1 files changed, 86 insertions, 0 deletions
diff --git a/lib/erl_interface/src/decode/decode_long.c b/lib/erl_interface/src/decode/decode_long.c
new file mode 100644
index 0000000000..b4138247e0
--- /dev/null
+++ b/lib/erl_interface/src/decode/decode_long.c
@@ -0,0 +1,86 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 1998-2009. 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"
+
+#ifndef EI_64BIT
+int ei_decode_long(const char *buf, int *index, long *p)
+{
+    const char *s = buf + *index;
+    const char *s0 = s;
+    long n;
+    int arity;
+
+    switch (get8(s)) {
+    case ERL_SMALL_INTEGER_EXT:
+	n = get8(s);
+	break;
+    
+    case ERL_INTEGER_EXT:
+	n = get32be(s);
+	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;
+	    unsigned long u = 0;
+
+	    /* Little Endian, and n always positive, except for LONG_MIN */
+	    for (i = 0; i < arity; i++) {
+		if (i < 4) {
+		    u |= get8(s) << (i * 8);
+		} else if (get8(s) != 0) {
+		    return -1; /* All but first byte have to be 0 */
+		}
+	    }
+
+	    /* check for overflow */
+	    if (sign) {
+		if (u > 0x80000000UL) {
+		    return -1;
+		}
+		n = -((long)u);
+	    } else {
+		if (u > 0x7FFFFFFF) {
+		    return -1;
+		}
+		n = (long)u;
+	    }
+	}
+	break;
+
+    default:
+	return -1;
+    }
+
+    if (p) *p = n;
+    *index += s-s0;
+  
+    return 0; 
+}
+#endif /* !EI_64BIT */