty());
+  FXJSE_ThrowMessage(wsMessage.UTF8Encode().AsStringView());
+}
+
+bool CJX_Object::HasAttribute(XFA_Attribute eAttr) {
+  void* pKey = GetMapKey_Element(GetXFAObject()->GetElementType(), eAttr);
+  return HasMapModuleKey(pKey);
+}
+
+bool CJX_Object::SetAttribute(XFA_Attribute eAttr,
+                              const WideStringView& wsValue,
+                              bool bNotify) {
+  switch (ToNode(GetXFAObject())->GetAttributeType(eAttr)) {
+    case XFA_AttributeType::Enum: {
+      pdfium::Optional<XFA_AttributeEnum> item =
+          CXFA_Node::NameToAttributeEnum(wsValue);
+      return SetEnum(
+          eAttr,
+          item ? *item : *(ToNode(GetXFAObject())->GetDefaultEnum(eAttr)),
+          bNotify);
+    }
+    case XFA_AttributeType::CData:
+      return SetCData(eAttr, WideString(wsValue), bNotify, false);
+    case XFA_AttributeType::Boolean:
+      return SetBoolean(eAttr, wsValue != L"0", bNotify);
+    case XFA_AttributeType::Integer:
+      return SetInteger(eAttr,
+                        FXSYS_round(FXSYS_wcstof(wsValue.unterminated_c_str(),
+                                                 wsValue.GetLength(), nullptr)),
+                        bNotify);
+    case XFA_AttributeType::Measure:
+      return SetMeasure(eAttr, CXFA_Measurement(wsValue), bNotify);
+    default:
+      break;
+  }
+  return false;
+}
+
+void CJX_Object::SetMapModuleString(void* pKey, const WideStringView& wsValue) {
+  SetMapModuleBuffer(pKey, (void*)wsValue.unterminated_c_str(),
+                     wsValue.GetLength() * sizeof(wchar_t), nullptr);
+}
+
+bool CJX_Object::SetAttribute(const WideStringView& wsAttr,
+                              const WideStringView& wsValue,
+                              bool bNotify) {
+  XFA_Attribute attr = CXFA_Node::NameToAttribute(wsValue);
+  if (attr != XFA_Attribute::Unknown)
+    return SetAttribute(attr, wsValue, bNotify);
+
+  void* pKey = GetMapKey_Custom(wsAttr);
+  SetMapModuleString(pKey, wsValue);
+  return true;
+}
+
+WideString CJX_Object::GetAttribute(const WideStringView& attr) {
+  return TryAttribute(attr, true).value_or(WideString());
+}
+
+WideString CJX_Object::GetAttribute(XFA_Attribute attr) {
+  return TryAttribute(attr, true).value_or(WideString());
+}
+
+pdfium::Optional<WideString> CJX_Object::TryAttribute(XFA_Attribute eAttr,
+                                                      bool bUseDefault) {
+  switch (ToNode(GetXFAObject())->GetAttributeType(eAttr)) {
+    case XFA_AttributeType::Enum: {
+      pdfium::Optional<XFA_AttributeEnum> value = TryEnum(eAttr, bUseDefault);
+      if (!value)
+        return {};
+
+      return {CXFA_Node::AttributeEnumToName(*value)};
+    }
+    case XFA_AttributeType::CData:
+      return TryCData(eAttr, bUseDefault);
+
+    case XFA_AttributeType::Boolean: {
+      pdfium::Optional<bool> value = TryBoolean(eAttr, bUseDefault);
+      if (!value)
+        return {};
+      return {*value ? L"1" : L"0"};
+    }
+    case XFA_AttributeType::Integer: {
+      pdfium::Optional<int32_t> iValue = TryInteger(eAttr, bUseDefault);
+      if (!iValue)
+        return {};
+      return {WideString::Format(L"%d", *iValue)};
+    }
+    case XFA_AttributeType::Measure: {
