Use override in more classes in fpdfsdk/

fpdfsdk/src/fpdfview.cpp

 // 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
 
 #include "../../core/include/fxcodec/fx_codec.h"
 #include "../../core/include/fxcrt/fx_safe_types.h"
 #include "../../public/fpdf_ext.h"
 #include "../../public/fpdf_progressive.h"
@@ skipping 53 matching lines @@
 #ifndef _T
 #define _T(x) x
 #endif
 
 CCodec_ModuleMgr* g_pCodecModule = nullptr;
 
 #if _FX_OS_ == _FX_LINUX_EMBEDDED_
 class CFontMapper : public IPDF_FontMapper {
  public:
   CFontMapper();
-  virtual ~CFontMapper();
+  ~CFontMapper() override;
 
-  virtual FT_Face FindSubstFont(
+  // IPDF_FontMapper
+  FT_Face FindSubstFont(
       CPDF_Document* pDoc,              // [IN] The PDF document
       const CFX_ByteString& face_name,  // [IN] Original name
       FX_BOOL bTrueType,                // [IN] TrueType or Type1
       FX_DWORD flags,   // [IN] PDF font flags (see PDF Reference section 5.7.1)
       int font_weight,  // [IN] original font weight. 0 for not specified
       int CharsetCP,    // [IN] code page for charset (see Win32 GetACP())
       FX_BOOL bVertical,
       CPDF_SubstFont* pSubstFont  // [OUT] Subst font data
-      );
+      ) override;
 
   FT_Face m_SysFace;
 };
 
 CFontMapper* g_pFontMapper = NULL;
 #endif  // #if _FX_OS_ == _FX_LINUX_EMBEDDED_
 
 DLLEXPORT void STDCALL FPDF_InitLibrary() {
   FPDF_InitLibraryWithConfig(nullptr);
 }
@@ skipping 101 matching lines @@
         pdfium::base::checked_cast<FX_FILESIZE, size_t>(size);
     newPos += offset;
     if (!newPos.IsValid() || newPos.ValueOrDie() > (FX_DWORD)m_size) {
       return FALSE;
     }
     FXSYS_memcpy(buffer, m_pBuf + offset, size);
     return TRUE;
   }
 
  private:
+  ~CMemFile() {}
+
   uint8_t* m_pBuf;
   FX_FILESIZE m_size;
 };
 DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_LoadMemDocument(const void* data_buf,
                                                      int size,
                                                      FPDF_BYTESTRING password) {
   CPDF_Parser* pParser = new CPDF_Parser;
   pParser->SetPassword(password);
   CMemFile* pMemFile = new CMemFile((uint8_t*)data_buf, size);
   FX_DWORD err_code = pParser->StartParse(pMemFile);
@@ skipping 695 matching lines @@
   if (!buffer) {
     *buflen = len;
   } else if (*buflen >= len) {
     memcpy(buffer, utf16Name.c_str(), len);
     *buflen = len;
   } else {
     *buflen = -1;
   }
   return (FPDF_DEST)pDestObj;
 }