Extern in .cpp file is a code smell, part 2.

core/src/fpdftext/text_int.h

 // 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 CORE_SRC_FPDFTEXT_TEXT_INT_H_
 #define CORE_SRC_FPDFTEXT_TEXT_INT_H_
 
+#include "../../include/fpdftext/fpdf_text.h"
+#include "../../include/fxcrt/fx_basic.h"
+
+class CFX_BidiChar;
+class CPDF_DocProgressiveSearch;
+class CPDF_FormObject;
 class CPDF_LinkExtract;
 class CPDF_TextPageFind;
-class CPDF_DocProgressiveSearch;
+
 #define FPDFTEXT_CHAR_ERROR -1
 #define FPDFTEXT_CHAR_NORMAL 0
 #define FPDFTEXT_CHAR_GENERATED 1
 #define FPDFTEXT_CHAR_UNUNICODE 2
 #define FPDFTEXT_CHAR_HYPHEN 3
 #define FPDFTEXT_CHAR_PIECE 4
 #define FPDFTEXT_MC_PASS 0
 #define FPDFTEXT_MC_DONE 1
 #define FPDFTEXT_MC_DELAY 2
+
 typedef struct _PAGECHAR_INFO {
   int m_CharCode;
   FX_WCHAR m_Unicode;
   FX_FLOAT m_OriginX;
   FX_FLOAT m_OriginY;
   int32_t m_Flag;
   CFX_FloatRect m_CharBox;
   CPDF_TextObject* m_pTextObj;
   CFX_AffineMatrix m_Matrix;
   int m_Index;
@@ skipping 196 matching lines @@
  private:
   LINK_InfoArray m_LinkList;
   const CPDF_TextPage* m_pTextPage;
   CFX_WideString m_strPageText;
   FX_BOOL m_IsParserd;
 };
 
 FX_STRSIZE FX_Unicode_GetNormalization(FX_WCHAR wch, FX_WCHAR* pDst);
 void NormalizeString(CFX_WideString& str);
 void NormalizeCompositeChar(FX_WCHAR wChar, CFX_WideString& sDest);
+void GetTextStream_Unicode(CFX_WideTextBuf& buffer,
+                           CPDF_PageObjects* pPage,
+                           FX_BOOL bUseLF,
+                           CFX_PtrArray* pObjArray);
 
 #endif  // CORE_SRC_FPDFTEXT_TEXT_INT_H_