mirror of https://github.com/morpheus65535/bazarr
70 lines
2.6 KiB
Python
70 lines
2.6 KiB
Python
# Copyright (C) 2015 Red Hat, Inc.
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# Author: Petr Spacek <pspacek@redhat.com>
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#
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose with or without fee is hereby granted,
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# provided that the above copyright notice and this permission notice
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# appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED 'AS IS' AND RED HAT DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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import binascii
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import dns.rdata
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import dns.immutable
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@dns.immutable.immutable
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class EUIBase(dns.rdata.Rdata):
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"""EUIxx record"""
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# see: rfc7043.txt
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__slots__ = ['eui']
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# define these in subclasses
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# byte_len = 6 # 0123456789ab (in hex)
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# text_len = byte_len * 3 - 1 # 01-23-45-67-89-ab
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def __init__(self, rdclass, rdtype, eui):
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super().__init__(rdclass, rdtype)
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self.eui = self._as_bytes(eui)
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if len(self.eui) != self.byte_len:
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raise dns.exception.FormError('EUI%s rdata has to have %s bytes'
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% (self.byte_len * 8, self.byte_len))
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def to_text(self, origin=None, relativize=True, **kw):
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return dns.rdata._hexify(self.eui, chunksize=2, separator=b'-', **kw)
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@classmethod
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def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True,
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relativize_to=None):
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text = tok.get_string()
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if len(text) != cls.text_len:
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raise dns.exception.SyntaxError(
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'Input text must have %s characters' % cls.text_len)
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for i in range(2, cls.byte_len * 3 - 1, 3):
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if text[i] != '-':
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raise dns.exception.SyntaxError('Dash expected at position %s'
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% i)
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text = text.replace('-', '')
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try:
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data = binascii.unhexlify(text.encode())
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except (ValueError, TypeError) as ex:
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raise dns.exception.SyntaxError('Hex decoding error: %s' % str(ex))
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return cls(rdclass, rdtype, data)
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def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
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file.write(self.eui)
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@classmethod
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def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
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eui = parser.get_bytes(cls.byte_len)
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return cls(rdclass, rdtype, eui)
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