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Index: mpi-1.8.6/mpi.c
===================================================================
--- mpi-1.8.6.orig/mpi.c 2012-03-20 22:20:10.242815758 -0700
+++ mpi-1.8.6/mpi.c 2012-03-21 06:48:36.401050757 -0700
@@ -14,6 +14,7 @@
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
+#include <math.h>
typedef unsigned char mem_t;
extern mem_t *chk_malloc(size_t size);
@@ -2329,6 +2330,29 @@
/* }}} */
+mp_err mp_to_double(mp_int *mp, double *d)
+{
+ int ix;
+ mp_size used = USED(mp);
+ mp_digit *dp = DIGITS(mp);
+ static double mult;
+ double out = dp[used - 1];
+
+ if (!mult)
+ mult = pow(2.0, MP_DIGIT_BIT);
+
+ for (ix = (int) used - 2; ix >= 0; ix--) {
+ out = out * mult;
+ out += (double) dp[ix];
+ }
+
+ if (SIGN(mp) == MP_NEG)
+ out = -out;
+
+ *d = out;
+ return MP_OKAY;
+}
+
/*------------------------------------------------------------------------*/
/* {{{ mp_print(mp, ofp) */
Index: mpi-1.8.6/mpi.h
===================================================================
--- mpi-1.8.6.orig/mpi.h 2012-03-20 22:20:09.994676258 -0700
+++ mpi-1.8.6/mpi.h 2012-03-20 22:20:10.498959758 -0700
@@ -187,6 +187,11 @@
#endif /* end MP_NUMTH */
/*------------------------------------------------------------------------*/
+/* Conversions */
+
+mp_err mp_to_double(mp_int *mp, double *d);
+
+/*------------------------------------------------------------------------*/
/* Input and output */
#if MP_IOFUNC
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