1 files changed, 59 insertions, 0 deletions
diff --git a/third_party/dnspython/dns/wiredata.py b/third_party/dnspython/dns/wiredata.py
new file mode 100644
index 0000000000..86d954a90a
--- /dev/null
+++ b/third_party/dnspython/dns/wiredata.py
@@ -0,0 +1,59 @@
+# Copyright (C) 2011 Nominum, Inc.
+#
+# Permission to use, copy, modify, and distribute this software and its
+# documentation for any purpose with or without fee is hereby granted,
+# provided that the above copyright notice and this permission notice
+# appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+"""DNS Wire Data Helper"""
+
+import sys
+
+import dns.exception
+
+class WireData(str):
+    # WireData is a string with stricter slicing
+    def __getitem__(self, key):
+        try:
+            return WireData(super(WireData, self).__getitem__(key))
+        except IndexError:
+            raise dns.exception.FormError
+    def __getslice__(self, i, j):
+        try:
+            if j == sys.maxint:
+                # handle the case where the right bound is unspecified
+                j = len(self)
+            if i < 0 or j < 0:
+                raise dns.exception.FormError
+            # If it's not an empty slice, access left and right bounds
+            # to make sure they're valid
+            if i != j:
+                super(WireData, self).__getitem__(i)
+                super(WireData, self).__getitem__(j - 1)
+            return WireData(super(WireData, self).__getslice__(i, j))
+        except IndexError:
+            raise dns.exception.FormError
+    def __iter__(self):
+        i = 0
+        while 1:
+            try:
+                yield self[i]
+                i += 1
+            except dns.exception.FormError:
+                raise StopIteration
+    def unwrap(self):
+        return str(self)
+
+def maybe_wrap(wire):
+    if not isinstance(wire, WireData):
+        return WireData(wire)
+    else:
+        return wire