@honor-minigame/cli/packager/lib/signature/hex.js

honor minigame pack cli

/*
 * Copyright (C) 2017, hapjs.org. All rights reserved.
 */

'use strict'

var Hex = {}

var decoder

Hex.decode = function (a) {
  var i
  if (decoder === undefined) {
    var hex = '0123456789ABCDEF'

    var ignore = ' \f\n\r\t\u00A0\u2028\u2029'
    decoder = []
    for (i = 0; i < 16; ++i) { decoder[hex.charAt(i)] = i }
    hex = hex.toLowerCase()
    for (i = 10; i < 16; ++i) { decoder[hex.charAt(i)] = i }
    for (i = 0; i < ignore.length; ++i) { decoder[ignore.charAt(i)] = -1 }
  }
  var out = []

  var bits = 0

  var charCount = 0
  for (i = 0; i < a.length; ++i) {
    var c = a.charAt(i)
    if (c === '=') { break }
    c = decoder[c]
    if (c === -1) { continue }
    if (c === undefined) { throw new Error('Illegal character at offset ' + i) }
    bits |= c
    if (++charCount >= 2) {
      out[out.length] = bits
      bits = 0
      charCount = 0
    } else {
      bits <<= 4
    }
  }
  if (charCount) { throw new Error('Hex encoding incomplete: 4 bits missing') }
  return out
}

export default Hex