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#
# This file is part of pyasn1-modules software.
#
# Copyright (c) 2005-2017, Ilya Etingof <etingof@gmail.com>
# License: http://pyasn1.sf.net/license.html
#
# SNMPv2c message syntax
#
# ASN.1 source from:
# http://www.ietf.org/rfc/rfc1902.txt
#
from pyasn1.type import constraint
from pyasn1.type import namedtype
from pyasn1.type import tag
from pyasn1.type import univ


class Integer(univ.Integer):
    subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueRangeConstraint(
        -2147483648, 2147483647
    )


class Integer32(univ.Integer):
    subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueRangeConstraint(
        -2147483648, 2147483647
    )


class OctetString(univ.OctetString):
    subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueSizeConstraint(
        0, 65535
    )


class IpAddress(univ.OctetString):
    tagSet = univ.OctetString.tagSet.tagImplicitly(
        tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x00)
    )
    subtypeSpec = univ.OctetString.subtypeSpec + constraint.ValueSizeConstraint(
        4, 4
    )


class Counter32(univ.Integer):
    tagSet = univ.Integer.tagSet.tagImplicitly(
        tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x01)
    )
    subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueRangeConstraint(
        0, 4294967295
    )


class Gauge32(univ.Integer):
    tagSet = univ.Integer.tagSet.tagImplicitly(
        tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x02)
    )
    subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueRangeConstraint(
        0, 4294967295
    )


class Unsigned32(univ.Integer):
    tagSet = univ.Integer.tagSet.tagImplicitly(
        tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x02)
    )
    subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueRangeConstraint(
        0, 4294967295
    )


class TimeTicks(univ.Integer):
    tagSet = univ.Integer.tagSet.tagImplicitly(
        tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x03)
    )
    subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueRangeConstraint(
        0, 4294967295
    )


class Opaque(univ.OctetString):
    tagSet = univ.OctetString.tagSet.tagImplicitly(
        tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x04)
    )


class Counter64(univ.Integer):
    tagSet = univ.Integer.tagSet.tagImplicitly(
        tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x06)
    )
    subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueRangeConstraint(
        0, 18446744073709551615
    )


class Bits(univ.OctetString):
    pass


class ObjectName(univ.ObjectIdentifier):
    pass


class SimpleSyntax(univ.Choice):
    componentType = namedtype.NamedTypes(
        namedtype.NamedType('integer-value', Integer()),
        namedtype.NamedType('string-value', OctetString()),
        namedtype.NamedType('objectID-value', univ.ObjectIdentifier())
    )


class ApplicationSyntax(univ.Choice):
    componentType = namedtype.NamedTypes(
        namedtype.NamedType('ipAddress-value', IpAddress()),
        namedtype.NamedType('counter-value', Counter32()),
        namedtype.NamedType('timeticks-value', TimeTicks()),
        namedtype.NamedType('arbitrary-value', Opaque()),
        namedtype.NamedType('big-counter-value', Counter64()),
        # This conflicts with Counter32
        #        namedtype.NamedType('unsigned-integer-value', Unsigned32()),
        namedtype.NamedType('gauge32-value', Gauge32())
    )  # BITS misplaced?


class ObjectSyntax(univ.Choice):
    componentType = namedtype.NamedTypes(
        namedtype.NamedType('simple', SimpleSyntax()),
        namedtype.NamedType('application-wide', ApplicationSyntax())
    )

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