+      pdfium::Optional<CXFA_Measurement> value = TryMeasure(eAttr, bUseDefault);
+      if (!value)
+        return {};
+
+      return {value->ToString()};
+    }
+    default:
+      break;
+  }
+  return {};
+}
+
+pdfium::Optional<WideString> CJX_Object::TryAttribute(
+    const WideStringView& wsAttr,
+    bool bUseDefault) {
+  XFA_Attribute attr = CXFA_Node::NameToAttribute(wsAttr);
+  if (attr != XFA_Attribute::Unknown)
+    return TryAttribute(attr, bUseDefault);
+
+  void* pKey = GetMapKey_Custom(wsAttr);
+  WideStringView wsValueC;
+  if (!GetMapModuleString(pKey, wsValueC))
+    return {};
+
+  return {WideString(wsValueC)};
+}
+
+void CJX_Object::RemoveAttribute(const WideStringView& wsAttr) {
+  void* pKey = GetMapKey_Custom(wsAttr);
+  if (pKey)
+    RemoveMapModuleKey(pKey);
+}
+
+pdfium::Optional<bool> CJX_Object::TryBoolean(XFA_Attribute eAttr,
+                                              bool bUseDefault) {
+  void* pValue = nullptr;
+  void* pKey = GetMapKey_Element(GetXFAObject()->GetElementType(), eAttr);
+  if (GetMapModuleValue(pKey, pValue))
+    return {!!pValue};
+  if (!bUseDefault)
+    return {};
+
+  return ToNode(GetXFAObject())->GetDefaultBoolean(eAttr);
+}
+
+bool CJX_Object::SetBoolean(XFA_Attribute eAttr, bool bValue, bool bNotify) {
+  CFX_XMLElement* elem = SetValue(eAttr, XFA_AttributeType::Boolean,
+                                  (void*)(uintptr_t)bValue, bNotify);
+  if (elem)
+    elem->SetString(CXFA_Node::AttributeToName(eAttr), bValue ? L"1" : L"0");
+  return true;
+}
+
+bool CJX_Object::GetBoolean(XFA_Attribute eAttr) {
+  return TryBoolean(eAttr, true).value_or(false);
+}
+
+bool CJX_Object::SetInteger(XFA_Attribute eAttr, int32_t iValue, bool bNotify) {
+  CFX_XMLElement* elem = SetValue(eAttr, XFA_AttributeType::Integer,
+                                  (void*)(uintptr_t)iValue, bNotify);
+  if (elem) {
+    elem->SetString(CXFA_Node::AttributeToName(eAttr),
+                    WideString::Format(L"%d", iValue));
+  }
+  return true;
+}
+
+int32_t CJX_Object::GetInteger(XFA_Attribute eAttr) {
+  return TryInteger(eAttr, true).value_or(0);
+}
+
+pdfium::Optional<int32_t> CJX_Object::TryInteger(XFA_Attribute eAttr,
+                                                 bool bUseDefault) {
+  void* pKey = GetMapKey_Element(GetXFAObject()->GetElementType(), eAttr);
+  void* pValue = nullptr;
+  if (GetMapModuleValue(pKey, pValue))
+    return {static_cast<int32_t>(reinterpret_cast<uintptr_t>(pValue))};
+  if (!bUseDefault)
+    return {};
+
+  return ToNode(GetXFAObject())->GetDefaultInteger(eAttr);
+}
+
+pdfium::Optional<XFA_AttributeEnum> CJX_Object::TryEnum(XFA_Attribute eAttr,
+                                                        bool bUseDefault) {
+  void* pKey = GetMapKey_Element(GetXFAObject()->GetElementType(), eAttr);
+  void* pValue = nullptr;
+  if (GetMapModuleValue(pKey, pValue)) {
+    return {
+        static_cast<XFA_AttributeEnum>(reinterpret_cast<uintptr_t>(pValue))};
+  }
+  if (!bUseDefault)
+    return {};
+
+  return ToNode(GetXFAObject())->GetDefaultEnum(eAttr);
+}
+
+bool CJX_Object::SetEnum(XFA_Attribute eAttr,
+                         XFA_AttributeEnum eValue,
+                         bool bNotify) {
