From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001
From: Erlang/OTP <otp@erlang.org>
Date: Fri, 20 Nov 2009 14:54:40 +0000
Subject: The R13B03 release.

---
 lib/erl_interface/src/decode/decode_ulonglong.c | 83 +++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 lib/erl_interface/src/decode/decode_ulonglong.c

(limited to 'lib/erl_interface/src/decode/decode_ulonglong.c')

diff --git a/lib/erl_interface/src/decode/decode_ulonglong.c b/lib/erl_interface/src/decode/decode_ulonglong.c
new file mode 100644
index 0000000000..17ecea848d
--- /dev/null
+++ b/lib/erl_interface/src/decode/decode_ulonglong.c
@@ -0,0 +1,83 @@
+/*
+ * %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"
+#include "eiext.h"
+#include "putget.h"
+
+#ifdef EI_64BIT
+int ei_decode_ulong(const char *buf, int *index, unsigned long *p)
+{
+    return ei_decode_ulonglong(buf, index, (EI_ULONGLONG *)p);
+}
+#endif
+
+int ei_decode_ulonglong(const char *buf, int *index, EI_ULONGLONG *p)
+{
+  const char *s = buf + *index;
+  const char *s0 = s;
+  EI_ULONGLONG n;
+  int arity;
+  int sn;
+
+  switch (get8(s)) {
+  case ERL_SMALL_INTEGER_EXT:
+    n = get8(s);
+    break;
+    
+  case ERL_INTEGER_EXT:
+    sn = get32be(s);
+    if (sn < 0) return -1;
+    n = (EI_ULONGLONG)sn;
+    break;
+    
+  case ERL_SMALL_BIG_EXT:
+    arity = get8(s);
+    goto decode_big;
+
+  case ERL_LARGE_BIG_EXT:
+    arity = get32be(s);
+
+  decode_big:
+    {
+      int sign = get8(s);
+      int i;
+      n = 0;
+
+      if (sign) return -1;
+
+      /* Little Endian, up to four bytes always fit into unsigned long */
+      for (i = 0; i < arity; i++) {
+	if (i < 8) {
+	  n |= ((EI_ULONGLONG)get8(s)) << (i * 8);
+	} else if (get8(s) != 0) {
+	  return -1; /* All but first byte have to be 0 */
+	}
+      }
+    }
+    break;
+
+  default:
+    return -1;
+  }
+
+  if (p) *p = n;
+  *index += s-s0;
+  
+  return 0; 
+}
-- 
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