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

core/fxge/android/fpf_skiafontmgr.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/fxcrt/include/fx_system.h"
 
 #if _FX_OS_ == _FX_ANDROID_
 
@@ skipping 12 matching lines @@
 #endif
 static unsigned long FPF_SkiaStream_Read(FXFT_Stream stream,
                                          unsigned long offset,
                                          unsigned char* buffer,
                                          unsigned long count) {
   IFX_FileRead* pFileRead = (IFX_FileRead*)stream->descriptor.pointer;
   if (!pFileRead) {
     return 0;
   }
   if (count > 0) {
-    if (!pFileRead->ReadBlock(buffer, (FX_FILESIZE)offset, (size_t)count)) {
+    if (pFileRead->ReadBlock(buffer, (FX_FILESIZE)offset, (size_t)count) !=
+            static_cast<size_t>(count) &&
+        !pFileRead->IsEOF()) {
       return 0;
     }
   }
   return count;
 }
 static void FPF_SkiaStream_Close(FXFT_Stream stream) {}
 #ifdef __cplusplus
 };
 #endif
 struct FPF_SKIAFONTMAP {
@@ skipping 470 matching lines @@
   }
   if (pOS2 && (pOS2->ulCodePageRange1 & (1 << 31))) {
     pFontDesc->m_dwStyle |= FXFONT_SYMBOLIC;
   }
   pFontDesc->m_dwCharsets = FPF_SkiaGetFaceCharset(pOS2);
   pFontDesc->m_iFaceIndex = face->face_index;
   pFontDesc->m_iGlyphNum = face->num_glyphs;
 }
 void CFPF_SkiaFontMgr::OutputSystemFonts() {}
 #endif