+  CFX_XMLElement* elem = SetValue(eAttr, XFA_AttributeType::Enum,
+                                  (void*)(uintptr_t)eValue, bNotify);
+  if (elem) {
+    elem->SetString(CXFA_Node::AttributeToName(eAttr),
+                    CXFA_Node::AttributeEnumToName(eValue));
+  }
+  return true;
+}
+
+XFA_AttributeEnum CJX_Object::GetEnum(XFA_Attribute eAttr) {
+  return TryEnum(eAttr, true).value_or(XFA_AttributeEnum::Unknown);
+}
+
+bool CJX_Object::SetMeasure(XFA_Attribute eAttr,
+                            CXFA_Measurement mValue,
+                            bool bNotify) {
+  void* pKey = GetMapKey_Element(GetXFAObject()->GetElementType(), eAttr);
+  OnChanging(eAttr, bNotify);
+  SetMapModuleBuffer(pKey, &mValue, sizeof(CXFA_Measurement), nullptr);
+  OnChanged(eAttr, bNotify, false);
+  return true;
+}
+
+pdfium::Optional<CXFA_Measurement> CJX_Object::TryMeasure(
+    XFA_Attribute eAttr,
+    bool bUseDefault) const {
+  void* pKey = GetMapKey_Element(GetXFAObject()->GetElementType(), eAttr);
+  void* pValue;
+  int32_t iBytes;
+  if (GetMapModuleBuffer(pKey, pValue, iBytes, true) &&
+      iBytes == sizeof(CXFA_Measurement)) {
+    return {*reinterpret_cast<CXFA_Measurement*>(pValue)};
+  }
+  if (!bUseDefault)
+    return {};
+
+  return ToNode(GetXFAObject())->GetDefaultMeasurement(eAttr);
+}
+
+CXFA_Measurement CJX_Object::GetMeasure(XFA_Attribute eAttr) const {
+  return TryMeasure(eAttr, true).value_or(CXFA_Measurement());
+}
+
+WideString CJX_Object::GetCData(XFA_Attribute eAttr) {
+  return TryCData(eAttr, true).value_or(WideString());
+}
+
+bool CJX_Object::SetCData(XFA_Attribute eAttr,
+                          const WideString& wsValue,
+                          bool bNotify,
+                          bool bScriptModify) {
+  void* pKey = GetMapKey_Element(GetXFAObject()->GetElementType(), eAttr);
+  OnChanging(eAttr, bNotify);
+  if (eAttr == XFA_Attribute::Value) {
+    WideString* pClone = new WideString(wsValue);
+    SetUserData(pKey, pClone, &deleteWideStringCallBack);
+  } else {
+    SetMapModuleString(pKey, wsValue.AsStringView());
+    if (eAttr == XFA_Attribute::Name)
+      ToNode(GetXFAObject())->UpdateNameHash();
+  }
+  OnChanged(eAttr, bNotify, bScriptModify);
+
+  if (!ToNode(GetXFAObject())->IsNeedSavingXMLNode() ||
+      eAttr == XFA_Attribute::QualifiedName ||
+      eAttr == XFA_Attribute::BindingNode) {
+    return true;
+  }
+
+  if (eAttr == XFA_Attribute::Name &&
+      (GetXFAObject()->GetElementType() == XFA_Element::DataValue ||
+       GetXFAObject()->GetElementType() == XFA_Element::DataGroup)) {
+    return true;
+  }
+
+  auto* elem =
+      static_cast<CFX_XMLElement*>(ToNode(GetXFAObject())->GetXMLMappingNode());
+  if (eAttr == XFA_Attribute::Value) {
+    FX_XMLNODETYPE eXMLType = elem->GetType();
+    switch (eXMLType) {
+      case FX_XMLNODE_Element:
+        if (ToNode(GetXFAObject())->IsAttributeInXML()) {
+          elem->SetString(WideString(GetCData(XFA_Attribute::QualifiedName)),
+                          wsValue);
+        } else {
+          bool bDeleteChildren = true;
+          if (ToNode(GetXFAObject())->GetPacketType() ==
+              XFA_PacketType::Datasets) {
+            for (CXFA_Node* pChildDataNode =
