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File txtbase.py

# Copyright (C) 2006, 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.

"""TXT-like base class."""

import struct

import dns.exception
import dns.rdata
import dns.tokenizer
from dns._compat import binary_type

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

@classmethod
    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")
            value = token.value
            if isinstance(value, binary_type):
                strings.append(value)
            else:
                strings.append(value.encode())
        if len(strings) == 0:
            raise dns.exception.UnexpectedEnd
        return cls(rdclass, rdtype, strings)

def to_wire(self, file, compress=None, origin=None):
        for s in self.strings:
            l = len(s)
            assert l < 256
            file.write(struct.pack('!B', l))
            file.write(s)

@classmethod
    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
        strings = []
        while rdlen > 0:
            l = wire[current]
            current += 1
            rdlen -= 1
            if l > rdlen:
                raise dns.exception.FormError
            s = wire[current: current + l].unwrap()
            current += l
            rdlen -= l
            strings.append(s)
        return cls(rdclass, rdtype, strings)

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-03-20 04:31:26
..	DIR	-	drwxr-xr-x	2025-03-20 04:31:26
ANY	DIR	-	drwxr-xr-x	2025-03-20 04:31:26
IN	DIR	-	drwxr-xr-x	2025-03-20 04:31:26
__pycache__	DIR	-	drwxr-xr-x	2025-03-20 04:31:26
__init__.py	text/plain	895 B	-rw-r--r--	2016-09-20 04:24:02
dnskeybase.py	text/x-script.python	4.28 KB	-rw-r--r--	2016-09-20 04:24:02
dsbase.py	text/x-script.python	3.01 KB	-rw-r--r--	2016-09-20 04:24:02
euibase.py	text/x-script.python	2.71 KB	-rw-r--r--	2016-09-20 04:24:02
mxbase.py	text/x-script.python	3.57 KB	-rw-r--r--	2016-09-20 04:24:02
nsbase.py	text/x-script.python	2.78 KB	-rw-r--r--	2016-09-20 04:24:02
txtbase.py	text/x-script.python	2.97 KB	-rw-r--r--	2016-09-20 04:24:02

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