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using System;
using System.Collections.Generic;
using System.Net;
using System.Text;
using Impostor.Api.Games;
using Impostor.Api.Net.Messages;
namespace Impostor.Benchmarks.Data
{
public class MessageWriter
{
private static int BufferSize = 64000;
public MessageType SendOption { get; private set; }
private Stack<int> messageStarts = new Stack<int>();
public MessageWriter(byte[] buffer)
{
this.Buffer = buffer;
this.Length = this.Buffer.Length;
}
public MessageWriter(int bufferSize)
{
this.Buffer = new byte[bufferSize];
}
public byte[] Buffer { get; }
public int Length { get; set; }
public int Position { get; set; }
public byte[] ToByteArray(bool includeHeader)
{
if (includeHeader)
{
byte[] output = new byte[this.Length];
System.Buffer.BlockCopy(this.Buffer, 0, output, 0, this.Length);
return output;
}
else
{
switch (this.SendOption)
{
case MessageType.Reliable:
{
byte[] output = new byte[this.Length - 3];
System.Buffer.BlockCopy(this.Buffer, 3, output, 0, this.Length - 3);
return output;
}
case MessageType.Unreliable:
{
byte[] output = new byte[this.Length - 1];
System.Buffer.BlockCopy(this.Buffer, 1, output, 0, this.Length - 1);
return output;
}
default:
throw new ArgumentOutOfRangeException();
}
}
throw new NotImplementedException();
}
public bool HasBytes(int expected)
{
if (this.SendOption == MessageType.Unreliable)
{
return this.Length > 1 + expected;
}
return this.Length > 3 + expected;
}
public void Write(GameCode value)
{
this.Write(value.Value);
}
///
public void StartMessage(byte typeFlag)
{
messageStarts.Push(this.Position);
this.Position += 2; // Skip for size
this.Write(typeFlag);
}
///
public void EndMessage()
{
var lastMessageStart = messageStarts.Pop();
ushort length = (ushort)(this.Position - lastMessageStart - 3); // Minus length and type byte
this.Buffer[lastMessageStart] = (byte)length;
this.Buffer[lastMessageStart + 1] = (byte)(length >> 8);
}
///
public void CancelMessage()
{
this.Position = this.messageStarts.Pop();
this.Length = this.Position;
}
public void Clear(MessageType sendOption)
{
this.messageStarts.Clear();
this.SendOption = sendOption;
this.Buffer[0] = (byte)sendOption;
switch (sendOption)
{
default:
case MessageType.Unreliable:
this.Length = this.Position = 1;
break;
case MessageType.Reliable:
this.Length = this.Position = 3;
break;
}
}
#region WriteMethods
public void Write(bool value)
{
this.Buffer[this.Position++] = (byte)(value ? 1 : 0);
if (this.Position > this.Length) this.Length = this.Position;
}
public void Write(sbyte value)
{
this.Buffer[this.Position++] = (byte)value;
if (this.Position > this.Length) this.Length = this.Position;
}
public void Write(byte value)
{
this.Buffer[this.Position++] = value;
if (this.Position > this.Length) this.Length = this.Position;
}
public void Write(short value)
{
this.Buffer[this.Position++] = (byte)value;
this.Buffer[this.Position++] = (byte)(value >> 8);
if (this.Position > this.Length) this.Length = this.Position;
}
public void Write(ushort value)
{
this.Buffer[this.Position++] = (byte)value;
this.Buffer[this.Position++] = (byte)(value >> 8);
if (this.Position > this.Length) this.Length = this.Position;
}
public void Write(uint value)
{
this.Buffer[this.Position++] = (byte)value;
this.Buffer[this.Position++] = (byte)(value >> 8);
this.Buffer[this.Position++] = (byte)(value >> 16);
this.Buffer[this.Position++] = (byte)(value >> 24);
if (this.Position > this.Length) this.Length = this.Position;
}
public void Write(int value)
{
this.Buffer[this.Position++] = (byte)value;
this.Buffer[this.Position++] = (byte)(value >> 8);
this.Buffer[this.Position++] = (byte)(value >> 16);
this.Buffer[this.Position++] = (byte)(value >> 24);
if (this.Position > this.Length) this.Length = this.Position;
}
public unsafe void Write(float value)
{
fixed (byte* ptr = &this.Buffer[this.Position])
{
byte* valuePtr = (byte*)&value;
*ptr = *valuePtr;
*(ptr + 1) = *(valuePtr + 1);
*(ptr + 2) = *(valuePtr + 2);
*(ptr + 3) = *(valuePtr + 3);
}
this.Position += 4;
if (this.Position > this.Length) this.Length = this.Position;
}
public void Write(string value)
{
var bytes = UTF8Encoding.UTF8.GetBytes(value);
this.WritePacked(bytes.Length);
this.Write(bytes);
}
public void Write(IPAddress value)
{
this.Write(value.GetAddressBytes());
}
public void WriteBytesAndSize(byte[] bytes)
{
this.WritePacked((uint)bytes.Length);
this.Write(bytes);
}
public void WriteBytesAndSize(byte[] bytes, int length)
{
this.WritePacked((uint)length);
this.Write(bytes, length);
}
public void WriteBytesAndSize(byte[] bytes, int offset, int length)
{
this.WritePacked((uint)length);
this.Write(bytes, offset, length);
}
public void Write(ReadOnlyMemory<byte> data)
{
Write(data.Span);
}
public void Write(ReadOnlySpan<byte> bytes)
{
bytes.CopyTo(this.Buffer.AsSpan(this.Position, bytes.Length));
this.Position += bytes.Length;
if (this.Position > this.Length) this.Length = this.Position;
}
public void Write(byte[] bytes)
{
Array.Copy(bytes, 0, this.Buffer, this.Position, bytes.Length);
this.Position += bytes.Length;
if (this.Position > this.Length) this.Length = this.Position;
}
public void Write(byte[] bytes, int offset, int length)
{
Array.Copy(bytes, offset, this.Buffer, this.Position, length);
this.Position += length;
if (this.Position > this.Length) this.Length = this.Position;
}
public void Write(byte[] bytes, int length)
{
Array.Copy(bytes, 0, this.Buffer, this.Position, length);
this.Position += length;
if (this.Position > this.Length) this.Length = this.Position;
}
///
public void WritePacked(int value)
{
this.WritePacked((uint)value);
}
///
public void WritePacked(uint value)
{
do
{
byte b = (byte)(value & 0xFF);
if (value >= 0x80)
{
b |= 0x80;
}
this.Write(b);
value >>= 7;
} while (value > 0);
}
#endregion WriteMethods
public void Write(MessageWriter msg, bool includeHeader)
{
int offset = 0;
if (!includeHeader)
{
switch (msg.SendOption)
{
case MessageType.Unreliable:
offset = 1;
break;
case MessageType.Reliable:
offset = 3;
break;
}
}
this.Write(msg.Buffer, offset, msg.Length - offset);
}
public unsafe static bool IsLittleEndian()
{
byte b;
unsafe
{
int i = 1;
byte* bp = (byte*)&i;
b = *bp;
}
return b == 1;
}
}
}
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