+                     ToNode(GetXFAObject())
+                         ->GetNodeItem(XFA_NODEITEM_FirstChild);
+                 pChildDataNode; pChildDataNode = pChildDataNode->GetNodeItem(
+                                     XFA_NODEITEM_NextSibling)) {
+              if (!pChildDataNode->GetBindItems()->empty()) {
+                bDeleteChildren = false;
+                break;
+              }
+            }
+          }
+          if (bDeleteChildren)
+            elem->DeleteChildren();
+
+          elem->SetTextData(wsValue);
+        }
+        break;
+      case FX_XMLNODE_Text:
+        static_cast<CFX_XMLText*>(ToNode(GetXFAObject())->GetXMLMappingNode())
+            ->SetText(wsValue);
+        break;
+      default:
+        NOTREACHED();
+    }
+    return true;
+  }
+  ASSERT(elem->GetType() == FX_XMLNODE_Element);
+
+  WideString wsAttrName = CXFA_Node::AttributeToName(eAttr);
+  if (eAttr == XFA_Attribute::ContentType)
+    wsAttrName = L"xfa:" + wsAttrName;
+
+  elem->SetString(wsAttrName, wsValue);
+  return true;
+}
+
+void CJX_Object::SetAttributeValue(const WideString& wsValue,
+                                   const WideString& wsXMLValue,
+                                   bool bNotify,
+                                   bool bScriptModify) {
+  void* pKey =
+      GetMapKey_Element(GetXFAObject()->GetElementType(), XFA_Attribute::Value);
+  OnChanging(XFA_Attribute::Value, bNotify);
+  WideString* pClone = new WideString(wsValue);
+  SetUserData(pKey, pClone, &deleteWideStringCallBack);
+  OnChanged(XFA_Attribute::Value, bNotify, bScriptModify);
+  if (!ToNode(GetXFAObject())->IsNeedSavingXMLNode())
+    return;
+
+  auto* elem =
+      static_cast<CFX_XMLElement*>(ToNode(GetXFAObject())->GetXMLMappingNode());
+  FX_XMLNODETYPE eXMLType = elem->GetType();
+  switch (eXMLType) {
+    case FX_XMLNODE_Element:
+      if (ToNode(GetXFAObject())->IsAttributeInXML()) {
+        elem->SetString(WideString(GetCData(XFA_Attribute::QualifiedName)),
+                        wsXMLValue);
+      } else {
+        bool bDeleteChildren = true;
+        if (ToNode(GetXFAObject())->GetPacketType() ==
+            XFA_PacketType::Datasets) {
+          for (CXFA_Node* pChildDataNode =
+                   ToNode(GetXFAObject())->GetNodeItem(XFA_NODEITEM_FirstChild);
+               pChildDataNode; pChildDataNode = pChildDataNode->GetNodeItem(
+                                   XFA_NODEITEM_NextSibling)) {
+            if (!pChildDataNode->GetBindItems()->empty()) {
+              bDeleteChildren = false;
+              break;
+            }
+          }
+        }
+        if (bDeleteChildren)
+          elem->DeleteChildren();
+
+        elem->SetTextData(wsXMLValue);
+      }
+      break;
+    case FX_XMLNODE_Text:
+      static_cast<CFX_XMLText*>(ToNode(GetXFAObject())->GetXMLMappingNode())
+          ->SetText(wsXMLValue);
+      break;
+    default:
+      ASSERT(0);
+  }
+}
+
+pdfium::Optional<WideString> CJX_Object::TryCData(XFA_Attribute eAttr,
+                                                  bool bUseDefault) {
+  void* pKey = GetMapKey_Element(GetXFAObject()->GetElementType(), eAttr);
+  if (eAttr == XFA_Attribute::Value) {
+    void* pData;
+    int32_t iBytes = 0;
