bitcoin-atm

datamask.js

(3848B)

 /*
   Ported to JavaScript by Lazar Laszlo 2011 
   
   lazarsoft@gmail.com, www.lazarsoft.info
   
 */
 
 /*
 *
 * Copyright 2007 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
 
 DataMask = {};
 
 DataMask.forReference = function(reference)
 {
 	if (reference < 0 || reference > 7)
 	{
 		throw "System.ArgumentException";
 	}
 	return DataMask.DATA_MASKS[reference];
 }
 
 function DataMask000()
 {
 	this.unmaskBitMatrix=function(bits,  dimension)
 	{
 		for (var i = 0; i < dimension; i++)
 		{
 			for (var j = 0; j < dimension; j++)
 			{
 				if (this.isMasked(i, j))
 				{
 					bits.flip(j, i);
 				}
 			}
 		}
 	}
 	this.isMasked=function( i,  j)
 	{
 		return ((i + j) & 0x01) == 0;
 	}
 }
 
 function DataMask001()
 {
 	this.unmaskBitMatrix=function(bits,  dimension)
 	{
 		for (var i = 0; i < dimension; i++)
 		{
 			for (var j = 0; j < dimension; j++)
 			{
 				if (this.isMasked(i, j))
 				{
 					bits.flip(j, i);
 				}
 			}
 		}
 	}
 	this.isMasked=function( i,  j)
 	{
 		return (i & 0x01) == 0;
 	}
 }
 
 function DataMask010()
 {
 	this.unmaskBitMatrix=function(bits,  dimension)
 	{
 		for (var i = 0; i < dimension; i++)
 		{
 			for (var j = 0; j < dimension; j++)
 			{
 				if (this.isMasked(i, j))
 				{
 					bits.flip(j, i);
 				}
 			}
 		}
 	}
 	this.isMasked=function( i,  j)
 	{
 		return j % 3 == 0;
 	}
 }
 
 function DataMask011()
 {
 	this.unmaskBitMatrix=function(bits,  dimension)
 	{
 		for (var i = 0; i < dimension; i++)
 		{
 			for (var j = 0; j < dimension; j++)
 			{
 				if (this.isMasked(i, j))
 				{
 					bits.flip(j, i);
 				}
 			}
 		}
 	}
 	this.isMasked=function( i,  j)
 	{
 		return (i + j) % 3 == 0;
 	}
 }
 
 function DataMask100()
 {
 	this.unmaskBitMatrix=function(bits,  dimension)
 	{
 		for (var i = 0; i < dimension; i++)
 		{
 			for (var j = 0; j < dimension; j++)
 			{
 				if (this.isMasked(i, j))
 				{
 					bits.flip(j, i);
 				}
 			}
 		}
 	}
 	this.isMasked=function( i,  j)
 	{
 		return (((URShift(i, 1)) + (j / 3)) & 0x01) == 0;
 	}
 }
 
 function DataMask101()
 {
 	this.unmaskBitMatrix=function(bits,  dimension)
 	{
 		for (var i = 0; i < dimension; i++)
 		{
 			for (var j = 0; j < dimension; j++)
 			{
 				if (this.isMasked(i, j))
 				{
 					bits.flip(j, i);
 				}
 			}
 		}
 	}
 	this.isMasked=function( i,  j)
 	{
 		var temp = i * j;
 		return (temp & 0x01) + (temp % 3) == 0;
 	}
 }
 
 function DataMask110()
 {
 	this.unmaskBitMatrix=function(bits,  dimension)
 	{
 		for (var i = 0; i < dimension; i++)
 		{
 			for (var j = 0; j < dimension; j++)
 			{
 				if (this.isMasked(i, j))
 				{
 					bits.flip(j, i);
 				}
 			}
 		}
 	}
 	this.isMasked=function( i,  j)
 	{
 		var temp = i * j;
 		return (((temp & 0x01) + (temp % 3)) & 0x01) == 0;
 	}
 }
 function DataMask111()
 {
 	this.unmaskBitMatrix=function(bits,  dimension)
 	{
 		for (var i = 0; i < dimension; i++)
 		{
 			for (var j = 0; j < dimension; j++)
 			{
 				if (this.isMasked(i, j))
 				{
 					bits.flip(j, i);
 				}
 			}
 		}
 	}
 	this.isMasked=function( i,  j)
 	{
 		return ((((i + j) & 0x01) + ((i * j) % 3)) & 0x01) == 0;
 	}
 }
 
 DataMask.DATA_MASKS = new Array(new DataMask000(), new DataMask001(), new DataMask010(), new DataMask011(), new DataMask100(), new DataMask101(), new DataMask110(), new DataMask111());