diff --git a/BUILD.gn b/BUILD.gn
index fa879d3..542ae1b 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -809,6 +809,8 @@
 
   if (pdf_enable_xfa) {
     sources += [
+      "core/fxcrt/cfx_blockbuffer.cpp",
+      "core/fxcrt/cfx_blockbuffer.h",
       "core/fxcrt/cfx_char.cpp",
       "core/fxcrt/cfx_char.h",
       "core/fxcrt/cfx_chariter.cpp",
@@ -1402,11 +1404,23 @@
       "xfa/fde/ifde_txtedtdorecord.h",
       "xfa/fde/ifde_txtedtengine.h",
       "xfa/fde/ifde_txtedtpage.h",
-      "xfa/fde/xml/cfde_xml_parser.cpp",
-      "xfa/fde/xml/cfde_xml_parser.h",
-      "xfa/fde/xml/fde_xml.h",
-      "xfa/fde/xml/fde_xml_imp.cpp",
-      "xfa/fde/xml/fde_xml_imp.h",
+      "xfa/fde/xml/cfde_xmlchardata.cpp",
+      "xfa/fde/xml/cfde_xmlchardata.h",
+      "xfa/fde/xml/cfde_xmldeclaration.h",
+      "xfa/fde/xml/cfde_xmldoc.cpp",
+      "xfa/fde/xml/cfde_xmldoc.h",
+      "xfa/fde/xml/cfde_xmlelement.cpp",
+      "xfa/fde/xml/cfde_xmlelement.h",
+      "xfa/fde/xml/cfde_xmlinstruction.cpp",
+      "xfa/fde/xml/cfde_xmlinstruction.h",
+      "xfa/fde/xml/cfde_xmlnode.cpp",
+      "xfa/fde/xml/cfde_xmlnode.h",
+      "xfa/fde/xml/cfde_xmlparser.cpp",
+      "xfa/fde/xml/cfde_xmlparser.h",
+      "xfa/fde/xml/cfde_xmlsyntaxparser.cpp",
+      "xfa/fde/xml/cfde_xmlsyntaxparser.h",
+      "xfa/fde/xml/cfde_xmltext.cpp",
+      "xfa/fde/xml/cfde_xmltext.h",
       "xfa/fgas/crt/cfgas_formatstring.cpp",
       "xfa/fgas/crt/cfgas_formatstring.h",
       "xfa/fgas/crt/fgas_codepage.cpp",
@@ -1873,7 +1887,7 @@
       "xfa/fde/css/cfde_cssdeclaration_unittest.cpp",
       "xfa/fde/css/cfde_cssstylesheet_unittest.cpp",
       "xfa/fde/css/cfde_cssvaluelistparser_unittest.cpp",
-      "xfa/fde/xml/fde_xml_imp_unittest.cpp",
+      "xfa/fde/xml/cfde_xmlsyntaxparser_unittest.cpp",
       "xfa/fgas/layout/fgas_rtfbreak_unittest.cpp",
       "xfa/fxfa/app/cxfa_textparser_unittest.cpp",
       "xfa/fxfa/cxfa_ffapp_unitest.cpp",
diff --git a/core/fxcrt/cfx_blockbuffer.cpp b/core/fxcrt/cfx_blockbuffer.cpp
new file mode 100644
index 0000000..354f415
--- /dev/null
+++ b/core/fxcrt/cfx_blockbuffer.cpp
@@ -0,0 +1,140 @@
+// 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 "core/fxcrt/cfx_blockbuffer.h"
+
+#include <algorithm>
+
+#include "third_party/base/stl_util.h"
+
+CFX_BlockBuffer::CFX_BlockBuffer(int32_t iAllocStep)
+    : m_iDataLength(0),
+      m_iBufferSize(0),
+      m_iAllocStep(iAllocStep),
+      m_iStartPosition(0) {}
+
+CFX_BlockBuffer::~CFX_BlockBuffer() {
+  ClearBuffer();
+}
+
+wchar_t* CFX_BlockBuffer::GetAvailableBlock(int32_t& iIndexInBlock) {
+  iIndexInBlock = 0;
+  if (m_BlockArray.empty())
+    return nullptr;
+
+  int32_t iRealIndex = m_iStartPosition + m_iDataLength;
+  if (iRealIndex == m_iBufferSize) {
+    m_BlockArray.emplace_back(FX_Alloc(wchar_t, m_iAllocStep));
+    m_iBufferSize += m_iAllocStep;
+    return m_BlockArray.back().get();
+  }
+  iIndexInBlock = iRealIndex % m_iAllocStep;
+  return m_BlockArray[iRealIndex / m_iAllocStep].get();
+}
+
+bool CFX_BlockBuffer::InitBuffer(int32_t iBufferSize) {
+  ClearBuffer();
+  int32_t iNumOfBlock = (iBufferSize - 1) / m_iAllocStep + 1;
+  for (int32_t i = 0; i < iNumOfBlock; i++)
+    m_BlockArray.emplace_back(FX_Alloc(wchar_t, m_iAllocStep));
+
+  m_iBufferSize = iNumOfBlock * m_iAllocStep;
+  return true;
+}
+
+void CFX_BlockBuffer::SetTextChar(int32_t iIndex, wchar_t ch) {
+  if (iIndex < 0) {
+    return;
+  }
+  int32_t iRealIndex = m_iStartPosition + iIndex;
+  int32_t iBlockIndex = iRealIndex / m_iAllocStep;
+  int32_t iInnerIndex = iRealIndex % m_iAllocStep;
+  int32_t iBlockSize = pdfium::CollectionSize<int32_t>(m_BlockArray);
+  if (iBlockIndex >= iBlockSize) {
+    int32_t iNewBlocks = iBlockIndex - iBlockSize + 1;
+    do {
+      m_BlockArray.emplace_back(FX_Alloc(wchar_t, m_iAllocStep));
+      m_iBufferSize += m_iAllocStep;
+    } while (--iNewBlocks);
+  }
+  wchar_t* pTextData = m_BlockArray[iBlockIndex].get();
+  pTextData[iInnerIndex] = ch;
+  m_iDataLength = std::max(m_iDataLength, iIndex + 1);
+}
+
+int32_t CFX_BlockBuffer::DeleteTextChars(int32_t iCount, bool bDirection) {
+  if (iCount <= 0)
+    return m_iDataLength;
+
+  if (iCount >= m_iDataLength) {
+    Reset(false);
+    return 0;
+  }
+  if (bDirection) {
+    m_iStartPosition += iCount;
+    m_iDataLength -= iCount;
+  } else {
+    m_iDataLength -= iCount;
+  }
+  return m_iDataLength;
+}
+
+void CFX_BlockBuffer::GetTextData(CFX_WideString& wsTextData,
+                                  int32_t iStart,
+                                  int32_t iLength) const {
+  wsTextData.clear();
+  int32_t iMaybeDataLength = m_iBufferSize - 1 - m_iStartPosition;
+  if (iStart < 0 || iStart > iMaybeDataLength) {
+    return;
+  }
+  if (iLength == -1 || iLength > iMaybeDataLength) {
+    iLength = iMaybeDataLength;
+  }
+  if (iLength <= 0) {
+    return;
+  }
+  wchar_t* pBuf = wsTextData.GetBuffer(iLength);
+  if (!pBuf) {
+    return;
+  }
+  int32_t iStartBlockIndex = 0;
+  int32_t iStartInnerIndex = 0;
+  TextDataIndex2BufIndex(iStart, iStartBlockIndex, iStartInnerIndex);
+  int32_t iEndBlockIndex = 0;
+  int32_t iEndInnerIndex = 0;
+  TextDataIndex2BufIndex(iStart + iLength, iEndBlockIndex, iEndInnerIndex);
+  int32_t iPointer = 0;
+  for (int32_t i = iStartBlockIndex; i <= iEndBlockIndex; i++) {
+    int32_t iBufferPointer = 0;
+    int32_t iCopyLength = m_iAllocStep;
+    if (i == iStartBlockIndex) {
+      iCopyLength -= iStartInnerIndex;
+      iBufferPointer = iStartInnerIndex;
+    }
+    if (i == iEndBlockIndex) {
+      iCopyLength -= ((m_iAllocStep - 1) - iEndInnerIndex);
+    }
+    wchar_t* pBlockBuf = m_BlockArray[i].get();
+    memcpy(pBuf + iPointer, pBlockBuf + iBufferPointer,
+           iCopyLength * sizeof(wchar_t));
+    iPointer += iCopyLength;
+  }
+  wsTextData.ReleaseBuffer(iLength);
+}
+
+void CFX_BlockBuffer::TextDataIndex2BufIndex(const int32_t iIndex,
+                                             int32_t& iBlockIndex,
+                                             int32_t& iInnerIndex) const {
+  ASSERT(iIndex >= 0);
+  int32_t iRealIndex = m_iStartPosition + iIndex;
+  iBlockIndex = iRealIndex / m_iAllocStep;
+  iInnerIndex = iRealIndex % m_iAllocStep;
+}
+
+void CFX_BlockBuffer::ClearBuffer() {
+  m_iBufferSize = 0;
+  m_BlockArray.clear();
+}
diff --git a/core/fxcrt/cfx_blockbuffer.h b/core/fxcrt/cfx_blockbuffer.h
new file mode 100644
index 0000000..dbf01a9
--- /dev/null
+++ b/core/fxcrt/cfx_blockbuffer.h
@@ -0,0 +1,54 @@
+// 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
+
+#ifndef CORE_FXCRT_CFX_BLOCKBUFFER_H_
+#define CORE_FXCRT_CFX_BLOCKBUFFER_H_
+
+#include <stdint.h>
+
+#include <memory>
+#include <vector>
+
+#include "core/fxcrt/fx_string.h"
+
+class CFX_BlockBuffer {
+ public:
+  explicit CFX_BlockBuffer(int32_t iAllocStep = 1024 * 1024);
+  ~CFX_BlockBuffer();
+
+  bool InitBuffer(int32_t iBufferSize = 1024 * 1024);
+  bool IsInitialized() { return m_iBufferSize / m_iAllocStep >= 1; }
+
+  wchar_t* GetAvailableBlock(int32_t& iIndexInBlock);
+  inline int32_t GetAllocStep() const { return m_iAllocStep; }
+  inline int32_t& GetDataLengthRef() { return m_iDataLength; }
+
+  inline void Reset(bool bReserveData = true) {
+    if (!bReserveData)
+      m_iStartPosition = 0;
+    m_iDataLength = 0;
+  }
+
+  void SetTextChar(int32_t iIndex, wchar_t ch);
+  int32_t DeleteTextChars(int32_t iCount, bool bDirection = true);
+  void GetTextData(CFX_WideString& wsTextData,
+                   int32_t iStart = 0,
+                   int32_t iLength = -1) const;
+
+ private:
+  inline void TextDataIndex2BufIndex(const int32_t iIndex,
+                                     int32_t& iBlockIndex,
+                                     int32_t& iInnerIndex) const;
+  void ClearBuffer();
+
+  std::vector<std::unique_ptr<wchar_t, FxFreeDeleter>> m_BlockArray;
+  int32_t m_iDataLength;
+  int32_t m_iBufferSize;
+  int32_t m_iAllocStep;
+  int32_t m_iStartPosition;
+};
+
+#endif  // CORE_FXCRT_CFX_BLOCKBUFFER_H_
diff --git a/testing/libfuzzer/pdf_xml_fuzzer.cc b/testing/libfuzzer/pdf_xml_fuzzer.cc
index e255f96..13eda60 100644
--- a/testing/libfuzzer/pdf_xml_fuzzer.cc
+++ b/testing/libfuzzer/pdf_xml_fuzzer.cc
@@ -10,8 +10,9 @@
 #include "core/fxcrt/fx_safe_types.h"
 #include "core/fxcrt/fx_system.h"
 #include "third_party/base/ptr_util.h"
-#include "xfa/fde/xml/cfde_xml_parser.h"
-#include "xfa/fde/xml/fde_xml_imp.h"
+#include "xfa/fde/xml/cfde_xmldoc.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
+#include "xfa/fde/xml/cfde_xmlparser.h"
 #include "xfa/fxfa/parser/cxfa_widetextread.h"
 
