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diff --git a/xfa/fde/css/cfde_cssstylesheet.h b/xfa/fde/css/cfde_cssstylesheet.h
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+++ b/xfa/fde/css/cfde_cssstylesheet.h
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+// 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_CSSSTYLESHEET_H_
+#define XFA_FDE_CSS_CFDE_CSSSTYLESHEET_H_
+
+#include <memory>
+#include <unordered_map>
+#include <vector>
+
+#include "core/fxcrt/fx_basic.h"
+#include "core/fxcrt/fx_string.h"
+#include "xfa/fde/css/cfde_csssyntaxparser.h"
+
+class CFDE_CSSRule;
+
+class CFDE_CSSStyleSheet : public IFX_Retainable {
+ public:
+  CFDE_CSSStyleSheet();
+  ~CFDE_CSSStyleSheet() override;
+
+  // IFX_Retainable:
+  uint32_t Retain() override;
+  uint32_t Release() override;
+
+  bool LoadFromBuffer(const FX_WCHAR* pBuffer, int32_t iBufSize);
+
+  uint32_t GetMediaList() const;
+  int32_t CountRules() const;
+  CFDE_CSSRule* GetRule(int32_t index);
+
+ private:
+  void Reset();
+  bool LoadFromSyntax(CFDE_CSSSyntaxParser* pSyntax);
+  FDE_CSSSyntaxStatus LoadStyleRule(
+      CFDE_CSSSyntaxParser* pSyntax,
+      std::vector<std::unique_ptr<CFDE_CSSRule>>* ruleArray);
+  FDE_CSSSyntaxStatus LoadImportRule(CFDE_CSSSyntaxParser* pSyntax);
+  FDE_CSSSyntaxStatus LoadPageRule(CFDE_CSSSyntaxParser* pSyntax);
+  FDE_CSSSyntaxStatus LoadMediaRule(CFDE_CSSSyntaxParser* pSyntax);
+  FDE_CSSSyntaxStatus LoadFontFaceRule(
+      CFDE_CSSSyntaxParser* pSyntax,
+      std::vector<std::unique_ptr<CFDE_CSSRule>>* ruleArray);
+  FDE_CSSSyntaxStatus SkipRuleSet(CFDE_CSSSyntaxParser* pSyntax);
+
+  uint16_t m_wRefCount;
+  uint32_t m_dwMediaList;
+  std::vector<std::unique_ptr<CFDE_CSSRule>> m_RuleArray;
+  std::unordered_map<uint32_t, FX_WCHAR*> m_StringCache;
+};
+
+#endif  // XFA_FDE_CSS_CFDE_CSSSTYLESHEET_H_