Add a PooledMemoryStream to avoid allocating

src/SharpCompress/Archives/Tar/TarArchive.Async.cs

@@ -141,7 +141,7 @@ var header in TarHeaderFactory.ReadHeaderAsync(
 
                             using (var entryStream = entry.OpenEntryStream())
                             {
-                                using var memoryStream = new MemoryStream();
+                                using var memoryStream = new PooledMemoryStream();
                                 await entryStream.CopyToAsync(memoryStream).ConfigureAwait(false);
                                 memoryStream.Position = 0;
                                 var bytes = memoryStream.ToArray();

src/SharpCompress/Archives/Tar/TarArchive.cs

@@ -151,7 +151,7 @@ var header in TarHeaderFactory.ReadHeader(
 
                         using (var entryStream = entry.OpenEntryStream())
                         {
-                            using var memoryStream = new MemoryStream();
+                            using var memoryStream = new PooledMemoryStream();
                             entryStream.CopyTo(memoryStream, Constants.BufferSize);
                             memoryStream.Position = 0;
                             var bytes = memoryStream.ToArray();

src/SharpCompress/Common/Rar/CryptKey5.cs

@@ -35,7 +35,7 @@ int keyLength
     )
     {
         var passwordBytes = Encoding.UTF8.GetBytes(password);
-#if LEGACY_DOTNET || NET5_0
+#if LEGACY_DOTNET
         using var hmac = new HMACSHA256(passwordBytes);
         var block = hmac.ComputeHash(salt);
 #else
@@ -50,7 +50,7 @@ int keyLength
         {
             for (var i = 1; i < loop[x]; i++)
             {
-#if LEGACY_DOTNET || NET5_0
+#if LEGACY_DOTNET
                 block = hmac.ComputeHash(block);
 #else
                 block = HMACSHA256.HashData(passwordBytes, block);

src/SharpCompress/Common/SevenZip/ArchiveReader.cs

@@ -1182,7 +1182,7 @@ private void OpenFile()
             }
             else
             {
-                _stream = new MemoryStream();
+                _stream = new PooledMemoryStream();
             }
             _rem = _db._files[index].Size;
         }

src/SharpCompress/Common/SevenZip/SevenZipFilesInfo.cs

@@ -2,6 +2,7 @@
 using System.IO;
 using System.Text;
 using SharpCompress.Compressors.LZMA.Utilities;
+using SharpCompress.IO;
 
 namespace SharpCompress.Common.SevenZip;
 
@@ -215,7 +216,7 @@ private static void WriteFileProperty(
         Action<Stream> writeData
     )
     {
-        using var dataStream = new MemoryStream();
+        using var dataStream = new PooledMemoryStream();
         writeData(dataStream);
 
         stream.WriteByte((byte)propertyId);

src/SharpCompress/Common/Tar/Headers/TarHeader.Async.cs

@@ -59,7 +59,7 @@ private async ValueTask WriteUstarAsync(Stream output, CancellationToken cancell
             int splitIndex = -1;
             for (int i = 0; i < dirSeps.Count; i++)
             {
-#if NET5_0_OR_GREATER
+#if NET6_0_OR_GREATER
                 int count = ArchiveEncoding
                     .GetEncoding()
                     .GetByteCount(fullName.AsSpan(0, dirSeps[i]));

src/SharpCompress/Common/Tar/Headers/TarHeader.cs

@@ -89,7 +89,7 @@ internal void WriteUstar(Stream output)
             int splitIndex = -1;
             for (int i = 0; i < dirSeps.Count; i++)
             {
-#if NET5_0_OR_GREATER
+#if NET6_0_OR_GREATER
                 int count = ArchiveEncoding
                     .GetEncoding()
                     .GetByteCount(fullName.AsSpan(0, dirSeps[i]));

src/SharpCompress/Compressors/LZMA/Lzma2EncoderStream.cs

@@ -1,5 +1,6 @@
 using System;
 using System.IO;
+using SharpCompress.IO;
 
 namespace SharpCompress.Compressors.LZMA;
 
@@ -158,7 +159,7 @@ private byte[] CompressBlock(ReadOnlySpan<byte> data)
         }
 
         using var inputMs = new MemoryStream(data.ToArray(), writable: false);
-        using var outputMs = new MemoryStream();
+        using var outputMs = new PooledMemoryStream();
 
         encoder.Code(inputMs, outputMs, data.Length, -1, null);
 
@@ -190,7 +191,7 @@ private int FindConsumedBytes(byte[] compressedData, int uncompressedSize)
         decoder.SetDecoderProperties(props);
 
         using var input = new MemoryStream(compressedData);
-        using var output = new MemoryStream();
+        using var output = new PooledMemoryStream();
         decoder.Code(input, output, compressedData.Length, uncompressedSize, null);
 
         return (int)input.Position;

src/SharpCompress/Compressors/PPMd/PpmdStream.cs

@@ -7,6 +7,7 @@
 using SharpCompress.Compressors.LZMA.RangeCoder;
 using SharpCompress.Compressors.PPMd.H;
 using SharpCompress.Compressors.PPMd.I1;
+using SharpCompress.IO;
 
 namespace SharpCompress.Compressors.PPMd;
 
