zxing/csharp/client/result/optional/NDEFRecord.cs

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/*
* 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;
namespace com.google.zxing.client.result.optional
{
/// <summary> <p>Represents a record in an NDEF message. This class only supports certain types
/// of records -- namely, non-chunked records, where ID length is omitted, and only
/// "short records".</p>
///
/// </summary>
/// <author> Sean Owen
/// </author>
/// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source
/// </author>
sealed class NDEFRecord
{
internal bool MessageBegin
{
get
{
return (header & 0x80) != 0;
}
}
internal bool MessageEnd
{
get
{
return (header & 0x40) != 0;
}
}
internal System.String Type
{
get
{
return type;
}
}
internal sbyte[] Payload
{
get
{
return payload;
}
}
internal int TotalRecordLength
{
get
{
return totalRecordLength;
}
}
private const int SUPPORTED_HEADER_MASK = 0x3F; // 0 0 1 1 1 111 (the bottom 6 bits matter)
private const int SUPPORTED_HEADER = 0x11; // 0 0 0 1 0 001
public const System.String TEXT_WELL_KNOWN_TYPE = "T";
public const System.String URI_WELL_KNOWN_TYPE = "U";
public const System.String SMART_POSTER_WELL_KNOWN_TYPE = "Sp";
public const System.String ACTION_WELL_KNOWN_TYPE = "act";
//UPGRADE_NOTE: Final was removed from the declaration of 'header '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
private int header;
//UPGRADE_NOTE: Final was removed from the declaration of 'type '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
private System.String type;
//UPGRADE_NOTE: Final was removed from the declaration of 'payload '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
private sbyte[] payload;
//UPGRADE_NOTE: Final was removed from the declaration of 'totalRecordLength '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
private int totalRecordLength;
private NDEFRecord(int header, System.String type, sbyte[] payload, int totalRecordLength)
{
this.header = header;
this.type = type;
this.payload = payload;
this.totalRecordLength = totalRecordLength;
}
internal static NDEFRecord readRecord(sbyte[] bytes, int offset)
{
int header = bytes[offset] & 0xFF;
// Does header match what we support in the bits we care about?
// XOR figures out where we differ, and if any of those are in the mask, fail
if (((header ^ SUPPORTED_HEADER) & SUPPORTED_HEADER_MASK) != 0)
{
return null;
}
int typeLength = bytes[offset + 1] & 0xFF;
int payloadLength = bytes[offset + 2] & 0xFF;
System.String type = AbstractNDEFResultParser.bytesToString(bytes, offset + 3, typeLength, "US-ASCII");
sbyte[] payload = new sbyte[payloadLength];
Array.Copy(bytes, offset + 3 + typeLength, payload, 0, payloadLength);
return new NDEFRecord(header, type, payload, 3 + typeLength + payloadLength);
}
}
}