273 lines
8.0 KiB
JavaScript
273 lines
8.0 KiB
JavaScript
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var QRMode = require('./QRMode');
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var QRPolynomial = require('./QRPolynomial');
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var QRMath = require('./QRMath');
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var QRMaskPattern = require('./QRMaskPattern');
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var QRUtil = {
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PATTERN_POSITION_TABLE : [
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[],
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[6, 18],
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[6, 22],
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[6, 26],
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[6, 30],
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[6, 34],
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[6, 22, 38],
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[6, 24, 42],
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[6, 26, 46],
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[6, 28, 50],
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[6, 30, 54],
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[6, 32, 58],
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[6, 34, 62],
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[6, 26, 46, 66],
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[6, 26, 48, 70],
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[6, 26, 50, 74],
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[6, 30, 54, 78],
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[6, 30, 56, 82],
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[6, 30, 58, 86],
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[6, 34, 62, 90],
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[6, 28, 50, 72, 94],
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[6, 26, 50, 74, 98],
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[6, 30, 54, 78, 102],
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[6, 28, 54, 80, 106],
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[6, 32, 58, 84, 110],
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[6, 30, 58, 86, 114],
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[6, 34, 62, 90, 118],
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[6, 26, 50, 74, 98, 122],
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[6, 30, 54, 78, 102, 126],
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[6, 26, 52, 78, 104, 130],
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[6, 30, 56, 82, 108, 134],
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[6, 34, 60, 86, 112, 138],
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[6, 30, 58, 86, 114, 142],
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[6, 34, 62, 90, 118, 146],
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[6, 30, 54, 78, 102, 126, 150],
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[6, 24, 50, 76, 102, 128, 154],
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[6, 28, 54, 80, 106, 132, 158],
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[6, 32, 58, 84, 110, 136, 162],
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[6, 26, 54, 82, 110, 138, 166],
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[6, 30, 58, 86, 114, 142, 170]
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],
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G15 : (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) | (1 << 0),
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G18 : (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0),
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G15_MASK : (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1),
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getBCHTypeInfo : function(data) {
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var d = data << 10;
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while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15) >= 0) {
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d ^= (QRUtil.G15 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15) ) );
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}
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return ( (data << 10) | d) ^ QRUtil.G15_MASK;
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},
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getBCHTypeNumber : function(data) {
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var d = data << 12;
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while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18) >= 0) {
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d ^= (QRUtil.G18 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18) ) );
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}
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return (data << 12) | d;
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},
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getBCHDigit : function(data) {
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var digit = 0;
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while (data !== 0) {
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digit++;
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data >>>= 1;
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}
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return digit;
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},
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getPatternPosition : function(typeNumber) {
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return QRUtil.PATTERN_POSITION_TABLE[typeNumber - 1];
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},
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getMask : function(maskPattern, i, j) {
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switch (maskPattern) {
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case QRMaskPattern.PATTERN000 : return (i + j) % 2 === 0;
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case QRMaskPattern.PATTERN001 : return i % 2 === 0;
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case QRMaskPattern.PATTERN010 : return j % 3 === 0;
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case QRMaskPattern.PATTERN011 : return (i + j) % 3 === 0;
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case QRMaskPattern.PATTERN100 : return (Math.floor(i / 2) + Math.floor(j / 3) ) % 2 === 0;
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case QRMaskPattern.PATTERN101 : return (i * j) % 2 + (i * j) % 3 === 0;
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case QRMaskPattern.PATTERN110 : return ( (i * j) % 2 + (i * j) % 3) % 2 === 0;
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case QRMaskPattern.PATTERN111 : return ( (i * j) % 3 + (i + j) % 2) % 2 === 0;
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default :
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throw new Error("bad maskPattern:" + maskPattern);
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}
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},
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getErrorCorrectPolynomial : function(errorCorrectLength) {
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var a = new QRPolynomial([1], 0);
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for (var i = 0; i < errorCorrectLength; i++) {
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a = a.multiply(new QRPolynomial([1, QRMath.gexp(i)], 0) );
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}
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return a;
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},
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getLengthInBits : function(mode, type) {
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if (1 <= type && type < 10) {
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// 1 - 9
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switch(mode) {
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case QRMode.MODE_NUMBER : return 10;
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case QRMode.MODE_ALPHA_NUM : return 9;
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case QRMode.MODE_8BIT_BYTE : return 8;
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case QRMode.MODE_KANJI : return 8;
