mirror of
https://github.com/zxing/zxing.git
synced 2024-11-10 04:54:04 -08:00
b6128650bb
git-svn-id: https://zxing.googlecode.com/svn/trunk@1951 59b500cc-1b3d-0410-9834-0bbf25fbcc57
110 lines
4 KiB
C#
Executable file
110 lines
4 KiB
C#
Executable file
/*
|
|
* Copyright 2008 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.
|
|
*/
|
|
using System;
|
|
using BarcodeFormat = com.google.zxing.BarcodeFormat;
|
|
using DecodeHintType = com.google.zxing.DecodeHintType;
|
|
using ReaderException = com.google.zxing.ReaderException;
|
|
using Result = com.google.zxing.Result;
|
|
using BitArray = com.google.zxing.common.BitArray;
|
|
namespace com.google.zxing.oned
|
|
{
|
|
|
|
/// <summary> <p>A reader that can read all available UPC/EAN formats. If a caller wants to try to
|
|
/// read all such formats, it is most efficient to use this implementation rather than invoke
|
|
/// individual readers.</p>
|
|
///
|
|
/// </summary>
|
|
/// <author> Sean Owen
|
|
/// </author>
|
|
/// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source
|
|
/// </author>
|
|
public sealed class MultiFormatUPCEANReader:OneDReader
|
|
{
|
|
|
|
//UPGRADE_NOTE: Final was removed from the declaration of 'readers '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
|
|
private System.Collections.ArrayList readers;
|
|
|
|
public MultiFormatUPCEANReader(System.Collections.Hashtable hints)
|
|
{
|
|
System.Collections.ArrayList possibleFormats = hints == null?null:(System.Collections.ArrayList) hints[DecodeHintType.POSSIBLE_FORMATS];
|
|
readers = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(10));
|
|
if (possibleFormats != null)
|
|
{
|
|
if (possibleFormats.Contains(BarcodeFormat.EAN_13))
|
|
{
|
|
readers.Add(new EAN13Reader());
|
|
}
|
|
else if (possibleFormats.Contains(BarcodeFormat.UPC_A))
|
|
{
|
|
readers.Add(new UPCAReader());
|
|
}
|
|
if (possibleFormats.Contains(BarcodeFormat.EAN_8))
|
|
{
|
|
readers.Add(new EAN8Reader());
|
|
}
|
|
if (possibleFormats.Contains(BarcodeFormat.UPC_E))
|
|
{
|
|
readers.Add(new UPCEReader());
|
|
}
|
|
}
|
|
if ((readers.Count == 0))
|
|
{
|
|
readers.Add(new EAN13Reader());
|
|
// UPC-A is covered by EAN-13
|
|
readers.Add(new EAN8Reader());
|
|
readers.Add(new UPCEReader());
|
|
}
|
|
}
|
|
|
|
public override Result decodeRow(int rowNumber, BitArray row, System.Collections.Hashtable hints)
|
|
{
|
|
// Compute this location once and reuse it on multiple implementations
|
|
int[] startGuardPattern = UPCEANReader.findStartGuardPattern(row);
|
|
int size = readers.Count;
|
|
for (int i = 0; i < size; i++)
|
|
{
|
|
UPCEANReader reader = (UPCEANReader) readers[i];
|
|
Result result;
|
|
try
|
|
{
|
|
result = reader.decodeRow(rowNumber, row, startGuardPattern, hints);
|
|
}
|
|
catch (ReaderException)
|
|
{
|
|
continue;
|
|
}
|
|
// Special case: a 12-digit code encoded in UPC-A is identical to a "0"
|
|
// followed by those 12 digits encoded as EAN-13. Each will recognize such a code,
|
|
// UPC-A as a 12-digit string and EAN-13 as a 13-digit string starting with "0".
|
|
// Individually these are correct and their readers will both read such a code
|
|
// and correctly call it EAN-13, or UPC-A, respectively.
|
|
//
|
|
// In this case, if we've been looking for both types, we'd like to call it
|
|
// a UPC-A code. But for efficiency we only run the EAN-13 decoder to also read
|
|
// UPC-A. So we special case it here, and convert an EAN-13 result to a UPC-A
|
|
// result if appropriate.
|
|
if (result.BarcodeFormat.Equals(BarcodeFormat.EAN_13) && result.Text[0] == '0')
|
|
{
|
|
return new Result(result.Text.Substring(1), null, result.ResultPoints, BarcodeFormat.UPC_A);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
throw ReaderException.Instance;
|
|
}
|
|
}
|
|
}
|