C# Buffer.GetByte方法代码示例

 /** Picture:
  * @param b payload buffer
  * @param d decoder of the picture
  *
  * The b buffer should only point to the payload data section of
  * the picture (not the header). The only methods that would ever need
  * to be called are parse(), decode(), and getImage(). However,
  * one should check wether the error variable is set before and after
  * calling a method. One should not call them in any other order than that
  * just specified. Each can be called without arguments and should not be
  * called twice. */
 public Picture(Buffer b, Decoder d)
 {
     num = b.GetInt(13);
     code = b.GetByte(4);
     buf = b;
     dec = d;
     par = new Parameters(code);
     coeffs = new SubBand[3][];
     coeffs[0] = new SubBand[19];
     coeffs[1] = new SubBand[19];
     coeffs[2] = new SubBand[19];
     motion_buffers = new Buffer[9];
     status = Decoder.Status.NULL;
 }

		/// <exception cref="System.Exception"></exception>
		private void Send_kexinit()
		{
			if (in_kex)
			{
				return;
			}
			string cipherc2s = GetConfig("cipher.c2s");
			string ciphers2c = GetConfig("cipher.s2c");
			string[] not_available = CheckCiphers(GetConfig("CheckCiphers"));
			if (not_available != null && not_available.Length > 0)
			{
				cipherc2s = Util.DiffString(cipherc2s, not_available);
				ciphers2c = Util.DiffString(ciphers2c, not_available);
				if (cipherc2s == null || ciphers2c == null)
				{
					throw new JSchException("There are not any available ciphers.");
				}
			}
			in_kex = true;
			kex_start_time = Runtime.CurrentTimeMillis();
			// byte      SSH_MSG_KEXINIT(20)
			// byte[16]  cookie (random bytes)
			// string    kex_algorithms
			// string    server_host_key_algorithms
			// string    encryption_algorithms_client_to_server
			// string    encryption_algorithms_server_to_client
			// string    mac_algorithms_client_to_server
			// string    mac_algorithms_server_to_client
			// string    compression_algorithms_client_to_server
			// string    compression_algorithms_server_to_client
			// string    languages_client_to_server
			// string    languages_server_to_client
			Buffer buf = new Buffer();
			// send_kexinit may be invoked
			Packet packet = new Packet(buf);
			// by user thread.
			packet.Reset();
			buf.PutByte(unchecked((byte)SSH_MSG_KEXINIT));
			lock (random)
			{
				random.Fill(buf.buffer, buf.index, 16);
				buf.Skip(16);
			}
			buf.PutString(Util.Str2byte(GetConfig("kex")));
			buf.PutString(Util.Str2byte(GetConfig("server_host_key")));
			buf.PutString(Util.Str2byte(cipherc2s));
			buf.PutString(Util.Str2byte(ciphers2c));
			buf.PutString(Util.Str2byte(GetConfig("mac.c2s")));
			buf.PutString(Util.Str2byte(GetConfig("mac.s2c")));
			buf.PutString(Util.Str2byte(GetConfig("compression.c2s")));
			buf.PutString(Util.Str2byte(GetConfig("compression.s2c")));
			buf.PutString(Util.Str2byte(GetConfig("lang.c2s")));
			buf.PutString(Util.Str2byte(GetConfig("lang.s2c")));
			buf.PutByte(unchecked((byte)0));
			buf.PutInt(0);
			buf.SetOffSet(5);
			I_C = new byte[buf.GetLength()];
			buf.GetByte(I_C);
			Write(packet);
			if (JSch.GetLogger().IsEnabled(Logger.INFO))
			{
				JSch.GetLogger().Log(Logger.INFO, "SSH_MSG_KEXINIT sent");
			}
		}

