docs: function(typeNumber, errorCorrectLevel) {
  
  		var PAD0 = 0xEC;
  		var PAD1 = 0x11;
  
  		var _typeNumber = typeNumber;
  		var _errorCorrectLevel = QRErrorCorrectLevel[errorCorrectLevel];
  		var _modules = null;
  		var _moduleCount = 0;
  		var _dataCache = null;
  		var _dataList = new Array();
  
  		var _this = {};
  
  		var makeImpl = function(test, maskPattern) {
  
  			_moduleCount = _typeNumber * 4 + 17;
  			_modules = function(moduleCount) {
  				var modules = new Array(moduleCount);
  				for (var row = 0; row < moduleCount; row += 1) {
  					modules[row] = new Array(moduleCount);
  					for (var col = 0; col < moduleCount; col += 1) {
  						modules[row][col] = null;
  					}
  				}
  				return modules;
  			}(_moduleCount);
  
  			setupPositionProbePattern(0, 0);
  			setupPositionProbePattern(_moduleCount - 7, 0);
  			setupPositionProbePattern(0, _moduleCount - 7);
  			setupPositionAdjustPattern();
  			setupTimingPattern();
  			setupTypeInfo(test, maskPattern);
  
  			if (_typeNumber >= 7) {
  				setupTypeNumber(test);
  			}
  
  			if (_dataCache == null) {
  				_dataCache = createData(_typeNumber, _errorCorrectLevel, _dataList);
  			}
  
  			mapData(_dataCache, maskPattern);
  		};
  
  		var setupPositionProbePattern = function(row, col) {
  
  			for (var r = -1; r <= 7; r += 1) {
  
  				if (row + r <= -1 || _moduleCount <= row + r) continue;
  
  				for (var c = -1; c <= 7; c += 1) {
  
  					if (col + c <= -1 || _moduleCount <= col + c) continue;
  
  					if ( (0 <= r && r <= 6 && (c == 0 || c == 6) )
  							|| (0 <= c && c <= 6 && (r == 0 || r == 6) )
  							|| (2 <= r && r <= 4 && 2 <= c && c <= 4) ) {
  						_modules[row + r][col + c] = true;
  					} else {
  						_modules[row + r][col + c] = false;
  					}
  				}
  			}
  		};
  
  		var getBestMaskPattern = function() {
  
  			var minLostPoint = 0;
  			var pattern = 0;
  
  			for (var i = 0; i < 8; i += 1) {
  
  				makeImpl(true, i);
  
  				var lostPoint = QRUtil.getLostPoint(_this);
  
  				if (i == 0 || minLostPoint > lostPoint) {
  					minLostPoint = lostPoint;
  					pattern = i;
  				}
  			}
  
  			return pattern;
  		};
  
  		var setupTimingPattern = function() {
  
  			for (var r = 8; r < _moduleCount - 8; r += 1) {
  				if (_modules[r][6] != null) {
  					continue;
  				}
  				_modules[r][6] = (r % 2 == 0);
  			}
  
  			for (var c = 8; c < _moduleCount - 8; c += 1) {
  				if (_modules[6][c] != null) {
  					continue;
  				}
  				_modules[6][c] = (c % 2 == 0);
  			}
  		};
  
  		var setupPositionAdjustPattern = function() {
  
  			var pos = QRUtil.getPatternPosition(_typeNumber);
  
  			for (var i = 0; i < pos.length; i += 1) {
  
  				for (var j = 0; j < pos.length; j += 1) {
  
  					var row = pos[i];
  					var col = pos[j];
  
  					if (_modules[row][col] != null) {
  						continue;
  					}
  
  					for (var r = -2; r <= 2; r += 1) {
  
  						for (var c = -2; c <= 2; c += 1) {
  
  							if (r == -2 || r == 2 || c == -2 || c == 2
  									|| (r == 0 && c == 0) ) {
  								_modules[row + r][col + c] = true;
  							} else {
  								_modules[row + r][col + c] = false;
  							}
  						}
  					}
  				}
  			}
  		};
  
  		var setupTypeNumber = function(test) {
  
  			var bits = QRUtil.getBCHTypeNumber(_typeNumber);
  
  			for (var i = 0; i < 18; i += 1) {
  				var mod = (!test && ( (bits >> i) & 1) == 1);
  				_modules[Math.floor(i / 3)][i % 3 + _moduleCount - 8 - 3] = mod;
  			}
  
  			for (var i = 0; i < 18; i += 1) {
  				var mod = (!test && ( (bits >> i) & 1) == 1);
  				_modules[i % 3 + _moduleCount - 8 - 3][Math.floor(i / 3)] = mod;
  			}
  		};
  
  		var setupTypeInfo = function(test, maskPattern) {
  
  			var data = (_errorCorrectLevel << 3) | maskPattern;
  			var bits = QRUtil.getBCHTypeInfo(data);
  
