ruby-net-ldap/lib/net/ber/core_ext/string.rb
2010-03-20 10:04:32 -04:00

46 lines
1.1 KiB
Ruby

require 'stringio'
module Net::BER::Extensions::String
##
# Converts a string to a BER string. Universal octet-strings are tagged
# with 0x04, but other values are possible depending on the context, so we
# let the caller give us one.
#
# User code should call either #to_ber_application_string or
# #to_ber_contextspecific.
def to_ber(code = 0x04)
[code].pack('C') + length.to_ber_length_encoding + self
end
##
# Creates an application-specific BER string encoded value with the
# provided syntax code value.
def to_ber_application_string(code)
to_ber(0x40 + code)
end
##
# Creates a context-specific BER string encoded value with the provided
# syntax code value.
def to_ber_contextspecific(code)
to_ber(0x80 + code)
end
##
# Nondestructively reads a BER object from this string.
def read_ber(syntax = nil)
StringIO.new(self).read_ber(syntax)
end
##
# Destructively reads a BER object from the string.
def read_ber!(syntax = nil)
io = StringIO.new(self)
result = io.read_ber(syntax)
self.slice!(0...io.pos)
return result
end
end