		/// <exception cref="System.Exception"></exception>
		private KeyExchange Receive_kexinit(Buffer buf)
		{
			int j = buf.GetInt();
			if (j != buf.GetLength())
			{
				// packet was compressed and
				buf.GetByte();
				// j is the size of deflated packet.
				I_S = new byte[buf.index - 5];
			}
			else
			{
				I_S = new byte[j - 1 - buf.GetByte()];
			}
			System.Array.Copy(buf.buffer, buf.s, I_S, 0, I_S.Length);
			if (!in_kex)
			{
				// We are in rekeying activated by the remote!
				Send_kexinit();
			}
			guess = KeyExchange.Guess(I_S, I_C);
			if (guess == null)
			{
				throw new JSchException("Algorithm negotiation fail");
			}
			if (!isAuthed && (guess[KeyExchange.PROPOSAL_ENC_ALGS_CTOS].Equals("none") || (guess
				[KeyExchange.PROPOSAL_ENC_ALGS_STOC].Equals("none"))))
			{
				throw new JSchException("NONE Cipher should not be chosen before authentification is successed."
					);
			}
			KeyExchange kex = null;
			try
			{
				Type c = Sharpen.Runtime.GetType(GetConfig(guess[KeyExchange.PROPOSAL_KEX_ALGS]));
				kex = (KeyExchange)(System.Activator.CreateInstance(c));
			}
			catch (Exception e)
			{
				throw new JSchException(e.ToString(), e);
			}
			kex.Init(this, V_S, V_C, I_S, I_C);
			return kex;
		}

		public virtual void Run()
		{
			thread = this;
			byte[] foo;
			Buffer buf = new Buffer();
			Packet packet = new Packet(buf);
			int i = 0;
			Channel channel;
			int[] start = new int[1];
			int[] length = new int[1];
			KeyExchange kex = null;
			int stimeout = 0;
			try
			{
				while (isConnected && thread != null)
				{
					try
					{
						buf = Read(buf);
						stimeout = 0;
					}
					catch (ThreadInterruptedException ee)
					{
						if (!in_kex && stimeout < serverAliveCountMax)
						{
							SendKeepAliveMsg();
							stimeout++;
							continue;
						}
						throw;
					}
					int msgType = buf.GetCommand() & unchecked((int)(0xff));
					if (kex != null && kex.GetState() == msgType)
					{
						kex_start_time = Runtime.CurrentTimeMillis();
						bool result = kex.Next(buf);
						if (!result)
						{
							throw new JSchException("verify: " + result);
						}
						continue;
					}
					switch (msgType)
					{
						case SSH_MSG_KEXINIT:
						{
							//System.err.println("KEXINIT");
							kex = Receive_kexinit(buf);
							break;
						}

						case SSH_MSG_NEWKEYS:
						{
							//System.err.println("NEWKEYS");
							Send_newkeys();
							Receive_newkeys(buf, kex);
							kex = null;
							break;
						}

						case SSH_MSG_CHANNEL_DATA:
						{
							buf.GetInt();
							buf.GetByte();
							buf.GetByte();
							i = buf.GetInt();
							channel = Channel.GetChannel(i, this);
							foo = buf.GetString(start, length);
							if (channel == null)
							{
								break;
							}
							if (length[0] == 0)
							{
								break;
							}
							try
							{
								channel.Write(foo, start[0], length[0]);
							}
							catch (Exception)
							{
								//System.err.println(e);
								try
								{
									channel.Disconnect();
								}
								catch (Exception)
								{
								}
								break;
							}
							int len = length[0];
							channel.SetLocalWindowSize(channel.lwsize - len);
							if (channel.lwsize < channel.lwsize_max / 2)
							{
								packet.Reset();
								buf.PutByte(unchecked((byte)SSH_MSG_CHANNEL_WINDOW_ADJUST));
								buf.PutInt(channel.GetRecipient());
								buf.PutInt(channel.lwsize_max - channel.lwsize);
//.........这里部分代码省略.........

 /* at this point, the buffer must be a complete dirac packet */
 private void Dispatch(Buffer b)
 {
     if (b.GetInt(5) != b.Size())
         throw new Exception("Incorrect buffer sizes");
     byte c = b.GetByte(4);
     switch(c) {
     case 0x00:
         VideoFormat tmp = new VideoFormat(b);
         if(format == null) {
         format = tmp;
         status = Status.OK;
         } else if(!tmp.Equals(format)) {
         throw new Exception("Stream Error: Inequal Video Formats");
         }
         break;
     case 0x10:
         status = Status.DONE;
         break;
     case 0x20:
     case 0x30:
         break;
     default:
         if(format == null)
             throw new Exception("Stream Error: Picture Before Header");
         Picture pic = new Picture(b, this);
         pic.Parse();
         inQueue.Push(pic);
         break;
     }
 }

