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Directory : /var/app/minigim/api/node_modules/qrcode/lib/core/

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Current File : /var/app/minigim/api/node_modules/qrcode/lib/core/alphanumeric-data.js

var Mode = require('./mode')

/**
 * Array of characters available in alphanumeric mode
 *
 * As per QR Code specification, to each character
 * is assigned a value from 0 to 44 which in this case coincides
 * with the array index
 *
 * @type {Array}
 */
var ALPHA_NUM_CHARS = [
  '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
  'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
  'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
  ' ', '$', '%', '*', '+', '-', '.', '/', ':'
]

function AlphanumericData (data) {
  this.mode = Mode.ALPHANUMERIC
  this.data = data
}

AlphanumericData.getBitsLength = function getBitsLength (length) {
  return 11 * Math.floor(length / 2) + 6 * (length % 2)
}

AlphanumericData.prototype.getLength = function getLength () {
  return this.data.length
}

AlphanumericData.prototype.getBitsLength = function getBitsLength () {
  return AlphanumericData.getBitsLength(this.data.length)
}

AlphanumericData.prototype.write = function write (bitBuffer) {
  var i

  // Input data characters are divided into groups of two characters
  // and encoded as 11-bit binary codes.
  for (i = 0; i + 2 <= this.data.length; i += 2) {
    // The character value of the first character is multiplied by 45
    var value = ALPHA_NUM_CHARS.indexOf(this.data[i]) * 45

    // The character value of the second digit is added to the product
    value += ALPHA_NUM_CHARS.indexOf(this.data[i + 1])

    // The sum is then stored as 11-bit binary number
    bitBuffer.put(value, 11)
  }

  // If the number of input data characters is not a multiple of two,
  // the character value of the final character is encoded as a 6-bit binary number.
  if (this.data.length % 2) {
    bitBuffer.put(ALPHA_NUM_CHARS.indexOf(this.data[i]), 6)
  }
}

module.exports = AlphanumericData

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