gf256.js

function GF256(e){this.expTable=new Array(256),this.logTable=new Array(256);for(var t=1,r=0;256>r;r++)this.expTable[r]=t,t<<=1,t>=256&&(t^=e);for(var r=0;255>r;r++)this.logTable[this.expTable[r]]=r;var n=new Array(1);n[0]=0,this.zero=new GF256Poly(this,new Array(n));var i=new Array(1);i[0]=1,this.one=new GF256Poly(this,new Array(i)),Object.defineProperties(this,{Zero:{get:function(){return this.zero}},One:{get:function(){return this.one}}}),this.buildMonomial=function(e,t){if(0>e)throw"System.ArgumentException";if(0==t)return zero;for(var r=new Array(e+1),n=0;n<r.length;n++)r[n]=0;return r[0]=t,new GF256Poly(this,r)},this.exp=function(e){return this.expTable[e]},this.log=function(e){if(0==e)throw"System.ArgumentException";return this.logTable[e]},this.inverse=function(e){if(0==e)throw"System.ArithmeticException";return this.expTable[255-this.logTable[e]]},this.multiply=function(e,t){return 0==e||0==t?0:1==e?t:1==t?e:this.expTable[(this.logTable[e]+this.logTable[t])%255]}}GF256.QR_CODE_FIELD=new GF256(285),GF256.DATA_MATRIX_FIELD=new GF256(301),GF256.addOrSubtract=function(e,t){return e^t};