		/// <exception cref="System.Exception"></exception>
		public override bool Next(Buffer _buf)
		{
			int i;
			int j;
			switch (state)
			{
				case SSH_MSG_KEX_DH_GEX_GROUP:
				{
					// byte  SSH_MSG_KEX_DH_GEX_GROUP(31)
					// mpint p, safe prime
					// mpint g, generator for subgroup in GF (p)
					_buf.GetInt();
					_buf.GetByte();
					j = _buf.GetByte();
					if (j != SSH_MSG_KEX_DH_GEX_GROUP)
					{
						System.Console.Error.WriteLine("type: must be SSH_MSG_KEX_DH_GEX_GROUP " + j);
						return false;
					}
					p = _buf.GetMPInt();
					g = _buf.GetMPInt();
					dh.SetP(p);
					dh.SetG(g);
					// The client responds with:
					// byte  SSH_MSG_KEX_DH_GEX_INIT(32)
					// mpint e <- g^x mod p
					//         x is a random number (1 < x < (p-1)/2)
					e = dh.GetE();
					packet.Reset();
					buf.PutByte(unchecked((byte)SSH_MSG_KEX_DH_GEX_INIT));
					buf.PutMPInt(e);
					session.Write(packet);
					if (JSch.GetLogger().IsEnabled(Logger.INFO))
					{
						JSch.GetLogger().Log(Logger.INFO, "SSH_MSG_KEX_DH_GEX_INIT sent");
						JSch.GetLogger().Log(Logger.INFO, "expecting SSH_MSG_KEX_DH_GEX_REPLY");
					}
					state = SSH_MSG_KEX_DH_GEX_REPLY;
					return true;
				}

				case SSH_MSG_KEX_DH_GEX_REPLY:
				{
					//break;
					// The server responds with:
					// byte      SSH_MSG_KEX_DH_GEX_REPLY(33)
					// string    server public host key and certificates (K_S)
					// mpint     f
					// string    signature of H
					j = _buf.GetInt();
					j = _buf.GetByte();
					j = _buf.GetByte();
					if (j != SSH_MSG_KEX_DH_GEX_REPLY)
					{
						System.Console.Error.WriteLine("type: must be SSH_MSG_KEX_DH_GEX_REPLY " + j);
						return false;
					}
					K_S = _buf.GetString();
					// K_S is server_key_blob, which includes ....
					// string ssh-dss
					// impint p of dsa
					// impint q of dsa
					// impint g of dsa
					// impint pub_key of dsa
					//System.err.print("K_S: "); dump(K_S, 0, K_S.length);
					byte[] f = _buf.GetMPInt();
					byte[] sig_of_H = _buf.GetString();
					dh.SetF(f);
					K = dh.GetK();
					//The hash H is computed as the HASH hash of the concatenation of the
					//following:
					// string    V_C, the client's version string (CR and NL excluded)
					// string    V_S, the server's version string (CR and NL excluded)
					// string    I_C, the payload of the client's SSH_MSG_KEXINIT
					// string    I_S, the payload of the server's SSH_MSG_KEXINIT
					// string    K_S, the host key
					// uint32    min, minimal size in bits of an acceptable group
					// uint32   n, preferred size in bits of the group the server should send
					// uint32    max, maximal size in bits of an acceptable group
					// mpint     p, safe prime
					// mpint     g, generator for subgroup
					// mpint     e, exchange value sent by the client
					// mpint     f, exchange value sent by the server
					// mpint     K, the shared secret
					// This value is called the exchange hash, and it is used to authenti-
					// cate the key exchange.
					buf.Reset();
					buf.PutString(V_C);
					buf.PutString(V_S);
					buf.PutString(I_C);
					buf.PutString(I_S);
					buf.PutString(K_S);
					buf.PutInt(min);
					buf.PutInt(preferred);
					buf.PutInt(max);
					buf.PutMPInt(p);
					buf.PutMPInt(g);
					buf.PutMPInt(e);
					buf.PutMPInt(f);
//.........这里部分代码省略.........

