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diff --git a/mpfr/set_str_raw.c b/mpfr/set_str_raw.c
new file mode 100644
index 00000000..e1b3776b
--- /dev/null
+++ b/mpfr/set_str_raw.c
@@ -0,0 +1,55 @@
+/* mpfr_set_str_binary -- set a floating-point number from a binary string
+
+Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+Contributed by the Arenaire and Cacao projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU MPFR Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or (at your
+option) any later version.
+
+The GNU MPFR Library 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 Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MPFR Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+MA 02110-1301, USA. */
+
+#include "mpfr-impl.h"
+
+/* Currently the number should be of the form +/- xxxx.xxxxxxEyy, with
+   decimal exponent. The mantissa of x is supposed to be large enough
+   to hold all the bits of str. */
+
+void
+mpfr_set_str_binary (mpfr_ptr x, const char *str)
+{
+  int has_sign;
+  int res;
+
+  if (*str == 'N')
+    {
+      MPFR_SET_NAN(x);
+      __gmpfr_flags |= MPFR_FLAGS_NAN;
+      return;
+    }
+
+  has_sign = *str == '-' || *str == '+';
+  if (str[has_sign] == 'I')
+    {
+      MPFR_SET_INF(x);
+      if (*str == '-')
+        MPFR_SET_NEG(x);
+      else
+        MPFR_SET_POS(x);
+      return;
+    }
+
+  res = mpfr_strtofr (x, str, 0, 2, GMP_RNDZ);
+  MPFR_ASSERTN (res == 0);
+}