Fix memory management errors for font loading and copying

xfa/fgas/font/fgas_gefont.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 XFA_FGAS_FONT_FGAS_GEFONT_H_
 #define XFA_FGAS_FONT_FGAS_GEFONT_H_
 
 #include <map>
@@ skipping 47 matching lines @@
   void SetFontProvider(CXFA_PDFFontMgr* pProvider) { m_pProvider = pProvider; }
 #if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
   void SetLogicalFontStyle(uint32_t dwLogFontStyle) {
     m_bUseLogFontStyle = TRUE;
     m_dwLogFontStyle = dwLogFontStyle;
   }
 #endif
 
  protected:
   explicit CFGAS_GEFont(IFGAS_FontMgr* pFontMgr);
-  CFGAS_GEFont(const CFGAS_GEFont& src, uint32_t dwFontStyles);
+  CFGAS_GEFont(CFGAS_GEFont* src, uint32_t dwFontStyles);
 
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
   FX_BOOL LoadFontInternal(const FX_WCHAR* pszFontFamily,
                            uint32_t dwFontStyles,
                            uint16_t wCodePage);
   FX_BOOL LoadFontInternal(const uint8_t* pBuffer, int32_t length);
   FX_BOOL LoadFontInternal(IFX_Stream* pFontStream, FX_BOOL bSaveStream);
 #endif
   FX_BOOL LoadFontInternal(CFX_Font* pExtFont);
   FX_BOOL InitFont();
   FX_BOOL GetCharBBoxInternal(FX_WCHAR wUnicode,
                               CFX_Rect& bbox,
                               FX_BOOL bRecursive,
                               FX_BOOL bCharCode = FALSE);
   FX_BOOL GetCharWidthInternal(FX_WCHAR wUnicode,
                                int32_t& iWidth,
                                FX_BOOL bRecursive,
                                FX_BOOL bCharCode = FALSE);
   int32_t GetGlyphIndex(FX_WCHAR wUnicode,
                         FX_BOOL bRecursive,
                         CFGAS_GEFont** ppFont,
                         FX_BOOL bCharCode = FALSE);
 
 #if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
   FX_BOOL m_bUseLogFontStyle;
   uint32_t m_dwLogFontStyle;
 #endif
   CFX_Font* m_pFont;
+  CFGAS_GEFont* const m_pSrcFont;
   IFGAS_FontMgr* const m_pFontMgr;
   int32_t m_iRefCount;
   FX_BOOL m_bExtFont;
   std::unique_ptr<IFX_Stream, ReleaseDeleter<IFX_Stream>> m_pStream;
   std::unique_ptr<IFX_FileRead, ReleaseDeleter<IFX_FileRead>> m_pFileRead;
   std::unique_ptr<CFX_UnicodeEncoding> m_pFontEncoding;
   std::unique_ptr<CFX_DiscreteArrayTemplate<uint16_t>> m_pCharWidthMap;
   std::unique_ptr<CFX_MassArrayTemplate<CFX_Rect>> m_pRectArray;
   std::unique_ptr<CFX_MapPtrToPtr> m_pBBoxMap;
   CXFA_PDFFontMgr* m_pProvider;  // not owned.
   CFX_ArrayTemplate<CFGAS_GEFont*> m_SubstFonts;
   std::map<FX_WCHAR, CFGAS_GEFont*> m_FontMapper;
 };
 
 #endif  // XFA_FGAS_FONT_FGAS_GEFONT_H_