2 * MultiFormatUPCEANReader.cpp
5 * Copyright 2010 ZXing authors All rights reserved.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
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19 #include "MultiFormatUPCEANReader.h"
21 #include <zxing/oned/EAN13Reader.h>
22 #include <zxing/oned/EAN8Reader.h>
23 #include <zxing/oned/UPCEReader.h>
24 #include <zxing/oned/UPCAReader.h>
25 #include <zxing/oned/OneDResultPoint.h>
26 #include <zxing/common/Array.h>
27 #include <zxing/ReaderException.h>
33 MultiFormatUPCEANReader::MultiFormatUPCEANReader(DecodeHints hints) : readers() {
34 if (hints.containsFormat(BarcodeFormat_EAN_13)) {
35 readers.push_back(Ref<OneDReader>(new EAN13Reader()));
36 } else if (hints.containsFormat(BarcodeFormat_UPC_A)) {
37 readers.push_back(Ref<OneDReader>(new UPCAReader()));
39 if (hints.containsFormat(BarcodeFormat_EAN_8)) {
40 readers.push_back(Ref<OneDReader>(new EAN8Reader()));
42 if (hints.containsFormat(BarcodeFormat_UPC_E)) {
43 readers.push_back(Ref<OneDReader>(new UPCEReader()));
45 if (readers.size() == 0) {
46 readers.push_back(Ref<OneDReader>(new EAN13Reader()));
47 // UPC-A is covered by EAN-13
48 readers.push_back(Ref<OneDReader>(new EAN8Reader()));
49 readers.push_back(Ref<OneDReader>(new UPCEReader()));
53 Ref<Result> MultiFormatUPCEANReader::decodeRow(int rowNumber, Ref<BitArray> row) {
54 // Compute this location once and reuse it on multiple implementations
55 int size = readers.size();
56 for (int i = 0; i < size; i++) {
57 Ref<OneDReader> reader = readers[i];
58 Ref<Result> result = reader->decodeRow(rowNumber, row);
63 // Special case: a 12-digit code encoded in UPC-A is identical to a "0"
64 // followed by those 12 digits encoded as EAN-13. Each will recognize such a code,
65 // UPC-A as a 12-digit string and EAN-13 as a 13-digit string starting with "0".
66 // Individually these are correct and their readers will both read such a code
67 // and correctly call it EAN-13, or UPC-A, respectively.
69 // In this case, if we've been looking for both types, we'd like to call it
70 // a UPC-A code. But for efficiency we only run the EAN-13 decoder to also read
71 // UPC-A. So we special case it here, and convert an EAN-13 result to a UPC-A
72 // result if appropriate.
73 if (result->getBarcodeFormat() == BarcodeFormat_EAN_13) {
74 const std::string& text = (result->getText())->getText();
76 Ref<String> resultString(new String(text.substr(1)));
77 Ref<Result> res(new Result(resultString, result->getRawBytes(),
78 result->getResultPoints(), BarcodeFormat_UPC_A));