PyNDN: Initial import of PyNDN code
Refs #1010 (http://redmine.named-data.net/issues/1010)
diff --git a/PyNDN/impl/segmenting.py b/PyNDN/impl/segmenting.py
new file mode 100644
index 0000000..fb2d253
--- /dev/null
+++ b/PyNDN/impl/segmenting.py
@@ -0,0 +1,55 @@
+## -*- Mode: python; py-indent-offset: 4; indent-tabs-mode: nil; coding: utf-8; -*-
+#
+# Copyright (c) 2011-2013, Regents of the University of California
+# Alexander Afanasyev
+#
+# GNU 3.0 license, See the LICENSE file for more information
+#
+# Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+#
+
+#
+# Based on PyCCN code, copyrighted and licensed as follows
+#
+# Copyright (c) 2011-2013, Regents of the University of California
+# BSD license, See the COPYING file for more information
+# Written by: Derek Kulinski <takeda@takeda.tk>
+# Jeff Burke <jburke@ucla.edu>
+#
+
+import math
+import ndn
+
+class Wrapper(object):
+ def __init__(self, name, key):
+ self.name = name
+ self.key = key
+
+ kl = ndn.KeyLocator(key)
+ self.signed_info = ndn.SignedInfo(key_locator = kl, key_digest = key.publicKeyID)
+
+ def __call__(self, chunk, segment, segments):
+ name = self.name + ndn.Name.num2seg(segment)
+ self.signed_info.finalBlockID = ndn.Name.num2seg(segments - 1)
+
+ co = ndn.ContentObject(name = name, content = chunk, signed_info = self.signed_info)
+ co.sign(self.key)
+
+ return co
+
+def segmenter(data, wrapper = None, chunk_size = 4096):
+ segment = 0
+ segments = math.ceil(len(data) / float(chunk_size))
+
+ while segment < segments:
+ start = segment * chunk_size
+ end = min(start + chunk_size, len(data))
+ chunk = data[start : end]
+
+ if wrapper is not None:
+ chunk = wrapper(chunk, segment, segments)
+
+ yield chunk
+
+ segment += 1
+