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rdtypes
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__init__.py
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_asyncbackend.py
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_asyncio_backend.py
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_curio_backend.py
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_immutable_attr.py
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_immutable_ctx.py
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_trio_backend.py
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asyncbackend.py
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asyncquery.py
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asyncresolver.py
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dnssec.py
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e164.py
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edns.py
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entropy.py
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enum.py
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exception.py
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flags.py
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grange.py
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immutable.py
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inet.py
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ipv4.py
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ipv6.py
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message.py
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name.py
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namedict.py
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node.py
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opcode.py
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py.typed
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query.py
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rcode.py
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rdata.py
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rdataclass.py
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rdataset.py
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rdatatype.py
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renderer.py
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resolver.py
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reversename.py
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rrset.py
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serial.py
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set.py
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tokenizer.py
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transaction.py
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tsig.py
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tsigkeyring.py
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ttl.py
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update.py
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version.py
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versioned.py
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wire.py
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xfr.py
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zone.py
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zonefile.py
15.25
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Code Editor : wire.py
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license import contextlib import struct import dns.exception import dns.name class Parser: def __init__(self, wire, current=0): self.wire = wire self.current = 0 self.end = len(self.wire) if current: self.seek(current) self.furthest = current def remaining(self): return self.end - self.current def get_bytes(self, size): if size > self.remaining(): raise dns.exception.FormError output = self.wire[self.current:self.current + size] self.current += size self.furthest = max(self.furthest, self.current) return output def get_counted_bytes(self, length_size=1): length = int.from_bytes(self.get_bytes(length_size), 'big') return self.get_bytes(length) def get_remaining(self): return self.get_bytes(self.remaining()) def get_uint8(self): return struct.unpack('!B', self.get_bytes(1))[0] def get_uint16(self): return struct.unpack('!H', self.get_bytes(2))[0] def get_uint32(self): return struct.unpack('!I', self.get_bytes(4))[0] def get_uint48(self): return int.from_bytes(self.get_bytes(6), 'big') def get_struct(self, format): return struct.unpack(format, self.get_bytes(struct.calcsize(format))) def get_name(self, origin=None): name = dns.name.from_wire_parser(self) if origin: name = name.relativize(origin) return name def seek(self, where): # Note that seeking to the end is OK! (If you try to read # after such a seek, you'll get an exception as expected.) if where < 0 or where > self.end: raise dns.exception.FormError self.current = where @contextlib.contextmanager def restrict_to(self, size): if size > self.remaining(): raise dns.exception.FormError saved_end = self.end try: self.end = self.current + size yield # We make this check here and not in the finally as we # don't want to raise if we're already raising for some # other reason. if self.current != self.end: raise dns.exception.FormError finally: self.end = saved_end @contextlib.contextmanager def restore_furthest(self): try: yield None finally: self.current = self.furthest
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