Use Stream extension to ensure read operations return the requested number of bytes (unless EOF arrives first).

CRC16Context.cs

@@ -371,7 +371,7 @@ public class Crc16Context : IChecksum
         ushort[][] localTable = table ?? GenerateTable(polynomial, inverse);
 
         var buffer = new byte[65536];
-        int read   = fileStream.Read(buffer, 0, 65536);
+        int read   = fileStream.EnsureRead(buffer, 0, 65536);
 
         while(read > 0)
         {
@@ -396,7 +396,7 @@ public class Crc16Context : IChecksum
                 }
             }
 
-            read = fileStream.Read(buffer, 0, 65536);
+            read = fileStream.EnsureRead(buffer, 0, 65536);
         }
 
         localHashInt ^= seed;