s4-python: Move dnspython to lib/, like the other Python modules

[samba.git] / lib / dnspython / dns / rdtypes / txtbase.py

diff --git a/lib/dnspython/dns/rdtypes/txtbase.py b/lib/dnspython/dns/rdtypes/txtbase.py
new file mode 100644 (file)
index 0000000..43db2a4
--- /dev/null
+++ b/lib/dnspython/dns/rdtypes/txtbase.py
@@ -0,0 +1,87 @@
+# Copyright (C) 2006, 2007, 2009, 2010 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.
+
+"""TXT-like base class."""
+
+import dns.exception
+import dns.rdata
+import dns.tokenizer
+
+class TXTBase(dns.rdata.Rdata):
+    """Base class for rdata that is like a TXT record
+
+    @ivar strings: the text strings
+    @type strings: list of string
+    @see: RFC 1035"""
+
+    __slots__ = ['strings']
+
+    def __init__(self, rdclass, rdtype, strings):
+        super(TXTBase, self).__init__(rdclass, rdtype)
+        if isinstance(strings, str):
+            strings = [ strings ]
+        self.strings = strings[:]
+
+    def to_text(self, origin=None, relativize=True, **kw):
+        txt = ''
+        prefix = ''
+        for s in self.strings:
+            txt += '%s"%s"' % (prefix, dns.rdata._escapify(s))
+            prefix = ' '
+        return txt
+
+    def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
+        strings = []
+        while 1:
+            token = tok.get().unescape()
+            if token.is_eol_or_eof():
+                break
+            if not (token.is_quoted_string() or token.is_identifier()):
+                raise dns.exception.SyntaxError("expected a string")
+            if len(token.value) > 255:
+                raise dns.exception.SyntaxError("string too long")
+            strings.append(token.value)
+        if len(strings) == 0:
+            raise dns.exception.UnexpectedEnd
+        return cls(rdclass, rdtype, strings)
+
+    from_text = classmethod(from_text)
+
+    def to_wire(self, file, compress = None, origin = None):
+        for s in self.strings:
+            l = len(s)
+            assert l < 256
+            byte = chr(l)
+            file.write(byte)
+            file.write(s)
+
+    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
+        strings = []
+        while rdlen > 0:
+            l = ord(wire[current])
+            current += 1
+            rdlen -= 1
+            if l > rdlen:
+                raise dns.exception.FormError
+            s = wire[current : current + l]
+            current += l
+            rdlen -= l
+            strings.append(s)
+        return cls(rdclass, rdtype, strings)
+
+    from_wire = classmethod(from_wire)
+
+    def _cmp(self, other):
+        return cmp(self.strings, other.strings)