zxing/csharp/client/result/optional/NDEFTextResultParser.cs
srowen d4efd44fb0 New C# port from Suraj Supekar
git-svn-id: https://zxing.googlecode.com/svn/trunk@1202 59b500cc-1b3d-0410-9834-0bbf25fbcc57
2010-02-05 19:52:53 +00:00

65 lines
2.2 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 Result = com.google.zxing.Result;
using TextParsedResult = com.google.zxing.client.result.TextParsedResult;
namespace com.google.zxing.client.result.optional
{
/// <summary> Recognizes an NDEF message that encodes text according to the
/// "Text Record Type Definition" specification.
///
/// </summary>
/// <author> Sean Owen
/// </author>
/// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source
/// </author>
sealed class NDEFTextResultParser:AbstractNDEFResultParser
{
public static TextParsedResult parse(Result result)
{
sbyte[] bytes = result.RawBytes;
if (bytes == null)
{
return null;
}
NDEFRecord ndefRecord = NDEFRecord.readRecord(bytes, 0);
if (ndefRecord == null || !ndefRecord.MessageBegin || !ndefRecord.MessageEnd)
{
return null;
}
if (!ndefRecord.Type.Equals(NDEFRecord.TEXT_WELL_KNOWN_TYPE))
{
return null;
}
System.String[] languageText = decodeTextPayload(ndefRecord.Payload);
return new TextParsedResult(languageText[0], languageText[1]);
}
internal static System.String[] decodeTextPayload(sbyte[] payload)
{
sbyte statusByte = payload[0];
bool isUTF16 = (statusByte & 0x80) != 0;
int languageLength = statusByte & 0x1F;
// language is always ASCII-encoded:
System.String language = bytesToString(payload, 1, languageLength, "US-ASCII");
System.String encoding = isUTF16?"UTF-16":"UTF8";
System.String text = bytesToString(payload, 1 + languageLength, payload.Length - languageLength - 1, encoding);
return new System.String[]{language, text};
}
}
}