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Viewing file:     QRMath.js (673 B)      -rw-r--r--

var QRMath = {

	glog : function(n) {
	
		if (n < 1) {
			throw new Error("glog(" + n + ")");
		}
		
		return QRMath.LOG_TABLE[n];
	},
	
	gexp : function(n) {
	
		while (n < 0) {
			n += 255;
		}
	
		while (n >= 256) {
			n -= 255;
		}
	
		return QRMath.EXP_TABLE[n];
	},
	
	EXP_TABLE : new Array(256),
	
	LOG_TABLE : new Array(256)

};
	
for (var i = 0; i < 8; i++) {
	QRMath.EXP_TABLE[i] = 1 << i;
}
for (var i = 8; i < 256; i++) {
	QRMath.EXP_TABLE[i] = QRMath.EXP_TABLE[i - 4]
		^ QRMath.EXP_TABLE[i - 5]
		^ QRMath.EXP_TABLE[i - 6]
		^ QRMath.EXP_TABLE[i - 8];
}
for (var i = 0; i < 255; i++) {
	QRMath.LOG_TABLE[QRMath.EXP_TABLE[i] ] = i;
}

module.exports = QRMath;