  			// vertical
  			for (var i = 0; i < 15; i += 1) {
  
  				var mod = (!test && ( (bits >> i) & 1) == 1);
  
  				if (i < 6) {
  					_modules[i][8] = mod;
  				} else if (i < 8) {
  					_modules[i + 1][8] = mod;
  				} else {
  					_modules[_moduleCount - 15 + i][8] = mod;
  				}
  			}
  
  			// horizontal
  			for (var i = 0; i < 15; i += 1) {
  
  				var mod = (!test && ( (bits >> i) & 1) == 1);
  
  				if (i < 8) {
  					_modules[8][_moduleCount - i - 1] = mod;
  				} else if (i < 9) {
  					_modules[8][15 - i - 1 + 1] = mod;
  				} else {
  					_modules[8][15 - i - 1] = mod;
  				}
  			}
  
  			// fixed module
  			_modules[_moduleCount - 8][8] = (!test);
  		};
  
  		var mapData = function(data, maskPattern) {
  
  			var inc = -1;
  			var row = _moduleCount - 1;
  			var bitIndex = 7;
  			var byteIndex = 0;
  			var maskFunc = QRUtil.getMaskFunction(maskPattern);
  
  			for (var col = _moduleCount - 1; col > 0; col -= 2) {
  
  				if (col == 6) col -= 1;
  
  				while (true) {
  
  					for (var c = 0; c < 2; c += 1) {
  
  						if (_modules[row][col - c] == null) {
  
  							var dark = false;
  
  							if (byteIndex < data.length) {
  								dark = ( ( (data[byteIndex] >>> bitIndex) & 1) == 1);
  							}
  
  							var mask = maskFunc(row, col - c);
  
  							if (mask) {
  								dark = !dark;
  							}
  
  							_modules[row][col - c] = dark;
  							bitIndex -= 1;
  
  							if (bitIndex == -1) {
  								byteIndex += 1;
  								bitIndex = 7;
  							}
  						}
  					}
  
  					row += inc;
  
  					if (row < 0 || _moduleCount <= row) {
  						row -= inc;
  						inc = -inc;
  						break;
  					}
  				}
  			}
  		};
  
  		var createBytes = function(buffer, rsBlocks) {
  
  			var offset = 0;
  
  			var maxDcCount = 0;
  			var maxEcCount = 0;
  
  			var dcdata = new Array(rsBlocks.length);
  			var ecdata = new Array(rsBlocks.length);
  
  			for (var r = 0; r < rsBlocks.length; r += 1) {
  
  				var dcCount = rsBlocks[r].dataCount;
  				var ecCount = rsBlocks[r].totalCount - dcCount;
  
  				maxDcCount = Math.max(maxDcCount, dcCount);
  				maxEcCount = Math.max(maxEcCount, ecCount);
  
  				dcdata[r] = new Array(dcCount);
  
  				for (var i = 0; i < dcdata[r].length; i += 1) {
  					dcdata[r][i] = 0xff & buffer.getBuffer()[i + offset];
  				}
  				offset += dcCount;
  
  				var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount);
  				var rawPoly = qrPolynomial(dcdata[r], rsPoly.getLength() - 1);
  
  				var modPoly = rawPoly.mod(rsPoly);
  				ecdata[r] = new Array(rsPoly.getLength() - 1);
  				for (var i = 0; i < ecdata[r].length; i += 1) {
  					var modIndex = i + modPoly.getLength() - ecdata[r].length;
  					ecdata[r][i] = (modIndex >= 0)? modPoly.getAt(modIndex) : 0;
  				}
  			}
  
  			var totalCodeCount = 0;
  			for (var i = 0; i < rsBlocks.length; i += 1) {
  				totalCodeCount += rsBlocks[i].totalCount;
  			}
  
  			var data = new Array(totalCodeCount);
  			var index = 0;
  
  			for (var i = 0; i < maxDcCount; i += 1) {
  				for (var r = 0; r < rsBlocks.length; r += 1) {
  					if (i < dcdata[r].length) {
  						data[index] = dcdata[r][i];
  						index += 1;
  					}
  				}
  			}
  
  			for (var i = 0; i < maxEcCount; i += 1) {
  				for (var r = 0; r < rsBlocks.length; r += 1) {
  					if (i < ecdata[r].length) {
  						data[index] = ecdata[r][i];
  						index += 1;
  					}
  				}
  			}
  
  			return data;
  		};
  
  		var createData = function(typeNumber, errorCorrectLevel, dataList) {
  
  			var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, errorCorrectLevel);
  
  			var buffer = qrBitBuffer();
  
  			for (var i = 0; i < dataList.length; i += 1) {
  				var data = dataList[i];
  				buffer.put(data.getMode(), 4);
  				buffer.put(data.getLength(), QRUtil.getLengthInBits(data.getMode(), typeNumber) );
  				data.write(buffer);
  			}
  