		/// <exception cref="System.IO.IOException"></exception>
		private ChannelHeader Header(Buffer buf, ChannelHeader header)
		{
			buf.Rewind();
			int i = Fill(buf.buffer, 0, 9);
			header.length = buf.GetInt() - 5;
			header.type = buf.GetByte() & unchecked((int)(0xff));
			header.rid = buf.GetInt();
			return header;
		}

//.........这里部分代码省略.........
							0));
						if (xd)
						{
							len--;
						}
						len--;
						continue;
					}
					if (buf[i_1] == '-')
					{
						break;
					}
					i_1++;
				}
				data = Util.FromBase64(buf, start, i_1 - start);
				if (data.Length > 4 && data[0] == unchecked((byte)unchecked((int)(0x3f))) && data
					[1] == unchecked((byte)unchecked((int)(0x6f))) && data[2] == unchecked((byte)unchecked(
					(int)(0xf9))) && data[3] == unchecked((byte)unchecked((int)(0xeb))))
				{
					// FSecure
					Buffer _buf = new Buffer(data);
					_buf.GetInt();
					// 0x3f6ff9be
					_buf.GetInt();
					byte[] _type = _buf.GetString();
					//System.err.println("type: "+new String(_type)); 
					byte[] _cipher = _buf.GetString();
					string cipher = Util.Byte2str(_cipher);
					//System.err.println("cipher: "+cipher); 
					if (cipher.Equals("3des-cbc"))
					{
						_buf.GetInt();
						byte[] foo = new byte[data.Length - _buf.GetOffSet()];
						_buf.GetByte(foo);
						data = foo;
						encrypted = true;
						throw new JSchException("unknown privatekey format: " + prvkey);
					}
					else
					{
						if (cipher.Equals("none"))
						{
							_buf.GetInt();
							_buf.GetInt();
							encrypted = false;
							byte[] foo = new byte[data.Length - _buf.GetOffSet()];
							_buf.GetByte(foo);
							data = foo;
						}
					}
				}
				if (pubkey != null)
				{
					try
					{
						file = new FilePath(pubkey);
						fis = new FileInputStream(pubkey);
						buf = new byte[(int)(file.Length())];
						len = 0;
						while (true)
						{
							i_1 = fis.Read(buf, len, buf.Length - len);
							if (i_1 <= 0)
							{
								break;
							}

