qrcode.js

//---------------------------------------------------------------------
// QRCode for JavaScript
//
// Copyright (c) 2009 Kazuhiko Arase
//
// URL: http://www.d-project.com/
//
// Licensed under the MIT license:
//   http://www.opensource.org/licenses/mit-license.php
//
// The word "QR Code" is registered trademark of 
// DENSO WAVE INCORPORATED
//   http://www.denso-wave.com/qrcode/faqpatent-e.html
//
//---------------------------------------------------------------------

//---------------------------------------------------------------------
// QR8bitByte
//---------------------------------------------------------------------

function QR8bitByte(data) {
	this.mode = QRMode.MODE_8BIT_BYTE;
	this.data = data;
}

QR8bitByte.prototype = {

	getLength : function(buffer) {
		return this.data.length;
	},
	
	write : function(buffer) {
		for (var i = 0; i < this.data.length; i++) {
			// not JIS ...
			buffer.put(this.data.charCodeAt(i), 8);
		}
	}
};

//---------------------------------------------------------------------
// QRCode
//---------------------------------------------------------------------

function QRCode(typeNumber, errorCorrectLevel) {
	this.typeNumber = typeNumber;
	this.errorCorrectLevel = errorCorrectLevel;
	this.modules = null;
	this.moduleCount = 0;
	this.dataCache = null;
	this.dataList = new Array();
}

QRCode.prototype = {
	
	addData : function(data) {
		var newData = new QR8bitByte(data);
		this.dataList.push(newData);
		this.dataCache = null;
	},
	
	isDark : function(row, col) {
		if (row < 0 || this.moduleCount <= row || col < 0 || this.moduleCount <= col) {
			throw new Error(row + "," + col);
		}
		return this.modules[row][col];
	},

	getModuleCount : function() {
		return this.moduleCount;
	},
	
	make : function() {
		this.makeImpl(false, this.getBestMaskPattern() );
	},
	
	makeImpl : function(test, maskPattern) {
		
		this.moduleCount = this.typeNumber * 4 + 17;
		this.modules = new Array(this.moduleCount);
		
		for (var row = 0; row < this.moduleCount; row++) {
			
			this.modules[row] = new Array(this.moduleCount);
			
			for (var col = 0; col < this.moduleCount; col++) {
				this.modules[row][col] = null;//(col + row) % 3;
			}
		}
	
		this.setupPositionProbePattern(0, 0);
		this.setupPositionProbePattern(this.moduleCount - 7, 0);
		this.setupPositionProbePattern(0, this.moduleCount - 7);
		this.setupPositionAdjustPattern();
		this.setupTimingPattern();
		this.setupTypeInfo(test, maskPattern);
		
		if (this.typeNumber >= 7) {
			this.setupTypeNumber(test);
		}
	
		if (this.dataCache == null) {
			this.dataCache = QRCode.createData(this.typeNumber, this.errorCorrectLevel, this.dataList);
		}
	
		this.mapData(this.dataCache, maskPattern);
	},

	setupPositionProbePattern : function(row, col)  {
		
		for (var r = -1; r <= 7; r++) {
			
			if (row + r <= -1 || this.moduleCount <= row + r) continue;
			
			for (var c = -1; c <= 7; c++) {
				
				if (col + c <= -1 || this.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) ) {
					this.modules[row + r][col + c] = true;
				} else {
					this.modules[row + r][col + c] = false;
				}
			}		
		}		
	},
	
	getBestMaskPattern : function() {
	
		var minLostPoint = 0;
		var pattern = 0;
	
		for (var i = 0; i < 8; i++) {
			
			this.makeImpl(true, i);
	
			var lostPoint = QRUtil.getLostPoint(this);
	
			if (i == 0 || minLostPoint >  lostPoint) {
				minLostPoint = lostPoint;
				pattern = i;
			}
		}
	
		return pattern;
	},
	
	createMovieClip : function(target_mc, instance_name, depth) {
	
		var qr_mc = target_mc.createEmptyMovieClip(instance_name, depth);
		var cs = 1;
	
		this.make();

		for (var row = 0; row < this.modules.length; row++) {
			
			var y = row * cs;
			
			for (var col = 0; col < this.modules[row].length; col++) {
	
				var x = col * cs;
				var dark = this.modules[row][col];
			