+    WideString* pStr = nullptr;
+    if (GetMapModuleBuffer(pKey, pData, iBytes, true) &&
+        iBytes == sizeof(void*)) {
+      memcpy(&pData, pData, iBytes);
+      pStr = reinterpret_cast<WideString*>(pData);
+    }
+    if (pStr)
+      return {*pStr};
+  } else {
+    WideStringView wsValueC;
+    if (GetMapModuleString(pKey, wsValueC))
+      return {WideString(wsValueC)};
+  }
+  if (!bUseDefault)
+    return {};
+
+  return ToNode(GetXFAObject())->GetDefaultCData(eAttr);
+}
+
+CFX_XMLElement* CJX_Object::SetValue(XFA_Attribute eAttr,
+                                     XFA_AttributeType eType,
+                                     void* pValue,
+                                     bool bNotify) {
+  void* pKey = GetMapKey_Element(GetXFAObject()->GetElementType(), eAttr);
+  OnChanging(eAttr, bNotify);
+  SetMapModuleValue(pKey, pValue);
+  OnChanged(eAttr, bNotify, false);
+  if (!ToNode(GetXFAObject())->IsNeedSavingXMLNode())
+    return nullptr;
+
+  auto* elem =
+      static_cast<CFX_XMLElement*>(ToNode(GetXFAObject())->GetXMLMappingNode());
+  ASSERT(elem->GetType() == FX_XMLNODE_Element);
+
+  return elem;
+}
+
+bool CJX_Object::SetUserData(void* pKey,
+                             void* pData,
+                             XFA_MAPDATABLOCKCALLBACKINFO* pCallbackInfo) {
+  SetMapModuleBuffer(pKey, &pData, sizeof(void*),
+                     pCallbackInfo ? pCallbackInfo : &gs_XFADefaultFreeData);
+  return true;
+}
+
+XFA_MAPMODULEDATA* CJX_Object::CreateMapModuleData() {
+  if (!map_module_data_)
+    map_module_data_ = pdfium::MakeUnique<XFA_MAPMODULEDATA>();
+  return map_module_data_.get();
+}
+
+XFA_MAPMODULEDATA* CJX_Object::GetMapModuleData() const {
+  return map_module_data_.get();
+}
+
+void CJX_Object::SetMapModuleValue(void* pKey, void* pValue) {
+  CreateMapModuleData()->m_ValueMap[pKey] = pValue;
+}
+
+bool CJX_Object::GetMapModuleValue(void* pKey, void*& pValue) {
+  for (CXFA_Node* pNode = ToNode(GetXFAObject()); pNode;
+       pNode = pNode->GetTemplateNode()) {
+    XFA_MAPMODULEDATA* pModule = pNode->JSNode()->GetMapModuleData();
+    if (pModule) {
+      auto it = pModule->m_ValueMap.find(pKey);
+      if (it != pModule->m_ValueMap.end()) {
+        pValue = it->second;
+        return true;
+      }
+    }
+    if (pNode->GetPacketType() == XFA_PacketType::Datasets)
+      break;
+  }
+  return false;
+}
+
+bool CJX_Object::GetMapModuleString(void* pKey, WideStringView& wsValue) {
+  void* pValue;
+  int32_t iBytes;
+  if (!GetMapModuleBuffer(pKey, pValue, iBytes, true))
+    return false;
+
+  // Defensive measure: no out-of-bounds pointers even if zero length.
+  int32_t iChars = iBytes / sizeof(wchar_t);
+  wsValue = WideStringView(iChars ? (const wchar_t*)pValue : nullptr, iChars);
+  return true;
+}
+
+void CJX_Object::SetMapModuleBuffer(
+    void* pKey,
+    void* pValue,
+    int32_t iBytes,
+    XFA_MAPDATABLOCKCALLBACKINFO* pCallbackInfo) {
+  XFA_MAPDATABLOCK*& pBuffer = CreateMapModuleData()->m_BufferMap[pKey];
+  if (!pBuffer) {
+    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 = reinterpret_cast<XFA_MAPDATABLOCK*>(
+        FX_Realloc(uint8_t, pBuffer, sizeof(XFA_MAPDATABLOCK) + iBytes));
+  } else if (pBuffer->pCallbackInfo && pBuffer->pCallbackInfo->pFree) {
