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

core/include/fpdfapi/fpdf_parser.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_INCLUDE_FPDFAPI_FPDF_PARSER_H_
 #define CORE_INCLUDE_FPDFAPI_FPDF_PARSER_H_
 
 #include "../fxcrt/fx_system.h"
@@ skipping 33 matching lines @@
 #define FPDFPERM_PRINT_HIGH 0x0800
 #define FPDF_PAGE_MAX_NUM 0xFFFFF
 
 // Indexed by 8-bit character code, contains either:
 //   'W' - for whitespace: NUL, TAB, CR, LF, FF, 0x80, 0xff
 //   'N' - for numeric: 0123456789+-.
 //   'D' - for delimiter: %()/<>[]{}
 //   'R' - otherwise.
 extern const char PDF_CharType[256];
 
+// Indexed by 8-bit char code, contains unicode code points.
+extern const FX_WORD PDFDocEncoding[256];
+
 class CPDF_Document : public CFX_PrivateData, public CPDF_IndirectObjects {
  public:
   CPDF_Document();
   explicit CPDF_Document(CPDF_Parser* pParser);
 
   ~CPDF_Document();
 
   CPDF_Parser* GetParser() const { return m_pParser; }
 
   CPDF_Dictionary* GetRoot() const { return m_pRootDict; }
@@ skipping 850 matching lines @@
   PDF_DATAAVAIL_PAGETREE,
   PDF_DATAAVAIL_PAGE,
   PDF_DATAAVAIL_PAGE_LATERLOAD,
   PDF_DATAAVAIL_RESOURCES,
   PDF_DATAAVAIL_DONE,
   PDF_DATAAVAIL_ERROR,
   PDF_DATAAVAIL_LOADALLFILE,
   PDF_DATAAVAIL_TRAILER_APPEND
 };
 
+FX_BOOL PDF_DataDecode(const uint8_t* src_buf,
+                       FX_DWORD src_size,
+                       const CPDF_Dictionary* pDict,
+                       uint8_t*& dest_buf,
+                       FX_DWORD& dest_size,
+                       CFX_ByteString& ImageEncoding,
+                       CPDF_Dictionary*& pImageParms,
+                       FX_DWORD estimated_size,
+                       FX_BOOL bImageAcc);
+
 #endif  // CORE_INCLUDE_FPDFAPI_FPDF_PARSER_H_