diff --git a/BizHawk.Client.Common/BinarySaveStates.cs b/BizHawk.Client.Common/BinarySaveStates.cs
index c0731e358a..bab7932b91 100644
--- a/BizHawk.Client.Common/BinarySaveStates.cs
+++ b/BizHawk.Client.Common/BinarySaveStates.cs
@@ -100,10 +100,10 @@ namespace BizHawk.Client.Common
 			}
 		}
 
-		private void ReadVersion(Stream s)
+		private void ReadVersion(Stream s, long length)
 		{
 			// the "BizState 1.0" tag contains an integer in it describing the sub version.
-			if (s.Length == 0)
+			if (length == 0)
 			{
 				_ver = new Version(1, 0, 0); // except for the first release, which doesn't
 			}
@@ -160,7 +160,7 @@ namespace BizHawk.Client.Common
 		/// <param name="abort">true to throw exception on failure</param>
 		/// <param name="callback">function to call with the desired stream</param>
 		/// <returns>true if callback was called and stream was loaded</returns>
-		public bool GetLump(BinaryStateLump lump, bool abort, Action<Stream> callback)
+		public bool GetLump(BinaryStateLump lump, bool abort, Action<Stream, long> callback)
 		{
 			var name = BinaryStateFileNames.Get(lump);
 			var e = _zip.GetEntry(name);
@@ -168,7 +168,7 @@ namespace BizHawk.Client.Common
 			{
 				using (var zs = _zip.GetInputStream(e))
 				{
-					callback(zs);
+					callback(zs, e.Size);
 				}
 
 				return true;
@@ -184,26 +184,45 @@ namespace BizHawk.Client.Common
 
 		public bool GetLump(BinaryStateLump lump, bool abort, Action<BinaryReader> callback)
 		{
-			return GetLump(lump, abort, delegate(Stream s)
+			return GetLump(lump, abort, delegate(Stream s, long unused)
 			{
 				var br = new BinaryReader(s);
 				callback(br);
 			});
 		}
 
+		public bool GetLump(BinaryStateLump lump, bool abort, Action<BinaryReader, long> callback)
+		{
+			return GetLump(lump, abort, delegate(Stream s, long length)
+			{
+				var br = new BinaryReader(s);
+				callback(br, length);
+			});
+		}
+
 		public bool GetLump(BinaryStateLump lump, bool abort, Action<TextReader> callback)
 		{
-			return GetLump(lump, abort, delegate(Stream s)
+			return GetLump(lump, abort, delegate(Stream s, long unused)
 			{
 				var tr = new StreamReader(s);
 				callback(tr);
 			});
 		}
 
+		/*
 		/// <summary>
 		/// load binary state, or text state if binary state lump doesn't exist
 		/// </summary>
 		public void GetCoreState(Action<Stream> callbackBinary, Action<Stream> callbackText)
+		{
+			if (!GetLump(BinaryStateLump.Corestate, false, callbackBinary)
+			    && !GetLump(BinaryStateLump.CorestateText, false, callbackText))
+			{
+				throw new Exception("Couldn't find Binary or Text savestate");
+			}
+		}*/
+
+		public void GetCoreState(Action<BinaryReader, long> callbackBinary, Action<TextReader> callbackText)
 		{
 			if (!GetLump(BinaryStateLump.Corestate, false, callbackBinary)
 			    && !GetLump(BinaryStateLump.CorestateText, false, callbackText))
@@ -215,7 +234,7 @@ namespace BizHawk.Client.Common
 		public void GetCoreState(Action<BinaryReader> callbackBinary, Action<TextReader> callbackText)
 		{
 			if (!GetLump(BinaryStateLump.Corestate, false, callbackBinary)
-			    && !GetLump(BinaryStateLump.CorestateText, false, callbackText))
+				&& !GetLump(BinaryStateLump.CorestateText, false, callbackText))
 			{
 				throw new Exception("Couldn't find Binary or Text savestate");
 			}
diff --git a/BizHawk.Client.Common/movie/bk2/Bk2Movie.IO.cs b/BizHawk.Client.Common/movie/bk2/Bk2Movie.IO.cs
index 9a84811428..eaf136748b 100644
--- a/BizHawk.Client.Common/movie/bk2/Bk2Movie.IO.cs
+++ b/BizHawk.Client.Common/movie/bk2/Bk2Movie.IO.cs
@@ -111,9 +111,9 @@ namespace BizHawk.Client.Common
 				if (StartsFromSavestate)
 				{
 					bl.GetCoreState(
-						delegate(BinaryReader br)
+						delegate(BinaryReader br, long length)
 						{
-							BinarySavestate = br.ReadBytes((int)br.BaseStream.Length);
+							BinarySavestate = br.ReadBytes((int)length);
 						},
 						delegate(TextReader tr)
 						{
diff --git a/BizHawk.Client.Common/movie/tasproj/TasMovie.IO.cs b/BizHawk.Client.Common/movie/tasproj/TasMovie.IO.cs
index 938a0375fd..77f7e67b3c 100644
--- a/BizHawk.Client.Common/movie/tasproj/TasMovie.IO.cs
+++ b/BizHawk.Client.Common/movie/tasproj/TasMovie.IO.cs
@@ -134,9 +134,9 @@ namespace BizHawk.Client.Common
 				if (StartsFromSavestate)
 				{
 					bl.GetCoreState(
-						delegate(BinaryReader br)
+						delegate(BinaryReader br, long length)
 						{
-							BinarySavestate = br.ReadBytes((int)br.BaseStream.Length);
+							BinarySavestate = br.ReadBytes((int)length);
 						},
 						delegate(TextReader tr)
 						{
@@ -145,10 +145,9 @@ namespace BizHawk.Client.Common
 				}
 
 				// TasMovie enhanced information
-				bl.GetLump(BinaryStateLump.LagLog, false, delegate(BinaryReader br)
+				bl.GetLump(BinaryStateLump.LagLog, false, delegate(BinaryReader br, long length)
 				{
-					var bytes = br.BaseStream.ReadAllBytes();
-					LagLog = bytes.ToBools().ToList();
+					LagLog = br.ReadBytes((int)length).ToBools().ToList();
 				});
 
 				bl.GetLump(BinaryStateLump.GreenzoneSettings, false, delegate(TextReader tr)
@@ -158,9 +157,9 @@ namespace BizHawk.Client.Common
 
 				if (StateManager.Settings.SaveGreenzone)
 				{
-					bl.GetLump(BinaryStateLump.Greenzone, false, delegate(BinaryReader br)
+					bl.GetLump(BinaryStateLump.Greenzone, false, delegate(BinaryReader br, long length)
 					{
-						StateManager.FromArray(br.BaseStream.ReadAllBytes());
+						StateManager.FromArray(br.ReadBytes((int)length));
 					});
 				}