def self.lookup_account_sid(sid, system_name = nil)
sid = sid.pointer if sid.respond_to?(:pointer)
name_size = FFI::Buffer.new(:long).write_long(0)
referenced_domain_name_size = FFI::Buffer.new(:long).write_long(0)
system_name = system_name.to_wstring if system_name
if LookupAccountSidW(system_name, sid, nil, name_size, nil, referenced_domain_name_size, nil)
raise "Expected ERROR_INSUFFICIENT_BUFFER from LookupAccountSid, and got no error!"
elsif Chef::ReservedNames::Win32::Error::get_last_error != ERROR_INSUFFICIENT_BUFFER
Chef::ReservedNames::Win32::Error.raise!
end
name = FFI::MemoryPointer.new :char, (name_size.read_long*2)
referenced_domain_name = FFI::MemoryPointer.new :char, (referenced_domain_name_size.read_long*2)
use = FFI::Buffer.new(:long).write_long(0)
unless LookupAccountSidW(system_name, sid, name, name_size, referenced_domain_name, referenced_domain_name_size, use)
Chef::ReservedNames::Win32::Error.raise!
end
[ referenced_domain_name.read_wstring(referenced_domain_name_size.read_long), name.read_wstring(name_size.read_long), use.read_long ]
end