sockscape/server/Libraries/Kneesocks/ReadBuffer.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
namespace Kneesocks {
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internal class ReadBuffer {
private const int BufferSize = 1024;
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private List<byte> Buffer;
private int ExpectedLength;
private string ExpectedString;
private NetworkStream Source;
private DateTime StartTime;
public bool IsReading { get; private set; } = false;
public ReadBuffer(NetworkStream source) {
Source = source;
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Buffer = new List<byte>();
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}
public TimeSpan ElapsedReadTime {
get {
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return DateTime.UtcNow - StartTime;
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}
}
private byte[] CheckBuffer() {
byte[] returnValue = null;
if(ExpectedString != null) {
var location = Encoding.ASCII.GetString(Buffer.ToArray()).IndexOf(ExpectedString);
if(location != -1) {
var fullJump = location + ExpectedString.Length;
returnValue = Buffer.Take(fullJump).ToArray();
Buffer = Buffer.Skip(fullJump).ToList();
IsReading = false;
}
} else {
if(Buffer.Count >= ExpectedLength) {
returnValue = Buffer.Take(ExpectedLength).ToArray();
Buffer = Buffer.Skip(ExpectedLength).ToList();
IsReading = false;
}
}
return returnValue;
}
public byte[] AttemptRead() {
if(!IsReading)
return null;
if(!Source.CanRead)
return null;
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byte[] returnValue;
if((returnValue = CheckBuffer()) != null)
return returnValue;
var buffer = new byte[BufferSize];
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while(Source.DataAvailable) {
var readAmount = ExpectedString == null
? Math.Min(BufferSize, ExpectedLength - Buffer.Count)
: BufferSize;
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var bytesRead = Source.Read(buffer, 0, readAmount);
Buffer.AddRange(bytesRead == BufferSize ? buffer : buffer.Take(bytesRead));
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if((returnValue = CheckBuffer()) != null)
return returnValue;
}
return null;
}
public byte[] AttemptRead(int length) {
if(IsReading)
return null;
IsReading = true;
ExpectedLength = length;
ExpectedString = null;
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StartTime = DateTime.UtcNow;
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return AttemptRead();
}
public byte[] AttemptRead(string terminator) {
if(IsReading)
return null;
IsReading = true;
ExpectedString = terminator;
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StartTime = DateTime.UtcNow;
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return AttemptRead();
}
}
}