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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
using System;
using System.IO;
using Task = System.Threading.Tasks.Task;
namespace QtVsTools.Core.Common
{
public static partial class Utils
{
public enum StreamAction
{
KeepStreaming,
StopStreaming
}
public class StreamDataEventArgs : EventArgs
{
public byte[] Data { get; }
public StreamDataEventArgs(byte[] data, int count)
{
Data = new byte[count];
Buffer.BlockCopy(data, 0, Data, 0, count);
}
}
public class StreamMonitor : Stream
{
private readonly Stream monitoredStream;
public bool LoggingEnabled { get; set; }
public delegate void DataReceivedDelegate(StreamDataEventArgs args);
public event DataReceivedDelegate DataReceived;
public delegate (StreamData Data, StreamAction action)
StreamModifierDelegate(StreamData data);
public StreamModifierDelegate StreamModifier { get; set; }
public bool IsConnected => monitoredStream is { CanRead: true } or { CanWrite: true };
public StreamMonitor(Stream stream)
{
monitoredStream = stream ?? throw new ArgumentNullException(nameof(stream));
}
public override int Read(byte[] buffer, int offset, int count)
{
var bytesRead = monitoredStream.Read(buffer, offset, count);
if (LoggingEnabled && bytesRead > 0)
_ = Task.Run(() => DataReceived?.Invoke(new StreamDataEventArgs(buffer, bytesRead)));
return bytesRead;
}
public override void Write(byte[] buffer, int offset, int count)
{
if (StreamModifier != null) {
var streamData = new StreamData
{
Bytes = buffer,
Offset = offset,
Count = count
};
var (modifiedData, action) = StreamModifier(streamData);
buffer = modifiedData.Bytes;
count = modifiedData.Count;
if (action == StreamAction.StopStreaming)
StreamModifier = null;
}
monitoredStream.Write(buffer, offset, count);
if (LoggingEnabled && count > 0)
_ = Task.Run(() => DataReceived?.Invoke(new StreamDataEventArgs(buffer, count)));
}
public override bool CanRead => monitoredStream.CanRead;
public override bool CanSeek => monitoredStream.CanSeek;
public override bool CanWrite => monitoredStream.CanWrite;
public override long Length => monitoredStream.Length;
public override long Position
{
get => monitoredStream.Position;
set => monitoredStream.Position = value;
}
public override void Flush() => monitoredStream.Flush();
public override long Seek(long offset, SeekOrigin origin)
=> monitoredStream.Seek(offset, origin);
public override void SetLength(long value) => monitoredStream.SetLength(value);
#region IDisposable
private bool disposed;
protected override void Dispose(bool disposing)
{
if (!disposed) {
if (disposing)
monitoredStream?.Dispose();
disposed = true;
GC.SuppressFinalize(this);
}
base.Dispose(disposing);
}
~StreamMonitor()
{
Dispose(false);
}
#endregion IDisposable
}
}
}
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