				if (dark) {
					qr_mc.beginFill(0, 100);
					qr_mc.moveTo(x, y);
					qr_mc.lineTo(x + cs, y);
					qr_mc.lineTo(x + cs, y + cs);
					qr_mc.lineTo(x, y + cs);
					qr_mc.endFill();
				}
			}
		}
		
		return qr_mc;
	},

	setupTimingPattern : function() {
		
		for (var r = 8; r < this.moduleCount - 8; r++) {
			if (this.modules[r][6] != null) {
				continue;
			}
			this.modules[r][6] = (r % 2 == 0);
		}
	
		for (var c = 8; c < this.moduleCount - 8; c++) {
			if (this.modules[6][c] != null) {
				continue;
			}
			this.modules[6][c] = (c % 2 == 0);
		}
	},
	
	setupPositionAdjustPattern : function() {
	
		var pos = QRUtil.getPatternPosition(this.typeNumber);
		
		for (var i = 0; i < pos.length; i++) {
		
			for (var j = 0; j < pos.length; j++) {
			
				var row = pos[i];
				var col = pos[j];
				
				if (this.modules[row][col] != null) {
					continue;
				}
				
				for (var r = -2; r <= 2; r++) {
				
					for (var c = -2; c <= 2; c++) {
					
						if (r == -2 || r == 2 || c == -2 || c == 2 
								|| (r == 0 && c == 0) ) {
							this.modules[row + r][col + c] = true;
						} else {
							this.modules[row + r][col + c] = false;
						}
					}
				}
			}
		}
	},
	
	setupTypeNumber : function(test) {
	
		var bits = QRUtil.getBCHTypeNumber(this.typeNumber);
	
		for (var i = 0; i < 18; i++) {
			var mod = (!test && ( (bits >> i) & 1) == 1);
			this.modules[Math.floor(i / 3)][i % 3 + this.moduleCount - 8 - 3] = mod;
		}
	
		for (var i = 0; i < 18; i++) {
			var mod = (!test && ( (bits >> i) & 1) == 1);
			this.modules[i % 3 + this.moduleCount - 8 - 3][Math.floor(i / 3)] = mod;
		}
	},
	
	setupTypeInfo : function(test, maskPattern) {
	
		var data = (this.errorCorrectLevel << 3) | maskPattern;
		var bits = QRUtil.getBCHTypeInfo(data);
	
		// vertical		
		for (var i = 0; i < 15; i++) {
	
			var mod = (!test && ( (bits >> i) & 1) == 1);
	
			if (i < 6) {
				this.modules[i][8] = mod;
			} else if (i < 8) {
				this.modules[i + 1][8] = mod;
			} else {
				this.modules[this.moduleCount - 15 + i][8] = mod;
			}
		}
	
		// horizontal
		for (var i = 0; i < 15; i++) {
	
			var mod = (!test && ( (bits >> i) & 1) == 1);
			
			if (i < 8) {
				this.modules[8][this.moduleCount - i - 1] = mod;
			} else if (i < 9) {
				this.modules[8][15 - i - 1 + 1] = mod;
			} else {
				this.modules[8][15 - i - 1] = mod;
			}
		}
	
		// fixed module
		this.modules[this.moduleCount - 8][8] = (!test);
	
	},
	
	mapData : function(data, maskPattern) {
		
		var inc = -1;
		var row = this.moduleCount - 1;
		var bitIndex = 7;
		var byteIndex = 0;
		
		for (var col = this.moduleCount - 1; col > 0; col -= 2) {
	
			if (col == 6) col--;
	
			while (true) {
	
				for (var c = 0; c < 2; c++) {
					
					if (this.modules[row][col - c] == null) {
						
						var dark = false;
	
						if (byteIndex < data.length) {
							dark = ( ( (data[byteIndex] >>> bitIndex) & 1) == 1);
						}
	
						var mask = QRUtil.getMask(maskPattern, row, col - c);
	
						if (mask) {
							dark = !dark;
						}
						
						this.modules[row][col - c] = dark;
						bitIndex--;
	
						if (bitIndex == -1) {
							byteIndex++;
							bitIndex = 7;
						}
					}
				}
								
				row += inc;
	
				if (row < 0 || this.moduleCount <= row) {
					row -= inc;
					inc = -inc;
					break;
				}
			}
		}
		
	}

};

QRCode.PAD0 = 0xEC;
QRCode.PAD1 = 0x11;

