utils.js

'use strict'

/* istanbul ignore next */
function setLogger (logger) {
  module.exports.logger = logger
}

var BASE = 16 * 16
var LOG_BASE = Math.log(BASE)
var POW_3_BASE = Math.pow(BASE, 3)
var POW_2_BASE = Math.pow(BASE, 2)
var POW_1_BASE = Math.pow(BASE, 1)

var NullCharBuffer = new Buffer([0x00])

function getBuffer (str, options) {
  if (Buffer.isBuffer(str)) return str

  str = options && options.addNullInTheEnd ? str + '\0' : str
  var buff = new Buffer(str, 'utf8')
  return buff
}

function getBufferForTheLength (number, len) {
  if (!len) len = Math.ceil(Math.log(number) / LOG_BASE)
  // -Infinity
  if (len < 0) len = 0

  var buff = new Buffer(len)
  while (len--) {
    buff[len] = number % BASE
    number = Math.floor(number / BASE)
  }
  if (number > BASE) throw new Error('Body to large!')

  return buff
}

function getContentLengthFromBuffer (contentLengthBuffer) {
  return contentLengthBuffer[0] * POW_3_BASE + contentLengthBuffer[1] * POW_2_BASE + contentLengthBuffer[2] * POW_1_BASE + contentLengthBuffer[3]
}

var nullFunction = function () {}
module.exports = {
  logger: {
    debug: nullFunction,
    info: nullFunction,
    error: nullFunction
  },
  setLogger: setLogger,
  NullCharBuffer: NullCharBuffer,
  getBuffer: getBuffer,
  getBufferForTheLength: getBufferForTheLength,
  getContentLengthFromBuffer: getContentLengthFromBuffer
}