@honor-minigame/cli/packager/lib/signature/base64.js

honor minigame pack cli

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

'use strict'

var Base64 = {}

var decoder

Base64.decode = function (a) {
  var i
  if (decoder === undefined) {
    var b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'

    var ignore = '= \f\n\r\t\u00A0\u2028\u2029'
    decoder = []
    for (i = 0; i < 64; ++i) { decoder[b64.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 >= 4) {
      out[out.length] = (bits >> 16)
      out[out.length] = (bits >> 8) & 0xFF
      out[out.length] = bits & 0xFF
      bits = 0
      charCount = 0
    } else {
      bits <<= 6
    }
  }
  switch (charCount) {
    case 1:
      throw new Error('Base64 encoding incomplete: at least 2 bits missing')
    case 2:
      out[out.length] = (bits >> 10)
      break
    case 3:
      out[out.length] = (bits >> 16)
      out[out.length] = (bits >> 8) & 0xFF
      break
  }
  return out
}

Base64.re = /-----BEGIN [^-]+-----([A-Za-z0-9+/=\s]+)-----END [^-]+-----|begin-base64[^\n]+\n([A-Za-z0-9+/=\s]+)====/
Base64.unarmor = function (a) {
  var m = Base64.re.exec(a)
  if (m) {
    if (m[1]) { a = m[1] } else if (m[2]) { a = m[2] } else { throw new Error('RegExp out of sync') }
  }
  return Base64.decode(a)
}

export default Base64