 namespace {
diff --git a/xfa/fde/xml/cfde_xmlchardata.cpp b/xfa/fde/xml/cfde_xmlchardata.cpp
new file mode 100644
index 0000000..40e4730
--- /dev/null
+++ b/xfa/fde/xml/cfde_xmlchardata.cpp
@@ -0,0 +1,21 @@
+// 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 "xfa/fde/xml/cfde_xmlchardata.h"
+
+CFDE_XMLCharData::CFDE_XMLCharData(const CFX_WideString& wsCData)
+    : CFDE_XMLDeclaration(), m_wsCharData(wsCData) {}
+
+CFDE_XMLCharData::~CFDE_XMLCharData() {}
+
+FDE_XMLNODETYPE CFDE_XMLCharData::GetType() const {
+  return FDE_XMLNODE_CharData;
+}
+
+CFDE_XMLNode* CFDE_XMLCharData::Clone(bool bRecursive) {
+  CFDE_XMLCharData* pClone = new CFDE_XMLCharData(m_wsCharData);
+  return pClone;
+}
diff --git a/xfa/fde/xml/cfde_xmlchardata.h b/xfa/fde/xml/cfde_xmlchardata.h
new file mode 100644
index 0000000..308ec17
--- /dev/null
+++ b/xfa/fde/xml/cfde_xmlchardata.h
@@ -0,0 +1,29 @@
+// 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
+
+#ifndef XFA_FDE_XML_CFDE_XMLCHARDATA_H_
+#define XFA_FDE_XML_CFDE_XMLCHARDATA_H_
+
+#include "core/fxcrt/fx_string.h"
+#include "xfa/fde/xml/cfde_xmldeclaration.h"
+
+class CFDE_XMLCharData : public CFDE_XMLDeclaration {
+ public:
+  explicit CFDE_XMLCharData(const CFX_WideString& wsCData);
+  ~CFDE_XMLCharData() override;
+
+  FDE_XMLNODETYPE GetType() const override;
+  CFDE_XMLNode* Clone(bool bRecursive) override;
+
+  void GetCharData(CFX_WideString& wsCharData) const {
+    wsCharData = m_wsCharData;
+  }
+  void SetCharData(const CFX_WideString& wsCData) { m_wsCharData = wsCData; }
+
+  CFX_WideString m_wsCharData;
+};
+
+#endif  // XFA_FDE_XML_CFDE_XMLCHARDATA_H_
diff --git a/xfa/fde/xml/cfde_xmldeclaration.h b/xfa/fde/xml/cfde_xmldeclaration.h
new file mode 100644
index 0000000..ade66c4
--- /dev/null
+++ b/xfa/fde/xml/cfde_xmldeclaration.h
@@ -0,0 +1,18 @@
+// 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
+
+#ifndef XFA_FDE_XML_CFDE_XMLDECLARATION_H_
+#define XFA_FDE_XML_CFDE_XMLDECLARATION_H_
+
+#include "xfa/fde/xml/cfde_xmlnode.h"
+
+class CFDE_XMLDeclaration : public CFDE_XMLNode {
+ public:
+  CFDE_XMLDeclaration() {}
+  ~CFDE_XMLDeclaration() override {}
+};
+
+#endif  // XFA_FDE_XML_CFDE_XMLDECLARATION_H_
diff --git a/xfa/fde/xml/cfde_xmldoc.cpp b/xfa/fde/xml/cfde_xmldoc.cpp
new file mode 100644
index 0000000..bc526ae
--- /dev/null
+++ b/xfa/fde/xml/cfde_xmldoc.cpp
@@ -0,0 +1,161 @@
+// 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 "xfa/fde/xml/cfde_xmldoc.h"
+
+#include <utility>
+#include <vector>
+
+#include "third_party/base/ptr_util.h"
+#include "third_party/base/stl_util.h"
+#include "xfa/fde/xml/cfde_xmlchardata.h"
+#include "xfa/fde/xml/cfde_xmlelement.h"
+#include "xfa/fde/xml/cfde_xmlinstruction.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
+#include "xfa/fde/xml/cfde_xmltext.h"
+#include "xfa/fgas/crt/fgas_codepage.h"
+
+CFDE_XMLDoc::CFDE_XMLDoc()
+    : m_iStatus(0), m_pRoot(pdfium::MakeUnique<CFDE_XMLNode>()) {
+  m_pRoot->InsertChildNode(new CFDE_XMLInstruction(L"xml"));
+}
+
+CFDE_XMLDoc::~CFDE_XMLDoc() {}
+
+bool CFDE_XMLDoc::LoadXML(std::unique_ptr<CFDE_XMLParser> pXMLParser) {
+  if (!pXMLParser)
+    return false;
+
+  m_iStatus = 0;
+  m_pStream.Reset();
+  m_pRoot->DeleteChildren();
+  m_pXMLParser = std::move(pXMLParser);
+  return true;
+}
+
+int32_t CFDE_XMLDoc::DoLoad(IFX_Pause* pPause) {
+  if (m_iStatus < 100)
+    m_iStatus = m_pXMLParser->DoParser(pPause);
+
+  return m_iStatus;
+}
+
+void CFDE_XMLDoc::CloseXML() {
+  m_pXMLParser.reset();
+}
+
+void CFDE_XMLDoc::SaveXMLNode(const CFX_RetainPtr<IFGAS_Stream>& pXMLStream,
+                              CFDE_XMLNode* pINode) {
+  CFDE_XMLNode* pNode = (CFDE_XMLNode*)pINode;
+  switch (pNode->GetType()) {
+    case FDE_XMLNODE_Instruction: {
+      CFX_WideString ws;
+      CFDE_XMLInstruction* pInstruction = (CFDE_XMLInstruction*)pNode;
+      if (pInstruction->m_wsTarget.CompareNoCase(L"xml") == 0) {
+        ws = L"<?xml version=\"1.0\" encoding=\"";
+        uint16_t wCodePage = pXMLStream->GetCodePage();
+        if (wCodePage == FX_CODEPAGE_UTF16LE) {
+          ws += L"UTF-16";
+        } else if (wCodePage == FX_CODEPAGE_UTF16BE) {
+          ws += L"UTF-16be";
+        } else {
+          ws += L"UTF-8";
+        }
+        ws += L"\"?>";
+        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+      } else {
+        ws.Format(L"<?%s", pInstruction->m_wsTarget.c_str());
+        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+        std::vector<CFX_WideString>& attributes = pInstruction->m_Attributes;
+        int32_t i;
+        int32_t iCount = pdfium::CollectionSize<int32_t>(attributes);
+        CFX_WideString wsValue;
+        for (i = 0; i < iCount; i += 2) {
+          ws = L" ";
+          ws += attributes[i];
+          ws += L"=\"";
+          wsValue = attributes[i + 1];
+          wsValue.Replace(L"&", L"&amp;");
+          wsValue.Replace(L"<", L"&lt;");
+          wsValue.Replace(L">", L"&gt;");
+          wsValue.Replace(L"\'", L"&apos;");
+          wsValue.Replace(L"\"", L"&quot;");
+          ws += wsValue;
+          ws += L"\"";
+          pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+        }
+        std::vector<CFX_WideString>& targetdata = pInstruction->m_TargetData;
+        iCount = pdfium::CollectionSize<int32_t>(targetdata);
+        for (i = 0; i < iCount; i++) {
+          ws = L" \"";
+          ws += targetdata[i];
+          ws += L"\"";
+          pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+        }
+        ws = L"?>";
+        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+      }
+    } break;
+    case FDE_XMLNODE_Element: {
+      CFX_WideString ws;
+      ws = L"<";
+      ws += ((CFDE_XMLElement*)pNode)->m_wsTag;
+      pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+      std::vector<CFX_WideString>& attributes =
+          static_cast<CFDE_XMLElement*>(pNode)->m_Attributes;
+      int32_t iCount = pdfium::CollectionSize<int32_t>(attributes);
+      CFX_WideString wsValue;
+      for (int32_t i = 0; i < iCount; i += 2) {
+        ws = L" ";
+        ws += attributes[i];
+        ws += L"=\"";
+        wsValue = attributes[i + 1];
+        wsValue.Replace(L"&", L"&amp;");
+        wsValue.Replace(L"<", L"&lt;");
+        wsValue.Replace(L">", L"&gt;");
+        wsValue.Replace(L"\'", L"&apos;");
+        wsValue.Replace(L"\"", L"&quot;");
+        ws += wsValue;
+        ws += L"\"";
+        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+      }
+      if (pNode->m_pChild) {
+        ws = L"\n>";
+        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+        CFDE_XMLNode* pChild = pNode->m_pChild;
+        while (pChild) {
+          SaveXMLNode(pXMLStream, static_cast<CFDE_XMLNode*>(pChild));
+          pChild = pChild->m_pNext;
+        }
+        ws = L"</";
+        ws += ((CFDE_XMLElement*)pNode)->m_wsTag;
+        ws += L"\n>";
+      } else {
+        ws = L"\n/>";
+      }
+      pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+    } break;
+    case FDE_XMLNODE_Text: {
+      CFX_WideString ws = ((CFDE_XMLText*)pNode)->m_wsText;
+      ws.Replace(L"&", L"&amp;");
+      ws.Replace(L"<", L"&lt;");
+      ws.Replace(L">", L"&gt;");
+      ws.Replace(L"\'", L"&apos;");
+      ws.Replace(L"\"", L"&quot;");
+      pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+    } break;
+    case FDE_XMLNODE_CharData: {
+      CFX_WideString ws = L"<![CDATA[";
+      ws += ((CFDE_XMLCharData*)pNode)->m_wsCharData;
+      ws += L"]]>";
+      pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+    } break;
+    case FDE_XMLNODE_Unknown:
+      break;
+    default:
+      break;
+  }
+}
diff --git a/xfa/fde/xml/cfde_xmldoc.h b/xfa/fde/xml/cfde_xmldoc.h
new file mode 100644
index 0000000..3eb07a8
--- /dev/null
+++ b/xfa/fde/xml/cfde_xmldoc.h
@@ -0,0 +1,36 @@
+// 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
+
+#ifndef XFA_FDE_XML_CFDE_XMLDOC_H_
+#define XFA_FDE_XML_CFDE_XMLDOC_H_
+
+#include <memory>
+
+#include "core/fxcrt/cfx_retain_ptr.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
+#include "xfa/fde/xml/cfde_xmlparser.h"
+#include "xfa/fgas/crt/ifgas_stream.h"
+
+class CFDE_XMLDoc {
+ public:
+  CFDE_XMLDoc();
+  ~CFDE_XMLDoc();
+
+  bool LoadXML(std::unique_ptr<CFDE_XMLParser> pXMLParser);
+  int32_t DoLoad(IFX_Pause* pPause = nullptr);
+  void CloseXML();
+  CFDE_XMLNode* GetRoot() const { return m_pRoot.get(); }
+  void SaveXMLNode(const CFX_RetainPtr<IFGAS_Stream>& pXMLStream,
+                   CFDE_XMLNode* pNode);
+
+ private:
+  int32_t m_iStatus;
+  std::unique_ptr<CFDE_XMLNode> m_pRoot;
+  std::unique_ptr<CFDE_XMLParser> m_pXMLParser;
+  CFX_RetainPtr<IFGAS_Stream> m_pStream;
+};
+
+#endif  // XFA_FDE_XML_CFDE_XMLDOC_H_
diff --git a/xfa/fde/xml/cfde_xmlelement.cpp b/xfa/fde/xml/cfde_xmlelement.cpp
new file mode 100644
index 0000000..aca27c5
--- /dev/null
+++ b/xfa/fde/xml/cfde_xmlelement.cpp
@@ -0,0 +1,223 @@
+// 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 "xfa/fde/xml/cfde_xmlelement.h"
+
+#include "core/fxcrt/fx_ext.h"
+#include "third_party/base/stl_util.h"
+#include "xfa/fde/xml/cfde_xmlchardata.h"
+#include "xfa/fde/xml/cfde_xmltext.h"
+
+CFDE_XMLElement::CFDE_XMLElement(const CFX_WideString& wsTag)
+    : CFDE_XMLNode(), m_wsTag(wsTag), m_Attributes() {
+  ASSERT(m_wsTag.GetLength() > 0);
+}
+
+CFDE_XMLElement::~CFDE_XMLElement() {}
+
+FDE_XMLNODETYPE CFDE_XMLElement::GetType() const {
+  return FDE_XMLNODE_Element;
+}
+
+CFDE_XMLNode* CFDE_XMLElement::Clone(bool bRecursive) {
+  CFDE_XMLElement* pClone = new CFDE_XMLElement(m_wsTag);
+  if (!pClone)
+    return nullptr;
+
+  pClone->m_Attributes = m_Attributes;
+  if (bRecursive) {
+    CloneChildren(pClone);
+  } else {
+    CFX_WideString wsText;
+    CFDE_XMLNode* pChild = m_pChild;
+    while (pChild) {
+      switch (pChild->GetType()) {
+        case FDE_XMLNODE_Text:
+          wsText += ((CFDE_XMLText*)pChild)->m_wsText;
+          break;
+        default:
+          break;
+      }
+      pChild = pChild->m_pNext;
+    }
+    pClone->SetTextData(wsText);
+  }
+  return pClone;
+}
+
+void CFDE_XMLElement::GetTagName(CFX_WideString& wsTag) const {
+  wsTag = m_wsTag;
+}
+
+void CFDE_XMLElement::GetLocalTagName(CFX_WideString& wsTag) const {
+  FX_STRSIZE iFind = m_wsTag.Find(L':', 0);
+  if (iFind < 0) {
+    wsTag = m_wsTag;
+  } else {
+    wsTag = m_wsTag.Right(m_wsTag.GetLength() - iFind - 1);
+  }
+}
+
+void CFDE_XMLElement::GetNamespacePrefix(CFX_WideString& wsPrefix) const {
+  FX_STRSIZE iFind = m_wsTag.Find(L':', 0);
+  if (iFind < 0) {
+    wsPrefix.clear();
+  } else {
+    wsPrefix = m_wsTag.Left(iFind);
+  }
+}
+
+void CFDE_XMLElement::GetNamespaceURI(CFX_WideString& wsNamespace) const {
+  CFX_WideString wsAttri(L"xmlns"), wsPrefix;
+  GetNamespacePrefix(wsPrefix);
+  if (wsPrefix.GetLength() > 0) {
+    wsAttri += L":";
+    wsAttri += wsPrefix;
+  }
+  wsNamespace.clear();
+  CFDE_XMLNode* pNode = (CFDE_XMLNode*)this;
+  while (pNode) {
+    if (pNode->GetType() != FDE_XMLNODE_Element) {
+      break;
+    }
+    CFDE_XMLElement* pElement = (CFDE_XMLElement*)pNode;
+    if (!pElement->HasAttribute(wsAttri.c_str())) {
+      pNode = pNode->GetNodeItem(CFDE_XMLNode::Parent);
+      continue;
+    }
+    pElement->GetString(wsAttri.c_str(), wsNamespace);
+    break;
+  }
+}
+
+int32_t CFDE_XMLElement::CountAttributes() const {
+  return pdfium::CollectionSize<int32_t>(m_Attributes) / 2;
+}
+
+bool CFDE_XMLElement::GetAttribute(int32_t index,
+                                   CFX_WideString& wsAttriName,
+                                   CFX_WideString& wsAttriValue) const {
+  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
+  ASSERT(index > -1 && index < iCount / 2);
+  for (int32_t i = 0; i < iCount; i += 2) {
+    if (index == 0) {
+      wsAttriName = m_Attributes[i];
+      wsAttriValue = m_Attributes[i + 1];
+      return true;
+    }
+    index--;
+  }
+  return false;
+}
+
+bool CFDE_XMLElement::HasAttribute(const wchar_t* pwsAttriName) const {
+  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
+  for (int32_t i = 0; i < iCount; i += 2) {
+    if (m_Attributes[i].Compare(pwsAttriName) == 0)
+      return true;
+  }
+  return false;
+}
+
+void CFDE_XMLElement::GetString(const wchar_t* pwsAttriName,
+                                CFX_WideString& wsAttriValue,
+                                const wchar_t* pwsDefValue) const {
+  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
+  for (int32_t i = 0; i < iCount; i += 2) {
+    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
+      wsAttriValue = m_Attributes[i + 1];
+      return;
+    }
+  }
+  wsAttriValue = pwsDefValue;
+}
+
+void CFDE_XMLElement::SetString(const CFX_WideString& wsAttriName,
+                                const CFX_WideString& wsAttriValue) {
+  ASSERT(wsAttriName.GetLength() > 0);
+  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
+  for (int32_t i = 0; i < iCount; i += 2) {
+    if (m_Attributes[i].Compare(wsAttriName) == 0) {
+      m_Attributes[i] = wsAttriName;
+      m_Attributes[i + 1] = wsAttriValue;
+      return;
+    }
+  }
+  m_Attributes.push_back(wsAttriName);
+  m_Attributes.push_back(wsAttriValue);
+}
+
+int32_t CFDE_XMLElement::GetInteger(const wchar_t* pwsAttriName,
+                                    int32_t iDefValue) const {
+  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
+  for (int32_t i = 0; i < iCount; i += 2) {
+    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
+      return FXSYS_wtoi(m_Attributes[i + 1].c_str());
+    }
+  }
+  return iDefValue;
+}
+
+void CFDE_XMLElement::SetInteger(const wchar_t* pwsAttriName,
+                                 int32_t iAttriValue) {
+  CFX_WideString wsValue;
+  wsValue.Format(L"%d", iAttriValue);
+  SetString(pwsAttriName, wsValue);
+}
+
+float CFDE_XMLElement::GetFloat(const wchar_t* pwsAttriName,
+                                float fDefValue) const {
+  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
+  for (int32_t i = 0; i < iCount; i += 2) {
+    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
+      return FXSYS_wcstof(m_Attributes[i + 1].c_str(), -1, nullptr);
+    }
+  }
+  return fDefValue;
+}
+
+void CFDE_XMLElement::SetFloat(const wchar_t* pwsAttriName, float fAttriValue) {
+  CFX_WideString wsValue;
+  wsValue.Format(L"%f", fAttriValue);
+  SetString(pwsAttriName, wsValue);
+}
+
+void CFDE_XMLElement::RemoveAttribute(const wchar_t* pwsAttriName) {
+  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
+  for (int32_t i = 0; i < iCount; i += 2) {
+    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
+      m_Attributes.erase(m_Attributes.begin() + i,
+                         m_Attributes.begin() + i + 2);
+      return;
+    }
+  }
+}
+
+void CFDE_XMLElement::GetTextData(CFX_WideString& wsText) const {
+  CFX_WideTextBuf buffer;
+  CFDE_XMLNode* pChild = m_pChild;
+  while (pChild) {
+    switch (pChild->GetType()) {
+      case FDE_XMLNODE_Text:
+        buffer << ((CFDE_XMLText*)pChild)->m_wsText;
+        break;
+      case FDE_XMLNODE_CharData:
+        buffer << ((CFDE_XMLCharData*)pChild)->m_wsCharData;
+        break;
+      default:
+        break;
+    }
+    pChild = pChild->m_pNext;
+  }
+  wsText = buffer.AsStringC();
+}
+
+void CFDE_XMLElement::SetTextData(const CFX_WideString& wsText) {
+  if (wsText.GetLength() < 1) {
+    return;
+  }
+  InsertChildNode(new CFDE_XMLText(wsText));
+}
diff --git a/xfa/fde/xml/cfde_xmlelement.h b/xfa/fde/xml/cfde_xmlelement.h
new file mode 100644
index 0000000..8f61035
--- /dev/null
+++ b/xfa/fde/xml/cfde_xmlelement.h
@@ -0,0 +1,56 @@
+// 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
+
+#ifndef XFA_FDE_XML_CFDE_XMLELEMENT_H_
+#define XFA_FDE_XML_CFDE_XMLELEMENT_H_
+
+#include <vector>
+
+#include "core/fxcrt/fx_string.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
+
+class CFDE_XMLElement : public CFDE_XMLNode {
+ public:
+  explicit CFDE_XMLElement(const CFX_WideString& wsTag);
+  ~CFDE_XMLElement() override;
+
+  // CFDE_XMLNode
+  FDE_XMLNODETYPE GetType() const override;
+  CFDE_XMLNode* Clone(bool bRecursive) override;
+
+  void GetTagName(CFX_WideString& wsTag) const;
+  void GetLocalTagName(CFX_WideString& wsTag) const;
+
+  void GetNamespacePrefix(CFX_WideString& wsPrefix) const;
+  void GetNamespaceURI(CFX_WideString& wsNamespace) const;
+
+  int32_t CountAttributes() const;
+  bool GetAttribute(int32_t index,
+                    CFX_WideString& wsAttriName,
+                    CFX_WideString& wsAttriValue) const;
+  bool HasAttribute(const wchar_t* pwsAttriName) const;
+  void RemoveAttribute(const wchar_t* pwsAttriName);
+
+  void GetString(const wchar_t* pwsAttriName,
+                 CFX_WideString& wsAttriValue,
+                 const wchar_t* pwsDefValue = nullptr) const;
+  void SetString(const CFX_WideString& wsAttriName,
+                 const CFX_WideString& wsAttriValue);
+
+  int32_t GetInteger(const wchar_t* pwsAttriName, int32_t iDefValue = 0) const;
+  void SetInteger(const wchar_t* pwsAttriName, int32_t iAttriValue);
+
+  float GetFloat(const wchar_t* pwsAttriName, float fDefValue = 0) const;
+  void SetFloat(const wchar_t* pwsAttriName, float fAttriValue);
+
+  void GetTextData(CFX_WideString& wsText) const;
+  void SetTextData(const CFX_WideString& wsText);
+
+  CFX_WideString m_wsTag;
+  std::vector<CFX_WideString> m_Attributes;
+};
+
+#endif  // XFA_FDE_XML_CFDE_XMLELEMENT_H_
diff --git a/xfa/fde/xml/cfde_xmlinstruction.cpp b/xfa/fde/xml/cfde_xmlinstruction.cpp
new file mode 100644
index 0000000..64c980b
--- /dev/null
+++ b/xfa/fde/xml/cfde_xmlinstruction.cpp
@@ -0,0 +1,160 @@
+// 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 "xfa/fde/xml/cfde_xmlinstruction.h"
+
+#include "core/fxcrt/fx_ext.h"
+#include "third_party/base/stl_util.h"
+
+CFDE_XMLInstruction::CFDE_XMLInstruction(const CFX_WideString& wsTarget)
+    : m_wsTarget(wsTarget) {
+  ASSERT(m_wsTarget.GetLength() > 0);
+}
+
+CFDE_XMLInstruction::~CFDE_XMLInstruction() {}
+
+FDE_XMLNODETYPE CFDE_XMLInstruction::GetType() const {
+  return FDE_XMLNODE_Instruction;
+}
+
+CFDE_XMLNode* CFDE_XMLInstruction::Clone(bool bRecursive) {
+  CFDE_XMLInstruction* pClone = new CFDE_XMLInstruction(m_wsTarget);
+  if (!pClone)
+    return nullptr;
+
+  pClone->m_Attributes = m_Attributes;
+  pClone->m_TargetData = m_TargetData;
+  if (bRecursive)
+    CloneChildren(pClone);
+
+  return pClone;
+}
+
+int32_t CFDE_XMLInstruction::CountAttributes() const {
+  return pdfium::CollectionSize<int32_t>(m_Attributes) / 2;
+}
+
+bool CFDE_XMLInstruction::GetAttribute(int32_t index,
+                                       CFX_WideString& wsAttriName,
+                                       CFX_WideString& wsAttriValue) const {
+  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
+  ASSERT(index > -1 && index < iCount / 2);
+  for (int32_t i = 0; i < iCount; i += 2) {
+    if (index == 0) {
+      wsAttriName = m_Attributes[i];
+      wsAttriValue = m_Attributes[i + 1];
+      return true;
+    }
+    index--;
+  }
+  return false;
+}
+
+bool CFDE_XMLInstruction::HasAttribute(const wchar_t* pwsAttriName) const {
+  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
+  for (int32_t i = 0; i < iCount; i += 2) {
+    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
+      return true;
+    }
+  }
+  return false;
+}
+
+void CFDE_XMLInstruction::GetString(const wchar_t* pwsAttriName,
+                                    CFX_WideString& wsAttriValue,
+                                    const wchar_t* pwsDefValue) const {
+  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
+  for (int32_t i = 0; i < iCount; i += 2) {
+    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
+      wsAttriValue = m_Attributes[i + 1];
+      return;
+    }
+  }
+  wsAttriValue = pwsDefValue;
+}
+
+void CFDE_XMLInstruction::SetString(const CFX_WideString& wsAttriName,
+                                    const CFX_WideString& wsAttriValue) {
+  ASSERT(wsAttriName.GetLength() > 0);
+  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
+  for (int32_t i = 0; i < iCount; i += 2) {
+    if (m_Attributes[i].Compare(wsAttriName) == 0) {
+      m_Attributes[i] = wsAttriName;
+      m_Attributes[i + 1] = wsAttriValue;
+      return;
+    }
+  }
+  m_Attributes.push_back(wsAttriName);
+  m_Attributes.push_back(wsAttriValue);
+}
+
+int32_t CFDE_XMLInstruction::GetInteger(const wchar_t* pwsAttriName,
+                                        int32_t iDefValue) const {
+  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
+  for (int32_t i = 0; i < iCount; i += 2) {
+    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
+      return FXSYS_wtoi(m_Attributes[i + 1].c_str());
+    }
+  }
+  return iDefValue;
+}
+
+void CFDE_XMLInstruction::SetInteger(const wchar_t* pwsAttriName,
+                                     int32_t iAttriValue) {
+  CFX_WideString wsValue;
+  wsValue.Format(L"%d", iAttriValue);
+  SetString(pwsAttriName, wsValue);
+}
+
+float CFDE_XMLInstruction::GetFloat(const wchar_t* pwsAttriName,
+                                    float fDefValue) const {
+  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
+  for (int32_t i = 0; i < iCount; i += 2) {
+    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
+      return FXSYS_wcstof(m_Attributes[i + 1].c_str(), -1, nullptr);
+    }
+  }
+  return fDefValue;
+}
+
+void CFDE_XMLInstruction::SetFloat(const wchar_t* pwsAttriName,
+                                   float fAttriValue) {
+  CFX_WideString wsValue;
+  wsValue.Format(L"%f", fAttriValue);
+  SetString(pwsAttriName, wsValue);
+}
+
+void CFDE_XMLInstruction::RemoveAttribute(const wchar_t* pwsAttriName) {
+  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
+  for (int32_t i = 0; i < iCount; i += 2) {
+    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
+      m_Attributes.erase(m_Attributes.begin() + i,
+                         m_Attributes.begin() + i + 2);
+      return;
+    }
+  }
+}
+
+int32_t CFDE_XMLInstruction::CountData() const {
+  return pdfium::CollectionSize<int32_t>(m_TargetData);
+}
+
+bool CFDE_XMLInstruction::GetData(int32_t index, CFX_WideString& wsData) const {
+  if (!pdfium::IndexInBounds(m_TargetData, index))
+    return false;
+
+  wsData = m_TargetData[index];
+  return true;
+}
+
+void CFDE_XMLInstruction::AppendData(const CFX_WideString& wsData) {
+  m_TargetData.push_back(wsData);
+}
+
+void CFDE_XMLInstruction::RemoveData(int32_t index) {
+  if (pdfium::IndexInBounds(m_TargetData, index))
+    m_TargetData.erase(m_TargetData.begin() + index);
+}
diff --git a/xfa/fde/xml/cfde_xmlinstruction.h b/xfa/fde/xml/cfde_xmlinstruction.h
new file mode 100644
index 0000000..58dc5f1
--- /dev/null
+++ b/xfa/fde/xml/cfde_xmlinstruction.h
@@ -0,0 +1,50 @@
+// 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
+
+#ifndef XFA_FDE_XML_CFDE_XMLINSTRUCTION_H_
+#define XFA_FDE_XML_CFDE_XMLINSTRUCTION_H_
+
+#include <vector>
+
+#include "core/fxcrt/fx_string.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
+
+class CFDE_XMLInstruction : public CFDE_XMLNode {
+ public:
+  explicit CFDE_XMLInstruction(const CFX_WideString& wsTarget);
+  ~CFDE_XMLInstruction() override;
+
+  // CFDE_XMLNode
+  FDE_XMLNODETYPE GetType() const override;
+  CFDE_XMLNode* Clone(bool bRecursive) override;
+
+  void GetTargetName(CFX_WideString& wsTarget) const { wsTarget = m_wsTarget; }
+  int32_t CountAttributes() const;
+  bool GetAttribute(int32_t index,
+                    CFX_WideString& wsAttriName,
+                    CFX_WideString& wsAttriValue) const;
+  bool HasAttribute(const wchar_t* pwsAttriName) const;
+  void GetString(const wchar_t* pwsAttriName,
+                 CFX_WideString& wsAttriValue,
+                 const wchar_t* pwsDefValue = nullptr) const;
+  void SetString(const CFX_WideString& wsAttriName,
+                 const CFX_WideString& wsAttriValue);
+  int32_t GetInteger(const wchar_t* pwsAttriName, int32_t iDefValue = 0) const;
+  void SetInteger(const wchar_t* pwsAttriName, int32_t iAttriValue);
+  float GetFloat(const wchar_t* pwsAttriName, float fDefValue = 0) const;
+  void SetFloat(const wchar_t* pwsAttriName, float fAttriValue);
+  void RemoveAttribute(const wchar_t* pwsAttriName);
+  int32_t CountData() const;
+  bool GetData(int32_t index, CFX_WideString& wsData) const;
+  void AppendData(const CFX_WideString& wsData);
+  void RemoveData(int32_t index);
+
+  CFX_WideString m_wsTarget;
+  std::vector<CFX_WideString> m_Attributes;
+  std::vector<CFX_WideString> m_TargetData;
+};
+
+#endif  // XFA_FDE_XML_CFDE_XMLINSTRUCTION_H_
diff --git a/xfa/fde/xml/cfde_xmlnode.cpp b/xfa/fde/xml/cfde_xmlnode.cpp
new file mode 100644
index 0000000..bd86c0b
--- /dev/null
+++ b/xfa/fde/xml/cfde_xmlnode.cpp
@@ -0,0 +1,458 @@
+// 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 "xfa/fde/xml/cfde_xmlnode.h"
+
+#include <vector>
+
+#include "third_party/base/stl_util.h"
+#include "xfa/fde/xml/cfde_xmlchardata.h"
+#include "xfa/fde/xml/cfde_xmlelement.h"
+#include "xfa/fde/xml/cfde_xmlinstruction.h"
+#include "xfa/fde/xml/cfde_xmltext.h"
+#include "xfa/fgas/crt/fgas_codepage.h"
+
+CFDE_XMLNode::CFDE_XMLNode()
+    : m_pParent(nullptr),
+      m_pChild(nullptr),
+      m_pPrior(nullptr),
+      m_pNext(nullptr) {}
+
+FDE_XMLNODETYPE CFDE_XMLNode::GetType() const {
+  return FDE_XMLNODE_Unknown;
+}
+
+CFDE_XMLNode::~CFDE_XMLNode() {
+  DeleteChildren();
+}
+
+void CFDE_XMLNode::DeleteChildren() {
+  CFDE_XMLNode* pChild = m_pChild;
+  while (pChild) {
+    CFDE_XMLNode* pNext = pChild->m_pNext;
+    delete pChild;
+    pChild = pNext;
+  }
+  m_pChild = nullptr;
+}
+
+int32_t CFDE_XMLNode::CountChildNodes() const {
+  int32_t iCount = 0;
+  CFDE_XMLNode* pChild = m_pChild;
+  while (pChild) {
+    iCount++;
+    pChild = pChild->m_pNext;
+  }
+  return iCount;
+}
+
+CFDE_XMLNode* CFDE_XMLNode::GetChildNode(int32_t index) const {
+  CFDE_XMLNode* pChild = m_pChild;
+  while (pChild) {
+    if (index == 0) {
+      return pChild;
+    }
+    index--;
+    pChild = pChild->m_pNext;
+  }
+  return nullptr;
+}
+
+int32_t CFDE_XMLNode::GetChildNodeIndex(CFDE_XMLNode* pNode) const {
+  int32_t index = 0;
+  CFDE_XMLNode* pChild = m_pChild;
+  while (pChild) {
+    if (pChild == pNode) {
+      return index;
+    }
+    index++;
+    pChild = pChild->m_pNext;
+  }
+  return -1;
+}
+
+CFDE_XMLNode* CFDE_XMLNode::GetPath(const wchar_t* pPath,
+                                    int32_t iLength,
+                                    bool bQualifiedName) const {
+  ASSERT(pPath);
+  if (iLength < 0) {
+    iLength = FXSYS_wcslen(pPath);
+  }
+  if (iLength == 0) {
+    return nullptr;
+  }
+  CFX_WideString csPath;
+  const wchar_t* pStart = pPath;
+  const wchar_t* pEnd = pPath + iLength;
+  wchar_t ch;
+  while (pStart < pEnd) {
+    ch = *pStart++;
+    if (ch == L'/') {
+      break;
+    } else {
+      csPath += ch;
+    }
+  }
+  iLength -= pStart - pPath;
+  CFDE_XMLNode* pFind = nullptr;
+  if (csPath.GetLength() < 1) {
+    pFind = GetNodeItem(CFDE_XMLNode::Root);
+  } else if (csPath.Compare(L"..") == 0) {
+    pFind = m_pParent;
+  } else if (csPath.Compare(L".") == 0) {
+    pFind = (CFDE_XMLNode*)this;
+  } else {
+    CFX_WideString wsTag;
+    CFDE_XMLNode* pNode = m_pChild;
+    while (pNode) {
+      if (pNode->GetType() == FDE_XMLNODE_Element) {
+        if (bQualifiedName) {
+          ((CFDE_XMLElement*)pNode)->GetTagName(wsTag);
+        } else {
+          ((CFDE_XMLElement*)pNode)->GetLocalTagName(wsTag);
+        }
+        if (wsTag.Compare(csPath) == 0) {
+          if (iLength < 1) {
+            pFind = pNode;
+          } else {
+            pFind = pNode->GetPath(pStart, iLength, bQualifiedName);
+          }
+          if (pFind)
+            return pFind;
+        }
+      }
+      pNode = pNode->m_pNext;
+    }
+  }
+  if (!pFind || iLength < 1)
+    return pFind;
+  return pFind->GetPath(pStart, iLength, bQualifiedName);
+}
+
+int32_t CFDE_XMLNode::InsertChildNode(CFDE_XMLNode* pNode, int32_t index) {
+  pNode->m_pParent = this;
+  if (!m_pChild) {
+    m_pChild = pNode;
+    pNode->m_pPrior = nullptr;
+    pNode->m_pNext = nullptr;
+    return 0;
+  }
+  if (index == 0) {
+    pNode->m_pNext = m_pChild;
+    pNode->m_pPrior = nullptr;
+    m_pChild->m_pPrior = pNode;
+    m_pChild = pNode;
+    return 0;
+  }
+  int32_t iCount = 0;
+  CFDE_XMLNode* pFind = m_pChild;
+  while (++iCount != index && pFind->m_pNext) {
+    pFind = pFind->m_pNext;
+  }
+  pNode->m_pPrior = pFind;
+  pNode->m_pNext = pFind->m_pNext;
+  if (pFind->m_pNext)
+    pFind->m_pNext->m_pPrior = pNode;
+  pFind->m_pNext = pNode;
+  return iCount;
+}
+
+void CFDE_XMLNode::RemoveChildNode(CFDE_XMLNode* pNode) {
+  ASSERT(m_pChild && pNode);
+  if (m_pChild == pNode) {
+    m_pChild = pNode->m_pNext;
+  } else {
+    pNode->m_pPrior->m_pNext = pNode->m_pNext;
+  }
+  if (pNode->m_pNext)
+    pNode->m_pNext->m_pPrior = pNode->m_pPrior;
+  pNode->m_pParent = nullptr;
+  pNode->m_pNext = nullptr;
+  pNode->m_pPrior = nullptr;
+}
+
+CFDE_XMLNode* CFDE_XMLNode::GetNodeItem(CFDE_XMLNode::NodeItem eItem) const {
+  switch (eItem) {
+    case CFDE_XMLNode::Root: {
+      CFDE_XMLNode* pParent = (CFDE_XMLNode*)this;
+      while (pParent->m_pParent) {
+        pParent = pParent->m_pParent;
+      }
+      return pParent;
+    }
+    case CFDE_XMLNode::Parent:
+      return m_pParent;
+    case CFDE_XMLNode::FirstSibling: {
+      CFDE_XMLNode* pItem = (CFDE_XMLNode*)this;
+      while (pItem->m_pPrior) {
+        pItem = pItem->m_pPrior;
+      }
+      return pItem == (CFDE_XMLNode*)this ? nullptr : pItem;
+    }
+    case CFDE_XMLNode::PriorSibling:
+      return m_pPrior;
+    case CFDE_XMLNode::NextSibling:
+      return m_pNext;
+    case CFDE_XMLNode::LastSibling: {
+      CFDE_XMLNode* pItem = (CFDE_XMLNode*)this;
+      while (pItem->m_pNext)
+        pItem = pItem->m_pNext;
+      return pItem == (CFDE_XMLNode*)this ? nullptr : pItem;
+    }
+    case CFDE_XMLNode::FirstNeighbor: {
+      CFDE_XMLNode* pParent = (CFDE_XMLNode*)this;
+      while (pParent->m_pParent)
+        pParent = pParent->m_pParent;
+      return pParent == (CFDE_XMLNode*)this ? nullptr : pParent;
+    }
+    case CFDE_XMLNode::PriorNeighbor: {
+      if (!m_pPrior)
+        return m_pParent;
+
+      CFDE_XMLNode* pItem = m_pPrior;
+      while (pItem->m_pChild) {
+        pItem = pItem->m_pChild;
+        while (pItem->m_pNext)
+          pItem = pItem->m_pNext;
+      }
+      return pItem;
+    }
+    case CFDE_XMLNode::NextNeighbor: {
+      if (m_pChild)
+        return m_pChild;
+      if (m_pNext)
+        return m_pNext;
+      CFDE_XMLNode* pItem = m_pParent;
+      while (pItem) {
+        if (pItem->m_pNext)
+          return pItem->m_pNext;
+        pItem = pItem->m_pParent;
+      }
+      return nullptr;
+    }
+    case CFDE_XMLNode::LastNeighbor: {
+      CFDE_XMLNode* pItem = (CFDE_XMLNode*)this;
+      while (pItem->m_pParent) {
+        pItem = pItem->m_pParent;
+      }
+      while (true) {
+        while (pItem->m_pNext)
+          pItem = pItem->m_pNext;
+        if (!pItem->m_pChild)
+          break;
+        pItem = pItem->m_pChild;
+      }
+      return pItem == (CFDE_XMLNode*)this ? nullptr : pItem;
+    }
+    case CFDE_XMLNode::FirstChild:
+      return m_pChild;
+    case CFDE_XMLNode::LastChild: {
+      if (!m_pChild)
+        return nullptr;
+
+      CFDE_XMLNode* pChild = m_pChild;
+      while (pChild->m_pNext)
+        pChild = pChild->m_pNext;
+      return pChild;
+    }
+    default:
+      break;
+  }
+  return nullptr;
+}
+
+int32_t CFDE_XMLNode::GetNodeLevel() const {
+  int32_t iLevel = 0;
+  const CFDE_XMLNode* pItem = m_pParent;
+  while (pItem) {
+    iLevel++;
+    pItem = pItem->m_pParent;
+  }
+  return iLevel;
+}
+
+bool CFDE_XMLNode::InsertNodeItem(CFDE_XMLNode::NodeItem eItem,
+                                  CFDE_XMLNode* pNode) {
+  switch (eItem) {
+    case CFDE_XMLNode::NextSibling: {
+      pNode->m_pParent = m_pParent;
+      pNode->m_pNext = m_pNext;
+      pNode->m_pPrior = this;
+      if (m_pNext) {
+        m_pNext->m_pPrior = pNode;
+      }
+      m_pNext = pNode;
+      return true;
+    }
+    case CFDE_XMLNode::PriorSibling: {
+      pNode->m_pParent = m_pParent;
+      pNode->m_pNext = this;
+      pNode->m_pPrior = m_pPrior;
+      if (m_pPrior) {
+        m_pPrior->m_pNext = pNode;
+      } else if (m_pParent) {
+        m_pParent->m_pChild = pNode;
+      }
+      m_pPrior = pNode;
+      return true;
+    }
+    default:
+      return false;
+  }
+}
+
+CFDE_XMLNode* CFDE_XMLNode::RemoveNodeItem(CFDE_XMLNode::NodeItem eItem) {
+  CFDE_XMLNode* pNode = nullptr;
+  switch (eItem) {
+    case CFDE_XMLNode::NextSibling:
+      if (m_pNext) {
+        pNode = m_pNext;
+        m_pNext = pNode->m_pNext;
+        if (m_pNext) {
+          m_pNext->m_pPrior = this;
+        }
+        pNode->m_pParent = nullptr;
+        pNode->m_pNext = nullptr;
+        pNode->m_pPrior = nullptr;
+      }
+      break;
+    default:
+      break;
+  }
+  return pNode;
+}
+
+CFDE_XMLNode* CFDE_XMLNode::Clone(bool bRecursive) {
+  return nullptr;
+}
+
+void CFDE_XMLNode::SaveXMLNode(const CFX_RetainPtr<IFGAS_Stream>& pXMLStream) {
+  CFDE_XMLNode* pNode = (CFDE_XMLNode*)this;
+  switch (pNode->GetType()) {
+    case FDE_XMLNODE_Instruction: {
+      CFX_WideString ws;
+      CFDE_XMLInstruction* pInstruction = (CFDE_XMLInstruction*)pNode;
+      if (pInstruction->m_wsTarget.CompareNoCase(L"xml") == 0) {
+        ws = L"<?xml version=\"1.0\" encoding=\"";
+        uint16_t wCodePage = pXMLStream->GetCodePage();
+        if (wCodePage == FX_CODEPAGE_UTF16LE) {
+          ws += L"UTF-16";
+        } else if (wCodePage == FX_CODEPAGE_UTF16BE) {
+          ws += L"UTF-16be";
+        } else {
+          ws += L"UTF-8";
+        }
+        ws += L"\"?>";
+        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+      } else {
+        ws.Format(L"<?%s", pInstruction->m_wsTarget.c_str());
+        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+        std::vector<CFX_WideString>& attributes = pInstruction->m_Attributes;
+        int32_t i;
+        int32_t iCount = pdfium::CollectionSize<int32_t>(attributes);
+        CFX_WideString wsValue;
+        for (i = 0; i < iCount; i += 2) {
+          ws = L" ";
+          ws += attributes[i];
+          ws += L"=\"";
+          wsValue = attributes[i + 1];
+          wsValue.Replace(L"&", L"&amp;");
+          wsValue.Replace(L"<", L"&lt;");
+          wsValue.Replace(L">", L"&gt;");
+          wsValue.Replace(L"\'", L"&apos;");
+          wsValue.Replace(L"\"", L"&quot;");
+          ws += wsValue;
+          ws += L"\"";
+          pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+        }
+        std::vector<CFX_WideString>& targetdata = pInstruction->m_TargetData;
+        iCount = pdfium::CollectionSize<int32_t>(targetdata);
+        for (i = 0; i < iCount; i++) {
+          ws = L" \"";
+          ws += targetdata[i];
+          ws += L"\"";
+          pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+        }
+        ws = L"?>";
+        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+      }
+    } break;
+    case FDE_XMLNODE_Element: {
+      CFX_WideString ws;
+      ws = L"<";
+      ws += ((CFDE_XMLElement*)pNode)->m_wsTag;
+      pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+      std::vector<CFX_WideString>& attributes =
+          static_cast<CFDE_XMLElement*>(pNode)->m_Attributes;
+      int32_t iCount = pdfium::CollectionSize<int32_t>(attributes);
+      CFX_WideString wsValue;
+      for (int32_t i = 0; i < iCount; i += 2) {
+        ws = L" ";
+        ws += attributes[i];
+        ws += L"=\"";
+        wsValue = attributes[i + 1];
+        wsValue.Replace(L"&", L"&amp;");
+        wsValue.Replace(L"<", L"&lt;");
+        wsValue.Replace(L">", L"&gt;");
+        wsValue.Replace(L"\'", L"&apos;");
+        wsValue.Replace(L"\"", L"&quot;");
+        ws += wsValue;
+        ws += L"\"";
+        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+      }
+      if (pNode->m_pChild) {
+        ws = L"\n>";
+        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+        CFDE_XMLNode* pChild = pNode->m_pChild;
+        while (pChild) {
+          pChild->SaveXMLNode(pXMLStream);
+          pChild = pChild->m_pNext;
+        }
+        ws = L"</";
+        ws += ((CFDE_XMLElement*)pNode)->m_wsTag;
+        ws += L"\n>";
+      } else {
+        ws = L"\n/>";
+      }
+      pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+    } break;
+    case FDE_XMLNODE_Text: {
+      CFX_WideString ws = ((CFDE_XMLText*)pNode)->m_wsText;
+      ws.Replace(L"&", L"&amp;");
+      ws.Replace(L"<", L"&lt;");
+      ws.Replace(L">", L"&gt;");
+      ws.Replace(L"\'", L"&apos;");
+      ws.Replace(L"\"", L"&quot;");
+      pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+    } break;
+    case FDE_XMLNODE_CharData: {
+      CFX_WideString ws = L"<![CDATA[";
+      ws += ((CFDE_XMLCharData*)pNode)->m_wsCharData;
+      ws += L"]]>";
+      pXMLStream->WriteString(ws.c_str(), ws.GetLength());
+    } break;
+    case FDE_XMLNODE_Unknown:
+      break;
+    default:
+      break;
+  }
+}
+
+void CFDE_XMLNode::CloneChildren(CFDE_XMLNode* pClone) {
+  if (!m_pChild) {
+    return;
+  }
+  CFDE_XMLNode* pNext = m_pChild;
+  CFDE_XMLNode* pCloneNext = pNext->Clone(true);
+  pClone->InsertChildNode(pCloneNext);
+  pNext = pNext->m_pNext;
+  while (pNext) {
+    CFDE_XMLNode* pChild = pNext->Clone(true);
+    pCloneNext->InsertNodeItem(CFDE_XMLNode::NextSibling, pChild);
+    pCloneNext = pChild;
+    pNext = pNext->m_pNext;
+  }
+}
diff --git a/xfa/fde/xml/cfde_xmlnode.h b/xfa/fde/xml/cfde_xmlnode.h
new file mode 100644
index 0000000..178150f
--- /dev/null
+++ b/xfa/fde/xml/cfde_xmlnode.h
@@ -0,0 +1,74 @@
+// 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
+
+#ifndef XFA_FDE_XML_CFDE_XMLNODE_H_
+#define XFA_FDE_XML_CFDE_XMLNODE_H_
+
+#include "core/fxcrt/cfx_retain_ptr.h"
+#include "xfa/fgas/crt/ifgas_stream.h"
+
+enum FDE_XMLNODETYPE {
+  FDE_XMLNODE_Unknown = 0,
+  FDE_XMLNODE_Instruction,
+  FDE_XMLNODE_Element,
+  FDE_XMLNODE_Text,
+  FDE_XMLNODE_CharData,
+};
+
+struct FDE_XMLNODE {
+  int32_t iNodeNum;
+  FDE_XMLNODETYPE eNodeType;
+};
+
+class CFDE_XMLNode {
+ public:
+  enum NodeItem {
+    Root = 0,
+    Parent,
+    FirstSibling,
+    PriorSibling,
+    NextSibling,
+    LastSibling,
+    FirstNeighbor,
+    PriorNeighbor,
+    NextNeighbor,
+    LastNeighbor,
+    FirstChild,
+    LastChild
+  };
+
+  CFDE_XMLNode();
+  virtual ~CFDE_XMLNode();
+
+  virtual FDE_XMLNODETYPE GetType() const;
+  virtual CFDE_XMLNode* Clone(bool bRecursive);
+
+  int32_t CountChildNodes() const;
+  CFDE_XMLNode* GetChildNode(int32_t index) const;
+  int32_t GetChildNodeIndex(CFDE_XMLNode* pNode) const;
+  int32_t InsertChildNode(CFDE_XMLNode* pNode, int32_t index = -1);
+  void RemoveChildNode(CFDE_XMLNode* pNode);
+  void DeleteChildren();
+  void CloneChildren(CFDE_XMLNode* pClone);
+
+  CFDE_XMLNode* GetPath(const wchar_t* pPath,
+                        int32_t iLength = -1,
+                        bool bQualifiedName = true) const;
+
+  int32_t GetNodeLevel() const;
+  CFDE_XMLNode* GetNodeItem(CFDE_XMLNode::NodeItem eItem) const;
+  bool InsertNodeItem(CFDE_XMLNode::NodeItem eItem, CFDE_XMLNode* pNode);
+  CFDE_XMLNode* RemoveNodeItem(CFDE_XMLNode::NodeItem eItem);
+
+  void SaveXMLNode(const CFX_RetainPtr<IFGAS_Stream>& pXMLStream);
+
+  CFDE_XMLNode* m_pParent;
+  CFDE_XMLNode* m_pChild;
+  CFDE_XMLNode* m_pPrior;
+  CFDE_XMLNode* m_pNext;
+};
+
+#endif  // XFA_FDE_XML_CFDE_XMLNODE_H_
diff --git a/xfa/fde/xml/cfde_xml_parser.cpp b/xfa/fde/xml/cfde_xmlparser.cpp
similarity index 95%
rename from xfa/fde/xml/cfde_xml_parser.cpp
rename to xfa/fde/xml/cfde_xmlparser.cpp
index 840c34a..db85021 100644
--- a/xfa/fde/xml/cfde_xml_parser.cpp
+++ b/xfa/fde/xml/cfde_xmlparser.cpp
@@ -4,9 +4,15 @@
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
-#include "xfa/fde/xml/cfde_xml_parser.h"
+#include "xfa/fde/xml/cfde_xmlparser.h"
 