  			// calc num max data.
  			var totalDataCount = 0;
  			for (var i = 0; i < rsBlocks.length; i += 1) {
  				totalDataCount += rsBlocks[i].dataCount;
  			}
  
  			if (buffer.getLengthInBits() > totalDataCount * 8) {
  				throw new Error('code length overflow. ('
  					+ buffer.getLengthInBits()
  					+ '>'
  					+ totalDataCount * 8
  					+ ')');
  			}
  
  			// end code
  			if (buffer.getLengthInBits() + 4 <= totalDataCount * 8) {
  				buffer.put(0, 4);
  			}
  
  			// padding
  			while (buffer.getLengthInBits() % 8 != 0) {
  				buffer.putBit(false);
  			}
  
  			// padding
  			while (true) {
  
  				if (buffer.getLengthInBits() >= totalDataCount * 8) {
  					break;
  				}
  				buffer.put(PAD0, 8);
  
  				if (buffer.getLengthInBits() >= totalDataCount * 8) {
  					break;
  				}
  				buffer.put(PAD1, 8);
  			}
  
  			return createBytes(buffer, rsBlocks);
  		};
  
  		_this.addData = function(data) {
  			var newData = qr8BitByte(data);
  			_dataList.push(newData);
  			_dataCache = null;
  		};
  
  		_this.isDark = function(row, col) {
  			if (row < 0 || _moduleCount <= row || col < 0 || _moduleCount <= col) {
  				throw new Error(row + ',' + col);
  			}
  			return _modules[row][col];
  		};
  
  		_this.getModuleCount = function() {
  			return _moduleCount;
  		};
  
  		_this.make = function() {
  			makeImpl(false, getBestMaskPattern() );
  		};
  
  		_this.createTableTag = function(cellSize, margin) {
  
  			cellSize = cellSize || 2;
  			margin = (typeof margin == 'undefined')? cellSize * 4 : margin;
  
  			var qrHtml = '';
  
  			qrHtml += '<table style="';
  			qrHtml += ' border-width: 0px; border-style: none;';
  			qrHtml += ' border-collapse: collapse;';
  			qrHtml += ' padding: 0px; margin: ' + margin + 'px;';
  			qrHtml += '">';
  			qrHtml += '<tbody>';
  
  			for (var r = 0; r < _this.getModuleCount(); r += 1) {
  
  				qrHtml += '<tr>';
  
  				for (var c = 0; c < _this.getModuleCount(); c += 1) {
  					qrHtml += '<td style="';
  					qrHtml += ' border-width: 0px; border-style: none;';
  					qrHtml += ' border-collapse: collapse;';
  					qrHtml += ' padding: 0px; margin: 0px;';
  					qrHtml += ' width: ' + cellSize + 'px;';
  					qrHtml += ' height: ' + cellSize + 'px;';
  					qrHtml += ' background-color: ';
  					qrHtml += _this.isDark(r, c)? '#000000' : '#ffffff';
  					qrHtml += ';';
  					qrHtml += '"/>';
  				}
  
  				qrHtml += '</tr>';
  			}
  
  			qrHtml += '</tbody>';
  			qrHtml += '</table>';
  
  			return qrHtml;
  		};
  
  		_this.createImgTag = function(cellSize, margin) {
  
  			cellSize = cellSize || 2;
  			margin = (typeof margin == 'undefined')? cellSize * 4 : margin;
  
  			var size = _this.getModuleCount() * cellSize + margin * 2;
  			var min = margin;
  			var max = size - margin;
  
  			return createImgTag(size, size, function(x, y) {
  				if (min <= x && x < max && min <= y && y < max) {
  					var c = Math.floor( (x - min) / cellSize);
  					var r = Math.floor( (y - min) / cellSize);
  					return _this.isDark(r, c)? 0 : 1;
  				} else {
  					return 1;
  				}
  			} );
  		};
  
  		return _this;
  	}