widget-code-zb/module/method/QRBitBuffer.js

中百二维码组件

function QRBitBuffer() {
    this.buffer = [];
    this.length = 0;
}
QRBitBuffer.prototype = {
    get: function(index) {
        var bufIndex = Math.floor(index / 8);
        return ((this.buffer[bufIndex] >>> (7 - index % 8)) & 1) == 1;
    },
    put: function(num, length) {
        for (var i = 0; i < length; i++) {
            this.putBit(((num >>> (length - i - 1)) & 1) == 1);
        }
    },
    getLengthInBits: function() {
        return this.length;
    },
    putBit: function(bit) {
        var 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++;
    }
};

export default QRBitBuffer;