Detect resursive loading of type3 font char to avoid infinite loop

core/fpdfapi/fpdf_font/cpdf_simplefont.cpp

 // Copyright 2016 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_font/cpdf_simplefont.h"
 
 #include "core/fpdfapi/fpdf_font/font_int.h"
 #include "core/fpdfapi/fpdf_parser/cpdf_array.h"
@@ skipping 60 matching lines @@
       m_CharWidth[charcode] = TT_Width;
     } else if (TT_Width && !IsEmbedded()) {
       m_CharBBox[charcode].right =
           m_CharBBox[charcode].right * m_CharWidth[charcode] / TT_Width;
       m_CharBBox[charcode].left =
           m_CharBBox[charcode].left * m_CharWidth[charcode] / TT_Width;
     }
   }
 }
 
-int CPDF_SimpleFont::GetCharWidthF(uint32_t charcode, int level) {
+int CPDF_SimpleFont::GetCharWidthF(uint32_t charcode) {
   if (charcode > 0xff)
     charcode = 0;
 
   if (m_CharWidth[charcode] == 0xffff) {
     LoadCharMetrics(charcode);
     if (m_CharWidth[charcode] == 0xffff) {
       m_CharWidth[charcode] = 0;
     }
   }
   return m_CharWidth[charcode];
 }
 
-FX_RECT CPDF_SimpleFont::GetCharBBox(uint32_t charcode, int level) {
+FX_RECT CPDF_SimpleFont::GetCharBBox(uint32_t charcode) {
   if (charcode > 0xff)
     charcode = 0;
 
   if (m_CharBBox[charcode].left == -1)
     LoadCharMetrics(charcode);
 
   return m_CharBBox[charcode];
 }
 
 bool CPDF_SimpleFont::LoadCommon() {
@@ skipping 102 matching lines @@
     return CFX_WideString();
   return ret;
 }
 
 uint32_t CPDF_SimpleFont::CharCodeFromUnicode(FX_WCHAR unicode) const {
   uint32_t ret = CPDF_Font::CharCodeFromUnicode(unicode);
   if (ret)
     return ret;
   return m_Encoding.CharCodeFromUnicode(unicode);
 }