Fix more sign comparison errors.

core/include/fpdfapi/fpdf_resource.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_RESOURCE_H_
 #define CORE_INCLUDE_FPDFAPI_FPDF_RESOURCE_H_
 
 #include "../fxcrt/fx_system.h"
 #include "../fxge/fx_font.h"
 #include "fpdf_parser.h"
 
 class CFX_CTTGSUBTable;
 class CFX_DIBitmap;
 class CFX_Font;
 class CFX_SubstFont;
 class CPDF_CID2UnicodeMap;
 class CPDF_CIDFont;
 class CPDF_CMap;
 class CPDF_Color;
 class CPDF_ColorSpace;
 class CPDF_Face;
-class CPDF_Font;
 class CPDF_FontEncoding;
 class CPDF_Form;
 class CPDF_Function;
 class CPDF_Image;
 class CPDF_ImageObject;
 class CPDF_Page;
 class CPDF_Pattern;
 class CPDF_RenderContext;
 class CPDF_ShadingPattern;
 class CPDF_TilingPattern;
@@ skipping 59 matching lines @@
 #define PDFFONT_ALLCAP 0x10000
 #define PDFFONT_SMALLCAP 0x20000
 #define PDFFONT_FORCEBOLD 0x40000
 #define PDFFONT_USEEXTERNATTR 0x80000
 class CPDF_Font {
  public:
   static CPDF_Font* CreateFontF(CPDF_Document* pDoc,
                                 CPDF_Dictionary* pFontDict);
   static CPDF_Font* GetStockFont(CPDF_Document* pDoc,
                                  const CFX_ByteStringC& fontname);
+  static const FX_DWORD kInvalidCharCode = static_cast<FX_DWORD>(-1);
 
   virtual ~CPDF_Font();
 
   bool IsFontType(int fonttype) const { return fonttype == m_FontType; }
   int GetFontType() const { return m_FontType; }
 
   CFX_ByteString GetFontTypeName() const;
 
   const CFX_ByteString& GetBaseFont() const { return m_BaseFont; }
 
@@ skipping 719 matching lines @@
 
   FX_BOOL m_bInterpolate;
 
   CPDF_Document* m_pDocument;
 
   CPDF_Dictionary* m_pOC;
   CPDF_Dictionary* InitJPEG(uint8_t* pData, FX_DWORD size);
 };
 
 #endif  // CORE_INCLUDE_FPDFAPI_FPDF_RESOURCE_H_