From 555f6d6e75948601f763d84410cb4148786b0059 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Wed, 22 Apr 2015 19:55:07 -0700
Subject: mpi-to-double patch
* mpi/mpi.c (mp_to_double): New function.
* mpi/mpi.h (mp_to_double): Declared.
---
mpi/mpi.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
(limited to 'mpi/mpi.c')
diff --git a/mpi/mpi.c b/mpi/mpi.c
index 8ea4b1ba..33815a9d 100644
--- a/mpi/mpi.c
+++ b/mpi/mpi.c
@@ -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_calloc(size_t n, size_t size);
@@ -2333,6 +2334,29 @@ X:
/* }}} */
+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) */
--
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