in the attempt to fix 627393, changed IFX_FileRead's readBlock to return the length it reads

core/fxge/ge/cfx_font.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/fxge/fx_font.h"
 
 #include "core/fpdfapi/font/cpdf_font.h"
 #include "core/fxge/cfx_facecache.h"
@@ skipping 23 matching lines @@
 
 unsigned long FTStreamRead(FXFT_Stream stream,
                            unsigned long offset,
                            unsigned char* buffer,
                            unsigned long count) {
   if (count == 0)
     return 0;
 
   IFX_SeekableReadStream* pFile =
       static_cast<IFX_SeekableReadStream*>(stream->descriptor.pointer);
-  return pFile->ReadBlock(buffer, offset, count) ? count : 0;
+  return static_cast<unsigned long>(pFile->ReadBlock(buffer, offset, count));
 }
 
 void FTStreamClose(FXFT_Stream stream) {}
 
 bool LoadFileImp(FXFT_Library library,
                  FXFT_Face* Face,
                  IFX_SeekableReadStream* pFile,
                  int32_t faceIndex,
                  std::unique_ptr<FXFT_StreamRec>* stream) {
   std::unique_ptr<FXFT_StreamRec> stream1(new FXFT_StreamRec());
@@ skipping 652 matching lines @@
 const CFX_PathData* CFX_Font::LoadGlyphPath(uint32_t glyph_index,
                                             int dest_width) const {
   return GetFaceCache()->LoadGlyphPath(this, glyph_index, dest_width);
 }
 
 #ifdef _SKIA_SUPPORT_
 CFX_TypeFace* CFX_Font::GetDeviceCache() const {
   return GetFaceCache()->GetDeviceCache(this);
 }
 #endif