2 files changed, 10 insertions, 7 deletions
diff --git a/core/fpdfapi/font/fpdf_font.cpp b/core/fpdfapi/font/fpdf_font.cpp
index 6c48098c8a..4702947fd3 100644
--- a/core/fpdfapi/font/fpdf_font.cpp
+++ b/core/fpdfapi/font/fpdf_font.cpp
@@ -142,12 +142,12 @@ uint32_t CPDF_ToUnicodeMap::StringToCode(const CFX_ByteStringC& str) {
   uint32_t result = 0;
   if (str[0] == '<') {
     for (int i = 1; i < len && std::isxdigit(str[i]); ++i)
-      result = result * 16 + FXSYS_toHexDigit(str.CharAt(i));
+      result = result * 16 + FXSYS_HexCharToInt(str.CharAt(i));
     return result;
   }
 
   for (int i = 0; i < len && std::isdigit(str[i]); ++i)
-    result = result * 10 + FXSYS_toDecimalDigit(str.CharAt(i));
+    result = result * 10 + FXSYS_DecimalCharToInt(str.CharAt(i));
 
   return result;
 }
@@ -183,7 +183,7 @@ CFX_WideString CPDF_ToUnicodeMap::StringToWideString(
     int byte_pos = 0;
     wchar_t ch = 0;
     for (int i = 1; i < len && std::isxdigit(str[i]); ++i) {
-      ch = ch * 16 + FXSYS_toHexDigit(str[i]);
+      ch = ch * 16 + FXSYS_HexCharToInt(str[i]);
       byte_pos++;
       if (byte_pos == 4) {
         result += ch;
diff --git a/core/fpdfapi/font/fpdf_font_cid.cpp b/core/fpdfapi/font/fpdf_font_cid.cpp
index 51e7957909..001e8acd57 100644
--- a/core/fpdfapi/font/fpdf_font_cid.cpp
+++ b/core/fpdfapi/font/fpdf_font_cid.cpp
@@ -441,7 +441,7 @@ uint32_t CPDF_CMapParser::CMap_GetCode(const CFX_ByteStringC& word) {
   pdfium::base::CheckedNumeric<uint32_t> num = 0;
   if (word.GetAt(0) == '<') {
     for (int i = 1; i < word.GetLength() && std::isxdigit(word.GetAt(i)); ++i) {
-      num = num * 16 + FXSYS_toHexDigit(word.GetAt(i));
+      num = num * 16 + FXSYS_HexCharToInt(word.GetAt(i));
       if (!num.IsValid())
         return 0;
     }
@@ -449,7 +449,8 @@ uint32_t CPDF_CMapParser::CMap_GetCode(const CFX_ByteStringC& word) {
   }
 
   for (int i = 0; i < word.GetLength() && std::isdigit(word.GetAt(i)); ++i) {
-    num = num * 10 + FXSYS_toDecimalDigit(static_cast<wchar_t>(word.GetAt(i)));
+    num =
+        num * 10 + FXSYS_DecimalCharToInt(static_cast<wchar_t>(word.GetAt(i)));
     if (!num.IsValid())
       return 0;
   }
@@ -476,7 +477,8 @@ bool CPDF_CMapParser::CMap_GetCodeRange(CMap_CodeRange& range,
   for (i = 0; i < range.m_CharSize; ++i) {
     uint8_t digit1 = first.GetAt(i * 2 + 1);
     uint8_t digit2 = first.GetAt(i * 2 + 2);
-    range.m_Lower[i] = FXSYS_toHexDigit(digit1) * 16 + FXSYS_toHexDigit(digit2);
+    range.m_Lower[i] =
+        FXSYS_HexCharToInt(digit1) * 16 + FXSYS_HexCharToInt(digit2);
   }
 
   uint32_t size = second.GetLength();
@@ -487,7 +489,8 @@ bool CPDF_CMapParser::CMap_GetCodeRange(CMap_CodeRange& range,
     uint8_t digit2 = ((uint32_t)i * 2 + 2 < size)
                          ? second.GetAt((FX_STRSIZE)i * 2 + 2)
                          : '0';
-    range.m_Upper[i] = FXSYS_toHexDigit(digit1) * 16 + FXSYS_toHexDigit(digit2);
+    range.m_Upper[i] =
+        FXSYS_HexCharToInt(digit1) * 16 + FXSYS_HexCharToInt(digit2);
   }
   return true;
 }