+    pBuffer->pCallbackInfo->pFree(
+        *reinterpret_cast<void**>(pBuffer->GetData()));
+  }
+  if (!pBuffer)
+    return;
+
+  pBuffer->pCallbackInfo = pCallbackInfo;
+  pBuffer->iBytes = iBytes;
+  memcpy(pBuffer->GetData(), pValue, iBytes);
+}
+
+bool CJX_Object::GetMapModuleBuffer(void* pKey,
+                                    void*& pValue,
+                                    int32_t& iBytes,
+                                    bool bProtoAlso) const {
+  XFA_MAPDATABLOCK* pBuffer = nullptr;
+  for (const CXFA_Node* pNode = ToNode(GetXFAObject()); pNode;
+       pNode = pNode->GetTemplateNode()) {
+    XFA_MAPMODULEDATA* pModule = pNode->JSNode()->GetMapModuleData();
+    if (pModule) {
+      auto it = pModule->m_BufferMap.find(pKey);
+      if (it != pModule->m_BufferMap.end()) {
+        pBuffer = it->second;
+        break;
+      }
+    }
+    if (!bProtoAlso || pNode->GetPacketType() == XFA_PacketType::Datasets)
+      break;
+  }
+  if (!pBuffer)
+    return false;
+
+  pValue = pBuffer->GetData();
+  iBytes = pBuffer->iBytes;
+  return true;
+}
+
+bool CJX_Object::HasMapModuleKey(void* pKey) {
+  XFA_MAPMODULEDATA* pModule = GetMapModuleData();
+  return pModule && (pdfium::ContainsKey(pModule->m_ValueMap, pKey) ||
+                     pdfium::ContainsKey(pModule->m_BufferMap, pKey));
+}
+
+void CJX_Object::ClearMapModuleBuffer() {
+  XFA_MAPMODULEDATA* pModule = GetMapModuleData();
+  if (!pModule)
+    return;
+
+  for (auto& pair : pModule->m_BufferMap) {
+    XFA_MAPDATABLOCK* pBuffer = pair.second;
+    if (pBuffer) {
+      if (pBuffer->pCallbackInfo && pBuffer->pCallbackInfo->pFree)
+        pBuffer->pCallbackInfo->pFree(*(void**)pBuffer->GetData());
+
+      FX_Free(pBuffer);
+    }
+  }
+  pModule->m_BufferMap.clear();
+  pModule->m_ValueMap.clear();
+}
+
+void CJX_Object::RemoveMapModuleKey(void* pKey) {
+  ASSERT(pKey);
+
+  XFA_MAPMODULEDATA* pModule = GetMapModuleData();
+  if (!pModule)
+    return;
+
+  auto it = pModule->m_BufferMap.find(pKey);
+  if (it != pModule->m_BufferMap.end()) {
+    XFA_MAPDATABLOCK* pBuffer = it->second;
+    if (pBuffer) {
+      if (pBuffer->pCallbackInfo && pBuffer->pCallbackInfo->pFree)
+        pBuffer->pCallbackInfo->pFree(*(void**)pBuffer->GetData());
+
+      FX_Free(pBuffer);
+    }
+    pModule->m_BufferMap.erase(it);
+  }
+  pModule->m_ValueMap.erase(pKey);
+  return;
+}
+
+void CJX_Object::MergeAllData(CXFA_Object* pDstModule) {
+  XFA_MAPMODULEDATA* pDstModuleData =
+      ToNode(pDstModule)->JSNode()->CreateMapModuleData();
+  XFA_MAPMODULEDATA* pSrcModuleData = GetMapModuleData();
+  if (!pSrcModuleData)
+    return;
+
+  for (const auto& pair : pSrcModuleData->m_ValueMap)
+    pDstModuleData->m_ValueMap[pair.first] = pair.second;
+
+  for (const auto& pair : pSrcModuleData->m_BufferMap) {
+    XFA_MAPDATABLOCK* pSrcBuffer = pair.second;
+    XFA_MAPDATABLOCK*& pDstBuffer = pDstModuleData->m_BufferMap[pair.first];
+    if (pSrcBuffer->pCallbackInfo && pSrcBuffer->pCallbackInfo->pFree &&
+        !pSrcBuffer->pCallbackInfo->pCopy) {
+      if (pDstBuffer) {
+        pDstBuffer->pCallbackInfo->pFree(*(void**)pDstBuffer->GetData());
+        pDstModuleData->m_BufferMap.erase(pair.first);
