Combine StrToInt methods.

This Cl combines the two StrToInt implementations. In doing so I had to add
some more overrides to toDecimalDigit() and add a isDecimalDigit().

BUG=pdfium:423
R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1757283002 .

7 files changed, 48 insertions, 59 deletions

diff --git a/core/src/fpdfapi/fpdf_font/fpdf_font_cid.cpp b/core/src/fpdfapi/fpdf_font/fpdf_font_cid.cpp
index 3cbd67633f..7c85b8213d 100644
--- a/core/src/fpdfapi/fpdf_font/fpdf_font_cid.cpp
+++ b/core/src/fpdfapi/fpdf_font/fpdf_font_cid.cpp
@@ -720,7 +720,7 @@ FX_DWORD 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(word.GetAt(i));
+    num = num * 10 + FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(word.GetAt(i)));
   return num;
 }
 
diff --git a/core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp b/core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp
index 02e3617feb..b49607e743 100644
--- a/core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp
+++ b/core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp
@@ -533,10 +533,11 @@ CFX_ByteString CPDF_StreamParser::ReadString() {
   if (!PositionIsInBounds())
     return CFX_ByteString();
 
-  int ch = m_pBuf[m_Pos++];
+  uint8_t ch = m_pBuf[m_Pos++];
   CFX_ByteTextBuf buf;
   int parlevel = 0;
-  int status = 0, iEscCode = 0;
+  int status = 0;
+  int iEscCode = 0;
   while (1) {
     switch (status) {
       case 0:
@@ -560,7 +561,7 @@ CFX_ByteString CPDF_StreamParser::ReadString() {
         break;
       case 1:
         if (ch >= '0' && ch <= '7') {
-          iEscCode = FXSYS_toDecimalDigit(ch);
+          iEscCode = FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(ch));
           status = 2;
           break;
         }
@@ -585,7 +586,8 @@ CFX_ByteString CPDF_StreamParser::ReadString() {
         break;
       case 2:
         if (ch >= '0' && ch <= '7') {
-          iEscCode = iEscCode * 8 + FXSYS_toDecimalDigit(ch);
+          iEscCode =
+              iEscCode * 8 + FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(ch));
           status = 3;
         } else {
           buf.AppendChar(iEscCode);
@@ -595,7 +597,8 @@ CFX_ByteString CPDF_StreamParser::ReadString() {
         break;
       case 3:
         if (ch >= '0' && ch <= '7') {
-          iEscCode = iEscCode * 8 + FXSYS_toDecimalDigit(ch);
+          iEscCode =
+              iEscCode * 8 + FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(ch));
           buf.AppendChar(iEscCode);
           status = 0;
         } else {
@@ -617,7 +620,7 @@ CFX_ByteString CPDF_StreamParser::ReadString() {
     ch = m_pBuf[m_Pos++];
   }
   if (PositionIsInBounds())
-    ch = m_pBuf[m_Pos++];
+    ++m_Pos;
 
   if (buf.GetLength() > MAX_STRING_LENGTH) {
     return CFX_ByteString(buf.GetBuffer(), MAX_STRING_LENGTH);
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
index 16d1134cb1..737bbe49be 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
@@ -208,12 +208,12 @@ CPDF_Parser::Error CPDF_Parser::StartParse(IFX_FileRead* pFileAccess) {
   if (!m_Syntax.GetCharAt(5, ch))
     return FORMAT_ERROR;
   if (std::isdigit(ch))
-    m_FileVersion = FXSYS_toDecimalDigit(ch) * 10;
+    m_FileVersion = FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(ch)) * 10;
 
   if (!m_Syntax.GetCharAt(7, ch))
     return FORMAT_ERROR;
   if (std::isdigit(ch))
-    m_FileVersion += FXSYS_toDecimalDigit(ch);
+    m_FileVersion += FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(ch));
 
   if (m_Syntax.m_FileLen < m_Syntax.m_HeaderOffset + 9)
     return FORMAT_ERROR;
@@ -669,7 +669,7 @@ FX_BOOL CPDF_Parser::RebuildCrossRef() {
           if (std::isdigit(byte)) {
             start_pos = pos + i;
             state = ParserState::kObjNum;
-            objnum = FXSYS_toDecimalDigit(byte);
+            objnum = FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(byte));
           } else if (byte == 't') {
             state = ParserState::kTrailer;
             inside_index = 1;
@@ -684,7 +684,8 @@ FX_BOOL CPDF_Parser::RebuildCrossRef() {
 
