mirror of
https://github.com/ServUO/ServUO
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439 lines
No EOL
11 KiB
C#
439 lines
No EOL
11 KiB
C#
#region References
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Text;
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#endregion
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namespace Server.Network
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{
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/// <summary>
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/// Provides functionality for writing primitive binary data.
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/// </summary>
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public class PacketWriter
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{
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private static readonly Stack<PacketWriter> m_Pool = new Stack<PacketWriter>();
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public static PacketWriter CreateInstance()
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{
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return CreateInstance(32);
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}
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public static PacketWriter CreateInstance(int capacity)
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{
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PacketWriter pw = null;
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lock (m_Pool)
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{
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if (m_Pool.Count > 0)
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{
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pw = m_Pool.Pop();
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if (pw != null)
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{
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pw.m_Capacity = capacity;
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pw.m_Stream.SetLength(0);
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}
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}
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}
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if (pw == null)
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{
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pw = new PacketWriter(capacity);
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}
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return pw;
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}
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public static void ReleaseInstance(PacketWriter pw)
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{
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lock (m_Pool)
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{
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if (!m_Pool.Contains(pw))
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{
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m_Pool.Push(pw);
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}
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else
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{
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try
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{
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using (var op = new StreamWriter("neterr.log"))
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{
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op.WriteLine("{0}\tInstance pool contains writer", DateTime.UtcNow);
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}
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}
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catch
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{
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Console.WriteLine("net error");
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}
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}
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}
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}
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/// <summary>
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/// Internal stream which holds the entire packet.
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/// </summary>
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private readonly MemoryStream m_Stream;
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private int m_Capacity;
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/// <summary>
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/// Internal format buffer.
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/// </summary>
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private readonly byte[] m_Buffer = new byte[4];
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/// <summary>
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/// Instantiates a new PacketWriter instance with the default capacity of 4 bytes.
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/// </summary>
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public PacketWriter()
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: this(32)
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{ }
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/// <summary>
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/// Instantiates a new PacketWriter instance with a given capacity.
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/// </summary>
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/// <param name="capacity">Initial capacity for the internal stream.</param>
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public PacketWriter(int capacity)
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{
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m_Stream = new MemoryStream(capacity);
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m_Capacity = capacity;
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}
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/// <summary>
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/// Writes a 1-byte boolean value to the underlying stream. False is represented by 0, true by 1.
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/// </summary>
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public void Write(bool value)
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{
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m_Stream.WriteByte((byte)(value ? 1 : 0));
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}
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/// <summary>
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/// Writes a 1-byte unsigned integer value to the underlying stream.
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/// </summary>
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public void Write(byte value)
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{
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m_Stream.WriteByte(value);
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}
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/// <summary>
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/// Writes a 1-byte signed integer value to the underlying stream.
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/// </summary>
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public void Write(sbyte value)
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{
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m_Stream.WriteByte((byte)value);
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}
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/// <summary>
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/// Writes a 2-byte signed integer value to the underlying stream.
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/// </summary>
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public void Write(short value)
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{
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m_Buffer[0] = (byte)(value >> 8);
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m_Buffer[1] = (byte)value;
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m_Stream.Write(m_Buffer, 0, 2);
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}
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/// <summary>
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/// Writes a 2-byte unsigned integer value to the underlying stream.
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/// </summary>
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public void Write(ushort value)
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{
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m_Buffer[0] = (byte)(value >> 8);
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m_Buffer[1] = (byte)value;
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m_Stream.Write(m_Buffer, 0, 2);
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}
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/// <summary>
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/// Writes a 4-byte signed integer value to the underlying stream.
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/// </summary>
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public void Write(int value)
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{
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m_Buffer[0] = (byte)(value >> 24);
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m_Buffer[1] = (byte)(value >> 16);
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m_Buffer[2] = (byte)(value >> 8);
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m_Buffer[3] = (byte)value;
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m_Stream.Write(m_Buffer, 0, 4);
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}
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/// <summary>
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/// Writes a 4-byte unsigned integer value to the underlying stream.
