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

core/src/fxcrt/fx_basic_util.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "../../include/fxcrt/fx_basic.h"
-#include "../../include/fxcrt/fx_ext.h"
-
 #if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
 #include <sys/types.h>
 #include <dirent.h>
 #else
 #include <direct.h>
 #endif
-
-#include <cctype>
-
 CFX_PrivateData::~CFX_PrivateData() {
   ClearAll();
 }
 void FX_PRIVATEDATA::FreeData() {
   if (m_pData == NULL) {
     return;
   }
   if (m_bSelfDestruct) {
     delete (CFX_DestructObject*)m_pData;
   } else if (m_pCallback) {
@@ skipping 69 matching lines @@
     int cc = 0, integer = 0;
     const FX_CHAR* str = strc.GetCStr();
     int len = strc.GetLength();
     FX_BOOL bNegative = FALSE;
     if (str[0] == '+') {
       cc++;
     } else if (str[0] == '-') {
       bNegative = TRUE;
       cc++;
     }
-    while (cc < len && std::isdigit(str[cc])) {
-      integer = integer * 10 + FXSYS_toDecimalDigit(str[cc]);
-      if (integer < 0)
+    while (cc < len) {
+      if (str[cc] < '0' || str[cc] > '9') {
         break;
-
+      }
+      integer = integer * 10 + str[cc] - '0';
+      if (integer < 0) {
+        break;
+      }
       cc++;
     }
     if (bNegative) {
       integer = -integer;
     }
     *(int*)pData = integer;
   } else {
     bInteger = FALSE;
     *(FX_FLOAT*)pData = FX_atof(strc);
   }
@@ skipping 16 matching lines @@
     if (str[cc] != '+' && str[cc] != '-') {
       break;
     }
     cc++;
   }
   FX_FLOAT value = 0;
   while (cc < len) {
     if (str[cc] == '.') {
       break;
     }
-    value = value * 10 + FXSYS_toDecimalDigit(str[cc]);
+    value = value * 10 + str[cc] - '0';
     cc++;
   }
   static const FX_FLOAT fraction_scales[] = {
       0.1f,         0.01f,         0.001f,        0.0001f,
       0.00001f,     0.000001f,     0.0000001f,    0.00000001f,
       0.000000001f, 0.0000000001f, 0.00000000001f};
   int scale = 0;
   if (cc < len && str[cc] == '.') {
     cc++;
     while (cc < len) {
-      value += fraction_scales[scale] * FXSYS_toDecimalDigit(str[cc]);
+      value += fraction_scales[scale] * (str[cc] - '0');
       scale++;
       if (scale == sizeof fraction_scales / sizeof(FX_FLOAT)) {
         break;
       }
       cc++;
     }
   }
   return bNegative ? -value : value;
 }
 
@@ skipping 195 matching lines @@
       d * m.b + e * m.e + f * m.h, d * m.c + e * m.f + f * m.i,
       g * m.a + h * m.d + i * m.g, g * m.b + h * m.e + i * m.h,
       g * m.c + h * m.f + i * m.i);
 }
 
 CFX_Vector_3by1 CFX_Matrix_3by3::TransformVector(const CFX_Vector_3by1& v) {
   return CFX_Vector_3by1(a * v.a + b * v.b + c * v.c,
                          d * v.a + e * v.b + f * v.c,
                          g * v.a + h * v.b + i * v.c);
 }