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88 lines
3.5 KiB
C++
88 lines
3.5 KiB
C++
/*
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* MultiFormatUPCEANReader.cpp
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* ZXing
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*
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* Copyright 2010 ZXing authors All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "MultiFormatUPCEANReader.h"
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#include <zxing/oned/EAN13Reader.h>
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#include <zxing/oned/EAN8Reader.h>
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#include <zxing/oned/UPCEReader.h>
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#include <zxing/oned/UPCAReader.h>
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#include <zxing/oned/OneDResultPoint.h>
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#include <zxing/common/Array.h>
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#include <zxing/ReaderException.h>
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#include <math.h>
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namespace zxing {
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namespace oned {
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MultiFormatUPCEANReader::MultiFormatUPCEANReader(DecodeHints hints) : readers() {
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if (hints.containsFormat(BarcodeFormat_EAN_13)) {
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readers.push_back(Ref<OneDReader>(new EAN13Reader()));
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} else if (hints.containsFormat(BarcodeFormat_UPC_A)) {
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readers.push_back(Ref<OneDReader>(new UPCAReader()));
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}
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if (hints.containsFormat(BarcodeFormat_EAN_8)) {
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readers.push_back(Ref<OneDReader>(new EAN8Reader()));
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}
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if (hints.containsFormat(BarcodeFormat_UPC_E)) {
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readers.push_back(Ref<OneDReader>(new UPCEReader()));
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}
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if (readers.size() == 0) {
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readers.push_back(Ref<OneDReader>(new EAN13Reader()));
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// UPC-A is covered by EAN-13
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readers.push_back(Ref<OneDReader>(new EAN8Reader()));
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readers.push_back(Ref<OneDReader>(new UPCEReader()));
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}
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}
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Ref<Result> MultiFormatUPCEANReader::decodeRow(int rowNumber, Ref<BitArray> row) {
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// Compute this location once and reuse it on multiple implementations
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int size = readers.size();
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for (int i = 0; i < size; i++) {
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Ref<OneDReader> reader = readers[i];
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Ref<Result> result = reader->decodeRow(rowNumber, row);
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if (result.empty()) {
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continue;
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}
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// Special case: a 12-digit code encoded in UPC-A is identical to a "0"
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// followed by those 12 digits encoded as EAN-13. Each will recognize such a code,
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// UPC-A as a 12-digit string and EAN-13 as a 13-digit string starting with "0".
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// Individually these are correct and their readers will both read such a code
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// and correctly call it EAN-13, or UPC-A, respectively.
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//
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// In this case, if we've been looking for both types, we'd like to call it
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// a UPC-A code. But for efficiency we only run the EAN-13 decoder to also read
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// UPC-A. So we special case it here, and convert an EAN-13 result to a UPC-A
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// result if appropriate.
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if (result->getBarcodeFormat() == BarcodeFormat_EAN_13) {
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const std::string& text = (result->getText())->getText();
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if (text[0] == '0') {
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Ref<String> resultString(new String(text.substr(1)));
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Ref<Result> res(new Result(resultString, result->getRawBytes(),
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result->getResultPoints(), BarcodeFormat_UPC_A));
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return res;
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}
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}
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return result;
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}
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return Ref<Result>();
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}
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}
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}
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