         case ParserState::kObjNum:
           if (std::isdigit(byte)) {
-            objnum = objnum * 10 + FXSYS_toDecimalDigit(byte);
+            objnum =
+                objnum * 10 + FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(byte));
           } else if (PDFCharIsWhitespace(byte)) {
             state = ParserState::kPostObjNum;
           } else {
@@ -698,7 +699,7 @@ FX_BOOL CPDF_Parser::RebuildCrossRef() {
           if (std::isdigit(byte)) {
             start_pos1 = pos + i;
             state = ParserState::kGenNum;
-            gennum = FXSYS_toDecimalDigit(byte);
+            gennum = FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(byte));
           } else if (byte == 't') {
             state = ParserState::kTrailer;
             inside_index = 1;
@@ -710,7 +711,8 @@ FX_BOOL CPDF_Parser::RebuildCrossRef() {
 
         case ParserState::kGenNum:
           if (std::isdigit(byte)) {
-            gennum = gennum * 10 + FXSYS_toDecimalDigit(byte);
+            gennum =
+                gennum * 10 + FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(byte));
           } else if (PDFCharIsWhitespace(byte)) {
             state = ParserState::kPostGenNum;
           } else {
@@ -725,7 +727,7 @@ FX_BOOL CPDF_Parser::RebuildCrossRef() {
             inside_index = 1;
           } else if (std::isdigit(byte)) {
             objnum = gennum;
-            gennum = FXSYS_toDecimalDigit(byte);
+            gennum = FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(byte));
             start_pos = start_pos1;
             start_pos1 = pos + i;
             state = ParserState::kGenNum;
@@ -1876,7 +1878,7 @@ CFX_ByteString CPDF_SyntaxParser::ReadString() {
         break;
       case 1:
         if (ch >= '0' && ch <= '7') {
-          iEscCode = FXSYS_toDecimalDigit(ch);
+          iEscCode = FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(ch));
           status = 2;
           break;
         }
@@ -1901,7 +1903,8 @@ CFX_ByteString CPDF_SyntaxParser::ReadString() {
         break;
       case 2:
         if (ch >= '0' && ch <= '7') {
-          iEscCode = iEscCode * 8 + FXSYS_toDecimalDigit(ch);
+          iEscCode =
+              iEscCode * 8 + FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(ch));
           status = 3;
         } else {
           buf.AppendChar(iEscCode);
@@ -1911,7 +1914,8 @@ CFX_ByteString CPDF_SyntaxParser::ReadString() {
         break;
       case 3:
         if (ch >= '0' && ch <= '7') {
-          iEscCode = iEscCode * 8 + FXSYS_toDecimalDigit(ch);
+          iEscCode =
+              iEscCode * 8 + FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(ch));
           buf.AppendChar(iEscCode);
           status = 0;
         } else {
diff --git a/core/src/fxcrt/fx_basic_gcc.cpp b/core/src/fxcrt/fx_basic_gcc.cpp
index 607f095570..e2ec939e7d 100644
--- a/core/src/fxcrt/fx_basic_gcc.cpp
+++ b/core/src/fxcrt/fx_basic_gcc.cpp
@@ -11,42 +11,19 @@
 #include "core/include/fxcrt/fx_ext.h"
 #include "core/include/fxcrt/fx_string.h"
 
-template <class T>
-T FXSYS_StrToInt(const FX_CHAR* str) {
-  bool neg = false;
+template <typename IntType, typename CharType>
+IntType FXSYS_StrToInt(const CharType* str) {
   if (!str)
     return 0;
 
-  if (std::numeric_limits<T>::is_signed && *str == '-') {
-    neg = true;
+  bool neg = std::numeric_limits<IntType>::is_signed && *str == '-';
+  if (neg)
     str++;
-  }
-  T num = 0;
-  while (*str && std::isdigit(*str)) {
-    T val = FXSYS_toDecimalDigit(*str);
-    if (num > (std::numeric_limits<T>::max() - val) / 10)
-      break;
 
-    num = num * 10 + val;
-    str++;
-  }
-  return neg ? -num : num;
-}
-
-template <class T>
-T FXSYS_StrToInt(const FX_WCHAR* str) {
-  bool neg = false;
-  if (!str)
-    return 0;
-
-  if (std::numeric_limits<T>::is_signed && *str == '-') {
-    neg = true;
-    str++;
-  }
-  T num = 0;
-  while (*str && std::iswdigit(*str)) {
-    T val = FXSYS_toDecimalDigitWide(*str);
-    if (num > (std::numeric_limits<T>::max() - val) / 10)
+  IntType num = 0;
+  while (*str && FXSYS_isDecimalDigit(*str)) {
+    IntType val = FXSYS_toDecimalDigit(*str);
+    if (num > (std::numeric_limits<IntType>::max() - val) / 10)
       break;
 
