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# -*- ruby encoding: utf-8 -*-
require 'stringio'
##
# BER extensions to the String class.
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)
raw_string = raw_utf8_encoded
[code].pack('C') + raw_string.length.to_ber_length_encoding + raw_string
end
##
# Converts a string to a BER string but does *not* encode to UTF-8 first.
# This is required for proper representation of binary data for Microsoft
# Active Directory
def to_ber_bin(code = 0x04)
[code].pack('C') + length.to_ber_length_encoding + self
end
def raw_utf8_encoded
if self.respond_to?(:encode)
# Strings should be UTF-8 encoded according to LDAP.
# However, the BER code is not necessarily valid UTF-8
begin
self.encode('UTF-8').force_encoding('ASCII-8BIT')
rescue Encoding::UndefinedConversionError
self
rescue Encoding::ConverterNotFoundError
self
rescue Encoding::InvalidByteSequenceError
self
end
else
self
end
end
private :raw_utf8_encoded
##
# 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
def reject_empty_ber_arrays
self.gsub(/0\000/n, '')
end
end
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