| /* |
| * Copyright (C) 2010 ZXing authors |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.google.zxing.oned; |
| |
| import com.google.zxing.BarcodeFormat; |
| import com.google.zxing.NotFoundException; |
| import com.google.zxing.Result; |
| import com.google.zxing.ResultMetadataType; |
| import com.google.zxing.ResultPoint; |
| import com.google.zxing.common.BitArray; |
| |
| import java.util.EnumMap; |
| import java.util.Map; |
| |
| /** |
| * @see UPCEANExtension2Support |
| */ |
| final class UPCEANExtension5Support { |
| |
| private static final int[] CHECK_DIGIT_ENCODINGS = { |
| 0x18, 0x14, 0x12, 0x11, 0x0C, 0x06, 0x03, 0x0A, 0x09, 0x05 |
| }; |
| |
| private final int[] decodeMiddleCounters = new int[4]; |
| private final StringBuilder decodeRowStringBuffer = new StringBuilder(); |
| |
| Result decodeRow(int rowNumber, BitArray row, int[] extensionStartRange) throws NotFoundException { |
| |
| StringBuilder result = decodeRowStringBuffer; |
| result.setLength(0); |
| int end = decodeMiddle(row, extensionStartRange, result); |
| |
| String resultString = result.toString(); |
| Map<ResultMetadataType,Object> extensionData = parseExtensionString(resultString); |
| |
| Result extensionResult = |
| new Result(resultString, |
| null, |
| new ResultPoint[] { |
| new ResultPoint((extensionStartRange[0] + extensionStartRange[1]) / 2.0f, rowNumber), |
| new ResultPoint(end, rowNumber), |
| }, |
| BarcodeFormat.UPC_EAN_EXTENSION); |
| if (extensionData != null) { |
| extensionResult.putAllMetadata(extensionData); |
| } |
| return extensionResult; |
| } |
| |
| private int decodeMiddle(BitArray row, int[] startRange, StringBuilder resultString) throws NotFoundException { |
| int[] counters = decodeMiddleCounters; |
| counters[0] = 0; |
| counters[1] = 0; |
| counters[2] = 0; |
| counters[3] = 0; |
| int end = row.getSize(); |
| int rowOffset = startRange[1]; |
| |
| int lgPatternFound = 0; |
| |
| for (int x = 0; x < 5 && rowOffset < end; x++) { |
| int bestMatch = UPCEANReader.decodeDigit(row, counters, rowOffset, UPCEANReader.L_AND_G_PATTERNS); |
| resultString.append((char) ('0' + bestMatch % 10)); |
| for (int counter : counters) { |
| rowOffset += counter; |
| } |
| if (bestMatch >= 10) { |
| lgPatternFound |= 1 << (4 - x); |
| } |
| if (x != 4) { |
| // Read off separator if not last |
| rowOffset = row.getNextSet(rowOffset); |
| rowOffset = row.getNextUnset(rowOffset); |
| } |
| } |
| |
| if (resultString.length() != 5) { |
| throw NotFoundException.getNotFoundInstance(); |
| } |
| |
| int checkDigit = determineCheckDigit(lgPatternFound); |
| if (extensionChecksum(resultString.toString()) != checkDigit) { |
| throw NotFoundException.getNotFoundInstance(); |
| } |
| |
| return rowOffset; |
| } |
| |
| private static int extensionChecksum(CharSequence s) { |
| int length = s.length(); |
| int sum = 0; |
| for (int i = length - 2; i >= 0; i -= 2) { |
| sum += s.charAt(i) - '0'; |
| } |
| sum *= 3; |
| for (int i = length - 1; i >= 0; i -= 2) { |
| sum += s.charAt(i) - '0'; |
| } |
| sum *= 3; |
| return sum % 10; |
| } |
| |
| private static int determineCheckDigit(int lgPatternFound) |
| throws NotFoundException { |
| for (int d = 0; d < 10; d++) { |
| if (lgPatternFound == CHECK_DIGIT_ENCODINGS[d]) { |
| return d; |
| } |
| } |
| throw NotFoundException.getNotFoundInstance(); |
| } |
| |
| /** |
| * @param raw raw content of extension |
| * @return formatted interpretation of raw content as a {@link Map} mapping |
| * one {@link ResultMetadataType} to appropriate value, or {@code null} if not known |
| */ |
| private static Map<ResultMetadataType,Object> parseExtensionString(String raw) { |
| if (raw.length() != 5) { |
| return null; |
| } |
| Object value = parseExtension5String(raw); |
| if (value == null) { |
| return null; |
| } |
| Map<ResultMetadataType,Object> result = new EnumMap<>(ResultMetadataType.class); |
| result.put(ResultMetadataType.SUGGESTED_PRICE, value); |
| return result; |
| } |
| |
| private static String parseExtension5String(String raw) { |
| String currency; |
| switch (raw.charAt(0)) { |
| case '0': |
| currency = "£"; |
| break; |
| case '5': |
| currency = "$"; |
| break; |
| case '9': |
| // Reference: http://www.jollytech.com |
| switch (raw) { |
| case "90000": |
| // No suggested retail price |
| return null; |
| case "99991": |
| // Complementary |
| return "0.00"; |
| case "99990": |
| return "Used"; |
| } |
| // Otherwise... unknown currency? |
| currency = ""; |
| break; |
| default: |
| currency = ""; |
| break; |
| } |
| int rawAmount = Integer.parseInt(raw.substring(1)); |
| String unitsString = String.valueOf(rawAmount / 100); |
| int hundredths = rawAmount % 100; |
| String hundredthsString = hundredths < 10 ? "0" + hundredths : String.valueOf(hundredths); |
| return currency + unitsString + '.' + hundredthsString; |
| } |
| |
| } |