simplify Stream.ReadAllBytes extension and use it more

src/BizHawk.Client.Common/RomLoader.cs

@@ -5,6 +5,7 @@ using System.IO.Compression;
 using System.Linq;
 
 using BizHawk.Common;
+using BizHawk.Common.IOExtensions;
 using BizHawk.Common.StringExtensions;
 using BizHawk.Emulation.Common;
 using BizHawk.Emulation.Cores;
@@ -497,9 +498,7 @@ namespace BizHawk.Client.Common
 			// TODO: Why does the PSF loader need CbDeflater provided?  Surely this is a matter internal to it.
 			static byte[] CbDeflater(Stream instream, int size)
 			{
-				var ret = new MemoryStream();
-				new GZipStream(instream, CompressionMode.Decompress).CopyTo(ret);
-				return ret.ToArray();
+				return new GZipStream(instream, CompressionMode.Decompress).ReadAllBytes();
 			}
 			var psf = new PSF();
 			psf.Load(path, CbDeflater);

src/BizHawk.Client.Common/movie/tasproj/ZwinderStateManager.cs

@@ -4,6 +4,7 @@ using System.IO;
 using System.Linq;
 using BizHawk.Common;
 using BizHawk.Common.CollectionExtensions;
+using BizHawk.Common.IOExtensions;
 using BizHawk.Emulation.Common;
 
 namespace BizHawk.Client.Common
@@ -67,17 +68,16 @@ namespace BizHawk.Client.Common
 		{
 			get
 			{
-				var (f, data) = GetStateClosestToFrame(frame);
+				var (f, dataStream) = GetStateClosestToFrame(frame);
 				if (f != frame)
 				{
-					data.Dispose();
+					dataStream.Dispose();
 					return NonState;
 				}
 
-				var ms = new MemoryStream();
-				data.CopyTo(ms);
-				data.Dispose();
-				return ms.ToArray();
+				var data = dataStream.ReadAllBytes();
+				dataStream.Dispose();
+				return data;
 			}
 		}
 
@@ -286,10 +286,8 @@ namespace BizHawk.Client.Common
 				return;
 			}
 
-			var ms = new MemoryStream();
 			using var s = state.GetReadStream();
-			s.CopyTo(ms);
-			_reserved.Add(state.Frame, ms.ToArray());
+			_reserved.Add(state.Frame, s.ReadAllBytes());
 			AddStateCache(state.Frame);
 		}
 

src/BizHawk.Client.EmuHawk/config/FirmwaresConfig.cs

@@ -10,6 +10,7 @@ using System.Windows.Forms;
 using BizHawk.Common;
 using BizHawk.Client.Common;
 using BizHawk.Common.CollectionExtensions;
+using BizHawk.Common.IOExtensions;
 using BizHawk.Emulation.Common;
 
 // notes: eventually, we intend to have a "firmware acquisition interface" exposed to the emulator cores.
@@ -656,13 +657,10 @@ namespace BizHawk.Client.EmuHawk
 						foreach (var ai in hf.ArchiveItems)
 						{
 							hf.BindArchiveMember(ai);
-							var stream = hf.GetStream();
-							var ms = new MemoryStream();
-							Util.CopyStream(hf.GetStream(), ms, stream.Length);
 							string outfile = ai.Name;
 							string myname = Path.GetFileName(outfile);
 							outfile = Path.Combine(extractPath, myname);
-							File.WriteAllBytes(outfile, ms.ToArray());
+							File.WriteAllBytes(outfile, hf.GetStream().ReadAllBytes());
 							hf.Unbind();
 
 							if (_cbAllowImport.Checked || Manager.CanFileBeImported(outfile))

src/BizHawk.Common/Extensions/IOExtensions.cs

@@ -11,17 +11,8 @@ namespace BizHawk.Common.IOExtensions
 
 		public static byte[] ReadAllBytes(this Stream stream)
 		{
-			const int BUFF_SIZE = 4096;
-			var buffer = new byte[BUFF_SIZE];
-
-			int bytesRead;
-			var inStream = new BufferedStream(stream);
 			var outStream = new MemoryStream();
-
-			while ((bytesRead = inStream.Read(buffer, 0, BUFF_SIZE)) > 0)
-			{
-				outStream.Write(buffer, 0, bytesRead);
-			}
+			stream.CopyTo(outStream);
 
 			return outStream.ToArray();
 		}