1 files changed, 81 insertions, 0 deletions
diff --git a/lib/erl_interface/src/encode/encode_bignum.c b/lib/erl_interface/src/encode/encode_bignum.c
new file mode 100644
index 0000000000..6850cb86a6
--- /dev/null
+++ b/lib/erl_interface/src/encode/encode_bignum.c
@@ -0,0 +1,81 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 2002-2009. All Rights Reserved.
+ * 
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ * 
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * %CopyrightEnd%
+ */
+
+#include "eidef.h"
+
+#if defined(HAVE_GMP_H) && defined(HAVE_LIBGMP)
+
+#include <gmp.h>
+
+#include "eidef.h"
+#include "eiext.h"
+#include "putget.h"
+#include "ei_x_encode.h"
+
+int ei_encode_bignum(char *buf, int *index, mpz_t obj)
+{
+    char *s = buf + *index;
+    char *s0 = s;
+    size_t count;
+    int mpz_sign = mpz_sgn(obj);
+
+    /*
+     * FIXME we could code into ERL_[SMALL_]INTEGER_EXT but to make
+     * this code simple for now we always code into ERL_SMALL_BIG_EXT
+     */
+
+    if (mpz_sign == 0) {	/* Special case, bignum is zero */
+	if (!buf) s += 2;
+	else {
+	    put8(s,ERL_SMALL_INTEGER_EXT);
+	    put8(s,0);
+	}
+    } else {
+
+	if (!buf) {
+	    int numb = 8;	/* # bits in each external format limb */
+	    s += (mpz_sizeinbase(obj, 2) + numb-1) / numb;
+	} else {
+	    char *arityp;
+
+	    put8(s,ERL_LARGE_BIG_EXT);
+	    arityp = s;		/* fill in later */
+	    s += 4;
+	    put8(s, mpz_sign == 1); /* save sign separately */
+	    mpz_export(s, &count, -1, 1, 0, 0, obj);
+	    s += count;
+	    put32le(arityp, count);
+	}
+    }
+  
+    *index += s-s0; 
+
+    return 0; 
+}
+
+int ei_x_encode_bignum(ei_x_buff* x, mpz_t n)
+{
+    int i = x->index;
+    ei_encode_bignum(NULL, &i, n);
+    if (!x_fix_buff(x, i))
+	return -1;
+    return ei_encode_bignum(x->buff, &x->index, n);
+}
+
+#endif /* HAVE_GMP_H && HAVE_LIBGMP */