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/// </summary>
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public void Write(uint value)
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{
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m_Buffer[0] = (byte)(value >> 24);
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m_Buffer[1] = (byte)(value >> 16);
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m_Buffer[2] = (byte)(value >> 8);
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m_Buffer[3] = (byte)value;
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m_Stream.Write(m_Buffer, 0, 4);
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}
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/// <summary>
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/// Writes a sequence of bytes to the underlying stream
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/// </summary>
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public void Write(byte[] buffer, int offset, int size)
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{
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m_Stream.Write(buffer, offset, size);
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}
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/// <summary>
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/// Writes a fixed-length ASCII-encoded string value to the underlying stream. To fit (size), the string content is either truncated or padded with null characters.
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/// </summary>
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public void WriteAsciiFixed(string value, int size)
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{
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if (value == null)
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{
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Console.WriteLine("Network: Attempted to WriteAsciiFixed() with null value");
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value = String.Empty;
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}
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var length = value.Length;
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m_Stream.SetLength(m_Stream.Length + size);
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if (length >= size)
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{
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m_Stream.Position += Encoding.ASCII.GetBytes(value, 0, size, m_Stream.GetBuffer(), (int)m_Stream.Position);
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}
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else
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{
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Encoding.ASCII.GetBytes(value, 0, length, m_Stream.GetBuffer(), (int)m_Stream.Position);
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m_Stream.Position += size;
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}
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/*byte[] buffer = Encoding.ASCII.GetBytes( value );
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if ( buffer.Length >= size )
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{
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m_Stream.Write( buffer, 0, size );
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}
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else
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{
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m_Stream.Write( buffer, 0, buffer.Length );
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Fill( size - buffer.Length );
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}*/
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}
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/// <summary>
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/// Writes a dynamic-length ASCII-encoded string value to the underlying stream, followed by a 1-byte null character.
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/// </summary>
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public void WriteAsciiNull(string value)
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{
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if (value == null)
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{
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Console.WriteLine("Network: Attempted to WriteAsciiNull() with null value");
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value = String.Empty;
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}
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var length = value.Length;
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m_Stream.SetLength(m_Stream.Length + length + 1);
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Encoding.ASCII.GetBytes(value, 0, length, m_Stream.GetBuffer(), (int)m_Stream.Position);
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m_Stream.Position += length + 1;
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/*byte[] buffer = Encoding.ASCII.GetBytes( value );
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m_Stream.Write( buffer, 0, buffer.Length );
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m_Stream.WriteByte( 0 );*/
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}
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/// <summary>
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/// Writes a dynamic-length little-endian unicode string value to the underlying stream, followed by a 2-byte null character.
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/// </summary>
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public void WriteLittleUniNull(string value)
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{
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if (value == null)
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{
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Console.WriteLine("Network: Attempted to WriteLittleUniNull() with null value");
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value = String.Empty;
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}
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var length = value.Length;
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m_Stream.SetLength(m_Stream.Length + ((length + 1) * 2));
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m_Stream.Position += Encoding.Unicode.GetBytes(value, 0, length, m_Stream.GetBuffer(), (int)m_Stream.Position);
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m_Stream.Position += 2;
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/*byte[] buffer = Encoding.Unicode.GetBytes( value );
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m_Stream.Write( buffer, 0, buffer.Length );
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m_Buffer[0] = 0;
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m_Buffer[1] = 0;
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m_Stream.Write( m_Buffer, 0, 2 );*/
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}
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/// <summary>
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/// Writes a fixed-length little-endian unicode string value to the underlying stream. To fit (size), the string content is either truncated or padded with null characters.