+#include "core/fxcrt/fx_basic.h"
 #include "third_party/base/ptr_util.h"
+#include "xfa/fde/xml/cfde_xmlchardata.h"
+#include "xfa/fde/xml/cfde_xmlelement.h"
+#include "xfa/fde/xml/cfde_xmlinstruction.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
+#include "xfa/fde/xml/cfde_xmltext.h"
 
 CFDE_XMLParser::CFDE_XMLParser(CFDE_XMLNode* pParent,
                                const CFX_RetainPtr<IFGAS_Stream>& pStream)
diff --git a/xfa/fde/xml/cfde_xml_parser.h b/xfa/fde/xml/cfde_xmlparser.h
similarity index 77%
rename from xfa/fde/xml/cfde_xml_parser.h
rename to xfa/fde/xml/cfde_xmlparser.h
index cd8ccbe..42f590c 100644
--- a/xfa/fde/xml/cfde_xml_parser.h
+++ b/xfa/fde/xml/cfde_xmlparser.h
@@ -4,14 +4,18 @@
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
-#ifndef XFA_FDE_XML_CFDE_XML_PARSER_H_
-#define XFA_FDE_XML_CFDE_XML_PARSER_H_
+#ifndef XFA_FDE_XML_CFDE_XMLPARSER_H_
+#define XFA_FDE_XML_CFDE_XMLPARSER_H_
 
 #include <memory>
 #include <stack>
 
-#include "xfa/fde/xml/fde_xml_imp.h"
+#include "core/fxcrt/cfx_retain_ptr.h"
+#include "core/fxcrt/fx_string.h"
+#include "xfa/fde/xml/cfde_xmlsyntaxparser.h"
 
+class CFDE_XMLElement;
+class CFDE_XMLNode;
 class IFGAS_Stream;
 class IFX_Pause;
 
@@ -40,4 +44,4 @@
   FDE_XmlSyntaxResult m_syntaxParserResult;
 };
 
