Use override in more classes in fpdfsdk/

fpdfsdk/src/fpdf_dataavail.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 "../../public/fpdf_dataavail.h"
 #include "../include/fsdk_define.h"
 
 extern void ProcessParseError(FX_DWORD err_code);
 class CFPDF_FileAvailWrap : public IFX_FileAvail {
  public:
   CFPDF_FileAvailWrap() { m_pfileAvail = NULL; }
+  ~CFPDF_FileAvailWrap() override {}
 
   void Set(FX_FILEAVAIL* pfileAvail) { m_pfileAvail = pfileAvail; }
 
-  virtual FX_BOOL IsDataAvail(FX_FILESIZE offset, FX_DWORD size) {
+  // IFX_FileAvail
+  FX_BOOL IsDataAvail(FX_FILESIZE offset, FX_DWORD size) override {
     return m_pfileAvail->IsDataAvail(m_pfileAvail, offset, size);
   }
 
  private:
   FX_FILEAVAIL* m_pfileAvail;
 };
 
 class CFPDF_FileAccessWrap : public IFX_FileRead {
  public:
   CFPDF_FileAccessWrap() { m_pFileAccess = NULL; }
+  ~CFPDF_FileAccessWrap() override {}
 
   void Set(FPDF_FILEACCESS* pFile) { m_pFileAccess = pFile; }
 
-  virtual FX_FILESIZE GetSize() { return m_pFileAccess->m_FileLen; }
+  // IFX_FileRead
+  FX_FILESIZE GetSize() override { return m_pFileAccess->m_FileLen; }
 
-  virtual FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) {
+  FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override {
     return m_pFileAccess->m_GetBlock(m_pFileAccess->m_Param, offset,
                                      (uint8_t*)buffer, size);
   }
 
-  virtual void Release() {}
+  void Release() override {}
 
  private:
   FPDF_FILEACCESS* m_pFileAccess;
 };
 
 class CFPDF_DownloadHintsWrap : public IFX_DownloadHints {
  public:
-  CFPDF_DownloadHintsWrap(FX_DOWNLOADHINTS* pDownloadHints) {
+  explicit CFPDF_DownloadHintsWrap(FX_DOWNLOADHINTS* pDownloadHints) {
     m_pDownloadHints = pDownloadHints;
   }
+  ~CFPDF_DownloadHintsWrap() override {}
 
  public:
-  virtual void AddSegment(FX_FILESIZE offset, FX_DWORD size) {
+  // IFX_DownloadHints
+  void AddSegment(FX_FILESIZE offset, FX_DWORD size) override {
     m_pDownloadHints->AddSegment(m_pDownloadHints, offset, size);
   }
 
  private:
   FX_DOWNLOADHINTS* m_pDownloadHints;
 };
 
 class CFPDF_DataAvail {
  public:
   CFPDF_DataAvail() { m_pDataAvail = NULL; }
@@ skipping 71 matching lines @@
     return -1;
   CFPDF_DownloadHintsWrap hints_wrap(hints);
   return ((CFPDF_DataAvail*)avail)->m_pDataAvail->IsFormAvail(&hints_wrap);
 }
 
 DLLEXPORT FPDF_BOOL STDCALL FPDFAvail_IsLinearized(FPDF_AVAIL avail) {
   if (avail == NULL)
     return -1;
   return ((CFPDF_DataAvail*)avail)->m_pDataAvail->IsLinearizedPDF();
 }