add missing pyloxi files
diff --git a/src/python/loxi/generic_util.py b/src/python/loxi/generic_util.py
new file mode 100644
index 0000000..6df9565
--- /dev/null
+++ b/src/python/loxi/generic_util.py
@@ -0,0 +1,91 @@
+# Copyright (c) 2008 The Board of Trustees of The Leland Stanford Junior University
+# Copyright (c) 2011, 2012 Open Networking Foundation
+# Copyright (c) 2012, 2013 Big Switch Networks, Inc.
+"""
+Utility functions independent of the protocol version
+"""
+
+# Automatically generated by LOXI from template generic_util.py
+# Do not modify
+
+import loxi
+import struct
+
+def unpack_list(reader, deserializer):
+ """
+ The deserializer function should take an OFReader and return the new object.
+ """
+ entries = []
+ while not reader.is_empty():
+ entries.append(deserializer(reader))
+ return entries
+
+def unpack_list_lv16(reader, deserializer):
+ """
+ The deserializer function should take an OFReader and return the new object.
+ """
+ def wrapper(reader):
+ length, = reader.peek('!H')
+ return deserializer(reader.slice(length))
+ return unpack_list(reader, wrapper)
+
+def unpack_list_tlv16(reader, deserializer):
+ """
+ The deserializer function should take an OFReader and an integer type
+ and return the new object.
+ """
+ def wrapper(reader):
+ typ, length, = reader.peek('!HH')
+ return deserializer(reader.slice(length), typ)
+ return unpack_list(reader, wrapper)
+
+class OFReader(object):
+ """
+ Cursor over a read-only buffer
+
+ OpenFlow messages are best thought of as a sequence of elements of
+ variable size, rather than a C-style struct with fixed offsets and
+ known field lengths. This class supports efficiently reading
+ fields sequentially and is intended to be used recursively by the
+ parsers of child objects which will implicitly update the offset.
+ """
+ def __init__(self, buf):
+ self.buf = buf
+ self.offset = 0
+
+ def read(self, fmt):
+ st = struct.Struct(fmt)
+ if self.offset + st.size > len(self.buf):
+ raise loxi.ProtocolError("Buffer too short")
+ result = st.unpack_from(self.buf, self.offset)
+ self.offset += st.size
+ return result
+
+ def read_all(self):
+ buf = buffer(self.buf, self.offset)
+ self.offset += len(buf)
+ return str(buf)
+
+ def peek(self, fmt):
+ st = struct.Struct(fmt)
+ if self.offset + st.size > len(self.buf):
+ raise loxi.ProtocolError("Buffer too short")
+ result = st.unpack_from(self.buf, self.offset)
+ return result
+
+ def skip(self, length):
+ if self.offset + length > len(self.buf):
+ raise loxi.ProtocolError("Buffer too short")
+ self.offset += length
+
+ def is_empty(self):
+ return self.offset == len(self.buf)
+
+ # Used when parsing variable length objects which have external length
+ # fields (e.g. the actions list in an OF 1.0 packet-out message).
+ def slice(self, length):
+ if self.offset + length > len(self.buf):
+ raise loxi.ProtocolError("Buffer too short")
+ buf = OFReader(buffer(self.buf, self.offset, length))
+ self.offset += length
+ return buf