-#endif  // XFA_FDE_XML_CFDE_XML_PARSER_H_
+#endif  // XFA_FDE_XML_CFDE_XMLPARSER_H_
diff --git a/xfa/fde/xml/cfde_xmlsyntaxparser.cpp b/xfa/fde/xml/cfde_xmlsyntaxparser.cpp
new file mode 100644
index 0000000..45a1edd
--- /dev/null
+++ b/xfa/fde/xml/cfde_xmlsyntaxparser.cpp
@@ -0,0 +1,703 @@
+// 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 "xfa/fde/xml/cfde_xmlsyntaxparser.h"
+
+#include <algorithm>
+
+#include "core/fxcrt/fx_ext.h"
+#include "core/fxcrt/fx_safe_types.h"
+
+namespace {
+
+const uint32_t kMaxCharRange = 0x10ffff;
+
+bool IsXMLWhiteSpace(wchar_t ch) {
+  return ch == L' ' || ch == 0x0A || ch == 0x0D || ch == 0x09;
+}
+
+struct FDE_XMLNAMECHAR {
+  uint16_t wStart;
+  uint16_t wEnd;
+  bool bStartChar;
+};
+
+const FDE_XMLNAMECHAR g_XMLNameChars[] = {
+    {L'-', L'.', false},    {L'0', L'9', false},     {L':', L':', false},
+    {L'A', L'Z', true},     {L'_', L'_', true},      {L'a', L'z', true},
+    {0xB7, 0xB7, false},    {0xC0, 0xD6, true},      {0xD8, 0xF6, true},
+    {0xF8, 0x02FF, true},   {0x0300, 0x036F, false}, {0x0370, 0x037D, true},
+    {0x037F, 0x1FFF, true}, {0x200C, 0x200D, true},  {0x203F, 0x2040, false},
+    {0x2070, 0x218F, true}, {0x2C00, 0x2FEF, true},  {0x3001, 0xD7FF, true},
+    {0xF900, 0xFDCF, true}, {0xFDF0, 0xFFFD, true},
+};
+
+bool IsXMLNameChar(wchar_t ch, bool bFirstChar) {
+  int32_t iStart = 0;
+  int32_t iEnd = FX_ArraySize(g_XMLNameChars) - 1;
+  while (iStart <= iEnd) {
+    int32_t iMid = (iStart + iEnd) / 2;
+    if (ch < g_XMLNameChars[iMid].wStart) {
+      iEnd = iMid - 1;
+    } else if (ch > g_XMLNameChars[iMid].wEnd) {
+      iStart = iMid + 1;
+    } else {
+      return bFirstChar ? g_XMLNameChars[iMid].bStartChar : true;
+    }
+  }
+  return false;
+}
+
+int32_t GetUTF8EncodeLength(const wchar_t* pSrc, int32_t iSrcLen) {
+  uint32_t unicode = 0;
+  int32_t iDstNum = 0;
+  while (iSrcLen-- > 0) {
+    unicode = *pSrc++;
+    int nbytes = 0;
+    if ((uint32_t)unicode < 0x80) {
+      nbytes = 1;
+    } else if ((uint32_t)unicode < 0x800) {
+      nbytes = 2;
+    } else if ((uint32_t)unicode < 0x10000) {
+      nbytes = 3;
+    } else if ((uint32_t)unicode < 0x200000) {
+      nbytes = 4;
+    } else if ((uint32_t)unicode < 0x4000000) {
+      nbytes = 5;
+    } else {
+      nbytes = 6;
+    }
+    iDstNum += nbytes;
+  }
+  return iDstNum;
+}
+
+}  // namespace
+
+CFDE_XMLSyntaxParser::CFDE_XMLSyntaxParser()
+    : m_pStream(nullptr),
+      m_iXMLPlaneSize(-1),
+      m_iCurrentPos(0),
+      m_iCurrentNodeNum(-1),
+      m_iLastNodeNum(-1),
+      m_iParsedChars(0),
+      m_iParsedBytes(0),
+      m_pBuffer(nullptr),
+      m_iBufferChars(0),
+      m_bEOS(false),
+      m_pStart(nullptr),
+      m_pEnd(nullptr),
+      m_iAllocStep(m_BlockBuffer.GetAllocStep()),
+      m_iDataLength(m_BlockBuffer.GetDataLengthRef()),
+      m_pCurrentBlock(nullptr),
+      m_iIndexInBlock(0),
+      m_iTextDataLength(0),
+      m_syntaxParserResult(FDE_XmlSyntaxResult::None),
+      m_syntaxParserState(FDE_XmlSyntaxState::Text),
+      m_wQuotationMark(0),
+      m_iEntityStart(-1) {
+  m_CurNode.iNodeNum = -1;
+  m_CurNode.eNodeType = FDE_XMLNODE_Unknown;
+}
+
+void CFDE_XMLSyntaxParser::Init(const CFX_RetainPtr<IFGAS_Stream>& pStream,
+                                int32_t iXMLPlaneSize,
+                                int32_t iTextDataSize) {
+  ASSERT(!m_pStream && !m_pBuffer);
+  ASSERT(pStream && iXMLPlaneSize > 0);
+  int32_t iStreamLength = pStream->GetLength();
+  ASSERT(iStreamLength > 0);
+  m_pStream = pStream;
+  m_iXMLPlaneSize = std::min(iXMLPlaneSize, iStreamLength);
+  uint8_t bom[4];
+  m_iCurrentPos = m_pStream->GetBOM(bom);
+  ASSERT(!m_pBuffer);
+
+  FX_SAFE_INT32 alloc_size_safe = m_iXMLPlaneSize;
+  alloc_size_safe += 1;  // For NUL.
+  if (!alloc_size_safe.IsValid() || alloc_size_safe.ValueOrDie() <= 0) {
+    m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
+    return;
+  }
+
+  m_pBuffer = FX_Alloc(
+      wchar_t, pdfium::base::ValueOrDieForType<size_t>(alloc_size_safe));
+  m_pStart = m_pEnd = m_pBuffer;
+  ASSERT(!m_BlockBuffer.IsInitialized());
+  m_BlockBuffer.InitBuffer();
+  m_pCurrentBlock = m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+  m_iParsedBytes = m_iParsedChars = 0;
+  m_iBufferChars = 0;
+}
+
+FDE_XmlSyntaxResult CFDE_XMLSyntaxParser::DoSyntaxParse() {
+  if (m_syntaxParserResult == FDE_XmlSyntaxResult::Error ||
+      m_syntaxParserResult == FDE_XmlSyntaxResult::EndOfString) {
+    return m_syntaxParserResult;
+  }
+  ASSERT(m_pStream && m_pBuffer && m_BlockBuffer.IsInitialized());
+  int32_t iStreamLength = m_pStream->GetLength();
+  int32_t iPos;
+
+  FDE_XmlSyntaxResult syntaxParserResult = FDE_XmlSyntaxResult::None;
+  while (true) {
+    if (m_pStart >= m_pEnd) {
+      if (m_bEOS || m_iCurrentPos >= iStreamLength) {
+        m_syntaxParserResult = FDE_XmlSyntaxResult::EndOfString;
+        return m_syntaxParserResult;
+      }
+      m_iParsedChars += (m_pEnd - m_pBuffer);
+      m_iParsedBytes = m_iCurrentPos;
+      if (m_pStream->GetPosition() != m_iCurrentPos) {
+        m_pStream->Seek(FX_STREAMSEEK_Begin, m_iCurrentPos);
+      }
+      m_iBufferChars =
+          m_pStream->ReadString(m_pBuffer, m_iXMLPlaneSize, m_bEOS);
+      iPos = m_pStream->GetPosition();
+      if (m_iBufferChars < 1) {
+        m_iCurrentPos = iStreamLength;
+        m_syntaxParserResult = FDE_XmlSyntaxResult::EndOfString;
+        return m_syntaxParserResult;
+      }
+      m_iCurrentPos = iPos;
+      m_pStart = m_pBuffer;
+      m_pEnd = m_pBuffer + m_iBufferChars;
+    }
+
+    while (m_pStart < m_pEnd) {
+      wchar_t ch = *m_pStart;
+      switch (m_syntaxParserState) {
+        case FDE_XmlSyntaxState::Text:
+          if (ch == L'<') {
+            if (m_iDataLength > 0) {
+              m_iTextDataLength = m_iDataLength;
+              m_BlockBuffer.Reset();
+              m_pCurrentBlock =
+                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+              m_iEntityStart = -1;
+              syntaxParserResult = FDE_XmlSyntaxResult::Text;
+            } else {
+              m_pStart++;
+              m_syntaxParserState = FDE_XmlSyntaxState::Node;
+            }
+          } else {
+            ParseTextChar(ch);
+          }
+          break;
+        case FDE_XmlSyntaxState::Node:
+          if (ch == L'!') {
+            m_pStart++;
+            m_syntaxParserState = FDE_XmlSyntaxState::SkipCommentOrDecl;
+          } else if (ch == L'/') {
+            m_pStart++;
+            m_syntaxParserState = FDE_XmlSyntaxState::CloseElement;
+          } else if (ch == L'?') {
+            m_iLastNodeNum++;
+            m_iCurrentNodeNum = m_iLastNodeNum;
+            m_CurNode.iNodeNum = m_iLastNodeNum;
+            m_CurNode.eNodeType = FDE_XMLNODE_Instruction;
+            m_XMLNodeStack.push(m_CurNode);
+            m_pStart++;
+            m_syntaxParserState = FDE_XmlSyntaxState::Target;
+            syntaxParserResult = FDE_XmlSyntaxResult::InstructionOpen;
+          } else {
+            m_iLastNodeNum++;
+            m_iCurrentNodeNum = m_iLastNodeNum;
+            m_CurNode.iNodeNum = m_iLastNodeNum;
+            m_CurNode.eNodeType = FDE_XMLNODE_Element;
+            m_XMLNodeStack.push(m_CurNode);
+            m_syntaxParserState = FDE_XmlSyntaxState::Tag;
+            syntaxParserResult = FDE_XmlSyntaxResult::ElementOpen;
+          }
+          break;
+        case FDE_XmlSyntaxState::Target:
+        case FDE_XmlSyntaxState::Tag:
+          if (!IsXMLNameChar(ch, m_iDataLength < 1)) {
+            if (m_iDataLength < 1) {
+              m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
+              return m_syntaxParserResult;
+            } else {
+              m_iTextDataLength = m_iDataLength;
+              m_BlockBuffer.Reset();
+              m_pCurrentBlock =
+                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+              if (m_syntaxParserState != FDE_XmlSyntaxState::Target) {
+                syntaxParserResult = FDE_XmlSyntaxResult::TagName;
+              } else {
+                syntaxParserResult = FDE_XmlSyntaxResult::TargetName;
+              }
+              m_syntaxParserState = FDE_XmlSyntaxState::AttriName;
+            }
+          } else {
+            if (m_iIndexInBlock == m_iAllocStep) {
+              m_pCurrentBlock =
+                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+              if (!m_pCurrentBlock) {
+                return FDE_XmlSyntaxResult::Error;
+              }
+            }
+            m_pCurrentBlock[m_iIndexInBlock++] = ch;
+            m_iDataLength++;
+            m_pStart++;
+          }
+          break;
+        case FDE_XmlSyntaxState::AttriName:
+          if (m_iDataLength < 1 && IsXMLWhiteSpace(ch)) {
+            m_pStart++;
+            break;
+          }
+          if (!IsXMLNameChar(ch, m_iDataLength < 1)) {
+            if (m_iDataLength < 1) {
+              if (m_CurNode.eNodeType == FDE_XMLNODE_Element) {
+                if (ch == L'>' || ch == L'/') {
+                  m_syntaxParserState = FDE_XmlSyntaxState::BreakElement;
+                  break;
+                }
+              } else if (m_CurNode.eNodeType == FDE_XMLNODE_Instruction) {
+                if (ch == L'?') {
+                  m_syntaxParserState = FDE_XmlSyntaxState::CloseInstruction;
+                  m_pStart++;
+                } else {
+                  m_syntaxParserState = FDE_XmlSyntaxState::TargetData;
+                }
+                break;
+              }
+              m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
+              return m_syntaxParserResult;
+            } else {
+              if (m_CurNode.eNodeType == FDE_XMLNODE_Instruction) {
+                if (ch != '=' && !IsXMLWhiteSpace(ch)) {
+                  m_syntaxParserState = FDE_XmlSyntaxState::TargetData;
+                  break;
+                }
+              }
+              m_iTextDataLength = m_iDataLength;
+              m_BlockBuffer.Reset();
+              m_pCurrentBlock =
+                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+              m_syntaxParserState = FDE_XmlSyntaxState::AttriEqualSign;
+              syntaxParserResult = FDE_XmlSyntaxResult::AttriName;
+            }
+          } else {
+            if (m_iIndexInBlock == m_iAllocStep) {
+              m_pCurrentBlock =
+                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+              if (!m_pCurrentBlock) {
+                return FDE_XmlSyntaxResult::Error;
+              }
+            }
+            m_pCurrentBlock[m_iIndexInBlock++] = ch;
+            m_iDataLength++;
+            m_pStart++;
+          }
+          break;
+        case FDE_XmlSyntaxState::AttriEqualSign:
+          if (IsXMLWhiteSpace(ch)) {
+            m_pStart++;
+            break;
+          }
+          if (ch != L'=') {
+            if (m_CurNode.eNodeType == FDE_XMLNODE_Instruction) {
+              m_syntaxParserState = FDE_XmlSyntaxState::TargetData;
+              break;
+            }
+            m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
+            return m_syntaxParserResult;
+          } else {
+            m_syntaxParserState = FDE_XmlSyntaxState::AttriQuotation;
+            m_pStart++;
+          }
+          break;
+        case FDE_XmlSyntaxState::AttriQuotation:
+          if (IsXMLWhiteSpace(ch)) {
+            m_pStart++;
+            break;
+          }
+          if (ch != L'\"' && ch != L'\'') {
+            m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
+            return m_syntaxParserResult;
+          } else {
+            m_wQuotationMark = ch;
+            m_syntaxParserState = FDE_XmlSyntaxState::AttriValue;
+            m_pStart++;
+          }
+          break;
+        case FDE_XmlSyntaxState::AttriValue:
+          if (ch == m_wQuotationMark) {
+            if (m_iEntityStart > -1) {
+              m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
+              return m_syntaxParserResult;
+            }
+            m_iTextDataLength = m_iDataLength;
+            m_wQuotationMark = 0;
+            m_BlockBuffer.Reset();
+            m_pCurrentBlock = m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+            m_pStart++;
+            m_syntaxParserState = FDE_XmlSyntaxState::AttriName;
+            syntaxParserResult = FDE_XmlSyntaxResult::AttriValue;
+          } else {
+            ParseTextChar(ch);
+          }
+          break;
+        case FDE_XmlSyntaxState::CloseInstruction:
+          if (ch != L'>') {
+            if (m_iIndexInBlock == m_iAllocStep) {
+              m_pCurrentBlock =
+                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+              if (!m_pCurrentBlock) {
+                return FDE_XmlSyntaxResult::Error;
+              }
+            }
+            m_pCurrentBlock[m_iIndexInBlock++] = ch;
+            m_iDataLength++;
+            m_syntaxParserState = FDE_XmlSyntaxState::TargetData;
+          } else if (m_iDataLength > 0) {
+            m_iTextDataLength = m_iDataLength;
+            m_BlockBuffer.Reset();
+            m_pCurrentBlock = m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+            syntaxParserResult = FDE_XmlSyntaxResult::TargetData;
+          } else {
+            m_pStart++;
+            if (m_XMLNodeStack.empty()) {
+              m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
+              return m_syntaxParserResult;
+            }
+            m_XMLNodeStack.pop();
+            if (!m_XMLNodeStack.empty()) {
+              m_CurNode = m_XMLNodeStack.top();
+            } else {
+              m_CurNode.iNodeNum = -1;
+              m_CurNode.eNodeType = FDE_XMLNODE_Unknown;
+            }
+            m_iCurrentNodeNum = m_CurNode.iNodeNum;
+            m_BlockBuffer.Reset();
+            m_pCurrentBlock = m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+            m_syntaxParserState = FDE_XmlSyntaxState::Text;
+            syntaxParserResult = FDE_XmlSyntaxResult::InstructionClose;
+          }
+          break;
+        case FDE_XmlSyntaxState::BreakElement:
+          if (ch == L'>') {
+            m_syntaxParserState = FDE_XmlSyntaxState::Text;
+            syntaxParserResult = FDE_XmlSyntaxResult::ElementBreak;
+          } else if (ch == L'/') {
+            m_syntaxParserState = FDE_XmlSyntaxState::CloseElement;
+          } else {
+            m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
+            return m_syntaxParserResult;
+          }
+          m_pStart++;
+          break;
+        case FDE_XmlSyntaxState::CloseElement:
+          if (!IsXMLNameChar(ch, m_iDataLength < 1)) {
+            if (ch == L'>') {
+              if (m_XMLNodeStack.empty()) {
+                m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
+                return m_syntaxParserResult;
+              }
+              m_XMLNodeStack.pop();
+              if (!m_XMLNodeStack.empty()) {
+                m_CurNode = m_XMLNodeStack.top();
+              } else {
+                m_CurNode.iNodeNum = -1;
+                m_CurNode.eNodeType = FDE_XMLNODE_Unknown;
+              }
+              m_iCurrentNodeNum = m_CurNode.iNodeNum;
+              m_iTextDataLength = m_iDataLength;
+              m_BlockBuffer.Reset();
+              m_pCurrentBlock =
+                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+              m_syntaxParserState = FDE_XmlSyntaxState::Text;
+              syntaxParserResult = FDE_XmlSyntaxResult::ElementClose;
+            } else if (!IsXMLWhiteSpace(ch)) {
+              m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
+              return m_syntaxParserResult;
+            }
+          } else {
+            if (m_iIndexInBlock == m_iAllocStep) {
+              m_pCurrentBlock =
+                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+              if (!m_pCurrentBlock) {
+                return FDE_XmlSyntaxResult::Error;
+              }
+            }
+            m_pCurrentBlock[m_iIndexInBlock++] = ch;
+            m_iDataLength++;
+          }
+          m_pStart++;
+          break;
+        case FDE_XmlSyntaxState::SkipCommentOrDecl:
+          if (FXSYS_wcsnicmp(m_pStart, L"--", 2) == 0) {
+            m_pStart += 2;
+            m_syntaxParserState = FDE_XmlSyntaxState::SkipComment;
+          } else if (FXSYS_wcsnicmp(m_pStart, L"[CDATA[", 7) == 0) {
+            m_pStart += 7;
+            m_syntaxParserState = FDE_XmlSyntaxState::SkipCData;
+          } else {
+            m_syntaxParserState = FDE_XmlSyntaxState::SkipDeclNode;
+            m_SkipChar = L'>';
+            m_SkipStack.push(L'>');
+          }
+          break;
+        case FDE_XmlSyntaxState::SkipCData: {
+          if (FXSYS_wcsnicmp(m_pStart, L"]]>", 3) == 0) {
+            m_pStart += 3;
+            syntaxParserResult = FDE_XmlSyntaxResult::CData;
+            m_iTextDataLength = m_iDataLength;
+            m_BlockBuffer.Reset();
+            m_pCurrentBlock = m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+            m_syntaxParserState = FDE_XmlSyntaxState::Text;
+          } else {
+            if (m_iIndexInBlock == m_iAllocStep) {
+              m_pCurrentBlock =
+                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+              if (!m_pCurrentBlock)
+                return FDE_XmlSyntaxResult::Error;
+            }
+            m_pCurrentBlock[m_iIndexInBlock++] = ch;
+            m_iDataLength++;
+            m_pStart++;
+          }
+          break;
+        }
+        case FDE_XmlSyntaxState::SkipDeclNode:
+          if (m_SkipChar == L'\'' || m_SkipChar == L'\"') {
+            m_pStart++;
+            if (ch != m_SkipChar)
+              break;
+
+            m_SkipStack.pop();
+            if (m_SkipStack.empty())
+              m_syntaxParserState = FDE_XmlSyntaxState::Text;
+            else
+              m_SkipChar = m_SkipStack.top();
+          } else {
+            switch (ch) {
+              case L'<':
+                m_SkipChar = L'>';
+                m_SkipStack.push(L'>');
+                break;
+              case L'[':
+                m_SkipChar = L']';
+                m_SkipStack.push(L']');
+                break;
+              case L'(':
+                m_SkipChar = L')';
+                m_SkipStack.push(L')');
+                break;
+              case L'\'':
+                m_SkipChar = L'\'';
+                m_SkipStack.push(L'\'');
+                break;
+              case L'\"':
+                m_SkipChar = L'\"';
+                m_SkipStack.push(L'\"');
+                break;
+              default:
+                if (ch == m_SkipChar) {
+                  m_SkipStack.pop();
+                  if (m_SkipStack.empty()) {
+                    if (m_iDataLength >= 9) {
+                      CFX_WideString wsHeader;
+                      m_BlockBuffer.GetTextData(wsHeader, 0, 7);
+                    }
+                    m_iTextDataLength = m_iDataLength;
+                    m_BlockBuffer.Reset();
+                    m_pCurrentBlock =
+                        m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+                    m_syntaxParserState = FDE_XmlSyntaxState::Text;
+                  } else {
+                    m_SkipChar = m_SkipStack.top();
+                  }
+                }
+                break;
+            }
+            if (!m_SkipStack.empty()) {
+              if (m_iIndexInBlock == m_iAllocStep) {
+                m_pCurrentBlock =
+                    m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+                if (!m_pCurrentBlock) {
+                  return FDE_XmlSyntaxResult::Error;
+                }
+              }
+              m_pCurrentBlock[m_iIndexInBlock++] = ch;
+              m_iDataLength++;
+            }
+            m_pStart++;
+          }
+          break;
+        case FDE_XmlSyntaxState::SkipComment:
+          if (FXSYS_wcsnicmp(m_pStart, L"-->", 3) == 0) {
+            m_pStart += 2;
+            m_syntaxParserState = FDE_XmlSyntaxState::Text;
+          }
+
+          m_pStart++;
+          break;
+        case FDE_XmlSyntaxState::TargetData:
+          if (IsXMLWhiteSpace(ch)) {
+            if (m_iDataLength < 1) {
+              m_pStart++;
+              break;
+            } else if (m_wQuotationMark == 0) {
+              m_iTextDataLength = m_iDataLength;
+              m_wQuotationMark = 0;
+              m_BlockBuffer.Reset();
+              m_pCurrentBlock =
+                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+              m_pStart++;
+              syntaxParserResult = FDE_XmlSyntaxResult::TargetData;
+              break;
+            }
+          }
+          if (ch == '?') {
+            m_syntaxParserState = FDE_XmlSyntaxState::CloseInstruction;
+            m_pStart++;
+          } else if (ch == '\"') {
+            if (m_wQuotationMark == 0) {
+              m_wQuotationMark = ch;
+              m_pStart++;
+            } else if (ch == m_wQuotationMark) {
+              m_iTextDataLength = m_iDataLength;
+              m_wQuotationMark = 0;
+              m_BlockBuffer.Reset();
+              m_pCurrentBlock =
+                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+              m_pStart++;
+              syntaxParserResult = FDE_XmlSyntaxResult::TargetData;
+            } else {
+              m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
+              return m_syntaxParserResult;
+            }
+          } else {
+            if (m_iIndexInBlock == m_iAllocStep) {
+              m_pCurrentBlock =
+                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+              if (!m_pCurrentBlock) {
+                return FDE_XmlSyntaxResult::Error;
+              }
+            }
+            m_pCurrentBlock[m_iIndexInBlock++] = ch;
+            m_iDataLength++;
+            m_pStart++;
+          }
+          break;
+        default:
+          break;
+      }
+      if (syntaxParserResult != FDE_XmlSyntaxResult::None)
+        return syntaxParserResult;
+    }
+  }
+  return FDE_XmlSyntaxResult::Text;
+}
+
+CFDE_XMLSyntaxParser::~CFDE_XMLSyntaxParser() {
+  m_pCurrentBlock = nullptr;
+  FX_Free(m_pBuffer);
+}
+
+int32_t CFDE_XMLSyntaxParser::GetStatus() const {
+  if (!m_pStream)
+    return -1;
+
+  int32_t iStreamLength = m_pStream->GetLength();
+  if (iStreamLength < 1)
+    return 100;
+
+  if (m_syntaxParserResult == FDE_XmlSyntaxResult::Error)
+    return -1;
+
+  if (m_syntaxParserResult == FDE_XmlSyntaxResult::EndOfString)
+    return 100;
+  return m_iParsedBytes * 100 / iStreamLength;
+}
+
+FX_FILESIZE CFDE_XMLSyntaxParser::GetCurrentBinaryPos() const {
+  if (!m_pStream)
+    return 0;
+
+  int32_t nSrcLen = m_pStart - m_pBuffer;
+  int32_t nDstLen = GetUTF8EncodeLength(m_pBuffer, nSrcLen);
+  return m_iParsedBytes + nDstLen;
+}
+
+void CFDE_XMLSyntaxParser::ParseTextChar(wchar_t character) {
+  if (m_iIndexInBlock == m_iAllocStep) {
+    m_pCurrentBlock = m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+    if (!m_pCurrentBlock) {
+      return;
+    }
+  }
+  m_pCurrentBlock[m_iIndexInBlock++] = character;
+  m_iDataLength++;
+  if (m_iEntityStart > -1 && character == L';') {
+    CFX_WideString csEntity;
+    m_BlockBuffer.GetTextData(csEntity, m_iEntityStart + 1,
+                              (m_iDataLength - 1) - m_iEntityStart - 1);
+    int32_t iLen = csEntity.GetLength();
+    if (iLen > 0) {
+      if (csEntity[0] == L'#') {
+        uint32_t ch = 0;
+        wchar_t w;
+        if (iLen > 1 && csEntity[1] == L'x') {
+          for (int32_t i = 2; i < iLen; i++) {
+            w = csEntity[i];
+            if (w >= L'0' && w <= L'9') {
+              ch = (ch << 4) + w - L'0';
+            } else if (w >= L'A' && w <= L'F') {
+              ch = (ch << 4) + w - 55;
+            } else if (w >= L'a' && w <= L'f') {
+              ch = (ch << 4) + w - 87;
+            } else {
+              break;
+            }
+          }
+        } else {
+          for (int32_t i = 1; i < iLen; i++) {
+            w = csEntity[i];
+            if (w < L'0' || w > L'9')
+              break;
+            ch = ch * 10 + w - L'0';
+          }
+        }
+        if (ch > kMaxCharRange)
+          ch = ' ';
+
+        character = static_cast<wchar_t>(ch);
+        if (character != 0) {
+          m_BlockBuffer.SetTextChar(m_iEntityStart, character);
+          m_iEntityStart++;
+        }
+      } else {
+        if (csEntity.Compare(L"amp") == 0) {
+          m_BlockBuffer.SetTextChar(m_iEntityStart, L'&');
+          m_iEntityStart++;
+        } else if (csEntity.Compare(L"lt") == 0) {
+          m_BlockBuffer.SetTextChar(m_iEntityStart, L'<');
+          m_iEntityStart++;
+        } else if (csEntity.Compare(L"gt") == 0) {
+          m_BlockBuffer.SetTextChar(m_iEntityStart, L'>');
+          m_iEntityStart++;
+        } else if (csEntity.Compare(L"apos") == 0) {
+          m_BlockBuffer.SetTextChar(m_iEntityStart, L'\'');
+          m_iEntityStart++;
+        } else if (csEntity.Compare(L"quot") == 0) {
+          m_BlockBuffer.SetTextChar(m_iEntityStart, L'\"');
+          m_iEntityStart++;
+        }
+      }
+    }
+    m_BlockBuffer.DeleteTextChars(m_iDataLength - m_iEntityStart, false);
+    m_pCurrentBlock = m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
+    m_iEntityStart = -1;
+  } else {
+    if (m_iEntityStart < 0 && character == L'&') {
+      m_iEntityStart = m_iDataLength - 1;
+    }
+  }
+  m_pStart++;
+}
diff --git a/xfa/fde/xml/cfde_xmlsyntaxparser.h b/xfa/fde/xml/cfde_xmlsyntaxparser.h
new file mode 100644
index 0000000..9e768d0
--- /dev/null
+++ b/xfa/fde/xml/cfde_xmlsyntaxparser.h
@@ -0,0 +1,128 @@
+// 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
+
+#ifndef XFA_FDE_XML_CFDE_XMLSYNTAXPARSER_H_
+#define XFA_FDE_XML_CFDE_XMLSYNTAXPARSER_H_
+
+#include <stack>
+
+#include "core/fxcrt/cfx_blockbuffer.h"
+#include "core/fxcrt/cfx_retain_ptr.h"
+#include "core/fxcrt/fx_string.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
+#include "xfa/fgas/crt/ifgas_stream.h"
+
+enum class FDE_XmlSyntaxResult {
+  None,
+  InstructionOpen,
+  InstructionClose,
+  ElementOpen,
+  ElementBreak,
+  ElementClose,
+  TargetName,
+  TagName,
+  AttriName,
+  AttriValue,
+  Text,
+  CData,
+  TargetData,
+  Error,
+  EndOfString
+};
+
+class CFDE_XMLSyntaxParser {
+ public:
+  CFDE_XMLSyntaxParser();
+  ~CFDE_XMLSyntaxParser();
+
+  void Init(const CFX_RetainPtr<IFGAS_Stream>& pStream,
+            int32_t iXMLPlaneSize,
+            int32_t iTextDataSize = 256);
+
+  FDE_XmlSyntaxResult DoSyntaxParse();
+
+  int32_t GetStatus() const;
+  int32_t GetCurrentPos() const {
+    return m_iParsedChars + (m_pStart - m_pBuffer);
+  }
+  FX_FILESIZE GetCurrentBinaryPos() const;
+  int32_t GetCurrentNodeNumber() const { return m_iCurrentNodeNum; }
+  int32_t GetLastNodeNumber() const { return m_iLastNodeNum; }
+
+  void GetTargetName(CFX_WideString& wsTarget) const {
+    m_BlockBuffer.GetTextData(wsTarget, 0, m_iTextDataLength);
+  }
+  void GetTagName(CFX_WideString& wsTag) const {
+    m_BlockBuffer.GetTextData(wsTag, 0, m_iTextDataLength);
+  }
+  void GetAttributeName(CFX_WideString& wsAttriName) const {
+    m_BlockBuffer.GetTextData(wsAttriName, 0, m_iTextDataLength);
+  }
+  void GetAttributeValue(CFX_WideString& wsAttriValue) const {
+    m_BlockBuffer.GetTextData(wsAttriValue, 0, m_iTextDataLength);
+  }
+  void GetTextData(CFX_WideString& wsText) const {
+    m_BlockBuffer.GetTextData(wsText, 0, m_iTextDataLength);
+  }
+  void GetTargetData(CFX_WideString& wsData) const {
+    m_BlockBuffer.GetTextData(wsData, 0, m_iTextDataLength);
+  }
+
+ protected:
+  enum class FDE_XmlSyntaxState {
+    Text,
+    Node,
+    Target,
+    Tag,
+    AttriName,
+    AttriEqualSign,
+    AttriQuotation,
+    AttriValue,
+    Entity,
+    EntityDecimal,
+    EntityHex,
+    CloseInstruction,
+    BreakElement,
+    CloseElement,
+    SkipDeclNode,
+    DeclCharData,
+    SkipComment,
+    SkipCommentOrDecl,
+    SkipCData,
+    TargetData
+  };
+
+  void ParseTextChar(wchar_t ch);
+
+  CFX_RetainPtr<IFGAS_Stream> m_pStream;
+  int32_t m_iXMLPlaneSize;
+  int32_t m_iCurrentPos;
+  int32_t m_iCurrentNodeNum;
+  int32_t m_iLastNodeNum;
+  int32_t m_iParsedChars;
+  int32_t m_iParsedBytes;
+  wchar_t* m_pBuffer;
+  int32_t m_iBufferChars;
+  bool m_bEOS;
+  wchar_t* m_pStart;
+  wchar_t* m_pEnd;
+  FDE_XMLNODE m_CurNode;
+  std::stack<FDE_XMLNODE> m_XMLNodeStack;
+  CFX_BlockBuffer m_BlockBuffer;
+  int32_t m_iAllocStep;
+  int32_t& m_iDataLength;
+  wchar_t* m_pCurrentBlock;
+  int32_t m_iIndexInBlock;
+  int32_t m_iTextDataLength;
+  FDE_XmlSyntaxResult m_syntaxParserResult;
+  FDE_XmlSyntaxState m_syntaxParserState;
+  wchar_t m_wQuotationMark;
+  int32_t m_iEntityStart;
+  std::stack<wchar_t> m_SkipStack;
+  wchar_t m_SkipChar;
+};
+
+#endif  // XFA_FDE_XML_CFDE_XMLSYNTAXPARSER_H_
diff --git a/xfa/fde/xml/fde_xml_imp_unittest.cpp b/xfa/fde/xml/cfde_xmlsyntaxparser_unittest.cpp
similarity index 99%
rename from xfa/fde/xml/fde_xml_imp_unittest.cpp
rename to xfa/fde/xml/cfde_xmlsyntaxparser_unittest.cpp
index 3bd46ab..9b04028 100644
--- a/xfa/fde/xml/fde_xml_imp_unittest.cpp
+++ b/xfa/fde/xml/cfde_xmlsyntaxparser_unittest.cpp
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "xfa/fde/xml/fde_xml_imp.h"
+#include "xfa/fde/xml/cfde_xmlsyntaxparser.h"
 
