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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 74 75 | 7x 29x 29x 258x 29x 29x 29x 29x 29x 29x 29x 32962x 32962x 32962x 32962x 32962x 32962x 32962x 32962x 32992x 32992x 32962x 32962x 1007x 32762x 32962x 64957x 64957x 64957x 64957x 64957x 64957x 32962x 32962x 29x 29x 3731x 3731x 29x 29x 29x 29x 1318x 1318x 29x 29x 29x 29x 29x 29x 29x 4x 4x 4x 29x 29x 29x 29x 29x 200x 200x 200x 200x 1x 187x 200x 200x 1x 187x 200x 200x 29x | export class QrBitBuffer {
/** @type {number[]} */
#byteBuffer = []
#bitLength = 0
/**
* Append bit sequence to bit buffer
* @param {number} num - bit sequence as number
* @param {number} length - bit sequence length
*/
put (num, length) {
const byteBuffer = this.#byteBuffer
const bitLength = this.#bitLength
const newBitLength = bitLength + length
const newBufferLength = (newBitLength + 7) >> 3
let restBits = Math.min((byteBuffer.length << 3) - bitLength, length)
let bufIndex = bitLength >> 3
while (byteBuffer.length < newBufferLength) {
byteBuffer.push(0)
}
let i = 0
if (restBits === 0) {
restBits = Math.min(8, length)
}
while (i < length) {
const shiftLeft = bufIndex === newBufferLength - 1 ? (8 - restBits) : 0
byteBuffer[bufIndex] |= (num << shiftLeft >>> (length - i - restBits)) & (0xff)
i += restBits
bufIndex++
restBits = Math.min(8, length - i)
}
this.#bitLength = newBitLength
};
get byteBuffer () {
return this.#byteBuffer.slice()
}
toByteArray () {
return Uint8Array.from(this.#byteBuffer)
}
get bitLength () {
return this.#bitLength
}
/**
* Get bit value at index, value is either 0 or 1
* @param {number} index - index position
* @returns {number} bit value
*/
getBitAt (index) {
const bufIndex = index >> 3
return (this.#byteBuffer[bufIndex] >>> (7 - index & 0b111)) & 1
}
/**
* @param {0|1|boolean} bit bit to put
*/
putBit (bit) {
const byteBuffer = this.#byteBuffer
const bitLength = this.#bitLength
const bufIndex = bitLength >> 3
if (byteBuffer.length <= bufIndex) {
byteBuffer.push(0)
}
if (bit) {
byteBuffer[bufIndex] |= (0x80 >>> (bitLength & 0b111))
}
this.#bitLength += 1
}
}
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