QRCode.createData = function(typeNumber, errorCorrectLevel, dataList) {
	
	var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, errorCorrectLevel);
	
	var buffer = new QRBitBuffer();
	
	for (var i = 0; i < dataList.length; i++) {
		var data = dataList[i];
		buffer.put(data.mode, 4);
		buffer.put(data.getLength(), QRUtil.getLengthInBits(data.mode, typeNumber) );
		data.write(buffer);
	}

	// calc num max data.
	var totalDataCount = 0;
	for (var i = 0; i < rsBlocks.length; i++) {
		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(QRCode.PAD0, 8);
		
		if (buffer.getLengthInBits() >= totalDataCount * 8) {
			break;
		}
		buffer.put(QRCode.PAD1, 8);
	}

	return QRCode.createBytes(buffer, rsBlocks);
}

QRCode.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++) {

		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++) {
			dcdata[r][i] = 0xff & buffer.buffer[i + offset];
		}
		offset += dcCount;
		
		var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount);
		var rawPoly = new 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++) {
            var modIndex = i + modPoly.getLength() - ecdata[r].length;
			ecdata[r][i] = (modIndex >= 0)? modPoly.get(modIndex) : 0;
		}

	}
	
	var totalCodeCount = 0;
	for (var i = 0; i < rsBlocks.length; i++) {
		totalCodeCount += rsBlocks[i].totalCount;
	}

	var data = new Array(totalCodeCount);
	var index = 0;

	for (var i = 0; i < maxDcCount; i++) {
		for (var r = 0; r < rsBlocks.length; r++) {
			if (i < dcdata[r].length) {
				data[index++] = dcdata[r][i];
			}
		}
	}

	for (var i = 0; i < maxEcCount; i++) {
		for (var r = 0; r < rsBlocks.length; r++) {
			if (i < ecdata[r].length) {
				data[index++] = ecdata[r][i];
			}
		}
	}

	return data;

}

//---------------------------------------------------------------------
// QRMode
//---------------------------------------------------------------------

var QRMode = {
	MODE_NUMBER :		1 << 0,
	MODE_ALPHA_NUM : 	1 << 1,
	MODE_8BIT_BYTE : 	1 << 2,
	MODE_KANJI :		1 << 3
};

//---------------------------------------------------------------------
// QRErrorCorrectLevel
//---------------------------------------------------------------------
 
var QRErrorCorrectLevel = {
	L : 1,
	M : 0,
	Q : 3,
	H : 2
};

//---------------------------------------------------------------------
// QRMaskPattern
//---------------------------------------------------------------------

var QRMaskPattern = {
	PATTERN000 : 0,
	PATTERN001 : 1,
	PATTERN010 : 2,
	PATTERN011 : 3,
	PATTERN100 : 4,
	PATTERN101 : 5,
	PATTERN110 : 6,
	PATTERN111 : 7
};

//---------------------------------------------------------------------
// QRUtil
//---------------------------------------------------------------------
 
var QRUtil = {

    PATTERN_POSITION_TABLE : [
	    [],
	    [6, 18],
	    [6, 22],
	    [6, 26],
	    [6, 30],
	    [6, 34],
	    [6, 22, 38],
	    [6, 24, 42],
	    [6, 26, 46],
	    [6, 28, 50],
	    [6, 30, 54],		
	    [6, 32, 58],
	    [6, 34, 62],
	    [6, 26, 46, 66],
	    [6, 26, 48, 70],
	    [6, 26, 50, 74],
	    [6, 30, 54, 78],
	    [6, 30, 56, 82],
	    [6, 30, 58, 86],
	    [6, 34, 62, 90],
	    [6, 28, 50, 72, 94],
	    [6, 26, 50, 74, 98],
	    [6, 30, 54, 78, 102],
	    [6, 28, 54, 80, 106],
	    [6, 32, 58, 84, 110],
	    [6, 30, 58, 86, 114],
	    [6, 34, 62, 90, 118],
	    [6, 26, 50, 74, 98, 122],
	    [6, 30, 54, 78, 102, 126],
	    [6, 26, 52, 78, 104, 130],
	    [6, 30, 56, 82, 108, 134],
	    [6, 34, 60, 86, 112, 138],
	    [6, 30, 58, 86, 114, 142],
	    [6, 34, 62, 90, 118, 146],
	    [6, 30, 54, 78, 102, 126, 150],
	    [6, 24, 50, 76, 102, 128, 154],
	    [6, 28, 54, 80, 106, 132, 158],
	    [6, 32, 58, 84, 110, 136, 162],
	    [6, 26, 54, 82, 110, 138, 166],
	    [6, 30, 58, 86, 114, 142, 170]
    ],

