// Stream extension class.// Copyright (C) 2008-2010 Malcolm Crowe, Lex Li, and other contributors.// // Permission is hereby granted, free of charge, to any person obtaining a copy of this// software and associated documentation files (the "Software"), to deal in the Software// without restriction, including without limitation the rights to use, copy, modify, merge,// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons// to whom the Software is furnished to do so, subject to the following conditions:// // The above copyright notice and this permission notice shall be included in all copies or// substantial portions of the Software.// // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER// DEALINGS IN THE SOFTWARE.using System;using System.Collections.Generic;using System.IO;namespace GSF.Net.Snmp{ /// <summary> /// Stream extension class. /// </summary> public static class StreamExtension { internal static Tuple<int, byte[]> ReadPayloadLength(this Stream stream) { if (stream == null) { throw new ArgumentNullException(nameof(stream)); } List<byte> list = new List<byte>(); int first = stream.ReadByte(); byte firstByte = (byte)first; if ((firstByte & 0x80) == 0) { return new Tuple<int, byte[]>(first, new[] { firstByte }); } list.Add(firstByte); int result = 0; int octets = firstByte & 0x7f; for (int j = 0; j < octets; j++) { int n = stream.ReadByte(); if (n == -1) { throw new SnmpException("BER end of file"); } byte nextByte = (byte)n; result = (result << 8) + nextByte; list.Add(nextByte); } return new Tuple<int, byte[]>(result, list.ToArray()); } internal static void IgnoreBytes(this Stream stream, int length) { if (stream == null) { throw new ArgumentNullException(nameof(stream)); } byte[] bytes = new byte[length]; stream.Read(bytes, 0, length); } internal static void AppendBytes(this Stream stream, SnmpType typeCode, byte[] length, byte[] raw) { if (stream == null) { throw new ArgumentNullException(nameof(stream)); } if (raw == null) { throw new ArgumentNullException(nameof(raw)); } stream.WriteByte((byte)typeCode); if (length == null) { length = raw.Length.WritePayloadLength(); } stream.Write(length, 0, length.Length); stream.Write(raw, 0, raw.Length); } }}
// Stream extension class.
// Copyright (C) 2008-2010 Malcolm Crowe, Lex Li, and other contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using System;
using System.Collections.Generic;
using System.IO;
namespace GSF.Net.Snmp
{
/// <summary>
/// Stream extension class.
/// </summary>
public static class StreamExtension
{
internal static Tuple<int, byte[]> ReadPayloadLength(this Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
List<byte> list = new List<byte>();
int first = stream.ReadByte();
byte firstByte = (byte)first;
if ((firstByte & 0x80) == 0)
{
return new Tuple<int, byte[]>(first, new[] { firstByte });
}
list.Add(firstByte);
int result = 0;
int octets = firstByte & 0x7f;
for (int j = 0; j < octets; j++)
{
int n = stream.ReadByte();
if (n == -1)
{
throw new SnmpException("BER end of file");
}
byte nextByte = (byte)n;
result = (result << 8) + nextByte;
list.Add(nextByte);
}
return new Tuple<int, byte[]>(result, list.ToArray());
}
internal static void IgnoreBytes(this Stream stream, int length)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
byte[] bytes = new byte[length];
stream.Read(bytes, 0, length);
}
internal static void AppendBytes(this Stream stream, SnmpType typeCode, byte[] length, byte[] raw)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
if (raw == null)
{
throw new ArgumentNullException(nameof(raw));
}
stream.WriteByte((byte)typeCode);
if (length == null)
{
length = raw.Length.WritePayloadLength();
}
stream.Write(length, 0, length.Length);
stream.Write(raw, 0, raw.Length);
}
}
}