+      }
+      continue;
+    }
+    if (!pDstBuffer) {
+      pDstBuffer = (XFA_MAPDATABLOCK*)FX_Alloc(
+          uint8_t, sizeof(XFA_MAPDATABLOCK) + pSrcBuffer->iBytes);
+    } else if (pDstBuffer->iBytes != pSrcBuffer->iBytes) {
+      if (pDstBuffer->pCallbackInfo && pDstBuffer->pCallbackInfo->pFree) {
+        pDstBuffer->pCallbackInfo->pFree(*(void**)pDstBuffer->GetData());
+      }
+      pDstBuffer = (XFA_MAPDATABLOCK*)FX_Realloc(
+          uint8_t, pDstBuffer, sizeof(XFA_MAPDATABLOCK) + pSrcBuffer->iBytes);
+    } else if (pDstBuffer->pCallbackInfo && pDstBuffer->pCallbackInfo->pFree) {
+      pDstBuffer->pCallbackInfo->pFree(*(void**)pDstBuffer->GetData());
+    }
+    if (!pDstBuffer)
+      continue;
+
+    pDstBuffer->pCallbackInfo = pSrcBuffer->pCallbackInfo;
+    pDstBuffer->iBytes = pSrcBuffer->iBytes;
+    memcpy(pDstBuffer->GetData(), pSrcBuffer->GetData(), pSrcBuffer->iBytes);
+    if (pDstBuffer->pCallbackInfo && pDstBuffer->pCallbackInfo->pCopy) {
+      pDstBuffer->pCallbackInfo->pCopy(*(void**)pDstBuffer->GetData());
+    }
+  }
+}
+
+void CJX_Object::MoveBufferMapData(CXFA_Object* pDstModule) {
+  if (!pDstModule)
+    return;
+
+  bool bNeedMove = true;
+  if (pDstModule->GetElementType() != GetXFAObject()->GetElementType())
+    bNeedMove = false;
+
+  if (bNeedMove)
+    ToNode(pDstModule)->JSNode()->SetCalcData(ReleaseCalcData());
+  if (!pDstModule->IsNodeV())
+    return;
+
+  WideString wsValue = ToNode(pDstModule)->JSNode()->GetContent(false);
+  WideString wsFormatValue(wsValue);
+  CXFA_WidgetData* pWidgetData = ToNode(pDstModule)->GetContainerWidgetData();
+  if (pWidgetData)
+    wsFormatValue = pWidgetData->GetFormatDataValue(wsValue);
+
+  ToNode(pDstModule)
+      ->JSNode()
+      ->SetContent(wsValue, wsFormatValue, true, true, true);
+}
+
+void CJX_Object::MoveBufferMapData(CXFA_Object* pSrcModule,
+                                   CXFA_Object* pDstModule) {
+  if (!pSrcModule || !pDstModule)
+    return;
+
+  CXFA_Node* pSrcChild =
+      ToNode(pSrcModule)->GetNodeItem(XFA_NODEITEM_FirstChild);
+  CXFA_Node* pDstChild =
+      ToNode(pDstModule)->GetNodeItem(XFA_NODEITEM_FirstChild);
+  while (pSrcChild && pDstChild) {
+    MoveBufferMapData(pSrcChild, pDstChild);
+
+    pSrcChild = pSrcChild->GetNodeItem(XFA_NODEITEM_NextSibling);
+    pDstChild = pDstChild->GetNodeItem(XFA_NODEITEM_NextSibling);
+  }
+  ToNode(pSrcModule)->JSNode()->MoveBufferMapData(pDstModule);
+}
+
+void CJX_Object::OnChanging(XFA_Attribute eAttr, bool bNotify) {
+  if (!bNotify || !ToNode(GetXFAObject())->IsInitialized())
+    return;
+
+  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
+  if (pNotify)
+    pNotify->OnValueChanging(ToNode(GetXFAObject()), eAttr);
+}
+
+void CJX_Object::OnChanged(XFA_Attribute eAttr,
+                           bool bNotify,
+                           bool bScriptModify) {
+  if (bNotify && ToNode(GetXFAObject())->IsInitialized())
+    ToNode(GetXFAObject())->SendAttributeChangeMessage(eAttr, bScriptModify);
+}
+
+void CJX_Object::SetCalcData(std::unique_ptr<CXFA_CalcData> data) {
+  calc_data_ = std::move(data);
+}
+
+std::unique_ptr<CXFA_CalcData> CJX_Object::ReleaseCalcData() {
+  return std::move(calc_data_);
+}