Method validateInitialBiasValue

src/Encoder/Bootstring.js:541–560

* Validates initial bias setting value according to section 4 of RFC 3492 * such that `initial_bias mod base <= base - tmin`. * @param {number} value Initial bias to be validated * @param {Field} setting Sender field * @return {boolean|object}

(value, setting)

   * @return {boolean|object}
   */
  validateInitialBiasValue (value, setting) {
    // Can't validate initial bias without valid base and tmin values
    if (!this.isSettingValid('digitMapping', 'tmin')) {
      return false
    }

    const base = this.getSettingValue('digitMapping').getLength()
    const tmin = this.getSettingValue('tmin')

    if (MathUtil.mod(value, base) > base - tmin) {
      return {
        key: 'bootstringInitialBiasInvalid',
        message:
          'The value must be chosen such that ' +
          'initial_bias mod base <= base - tmin'
      }
    }

    return true
  }
}