Try UnicodeFromCharCode even with PDFFONT_SYMBOLIC

core/fpdfapi/fpdf_font/cpdf_cidfont.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_cidfont.h"
 
 #include <algorithm>
 #include <vector>
@@ skipping 613 matching lines @@
       if (uni_str.IsEmpty())
         return cid;
 
       unicode = uni_str.GetAt(0);
 #endif
     } else {
       if (cid && m_pCID2UnicodeMap && m_pCID2UnicodeMap->IsLoaded())
         unicode = m_pCID2UnicodeMap->UnicodeFromCID(cid);
       if (unicode == 0)
         unicode = GetUnicodeFromCharCode(charcode);
-      if (unicode == 0 && !(m_Flags & PDFFONT_SYMBOLIC))
-        unicode = UnicodeFromCharCode(charcode).GetAt(0);
+      if (unicode == 0) {
+        CFX_WideString unicode_str = UnicodeFromCharCode(charcode);
+        if (!unicode_str.IsEmpty())
+          unicode = unicode_str.GetAt(0);
+      }
     }
     FXFT_Face face = m_Font.GetFace();
     if (unicode == 0) {
       if (!m_bAdobeCourierStd)
         return charcode ? static_cast<int>(charcode) : -1;
 
       charcode += 31;
       bool bMSUnicode = FT_UseTTCharmap(face, 3, 1);
       bool bMacRoman = !bMSUnicode && FT_UseTTCharmap(face, 1, 0);
       int iBaseEncoding = PDFFONT_ENCODING_STANDARD;
@@ skipping 204 matching lines @@
 const uint8_t* CPDF_CIDFont::GetCIDTransform(uint16_t CID) const {
   if (m_Charset != CIDSET_JAPAN1 || m_pFontFile)
     return nullptr;
 
   const auto* pEnd = g_Japan1_VertCIDs + FX_ArraySize(g_Japan1_VertCIDs);
   const auto* pTransform = std::lower_bound(
       g_Japan1_VertCIDs, pEnd, CID,
       [](const CIDTransform& entry, uint16_t cid) { return entry.cid < cid; });
   return pTransform < pEnd && CID == pTransform->cid ? &pTransform->a : nullptr;
 }