Added missing file

common/math/math_util.cpp

+/*
+ * This program source code file is part of KICAD, a free EDA CAD application.
+ *
+ * Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
+ * Copyright (C) CERN
+ * @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#include <cmath>
+#include <cstdlib>
+#include <climits>
+#include <math/math_util.h>
+
+template<> int rescale( int numerator, int value, int denominator )
+{
+    return (int) ( (int64_t) numerator * (int64_t) value / (int64_t) denominator );
+}
+
+
+template<> int64_t rescale( int64_t numerator, int64_t value, int64_t denominator )
+{
+    int64_t r = 0;
+    int64_t sign = ( ( numerator < 0) ? -1 : 1 ) * ( denominator < 0 ? - 1: 1 ) * (value < 0 ? - 1 : 1);
+
+    int64_t a = std::abs( numerator );
+    int64_t b = std::abs( value );
+    int64_t c = std::abs( denominator );
+
+    r = c / 2;
+
+    if( b <= INT_MAX && c <= INT_MAX )
+    {
+        if( a <= INT_MAX )
+            return sign * ( (a * b + r ) / c );
+        else
+            return sign * (a / c * b + (a % c * b + r) / c);
+    } else {
+        uint64_t a0 = a & 0xFFFFFFFF;
+        uint64_t a1 = a >> 32;
+        uint64_t b0 = b & 0xFFFFFFFF;
+        uint64_t b1 = b >> 32;
+        uint64_t t1 = a0 * b1 + a1 * b0;
+        uint64_t t1a = t1 << 32;
+        int i;
+
+        a0 = a0 * b0 + t1a;
+        a1 = a1 * b1 + (t1 >> 32) + (a0 < t1a);
+        a0 += r;
+        a1 += ((uint64_t)a0) < r;
+
+        for( i = 63; i >= 0; i-- )
+        {
+            a1  += a1 + ( (a0 >> i) & 1 );
+            t1  += t1;
+
+            if( (uint64_t)c <= a1 )
+            {
+                a1 -= c;
+                t1++;
+            }
+        }
+
+        return t1 * sign;
+    }
+}