@@ -179,7 +180,7 @@ protected override void Dispose(bool disposing)
         {
             if (_compress)
             {
-                _model.EncodeBlock(_stream, new MemoryStream(), true);
+                _model.EncodeBlock(_stream, Stream.Null, true);
             }
         }
         base.Dispose(disposing);

src/SharpCompress/Compressors/Squeezed/SqueezedStream.Async.cs

@@ -4,6 +4,7 @@
 using System.Threading.Tasks;
 using SharpCompress.Common;
 using SharpCompress.Compressors.RLE90;
+using SharpCompress.IO;
 
 namespace SharpCompress.Compressors.Squeezed;
 
@@ -54,14 +55,14 @@ private async Task<Stream> BuildDecodedStreamAsync(CancellationToken cancellatio
 
         if (bytesRead != 2)
         {
-            return new MemoryStream(Array.Empty<byte>());
+            return new PooledMemoryStream();
         }
 
         int numnodes = numNodesBytes[0] | (numNodesBytes[1] << 8);
 
         if (numnodes >= NUMVALS || numnodes == 0)
         {
-            return new MemoryStream(Array.Empty<byte>());
+            return new PooledMemoryStream();
         }
 
         var dnode = new int[numnodes, 2];
@@ -82,7 +83,7 @@ private async Task<Stream> BuildDecodedStreamAsync(CancellationToken cancellatio
         }
 
         var bitReader = new BitReader(_stream);
-        var huffmanDecoded = new MemoryStream();
+        var huffmanDecoded = new PooledMemoryStream();
         int i = 0;
 
         while (true)

src/SharpCompress/Compressors/Squeezed/SqueezedStream.cs

@@ -4,6 +4,7 @@
 using System.Text;
 using SharpCompress.Common;
 using SharpCompress.Compressors.RLE90;
+using SharpCompress.IO;
 
 namespace SharpCompress.Compressors.Squeezed;
 
@@ -67,7 +68,7 @@ private Stream BuildDecodedStream()
 
         if (numnodes >= NUMVALS || numnodes == 0)
         {
-            return new MemoryStream(Array.Empty<byte>());
+            return new PooledMemoryStream();
         }
 
         var dnode = new int[numnodes, 2];
@@ -78,7 +79,7 @@ private Stream BuildDecodedStream()
         }
 
         var bitReader = new BitReader(_stream);
-        var huffmanDecoded = new MemoryStream();
+        var huffmanDecoded = new PooledMemoryStream();
         int i = 0;
 
         while (true)

src/SharpCompress/Compressors/ZStandard/Unsafe/ZstdInternal.cs

@@ -5,7 +5,7 @@
 #if NETCOREAPP3_0_OR_GREATER
 using System.Runtime.Intrinsics.X86;
 #endif
-#if NET5_0_OR_GREATER
+#if NET6_0_OR_GREATER
 using System.Runtime.Intrinsics.Arm;
 #endif
 
@@ -554,7 +554,7 @@ the dst buffer. In circumstances where the op "catches up" to where the
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     private static void ZSTD_copy16(void* dst, void* src)
     {
-#if NET5_0_OR_GREATER
+#if NET6_0_OR_GREATER
         if (AdvSimd.IsSupported)
         {
             AdvSimd.Store((byte*)dst, AdvSimd.LoadVector128((byte*)src));

src/SharpCompress/Compressors/ZStandard/Unsafe/ZstdLazy.cs

@@ -6,7 +6,7 @@
 using System.Runtime.Intrinsics;
 using System.Runtime.Intrinsics.X86;
 #endif
-#if NET5_0_OR_GREATER
+#if NET6_0_OR_GREATER
 using System.Runtime.Intrinsics.Arm;
 #endif
 
@@ -1172,7 +1172,7 @@ private static uint ZSTD_row_matchMaskGroupWidth(uint rowEntries)
     {
         assert(rowEntries == 16 || rowEntries == 32 || rowEntries == 64);
         assert(rowEntries <= 64);
-#if NET5_0_OR_GREATER
+#if NET6_0_OR_GREATER
         if (AdvSimd.IsSupported && BitConverter.IsLittleEndian)
         {
             if (rowEntries == 16)
@@ -1272,7 +1272,7 @@ uint rowEntries
         }
 #endif
 
-#if NET5_0_OR_GREATER
+#if NET6_0_OR_GREATER
         if (AdvSimd.IsSupported && BitConverter.IsLittleEndian)
         {
             if (rowEntries == 16)