export default class QRBitBuffer {
    buffer: number[]
    length: number
    constructor() {
        this.buffer = []
        this.length = 0
    }
    get(index) {
        const bufIndex = Math.floor(index / 8)
        return ((this.buffer[bufIndex] >>> (7 - (index % 8))) & 1) == 1
    }

    put(num, length) {
        for (let i = 0; i < length; i++) {
            this.putBit(((num >>> (length - i - 1)) & 1) == 1)
        }
    }

    getLengthInBits() {
        return this.length
    }

    putBit(bit) {
        const bufIndex = Math.floor(this.length / 8)
        if (this.buffer.length <= bufIndex) {
            this.buffer.push(0)
        }

        if (bit) {
            this.buffer[bufIndex] |= 0x80 >>> this.length % 8
        }

        this.length++
    }
}