		/// <exception cref="System.Exception"></exception>
		public override bool Next(Buffer _buf)
		{
			int i;
			int j;
			switch (state)
			{
				case SSH_MSG_KEXDH_REPLY:
				{
					// The server responds with:
					// byte      SSH_MSG_KEXDH_REPLY(31)
					// string    server public host key and certificates (K_S)
					// mpint     f
					// string    signature of H
					j = _buf.GetInt();
					j = _buf.GetByte();
					j = _buf.GetByte();
					if (j != 31)
					{
						System.Console.Error.WriteLine("type: must be 31 " + j);
						return false;
					}
					K_S = _buf.GetString();
					// K_S is server_key_blob, which includes ....
					// string ssh-dss
					// impint p of dsa
					// impint q of dsa
					// impint g of dsa
					// impint pub_key of dsa
					//System.err.print("K_S: "); //dump(K_S, 0, K_S.length);
					byte[] f = _buf.GetMPInt();
					byte[] sig_of_H = _buf.GetString();
					dh.SetF(f);
					K = dh.GetK();
					//The hash H is computed as the HASH hash of the concatenation of the
					//following:
					// string    V_C, the client's version string (CR and NL excluded)
					// string    V_S, the server's version string (CR and NL excluded)
					// string    I_C, the payload of the client's SSH_MSG_KEXINIT
					// string    I_S, the payload of the server's SSH_MSG_KEXINIT
					// string    K_S, the host key
					// mpint     e, exchange value sent by the client
					// mpint     f, exchange value sent by the server
					// mpint     K, the shared secret
					// This value is called the exchange hash, and it is used to authenti-
					// cate the key exchange.
					buf.Reset();
					buf.PutString(V_C);
					buf.PutString(V_S);
					buf.PutString(I_C);
					buf.PutString(I_S);
					buf.PutString(K_S);
					buf.PutMPInt(e);
					buf.PutMPInt(f);
					buf.PutMPInt(K);
					byte[] foo = new byte[buf.GetLength()];
					buf.GetByte(foo);
					sha.Update(foo, 0, foo.Length);
					H = sha.Digest();
					//System.err.print("H -> "); //dump(H, 0, H.length);
					i = 0;
					j = 0;
					j = ((K_S[i++] << 24) & unchecked((int)(0xff000000))) | ((K_S[i++] << 16) & unchecked(
						(int)(0x00ff0000))) | ((K_S[i++] << 8) & unchecked((int)(0x0000ff00))) | ((K_S[i
						++]) & unchecked((int)(0x000000ff)));
					string alg = Util.Byte2str(K_S, i, j);
					i += j;
					bool result = false;
					if (alg.Equals("ssh-rsa"))
					{
						byte[] tmp;
						byte[] ee;
						byte[] n;
						type = RSA;
						j = ((K_S[i++] << 24) & unchecked((int)(0xff000000))) | ((K_S[i++] << 16) & unchecked(
							(int)(0x00ff0000))) | ((K_S[i++] << 8) & unchecked((int)(0x0000ff00))) | ((K_S[i
							++]) & unchecked((int)(0x000000ff)));
						tmp = new byte[j];
						System.Array.Copy(K_S, i, tmp, 0, j);
						i += j;
						ee = tmp;
						j = ((K_S[i++] << 24) & unchecked((int)(0xff000000))) | ((K_S[i++] << 16) & unchecked(
							(int)(0x00ff0000))) | ((K_S[i++] << 8) & unchecked((int)(0x0000ff00))) | ((K_S[i
							++]) & unchecked((int)(0x000000ff)));
						tmp = new byte[j];
						System.Array.Copy(K_S, i, tmp, 0, j);
						i += j;
						n = tmp;
						NSch.SignatureRSA sig = null;
						try
						{
							Type c = Sharpen.Runtime.GetType(session.GetConfig("signature.rsa"));
							sig = (NSch.SignatureRSA)(System.Activator.CreateInstance(c));
							sig.Init();
						}
						catch (Exception ex)
						{
							System.Console.Error.WriteLine(ex);
						}
						sig.SetPubKey(ee, n);
//.........这里部分代码省略.........

//.........这里部分代码省略.........
						if (xd)
						{
							len--;
						}
						len--;
						continue;
					}
					if (buf[i] == '-')
					{
						break;
					}
					i++;
				}
				encoded_data = Util.FromBase64(buf, start, i - start);
				if (encoded_data.Length > 4 && encoded_data[0] == unchecked((byte)unchecked((int)
					(0x3f))) && encoded_data[1] == unchecked((byte)unchecked((int)(0x6f))) && encoded_data
					[2] == unchecked((byte)unchecked((int)(0xf9))) && encoded_data[3] == unchecked((
					byte)unchecked((int)(0xeb))))
				{
					// FSecure
					Buffer _buf = new Buffer(encoded_data);
					_buf.GetInt();
					// 0x3f6ff9be
					_buf.GetInt();
					byte[] _type = _buf.GetString();
					//System.err.println("type: "+new String(_type)); 
					byte[] _cipher = _buf.GetString();
					string cipher2 = Util.Byte2str(_cipher);
					//System.err.println("cipher: "+cipher); 
					if (cipher2.Equals("3des-cbc"))
					{
						_buf.GetInt();
						byte[] foo = new byte[encoded_data.Length - _buf.GetOffSet()];
						_buf.GetByte(foo);
						encoded_data = foo;
						encrypted = true;
						throw new JSchException("unknown privatekey format: " + identity);
					}
					else
					{
						if (cipher2.Equals("none"))
						{
							_buf.GetInt();
							//_buf.getInt();
							encrypted = false;
							byte[] foo = new byte[encoded_data.Length - _buf.GetOffSet()];
							_buf.GetByte(foo);
							encoded_data = foo;
						}
					}
				}
				if (pubkey == null)
				{
					return;
				}
				buf = pubkey;
				len = buf.Length;
				if (buf.Length > 4 && buf[0] == '-' && buf[1] == '-' && buf[2] == '-' && buf[3] ==
					 '-')
				{
					// FSecure's public key
					i = 0;
					do
					{
						i++;
					}