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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | 7x 7x 7x 7x 7x 7x 7x 7x 7x 39x 39x 39x 39x 39x 39x 39x 39x 39x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 14x 14x 14x 14x 14x 14x 14x 14x 14x 14x 2x 2x 2x 2x 2x 2x 2x 2x 2x 39x 39x 39x 36x 36x 34x 14x 19x 26x 26x 26x 12x 26x 12x 12x 25x 14x 33x 33x | import { MODE_KANJI } from './mode-bits.constants.js'
import { textToSjisBytes } from '../utils/text-decode-encode.util.js'
/**
* Create QR code Kanji mode object
* @param {string} data - data of mode object
* @returns {import('./mode-bits.constants.js').ModeObject & {readonly bytes: Uint8Array}} created mode object
*/
export const QrKanji = (data) => {
const bytes = textToSjisBytes(data)
return Object.freeze({
data,
bytes,
mode: MODE_KANJI,
length: ~~(bytes.length / 2),
write: writeDataToBitBuffer.bind(null, bytes),
})
}
/**
* Writes kanji data to bit buffer that will be used to generate the QR code
* @param {Uint8Array} bytes - QrKanji mode object data byte array
* @param {import("./../utils/qr-bit-buffer.js").QrBitBuffer} buffer - target bit buffer
*/
function writeDataToBitBuffer (bytes, buffer) {
let i = 0
while (i + 1 < bytes.length) {
let c = ((0xff & bytes[i]) << 8) | (0xff & bytes[i + 1])
if (c >= 0x8140 && c <= 0x9FFC) {
c -= 0x8140
} else if (c >= 0xE040 && c <= 0xEBBF) {
c -= 0xC140
} else {
throw Error(`illegal char at ${i + 1}/${c}`)
}
c = ((c >>> 8) & 0xff) * 0xC0 + (c & 0xff)
buffer.put(c, 13)
i += 2
}
if (i < bytes.length) {
throw Error(`illegal char at ${i + 1}`)
}
}
/**
* @param {string} text - text to validate
* @returns {import('./mode-bits.constants.js').ModeObject & {readonly bytes: Uint8Array} | null} created mode object or null if invalid
*/
export function getValidQrKanjiOrNull (text) {
const modeObject = QrKanji(text)
const { bytes } = modeObject
if (bytes.length % 2 === 1) {
return null
}
let i = 0
while (i + 1 < bytes.length) {
const c = ((0xff & bytes[i]) << 8) | (0xff & bytes[i + 1])
if (!(
(c >= 0x8140 && c <= 0x9FFC) ||
(c >= 0xE040 && c <= 0xEBBF)
)) {
return null
}
i += 2
}
return modeObject
}
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