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365 changes: 166 additions & 199 deletions
365
lib/ShortDev.Microsoft.ConnectedDevices/CdpSession.cs
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60 changes: 60 additions & 0 deletions
60
lib/ShortDev.Microsoft.ConnectedDevices/Transports/MessageFragmenter.cs
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using ShortDev.Microsoft.ConnectedDevices.Encryption; | ||
using ShortDev.Microsoft.ConnectedDevices.Messages; | ||
using System.Diagnostics; | ||
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namespace ShortDev.Microsoft.ConnectedDevices.Transports; | ||
public static class MessageFragmenter | ||
{ | ||
public const int DefaultMessageFragmentSize = 16384; | ||
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public static void SendMessage(this IFragmentSender sender, CommonHeader header, ReadOnlySpan<byte> payload, CdpCryptor? cryptor = null) | ||
{ | ||
if (payload.Length <= DefaultMessageFragmentSize) | ||
{ | ||
sender.SendFragment(header, payload, cryptor); | ||
return; | ||
} | ||
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header.FragmentCount = (ushort)(payload.Length / DefaultMessageFragmentSize); | ||
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var leftover = payload.Length % DefaultMessageFragmentSize; | ||
if (leftover != 0) | ||
header.FragmentCount++; | ||
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for (ushort fragmentIndex = 0; fragmentIndex < header.FragmentCount; fragmentIndex++) | ||
{ | ||
int start = fragmentIndex * DefaultMessageFragmentSize; | ||
int length = Math.Min(payload.Length - start, DefaultMessageFragmentSize); | ||
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header.FragmentIndex = fragmentIndex; | ||
sender.SendFragment(header, payload.Slice(start, length), cryptor); | ||
} | ||
} | ||
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static void SendFragment(this IFragmentSender sender, CommonHeader header, ReadOnlySpan<byte> payload, CdpCryptor? cryptor) | ||
{ | ||
Debug.Assert(payload.Length <= DefaultMessageFragmentSize); | ||
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EndianWriter writer = new(Endianness.BigEndian); | ||
if (cryptor != null) | ||
{ | ||
cryptor.EncryptMessage(writer, header, payload); | ||
} | ||
else | ||
{ | ||
header.SetPayloadLength(payload.Length); | ||
header.Write(writer); | ||
writer.Write(payload); | ||
} | ||
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sender.SendFragment(writer.Buffer.AsSpan()); | ||
} | ||
} | ||
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public interface IFragmentSender | ||
{ | ||
/// <summary> | ||
/// Sends a binary fragment. | ||
/// </summary> | ||
void SendFragment(ReadOnlySpan<byte> fragment); | ||
} |
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