Initial

2025-08-27 03:02:29 +02:00
commit 80235a174b
344 changed files with 43249 additions and 0 deletions
--- a/LightlessSyncServer/LightlessSyncStaticFilesServer/Utils/BlockFileDataStream.cs
+++ b/LightlessSyncServer/LightlessSyncStaticFilesServer/Utils/BlockFileDataStream.cs
@@ -0,0 +1,108 @@
+
+namespace LightlessSyncStaticFilesServer.Utils;
+
+public sealed class BlockFileDataStream : Stream
+{
+    private readonly IEnumerable<BlockFileDataSubstream> _substreams;
+    private int _currentStreamIndex = 0;
+
+    public BlockFileDataStream(IEnumerable<BlockFileDataSubstream> substreams)
+    {
+        _substreams = substreams;
+    }
+
+    public override bool CanRead => true;
+    public override bool CanSeek => false;
+    public override bool CanWrite => false;
+    public override long Length => throw new NotSupportedException();
+    public override long Position { get => throw new NotSupportedException(); set => throw new NotSupportedException(); }
+
+    public override async Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
+    {
+        int totalRead = 0;
+        int currentOffset = 0;
+        int remainingCount = count;
+        while (totalRead < count && _currentStreamIndex < _substreams.Count())
+        {
+            var lastReadBytes = await _substreams.ElementAt(_currentStreamIndex).ReadAsync(buffer, currentOffset, remainingCount, cancellationToken).ConfigureAwait(false);
+            if (lastReadBytes < remainingCount)
+            {
+                _substreams.ElementAt(_currentStreamIndex).Dispose();
+                _currentStreamIndex++;
+            }
+
+            totalRead += lastReadBytes;
+            currentOffset += lastReadBytes;
+            remainingCount -= lastReadBytes;
+        }
+
+        return totalRead;
+    }
+
+    public override int Read(byte[] buffer, int offset, int count)
+    {
+        int totalRead = 0;
+        int currentOffset = 0;
+        int remainingCount = count;
+        while (totalRead < count && _currentStreamIndex < _substreams.Count())
+        {
+            var lastReadBytes = _substreams.ElementAt(_currentStreamIndex).Read(buffer, currentOffset, remainingCount);
+            if (lastReadBytes < remainingCount)
+            {
+                _substreams.ElementAt(_currentStreamIndex).Dispose();
+                _currentStreamIndex++;
+            }
+
+            totalRead += lastReadBytes;
+            currentOffset += lastReadBytes;
+            remainingCount -= lastReadBytes;
+        }
+
+        return totalRead;
+    }
+
+    public override async ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken = default)
+    {
+        int totalRead = 0;
+
+        while (totalRead < buffer.Length && _currentStreamIndex < _substreams.Count())
+        {
+            var substream = _substreams.ElementAt(_currentStreamIndex);
+            int bytesRead = await substream.ReadAsync(buffer.Slice(totalRead), cancellationToken).ConfigureAwait(false);
+
+            if (bytesRead == 0)
+            {
+                substream.Dispose();
+                _currentStreamIndex++;
+            }
+            else
+            {
+                totalRead += bytesRead;
+            }
+        }
+
+        return totalRead;
+    }
+
+    protected override void Dispose(bool disposing)
+    {
+        if (disposing)
+        {
+            foreach (var substream in _substreams)
+            {
+                // probably unnecessary but better safe than sorry
+                substream.Dispose();
+            }
+        }
+
+        base.Dispose(disposing);
+    }
+
+    public override void Flush() => throw new NotSupportedException();
+
+    public override long Seek(long offset, SeekOrigin origin) => throw new NotSupportedException();
+
+    public override void SetLength(long value) => throw new NotSupportedException();
+
+    public override void Write(byte[] buffer, int offset, int count) => throw new NotSupportedException();
+}