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| 1 | +using System; |
| 2 | +using System.Collections.Generic; |
| 3 | +using System.IO; |
| 4 | +using System.Linq; |
| 5 | +using System.Net; |
| 6 | +using System.Net.Sockets; |
| 7 | +using System.Text; |
| 8 | +using System.Threading; |
| 9 | +using System.Threading.Tasks; |
| 10 | + |
| 11 | +namespace Quick.Protocol.Udp |
| 12 | +{ |
| 13 | + internal class UdpClientStream : Stream |
| 14 | + { |
| 15 | + private UdpClient udpClient; |
| 16 | + private IPEndPoint remoteEndPoint; |
| 17 | + private byte[] firstRecvBuffer; |
| 18 | + private int firstRecvBufferOffset = 0; |
| 19 | + |
| 20 | + public override bool CanRead => udpClient.Available > 0; |
| 21 | + public override bool CanSeek => false; |
| 22 | + public override bool CanWrite => true; |
| 23 | + public override long Length => throw new NotImplementedException(); |
| 24 | + public override long Position { get => throw new NotImplementedException(); set => throw new NotImplementedException(); } |
| 25 | + |
| 26 | + public UdpClientStream(UdpClient udpClient, IPEndPoint remoteEndPoint, byte[] firstRecvBuffer = null) |
| 27 | + { |
| 28 | + this.udpClient = udpClient; |
| 29 | + this.remoteEndPoint = remoteEndPoint; |
| 30 | + this.firstRecvBuffer = firstRecvBuffer; |
| 31 | + } |
| 32 | + |
| 33 | + public override void Flush() { } |
| 34 | + |
| 35 | + public override int Read(byte[] buffer, int offset, int count) |
| 36 | + { |
| 37 | + return ReadAsync(buffer, offset, count, CancellationToken.None).Result; |
| 38 | + } |
| 39 | + |
| 40 | + public override async Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken) |
| 41 | + { |
| 42 | + var receivedBytes = 0; |
| 43 | + if (firstRecvBuffer != null) |
| 44 | + { |
| 45 | + var copyCount = Math.Min(count, firstRecvBuffer.Length - firstRecvBufferOffset); |
| 46 | + for (var i = 0; i < copyCount; i++) |
| 47 | + buffer[offset + i] = firstRecvBuffer[firstRecvBufferOffset + i]; |
| 48 | + |
| 49 | + offset += copyCount; |
| 50 | + firstRecvBufferOffset += copyCount; |
| 51 | + count -= copyCount; |
| 52 | + receivedBytes = copyCount; |
| 53 | + if (firstRecvBuffer.Length - firstRecvBufferOffset <= 0) |
| 54 | + { |
| 55 | + firstRecvBuffer = null; |
| 56 | + } |
| 57 | + if (count <= 0) |
| 58 | + return copyCount; |
| 59 | + } |
| 60 | + var ret = await udpClient.ReceiveAsync(cancellationToken); |
| 61 | + |
| 62 | + var ret = await udpClient.Client.ReceiveAsync( |
| 63 | + new ArraySegment<byte>(buffer, offset, count), |
| 64 | + SocketFlags.None, |
| 65 | + cancellationToken); |
| 66 | + receivedBytes += ret; |
| 67 | + return receivedBytes; |
| 68 | + } |
| 69 | + |
| 70 | + public override long Seek(long offset, SeekOrigin origin) |
| 71 | + { |
| 72 | + throw new NotImplementedException(); |
| 73 | + } |
| 74 | + |
| 75 | + public override void SetLength(long value) |
| 76 | + { |
| 77 | + throw new NotImplementedException(); |
| 78 | + } |
| 79 | + |
| 80 | + public override void Write(byte[] buffer, int offset, int count) |
| 81 | + { |
| 82 | + udpClient.Send(new ReadOnlySpan<byte>(buffer, offset, count)); |
| 83 | + } |
| 84 | + |
| 85 | + public override async Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken) |
| 86 | + { |
| 87 | + await udpClient.SendAsync(new ReadOnlyMemory<byte>(buffer, offset, count), cancellationToken); |
| 88 | + } |
| 89 | + } |
| 90 | +} |
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