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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 | 7x 7x 7x 7x 582x 582x 582x 6363x 6363x 6363x 582x 7x 7x 7x 7x 7x 2x 2x 2x 2x 2x 2x 2x 621x 621x 657x 657x 621x 550x 2x 2x 2x 2x 2x 2x 90x 90x 90x 90x 90x 91x | /**
* Get BCH code digit
* @param {number} data - numeric data
*/
function getBCHDigit (data) {
let digit = 0
while (data !== 0) {
digit += 1
data >>>= 1
}
return digit
};
const G15 = 0b000010100110111
const G18 = 0b001111100100101
const G15_MASK = 0b101010000010010
/**
* Get type info using Reed–Solomon error correction with Bose–Chaudhuri–Hocquenghem codes (BCH codes)
* @param {number} data - masked error Correction Level info
* @returns {number} bits of BHC code of type info
*/
export function getBCHTypeInfo (data) {
let d = data << 10
while (getBCHDigit(d) - getBCHDigit(G15) >= 0) {
d ^= (G15 << (getBCHDigit(d) - getBCHDigit(G15)))
}
return ((data << 10) | d) ^ G15_MASK
};
/**
* @param {number} data - QR code version
* @returns {number} bits of BHC code of QR code version
*/
export function getBCHTypeNumber (data) {
let d = data << 12
while (getBCHDigit(d) - getBCHDigit(G18) >= 0) {
d ^= (G18 << (getBCHDigit(d) - getBCHDigit(G18)))
}
return (data << 12) | d
};
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