Update DownloadDepotChunkAsync to use array pool

DepotDownloader/ContentDownloader.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Buffers;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.IO;
@@ -1199,8 +1200,11 @@ namespace DepotDownloader
                 UncompressedLength = chunk.UncompressedLength
             };
 
-            DepotChunk chunkData = null;
+            var written = 0;
+            var chunkBuffer = ArrayPool<byte>.Shared.Rent((int)data.UncompressedLength);
 
+            try
+            {
                 do
                 {
                     cts.Token.ThrowIfCancellationRequested();
@@ -1212,14 +1216,17 @@ namespace DepotDownloader
                         connection = cdnPool.GetConnection(cts.Token);
 
                         DebugLog.WriteLine("ContentDownloader", "Downloading chunk {0} from {1} with {2}", chunkID, connection, cdnPool.ProxyServer != null ? cdnPool.ProxyServer : "no proxy");
-                    chunkData = await cdnPool.CDNClient.DownloadDepotChunkAsync(
+                        written = await cdnPool.CDNClient.DownloadDepotChunkAsync(
                             depot.DepotId,
                             data,
                             connection,
+                            chunkBuffer,
                             depot.DepotKey,
                             cdnPool.ProxyServer).ConfigureAwait(false);
 
                         cdnPool.ReturnConnection(connection);
+
+                        break;
                     }
                     catch (TaskCanceledException)
                     {
@@ -1246,9 +1253,9 @@ namespace DepotDownloader
                         cdnPool.ReturnBrokenConnection(connection);
                         Console.WriteLine("Encountered unexpected error downloading chunk {0}: {1}", chunkID, e.Message);
                     }
-            } while (chunkData == null);
+                } while (written == 0);
 
-            if (chunkData == null)
+                if (written == 0)
                 {
                     Console.WriteLine("Failed to find any server with chunk {0} for depot {1}. Aborting.", chunkID, depot.DepotId);
                     cts.Cancel();
@@ -1267,13 +1274,18 @@ namespace DepotDownloader
                         fileStreamData.fileStream = File.Open(fileFinalPath, FileMode.Open);
                     }
 
-                fileStreamData.fileStream.Seek((long)chunkData.ChunkInfo.Offset, SeekOrigin.Begin);
-                await fileStreamData.fileStream.WriteAsync(chunkData.Data.AsMemory(0, chunkData.Data.Length), cts.Token);
+                    fileStreamData.fileStream.Seek((long)data.Offset, SeekOrigin.Begin);
+                    await fileStreamData.fileStream.WriteAsync(chunkBuffer.AsMemory(0, written), cts.Token);
                 }
                 finally
                 {
                     fileStreamData.fileLock.Release();
                 }
+            }
+            finally
+            {
+                ArrayPool<byte>.Shared.Return(chunkBuffer);
+            }
 
             var remainingChunks = Interlocked.Decrement(ref fileStreamData.chunksToDownload);
             if (remainingChunks == 0)
@@ -1285,7 +1297,7 @@ namespace DepotDownloader
             ulong sizeDownloaded = 0;
             lock (depotDownloadCounter)
             {
-                sizeDownloaded = depotDownloadCounter.sizeDownloaded + (ulong)chunkData.Data.Length;
+                sizeDownloaded = depotDownloadCounter.sizeDownloaded + (ulong)written;
                 depotDownloadCounter.sizeDownloaded = sizeDownloaded;
                 depotDownloadCounter.depotBytesCompressed += chunk.CompressedLength;
                 depotDownloadCounter.depotBytesUncompressed += chunk.UncompressedLength;

DepotDownloader/DepotDownloader.csproj

@@ -15,6 +15,6 @@
   <ItemGroup>
     <PackageReference Include="protobuf-net" Version="3.2.30" />
     <PackageReference Include="QRCoder" Version="1.6.0" />
-    <PackageReference Include="SteamKit2" Version="3.0.0-Beta.1" />
+    <PackageReference Include="SteamKit2" Version="3.0.0-Beta.2" />
   </ItemGroup>
 </Project>