    G15 : (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) | (1 << 0),
    G18 : (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0),
    G15_MASK : (1 << 14) | (1 << 12) | (1 << 10)	| (1 << 4) | (1 << 1),

    getBCHTypeInfo : function(data) {
	    var d = data << 10;
	    while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15) >= 0) {
		    d ^= (QRUtil.G15 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15) ) ); 	
	    }
	    return ( (data << 10) | d) ^ QRUtil.G15_MASK;
    },

    getBCHTypeNumber : function(data) {
	    var d = data << 12;
	    while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18) >= 0) {
		    d ^= (QRUtil.G18 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18) ) ); 	
	    }
	    return (data << 12) | d;
    },

    getBCHDigit : function(data) {

	    var digit = 0;

	    while (data != 0) {
		    digit++;
		    data >>>= 1;
	    }

	    return digit;
    },

    getPatternPosition : function(typeNumber) {
	    return QRUtil.PATTERN_POSITION_TABLE[typeNumber - 1];
    },

    getMask : function(maskPattern, i, j) {
	    
	    switch (maskPattern) {
		    
	    case QRMaskPattern.PATTERN000 : return (i + j) % 2 == 0;
	    case QRMaskPattern.PATTERN001 : return i % 2 == 0;
	    case QRMaskPattern.PATTERN010 : return j % 3 == 0;
	    case QRMaskPattern.PATTERN011 : return (i + j) % 3 == 0;
	    case QRMaskPattern.PATTERN100 : return (Math.floor(i / 2) + Math.floor(j / 3) ) % 2 == 0;
	    case QRMaskPattern.PATTERN101 : return (i * j) % 2 + (i * j) % 3 == 0;
	    case QRMaskPattern.PATTERN110 : return ( (i * j) % 2 + (i * j) % 3) % 2 == 0;
	    case QRMaskPattern.PATTERN111 : return ( (i * j) % 3 + (i + j) % 2) % 2 == 0;

	    default :
		    throw new Error("bad maskPattern:" + maskPattern);
	    }
    },

    getErrorCorrectPolynomial : function(errorCorrectLength) {

	    var a = new QRPolynomial([1], 0);

	    for (var i = 0; i < errorCorrectLength; i++) {
		    a = a.multiply(new QRPolynomial([1, QRMath.gexp(i)], 0) );
	    }

	    return a;
    },

    getLengthInBits : function(mode, type) {

	    if (1 <= type && type < 10) {

		    // 1 - 9

		    switch(mode) {
		    case QRMode.MODE_NUMBER 	: return 10;
		    case QRMode.MODE_ALPHA_NUM 	: return 9;
		    case QRMode.MODE_8BIT_BYTE	: return 8;
		    case QRMode.MODE_KANJI  	: return 8;
		    default :
			    throw new Error("mode:" + mode);
		    }

	    } else if (type < 27) {

		    // 10 - 26

		    switch(mode) {
		    case QRMode.MODE_NUMBER 	: return 12;
		    case QRMode.MODE_ALPHA_NUM 	: return 11;
		    case QRMode.MODE_8BIT_BYTE	: return 16;
		    case QRMode.MODE_KANJI  	: return 10;
		    default :
			    throw new Error("mode:" + mode);
		    }

	    } else if (type < 41) {

		    // 27 - 40

		    switch(mode) {
		    case QRMode.MODE_NUMBER 	: return 14;
		    case QRMode.MODE_ALPHA_NUM	: return 13;
		    case QRMode.MODE_8BIT_BYTE	: return 16;
		    case QRMode.MODE_KANJI  	: return 12;
		    default :
			    throw new Error("mode:" + mode);
		    }

	    } else {
		    throw new Error("type:" + type);
	    }
    },

    getLostPoint : function(qrCode) {
	    
	    var moduleCount = qrCode.getModuleCount();
	    
	    var lostPoint = 0;
	    
