Re-enable several MSVC warnings

core/fpdfapi/fpdf_page/fpdf_page_parser_old.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/fpdfapi/fpdf_page/pageint.h"
 
 #include <limits.h>
 
@@ skipping 23 matching lines @@
   m_Pos = 0;
   m_pLastObj = NULL;
 }
 
 CPDF_StreamParser::~CPDF_StreamParser() {
   if (m_pLastObj) {
     m_pLastObj->Release();
   }
 }
 
-FX_DWORD _DecodeAllScanlines(ICodec_ScanlineDecoder* pDecoder,
-                             uint8_t*& dest_buf,
-                             FX_DWORD& dest_size) {
+FX_DWORD DecodeAllScanlines(ICodec_ScanlineDecoder* pDecoder,
+                            uint8_t*& dest_buf,
+                            FX_DWORD& dest_size) {
   if (!pDecoder) {
-    return (FX_DWORD)-1;
+    return static_cast<FX_DWORD>(-1);
   }
   int ncomps = pDecoder->CountComps();
   int bpc = pDecoder->GetBPC();
   int width = pDecoder->GetWidth();
   int height = pDecoder->GetHeight();
   int pitch = (width * ncomps * bpc + 7) / 8;
   if (height == 0 || pitch > (1 << 30) / height) {
     delete pDecoder;
-    return -1;
+    return static_cast<FX_DWORD>(-1);
   }
   dest_buf = FX_Alloc2D(uint8_t, pitch, height);
   dest_size = pitch * height;  // Safe since checked alloc returned.
   for (int row = 0; row < height; row++) {
     const uint8_t* pLine = pDecoder->GetScanline(row);
     if (!pLine)
       break;
 
     FXSYS_memcpy(dest_buf + row * pitch, pLine, pitch);
   }
@@ skipping 13 matching lines @@
                                 FX_DWORD limit,
                                 int width,
                                 int height,
                                 CFX_ByteString& decoder,
                                 CPDF_Dictionary* pParam,
                                 uint8_t*& dest_buf,
                                 FX_DWORD& dest_size) {
   if (decoder == "CCITTFaxDecode" || decoder == "CCF") {
     ICodec_ScanlineDecoder* pDecoder =
         FPDFAPI_CreateFaxDecoder(src_buf, limit, width, height, pParam);
-    return _DecodeAllScanlines(pDecoder, dest_buf, dest_size);
+    return DecodeAllScanlines(pDecoder, dest_buf, dest_size);
   }
   if (decoder == "ASCII85Decode" || decoder == "A85") {
     return A85Decode(src_buf, limit, dest_buf, dest_size);
   }
   if (decoder == "ASCIIHexDecode" || decoder == "AHx") {
     return HexDecode(src_buf, limit, dest_buf, dest_size);
   }
   if (decoder == "FlateDecode" || decoder == "Fl") {
     return FPDFAPI_FlateOrLZWDecode(FALSE, src_buf, limit, pParam, dest_size,
                                     dest_buf, dest_size);
   }
   if (decoder == "LZWDecode" || decoder == "LZW") {
     return FPDFAPI_FlateOrLZWDecode(TRUE, src_buf, limit, pParam, 0, dest_buf,
                                     dest_size);
   }
   if (decoder == "DCTDecode" || decoder == "DCT") {
     ICodec_ScanlineDecoder* pDecoder =
         CPDF_ModuleMgr::Get()->GetJpegModule()->CreateDecoder(
             src_buf, limit, width, height, 0,
             pParam ? pParam->GetIntegerBy("ColorTransform", 1) : 1);
-    return _DecodeAllScanlines(pDecoder, dest_buf, dest_size);
+    return DecodeAllScanlines(pDecoder, dest_buf, dest_size);
   }
   if (decoder == "RunLengthDecode" || decoder == "RL") {
     return RunLengthDecode(src_buf, limit, dest_buf, dest_size);
   }
   dest_size = 0;
   dest_buf = 0;
   return (FX_DWORD)-1;
 }
 
 CPDF_Stream* CPDF_StreamParser::ReadInlineStream(CPDF_Document* pDoc,
@@ skipping 760 matching lines @@
       }
       m_Status = Done;
       return;
     }
     steps++;
     if (pPause && pPause->NeedToPauseNow()) {
       break;
     }
   }
 }