ruby-net-ldap/lib/net/ldap/core_ext/fixnum.rb

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module Net
class LDAP
module Extensions
module Fixnum
#
# to_ber
#
def to_ber
"\002" + to_ber_internal
end
#
# to_ber_enumerated
#
def to_ber_enumerated
"\012" + to_ber_internal
end
#
# to_ber_length_encoding
#
def to_ber_length_encoding
if self <= 127
[self].pack('C')
else
i = [self].pack('N').sub(/^[\0]+/,"")
[0x80 + i.length].pack('C') + i
end
end
# Generate a BER-encoding for an application-defined INTEGER.
# Example: SNMP's Counter, Gauge, and TimeTick types.
#
def to_ber_application tag
[0x40 + tag].pack("C") + to_ber_internal
end
#--
# Called internally to BER-encode the length and content bytes of a Fixnum.
# The caller will prepend the tag byte.
MAX_SIZE = 0.size
def to_ber_internal
size = MAX_SIZE
while size>1
break if (self & (0xff << (size-1)*8)) > 0
size -= 1
end
result = [size]
while size>0
# right shift size-1 bytes, mask with 0xff
result << ((self >> ((size-1)*8)) & 0xff)
size -= 1
end
result.pack('C*')
end
private :to_ber_internal
end
end
end
end