	    // LEVEL1
	    
	    for (var row = 0; row < moduleCount; row++) {

		    for (var col = 0; col < moduleCount; col++) {

			    var sameCount = 0;
			    var dark = qrCode.isDark(row, col);

				for (var r = -1; r <= 1; r++) {

				    if (row + r < 0 || moduleCount <= row + r) {
					    continue;
				    }

				    for (var c = -1; c <= 1; c++) {

					    if (col + c < 0 || moduleCount <= col + c) {
						    continue;
					    }

					    if (r == 0 && c == 0) {
						    continue;
					    }

					    if (dark == qrCode.isDark(row + r, col + c) ) {
						    sameCount++;
					    }
				    }
			    }

			    if (sameCount > 5) {
				    lostPoint += (3 + sameCount - 5);
			    }
		    }
	    }

	    // LEVEL2

	    for (var row = 0; row < moduleCount - 1; row++) {
		    for (var col = 0; col < moduleCount - 1; col++) {
			    var count = 0;
			    if (qrCode.isDark(row,     col    ) ) count++;
			    if (qrCode.isDark(row + 1, col    ) ) count++;
			    if (qrCode.isDark(row,     col + 1) ) count++;
			    if (qrCode.isDark(row + 1, col + 1) ) count++;
			    if (count == 0 || count == 4) {
				    lostPoint += 3;
			    }
		    }
	    }

	    // LEVEL3

	    for (var row = 0; row < moduleCount; row++) {
		    for (var col = 0; col < moduleCount - 6; col++) {
			    if (qrCode.isDark(row, col)
					    && !qrCode.isDark(row, col + 1)
					    &&  qrCode.isDark(row, col + 2)
					    &&  qrCode.isDark(row, col + 3)
					    &&  qrCode.isDark(row, col + 4)
					    && !qrCode.isDark(row, col + 5)
					    &&  qrCode.isDark(row, col + 6) ) {
				    lostPoint += 40;
			    }
		    }
	    }

	    for (var col = 0; col < moduleCount; col++) {
		    for (var row = 0; row < moduleCount - 6; row++) {
			    if (qrCode.isDark(row, col)
					    && !qrCode.isDark(row + 1, col)
					    &&  qrCode.isDark(row + 2, col)
					    &&  qrCode.isDark(row + 3, col)
					    &&  qrCode.isDark(row + 4, col)
					    && !qrCode.isDark(row + 5, col)
					    &&  qrCode.isDark(row + 6, col) ) {
				    lostPoint += 40;
			    }
		    }
	    }

	    // LEVEL4
	    
	    var darkCount = 0;

	    for (var col = 0; col < moduleCount; col++) {
		    for (var row = 0; row < moduleCount; row++) {
			    if (qrCode.isDark(row, col) ) {
				    darkCount++;
			    }
		    }
	    }
	    
	    var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5;
	    lostPoint += ratio * 10;

	    return lostPoint;		
    }

};


//---------------------------------------------------------------------
// QRMath
//---------------------------------------------------------------------

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;
}

//---------------------------------------------------------------------
// QRPolynomial
//---------------------------------------------------------------------

function QRPolynomial(num, shift) {

	if (num.length == undefined) {
		throw new Error(num.length + "/" + shift);
	}

	var offset = 0;

	while (offset < num.length && num[offset] == 0) {
		offset++;
	}

	this.num = new Array(num.length - offset + shift);
	for (var i = 0; i < num.length - offset; i++) {
		this.num[i] = num[i + offset];
	}
}

QRPolynomial.prototype = {

	get : function(index) {
		return this.num[index];
	},
	
	getLength : function() {
		return this.num.length;
	},
	
	multiply : function(e) {
	
		var num = new Array(this.getLength() + e.getLength() - 1);
	
		for (var i = 0; i < this.getLength(); i++) {
			for (var j = 0; j < e.getLength(); j++) {
				num[i + j] ^= QRMath.gexp(QRMath.glog(this.get(i) ) + QRMath.glog(e.get(j) ) );
			}
		}
	
		return new QRPolynomial(num, 0);
	},
	
	mod : function(e) {
	
		if (this.getLength() - e.getLength() < 0) {
			return this;
		}
	
		var ratio = QRMath.glog(this.get(0) ) - QRMath.glog(e.get(0) );
	
		var num = new Array(this.getLength() );
		
		for (var i = 0; i < this.getLength(); i++) {
			num[i] = this.get(i);
		}
		
		for (var i = 0; i < e.getLength(); i++) {
			num[i] ^= QRMath.gexp(QRMath.glog(e.get(i) ) + ratio);
		}
	
