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/usr/share/pyshared/pyasn1_modules/rfc1902.py is in python-pyasn1-modules 0.0.3-1.

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#
# SNMPv2c message syntax
#
# ASN.1 source from:
# http://www.ietf.org/rfc/rfc1902.txt
#
from pyasn1.type import univ, namedtype, namedval, tag, constraint

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())
        )