Use some FXSYS methods instead of duplicating

core/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 "core/fxcrt/include/fx_basic.h"
 #include "core/fxcrt/include/fx_ext.h"
 
 #if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
@@ skipping 29 matching lines @@
     if (bNegative) {
       integer = -integer;
     }
     *(int*)pData = integer.ValueOrDefault(0);
   } else {
     bInteger = FALSE;
     *(FX_FLOAT*)pData = FX_atof(strc);
   }
 }
 
+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 FXSYS_FractionalScaleCount() {
+  return FX_ArraySize(fraction_scales);
+}
+
+FX_FLOAT FXSYS_FractionalScale(size_t scale_factor, int value) {
+  return fraction_scales[scale_factor] * value;
+}
+
 FX_FLOAT FX_atof(const CFX_ByteStringC& strc) {
   if (strc.IsEmpty())
     return 0.0;
 
   int cc = 0;
   bool bNegative = false;
   int len = strc.GetLength();
   if (strc[0] == '+') {
     cc++;
   } else if (strc[0] == '-') {
     bNegative = TRUE;
     cc++;
   }
   while (cc < len) {
     if (strc[cc] != '+' && strc[cc] != '-') {
       break;
     }
     cc++;
   }
   FX_FLOAT value = 0;
   while (cc < len) {
     if (strc[cc] == '.') {
       break;
     }
     value = value * 10 + FXSYS_toDecimalDigit(strc.CharAt(cc));
     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 && strc[cc] == '.') {
     cc++;
     while (cc < len) {
-      value += fraction_scales[scale] * FXSYS_toDecimalDigit(strc.CharAt(cc));
+      value +=
+          FXSYS_FractionalScale(scale, FXSYS_toDecimalDigit(strc.CharAt(cc)));
       scale++;
-      if (scale == FX_ArraySize(fraction_scales))
+      if (scale == FXSYS_FractionalScaleCount())
         break;
       cc++;
     }
   }
   return bNegative ? -value : value;
 }
 
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_ && _MSC_VER < 1900
 void FXSYS_snprintf(char* str,
                     size_t size,
@@ skipping 194 matching lines @@
     dstShift -= 8;
     result |= *dataPtr++ << dstShift;
   }
   if (dstShift > 0) {
     bitShift = 8 - dstShift;
     bitMask = (1 << dstShift) - 1;
     result |= *dataPtr++ >> bitShift & bitMask;
   }
   return result;
 }