Import code from previous AssetBuilder version

thirdparty/libtommath/bn_mp_get_int.c

@@ -0,0 +1,42 @@
+#include "tommath_private.h"
+#ifdef BN_MP_GET_INT_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
+/* get the lower 32-bits of an mp_int */
+unsigned long mp_get_int(const mp_int *a)
+{
+   int i;
+   mp_min_u32 res;
+
+   if (a->used == 0) {
+      return 0;
+   }
+
+   /* get number of digits of the lsb we have to read */
+   i = MIN(a->used, ((((int)sizeof(unsigned long) * CHAR_BIT) + DIGIT_BIT - 1) / DIGIT_BIT)) - 1;
+
+   /* get most significant digit of result */
+   res = DIGIT(a, i);
+
+   while (--i >= 0) {
+      res = (res << DIGIT_BIT) | DIGIT(a, i);
+   }
+
+   /* force result to 32-bits always so it is consistent on non 32-bit platforms */
+   return res & 0xFFFFFFFFUL;
+}
+#endif
+
+/* ref:         HEAD -> master, tag: v1.1.0 */
+/* git commit:  08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
+/* commit time: 2019-01-28 20:32:32 +0100 */