1 files changed, 105 insertions, 0 deletions
diff --git a/third_party/dnspython/dns/rdtypes/mxbase.py b/third_party/dnspython/dns/rdtypes/mxbase.py
new file mode 100644
index 0000000000..abc6a9ed5b
--- /dev/null
+++ b/third_party/dnspython/dns/rdtypes/mxbase.py
@@ -0,0 +1,105 @@
+# Copyright (C) 2003-2007, 2009-2011 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.
+
+"""MX-like base classes."""
+
+import cStringIO
+import struct
+
+import dns.exception
+import dns.rdata
+import dns.name
+
+class MXBase(dns.rdata.Rdata):
+    """Base class for rdata that is like an MX record.
+
+    @ivar preference: the preference value
+    @type preference: int
+    @ivar exchange: the exchange name
+    @type exchange: dns.name.Name object"""
+
+    __slots__ = ['preference', 'exchange']
+
+    def __init__(self, rdclass, rdtype, preference, exchange):
+        super(MXBase, self).__init__(rdclass, rdtype)
+        self.preference = preference
+        self.exchange = exchange
+
+    def to_text(self, origin=None, relativize=True, **kw):
+        exchange = self.exchange.choose_relativity(origin, relativize)
+        return '%d %s' % (self.preference, exchange)
+
+    def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
+        preference = tok.get_uint16()
+        exchange = tok.get_name()
+        exchange = exchange.choose_relativity(origin, relativize)
+        tok.get_eol()
+        return cls(rdclass, rdtype, preference, exchange)
+
+    from_text = classmethod(from_text)
+
+    def to_wire(self, file, compress = None, origin = None):
+        pref = struct.pack("!H", self.preference)
+        file.write(pref)
+        self.exchange.to_wire(file, compress, origin)
+
+    def to_digestable(self, origin = None):
+        return struct.pack("!H", self.preference) + \
+            self.exchange.to_digestable(origin)
+
+    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
+        (preference, ) = struct.unpack('!H', wire[current : current + 2])
+        current += 2
+        rdlen -= 2
+        (exchange, cused) = dns.name.from_wire(wire[: current + rdlen],
+                                               current)
+        if cused != rdlen:
+            raise dns.exception.FormError
+        if not origin is None:
+            exchange = exchange.relativize(origin)
+        return cls(rdclass, rdtype, preference, exchange)
+
+    from_wire = classmethod(from_wire)
+
+    def choose_relativity(self, origin = None, relativize = True):
+        self.exchange = self.exchange.choose_relativity(origin, relativize)
+
+    def _cmp(self, other):
+        sp = struct.pack("!H", self.preference)
+        op = struct.pack("!H", other.preference)
+        v = cmp(sp, op)
+        if v == 0:
+            v = cmp(self.exchange, other.exchange)
+        return v
+
+class UncompressedMX(MXBase):
+    """Base class for rdata that is like an MX record, but whose name
+    is not compressed when converted to DNS wire format, and whose
+    digestable form is not downcased."""
+
+    def to_wire(self, file, compress = None, origin = None):
+        super(UncompressedMX, self).to_wire(file, None, origin)
+
+    def to_digestable(self, origin = None):
+        f = cStringIO.StringIO()
+        self.to_wire(f, None, origin)
+        return f.getvalue()
+
+class UncompressedDowncasingMX(MXBase):
+    """Base class for rdata that is like an MX record, but whose name
+    is not compressed when convert to DNS wire format."""
+
+    def to_wire(self, file, compress = None, origin = None):
+        super(UncompressedDowncasingMX, self).to_wire(file, None, origin)