Review fixes

* Make InflaterPool size configurable via SharpZipLibOptions.InflaterPoolSize

benchmark/ICSharpCode.SharpZipLib.Benchmark/Zip/ZipFile.cs

@@ -17,6 +17,8 @@ public class ZipFile
 		[GlobalSetup]
 		public async Task GlobalSetup()
 		{
+			SharpZipLibOptions.InflaterPoolSize = 4;
+
 			// large real-world test file from test262 repository
 			string commitSha = "2e4e0e6b8ebe3348a207144204cb6d7a5571c863";
 			zipFileWithLargeAmountOfEntriesPath = Path.Combine(Path.GetTempPath(), $"{commitSha}.zip");

src/ICSharpCode.SharpZipLib/Core/InflaterPool.cs

@@ -5,35 +5,56 @@
 namespace ICSharpCode.SharpZipLib.Core
 {
 	/// <summary>
-	/// Pool Inflator instances as they can be costly due to byte array allocations.
+	/// Pool for <see cref="Inflater"/> instances as they can be costly due to byte array allocations.
 	/// </summary>
 	internal sealed class InflaterPool
 	{
-		public static InflaterPool Instance { get; } = new InflaterPool();
 		private readonly ConcurrentQueue<PooledInflater> noHeaderPool = new ConcurrentQueue<PooledInflater>();
 		private readonly ConcurrentQueue<PooledInflater> headerPool = new ConcurrentQueue<PooledInflater>();
 
+		internal static InflaterPool Instance { get; } = new InflaterPool();
+
 		private InflaterPool()
 		{
 		}
 
-		public Inflater Rent(bool noHeader = false)
+		internal Inflater Rent(bool noHeader = false)
 		{
+			if (SharpZipLibOptions.InflaterPoolSize <= 0)
+			{
+				return new Inflater(noHeader);
+			}
+
 			var pool = GetPool(noHeader);
-			var inf = pool.TryDequeue(out var inflater) ? inflater : new PooledInflater(noHeader);
-			inf.Reset();
+
+			PooledInflater inf;
+			if (pool.TryDequeue(out var inflater))
+			{
+				inf = inflater;
+				inf.Reset();
+			}
+			else
+			{
+				inf = new PooledInflater(noHeader);
+			}
+
 			return inf;
 		}
 
-		public void Return(Inflater inflater)
+		internal void Return(Inflater inflater)
 		{
+			if (SharpZipLibOptions.InflaterPoolSize <= 0)
+			{
+				return;
+			}
+
 			if (!(inflater is PooledInflater pooledInflater))
 			{
 				throw new ArgumentException("Returned inflater was not a pooled one");
 			}
 
 			var pool = GetPool(inflater.noHeader);
-			if (pool.Count < 10)
+			if (pool.Count < SharpZipLibOptions.InflaterPoolSize)
 			{
 				pooledInflater.Reset();
 				pool.Enqueue(pooledInflater);

src/ICSharpCode.SharpZipLib/SharpZipLibOptions.cs

@@ -0,0 +1,15 @@
+using ICSharpCode.SharpZipLib.Zip.Compression;
+
+namespace ICSharpCode.SharpZipLib
+{
+	/// <summary>
+	/// Global options to alter behavior.
+	/// </summary>
+	public static class SharpZipLibOptions
+	{
+		/// <summary>
+		/// The max pool size allowed for reusing <see cref="Inflater"/> instances, defaults to 0 (disabled).
+		/// </summary>
+		public static int InflaterPoolSize { get; set; } = 0;
+	}
+}