/var/www/greso.tech/server/nsm/node_modules/qrcode/lib/core
Edit: /var/www/greso.tech/server/nsm/node_modules/qrcode/lib/core/alphanumeric-data.js (1822B)
const 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}
*/
const 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) {
let 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
let 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