Give a couple of char to int functions better names.chromium/3090

- FXSYS_toDecimalDigit() becomes FXSYS_DecimalCharToInt().
- FXSYS_toHexDigit() becomes FXSYS_HexCharToInt().

Change-Id: If4683e8f85f05124b92ff075056cbc295442087d
Reviewed-on: https://pdfium-review.googlesource.com/4930
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

7 files changed, 30 insertions, 27 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;
 }
diff --git a/core/fpdfapi/page/cpdf_streamparser.cpp b/core/fpdfapi/page/cpdf_streamparser.cpp
index 76b58c9f4a..e8116cf980 100644
--- a/core/fpdfapi/page/cpdf_streamparser.cpp
+++ b/core/fpdfapi/page/cpdf_streamparser.cpp
@@ -500,7 +500,7 @@ CFX_ByteString CPDF_StreamParser::ReadString() {
         break;
       case 1:
         if (ch >= '0' && ch <= '7') {
-          iEscCode = FXSYS_toDecimalDigit(static_cast<wchar_t>(ch));
+          iEscCode = FXSYS_DecimalCharToInt(static_cast<char>(ch));
           status = 2;
           break;
         }
@@ -526,7 +526,7 @@ CFX_ByteString CPDF_StreamParser::ReadString() {
       case 2:
         if (ch >= '0' && ch <= '7') {
           iEscCode =
-              iEscCode * 8 + FXSYS_toDecimalDigit(static_cast<wchar_t>(ch));
+              iEscCode * 8 + FXSYS_DecimalCharToInt(static_cast<char>(ch));
           status = 3;
         } else {
           buf.AppendChar(iEscCode);
@@ -537,7 +537,7 @@ CFX_ByteString CPDF_StreamParser::ReadString() {
       case 3:
         if (ch >= '0' && ch <= '7') {
           iEscCode =
-              iEscCode * 8 + FXSYS_toDecimalDigit(static_cast<wchar_t>(ch));
+              iEscCode * 8 + FXSYS_DecimalCharToInt(static_cast<char>(ch));
           buf.AppendChar(iEscCode);
           status = 0;
         } else {
@@ -583,7 +583,7 @@ CFX_ByteString CPDF_StreamParser::ReadHexString() {
     if (!std::isxdigit(ch))
       continue;
 
-    int val = FXSYS_toHexDigit(ch);
+    int val = FXSYS_HexCharToInt(ch);
     if (bFirst) {
       code = val * 16;
     } else {
diff --git a/core/fpdfapi/parser/cpdf_parser.cpp b/core/fpdfapi/parser/cpdf_parser.cpp
index 12ec81bc07..a3e5dba40a 100644
--- a/core/fpdfapi/parser/cpdf_parser.cpp
+++ b/core/fpdfapi/parser/cpdf_parser.cpp
@@ -144,13 +144,13 @@ CPDF_Parser::Error CPDF_Parser::StartParse(
     return FORMAT_ERROR;
 
   if (std::isdigit(ch))
-    m_FileVersion = FXSYS_toDecimalDigit(static_cast<wchar_t>(ch)) * 10;
+    m_FileVersion = FXSYS_DecimalCharToInt(static_cast<wchar_t>(ch)) * 10;
 
   if (!m_pSyntax->GetCharAt(7, ch))
     return FORMAT_ERROR;
 
   if (std::isdigit(ch))
-    m_FileVersion += FXSYS_toDecimalDigit(static_cast<wchar_t>(ch));
+    m_FileVersion += FXSYS_DecimalCharToInt(static_cast<wchar_t>(ch));
 
   if (m_pSyntax->m_FileLen < m_pSyntax->m_HeaderOffset + 9)
     return FORMAT_ERROR;
@@ -623,7 +623,7 @@ bool CPDF_Parser::RebuildCrossRef() {
           if (std::isdigit(byte)) {
             start_pos = pos + i;
             state = ParserState::kObjNum;
-            objnum = FXSYS_toDecimalDigit(static_cast<wchar_t>(byte));
+            objnum = FXSYS_DecimalCharToInt(static_cast<wchar_t>(byte));
           } else if (byte == 't') {
             state = ParserState::kTrailer;
             inside_index = 1;
@@ -638,8 +638,8 @@ bool CPDF_Parser::RebuildCrossRef() {
 
         case ParserState::kObjNum:
           if (std::isdigit(byte)) {
-            objnum =
-                objnum * 10 + FXSYS_toDecimalDigit(static_cast<wchar_t>(byte));
+            objnum = objnum * 10 +
+                     FXSYS_DecimalCharToInt(static_cast<wchar_t>(byte));
           } else if (PDFCharIsWhitespace(byte)) {
             state = ParserState::kPostObjNum;
           } else {
@@ -653,7 +653,7 @@ bool CPDF_Parser::RebuildCrossRef() {
           if (std::isdigit(byte)) {
             start_pos1 = pos + i;
             state = ParserState::kGenNum;
-            gennum = FXSYS_toDecimalDigit(static_cast<wchar_t>(byte));
+            gennum = FXSYS_DecimalCharToInt(static_cast<wchar_t>(byte));
           } else if (byte == 't') {
             state = ParserState::kTrailer;
             inside_index = 1;
@@ -665,8 +665,8 @@ bool CPDF_Parser::RebuildCrossRef() {
 
