?? qrcode.js
字號:
[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;
}
};
//---------------------------------------------------------------------
//
//---------------------------------------------------------------------
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 : { length : 256 },
LOG_TABLE : { length : 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;
}
//---------------------------------------------------------------------
//
//---------------------------------------------------------------------
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 = { length : 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 = { length : 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 = { length : 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);
}
};
//---------------------------------------------------------------------
//
//---------------------------------------------------------------------
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 = { length : 0 };
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[list.length++] = 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;
}
}
//---------------------------------------------------------------------
//
//---------------------------------------------------------------------
function QRBitBuffer() {
this.buffer = { length : 0 };
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[this.buffer.length++] = 0;
}
if (bit) {
this.buffer[bufIndex] |= (0x80 >>> (this.length % 8) );
}
this.length++;
}
};
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