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##
# BER extensions to the Array class.
module Net::BER::Extensions::Array
##
# Converts an Array to a BER sequence. All values in the Array are
# expected to be in BER format prior to calling this method.
def to_ber(id = 0)
# The universal sequence tag 0x30 is composed of the base tag value
# (0x10) and the constructed flag (0x20).
to_ber_seq_internal(0x30 + id)
end
alias_method :to_ber_sequence, :to_ber
##
# Converts an Array to a BER set. All values in the Array are expected to
# be in BER format prior to calling this method.
def to_ber_set(id = 0)
# The universal set tag 0x31 is composed of the base tag value (0x11)
# and the constructed flag (0x20).
to_ber_seq_internal(0x31 + id)
end
##
# Converts an Array to an application-specific sequence, assigned a tag
# value that is meaningful to the particular protocol being used. All
# values in the Array are expected to be in BER format pr prior to calling
# this method.
#--
# Implementor's note 20100320(AZ): RFC 4511 (the LDAPv3 protocol) as well
# as earlier RFCs 1777 and 2559 seem to indicate that LDAP only has
# application constructed sequences (0x60). However, ldapsearch sends some
# context-specific constructed sequences (0xA0); other clients may do the
# same. This behaviour appears to violate the RFCs. In real-world
# practice, we may need to change calls of #to_ber_appsequence to
# #to_ber_contextspecific for full LDAP server compatibility.
#
# This note probably belongs elsewhere.
#++
def to_ber_appsequence(id = 0)
# The application sequence tag always starts from the application flag
# (0x40) and the constructed flag (0x20).
to_ber_seq_internal(0x60 + id)
end
##
# Converts an Array to a context-specific sequence, assigned a tag value
# that is meaningful to the particular context of the particular protocol
# being used. All values in the Array are expected to be in BER format
# prior to calling this method.
def to_ber_contextspecific(id = 0)
# The application sequence tag always starts from the context flag
# (0x80) and the constructed flag (0x20).
to_ber_seq_internal(0xa0 + id)
end
##
# The internal sequence packing routine. All values in the Array are
# expected to be in BER format prior to calling this method.
def to_ber_seq_internal(code)
s = self.join
[code].pack('C') + s.length.to_ber_length_encoding + s
end
private :to_ber_seq_internal
##
# SNMP Object Identifiers (OID) are special arrays
#--
# 20100320 AZ: I do not think that this method should be in BER, since
# this appears to be SNMP-specific. This should probably be subsumed by a
# proper SNMP OID object.
#++
def to_ber_oid
ary = self.dup
first = ary.shift
raise Net::BER::BerError, "Invalid OID" unless [0, 1, 2].include?(first)
first = first * 40 + ary.shift
ary.unshift first
oid = ary.pack("w*")
[6, oid.length].pack("CC") + oid
end
end
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