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Editing File: /home/ubuntu/efiexchange-node-base/node_modules/keccak/lib/api/shake.js

const { Transform } = require('readable-stream')

module.exports = (KeccakState) => class Shake extends Transform {
  constructor (rate, capacity, delimitedSuffix, options) {
    super(options)

this._rate = rate
    this._capacity = capacity
    this._delimitedSuffix = delimitedSuffix
    this._options = options

this._state = new KeccakState()
    this._state.initialize(rate, capacity)
    this._finalized = false
  }

_transform (chunk, encoding, callback) {
    let error = null
    try {
      this.update(chunk, encoding)
    } catch (err) {
      error = err
    }

callback(error)
  }

_flush () {}

_read (size) {
    this.push(this.squeeze(size))
  }

update (data, encoding) {
    if (!Buffer.isBuffer(data) && typeof data !== 'string') throw new TypeError('Data must be a string or a buffer')
    if (this._finalized) throw new Error('Squeeze already called')
    if (!Buffer.isBuffer(data)) data = Buffer.from(data, encoding)

this._state.absorb(data)

return this
  }

squeeze (dataByteLength, encoding) {
    if (!this._finalized) {
      this._finalized = true
      this._state.absorbLastFewBits(this._delimitedSuffix)
    }

let data = this._state.squeeze(dataByteLength)
    if (encoding !== undefined) data = data.toString(encoding)

return data
  }

_resetState () {
    this._state.initialize(this._rate, this._capacity)
    return this
  }

_clone () {
    const clone = new Shake(this._rate, this._capacity, this._delimitedSuffix, this._options)
    this._state.copy(clone._state)
    clone._finalized = this._finalized

return clone
  }
}

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