64 lines
1.6 KiB
JavaScript
64 lines
1.6 KiB
JavaScript
let toSJISFunction
|
|
const CODEWORDS_COUNT = [
|
|
0, // Not used
|
|
26, 44, 70, 100, 134, 172, 196, 242, 292, 346,
|
|
404, 466, 532, 581, 655, 733, 815, 901, 991, 1085,
|
|
1156, 1258, 1364, 1474, 1588, 1706, 1828, 1921, 2051, 2185,
|
|
2323, 2465, 2611, 2761, 2876, 3034, 3196, 3362, 3532, 3706
|
|
]
|
|
|
|
/**
|
|
* Returns the QR Code size for the specified version
|
|
*
|
|
* @param {Number} version QR Code version
|
|
* @return {Number} size of QR code
|
|
*/
|
|
exports.getSymbolSize = function getSymbolSize (version) {
|
|
if (!version) throw new Error('"version" cannot be null or undefined')
|
|
if (version < 1 || version > 40) throw new Error('"version" should be in range from 1 to 40')
|
|
return version * 4 + 17
|
|
}
|
|
|
|
/**
|
|
* Returns the total number of codewords used to store data and EC information.
|
|
*
|
|
* @param {Number} version QR Code version
|
|
* @return {Number} Data length in bits
|
|
*/
|
|
exports.getSymbolTotalCodewords = function getSymbolTotalCodewords (version) {
|
|
return CODEWORDS_COUNT[version]
|
|
}
|
|
|
|
/**
|
|
* Encode data with Bose-Chaudhuri-Hocquenghem
|
|
*
|
|
* @param {Number} data Value to encode
|
|
* @return {Number} Encoded value
|
|
*/
|
|
exports.getBCHDigit = function (data) {
|
|
let digit = 0
|
|
|
|
while (data !== 0) {
|
|
digit++
|
|
data >>>= 1
|
|
}
|
|
|
|
return digit
|
|
}
|
|
|
|
exports.setToSJISFunction = function setToSJISFunction (f) {
|
|
if (typeof f !== 'function') {
|
|
throw new Error('"toSJISFunc" is not a valid function.')
|
|
}
|
|
|
|
toSJISFunction = f
|
|
}
|
|
|
|
exports.isKanjiModeEnabled = function () {
|
|
return typeof toSJISFunction !== 'undefined'
|
|
}
|
|
|
|
exports.toSJIS = function toSJIS (kanji) {
|
|
return toSJISFunction(kanji)
|
|
}
|