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diff --git a/xfa/fde/css/cfde_csssyntaxparser.h b/xfa/fde/css/cfde_csssyntaxparser.h
new file mode 100644
index 0000000000..131fe4bf21
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+++ b/xfa/fde/css/cfde_csssyntaxparser.h
@@ -0,0 +1,88 @@
+// 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_CSS_CFDE_CSSSYNTAXPARSER_H_
+#define XFA_FDE_CSS_CFDE_CSSSYNTAXPARSER_H_
+
+#include <stack>
+
+#include "xfa/fde/css/cfde_csstextbuf.h"
+
+#define FDE_CSSSYNTAXCHECK_AllowCharset 1
+#define FDE_CSSSYNTAXCHECK_AllowImport 2
+
+enum class FDE_CSSSyntaxMode {
+  RuleSet,
+  Comment,
+  AtRule,
+  UnknownRule,
+  Charset,
+  Import,
+  MediaRule,
+  URI,
+  MediaType,
+  Selector,
+  PropertyName,
+  PropertyValue,
+};
+
+enum class FDE_CSSSyntaxStatus : uint8_t {
+  Error,
+  EOS,
+  None,
+  Charset,
+  ImportRule,
+  ImportClose,
+  PageRule,
+  StyleRule,
+  FontFaceRule,
+  MediaRule,
+  MediaType,
+  URI,
+  Selector,
+  DeclOpen,
+  DeclClose,
+  PropertyName,
+  PropertyValue,
+};
+
+class CFDE_CSSSyntaxParser {
+ public:
+  CFDE_CSSSyntaxParser();
+  ~CFDE_CSSSyntaxParser();
+
+  bool Init(const FX_WCHAR* pBuffer,
+            int32_t iBufferSize,
+            int32_t iTextDatSize = 32,
+            bool bOnlyDeclaration = false);
+  FDE_CSSSyntaxStatus DoSyntaxParse();
+  const FX_WCHAR* GetCurrentString(int32_t& iLength) const;
+
+ protected:
+  void Reset(bool bOnlyDeclaration);
+  void SwitchMode(FDE_CSSSyntaxMode eMode);
+  int32_t SwitchToComment();
+
+  bool RestoreMode();
+  bool AppendChar(FX_WCHAR wch);
+  int32_t SaveTextData();
+  bool IsCharsetEnabled() const {
+    return (m_dwCheck & FDE_CSSSYNTAXCHECK_AllowCharset) != 0;
+  }
+  void DisableCharset() { m_dwCheck = FDE_CSSSYNTAXCHECK_AllowImport; }
+  bool IsImportEnabled() const;
+  void DisableImport() { m_dwCheck = 0; }
+
+  CFDE_CSSTextBuf m_TextData;
+  CFDE_CSSTextBuf m_TextPlane;
+  int32_t m_iTextDatLen;
+  uint32_t m_dwCheck;
+  FDE_CSSSyntaxMode m_eMode;
+  FDE_CSSSyntaxStatus m_eStatus;
+  std::stack<FDE_CSSSyntaxMode> m_ModeStack;
+};
+
+#endif  // XFA_FDE_CSS_CFDE_CSSSYNTAXPARSER_H_