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

This reverts commit e0e922db5fb77df9a5a9cc802096f484ed21da1c.

Broke Windows build.

FAILED: ninja -t msvc -e environment.x86 -- "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\amd64_x86\cl.exe" /nologo /showIncludes /FC @obj\core\src\fxcrt\fxcrt.fx_basic_gcc.obj.rsp /c ..\..\core\src\fxcrt\fx_basic_gcc.cpp /Foobj\core\src\fxcrt\fxcrt.fx_basic_gcc.obj /Fdobj\fxcrt.cc.pdb
e:\b\build\slave\windows\build\pdfium\core\src\fxcrt\fx_basic_gcc.cpp(28) : error C2220: warning treated as error - no 'object' file generated
        e:\b\build\slave\windows\build\pdfium\core\src\fxcrt\fx_basic_gcc.cpp(75) : see reference to function template instantiation 'T FXSYS_StrToInt<int32_t,const FX_WCHAR*>(STR_T)' being compiled
        with
        [
            T=int32_t
,            STR_T=const FX_WCHAR *
        ]
e:\b\build\slave\windows\build\pdfium\core\src\fxcrt\fx_basic_gcc.cpp(28) : warning C4244: 'argument' : conversion from 'const FX_WCHAR' to 'char', possible loss of data
FAILED: ninja -t msvc -e environment.x86 -- "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\amd64_x86\cl.exe" /nologo /showIncludes /FC @obj\core\src\fpdftext\fpdftext.fpdf_text.obj.rsp /c ..\..\core\src\fpdftext\fpdf_text.cpp /Foobj\core\src\fpdftext\fpdftext.fpdf_text.obj /Fdobj\fpdftext.cc.pdb
e:\b\build\slave\windows\build\pdfium\core\src\fpdftext\fpdf_text.cpp(439) : error C2039: 'isdigit' : is not a member of 'std'
FAILED: ninja -t msvc -e environment.x86 -- "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\amd64_x86\cl.exe" /nologo /showIncludes /FC @obj\core\src\fxcrt\fxcrt.fx_basic_wstring.obj.rsp /c ..\..\core\src\fxcrt\fx_basic_wstring.cpp /Foobj\core\src\fxcrt\fxcrt.fx_basic_wstring.obj /Fdobj\fxcrt.cc.pdb
e:\b\build\slave\windows\build\pdfium\core\src\fxcrt\fx_basic_wstring.cpp(973) : error C2220: warning treated as error - no 'object' file generated
e:\b\build\slave\windows\build\pdfium\core\src\fxcrt\fx_basic_wstring.cpp(973) : warning C4244: 'argument' : conversion from 'const FX_WCHAR' to 'char', possible loss of data
e:\b\build\slave\windows\build\pdfium\core\src\fxcrt\fx_basic_wstring.cpp(981) : warning C4244: 'argument' : conversion from 'const FX_WCHAR' to 'char', possible loss of data
FAILED: ninja -t msvc -e environment.x86 -- "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\amd64_x86\cl.exe" /nologo /showIncludes /FC @obj\core\src\fpdftext\fpdftext.fpdf_text_int.obj.rsp /c ..\..\core\src\fpdftext\fpdf_text_int.cpp /Foobj\core\src\fpdftext\fpdftext.fpdf_text_int.obj /Fdobj\fpdftext.cc.pdb
e:\b\build\slave\windows\build\pdfium\core\src\fpdftext\fpdf_text_int.cpp(2436) : error C2039: 'isdigit' : is not a member of 'std'
e:\b\build\slave\windows\build\pdfium\core\src\fpdftext\fpdf_text_int.cpp(2440) : error C2039: 'isdigit' : is not a member of 'std'
ninja: build stopped: subcommand failed.

TBR=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1431683008 .

1 files changed, 13 insertions, 4 deletions

diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_utility.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_utility.cpp
index 202f02ac77..335101e85b 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_utility.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_utility.cpp
@@ -5,7 +5,6 @@
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "../../../include/fpdfapi/fpdf_parser.h"
-#include "../../../include/fxcrt/fx_ext.h"
 
 // Indexed by 8-bit character code, contains either:
 //   'W' - for whitespace: NUL, TAB, CR, LF, FF, 0x80, 0xff
@@ -280,7 +279,18 @@ FX_BOOL CPDF_SimpleParser::FindTagParam(const CFX_ByteStringC& token,
   }
   return FALSE;
 }
-
+static int _hex2dec(char ch) {
+  if (ch >= '0' && ch <= '9') {
+    return ch - '0';
+  }
+  if (ch >= 'a' && ch <= 'f') {
+    return ch - 'a' + 10;
+  }
+  if (ch >= 'A' && ch <= 'F') {
+    return ch - 'A' + 10;
+  }
+  return 0;
+}
 CFX_ByteString PDF_NameDecode(const CFX_ByteStringC& bstr) {
   int size = bstr.GetLength();
   const FX_CHAR* pSrc = bstr.GetCStr();
@@ -292,8 +302,7 @@ CFX_ByteString PDF_NameDecode(const CFX_ByteStringC& bstr) {
   FX_CHAR* pDest = pDestStart;
   for (int i = 0; i < size; i++) {
     if (pSrc[i] == '#' && i < size - 2) {
-      *pDest++ =
-          FXSYS_toHexDigit(pSrc[i + 1]) * 16 + FXSYS_toHexDigit(pSrc[i + 2]);
+      *pDest++ = _hex2dec(pSrc[i + 1]) * 16 + _hex2dec(pSrc[i + 2]);
       i += 2;
     } else {
       *pDest++ = pSrc[i];