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default :
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throw new Error("mode:" + mode);
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}
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} else if (type < 27) {
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// 10 - 26
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switch(mode) {
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case QRMode.MODE_NUMBER : return 12;
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case QRMode.MODE_ALPHA_NUM : return 11;
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case QRMode.MODE_8BIT_BYTE : return 16;
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case QRMode.MODE_KANJI : return 10;
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default :
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throw new Error("mode:" + mode);
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}
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} else if (type < 41) {
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// 27 - 40
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switch(mode) {
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case QRMode.MODE_NUMBER : return 14;
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case QRMode.MODE_ALPHA_NUM : return 13;
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case QRMode.MODE_8BIT_BYTE : return 16;
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case QRMode.MODE_KANJI : return 12;
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default :
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throw new Error("mode:" + mode);
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}
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} else {
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throw new Error("type:" + type);
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}
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},
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getLostPoint : function(qrCode) {
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var moduleCount = qrCode.getModuleCount();
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var lostPoint = 0;
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var row = 0;
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var col = 0;
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// LEVEL1
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for (row = 0; row < moduleCount; row++) {
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for (col = 0; col < moduleCount; col++) {
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var sameCount = 0;
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var dark = qrCode.isDark(row, col);
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for (var r = -1; r <= 1; r++) {
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if (row + r < 0 || moduleCount <= row + r) {
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continue;
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}
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for (var c = -1; c <= 1; c++) {
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if (col + c < 0 || moduleCount <= col + c) {
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continue;
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}
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if (r === 0 && c === 0) {
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continue;
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}
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if (dark === qrCode.isDark(row + r, col + c) ) {
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sameCount++;
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}
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}
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}
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if (sameCount > 5) {
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lostPoint += (3 + sameCount - 5);
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}
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}
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}
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// LEVEL2
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for (row = 0; row < moduleCount - 1; row++) {
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for (col = 0; col < moduleCount - 1; col++) {
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var count = 0;
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if (qrCode.isDark(row, col ) ) count++;
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if (qrCode.isDark(row + 1, col ) ) count++;
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if (qrCode.isDark(row, col + 1) ) count++;
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if (qrCode.isDark(row + 1, col + 1) ) count++;
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if (count === 0 || count === 4) {
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lostPoint += 3;
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}
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}
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}
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// LEVEL3
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for (row = 0; row < moduleCount; row++) {
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for (col = 0; col < moduleCount - 6; col++) {
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if (qrCode.isDark(row, col) &&
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!qrCode.isDark(row, col + 1) &&
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qrCode.isDark(row, col + 2) &&
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qrCode.isDark(row, col + 3) &&
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qrCode.isDark(row, col + 4) &&
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!qrCode.isDark(row, col + 5) &&
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qrCode.isDark(row, col + 6) ) {
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lostPoint += 40;
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}
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}
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}
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for (col = 0; col < moduleCount; col++) {
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for (row = 0; row < moduleCount - 6; row++) {
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if (qrCode.isDark(row, col) &&
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!qrCode.isDark(row + 1, col) &&
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qrCode.isDark(row + 2, col) &&
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qrCode.isDark(row + 3, col) &&
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qrCode.isDark(row + 4, col) &&
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!qrCode.isDark(row + 5, col) &&
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qrCode.isDark(row + 6, col) ) {
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lostPoint += 40;
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}
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}
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}
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// LEVEL4
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var darkCount = 0;
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for (col = 0; col < moduleCount; col++) {
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for (row = 0; row < moduleCount; row++) {
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if (qrCode.isDark(row, col) ) {
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darkCount++;
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}
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}
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}
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var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5;
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lostPoint += ratio * 10;
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return lostPoint;
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}
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};
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module.exports = QRUtil;
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