		// recursive call
		return new QRPolynomial(num, 0).mod(e);
	}
};

//---------------------------------------------------------------------
// QRRSBlock
//---------------------------------------------------------------------

function QRRSBlock(totalCount, dataCount) {
	this.totalCount = totalCount;
	this.dataCount  = dataCount;
}

QRRSBlock.RS_BLOCK_TABLE = [

	// L
	// M
	// Q
	// H

	// 1
	[1, 26, 19],
	[1, 26, 16],
	[1, 26, 13],
	[1, 26, 9],
	
	// 2
	[1, 44, 34],
	[1, 44, 28],
	[1, 44, 22],
	[1, 44, 16],

	// 3
	[1, 70, 55],
	[1, 70, 44],
	[2, 35, 17],
	[2, 35, 13],

	// 4		
	[1, 100, 80],
	[2, 50, 32],
	[2, 50, 24],
	[4, 25, 9],
	
	// 5
	[1, 134, 108],
	[2, 67, 43],
	[2, 33, 15, 2, 34, 16],
	[2, 33, 11, 2, 34, 12],
	
	// 6
	[2, 86, 68],
	[4, 43, 27],
	[4, 43, 19],
	[4, 43, 15],
	
	// 7		
	[2, 98, 78],
	[4, 49, 31],
	[2, 32, 14, 4, 33, 15],
	[4, 39, 13, 1, 40, 14],
	
	// 8
	[2, 121, 97],
	[2, 60, 38, 2, 61, 39],
	[4, 40, 18, 2, 41, 19],
	[4, 40, 14, 2, 41, 15],
	
	// 9
	[2, 146, 116],
	[3, 58, 36, 2, 59, 37],
	[4, 36, 16, 4, 37, 17],
	[4, 36, 12, 4, 37, 13],
	
	// 10		
	[2, 86, 68, 2, 87, 69],
	[4, 69, 43, 1, 70, 44],
	[6, 43, 19, 2, 44, 20],
	[6, 43, 15, 2, 44, 16]

];

QRRSBlock.getRSBlocks = function(typeNumber, errorCorrectLevel) {
	
	var rsBlock = QRRSBlock.getRsBlockTable(typeNumber, errorCorrectLevel);
	
	if (rsBlock == undefined) {
		throw new Error("bad rs block @ typeNumber:" + typeNumber + "/errorCorrectLevel:" + errorCorrectLevel);
	}

	var length = rsBlock.length / 3;
	
	var list = new Array();
	
	for (var i = 0; i < length; i++) {

		var count = rsBlock[i * 3 + 0];
		var totalCount = rsBlock[i * 3 + 1];
		var dataCount  = rsBlock[i * 3 + 2];

		for (var j = 0; j < count; j++) {
			list.push(new QRRSBlock(totalCount, dataCount) );	
		}
	}
	
	return list;
}

QRRSBlock.getRsBlockTable = function(typeNumber, errorCorrectLevel) {

	switch(errorCorrectLevel) {
	case QRErrorCorrectLevel.L :
		return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 0];
	case QRErrorCorrectLevel.M :
		return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 1];
	case QRErrorCorrectLevel.Q :
		return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 2];
	case QRErrorCorrectLevel.H :
		return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 3];
	default :
		return undefined;
	}
}

//---------------------------------------------------------------------
// QRBitBuffer
//---------------------------------------------------------------------

function QRBitBuffer() {
	this.buffer = new Array();
	this.length = 0;
}

QRBitBuffer.prototype = {

	get : function(index) {
		var bufIndex = Math.floor(index / 8);
		return ( (this.buffer[bufIndex] >>> (7 - index % 8) ) & 1) == 1;
	},
	
	put : function(num, length) {
		for (var i = 0; i < length; i++) {
			this.putBit( ( (num >>> (length - i - 1) ) & 1) == 1);
		}
	},
	
	getLengthInBits : function() {
		return this.length;
	},
	
	putBit : function(bit) {
	
		var bufIndex = Math.floor(this.length / 8);
		if (this.buffer.length <= bufIndex) {
			this.buffer.push(0);
		}
	
		if (bit) {
			this.buffer[bufIndex] |= (0x80 >>> (this.length % 8) );
		}
	
		this.length++;
	}
};