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++; } }; module.exports = QRBitBuffer;