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/// </summary>
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public void WriteLittleUniFixed(string value, int size)
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{
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if (value == null)
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{
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Console.WriteLine("Network: Attempted to WriteLittleUniFixed() with null value");
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value = String.Empty;
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}
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size *= 2;
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var length = value.Length;
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m_Stream.SetLength(m_Stream.Length + size);
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if ((length * 2) >= size)
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{
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m_Stream.Position += Encoding.Unicode.GetBytes(value, 0, length, m_Stream.GetBuffer(), (int)m_Stream.Position);
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}
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else
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{
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Encoding.Unicode.GetBytes(value, 0, length, m_Stream.GetBuffer(), (int)m_Stream.Position);
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m_Stream.Position += size;
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}
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/*size *= 2;
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byte[] buffer = Encoding.Unicode.GetBytes( value );
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if ( buffer.Length >= size )
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{
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m_Stream.Write( buffer, 0, size );
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}
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else
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{
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m_Stream.Write( buffer, 0, buffer.Length );
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Fill( size - buffer.Length );
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}*/
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}
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/// <summary>
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/// Writes a dynamic-length big-endian unicode string value to the underlying stream, followed by a 2-byte null character.
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/// </summary>
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public void WriteBigUniNull(string value)
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{
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if (value == null)
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{
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Console.WriteLine("Network: Attempted to WriteBigUniNull() with null value");
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value = String.Empty;
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}
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var length = value.Length;
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m_Stream.SetLength(m_Stream.Length + ((length + 1) * 2));
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m_Stream.Position += Encoding.BigEndianUnicode.GetBytes(
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value, 0, length, m_Stream.GetBuffer(), (int)m_Stream.Position);
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m_Stream.Position += 2;
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/*byte[] buffer = Encoding.BigEndianUnicode.GetBytes( value );
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m_Stream.Write( buffer, 0, buffer.Length );
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m_Buffer[0] = 0;
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m_Buffer[1] = 0;
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m_Stream.Write( m_Buffer, 0, 2 );*/
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}
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/// <summary>
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/// Writes a fixed-length big-endian unicode string value to the underlying stream. To fit (size), the string content is either truncated or padded with null characters.
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/// </summary>
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public void WriteBigUniFixed(string value, int size)
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{
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if (value == null)
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{
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Console.WriteLine("Network: Attempted to WriteBigUniFixed() with null value");
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value = String.Empty;
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}
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size *= 2;
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var length = value.Length;
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m_Stream.SetLength(m_Stream.Length + size);
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if ((length * 2) >= size)
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{
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m_Stream.Position += Encoding.BigEndianUnicode.GetBytes(
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value, 0, length, m_Stream.GetBuffer(), (int)m_Stream.Position);
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}
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else
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{
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Encoding.BigEndianUnicode.GetBytes(value, 0, length, m_Stream.GetBuffer(), (int)m_Stream.Position);
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m_Stream.Position += size;
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}
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/*size *= 2;
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byte[] buffer = Encoding.BigEndianUnicode.GetBytes( value );
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if ( buffer.Length >= size )
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{
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m_Stream.Write( buffer, 0, size );
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}
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else
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{
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m_Stream.Write( buffer, 0, buffer.Length );
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Fill( size - buffer.Length );
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}*/
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}
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/// <summary>
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/// Fills the stream from the current position up to (capacity) with 0x00's
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/// </summary>
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public void Fill()
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{
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Fill((int)(m_Capacity - m_Stream.Length));
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}
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/// <summary>
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/// Writes a number of 0x00 byte values to the underlying stream.
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/// </summary>
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public void Fill(int length)
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{
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if (m_Stream.Position == m_Stream.Length)
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{
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m_Stream.SetLength(m_Stream.Length + length);
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m_Stream.Seek(0, SeekOrigin.End);
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}
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else
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{
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m_Stream.Write(new byte[length], 0, length);
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}
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}
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/// <summary>
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/// Gets the total stream length.
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/// </summary>
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public long Length => m_Stream.Length;
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/// <summary>
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/// Gets or sets the current stream position.
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/// </summary>
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public long Position { get => m_Stream.Position; set => m_Stream.Position = value; }
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/// <summary>
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/// The internal stream used by this PacketWriter instance.
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/// </summary>
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public MemoryStream UnderlyingStream => m_Stream;
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/// <summary>
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/// Offsets the current position from an origin.
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/// </summary>
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public long Seek(long offset, SeekOrigin origin)
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{
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return m_Stream.Seek(offset, origin);
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}
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/// <summary>
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/// Gets the entire stream content as a byte array.
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/// </summary>
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public byte[] ToArray()
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{
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return m_Stream.ToArray();
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}
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}
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} |