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39 lines
711 B
39 lines
711 B
2 years ago
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function QRBitBuffer() {
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this.buffer = new Array();
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this.length = 0;
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}
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QRBitBuffer.prototype = {
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get : function(index) {
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var bufIndex = Math.floor(index / 8);
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return ( (this.buffer[bufIndex] >>> (7 - index % 8) ) & 1) == 1;
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},
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put : function(num, length) {
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for (var i = 0; i < length; i++) {
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this.putBit( ( (num >>> (length - i - 1) ) & 1) == 1);
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}
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},
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getLengthInBits : function() {
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return this.length;
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},
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putBit : function(bit) {
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var bufIndex = Math.floor(this.length / 8);
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if (this.buffer.length <= bufIndex) {
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this.buffer.push(0);
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}
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if (bit) {
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this.buffer[bufIndex] |= (0x80 >>> (this.length % 8) );
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}
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this.length++;
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}
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};
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module.exports = QRBitBuffer;
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