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https://github.com/zxing/zxing.git
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7854d30103
git-svn-id: https://zxing.googlecode.com/svn/trunk@817 59b500cc-1b3d-0410-9834-0bbf25fbcc57
82 lines
3.7 KiB
C#
Executable file
82 lines
3.7 KiB
C#
Executable file
/*
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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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namespace com.google.zxing.oned
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{
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/**
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* @author dswitkin@google.com (Daniel Switkin)
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* @author Sean Owen
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*/
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using System.Text;
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using com.google.zxing.common;
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public sealed class MultiFormatUPCEANReader : AbstractOneDReader
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{
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private System.Collections.ArrayList readers;
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public MultiFormatUPCEANReader(System.Collections.Hashtable hints) {
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System.Collections.ArrayList possibleFormats = hints == null ? null : (System.Collections.ArrayList) hints[DecodeHintType.POSSIBLE_FORMATS];
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readers = new System.Collections.ArrayList();
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if (possibleFormats != null) {
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if (possibleFormats.Contains(BarcodeFormat.EAN_13)) {
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readers.Add(new EAN13Reader());
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} else if (possibleFormats.Contains(BarcodeFormat.UPC_A)) {
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readers.Add(new UPCAReader());
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}
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if (possibleFormats.Contains(BarcodeFormat.EAN_8)) {
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readers.Add(new EAN8Reader());
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}
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if (possibleFormats.Contains(BarcodeFormat.UPC_E)) {
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readers.Add(new UPCEReader());
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}
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}
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if (readers.Count==0) {
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readers.Add(new EAN13Reader());
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// UPC-A is covered by EAN-13
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readers.Add(new EAN8Reader());
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readers.Add(new UPCEReader());
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}
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}
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public override Result decodeRow(int rowNumber, BitArray row, System.Collections.Hashtable hints) {
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// Compute this location once and reuse it on multiple implementations
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int[] startGuardPattern = AbstractUPCEANReader.findStartGuardPattern(row);
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int size = readers.Count;
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for (int i = 0; i < size; i++) {
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UPCEANReader reader = (UPCEANReader) readers[i];
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Result result;
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try {
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result = reader.decodeRow(rowNumber, row, startGuardPattern);
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} catch (ReaderException re) {
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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().Equals(BarcodeFormat.EAN_13) && result.getText()[0] == '0') {
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return new Result(result.getText().Substring(1), null, result.getResultPoints(), BarcodeFormat.UPC_A);
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}
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return result;
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}
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throw new ReaderException();
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}
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}
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} |