 #include <memory>
 
diff --git a/xfa/fde/xml/cfde_xmltext.cpp b/xfa/fde/xml/cfde_xmltext.cpp
new file mode 100644
index 0000000..6bc2d64
--- /dev/null
+++ b/xfa/fde/xml/cfde_xmltext.cpp
@@ -0,0 +1,21 @@
+// 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 "xfa/fde/xml/cfde_xmltext.h"
+
+CFDE_XMLText::CFDE_XMLText(const CFX_WideString& wsText)
+    : CFDE_XMLNode(), m_wsText(wsText) {}
+
+CFDE_XMLText::~CFDE_XMLText() {}
+
+FDE_XMLNODETYPE CFDE_XMLText::GetType() const {
+  return FDE_XMLNODE_Text;
+}
+
+CFDE_XMLNode* CFDE_XMLText::Clone(bool bRecursive) {
+  CFDE_XMLText* pClone = new CFDE_XMLText(m_wsText);
+  return pClone;
+}
diff --git a/xfa/fde/xml/cfde_xmltext.h b/xfa/fde/xml/cfde_xmltext.h
new file mode 100644
index 0000000..6f3945b
--- /dev/null
+++ b/xfa/fde/xml/cfde_xmltext.h
@@ -0,0 +1,28 @@
+// 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
+
+#ifndef XFA_FDE_XML_CFDE_XMLTEXT_H_
+#define XFA_FDE_XML_CFDE_XMLTEXT_H_
+
+#include "core/fxcrt/fx_string.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
+
+class CFDE_XMLText : public CFDE_XMLNode {
+ public:
+  explicit CFDE_XMLText(const CFX_WideString& wsText);
+  ~CFDE_XMLText() override;
+
+  // CFDE_XMLNode
+  FDE_XMLNODETYPE GetType() const override;
+  CFDE_XMLNode* Clone(bool bRecursive) override;
+
+  void GetText(CFX_WideString& wsText) const { wsText = m_wsText; }
+  void SetText(const CFX_WideString& wsText) { m_wsText = wsText; }
+
+  CFX_WideString m_wsText;
+};
+
+#endif  // XFA_FDE_XML_CFDE_XMLTEXT_H_
diff --git a/xfa/fde/xml/fde_xml.h b/xfa/fde/xml/fde_xml.h
deleted file mode 100644
index 399a930..0000000
--- a/xfa/fde/xml/fde_xml.h
+++ /dev/null
@@ -1,45 +0,0 @@
-// Copyright 2014 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
-
-#ifndef XFA_FDE_XML_FDE_XML_H_
-#define XFA_FDE_XML_FDE_XML_H_
-
-#include "core/fxcrt/fx_system.h"
-
-enum class FDE_XmlSyntaxResult {
-  None,
-  InstructionOpen,
-  InstructionClose,
-  ElementOpen,
-  ElementBreak,
-  ElementClose,
-  TargetName,
-  TagName,
-  AttriName,
-  AttriValue,
-  Text,
-  CData,
-  TargetData,
-  Error,
-  EndOfString
-};
-
-enum FDE_XMLNODETYPE {
-  FDE_XMLNODE_Unknown = 0,
-  FDE_XMLNODE_Instruction,
-  FDE_XMLNODE_Element,
-  FDE_XMLNODE_Text,
-  FDE_XMLNODE_CharData,
-};
-
-struct FDE_XMLNODE {
-  int32_t iNodeNum;
-  FDE_XMLNODETYPE eNodeType;
-};
-
-bool FDE_IsXMLValidChar(wchar_t ch);
-
-#endif  // XFA_FDE_XML_FDE_XML_H_
diff --git a/xfa/fde/xml/fde_xml_imp.cpp b/xfa/fde/xml/fde_xml_imp.cpp
deleted file mode 100644
index 2de48ef..0000000
--- a/xfa/fde/xml/fde_xml_imp.cpp
+++ /dev/null
@@ -1,1832 +0,0 @@
-// Copyright 2014 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 "xfa/fde/xml/fde_xml_imp.h"
-
-#include <algorithm>
-#include <utility>
-
-#include "core/fxcrt/fx_ext.h"
-#include "core/fxcrt/fx_safe_types.h"
-#include "third_party/base/ptr_util.h"
-#include "third_party/base/stl_util.h"
-#include "xfa/fde/xml/cfde_xml_parser.h"
-#include "xfa/fgas/crt/fgas_codepage.h"
-
-namespace {
-
-const uint32_t kMaxCharRange = 0x10ffff;
-
-const uint16_t g_XMLValidCharRange[][2] = {{0x09, 0x09},
-                                           {0x0A, 0x0A},
-                                           {0x0D, 0x0D},
-                                           {0x20, 0xD7FF},
-                                           {0xE000, 0xFFFD}};
-
-bool FDE_IsXMLWhiteSpace(wchar_t ch) {
-  return ch == L' ' || ch == 0x0A || ch == 0x0D || ch == 0x09;
-}
-
-struct FDE_XMLNAMECHAR {
-  uint16_t wStart;
-  uint16_t wEnd;
-  bool bStartChar;
-};
-
-const FDE_XMLNAMECHAR g_XMLNameChars[] = {
-    {L'-', L'.', false},    {L'0', L'9', false},     {L':', L':', false},
-    {L'A', L'Z', true},     {L'_', L'_', true},      {L'a', L'z', true},
-    {0xB7, 0xB7, false},    {0xC0, 0xD6, true},      {0xD8, 0xF6, true},
-    {0xF8, 0x02FF, true},   {0x0300, 0x036F, false}, {0x0370, 0x037D, true},
-    {0x037F, 0x1FFF, true}, {0x200C, 0x200D, true},  {0x203F, 0x2040, false},
-    {0x2070, 0x218F, true}, {0x2C00, 0x2FEF, true},  {0x3001, 0xD7FF, true},
-    {0xF900, 0xFDCF, true}, {0xFDF0, 0xFFFD, true},
-};
-
-bool FDE_IsXMLNameChar(wchar_t ch, bool bFirstChar) {
-  int32_t iStart = 0;
-  int32_t iEnd = FX_ArraySize(g_XMLNameChars) - 1;
-  while (iStart <= iEnd) {
-    int32_t iMid = (iStart + iEnd) / 2;
-    if (ch < g_XMLNameChars[iMid].wStart) {
-      iEnd = iMid - 1;
-    } else if (ch > g_XMLNameChars[iMid].wEnd) {
-      iStart = iMid + 1;
-    } else {
-      return bFirstChar ? g_XMLNameChars[iMid].bStartChar : true;
-    }
-  }
-  return false;
-}
-
-}  // namespace
-
-bool FDE_IsXMLValidChar(wchar_t ch) {
-  int32_t iStart = 0;
-  int32_t iEnd = FX_ArraySize(g_XMLValidCharRange) - 1;
-  while (iStart <= iEnd) {
-    int32_t iMid = (iStart + iEnd) / 2;
-    if (ch < g_XMLValidCharRange[iMid][0]) {
-      iEnd = iMid - 1;
-    } else if (ch > g_XMLValidCharRange[iMid][1]) {
-      iStart = iMid + 1;
-    } else {
-      return true;
-    }
-  }
-  return false;
-}
-
-CFDE_XMLNode::CFDE_XMLNode()
-    : m_pParent(nullptr),
-      m_pChild(nullptr),
-      m_pPrior(nullptr),
-      m_pNext(nullptr) {}
-
-FDE_XMLNODETYPE CFDE_XMLNode::GetType() const {
-  return FDE_XMLNODE_Unknown;
-}
-
-CFDE_XMLNode::~CFDE_XMLNode() {
-  DeleteChildren();
-}
-
-void CFDE_XMLNode::DeleteChildren() {
-  CFDE_XMLNode* pChild = m_pChild;
-  while (pChild) {
-    CFDE_XMLNode* pNext = pChild->m_pNext;
-    delete pChild;
-    pChild = pNext;
-  }
-  m_pChild = nullptr;
-}
-
-int32_t CFDE_XMLNode::CountChildNodes() const {
-  int32_t iCount = 0;
-  CFDE_XMLNode* pChild = m_pChild;
-  while (pChild) {
-    iCount++;
-    pChild = pChild->m_pNext;
-  }
-  return iCount;
-}
-
-CFDE_XMLNode* CFDE_XMLNode::GetChildNode(int32_t index) const {
-  CFDE_XMLNode* pChild = m_pChild;
-  while (pChild) {
-    if (index == 0) {
-      return pChild;
-    }
-    index--;
-    pChild = pChild->m_pNext;
-  }
-  return nullptr;
-}
-
-int32_t CFDE_XMLNode::GetChildNodeIndex(CFDE_XMLNode* pNode) const {
-  int32_t index = 0;
-  CFDE_XMLNode* pChild = m_pChild;
-  while (pChild) {
-    if (pChild == pNode) {
-      return index;
-    }
-    index++;
-    pChild = pChild->m_pNext;
-  }
-  return -1;
-}
-
-CFDE_XMLNode* CFDE_XMLNode::GetPath(const wchar_t* pPath,
-                                    int32_t iLength,
-                                    bool bQualifiedName) const {
-  ASSERT(pPath);
-  if (iLength < 0) {
-    iLength = FXSYS_wcslen(pPath);
-  }
-  if (iLength == 0) {
-    return nullptr;
-  }
-  CFX_WideString csPath;
-  const wchar_t* pStart = pPath;
-  const wchar_t* pEnd = pPath + iLength;
-  wchar_t ch;
-  while (pStart < pEnd) {
-    ch = *pStart++;
-    if (ch == L'/') {
-      break;
-    } else {
-      csPath += ch;
-    }
-  }
-  iLength -= pStart - pPath;
-  CFDE_XMLNode* pFind = nullptr;
-  if (csPath.GetLength() < 1) {
-    pFind = GetNodeItem(CFDE_XMLNode::Root);
-  } else if (csPath.Compare(L"..") == 0) {
-    pFind = m_pParent;
-  } else if (csPath.Compare(L".") == 0) {
-    pFind = (CFDE_XMLNode*)this;
-  } else {
-    CFX_WideString wsTag;
-    CFDE_XMLNode* pNode = m_pChild;
-    while (pNode) {
-      if (pNode->GetType() == FDE_XMLNODE_Element) {
-        if (bQualifiedName) {
-          ((CFDE_XMLElement*)pNode)->GetTagName(wsTag);
-        } else {
-          ((CFDE_XMLElement*)pNode)->GetLocalTagName(wsTag);
-        }
-        if (wsTag.Compare(csPath) == 0) {
-          if (iLength < 1) {
-            pFind = pNode;
-          } else {
-            pFind = pNode->GetPath(pStart, iLength, bQualifiedName);
-          }
-          if (pFind)
-            return pFind;
-        }
-      }
-      pNode = pNode->m_pNext;
-    }
-  }
-  if (!pFind || iLength < 1)
-    return pFind;
-  return pFind->GetPath(pStart, iLength, bQualifiedName);
-}
-
-int32_t CFDE_XMLNode::InsertChildNode(CFDE_XMLNode* pNode, int32_t index) {
-  pNode->m_pParent = this;
-  if (!m_pChild) {
-    m_pChild = pNode;
-    pNode->m_pPrior = nullptr;
-    pNode->m_pNext = nullptr;
-    return 0;
-  }
-  if (index == 0) {
-    pNode->m_pNext = m_pChild;
-    pNode->m_pPrior = nullptr;
-    m_pChild->m_pPrior = pNode;
-    m_pChild = pNode;
-    return 0;
-  }
-  int32_t iCount = 0;
-  CFDE_XMLNode* pFind = m_pChild;
-  while (++iCount != index && pFind->m_pNext) {
-    pFind = pFind->m_pNext;
-  }
-  pNode->m_pPrior = pFind;
-  pNode->m_pNext = pFind->m_pNext;
-  if (pFind->m_pNext)
-    pFind->m_pNext->m_pPrior = pNode;
-  pFind->m_pNext = pNode;
-  return iCount;
-}
-
-void CFDE_XMLNode::RemoveChildNode(CFDE_XMLNode* pNode) {
-  ASSERT(m_pChild && pNode);
-  if (m_pChild == pNode) {
-    m_pChild = pNode->m_pNext;
-  } else {
-    pNode->m_pPrior->m_pNext = pNode->m_pNext;
-  }
-  if (pNode->m_pNext)
-    pNode->m_pNext->m_pPrior = pNode->m_pPrior;
-  pNode->m_pParent = nullptr;
-  pNode->m_pNext = nullptr;
-  pNode->m_pPrior = nullptr;
-}
-
-CFDE_XMLNode* CFDE_XMLNode::GetNodeItem(CFDE_XMLNode::NodeItem eItem) const {
-  switch (eItem) {
-    case CFDE_XMLNode::Root: {
-      CFDE_XMLNode* pParent = (CFDE_XMLNode*)this;
-      while (pParent->m_pParent) {
-        pParent = pParent->m_pParent;
-      }
-      return pParent;
-    }
-    case CFDE_XMLNode::Parent:
-      return m_pParent;
-    case CFDE_XMLNode::FirstSibling: {
-      CFDE_XMLNode* pItem = (CFDE_XMLNode*)this;
-      while (pItem->m_pPrior) {
-        pItem = pItem->m_pPrior;
-      }
-      return pItem == (CFDE_XMLNode*)this ? nullptr : pItem;
-    }
-    case CFDE_XMLNode::PriorSibling:
-      return m_pPrior;
-    case CFDE_XMLNode::NextSibling:
-      return m_pNext;
-    case CFDE_XMLNode::LastSibling: {
-      CFDE_XMLNode* pItem = (CFDE_XMLNode*)this;
-      while (pItem->m_pNext)
-        pItem = pItem->m_pNext;
-      return pItem == (CFDE_XMLNode*)this ? nullptr : pItem;
-    }
-    case CFDE_XMLNode::FirstNeighbor: {
-      CFDE_XMLNode* pParent = (CFDE_XMLNode*)this;
-      while (pParent->m_pParent)
-        pParent = pParent->m_pParent;
-      return pParent == (CFDE_XMLNode*)this ? nullptr : pParent;
-    }
-    case CFDE_XMLNode::PriorNeighbor: {
-      if (!m_pPrior)
-        return m_pParent;
-
-      CFDE_XMLNode* pItem = m_pPrior;
-      while (pItem->m_pChild) {
-        pItem = pItem->m_pChild;
-        while (pItem->m_pNext)
-          pItem = pItem->m_pNext;
-      }
-      return pItem;
-    }
-    case CFDE_XMLNode::NextNeighbor: {
-      if (m_pChild)
-        return m_pChild;
-      if (m_pNext)
-        return m_pNext;
-      CFDE_XMLNode* pItem = m_pParent;
-      while (pItem) {
-        if (pItem->m_pNext)
-          return pItem->m_pNext;
-        pItem = pItem->m_pParent;
-      }
-      return nullptr;
-    }
-    case CFDE_XMLNode::LastNeighbor: {
-      CFDE_XMLNode* pItem = (CFDE_XMLNode*)this;
-      while (pItem->m_pParent) {
-        pItem = pItem->m_pParent;
-      }
-      while (true) {
-        while (pItem->m_pNext)
-          pItem = pItem->m_pNext;
-        if (!pItem->m_pChild)
-          break;
-        pItem = pItem->m_pChild;
-      }
-      return pItem == (CFDE_XMLNode*)this ? nullptr : pItem;
-    }
-    case CFDE_XMLNode::FirstChild:
-      return m_pChild;
-    case CFDE_XMLNode::LastChild: {
-      if (!m_pChild)
-        return nullptr;
-
-      CFDE_XMLNode* pChild = m_pChild;
-      while (pChild->m_pNext)
-        pChild = pChild->m_pNext;
-      return pChild;
-    }
-    default:
-      break;
-  }
-  return nullptr;
-}
-
-int32_t CFDE_XMLNode::GetNodeLevel() const {
-  int32_t iLevel = 0;
-  const CFDE_XMLNode* pItem = m_pParent;
-  while (pItem) {
-    iLevel++;
-    pItem = pItem->m_pParent;
-  }
-  return iLevel;
-}
-
-bool CFDE_XMLNode::InsertNodeItem(CFDE_XMLNode::NodeItem eItem,
-                                  CFDE_XMLNode* pNode) {
-  switch (eItem) {
-    case CFDE_XMLNode::NextSibling: {
-      pNode->m_pParent = m_pParent;
-      pNode->m_pNext = m_pNext;
-      pNode->m_pPrior = this;
-      if (m_pNext) {
-        m_pNext->m_pPrior = pNode;
-      }
-      m_pNext = pNode;
-      return true;
-    }
-    case CFDE_XMLNode::PriorSibling: {
-      pNode->m_pParent = m_pParent;
-      pNode->m_pNext = this;
-      pNode->m_pPrior = m_pPrior;
-      if (m_pPrior) {
-        m_pPrior->m_pNext = pNode;
-      } else if (m_pParent) {
-        m_pParent->m_pChild = pNode;
-      }
-      m_pPrior = pNode;
-      return true;
-    }
-    default:
-      return false;
-  }
-}
-
-CFDE_XMLNode* CFDE_XMLNode::RemoveNodeItem(CFDE_XMLNode::NodeItem eItem) {
-  CFDE_XMLNode* pNode = nullptr;
-  switch (eItem) {
-    case CFDE_XMLNode::NextSibling:
-      if (m_pNext) {
-        pNode = m_pNext;
-        m_pNext = pNode->m_pNext;
-        if (m_pNext) {
-          m_pNext->m_pPrior = this;
-        }
-        pNode->m_pParent = nullptr;
-        pNode->m_pNext = nullptr;
-        pNode->m_pPrior = nullptr;
-      }
-      break;
-    default:
-      break;
-  }
-  return pNode;
-}
-
-CFDE_XMLNode* CFDE_XMLNode::Clone(bool bRecursive) {
-  return nullptr;
-}
-
-void CFDE_XMLNode::SaveXMLNode(const CFX_RetainPtr<IFGAS_Stream>& pXMLStream) {
-  CFDE_XMLNode* pNode = (CFDE_XMLNode*)this;
-  switch (pNode->GetType()) {
-    case FDE_XMLNODE_Instruction: {
-      CFX_WideString ws;
-      CFDE_XMLInstruction* pInstruction = (CFDE_XMLInstruction*)pNode;
-      if (pInstruction->m_wsTarget.CompareNoCase(L"xml") == 0) {
-        ws = L"<?xml version=\"1.0\" encoding=\"";
-        uint16_t wCodePage = pXMLStream->GetCodePage();
-        if (wCodePage == FX_CODEPAGE_UTF16LE) {
-          ws += L"UTF-16";
-        } else if (wCodePage == FX_CODEPAGE_UTF16BE) {
-          ws += L"UTF-16be";
-        } else {
-          ws += L"UTF-8";
-        }
-        ws += L"\"?>";
-        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-      } else {
-        ws.Format(L"<?%s", pInstruction->m_wsTarget.c_str());
-        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-        std::vector<CFX_WideString>& attributes = pInstruction->m_Attributes;
-        int32_t i;
-        int32_t iCount = pdfium::CollectionSize<int32_t>(attributes);
-        CFX_WideString wsValue;
-        for (i = 0; i < iCount; i += 2) {
-          ws = L" ";
-          ws += attributes[i];
-          ws += L"=\"";
-          wsValue = attributes[i + 1];
-          wsValue.Replace(L"&", L"&amp;");
-          wsValue.Replace(L"<", L"&lt;");
-          wsValue.Replace(L">", L"&gt;");
-          wsValue.Replace(L"\'", L"&apos;");
-          wsValue.Replace(L"\"", L"&quot;");
-          ws += wsValue;
-          ws += L"\"";
-          pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-        }
-        std::vector<CFX_WideString>& targetdata = pInstruction->m_TargetData;
-        iCount = pdfium::CollectionSize<int32_t>(targetdata);
-        for (i = 0; i < iCount; i++) {
-          ws = L" \"";
-          ws += targetdata[i];
-          ws += L"\"";
-          pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-        }
-        ws = L"?>";
-        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-      }
-    } break;
-    case FDE_XMLNODE_Element: {
-      CFX_WideString ws;
-      ws = L"<";
-      ws += ((CFDE_XMLElement*)pNode)->m_wsTag;
-      pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-      std::vector<CFX_WideString>& attributes =
-          static_cast<CFDE_XMLElement*>(pNode)->m_Attributes;
-      int32_t iCount = pdfium::CollectionSize<int32_t>(attributes);
-      CFX_WideString wsValue;
-      for (int32_t i = 0; i < iCount; i += 2) {
-        ws = L" ";
-        ws += attributes[i];
-        ws += L"=\"";
-        wsValue = attributes[i + 1];
-        wsValue.Replace(L"&", L"&amp;");
-        wsValue.Replace(L"<", L"&lt;");
-        wsValue.Replace(L">", L"&gt;");
-        wsValue.Replace(L"\'", L"&apos;");
-        wsValue.Replace(L"\"", L"&quot;");
-        ws += wsValue;
-        ws += L"\"";
-        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-      }
-      if (pNode->m_pChild) {
-        ws = L"\n>";
-        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-        CFDE_XMLNode* pChild = pNode->m_pChild;
-        while (pChild) {
-          pChild->SaveXMLNode(pXMLStream);
-          pChild = pChild->m_pNext;
-        }
-        ws = L"</";
-        ws += ((CFDE_XMLElement*)pNode)->m_wsTag;
-        ws += L"\n>";
-      } else {
-        ws = L"\n/>";
-      }
-      pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-    } break;
-    case FDE_XMLNODE_Text: {
-      CFX_WideString ws = ((CFDE_XMLText*)pNode)->m_wsText;
-      ws.Replace(L"&", L"&amp;");
-      ws.Replace(L"<", L"&lt;");
-      ws.Replace(L">", L"&gt;");
-      ws.Replace(L"\'", L"&apos;");
-      ws.Replace(L"\"", L"&quot;");
-      pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-    } break;
-    case FDE_XMLNODE_CharData: {
-      CFX_WideString ws = L"<![CDATA[";
-      ws += ((CFDE_XMLCharData*)pNode)->m_wsCharData;
-      ws += L"]]>";
-      pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-    } break;
-    case FDE_XMLNODE_Unknown:
-      break;
-    default:
-      break;
-  }
-}
-
-void CFDE_XMLNode::CloneChildren(CFDE_XMLNode* pClone) {
-  if (!m_pChild) {
-    return;
-  }
-  CFDE_XMLNode* pNext = m_pChild;
-  CFDE_XMLNode* pCloneNext = pNext->Clone(true);
-  pClone->InsertChildNode(pCloneNext);
-  pNext = pNext->m_pNext;
-  while (pNext) {
-    CFDE_XMLNode* pChild = pNext->Clone(true);
-    pCloneNext->InsertNodeItem(CFDE_XMLNode::NextSibling, pChild);
-    pCloneNext = pChild;
-    pNext = pNext->m_pNext;
-  }
-}
-
-CFDE_XMLInstruction::CFDE_XMLInstruction(const CFX_WideString& wsTarget)
-    : m_wsTarget(wsTarget) {
-  ASSERT(m_wsTarget.GetLength() > 0);
-}
-
-FDE_XMLNODETYPE CFDE_XMLInstruction::GetType() const {
-  return FDE_XMLNODE_Instruction;
-}
-
-CFDE_XMLNode* CFDE_XMLInstruction::Clone(bool bRecursive) {
-  CFDE_XMLInstruction* pClone = new CFDE_XMLInstruction(m_wsTarget);
-  if (!pClone)
-    return nullptr;
-
-  pClone->m_Attributes = m_Attributes;
-  pClone->m_TargetData = m_TargetData;
-  if (bRecursive)
-    CloneChildren(pClone);
-
-  return pClone;
-}
-
-int32_t CFDE_XMLInstruction::CountAttributes() const {
-  return pdfium::CollectionSize<int32_t>(m_Attributes) / 2;
-}
-
-bool CFDE_XMLInstruction::GetAttribute(int32_t index,
-                                       CFX_WideString& wsAttriName,
-                                       CFX_WideString& wsAttriValue) const {
-  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
-  ASSERT(index > -1 && index < iCount / 2);
-  for (int32_t i = 0; i < iCount; i += 2) {
-    if (index == 0) {
-      wsAttriName = m_Attributes[i];
-      wsAttriValue = m_Attributes[i + 1];
-      return true;
-    }
-    index--;
-  }
-  return false;
-}
-
-bool CFDE_XMLInstruction::HasAttribute(const wchar_t* pwsAttriName) const {
-  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
-  for (int32_t i = 0; i < iCount; i += 2) {
-    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
-      return true;
-    }
-  }
-  return false;
-}
-
-void CFDE_XMLInstruction::GetString(const wchar_t* pwsAttriName,
-                                    CFX_WideString& wsAttriValue,
-                                    const wchar_t* pwsDefValue) const {
-  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
-  for (int32_t i = 0; i < iCount; i += 2) {
-    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
-      wsAttriValue = m_Attributes[i + 1];
-      return;
-    }
-  }
-  wsAttriValue = pwsDefValue;
-}
-
-void CFDE_XMLInstruction::SetString(const CFX_WideString& wsAttriName,
-                                    const CFX_WideString& wsAttriValue) {
-  ASSERT(wsAttriName.GetLength() > 0);
-  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
-  for (int32_t i = 0; i < iCount; i += 2) {
-    if (m_Attributes[i].Compare(wsAttriName) == 0) {
-      m_Attributes[i] = wsAttriName;
-      m_Attributes[i + 1] = wsAttriValue;
-      return;
-    }
-  }
-  m_Attributes.push_back(wsAttriName);
-  m_Attributes.push_back(wsAttriValue);
-}
-
-int32_t CFDE_XMLInstruction::GetInteger(const wchar_t* pwsAttriName,
-                                        int32_t iDefValue) const {
-  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
-  for (int32_t i = 0; i < iCount; i += 2) {
-    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
-      return FXSYS_wtoi(m_Attributes[i + 1].c_str());
-    }
-  }
-  return iDefValue;
-}
-
-void CFDE_XMLInstruction::SetInteger(const wchar_t* pwsAttriName,
-                                     int32_t iAttriValue) {
-  CFX_WideString wsValue;
-  wsValue.Format(L"%d", iAttriValue);
-  SetString(pwsAttriName, wsValue);
-}
-
-float CFDE_XMLInstruction::GetFloat(const wchar_t* pwsAttriName,
-                                    float fDefValue) const {
-  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
-  for (int32_t i = 0; i < iCount; i += 2) {
-    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
-      return FXSYS_wcstof(m_Attributes[i + 1].c_str(), -1, nullptr);
-    }
-  }
-  return fDefValue;
-}
-
-void CFDE_XMLInstruction::SetFloat(const wchar_t* pwsAttriName,
-                                   float fAttriValue) {
-  CFX_WideString wsValue;
-  wsValue.Format(L"%f", fAttriValue);
-  SetString(pwsAttriName, wsValue);
-}
-
-void CFDE_XMLInstruction::RemoveAttribute(const wchar_t* pwsAttriName) {
-  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
-  for (int32_t i = 0; i < iCount; i += 2) {
-    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
-      m_Attributes.erase(m_Attributes.begin() + i,
-                         m_Attributes.begin() + i + 2);
-      return;
-    }
-  }
-}
-
-int32_t CFDE_XMLInstruction::CountData() const {
-  return pdfium::CollectionSize<int32_t>(m_TargetData);
-}
-
-bool CFDE_XMLInstruction::GetData(int32_t index, CFX_WideString& wsData) const {
-  if (!pdfium::IndexInBounds(m_TargetData, index))
-    return false;
-
-  wsData = m_TargetData[index];
-  return true;
-}
-
-void CFDE_XMLInstruction::AppendData(const CFX_WideString& wsData) {
-  m_TargetData.push_back(wsData);
-}
-
-void CFDE_XMLInstruction::RemoveData(int32_t index) {
-  if (pdfium::IndexInBounds(m_TargetData, index))
-    m_TargetData.erase(m_TargetData.begin() + index);
-}
-
-CFDE_XMLInstruction::~CFDE_XMLInstruction() {}
-
-CFDE_XMLElement::CFDE_XMLElement(const CFX_WideString& wsTag)
-    : CFDE_XMLNode(), m_wsTag(wsTag), m_Attributes() {
-  ASSERT(m_wsTag.GetLength() > 0);
-}
-
-CFDE_XMLElement::~CFDE_XMLElement() {}
-
-FDE_XMLNODETYPE CFDE_XMLElement::GetType() const {
-  return FDE_XMLNODE_Element;
-}
-
-CFDE_XMLNode* CFDE_XMLElement::Clone(bool bRecursive) {
-  CFDE_XMLElement* pClone = new CFDE_XMLElement(m_wsTag);
-  if (!pClone)
-    return nullptr;
-
-  pClone->m_Attributes = m_Attributes;
-  if (bRecursive) {
-    CloneChildren(pClone);
-  } else {
-    CFX_WideString wsText;
-    CFDE_XMLNode* pChild = m_pChild;
-    while (pChild) {
-      switch (pChild->GetType()) {
-        case FDE_XMLNODE_Text:
-          wsText += ((CFDE_XMLText*)pChild)->m_wsText;
-          break;
-        default:
-          break;
-      }
-      pChild = pChild->m_pNext;
-    }
-    pClone->SetTextData(wsText);
-  }
-  return pClone;
-}
-
-void CFDE_XMLElement::GetTagName(CFX_WideString& wsTag) const {
-  wsTag = m_wsTag;
-}
-
-void CFDE_XMLElement::GetLocalTagName(CFX_WideString& wsTag) const {
-  FX_STRSIZE iFind = m_wsTag.Find(L':', 0);
-  if (iFind < 0) {
-    wsTag = m_wsTag;
-  } else {
-    wsTag = m_wsTag.Right(m_wsTag.GetLength() - iFind - 1);
-  }
-}
-
-void CFDE_XMLElement::GetNamespacePrefix(CFX_WideString& wsPrefix) const {
-  FX_STRSIZE iFind = m_wsTag.Find(L':', 0);
-  if (iFind < 0) {
-    wsPrefix.clear();
-  } else {
-    wsPrefix = m_wsTag.Left(iFind);
-  }
-}
-
-void CFDE_XMLElement::GetNamespaceURI(CFX_WideString& wsNamespace) const {
-  CFX_WideString wsAttri(L"xmlns"), wsPrefix;
-  GetNamespacePrefix(wsPrefix);
-  if (wsPrefix.GetLength() > 0) {
-    wsAttri += L":";
-    wsAttri += wsPrefix;
-  }
-  wsNamespace.clear();
-  CFDE_XMLNode* pNode = (CFDE_XMLNode*)this;
-  while (pNode) {
-    if (pNode->GetType() != FDE_XMLNODE_Element) {
-      break;
-    }
-    CFDE_XMLElement* pElement = (CFDE_XMLElement*)pNode;
-    if (!pElement->HasAttribute(wsAttri.c_str())) {
-      pNode = pNode->GetNodeItem(CFDE_XMLNode::Parent);
-      continue;
-    }
-    pElement->GetString(wsAttri.c_str(), wsNamespace);
-    break;
-  }
-}
-
-int32_t CFDE_XMLElement::CountAttributes() const {
-  return pdfium::CollectionSize<int32_t>(m_Attributes) / 2;
-}
-
-bool CFDE_XMLElement::GetAttribute(int32_t index,
-                                   CFX_WideString& wsAttriName,
-                                   CFX_WideString& wsAttriValue) const {
-  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
-  ASSERT(index > -1 && index < iCount / 2);
-  for (int32_t i = 0; i < iCount; i += 2) {
-    if (index == 0) {
-      wsAttriName = m_Attributes[i];
-      wsAttriValue = m_Attributes[i + 1];
