import BarcodeReader from './barcode_reader'; function Code128Reader() { BarcodeReader.call(this); } var properties = { CODE_SHIFT: {value: 98}, CODE_C: {value: 99}, CODE_B: {value: 100}, CODE_A: {value: 101}, START_CODE_A: {value: 103}, START_CODE_B: {value: 104}, START_CODE_C: {value: 105}, STOP_CODE: {value: 106}, MODULO: {value: 11}, CODE_PATTERN: {value: [ [2, 1, 2, 2, 2, 2], [2, 2, 2, 1, 2, 2], [2, 2, 2, 2, 2, 1], [1, 2, 1, 2, 2, 3], [1, 2, 1, 3, 2, 2], [1, 3, 1, 2, 2, 2], [1, 2, 2, 2, 1, 3], [1, 2, 2, 3, 1, 2], [1, 3, 2, 2, 1, 2], [2, 2, 1, 2, 1, 3], [2, 2, 1, 3, 1, 2], [2, 3, 1, 2, 1, 2], [1, 1, 2, 2, 3, 2], [1, 2, 2, 1, 3, 2], [1, 2, 2, 2, 3, 1], [1, 1, 3, 2, 2, 2], [1, 2, 3, 1, 2, 2], [1, 2, 3, 2, 2, 1], [2, 2, 3, 2, 1, 1], [2, 2, 1, 1, 3, 2], [2, 2, 1, 2, 3, 1], [2, 1, 3, 2, 1, 2], [2, 2, 3, 1, 1, 2], [3, 1, 2, 1, 3, 1], [3, 1, 1, 2, 2, 2], [3, 2, 1, 1, 2, 2], [3, 2, 1, 2, 2, 1], [3, 1, 2, 2, 1, 2], [3, 2, 2, 1, 1, 2], [3, 2, 2, 2, 1, 1], [2, 1, 2, 1, 2, 3], [2, 1, 2, 3, 2, 1], [2, 3, 2, 1, 2, 1], [1, 1, 1, 3, 2, 3], [1, 3, 1, 1, 2, 3], [1, 3, 1, 3, 2, 1], [1, 1, 2, 3, 1, 3], [1, 3, 2, 1, 1, 3], [1, 3, 2, 3, 1, 1], [2, 1, 1, 3, 1, 3], [2, 3, 1, 1, 1, 3], [2, 3, 1, 3, 1, 1], [1, 1, 2, 1, 3, 3], [1, 1, 2, 3, 3, 1], [1, 3, 2, 1, 3, 1], [1, 1, 3, 1, 2, 3], [1, 1, 3, 3, 2, 1], [1, 3, 3, 1, 2, 1], [3, 1, 3, 1, 2, 1], [2, 1, 1, 3, 3, 1], [2, 3, 1, 1, 3, 1], [2, 1, 3, 1, 1, 3], [2, 1, 3, 3, 1, 1], [2, 1, 3, 1, 3, 1], [3, 1, 1, 1, 2, 3], [3, 1, 1, 3, 2, 1], [3, 3, 1, 1, 2, 1], [3, 1, 2, 1, 1, 3], [3, 1, 2, 3, 1, 1], [3, 3, 2, 1, 1, 1], [3, 1, 4, 1, 1, 1], [2, 2, 1, 4, 1, 1], [4, 3, 1, 1, 1, 1], [1, 1, 1, 2, 2, 4], [1, 1, 1, 4, 2, 2], [1, 2, 1, 1, 2, 4], [1, 2, 1, 4, 2, 1], [1, 4, 1, 1, 2, 2], [1, 4, 1, 2, 2, 1], [1, 1, 2, 2, 1, 4], [1, 1, 2, 4, 1, 2], [1, 2, 2, 1, 1, 4], [1, 2, 2, 4, 1, 1], [1, 4, 2, 1, 1, 2], [1, 4, 2, 2, 1, 1], [2, 4, 1, 2, 1, 1], [2, 2, 1, 1, 1, 4], [4, 1, 3, 1, 1, 1], [2, 4, 1, 1, 1, 2], [1, 3, 4, 1, 1, 1], [1, 1, 1, 2, 4, 2], [1, 2, 1, 1, 4, 2], [1, 2, 1, 2, 4, 1], [1, 1, 4, 2, 1, 2], [1, 2, 4, 1, 1, 2], [1, 2, 4, 2, 1, 1], [4, 1, 1, 2, 1, 2], [4, 2, 1, 1, 1, 2], [4, 2, 1, 2, 1, 1], [2, 1, 2, 1, 4, 1], [2, 1, 4, 1, 2, 1], [4, 1, 2, 1, 2, 1], [1, 1, 1, 1, 4, 3], [1, 1, 1, 3, 4, 1], [1, 3, 1, 1, 4, 1], [1, 1, 4, 1, 1, 3], [1, 1, 4, 3, 1, 1], [4, 1, 1, 1, 1, 3], [4, 1, 1, 3, 1, 1], [1, 1, 3, 1, 4, 1], [1, 1, 4, 1, 3, 1], [3, 1, 1, 1, 4, 1], [4, 1, 1, 1, 3, 1], [2, 1, 1, 4, 1, 2], [2, 1, 1, 2, 1, 4], [2, 1, 1, 2, 3, 2], [2, 3, 3, 1, 1, 1, 2] ]}, SINGLE_CODE_ERROR: {value: 1}, AVG_CODE_ERROR: {value: 0.5}, FORMAT: {value: "code_128", writeable: false} }; Code128Reader.prototype = Object.create(BarcodeReader.prototype, properties); Code128Reader.prototype.constructor = Code128Reader; Code128Reader.prototype._decodeCode = function(start) { var counter = [0, 0, 0, 0, 0, 0], i, self = this, offset = start, isWhite = !self._row[offset], counterPos = 0, bestMatch = { error: Number.MAX_VALUE, code: -1, start: start, end: start }, code, error, normalized; for ( i = offset; i < self._row.length; i++) { if (self._row[i] ^ isWhite) { counter[counterPos]++; } else { if (counterPos === counter.length - 1) { normalized = self._normalize(counter); if (normalized) { for (code = 0; code < self.CODE_PATTERN.length; code++) { error = self._matchPattern(normalized, self.CODE_PATTERN[code]); if (error < bestMatch.error) { bestMatch.code = code; bestMatch.error = error; } } bestMatch.end = i; return bestMatch; } } else { counterPos++; } counter[counterPos] = 1; isWhite = !isWhite; } } return null; }; Code128Reader.prototype._findStart = function() { var counter = [0, 0, 0, 0, 0, 0], i, self = this, offset = self._nextSet(self._row), isWhite = false, counterPos = 0, bestMatch = { error: Number.MAX_VALUE, code: -1, start: 0, end: 0 }, code, error, j, sum, normalized; for ( i = offset; i < self._row.length; i++) { if (self._row[i] ^ isWhite) { counter[counterPos]++; } else { if (counterPos === counter.length - 1) { sum = 0; for ( j = 0; j < counter.length; j++) { sum += counter[j]; } normalized = self._normalize(counter); if (normalized) { for (code = self.START_CODE_A; code <= self.START_CODE_C; code++) { error = self._matchPattern(normalized, self.CODE_PATTERN[code]); if (error < bestMatch.error) { bestMatch.code = code; bestMatch.error = error; } } if (bestMatch.error < self.AVG_CODE_ERROR) { bestMatch.start = i - sum; bestMatch.end = i; return bestMatch; } } for ( j = 0; j < 4; j++) { counter[j] = counter[j + 2]; } counter[4] = 0; counter[5] = 0; counterPos--; } else { counterPos++; } counter[counterPos] = 1; isWhite = !isWhite; } } return null; }; Code128Reader.prototype._decode = function() { var self = this, startInfo = self._findStart(), code = null, done = false, result = [], multiplier = 0, checksum = 0, codeset, rawResult = [], decodedCodes = [], shiftNext = false, unshift, removeLastCharacter = true; if (startInfo === null) { return null; } code = { code: startInfo.code, start: startInfo.start, end: startInfo.end }; decodedCodes.push(code); checksum = code.code; switch (code.code) { case self.START_CODE_A: codeset = self.CODE_A; break; case self.START_CODE_B: codeset = self.CODE_B; break; case self.START_CODE_C: codeset = self.CODE_C; break; default: return null; } while (!done) { unshift = shiftNext; shiftNext = false; code = self._decodeCode(code.end); if (code !== null) { if (code.code !== self.STOP_CODE) { removeLastCharacter = true; } if (code.code !== self.STOP_CODE) { rawResult.push(code.code); multiplier++; checksum += multiplier * code.code; } decodedCodes.push(code); switch (codeset) { case self.CODE_A: if (code.code < 64) { result.push(String.fromCharCode(32 + code.code)); } else if (code.code < 96) { result.push(String.fromCharCode(code.code - 64)); } else { if (code.code !== self.STOP_CODE) { removeLastCharacter = false; } switch (code.code) { case self.CODE_SHIFT: shiftNext = true; codeset = self.CODE_B; break; case self.CODE_B: codeset = self.CODE_B; break; case self.CODE_C: codeset = self.CODE_C; break; case self.STOP_CODE: done = true; break; } } break; case self.CODE_B: if (code.code < 96) { result.push(String.fromCharCode(32 + code.code)); } else { if (code.code !== self.STOP_CODE) { removeLastCharacter = false; } switch (code.code) { case self.CODE_SHIFT: shiftNext = true; codeset = self.CODE_A; break; case self.CODE_A: codeset = self.CODE_A; break; case self.CODE_C: codeset = self.CODE_C; break; case self.STOP_CODE: done = true; break; } } break; case self.CODE_C: if (code.code < 100) { result.push(code.code < 10 ? "0" + code.code : code.code); } else { if (code.code !== self.STOP_CODE) { removeLastCharacter = false; } switch (code.code) { case self.CODE_A: codeset = self.CODE_A; break; case self.CODE_B: codeset = self.CODE_B; break; case self.STOP_CODE: done = true; break; } } break; } } else { done = true; } if (unshift) { codeset = codeset === self.CODE_A ? self.CODE_B : self.CODE_A; } } if (code === null) { return null; } code.end = self._nextUnset(self._row, code.end); if (!self._verifyTrailingWhitespace(code)){ return null; } checksum -= multiplier * rawResult[rawResult.length - 1]; if (checksum % 103 !== rawResult[rawResult.length - 1]) { return null; } if (!result.length) { return null; } // remove last code from result (checksum) if (removeLastCharacter) { result.splice(result.length - 1, 1); } return { code: result.join(""), start: startInfo.start, end: code.end, codeset: codeset, startInfo: startInfo, decodedCodes: decodedCodes, endInfo: code }; }; BarcodeReader.prototype._verifyTrailingWhitespace = function(endInfo) { var self = this, trailingWhitespaceEnd; trailingWhitespaceEnd = endInfo.end + ((endInfo.end - endInfo.start) / 2); if (trailingWhitespaceEnd < self._row.length) { if (self._matchRange(endInfo.end, trailingWhitespaceEnd, 0)) { return endInfo; } } return null; }; export default Code128Reader;