var QRMode = require('./QRMode'); var QRPolynomial = require('./QRPolynomial'); var QRMath = require('./QRMath'); var QRMaskPattern = require('./QRMaskPattern'); 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; var row = 0; var col = 0; // LEVEL1 for (row = 0; row < moduleCount; row++) { for (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 (row = 0; row < moduleCount - 1; row++) { for (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 (row = 0; row < moduleCount; row++) { for (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 (col = 0; col < moduleCount; col++) { for (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 (col = 0; col < moduleCount; col++) { for (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; } }; module.exports = QRUtil;