-      return true;
-    }
-    index--;
-  }
-  return false;
-}
-
-bool CFDE_XMLElement::HasAttribute(const wchar_t* pwsAttriName) const {
-  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
-  for (int32_t i = 0; i < iCount; i += 2) {
-    if (m_Attributes[i].Compare(pwsAttriName) == 0)
-      return true;
-  }
-  return false;
-}
-
-void CFDE_XMLElement::GetString(const wchar_t* pwsAttriName,
-                                CFX_WideString& wsAttriValue,
-                                const wchar_t* pwsDefValue) const {
-  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
-  for (int32_t i = 0; i < iCount; i += 2) {
-    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
-      wsAttriValue = m_Attributes[i + 1];
-      return;
-    }
-  }
-  wsAttriValue = pwsDefValue;
-}
-
-void CFDE_XMLElement::SetString(const CFX_WideString& wsAttriName,
-                                const CFX_WideString& wsAttriValue) {
-  ASSERT(wsAttriName.GetLength() > 0);
-  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
-  for (int32_t i = 0; i < iCount; i += 2) {
-    if (m_Attributes[i].Compare(wsAttriName) == 0) {
-      m_Attributes[i] = wsAttriName;
-      m_Attributes[i + 1] = wsAttriValue;
-      return;
-    }
-  }
-  m_Attributes.push_back(wsAttriName);
-  m_Attributes.push_back(wsAttriValue);
-}
-
-int32_t CFDE_XMLElement::GetInteger(const wchar_t* pwsAttriName,
-                                    int32_t iDefValue) const {
-  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
-  for (int32_t i = 0; i < iCount; i += 2) {
-    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
-      return FXSYS_wtoi(m_Attributes[i + 1].c_str());
-    }
-  }
-  return iDefValue;
-}
-
-void CFDE_XMLElement::SetInteger(const wchar_t* pwsAttriName,
-                                 int32_t iAttriValue) {
-  CFX_WideString wsValue;
-  wsValue.Format(L"%d", iAttriValue);
-  SetString(pwsAttriName, wsValue);
-}
-
-float CFDE_XMLElement::GetFloat(const wchar_t* pwsAttriName,
-                                float fDefValue) const {
-  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
-  for (int32_t i = 0; i < iCount; i += 2) {
-    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
-      return FXSYS_wcstof(m_Attributes[i + 1].c_str(), -1, nullptr);
-    }
-  }
-  return fDefValue;
-}
-
-void CFDE_XMLElement::SetFloat(const wchar_t* pwsAttriName, float fAttriValue) {
-  CFX_WideString wsValue;
-  wsValue.Format(L"%f", fAttriValue);
-  SetString(pwsAttriName, wsValue);
-}
-
-void CFDE_XMLElement::RemoveAttribute(const wchar_t* pwsAttriName) {
-  int32_t iCount = pdfium::CollectionSize<int32_t>(m_Attributes);
-  for (int32_t i = 0; i < iCount; i += 2) {
-    if (m_Attributes[i].Compare(pwsAttriName) == 0) {
-      m_Attributes.erase(m_Attributes.begin() + i,
-                         m_Attributes.begin() + i + 2);
-      return;
-    }
-  }
-}
-
-void CFDE_XMLElement::GetTextData(CFX_WideString& wsText) const {
-  CFX_WideTextBuf buffer;
-  CFDE_XMLNode* pChild = m_pChild;
-  while (pChild) {
-    switch (pChild->GetType()) {
-      case FDE_XMLNODE_Text:
-        buffer << ((CFDE_XMLText*)pChild)->m_wsText;
-        break;
-      case FDE_XMLNODE_CharData:
-        buffer << ((CFDE_XMLCharData*)pChild)->m_wsCharData;
-        break;
-      default:
-        break;
-    }
-    pChild = pChild->m_pNext;
-  }
-  wsText = buffer.AsStringC();
-}
-
-void CFDE_XMLElement::SetTextData(const CFX_WideString& wsText) {
-  if (wsText.GetLength() < 1) {
-    return;
-  }
-  InsertChildNode(new CFDE_XMLText(wsText));
-}
-
-CFDE_XMLText::CFDE_XMLText(const CFX_WideString& wsText)
-    : CFDE_XMLNode(), m_wsText(wsText) {}
-
-FDE_XMLNODETYPE CFDE_XMLText::GetType() const {
-  return FDE_XMLNODE_Text;
-}
-
-CFDE_XMLNode* CFDE_XMLText::Clone(bool bRecursive) {
-  CFDE_XMLText* pClone = new CFDE_XMLText(m_wsText);
-  return pClone;
-}
-
-CFDE_XMLText::~CFDE_XMLText() {}
-
-CFDE_XMLCharData::CFDE_XMLCharData(const CFX_WideString& wsCData)
-    : CFDE_XMLDeclaration(), m_wsCharData(wsCData) {}
-
-FDE_XMLNODETYPE CFDE_XMLCharData::GetType() const {
-  return FDE_XMLNODE_CharData;
-}
-
-CFDE_XMLNode* CFDE_XMLCharData::Clone(bool bRecursive) {
-  CFDE_XMLCharData* pClone = new CFDE_XMLCharData(m_wsCharData);
-  return pClone;
-}
-
-CFDE_XMLCharData::~CFDE_XMLCharData() {}
-
-CFDE_XMLDoc::CFDE_XMLDoc()
-    : m_iStatus(0), m_pRoot(pdfium::MakeUnique<CFDE_XMLNode>()) {
-  m_pRoot->InsertChildNode(new CFDE_XMLInstruction(L"xml"));
-}
-
-CFDE_XMLDoc::~CFDE_XMLDoc() {}
-
-bool CFDE_XMLDoc::LoadXML(std::unique_ptr<CFDE_XMLParser> pXMLParser) {
-  if (!pXMLParser)
-    return false;
-
-  m_iStatus = 0;
-  m_pStream.Reset();
-  m_pRoot->DeleteChildren();
-  m_pXMLParser = std::move(pXMLParser);
-  return true;
-}
-
-int32_t CFDE_XMLDoc::DoLoad(IFX_Pause* pPause) {
-  if (m_iStatus < 100)
-    m_iStatus = m_pXMLParser->DoParser(pPause);
-
-  return m_iStatus;
-}
-
-void CFDE_XMLDoc::CloseXML() {
-  m_pXMLParser.reset();
-}
-
-void CFDE_XMLDoc::SaveXMLNode(const CFX_RetainPtr<IFGAS_Stream>& pXMLStream,
-                              CFDE_XMLNode* pINode) {
-  CFDE_XMLNode* pNode = (CFDE_XMLNode*)pINode;
-  switch (pNode->GetType()) {
-    case FDE_XMLNODE_Instruction: {
-      CFX_WideString ws;
-      CFDE_XMLInstruction* pInstruction = (CFDE_XMLInstruction*)pNode;
-      if (pInstruction->m_wsTarget.CompareNoCase(L"xml") == 0) {
-        ws = L"<?xml version=\"1.0\" encoding=\"";
-        uint16_t wCodePage = pXMLStream->GetCodePage();
-        if (wCodePage == FX_CODEPAGE_UTF16LE) {
-          ws += L"UTF-16";
-        } else if (wCodePage == FX_CODEPAGE_UTF16BE) {
-          ws += L"UTF-16be";
-        } else {
-          ws += L"UTF-8";
-        }
-        ws += L"\"?>";
-        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-      } else {
-        ws.Format(L"<?%s", pInstruction->m_wsTarget.c_str());
-        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-        std::vector<CFX_WideString>& attributes = pInstruction->m_Attributes;
-        int32_t i;
-        int32_t iCount = pdfium::CollectionSize<int32_t>(attributes);
-        CFX_WideString wsValue;
-        for (i = 0; i < iCount; i += 2) {
-          ws = L" ";
-          ws += attributes[i];
-          ws += L"=\"";
-          wsValue = attributes[i + 1];
-          wsValue.Replace(L"&", L"&amp;");
-          wsValue.Replace(L"<", L"&lt;");
-          wsValue.Replace(L">", L"&gt;");
-          wsValue.Replace(L"\'", L"&apos;");
-          wsValue.Replace(L"\"", L"&quot;");
-          ws += wsValue;
-          ws += L"\"";
-          pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-        }
-        std::vector<CFX_WideString>& targetdata = pInstruction->m_TargetData;
-        iCount = pdfium::CollectionSize<int32_t>(targetdata);
-        for (i = 0; i < iCount; i++) {
-          ws = L" \"";
-          ws += targetdata[i];
-          ws += L"\"";
-          pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-        }
-        ws = L"?>";
-        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-      }
-    } break;
-    case FDE_XMLNODE_Element: {
-      CFX_WideString ws;
-      ws = L"<";
-      ws += ((CFDE_XMLElement*)pNode)->m_wsTag;
-      pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-      std::vector<CFX_WideString>& attributes =
-          static_cast<CFDE_XMLElement*>(pNode)->m_Attributes;
-      int32_t iCount = pdfium::CollectionSize<int32_t>(attributes);
-      CFX_WideString wsValue;
-      for (int32_t i = 0; i < iCount; i += 2) {
-        ws = L" ";
-        ws += attributes[i];
-        ws += L"=\"";
-        wsValue = attributes[i + 1];
-        wsValue.Replace(L"&", L"&amp;");
-        wsValue.Replace(L"<", L"&lt;");
-        wsValue.Replace(L">", L"&gt;");
-        wsValue.Replace(L"\'", L"&apos;");
-        wsValue.Replace(L"\"", L"&quot;");
-        ws += wsValue;
-        ws += L"\"";
-        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-      }
-      if (pNode->m_pChild) {
-        ws = L"\n>";
-        pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-        CFDE_XMLNode* pChild = pNode->m_pChild;
-        while (pChild) {
-          SaveXMLNode(pXMLStream, static_cast<CFDE_XMLNode*>(pChild));
-          pChild = pChild->m_pNext;
-        }
-        ws = L"</";
-        ws += ((CFDE_XMLElement*)pNode)->m_wsTag;
-        ws += L"\n>";
-      } else {
-        ws = L"\n/>";
-      }
-      pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-    } break;
-    case FDE_XMLNODE_Text: {
-      CFX_WideString ws = ((CFDE_XMLText*)pNode)->m_wsText;
-      ws.Replace(L"&", L"&amp;");
-      ws.Replace(L"<", L"&lt;");
-      ws.Replace(L">", L"&gt;");
-      ws.Replace(L"\'", L"&apos;");
-      ws.Replace(L"\"", L"&quot;");
-      pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-    } break;
-    case FDE_XMLNODE_CharData: {
-      CFX_WideString ws = L"<![CDATA[";
-      ws += ((CFDE_XMLCharData*)pNode)->m_wsCharData;
-      ws += L"]]>";
-      pXMLStream->WriteString(ws.c_str(), ws.GetLength());
-    } break;
-    case FDE_XMLNODE_Unknown:
-      break;
-    default:
-      break;
-  }
-}
-
-CFDE_BlockBuffer::CFDE_BlockBuffer(int32_t iAllocStep)
-    : m_iDataLength(0),
-      m_iBufferSize(0),
-      m_iAllocStep(iAllocStep),
-      m_iStartPosition(0) {}
-
-CFDE_BlockBuffer::~CFDE_BlockBuffer() {
-  ClearBuffer();
-}
-
-wchar_t* CFDE_BlockBuffer::GetAvailableBlock(int32_t& iIndexInBlock) {
-  iIndexInBlock = 0;
-  if (m_BlockArray.empty())
-    return nullptr;
-
-  int32_t iRealIndex = m_iStartPosition + m_iDataLength;
-  if (iRealIndex == m_iBufferSize) {
-    m_BlockArray.emplace_back(FX_Alloc(wchar_t, m_iAllocStep));
-    m_iBufferSize += m_iAllocStep;
-    return m_BlockArray.back().get();
-  }
-  iIndexInBlock = iRealIndex % m_iAllocStep;
-  return m_BlockArray[iRealIndex / m_iAllocStep].get();
-}
-
-bool CFDE_BlockBuffer::InitBuffer(int32_t iBufferSize) {
-  ClearBuffer();
-  int32_t iNumOfBlock = (iBufferSize - 1) / m_iAllocStep + 1;
-  for (int32_t i = 0; i < iNumOfBlock; i++)
-    m_BlockArray.emplace_back(FX_Alloc(wchar_t, m_iAllocStep));
-
-  m_iBufferSize = iNumOfBlock * m_iAllocStep;
-  return true;
-}
-
-void CFDE_BlockBuffer::SetTextChar(int32_t iIndex, wchar_t ch) {
-  if (iIndex < 0) {
-    return;
-  }
-  int32_t iRealIndex = m_iStartPosition + iIndex;
-  int32_t iBlockIndex = iRealIndex / m_iAllocStep;
-  int32_t iInnerIndex = iRealIndex % m_iAllocStep;
-  int32_t iBlockSize = pdfium::CollectionSize<int32_t>(m_BlockArray);
-  if (iBlockIndex >= iBlockSize) {
-    int32_t iNewBlocks = iBlockIndex - iBlockSize + 1;
-    do {
-      m_BlockArray.emplace_back(FX_Alloc(wchar_t, m_iAllocStep));
-      m_iBufferSize += m_iAllocStep;
-    } while (--iNewBlocks);
-  }
-  wchar_t* pTextData = m_BlockArray[iBlockIndex].get();
-  pTextData[iInnerIndex] = ch;
-  m_iDataLength = std::max(m_iDataLength, iIndex + 1);
-}
-
-int32_t CFDE_BlockBuffer::DeleteTextChars(int32_t iCount, bool bDirection) {
-  if (iCount <= 0)
-    return m_iDataLength;
-
-  if (iCount >= m_iDataLength) {
-    Reset(false);
-    return 0;
-  }
-  if (bDirection) {
-    m_iStartPosition += iCount;
-    m_iDataLength -= iCount;
-  } else {
-    m_iDataLength -= iCount;
-  }
-  return m_iDataLength;
-}
-
-void CFDE_BlockBuffer::GetTextData(CFX_WideString& wsTextData,
-                                   int32_t iStart,
-                                   int32_t iLength) const {
-  wsTextData.clear();
-  int32_t iMaybeDataLength = m_iBufferSize - 1 - m_iStartPosition;
-  if (iStart < 0 || iStart > iMaybeDataLength) {
-    return;
-  }
-  if (iLength == -1 || iLength > iMaybeDataLength) {
-    iLength = iMaybeDataLength;
-  }
-  if (iLength <= 0) {
-    return;
-  }
-  wchar_t* pBuf = wsTextData.GetBuffer(iLength);
-  if (!pBuf) {
-    return;
-  }
-  int32_t iStartBlockIndex = 0;
-  int32_t iStartInnerIndex = 0;
-  TextDataIndex2BufIndex(iStart, iStartBlockIndex, iStartInnerIndex);
-  int32_t iEndBlockIndex = 0;
-  int32_t iEndInnerIndex = 0;
-  TextDataIndex2BufIndex(iStart + iLength, iEndBlockIndex, iEndInnerIndex);
-  int32_t iPointer = 0;
-  for (int32_t i = iStartBlockIndex; i <= iEndBlockIndex; i++) {
-    int32_t iBufferPointer = 0;
-    int32_t iCopyLength = m_iAllocStep;
-    if (i == iStartBlockIndex) {
-      iCopyLength -= iStartInnerIndex;
-      iBufferPointer = iStartInnerIndex;
-    }
-    if (i == iEndBlockIndex) {
-      iCopyLength -= ((m_iAllocStep - 1) - iEndInnerIndex);
-    }
-    wchar_t* pBlockBuf = m_BlockArray[i].get();
-    memcpy(pBuf + iPointer, pBlockBuf + iBufferPointer,
-           iCopyLength * sizeof(wchar_t));
-    iPointer += iCopyLength;
-  }
-  wsTextData.ReleaseBuffer(iLength);
-}
-
-void CFDE_BlockBuffer::TextDataIndex2BufIndex(const int32_t iIndex,
-                                              int32_t& iBlockIndex,
-                                              int32_t& iInnerIndex) const {
-  ASSERT(iIndex >= 0);
-  int32_t iRealIndex = m_iStartPosition + iIndex;
-  iBlockIndex = iRealIndex / m_iAllocStep;
-  iInnerIndex = iRealIndex % m_iAllocStep;
-}
-
-void CFDE_BlockBuffer::ClearBuffer() {
-  m_iBufferSize = 0;
-  m_BlockArray.clear();
-}
-
-CFDE_XMLSyntaxParser::CFDE_XMLSyntaxParser()
-    : m_pStream(nullptr),
-      m_iXMLPlaneSize(-1),
-      m_iCurrentPos(0),
-      m_iCurrentNodeNum(-1),
-      m_iLastNodeNum(-1),
-      m_iParsedChars(0),
-      m_iParsedBytes(0),
-      m_pBuffer(nullptr),
-      m_iBufferChars(0),
-      m_bEOS(false),
-      m_pStart(nullptr),
-      m_pEnd(nullptr),
-      m_iAllocStep(m_BlockBuffer.GetAllocStep()),
-      m_iDataLength(m_BlockBuffer.GetDataLengthRef()),
-      m_pCurrentBlock(nullptr),
-      m_iIndexInBlock(0),
-      m_iTextDataLength(0),
-      m_syntaxParserResult(FDE_XmlSyntaxResult::None),
-      m_syntaxParserState(FDE_XmlSyntaxState::Text),
-      m_wQuotationMark(0),
-      m_iEntityStart(-1) {
-  m_CurNode.iNodeNum = -1;
-  m_CurNode.eNodeType = FDE_XMLNODE_Unknown;
-}
-
-void CFDE_XMLSyntaxParser::Init(const CFX_RetainPtr<IFGAS_Stream>& pStream,
-                                int32_t iXMLPlaneSize,
-                                int32_t iTextDataSize) {
-  ASSERT(!m_pStream && !m_pBuffer);
-  ASSERT(pStream && iXMLPlaneSize > 0);
-  int32_t iStreamLength = pStream->GetLength();
-  ASSERT(iStreamLength > 0);
-  m_pStream = pStream;
-  m_iXMLPlaneSize = std::min(iXMLPlaneSize, iStreamLength);
-  uint8_t bom[4];
-  m_iCurrentPos = m_pStream->GetBOM(bom);
-  ASSERT(!m_pBuffer);
-
-  FX_SAFE_INT32 alloc_size_safe = m_iXMLPlaneSize;
-  alloc_size_safe += 1;  // For NUL.
-  if (!alloc_size_safe.IsValid() || alloc_size_safe.ValueOrDie() <= 0) {
-    m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
-    return;
-  }
-
-  m_pBuffer = FX_Alloc(
-      wchar_t, pdfium::base::ValueOrDieForType<size_t>(alloc_size_safe));
-  m_pStart = m_pEnd = m_pBuffer;
-  ASSERT(!m_BlockBuffer.IsInitialized());
-  m_BlockBuffer.InitBuffer();
-  m_pCurrentBlock = m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-  m_iParsedBytes = m_iParsedChars = 0;
-  m_iBufferChars = 0;
-}
-
-FDE_XmlSyntaxResult CFDE_XMLSyntaxParser::DoSyntaxParse() {
-  if (m_syntaxParserResult == FDE_XmlSyntaxResult::Error ||
-      m_syntaxParserResult == FDE_XmlSyntaxResult::EndOfString) {
-    return m_syntaxParserResult;
-  }
-  ASSERT(m_pStream && m_pBuffer && m_BlockBuffer.IsInitialized());
-  int32_t iStreamLength = m_pStream->GetLength();
-  int32_t iPos;
-
-  FDE_XmlSyntaxResult syntaxParserResult = FDE_XmlSyntaxResult::None;
-  while (true) {
-    if (m_pStart >= m_pEnd) {
-      if (m_bEOS || m_iCurrentPos >= iStreamLength) {
-        m_syntaxParserResult = FDE_XmlSyntaxResult::EndOfString;
-        return m_syntaxParserResult;
-      }
-      m_iParsedChars += (m_pEnd - m_pBuffer);
-      m_iParsedBytes = m_iCurrentPos;
-      if (m_pStream->GetPosition() != m_iCurrentPos) {
-        m_pStream->Seek(FX_STREAMSEEK_Begin, m_iCurrentPos);
-      }
-      m_iBufferChars =
-          m_pStream->ReadString(m_pBuffer, m_iXMLPlaneSize, m_bEOS);
-      iPos = m_pStream->GetPosition();
-      if (m_iBufferChars < 1) {
-        m_iCurrentPos = iStreamLength;
-        m_syntaxParserResult = FDE_XmlSyntaxResult::EndOfString;
-        return m_syntaxParserResult;
-      }
-      m_iCurrentPos = iPos;
-      m_pStart = m_pBuffer;
-      m_pEnd = m_pBuffer + m_iBufferChars;
-    }
-
-    while (m_pStart < m_pEnd) {
-      wchar_t ch = *m_pStart;
-      switch (m_syntaxParserState) {
-        case FDE_XmlSyntaxState::Text:
-          if (ch == L'<') {
-            if (m_iDataLength > 0) {
-              m_iTextDataLength = m_iDataLength;
-              m_BlockBuffer.Reset();
-              m_pCurrentBlock =
-                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-              m_iEntityStart = -1;
-              syntaxParserResult = FDE_XmlSyntaxResult::Text;
-            } else {
-              m_pStart++;
-              m_syntaxParserState = FDE_XmlSyntaxState::Node;
-            }
-          } else {
-            ParseTextChar(ch);
-          }
-          break;
-        case FDE_XmlSyntaxState::Node:
-          if (ch == L'!') {
-            m_pStart++;
-            m_syntaxParserState = FDE_XmlSyntaxState::SkipCommentOrDecl;
-          } else if (ch == L'/') {
-            m_pStart++;
-            m_syntaxParserState = FDE_XmlSyntaxState::CloseElement;
-          } else if (ch == L'?') {
-            m_iLastNodeNum++;
-            m_iCurrentNodeNum = m_iLastNodeNum;
-            m_CurNode.iNodeNum = m_iLastNodeNum;
-            m_CurNode.eNodeType = FDE_XMLNODE_Instruction;
-            m_XMLNodeStack.push(m_CurNode);
-            m_pStart++;
-            m_syntaxParserState = FDE_XmlSyntaxState::Target;
-            syntaxParserResult = FDE_XmlSyntaxResult::InstructionOpen;
-          } else {
-            m_iLastNodeNum++;
-            m_iCurrentNodeNum = m_iLastNodeNum;
-            m_CurNode.iNodeNum = m_iLastNodeNum;
-            m_CurNode.eNodeType = FDE_XMLNODE_Element;
-            m_XMLNodeStack.push(m_CurNode);
-            m_syntaxParserState = FDE_XmlSyntaxState::Tag;
-            syntaxParserResult = FDE_XmlSyntaxResult::ElementOpen;
-          }
-          break;
-        case FDE_XmlSyntaxState::Target:
-        case FDE_XmlSyntaxState::Tag:
-          if (!FDE_IsXMLNameChar(ch, m_iDataLength < 1)) {
-            if (m_iDataLength < 1) {
-              m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
-              return m_syntaxParserResult;
-            } else {
-              m_iTextDataLength = m_iDataLength;
-              m_BlockBuffer.Reset();
-              m_pCurrentBlock =
-                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-              if (m_syntaxParserState != FDE_XmlSyntaxState::Target) {
-                syntaxParserResult = FDE_XmlSyntaxResult::TagName;
-              } else {
-                syntaxParserResult = FDE_XmlSyntaxResult::TargetName;
-              }
-              m_syntaxParserState = FDE_XmlSyntaxState::AttriName;
-            }
-          } else {
-            if (m_iIndexInBlock == m_iAllocStep) {
-              m_pCurrentBlock =
-                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-              if (!m_pCurrentBlock) {
-                return FDE_XmlSyntaxResult::Error;
-              }
-            }
-            m_pCurrentBlock[m_iIndexInBlock++] = ch;
-            m_iDataLength++;
-            m_pStart++;
-          }
-          break;
-        case FDE_XmlSyntaxState::AttriName:
-          if (m_iDataLength < 1 && FDE_IsXMLWhiteSpace(ch)) {
-            m_pStart++;
-            break;
-          }
-          if (!FDE_IsXMLNameChar(ch, m_iDataLength < 1)) {
-            if (m_iDataLength < 1) {
-              if (m_CurNode.eNodeType == FDE_XMLNODE_Element) {
-                if (ch == L'>' || ch == L'/') {
-                  m_syntaxParserState = FDE_XmlSyntaxState::BreakElement;
-                  break;
-                }
-              } else if (m_CurNode.eNodeType == FDE_XMLNODE_Instruction) {
-                if (ch == L'?') {
-                  m_syntaxParserState = FDE_XmlSyntaxState::CloseInstruction;
-                  m_pStart++;
-                } else {
-                  m_syntaxParserState = FDE_XmlSyntaxState::TargetData;
-                }
-                break;
-              }
-              m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
-              return m_syntaxParserResult;
-            } else {
-              if (m_CurNode.eNodeType == FDE_XMLNODE_Instruction) {
-                if (ch != '=' && !FDE_IsXMLWhiteSpace(ch)) {
-                  m_syntaxParserState = FDE_XmlSyntaxState::TargetData;
-                  break;
-                }
-              }
-              m_iTextDataLength = m_iDataLength;
-              m_BlockBuffer.Reset();
-              m_pCurrentBlock =
-                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-              m_syntaxParserState = FDE_XmlSyntaxState::AttriEqualSign;
-              syntaxParserResult = FDE_XmlSyntaxResult::AttriName;
-            }
-          } else {
-            if (m_iIndexInBlock == m_iAllocStep) {
-              m_pCurrentBlock =
-                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-              if (!m_pCurrentBlock) {
-                return FDE_XmlSyntaxResult::Error;
-              }
-            }
-            m_pCurrentBlock[m_iIndexInBlock++] = ch;
-            m_iDataLength++;
-            m_pStart++;
-          }
-          break;
-        case FDE_XmlSyntaxState::AttriEqualSign:
-          if (FDE_IsXMLWhiteSpace(ch)) {
-            m_pStart++;
-            break;
-          }
-          if (ch != L'=') {
-            if (m_CurNode.eNodeType == FDE_XMLNODE_Instruction) {
-              m_syntaxParserState = FDE_XmlSyntaxState::TargetData;
-              break;
-            }
-            m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
-            return m_syntaxParserResult;
-          } else {
-            m_syntaxParserState = FDE_XmlSyntaxState::AttriQuotation;
-            m_pStart++;
-          }
-          break;
-        case FDE_XmlSyntaxState::AttriQuotation:
-          if (FDE_IsXMLWhiteSpace(ch)) {
-            m_pStart++;
-            break;
-          }
-          if (ch != L'\"' && ch != L'\'') {
-            m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
-            return m_syntaxParserResult;
-          } else {
-            m_wQuotationMark = ch;
-            m_syntaxParserState = FDE_XmlSyntaxState::AttriValue;
-            m_pStart++;
-          }
-          break;
-        case FDE_XmlSyntaxState::AttriValue:
-          if (ch == m_wQuotationMark) {
-            if (m_iEntityStart > -1) {
-              m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
-              return m_syntaxParserResult;
-            }
-            m_iTextDataLength = m_iDataLength;
-            m_wQuotationMark = 0;
-            m_BlockBuffer.Reset();
-            m_pCurrentBlock = m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-            m_pStart++;
-            m_syntaxParserState = FDE_XmlSyntaxState::AttriName;
-            syntaxParserResult = FDE_XmlSyntaxResult::AttriValue;
-          } else {
-            ParseTextChar(ch);
-          }
-          break;
-        case FDE_XmlSyntaxState::CloseInstruction:
-          if (ch != L'>') {
-            if (m_iIndexInBlock == m_iAllocStep) {
-              m_pCurrentBlock =
-                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-              if (!m_pCurrentBlock) {
-                return FDE_XmlSyntaxResult::Error;
-              }
-            }
-            m_pCurrentBlock[m_iIndexInBlock++] = ch;
-            m_iDataLength++;
-            m_syntaxParserState = FDE_XmlSyntaxState::TargetData;
-          } else if (m_iDataLength > 0) {
-            m_iTextDataLength = m_iDataLength;
-            m_BlockBuffer.Reset();
-            m_pCurrentBlock = m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-            syntaxParserResult = FDE_XmlSyntaxResult::TargetData;
-          } else {
-            m_pStart++;
-            if (m_XMLNodeStack.empty()) {
-              m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
-              return m_syntaxParserResult;
-            }
-            m_XMLNodeStack.pop();
-            if (!m_XMLNodeStack.empty()) {
-              m_CurNode = m_XMLNodeStack.top();
-            } else {
-              m_CurNode.iNodeNum = -1;
-              m_CurNode.eNodeType = FDE_XMLNODE_Unknown;
-            }
-            m_iCurrentNodeNum = m_CurNode.iNodeNum;
-            m_BlockBuffer.Reset();
-            m_pCurrentBlock = m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-            m_syntaxParserState = FDE_XmlSyntaxState::Text;
-            syntaxParserResult = FDE_XmlSyntaxResult::InstructionClose;
-          }
-          break;
-        case FDE_XmlSyntaxState::BreakElement:
-          if (ch == L'>') {
-            m_syntaxParserState = FDE_XmlSyntaxState::Text;
-            syntaxParserResult = FDE_XmlSyntaxResult::ElementBreak;
-          } else if (ch == L'/') {
-            m_syntaxParserState = FDE_XmlSyntaxState::CloseElement;
-          } else {
-            m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
-            return m_syntaxParserResult;
-          }
-          m_pStart++;
-          break;
-        case FDE_XmlSyntaxState::CloseElement:
-          if (!FDE_IsXMLNameChar(ch, m_iDataLength < 1)) {
-            if (ch == L'>') {
-              if (m_XMLNodeStack.empty()) {
-                m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
-                return m_syntaxParserResult;
-              }
-              m_XMLNodeStack.pop();
-              if (!m_XMLNodeStack.empty()) {
-                m_CurNode = m_XMLNodeStack.top();
-              } else {
-                m_CurNode.iNodeNum = -1;
-                m_CurNode.eNodeType = FDE_XMLNODE_Unknown;
-              }
-              m_iCurrentNodeNum = m_CurNode.iNodeNum;
-              m_iTextDataLength = m_iDataLength;
-              m_BlockBuffer.Reset();
-              m_pCurrentBlock =
-                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-              m_syntaxParserState = FDE_XmlSyntaxState::Text;
-              syntaxParserResult = FDE_XmlSyntaxResult::ElementClose;
-            } else if (!FDE_IsXMLWhiteSpace(ch)) {
-              m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
-              return m_syntaxParserResult;
-            }
-          } else {
-            if (m_iIndexInBlock == m_iAllocStep) {
-              m_pCurrentBlock =
-                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-              if (!m_pCurrentBlock) {
-                return FDE_XmlSyntaxResult::Error;
-              }
-            }
-            m_pCurrentBlock[m_iIndexInBlock++] = ch;
-            m_iDataLength++;
-          }
-          m_pStart++;
-          break;
-        case FDE_XmlSyntaxState::SkipCommentOrDecl:
-          if (FXSYS_wcsnicmp(m_pStart, L"--", 2) == 0) {
-            m_pStart += 2;
-            m_syntaxParserState = FDE_XmlSyntaxState::SkipComment;
-          } else if (FXSYS_wcsnicmp(m_pStart, L"[CDATA[", 7) == 0) {
-            m_pStart += 7;
-            m_syntaxParserState = FDE_XmlSyntaxState::SkipCData;
-          } else {
-            m_syntaxParserState = FDE_XmlSyntaxState::SkipDeclNode;
-            m_SkipChar = L'>';
-            m_SkipStack.push(L'>');
-          }
-          break;
-        case FDE_XmlSyntaxState::SkipCData: {
-          if (FXSYS_wcsnicmp(m_pStart, L"]]>", 3) == 0) {
-            m_pStart += 3;
-            syntaxParserResult = FDE_XmlSyntaxResult::CData;
-            m_iTextDataLength = m_iDataLength;
-            m_BlockBuffer.Reset();
-            m_pCurrentBlock = m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-            m_syntaxParserState = FDE_XmlSyntaxState::Text;
-          } else {
-            if (m_iIndexInBlock == m_iAllocStep) {
-              m_pCurrentBlock =
-                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-              if (!m_pCurrentBlock)
-                return FDE_XmlSyntaxResult::Error;
-            }
-            m_pCurrentBlock[m_iIndexInBlock++] = ch;
-            m_iDataLength++;
-            m_pStart++;
-          }
-          break;
-        }
-        case FDE_XmlSyntaxState::SkipDeclNode:
-          if (m_SkipChar == L'\'' || m_SkipChar == L'\"') {
-            m_pStart++;
-            if (ch != m_SkipChar)
-              break;
-
-            m_SkipStack.pop();
-            if (m_SkipStack.empty())
-              m_syntaxParserState = FDE_XmlSyntaxState::Text;
-            else
-              m_SkipChar = m_SkipStack.top();
-          } else {
-            switch (ch) {
-              case L'<':
-                m_SkipChar = L'>';
-                m_SkipStack.push(L'>');
-                break;
-              case L'[':
-                m_SkipChar = L']';
-                m_SkipStack.push(L']');
-                break;
-              case L'(':
-                m_SkipChar = L')';
-                m_SkipStack.push(L')');
-                break;
-              case L'\'':
-                m_SkipChar = L'\'';
-                m_SkipStack.push(L'\'');
-                break;
-              case L'\"':
-                m_SkipChar = L'\"';
-                m_SkipStack.push(L'\"');
-                break;
-              default:
-                if (ch == m_SkipChar) {
-                  m_SkipStack.pop();
-                  if (m_SkipStack.empty()) {
-                    if (m_iDataLength >= 9) {
-                      CFX_WideString wsHeader;
-                      m_BlockBuffer.GetTextData(wsHeader, 0, 7);
-                    }
-                    m_iTextDataLength = m_iDataLength;
-                    m_BlockBuffer.Reset();
-                    m_pCurrentBlock =
-                        m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-                    m_syntaxParserState = FDE_XmlSyntaxState::Text;
-                  } else {
-                    m_SkipChar = m_SkipStack.top();
-                  }
-                }
-                break;
-            }
-            if (!m_SkipStack.empty()) {
-              if (m_iIndexInBlock == m_iAllocStep) {
-                m_pCurrentBlock =
-                    m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-                if (!m_pCurrentBlock) {
-                  return FDE_XmlSyntaxResult::Error;
-                }
-              }
-              m_pCurrentBlock[m_iIndexInBlock++] = ch;
-              m_iDataLength++;
-            }
-            m_pStart++;
-          }
-          break;
-        case FDE_XmlSyntaxState::SkipComment:
-          if (FXSYS_wcsnicmp(m_pStart, L"-->", 3) == 0) {
-            m_pStart += 2;
-            m_syntaxParserState = FDE_XmlSyntaxState::Text;
-          }
-
-          m_pStart++;
-          break;
-        case FDE_XmlSyntaxState::TargetData:
-          if (FDE_IsXMLWhiteSpace(ch)) {
-            if (m_iDataLength < 1) {
-              m_pStart++;
-              break;
-            } else if (m_wQuotationMark == 0) {
-              m_iTextDataLength = m_iDataLength;
-              m_wQuotationMark = 0;
-              m_BlockBuffer.Reset();
-              m_pCurrentBlock =
-                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-              m_pStart++;
-              syntaxParserResult = FDE_XmlSyntaxResult::TargetData;
-              break;
-            }
-          }
-          if (ch == '?') {
-            m_syntaxParserState = FDE_XmlSyntaxState::CloseInstruction;
-            m_pStart++;
-          } else if (ch == '\"') {
-            if (m_wQuotationMark == 0) {
-              m_wQuotationMark = ch;
-              m_pStart++;
-            } else if (ch == m_wQuotationMark) {
-              m_iTextDataLength = m_iDataLength;
-              m_wQuotationMark = 0;
-              m_BlockBuffer.Reset();
-              m_pCurrentBlock =
-                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-              m_pStart++;
-              syntaxParserResult = FDE_XmlSyntaxResult::TargetData;
-            } else {
-              m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
-              return m_syntaxParserResult;
-            }
-          } else {
-            if (m_iIndexInBlock == m_iAllocStep) {
-              m_pCurrentBlock =
-                  m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-              if (!m_pCurrentBlock) {
-                return FDE_XmlSyntaxResult::Error;
-              }
-            }
-            m_pCurrentBlock[m_iIndexInBlock++] = ch;
-            m_iDataLength++;
-            m_pStart++;
-          }
-          break;
-        default:
-          break;
-      }
-      if (syntaxParserResult != FDE_XmlSyntaxResult::None)
-        return syntaxParserResult;
-    }
-  }
-  return FDE_XmlSyntaxResult::Text;
-}
-
-CFDE_XMLSyntaxParser::~CFDE_XMLSyntaxParser() {
-  m_pCurrentBlock = nullptr;
-  FX_Free(m_pBuffer);
-}
-
-int32_t CFDE_XMLSyntaxParser::GetStatus() const {
-  if (!m_pStream)
-    return -1;
-
-  int32_t iStreamLength = m_pStream->GetLength();
-  if (iStreamLength < 1)
-    return 100;
-
-  if (m_syntaxParserResult == FDE_XmlSyntaxResult::Error)
-    return -1;
-
-  if (m_syntaxParserResult == FDE_XmlSyntaxResult::EndOfString)
-    return 100;
-  return m_iParsedBytes * 100 / iStreamLength;
-}
-
-static int32_t FX_GetUTF8EncodeLength(const wchar_t* pSrc, int32_t iSrcLen) {
-  uint32_t unicode = 0;
-  int32_t iDstNum = 0;
-  while (iSrcLen-- > 0) {
-    unicode = *pSrc++;
-    int nbytes = 0;
-    if ((uint32_t)unicode < 0x80) {
-      nbytes = 1;
-    } else if ((uint32_t)unicode < 0x800) {
-      nbytes = 2;
-    } else if ((uint32_t)unicode < 0x10000) {
-      nbytes = 3;
-    } else if ((uint32_t)unicode < 0x200000) {
-      nbytes = 4;
-    } else if ((uint32_t)unicode < 0x4000000) {
-      nbytes = 5;
-    } else {
-      nbytes = 6;
-    }
-    iDstNum += nbytes;
-  }
-  return iDstNum;
-}
-
-FX_FILESIZE CFDE_XMLSyntaxParser::GetCurrentBinaryPos() const {
-  if (!m_pStream)
-    return 0;
-
-  int32_t nSrcLen = m_pStart - m_pBuffer;
-  int32_t nDstLen = FX_GetUTF8EncodeLength(m_pBuffer, nSrcLen);
-  return m_iParsedBytes + nDstLen;
-}
-
-void CFDE_XMLSyntaxParser::ParseTextChar(wchar_t character) {
-  if (m_iIndexInBlock == m_iAllocStep) {
-    m_pCurrentBlock = m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-    if (!m_pCurrentBlock) {
-      return;
-    }
-  }
-  m_pCurrentBlock[m_iIndexInBlock++] = character;
-  m_iDataLength++;
-  if (m_iEntityStart > -1 && character == L';') {
-    CFX_WideString csEntity;
-    m_BlockBuffer.GetTextData(csEntity, m_iEntityStart + 1,
-                              (m_iDataLength - 1) - m_iEntityStart - 1);
-    int32_t iLen = csEntity.GetLength();
-    if (iLen > 0) {
-      if (csEntity[0] == L'#') {
-        uint32_t ch = 0;
-        wchar_t w;
-        if (iLen > 1 && csEntity[1] == L'x') {
-          for (int32_t i = 2; i < iLen; i++) {
-            w = csEntity[i];
-            if (w >= L'0' && w <= L'9') {
-              ch = (ch << 4) + w - L'0';
-            } else if (w >= L'A' && w <= L'F') {
-              ch = (ch << 4) + w - 55;
-            } else if (w >= L'a' && w <= L'f') {
-              ch = (ch << 4) + w - 87;
-            } else {
-              break;
-            }
-          }
-        } else {
-          for (int32_t i = 1; i < iLen; i++) {
-            w = csEntity[i];
-            if (w < L'0' || w > L'9')
-              break;
-            ch = ch * 10 + w - L'0';
-          }
-        }
-        if (ch > kMaxCharRange)
-          ch = ' ';
-
-        character = static_cast<wchar_t>(ch);
-        if (character != 0) {
-          m_BlockBuffer.SetTextChar(m_iEntityStart, character);
-          m_iEntityStart++;
-        }
-      } else {
-        if (csEntity.Compare(L"amp") == 0) {
-          m_BlockBuffer.SetTextChar(m_iEntityStart, L'&');
-          m_iEntityStart++;
-        } else if (csEntity.Compare(L"lt") == 0) {
-          m_BlockBuffer.SetTextChar(m_iEntityStart, L'<');
-          m_iEntityStart++;
-        } else if (csEntity.Compare(L"gt") == 0) {
-          m_BlockBuffer.SetTextChar(m_iEntityStart, L'>');
-          m_iEntityStart++;
-        } else if (csEntity.Compare(L"apos") == 0) {
-          m_BlockBuffer.SetTextChar(m_iEntityStart, L'\'');
-          m_iEntityStart++;
-        } else if (csEntity.Compare(L"quot") == 0) {
-          m_BlockBuffer.SetTextChar(m_iEntityStart, L'\"');
-          m_iEntityStart++;
-        }
-      }
-    }
-    m_BlockBuffer.DeleteTextChars(m_iDataLength - m_iEntityStart, false);
-    m_pCurrentBlock = m_BlockBuffer.GetAvailableBlock(m_iIndexInBlock);
-    m_iEntityStart = -1;
-  } else {
-    if (m_iEntityStart < 0 && character == L'&') {
-      m_iEntityStart = m_iDataLength - 1;
-    }
-  }
-  m_pStart++;
-}
diff --git a/xfa/fde/xml/fde_xml_imp.h b/xfa/fde/xml/fde_xml_imp.h
deleted file mode 100644
index bd88da0..0000000
--- a/xfa/fde/xml/fde_xml_imp.h
+++ /dev/null
@@ -1,335 +0,0 @@
-// Copyright 2014 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
-
-#ifndef XFA_FDE_XML_FDE_XML_IMP_H_
-#define XFA_FDE_XML_FDE_XML_IMP_H_
-
-#include <memory>
-#include <stack>
-#include <vector>
-
-#include "core/fxcrt/fx_basic.h"
-#include "core/fxcrt/fx_system.h"
-#include "xfa/fde/xml/fde_xml.h"
-#include "xfa/fgas/crt/ifgas_stream.h"
-
-class CFDE_BlockBuffer;
-class CFDE_XMLInstruction;
-class CFDE_XMLElement;
-class CFDE_XMLText;
-class CFDE_XMLDoc;
-class CFDE_XMLDOMParser;
-class CFDE_XMLParser;
-class CFDE_XMLSyntaxParser;
-
-class CFDE_XMLNode {
- public:
-  enum NodeItem {
-    Root = 0,
-    Parent,
-    FirstSibling,
-    PriorSibling,
-    NextSibling,
-    LastSibling,
-    FirstNeighbor,
-    PriorNeighbor,
-    NextNeighbor,
-    LastNeighbor,
-    FirstChild,
-    LastChild
-  };
-
-  CFDE_XMLNode();
-  virtual ~CFDE_XMLNode();
-
-  virtual FDE_XMLNODETYPE GetType() const;
-  virtual CFDE_XMLNode* Clone(bool bRecursive);
-
-  int32_t CountChildNodes() const;
-  CFDE_XMLNode* GetChildNode(int32_t index) const;
-  int32_t GetChildNodeIndex(CFDE_XMLNode* pNode) const;
-  int32_t InsertChildNode(CFDE_XMLNode* pNode, int32_t index = -1);
-  void RemoveChildNode(CFDE_XMLNode* pNode);
-  void DeleteChildren();
-  void CloneChildren(CFDE_XMLNode* pClone);
-
-  CFDE_XMLNode* GetPath(const wchar_t* pPath,
-                        int32_t iLength = -1,
-                        bool bQualifiedName = true) const;
-
-  int32_t GetNodeLevel() const;
-  CFDE_XMLNode* GetNodeItem(CFDE_XMLNode::NodeItem eItem) const;
-  bool InsertNodeItem(CFDE_XMLNode::NodeItem eItem, CFDE_XMLNode* pNode);
-  CFDE_XMLNode* RemoveNodeItem(CFDE_XMLNode::NodeItem eItem);
-
-  void SaveXMLNode(const CFX_RetainPtr<IFGAS_Stream>& pXMLStream);
-
-  CFDE_XMLNode* m_pParent;
-  CFDE_XMLNode* m_pChild;
-  CFDE_XMLNode* m_pPrior;
-  CFDE_XMLNode* m_pNext;
-};
-
-class CFDE_XMLInstruction : public CFDE_XMLNode {
- public:
-  explicit CFDE_XMLInstruction(const CFX_WideString& wsTarget);
-  ~CFDE_XMLInstruction() override;
-
-  // CFDE_XMLNode
-  FDE_XMLNODETYPE GetType() const override;
-  CFDE_XMLNode* Clone(bool bRecursive) override;
-
-  void GetTargetName(CFX_WideString& wsTarget) const { wsTarget = m_wsTarget; }
-  int32_t CountAttributes() const;
-  bool GetAttribute(int32_t index,
-                    CFX_WideString& wsAttriName,
-                    CFX_WideString& wsAttriValue) const;
-  bool HasAttribute(const wchar_t* pwsAttriName) const;
-  void GetString(const wchar_t* pwsAttriName,
-                 CFX_WideString& wsAttriValue,
-                 const wchar_t* pwsDefValue = nullptr) const;
-  void SetString(const CFX_WideString& wsAttriName,
-                 const CFX_WideString& wsAttriValue);
-  int32_t GetInteger(const wchar_t* pwsAttriName, int32_t iDefValue = 0) const;
-  void SetInteger(const wchar_t* pwsAttriName, int32_t iAttriValue);
-  float GetFloat(const wchar_t* pwsAttriName, float fDefValue = 0) const;
-  void SetFloat(const wchar_t* pwsAttriName, float fAttriValue);
-  void RemoveAttribute(const wchar_t* pwsAttriName);
-  int32_t CountData() const;
-  bool GetData(int32_t index, CFX_WideString& wsData) const;
-  void AppendData(const CFX_WideString& wsData);
-  void RemoveData(int32_t index);
-
-  CFX_WideString m_wsTarget;
-  std::vector<CFX_WideString> m_Attributes;
-  std::vector<CFX_WideString> m_TargetData;
-};
-
-class CFDE_XMLElement : public CFDE_XMLNode {
- public:
-  explicit CFDE_XMLElement(const CFX_WideString& wsTag);
-  ~CFDE_XMLElement() override;
-
-  // CFDE_XMLNode
-  FDE_XMLNODETYPE GetType() const override;
-  CFDE_XMLNode* Clone(bool bRecursive) override;
-
-  void GetTagName(CFX_WideString& wsTag) const;
-  void GetLocalTagName(CFX_WideString& wsTag) const;
-
-  void GetNamespacePrefix(CFX_WideString& wsPrefix) const;
-  void GetNamespaceURI(CFX_WideString& wsNamespace) const;
-
-  int32_t CountAttributes() const;
-  bool GetAttribute(int32_t index,
-                    CFX_WideString& wsAttriName,
-                    CFX_WideString& wsAttriValue) const;
-  bool HasAttribute(const wchar_t* pwsAttriName) const;
-  void RemoveAttribute(const wchar_t* pwsAttriName);
-
-  void GetString(const wchar_t* pwsAttriName,
-                 CFX_WideString& wsAttriValue,
-                 const wchar_t* pwsDefValue = nullptr) const;
-  void SetString(const CFX_WideString& wsAttriName,
-                 const CFX_WideString& wsAttriValue);
-
-  int32_t GetInteger(const wchar_t* pwsAttriName, int32_t iDefValue = 0) const;
-  void SetInteger(const wchar_t* pwsAttriName, int32_t iAttriValue);
-
-  float GetFloat(const wchar_t* pwsAttriName, float fDefValue = 0) const;
-  void SetFloat(const wchar_t* pwsAttriName, float fAttriValue);
-
-  void GetTextData(CFX_WideString& wsText) const;
-  void SetTextData(const CFX_WideString& wsText);
-
-  CFX_WideString m_wsTag;
-  std::vector<CFX_WideString> m_Attributes;
-};
-
-class CFDE_XMLText : public CFDE_XMLNode {
- public:
-  explicit CFDE_XMLText(const CFX_WideString& wsText);
-  ~CFDE_XMLText() override;
-
-  // CFDE_XMLNode
-  FDE_XMLNODETYPE GetType() const override;
-  CFDE_XMLNode* Clone(bool bRecursive) override;
-
-  void GetText(CFX_WideString& wsText) const { wsText = m_wsText; }
-  void SetText(const CFX_WideString& wsText) { m_wsText = wsText; }
-
-  CFX_WideString m_wsText;
-};
-
-class CFDE_XMLDeclaration : public CFDE_XMLNode {
- public:
-  CFDE_XMLDeclaration() {}
-  ~CFDE_XMLDeclaration() override {}
-};
-
-class CFDE_XMLCharData : public CFDE_XMLDeclaration {
- public:
-  explicit CFDE_XMLCharData(const CFX_WideString& wsCData);
-  ~CFDE_XMLCharData() override;
-
-  FDE_XMLNODETYPE GetType() const override;
-  CFDE_XMLNode* Clone(bool bRecursive) override;
-
-  void GetCharData(CFX_WideString& wsCharData) const {
-    wsCharData = m_wsCharData;
-  }
-  void SetCharData(const CFX_WideString& wsCData) { m_wsCharData = wsCData; }
-
-  CFX_WideString m_wsCharData;
-};
-
-class CFDE_XMLDoc {
- public:
-  CFDE_XMLDoc();
-  ~CFDE_XMLDoc();
-
-  bool LoadXML(std::unique_ptr<CFDE_XMLParser> pXMLParser);
-  int32_t DoLoad(IFX_Pause* pPause = nullptr);
-  void CloseXML();
-  CFDE_XMLNode* GetRoot() const { return m_pRoot.get(); }
-  void SaveXMLNode(const CFX_RetainPtr<IFGAS_Stream>& pXMLStream,
-                   CFDE_XMLNode* pNode);
-
- private:
-  int32_t m_iStatus;
-  std::unique_ptr<CFDE_XMLNode> m_pRoot;
-  std::unique_ptr<CFDE_XMLParser> m_pXMLParser;
-  CFX_RetainPtr<IFGAS_Stream> m_pStream;
-};
-
-class CFDE_BlockBuffer {
- public:
-  explicit CFDE_BlockBuffer(int32_t iAllocStep = 1024 * 1024);
-  ~CFDE_BlockBuffer();
-
-  bool InitBuffer(int32_t iBufferSize = 1024 * 1024);
-  bool IsInitialized() { return m_iBufferSize / m_iAllocStep >= 1; }
-  wchar_t* GetAvailableBlock(int32_t& iIndexInBlock);
-  inline int32_t GetAllocStep() const { return m_iAllocStep; }
-  inline int32_t& GetDataLengthRef() { return m_iDataLength; }
-  inline void Reset(bool bReserveData = true) {
-    if (!bReserveData) {
-      m_iStartPosition = 0;
-    }
-    m_iDataLength = 0;
-  }
-  void SetTextChar(int32_t iIndex, wchar_t ch);
-  int32_t DeleteTextChars(int32_t iCount, bool bDirection = true);
-  void GetTextData(CFX_WideString& wsTextData,
-                   int32_t iStart = 0,
-                   int32_t iLength = -1) const;
-
- protected:
-  inline void TextDataIndex2BufIndex(const int32_t iIndex,
-                                     int32_t& iBlockIndex,
-                                     int32_t& iInnerIndex) const;
-  void ClearBuffer();
-
-  std::vector<std::unique_ptr<wchar_t, FxFreeDeleter>> m_BlockArray;
-  int32_t m_iDataLength;
-  int32_t m_iBufferSize;
-  int32_t m_iAllocStep;
-  int32_t m_iStartPosition;
-};
-
-class CFDE_XMLSyntaxParser {
- public:
-  CFDE_XMLSyntaxParser();
-  ~CFDE_XMLSyntaxParser();
-
-  void Init(const CFX_RetainPtr<IFGAS_Stream>& pStream,
-            int32_t iXMLPlaneSize,
-            int32_t iTextDataSize = 256);
-
-  FDE_XmlSyntaxResult DoSyntaxParse();
-
-  int32_t GetStatus() const;
-  int32_t GetCurrentPos() const {
-    return m_iParsedChars + (m_pStart - m_pBuffer);
-  }
-  FX_FILESIZE GetCurrentBinaryPos() const;
-  int32_t GetCurrentNodeNumber() const { return m_iCurrentNodeNum; }
-  int32_t GetLastNodeNumber() const { return m_iLastNodeNum; }
-
-  void GetTargetName(CFX_WideString& wsTarget) const {
-    m_BlockBuffer.GetTextData(wsTarget, 0, m_iTextDataLength);
-  }
-  void GetTagName(CFX_WideString& wsTag) const {
-    m_BlockBuffer.GetTextData(wsTag, 0, m_iTextDataLength);
-  }
-  void GetAttributeName(CFX_WideString& wsAttriName) const {
-    m_BlockBuffer.GetTextData(wsAttriName, 0, m_iTextDataLength);
-  }
-  void GetAttributeValue(CFX_WideString& wsAttriValue) const {
-    m_BlockBuffer.GetTextData(wsAttriValue, 0, m_iTextDataLength);
-  }
-  void GetTextData(CFX_WideString& wsText) const {
-    m_BlockBuffer.GetTextData(wsText, 0, m_iTextDataLength);
-  }
-  void GetTargetData(CFX_WideString& wsData) const {
-    m_BlockBuffer.GetTextData(wsData, 0, m_iTextDataLength);
-  }
-
- protected:
-  enum class FDE_XmlSyntaxState {
-    Text,
-    Node,
-    Target,
-    Tag,
-    AttriName,
-    AttriEqualSign,
-    AttriQuotation,
-    AttriValue,
-    Entity,
-    EntityDecimal,
-    EntityHex,
-    CloseInstruction,
-    BreakElement,
-    CloseElement,
-    SkipDeclNode,
-    DeclCharData,
-    SkipComment,
-    SkipCommentOrDecl,
-    SkipCData,
-    TargetData
-  };
-
-  void ParseTextChar(wchar_t ch);
-
-  CFX_RetainPtr<IFGAS_Stream> m_pStream;
-  int32_t m_iXMLPlaneSize;
-  int32_t m_iCurrentPos;
-  int32_t m_iCurrentNodeNum;
-  int32_t m_iLastNodeNum;
-  int32_t m_iParsedChars;
-  int32_t m_iParsedBytes;
-  wchar_t* m_pBuffer;
-  int32_t m_iBufferChars;
-  bool m_bEOS;
-  wchar_t* m_pStart;
-  wchar_t* m_pEnd;
-  FDE_XMLNODE m_CurNode;
-  std::stack<FDE_XMLNODE> m_XMLNodeStack;
-  CFDE_BlockBuffer m_BlockBuffer;
-  int32_t m_iAllocStep;
-  int32_t& m_iDataLength;
-  wchar_t* m_pCurrentBlock;
-  int32_t m_iIndexInBlock;
-  int32_t m_iTextDataLength;
-  FDE_XmlSyntaxResult m_syntaxParserResult;
-  FDE_XmlSyntaxState m_syntaxParserState;
-  wchar_t m_wQuotationMark;
-  int32_t m_iEntityStart;
-  std::stack<wchar_t> m_SkipStack;
-  wchar_t m_SkipChar;
-};
-
-#endif  // XFA_FDE_XML_FDE_XML_IMP_H_
diff --git a/xfa/fxfa/app/cxfa_textlayout.cpp b/xfa/fxfa/app/cxfa_textlayout.cpp
index 2470459..718f90b 100644
--- a/xfa/fxfa/app/cxfa_textlayout.cpp
+++ b/xfa/fxfa/app/cxfa_textlayout.cpp
@@ -17,7 +17,9 @@
 #include "xfa/fde/cfde_renderdevice.h"
 #include "xfa/fde/css/cfde_csscomputedstyle.h"
 #include "xfa/fde/css/cfde_cssstyleselector.h"
-#include "xfa/fde/xml/fde_xml_imp.h"
+#include "xfa/fde/xml/cfde_xmlelement.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
+#include "xfa/fde/xml/cfde_xmltext.h"
 #include "xfa/fxfa/app/cxfa_linkuserdata.h"
 #include "xfa/fxfa/app/cxfa_loadercontext.h"
 #include "xfa/fxfa/app/cxfa_pieceline.h"
diff --git a/xfa/fxfa/app/cxfa_textparser.cpp b/xfa/fxfa/app/cxfa_textparser.cpp
index 65155f9..b4032fa 100644
--- a/xfa/fxfa/app/cxfa_textparser.cpp
+++ b/xfa/fxfa/app/cxfa_textparser.cpp
@@ -15,6 +15,8 @@
 #include "xfa/fde/css/cfde_cssstyleselector.h"
 #include "xfa/fde/css/cfde_cssstylesheet.h"
 #include "xfa/fde/css/fde_css.h"
+#include "xfa/fde/xml/cfde_xmlelement.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
 #include "xfa/fgas/crt/fgas_codepage.h"
 #include "xfa/fgas/font/cfgas_fontmgr.h"
 #include "xfa/fxfa/app/cxfa_csstagprovider.h"
diff --git a/xfa/fxfa/app/xfa_ffwidgetacc.cpp b/xfa/fxfa/app/xfa_ffwidgetacc.cpp
index b6d4dec..760def2 100644
--- a/xfa/fxfa/app/xfa_ffwidgetacc.cpp
+++ b/xfa/fxfa/app/xfa_ffwidgetacc.cpp
@@ -14,7 +14,8 @@
 #include "third_party/base/ptr_util.h"
 #include "third_party/base/stl_util.h"
 #include "xfa/fde/cfde_textout.h"
-#include "xfa/fde/xml/fde_xml_imp.h"
+#include "xfa/fde/xml/cfde_xmlelement.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
 #include "xfa/fxfa/app/xfa_ffcheckbutton.h"
 #include "xfa/fxfa/app/xfa_ffchoicelist.h"
 #include "xfa/fxfa/app/xfa_fffield.h"
diff --git a/xfa/fxfa/cxfa_ffdoc.cpp b/xfa/fxfa/cxfa_ffdoc.cpp
index 0deb864..f48ae57 100644
--- a/xfa/fxfa/cxfa_ffdoc.cpp
+++ b/xfa/fxfa/cxfa_ffdoc.cpp
@@ -18,7 +18,8 @@
 #include "core/fxcrt/fx_ext.h"
 #include "core/fxcrt/fx_memory.h"
 #include "third_party/base/ptr_util.h"
-#include "xfa/fde/xml/fde_xml_imp.h"
+#include "xfa/fde/xml/cfde_xmlelement.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
 #include "xfa/fwl/cfwl_notedriver.h"
 #include "xfa/fxfa/app/xfa_ffnotify.h"
 #include "xfa/fxfa/cxfa_ffapp.h"
diff --git a/xfa/fxfa/cxfa_widgetacc.cpp b/xfa/fxfa/cxfa_widgetacc.cpp
index 9fee6bd..be7556e 100644
--- a/xfa/fxfa/cxfa_widgetacc.cpp
+++ b/xfa/fxfa/cxfa_widgetacc.cpp
@@ -11,7 +11,8 @@
 
