142 lines
3.7 KiB
C#
142 lines
3.7 KiB
C#
/******************************************************************************
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* The MIT License
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* Copyright (c) 2003 Novell Inc. www.novell.com
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the Software), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*******************************************************************************/
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//
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// Novell.Directory.Ldap.Asn1.Asn1Length.cs
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//
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// Author:
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// Sunil Kumar (Sunilk@novell.com)
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//
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// (C) 2003 Novell, Inc (http://www.novell.com)
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//
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using System;
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namespace Novell.Directory.Ldap.Asn1
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{
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/// <summary> This class provides a means to manipulate ASN.1 Length's. It will
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/// be used by Asn1Encoder's and Asn1Decoder's by composition.
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/// </summary>
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public class Asn1Length
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{
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/// <summary> Returns the length of this Asn1Length.</summary>
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virtual public int Length
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{
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get
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{
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return length;
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}
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}
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/// <summary> Returns the encoded length of this Asn1Length.</summary>
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virtual public int EncodedLength
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{
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get
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{
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return encodedLength;
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}
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}
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/* Private variables
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*/
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private int length;
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private int encodedLength;
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/* Constructors for Asn1Length
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*/
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/// <summary> Constructs an empty Asn1Length. Values are added by calling reset</summary>
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public Asn1Length()
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{
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}
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/// <summary> Constructs an Asn1Length</summary>
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public Asn1Length(int length)
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{
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this.length = length;
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}
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/// <summary> Constructs an Asn1Length object by decoding data from an
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/// input stream.
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///
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/// </summary>
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/// <param name="in">A byte stream that contains the encoded ASN.1
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///
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/// </param>
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public Asn1Length(System.IO.Stream in_Renamed)
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{
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int r = in_Renamed.ReadByte();
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encodedLength++;
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if (r == 0x80)
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length = - 1;
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else if (r < 0x80)
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length = r;
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else
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{
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length = 0;
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for (r = r & 0x7F; r > 0; r--)
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{
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int part = in_Renamed.ReadByte();
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encodedLength++;
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if (part < 0)
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throw new System.IO.EndOfStreamException("BERDecoder: decode: EOF in Asn1Length");
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length = (length << 8) + part;
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}
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}
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}
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/// <summary> Resets an Asn1Length object by decoding data from an
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/// input stream.
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///
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/// Note: this was added for optimization of Asn1.LBERdecoder.decode()
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///
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/// </summary>
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/// <param name="in">A byte stream that contains the encoded ASN.1
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///
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/// </param>
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public void reset(System.IO.Stream in_Renamed)
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{
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encodedLength = 0;
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int r = in_Renamed.ReadByte();
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encodedLength++;
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if (r == 0x80)
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length = - 1;
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else if (r < 0x80)
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length = r;
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else
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{
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length = 0;
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for (r = r & 0x7F; r > 0; r--)
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{
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int part = in_Renamed.ReadByte();
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encodedLength++;
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if (part < 0)
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throw new System.IO.EndOfStreamException("BERDecoder: decode: EOF in Asn1Length");
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length = (length << 8) + part;
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}
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}
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}
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}
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}
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