Fix a bug in the core files framework with handling the BOF buffer.

- Any files where the total size was below the size of the
   default bof_buffer size couldn't have stream analyzers successfully
   attached because the bof_buffer never reached the full size
   and was never flushed.  This branch explicitly marks the buf_buffer
   as full and flushes it when the file is being removed.

src/file_analysis/File.cc

@@ -492,18 +492,22 @@ void File::EndOfFile()
 	if ( done )
 		return;
 
-	if ( ! did_mime_type &&
-	     LookupFieldDefaultCount(missing_bytes_idx) == 0 )
-		DetectMIME();
-
-	analyzers.DrainModifications();
-
 	if ( file_reassembler )
 		{
 		file_reassembler->Flush();
-		analyzers.DrainModifications();
 		}
 
+	// Mark the bof_buffer as full in case it isn't yet
+	// so that the whole thing can be flushed out to 
+	// any stream analyzers.
+	if ( ! bof_buffer.full )
+		{
+		bof_buffer.full = true;
+		DeliverStream((const u_char*) "", 0);
+		}
+
+	analyzers.DrainModifications();
+
 	done = true;
 
 	file_analysis::Analyzer* a = 0;