Revert "Revert "Revert "Revert "Cleanup some numeric code.""""

core/src/fxcrt/fx_xml_parser.cpp

Index: core/src/fxcrt/fx_xml_parser.cpp
diff --git a/core/src/fxcrt/fx_xml_parser.cpp b/core/src/fxcrt/fx_xml_parser.cpp
index dc59ded2b74ae87bd0a6e9b3ba1dce0133e32ee8..845fd84cfd1e9ffef365dcd9c259dccae86ec37a 100644
--- a/core/src/fxcrt/fx_xml_parser.cpp
+++ b/core/src/fxcrt/fx_xml_parser.cpp
@@ -5,7 +5,9 @@
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "../../include/fxcrt/fx_xml.h"
+#include "../../include/fxcrt/fx_ext.h"
 #include "xml_int.h"
+
 CXML_Parser::~CXML_Parser() {
   if (m_bOwnedStream) {
     m_pDataAcc->Release();
@@ -226,9 +228,8 @@ FX_DWORD CXML_Parser::GetCharRef() {
             iState = 10;
             break;
           }
-          if (g_FXCRT_XML_IsDigital(ch)) {
-            code = code * 10 + ch - '0';
-          }
+          if (g_FXCRT_XML_IsDigital(ch))
+            code = code * 10 + FXSYS_toDecimalDigit(ch);
           break;
         case 4:
           m_dwIndex++;
@@ -240,7 +241,7 @@ FX_DWORD CXML_Parser::GetCharRef() {
               g_FXCRT_XML_ByteTypes[ch] & FXCRTM_XML_CHARTYPE_HexChar;
           if (nHex) {
             if (nHex == FXCRTM_XML_CHARTYPE_HexDigital) {
-              code = (code << 4) + ch - '0';
+              code = (code << 4) + FXSYS_toDecimalDigit(ch);
             } else if (nHex == FXCRTM_XML_CHARTYPE_HexLowerLetter) {
               code = (code << 4) + ch - 87;
             } else {