         case ParserState::kGenNum:
           if (std::isdigit(byte)) {
-            gennum =
-                gennum * 10 + FXSYS_toDecimalDigit(static_cast<wchar_t>(byte));
+            gennum = gennum * 10 +
+                     FXSYS_DecimalCharToInt(static_cast<wchar_t>(byte));
           } else if (PDFCharIsWhitespace(byte)) {
             state = ParserState::kPostGenNum;
           } else {
@@ -681,7 +681,7 @@ bool CPDF_Parser::RebuildCrossRef() {
             inside_index = 1;
           } else if (std::isdigit(byte)) {
             objnum = gennum;
-            gennum = FXSYS_toDecimalDigit(static_cast<wchar_t>(byte));
+            gennum = FXSYS_DecimalCharToInt(static_cast<wchar_t>(byte));
             start_pos = start_pos1;
             start_pos1 = pos + i;
             state = ParserState::kGenNum;
diff --git a/core/fpdfapi/parser/cpdf_syntax_parser.cpp b/core/fpdfapi/parser/cpdf_syntax_parser.cpp
index e41736dd86..5da696e574 100644
--- a/core/fpdfapi/parser/cpdf_syntax_parser.cpp
+++ b/core/fpdfapi/parser/cpdf_syntax_parser.cpp
@@ -225,7 +225,7 @@ CFX_ByteString CPDF_SyntaxParser::ReadString() {
         break;
       case ReadStatus::Backslash:
         if (ch >= '0' && ch <= '7') {
-          iEscCode = FXSYS_toDecimalDigit(static_cast<wchar_t>(ch));
+          iEscCode = FXSYS_DecimalCharToInt(static_cast<wchar_t>(ch));
           status = ReadStatus::Octal;
           break;
         }
@@ -251,7 +251,7 @@ CFX_ByteString CPDF_SyntaxParser::ReadString() {
       case ReadStatus::Octal:
         if (ch >= '0' && ch <= '7') {
           iEscCode =
-              iEscCode * 8 + FXSYS_toDecimalDigit(static_cast<wchar_t>(ch));
+              iEscCode * 8 + FXSYS_DecimalCharToInt(static_cast<wchar_t>(ch));
           status = ReadStatus::FinishOctal;
         } else {
           buf.AppendChar(iEscCode);
@@ -263,7 +263,7 @@ CFX_ByteString CPDF_SyntaxParser::ReadString() {
         status = ReadStatus::Normal;
         if (ch >= '0' && ch <= '7') {
           iEscCode =
-              iEscCode * 8 + FXSYS_toDecimalDigit(static_cast<wchar_t>(ch));
+              iEscCode * 8 + FXSYS_DecimalCharToInt(static_cast<wchar_t>(ch));
           buf.AppendChar(iEscCode);
         } else {
           buf.AppendChar(iEscCode);
@@ -298,7 +298,7 @@ CFX_ByteString CPDF_SyntaxParser::ReadHexString() {
       break;
 
     if (std::isxdigit(ch)) {
-      int val = FXSYS_toHexDigit(ch);
+      int val = FXSYS_HexCharToInt(ch);
       if (bFirst) {
         code = val * 16;
       } else {
diff --git a/core/fpdfapi/parser/fpdf_parser_decode.cpp b/core/fpdfapi/parser/fpdf_parser_decode.cpp
index 306e6fe3ac..c521c20665 100644
--- a/core/fpdfapi/parser/fpdf_parser_decode.cpp
+++ b/core/fpdfapi/parser/fpdf_parser_decode.cpp
@@ -174,7 +174,7 @@ uint32_t HexDecode(const uint8_t* src_buf,
     if (!std::isxdigit(ch))
       continue;
 
-    int digit = FXSYS_toHexDigit(ch);
+    int digit = FXSYS_HexCharToInt(ch);
     if (bFirst)
       dest_buf[dest_size] = digit * 16;
     else
diff --git a/core/fpdfapi/parser/fpdf_parser_utility.cpp b/core/fpdfapi/parser/fpdf_parser_utility.cpp
index d953d4c3e8..1edf577c5b 100644
--- a/core/fpdfapi/parser/fpdf_parser_utility.cpp
+++ b/core/fpdfapi/parser/fpdf_parser_utility.cpp
@@ -97,8 +97,8 @@ CFX_ByteString PDF_NameDecode(const CFX_ByteStringC& bstr) {
   char* pDest = pDestStart;
   for (int i = 0; i < size; i++) {
     if (bstr[i] == '#' && i < size - 2) {
-      *pDest++ =
-          FXSYS_toHexDigit(bstr[i + 1]) * 16 + FXSYS_toHexDigit(bstr[i + 2]);
+      *pDest++ = FXSYS_HexCharToInt(bstr[i + 1]) * 16 +
+                 FXSYS_HexCharToInt(bstr[i + 2]);
       i += 2;
     } else {
       *pDest++ = bstr[i];