module Yara

# File lib/yara.rb, line 14
def self.test(rule_string, test_string)
  user_data = UserData.new
  scanning = true
  results = []

  Yara::FFI.yr_initialize

  compiler_pointer = ::FFI::MemoryPointer.new(:pointer)
  Yara::FFI.yr_compiler_create(compiler_pointer)
  compiler_pointer = compiler_pointer.get_pointer(0)

  error_callback = proc do |error_level, file_name, line_number, rule, message, user_data|
    # noop
  end

  Yara::FFI.yr_compiler_set_callback(compiler_pointer, error_callback, user_data)
  Yara::FFI.yr_compiler_add_string(compiler_pointer, rule_string, nil)

  rules_pointer =::FFI::MemoryPointer.new(:pointer)
  Yara::FFI.yr_compiler_get_rules(compiler_pointer, rules_pointer)
  rules_pointer = rules_pointer.get_pointer(0)

  result_callback = proc do |context_ptr, callback_type, rule_ptr, user_data_ptr|
    if callback_type == SCAN_FINISHED
      scanning = false
    else
      result = ScanResult.new(callback_type, rule_ptr)
      results << result if result.rule_outcome?
    end

    0 # ERROR_SUCCESS
  end

  test_string_bytesize = test_string.bytesize
  test_string_pointer = ::FFI::MemoryPointer.new(:char, test_string_bytesize)
  test_string_pointer.put_bytes(0, test_string)

  Yara::FFI.yr_rules_scan_mem(
    rules_pointer,
    test_string_pointer,
    test_string_bytesize,
    0,
    result_callback,
    user_data,
    1,
  )

  while scanning do
  end

  results
ensure
  Yara::FFI.yr_rules_destroy(rules_pointer)
  Yara::FFI.yr_compiler_destroy(compiler_pointer)
  Yara::FFI.yr_finalize
end