     num = num * 10 + val;
@@ -93,19 +70,19 @@ STR_T FXSYS_IntToStr(T value, STR_T string, int radix) {
 extern "C" {
 #endif
 int32_t FXSYS_atoi(const FX_CHAR* str) {
-  return FXSYS_StrToInt<int32_t>(str);
+  return FXSYS_StrToInt<int32_t, FX_CHAR>(str);
 }
 uint32_t FXSYS_atoui(const FX_CHAR* str) {
   return FXSYS_StrToInt<uint32_t>(str);
 }
 int32_t FXSYS_wtoi(const FX_WCHAR* str) {
-  return FXSYS_StrToInt<int32_t>(str);
+  return FXSYS_StrToInt<int32_t, FX_WCHAR>(str);
 }
 int64_t FXSYS_atoi64(const FX_CHAR* str) {
-  return FXSYS_StrToInt<int64_t>(str);
+  return FXSYS_StrToInt<int64_t, FX_CHAR>(str);
 }
 int64_t FXSYS_wtoi64(const FX_WCHAR* str) {
-  return FXSYS_StrToInt<int64_t>(str);
+  return FXSYS_StrToInt<int64_t, FX_WCHAR>(str);
 }
 const FX_CHAR* FXSYS_i64toa(int64_t value, FX_CHAR* str, int radix) {
   return FXSYS_IntToStr<int64_t, uint64_t, FX_CHAR*>(value, str, radix);
diff --git a/core/src/fxcrt/fx_basic_wstring.cpp b/core/src/fxcrt/fx_basic_wstring.cpp
index 396dbc4fff..8df72466e8 100644
--- a/core/src/fxcrt/fx_basic_wstring.cpp
+++ b/core/src/fxcrt/fx_basic_wstring.cpp
@@ -994,7 +994,7 @@ FX_FLOAT FX_wtof(const FX_WCHAR* str, int len) {
     if (str[cc] == '.') {
       break;
     }
-    integer = integer * 10 + FXSYS_toDecimalDigitWide(str[cc]);
+    integer = integer * 10 + FXSYS_toDecimalDigit(str[cc]);
     cc++;
   }
   FX_FLOAT fraction = 0;
@@ -1002,7 +1002,7 @@ FX_FLOAT FX_wtof(const FX_WCHAR* str, int len) {
     cc++;
     FX_FLOAT scale = 0.1f;
     while (cc < len) {
-      fraction += scale * FXSYS_toDecimalDigitWide(str[cc]);
+      fraction += scale * FXSYS_toDecimalDigit(str[cc]);
       scale *= 0.1f;
       cc++;
     }
diff --git a/core/src/fxcrt/fx_extension_unittest.cpp b/core/src/fxcrt/fx_extension_unittest.cpp
index b12dcbe07f..e2ae870f93 100644
--- a/core/src/fxcrt/fx_extension_unittest.cpp
+++ b/core/src/fxcrt/fx_extension_unittest.cpp
@@ -16,9 +16,13 @@ TEST(fxcrt, FXSYS_toHexDigit) {
 TEST(fxcrt, FXSYS_toDecimalDigit) {
   EXPECT_EQ(7, FXSYS_toDecimalDigit('7'));
   EXPECT_EQ(0, FXSYS_toDecimalDigit('a'));
+  EXPECT_EQ(7, FXSYS_toDecimalDigit(L'7'));
+  EXPECT_EQ(0, FXSYS_toDecimalDigit(L'a'));
 }
 
-TEST(fxcrt, FXSYS_toDecimalDigitWide) {
-  EXPECT_EQ(7, FXSYS_toDecimalDigitWide(L'7'));
-  EXPECT_EQ(0, FXSYS_toDecimalDigitWide(L'a'));
+TEST(fxcrt, FXSYS_isDecimalDigit) {
+  EXPECT_TRUE(FXSYS_isDecimalDigit('7'));
+  EXPECT_TRUE(FXSYS_isDecimalDigit(L'7'));
+  EXPECT_FALSE(FXSYS_isDecimalDigit('a'));
+  EXPECT_FALSE(FXSYS_isDecimalDigit(L'a'));
 }
diff --git a/core/src/fxcrt/fx_xml_parser.cpp b/core/src/fxcrt/fx_xml_parser.cpp
index ab729eebaf..59c3de444e 100644
--- a/core/src/fxcrt/fx_xml_parser.cpp
+++ b/core/src/fxcrt/fx_xml_parser.cpp
@@ -231,7 +231,7 @@ FX_DWORD CXML_Parser::GetCharRef() {
             break;
           }
           if (g_FXCRT_XML_IsDigital(ch))
-            code = code * 10 + FXSYS_toDecimalDigit(ch);
+            code = code * 10 + FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(ch));
           break;
         case 4:
           m_dwIndex++;
@@ -243,7 +243,8 @@ 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) + FXSYS_toDecimalDigit(ch);
+              code =
+                  (code << 4) + FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(ch));
             } else if (nHex == FXCRTM_XML_CHARTYPE_HexLowerLetter) {
               code = (code << 4) + ch - 87;
             } else {