Force compiler to deduce src type for checked_cast<dst, src>.

fpdfsdk/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 "public/fpdfview.h"
 
 #include <memory>
 #include <utility>
@@ skipping 174 matching lines @@
 void CPDF_CustomAccess::Release() {
   delete this;
 }
 
 bool CPDF_CustomAccess::ReadBlock(void* buffer,
                                   FX_FILESIZE offset,
                                   size_t size) {
   if (offset < 0)
     return false;
 
-  FX_SAFE_FILESIZE newPos =
-      pdfium::base::checked_cast<FX_FILESIZE, size_t>(size);
+  FX_SAFE_FILESIZE newPos = pdfium::base::checked_cast<FX_FILESIZE>(size);
   newPos += offset;
   if (!newPos.IsValid() ||
       newPos.ValueOrDie() > static_cast<FX_FILESIZE>(m_FileAccess.m_FileLen)) {
     return false;
   }
   return !!m_FileAccess.m_GetBlock(m_FileAccess.m_Param, offset,
                                    reinterpret_cast<uint8_t*>(buffer), size);
 }
 
 // 0 bit: FPDF_POLICY_MACHINETIME_ACCESS
@@ skipping 174 matching lines @@
 class CMemFile final : public IFX_SeekableReadStream {
  public:
   CMemFile(uint8_t* pBuf, FX_FILESIZE size) : m_pBuf(pBuf), m_size(size) {}
 
   void Release() override { delete this; }
   FX_FILESIZE GetSize() override { return m_size; }
   bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override {
     if (offset < 0) {
       return false;
     }
-    FX_SAFE_FILESIZE newPos =
-        pdfium::base::checked_cast<FX_FILESIZE, size_t>(size);
+    FX_SAFE_FILESIZE newPos = pdfium::base::checked_cast<FX_FILESIZE>(size);
     newPos += offset;
     if (!newPos.IsValid() || newPos.ValueOrDie() > m_size) {
       return false;
     }
     FXSYS_memcpy(buffer, m_pBuf + offset, size);
     return true;
   }
 
  private:
   ~CMemFile() override {}
@@ skipping 707 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;
 }