From 41de6d17411a3e5cb962da06c18ffb2a69b40849 Mon Sep 17 00:00:00 2001
From: Patrick Barron <barronpm@gmail.com>
Date: Tue, 9 Jan 2024 11:57:55 -0500
Subject: Move StreamHelper to LiveTv project

---
 src/Jellyfin.LiveTv/StreamHelper.cs | 150 ++++++++++++++++++++++++++++++++++++
 1 file changed, 150 insertions(+)
 create mode 100644 src/Jellyfin.LiveTv/StreamHelper.cs

(limited to 'src')

diff --git a/src/Jellyfin.LiveTv/StreamHelper.cs b/src/Jellyfin.LiveTv/StreamHelper.cs
new file mode 100644
index 000000000..ab4b6e9b1
--- /dev/null
+++ b/src/Jellyfin.LiveTv/StreamHelper.cs
@@ -0,0 +1,150 @@
+#pragma warning disable CS1591
+
+using System;
+using System.Buffers;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using MediaBrowser.Model.IO;
+
+namespace Jellyfin.LiveTv
+{
+    public class StreamHelper : IStreamHelper
+    {
+        public async Task CopyToAsync(Stream source, Stream destination, int bufferSize, Action? onStarted, CancellationToken cancellationToken)
+        {
+            byte[] buffer = ArrayPool<byte>.Shared.Rent(bufferSize);
+            try
+            {
+                int read;
+                while ((read = await source.ReadAsync(buffer, cancellationToken).ConfigureAwait(false)) != 0)
+                {
+                    cancellationToken.ThrowIfCancellationRequested();
+
+                    await destination.WriteAsync(buffer.AsMemory(0, read), cancellationToken).ConfigureAwait(false);
+
+                    if (onStarted is not null)
+                    {
+                        onStarted();
+                        onStarted = null;
+                    }
+                }
+            }
+            finally
+            {
+                ArrayPool<byte>.Shared.Return(buffer);
+            }
+        }
+
+        public async Task CopyToAsync(Stream source, Stream destination, int bufferSize, int emptyReadLimit, CancellationToken cancellationToken)
+        {
+            byte[] buffer = ArrayPool<byte>.Shared.Rent(bufferSize);
+            try
+            {
+                if (emptyReadLimit <= 0)
+                {
+                    int read;
+                    while ((read = await source.ReadAsync(buffer, cancellationToken).ConfigureAwait(false)) != 0)
+                    {
+                        cancellationToken.ThrowIfCancellationRequested();
+
+                        await destination.WriteAsync(buffer.AsMemory(0, read), cancellationToken).ConfigureAwait(false);
+                    }
+
+                    return;
+                }
+
+                var eofCount = 0;
+
+                while (eofCount < emptyReadLimit)
+                {
+                    cancellationToken.ThrowIfCancellationRequested();
+
+                    var bytesRead = await source.ReadAsync(buffer, cancellationToken).ConfigureAwait(false);
+
+                    if (bytesRead == 0)
+                    {
+                        eofCount++;
+                        await Task.Delay(50, cancellationToken).ConfigureAwait(false);
+                    }
+                    else
+                    {
+                        eofCount = 0;
+
+                        await destination.WriteAsync(buffer.AsMemory(0, bytesRead), cancellationToken).ConfigureAwait(false);
+                    }
+                }
+            }
+            finally
+            {
+                ArrayPool<byte>.Shared.Return(buffer);
+            }
+        }
+
+        public async Task CopyToAsync(Stream source, Stream destination, long copyLength, CancellationToken cancellationToken)
+        {
+            byte[] buffer = ArrayPool<byte>.Shared.Rent(IODefaults.CopyToBufferSize);
+            try
+            {
+                int bytesRead;
+
+                while ((bytesRead = await source.ReadAsync(buffer, cancellationToken).ConfigureAwait(false)) != 0)
+                {
+                    var bytesToWrite = Math.Min(bytesRead, copyLength);
+
+                    if (bytesToWrite > 0)
+                    {
+                        await destination.WriteAsync(buffer.AsMemory(0, Convert.ToInt32(bytesToWrite)), cancellationToken).ConfigureAwait(false);
+                    }
+
+                    copyLength -= bytesToWrite;
+
+                    if (copyLength <= 0)
+                    {
+                        break;
+                    }
+                }
+            }
+            finally
+            {
+                ArrayPool<byte>.Shared.Return(buffer);
+            }
+        }
+
+        public async Task CopyUntilCancelled(Stream source, Stream target, int bufferSize, CancellationToken cancellationToken)
+        {
+            byte[] buffer = ArrayPool<byte>.Shared.Rent(bufferSize);
+            try
+            {
+                while (!cancellationToken.IsCancellationRequested)
+                {
+                    var bytesRead = await CopyToAsyncInternal(source, target, buffer, cancellationToken).ConfigureAwait(false);
+
+                    if (bytesRead == 0)
+                    {
+                        await Task.Delay(100, cancellationToken).ConfigureAwait(false);
+                    }
+                }
+            }
+            finally
+            {
+                ArrayPool<byte>.Shared.Return(buffer);
+            }
+        }
+
+        private static async Task<int> CopyToAsyncInternal(Stream source, Stream destination, byte[] buffer, CancellationToken cancellationToken)
+        {
+            int bytesRead;
+            int totalBytesRead = 0;
+
+            while ((bytesRead = await source.ReadAsync(buffer, cancellationToken).ConfigureAwait(false)) != 0)
+            {
+                await destination.WriteAsync(buffer.AsMemory(0, bytesRead), cancellationToken).ConfigureAwait(false);
+
+                totalBytesRead += bytesRead;
+            }
+
+            return totalBytesRead;
+        }
+    }
+}
-- 
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