 #include "third_party/base/stl_util.h"
 #include "xfa/fde/cfde_textout.h"
-#include "xfa/fde/xml/fde_xml_imp.h"
+#include "xfa/fde/xml/cfde_xmlelement.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
 #include "xfa/fxfa/app/cxfa_textlayout.h"
 #include "xfa/fxfa/app/xfa_ffwidgetacc.h"
 #include "xfa/fxfa/cxfa_ffapp.h"
diff --git a/xfa/fxfa/parser/cxfa_dataexporter.cpp b/xfa/fxfa/parser/cxfa_dataexporter.cpp
index f9553c4..fda29c2 100644
--- a/xfa/fxfa/parser/cxfa_dataexporter.cpp
+++ b/xfa/fxfa/parser/cxfa_dataexporter.cpp
@@ -10,7 +10,9 @@
 
 #include "core/fxcrt/fx_basic.h"
 #include "third_party/base/stl_util.h"
-#include "xfa/fde/xml/fde_xml_imp.h"
+#include "xfa/fde/xml/cfde_xmldoc.h"
+#include "xfa/fde/xml/cfde_xmlelement.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
 #include "xfa/fgas/crt/fgas_codepage.h"
 #include "xfa/fxfa/parser/cxfa_document.h"
 #include "xfa/fxfa/parser/cxfa_node.h"
@@ -46,12 +48,33 @@
   return textBuf.MakeString();
 }
 
+const uint16_t g_XMLValidCharRange[][2] = {{0x09, 0x09},
+                                           {0x0A, 0x0A},
+                                           {0x0D, 0x0D},
+                                           {0x20, 0xD7FF},
+                                           {0xE000, 0xFFFD}};
+bool IsXMLValidChar(wchar_t ch) {
+  int32_t iStart = 0;
+  int32_t iEnd = FX_ArraySize(g_XMLValidCharRange) - 1;
+  while (iStart <= iEnd) {
+    int32_t iMid = (iStart + iEnd) / 2;
+    if (ch < g_XMLValidCharRange[iMid][0]) {
+      iEnd = iMid - 1;
+    } else if (ch > g_XMLValidCharRange[iMid][1]) {
+      iStart = iMid + 1;
+    } else {
+      return true;
+    }
+  }
+  return false;
+}
+
 CFX_WideString ExportEncodeContent(const CFX_WideStringC& str) {
   CFX_WideTextBuf textBuf;
   int32_t iLen = str.GetLength();
   for (int32_t i = 0; i < iLen; i++) {
     wchar_t ch = str.GetAt(i);
-    if (!FDE_IsXMLValidChar(ch))
+    if (!IsXMLValidChar(ch))
       continue;
 
     if (ch == '&') {
diff --git a/xfa/fxfa/parser/cxfa_dataimporter.cpp b/xfa/fxfa/parser/cxfa_dataimporter.cpp
index 3ba304d..200841f 100644
--- a/xfa/fxfa/parser/cxfa_dataimporter.cpp
+++ b/xfa/fxfa/parser/cxfa_dataimporter.cpp
@@ -10,7 +10,7 @@
 
 #include "core/fxcrt/fx_stream.h"
 #include "third_party/base/ptr_util.h"
-#include "xfa/fde/xml/fde_xml_imp.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
 #include "xfa/fxfa/fxfa.h"
 #include "xfa/fxfa/fxfa_basic.h"
 #include "xfa/fxfa/parser/cxfa_document.h"
diff --git a/xfa/fxfa/parser/cxfa_document_parser.cpp b/xfa/fxfa/parser/cxfa_document_parser.cpp
index 90be568..b855513 100644
--- a/xfa/fxfa/parser/cxfa_document_parser.cpp
+++ b/xfa/fxfa/parser/cxfa_document_parser.cpp
@@ -7,6 +7,7 @@
 #include "xfa/fxfa/parser/cxfa_document_parser.h"
 
 #include "third_party/base/ptr_util.h"
+#include "xfa/fde/xml/cfde_xmldoc.h"
 #include "xfa/fxfa/fxfa.h"
 #include "xfa/fxfa/parser/cxfa_document.h"
 
diff --git a/xfa/fxfa/parser/cxfa_node.cpp b/xfa/fxfa/parser/cxfa_node.cpp
index 2828c98..61107bf 100644
--- a/xfa/fxfa/parser/cxfa_node.cpp
+++ b/xfa/fxfa/parser/cxfa_node.cpp
@@ -17,7 +17,9 @@
 #include "fxjs/cfxjse_value.h"
 #include "third_party/base/ptr_util.h"
 #include "third_party/base/stl_util.h"
-#include "xfa/fde/xml/fde_xml_imp.h"
+#include "xfa/fde/xml/cfde_xmlelement.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
+#include "xfa/fde/xml/cfde_xmltext.h"
 #include "xfa/fgas/crt/fgas_codepage.h"
 #include "xfa/fxfa/app/xfa_ffnotify.h"
 #include "xfa/fxfa/cxfa_eventparam.h"
diff --git a/xfa/fxfa/parser/cxfa_simple_parser.cpp b/xfa/fxfa/parser/cxfa_simple_parser.cpp
index 9204660..06e2e5d 100644
--- a/xfa/fxfa/parser/cxfa_simple_parser.cpp
+++ b/xfa/fxfa/parser/cxfa_simple_parser.cpp
@@ -11,7 +11,13 @@
 #include "core/fxcrt/cfx_checksumcontext.h"
 #include "core/fxcrt/fx_ext.h"
 #include "third_party/base/ptr_util.h"
-#include "xfa/fde/xml/cfde_xml_parser.h"
+#include "xfa/fde/xml/cfde_xmlchardata.h"
+#include "xfa/fde/xml/cfde_xmldoc.h"
+#include "xfa/fde/xml/cfde_xmlelement.h"
+#include "xfa/fde/xml/cfde_xmlinstruction.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
+#include "xfa/fde/xml/cfde_xmlparser.h"
+#include "xfa/fde/xml/cfde_xmltext.h"
 #include "xfa/fgas/crt/fgas_codepage.h"
 #include "xfa/fxfa/fxfa.h"
 #include "xfa/fxfa/parser/cxfa_document.h"
diff --git a/xfa/fxfa/parser/cxfa_simple_parser.h b/xfa/fxfa/parser/cxfa_simple_parser.h
index 3501041..a9bcec2 100644
--- a/xfa/fxfa/parser/cxfa_simple_parser.h
+++ b/xfa/fxfa/parser/cxfa_simple_parser.h
@@ -9,11 +9,13 @@
 
 #include <memory>
 
-#include "xfa/fde/xml/fde_xml_imp.h"
 #include "xfa/fxfa/fxfa_basic.h"
 
 class CXFA_Document;
 class CXFA_Node;
+class CFDE_XMLDoc;
+class CFDE_XMLInstruction;
+class CFDE_XMLNode;
 class CFDE_XMLParser;
 class IFX_SeekableReadStream;
 class IFX_Pause;
diff --git a/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp b/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
index e54bf4a..eb16628 100644
--- a/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
+++ b/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
@@ -11,7 +11,8 @@
 
 #include "core/fxcrt/fx_ext.h"
 #include "third_party/base/stl_util.h"
-#include "xfa/fde/xml/fde_xml_imp.h"
+#include "xfa/fde/xml/cfde_xmlelement.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
 #include "xfa/fxfa/parser/cxfa_document.h"
 #include "xfa/fxfa/parser/cxfa_layoutprocessor.h"
 #include "xfa/fxfa/parser/cxfa_localemgr.h"
diff --git a/xfa/fxfa/parser/xfa_utils.cpp b/xfa/fxfa/parser/xfa_utils.cpp
index 1323232..df180f2 100644
--- a/xfa/fxfa/parser/xfa_utils.cpp
+++ b/xfa/fxfa/parser/xfa_utils.cpp
@@ -7,7 +7,10 @@
 #include "xfa/fxfa/parser/xfa_utils.h"
 
 #include "core/fxcrt/fx_ext.h"
-#include "xfa/fde/xml/fde_xml_imp.h"
+#include "xfa/fde/xml/cfde_xmlchardata.h"
+#include "xfa/fde/xml/cfde_xmlelement.h"
+#include "xfa/fde/xml/cfde_xmlnode.h"
+#include "xfa/fde/xml/cfde_xmltext.h"
 #include "xfa/fxfa/parser/cxfa_document.h"
 #include "xfa/fxfa/parser/cxfa_localemgr.h"
 #include "xfa/fxfa/parser/cxfa_localevalue.h"
diff --git a/xfa/fxfa/parser/xfa_utils.h b/xfa/fxfa/parser/xfa_utils.h
index b428a89..d4461a3 100644
--- a/xfa/fxfa/parser/xfa_utils.h
+++ b/xfa/fxfa/parser/xfa_utils.h
@@ -7,7 +7,6 @@
 #ifndef XFA_FXFA_PARSER_XFA_UTILS_H_
 #define XFA_FXFA_PARSER_XFA_UTILS_H_
 
-#include "xfa/fde/xml/fde_xml.h"
 #include "xfa/fgas/crt/ifgas_stream.h"
 #include "xfa/fxfa/fxfa_basic.h"