The R13B03 release.OTP_R13B03

1 files changed, 75 insertions, 0 deletions

diff --git a/lib/erl_interface/src/decode/decode_bignum.c b/lib/erl_interface/src/decode/decode_bignum.c
new file mode 100644
index 0000000000..f10052f9fe
--- /dev/null
+++ b/lib/erl_interface/src/decode/decode_bignum.c
@@ -0,0 +1,75 @@
+/*
+ * %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"
+
+
+int ei_decode_bignum(const char *buf, int *index, mpz_t obj)
+{
+    const char *s = buf + *index;
+    const char *s0 = s;
+    int arity;
+    int sign;
+    unsigned long n;
+
+    switch (get8(s)) {
+    case ERL_SMALL_INTEGER_EXT:
+	n = get8(s);
+	mpz_set_ui(obj, n);
+	break;
+    
+    case ERL_INTEGER_EXT:
+	n = get32be(s);
+	mpz_set_ui(obj, n);
+	break;
+    
+    case ERL_SMALL_BIG_EXT:
+	arity = get8(s);
+	goto decode_bytes;
+
+    case ERL_LARGE_BIG_EXT:
+	arity = get32be(s);
+    decode_bytes:
+	sign = get8(s);
+	mpz_import(obj, arity, -1, 1, 0, 0, s);
+	s += arity;
+	if (sign) {
+	    mpz_neg(obj, obj);
+	}
+    
+	break;
+    
+    default:
+	return -1;
+    }
+
+    *index += s-s0;
+  
+    return 0; 
+}
+
+#endif /* HAVE_GMP_H && HAVE_LIBGMP */