text: 'use strict'
  // Copyright (c) 2018 Matias Alejo Garcia
  // Copyright (c) 2017 Emilio Almansi
  // Copyright (c) 2017 Pieter Wuille
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  // THE SOFTWARE.
  
  /**
   * Converts an array of integers made up of `from` bits into an
   * array of integers made up of `to` bits. The output array is
   * zero-padded if necessary, unless strict mode is true.
   * Original by Pieter Wuille: https://github.com/sipa/bech32.
   *
   * @param {Array} data Array of integers made up of `from` bits.
   * @param {number} from Length in bits of elements in the input array.
   * @param {number} to Length in bits of elements in the output array.
   * @param {bool} strict Require the conversion to be completed without padding.
   */
  var $ = require('./preconditions')
  
  module.exports = function (data, from, to, strict) {
    strict = strict || false
    var accumulator = 0
    var bits = 0
    var result = []
    var mask = (1 << to) - 1
    for (var i = 0; i < data.length; i++) {
      var value = data[i]
      $.checkArgument(!(value < 0 || (value >> from) !== 0), 'value ' + value)
  
      accumulator = (accumulator << from) | value
      bits += from
      while (bits >= to) {
        bits -= to
        result.push((accumulator >> bits) & mask)
      }
    }
    if (!strict) {
      if (bits > 0) {
        result.push((accumulator << (to - bits)) & mask)
      }
    } else {
      $.checkState(!(bits >= from || ((accumulator << (to - bits)) & mask)), 'Conversion requires padding but strict mode was used')
    }
    return result
  }
  