diff --git a/lib/fec.c b/lib/fec.c
index 4097e98..a392901 100644
--- a/lib/fec.c
+++ b/lib/fec.c
@@ -46,6 +46,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+typedef unsigned long u_long;
 /*
  * compatibility stuff
  */
diff --git a/main.cpp b/main.cpp
index 14f29d9..1ab0e1a 100644
--- a/main.cpp
+++ b/main.cpp
@@ -923,6 +923,42 @@ int event_loop()
 	myexit(0);
 	return 0;
 }
+int unit_test()
+{
+	int i,j,k;
+	void *code=fec_new(3,6);
+	char arr[6][100]=
+	{
+		"aaa","bbb","ccc"
+		,"ddd","eee","fff"
+	};
+	char *data[6];
+	for(i=0;i<6;i++)
+	{
+		data[i]=arr[i];
+	}
+	rs_encode(code,data,3);
+	printf("%d %d",(int)(unsigned char)arr[5][0],(int)('a'^'b'^'c'^'d'^'e'));
+
+	for(i=0;i<6;i++)
+	{
+		printf("<%s>",data[i]);
+	}
+
+	data[0]=0;
+	data[1]=0;
+	data[2]=0;
+
+	int ret=rs_decode(code,data,3);
+	printf("ret:%d\n",ret);
+
+	for(i=0;i<6;i++)
+	{
+		printf("<%s>",data[i]);
+	}
+	fec_free(code);
+	return 0;
+}
 void print_help()
 {
 	char git_version_buf[100]={0};
@@ -987,6 +1023,14 @@ void process_arg(int argc, char *argv[])
 		myexit( -1);
 	}
 	for (i = 0; i < argc; i++)
+	{
+		if(strcmp(argv[i],"--unit-test")==0)
+		{
+			unit_test();
+			myexit(0);
+		}
+	}
+	for (i = 0; i < argc; i++)
 	{
 		if(strcmp(argv[i],"-h")==0||strcmp(argv[i],"--help")==0)
 		{
@@ -1232,6 +1276,7 @@ void process_arg(int argc, char *argv[])
 		myexit(-1);
 	}
 }
+
 int main(int argc, char *argv[])
 {
 	assert(sizeof(u64_t)==8);
diff --git a/makefile b/makefile
index 9855d6a..086e918 100755
--- a/makefile
+++ b/makefile
@@ -8,7 +8,7 @@ cc_arm= /toolchains/arm-2014.05/bin/arm-none-linux-gnueabi-g++
 #cc_bcm2708=/home/wangyu/raspberry/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-g++ 
 FLAGS= -std=c++11   -Wall -Wextra -Wno-unused-variable -Wno-unused-parameter -Wno-missing-field-initializers
 
-SOURCES=main.cpp log.cpp common.cpp lib/fec.c lib/rs.c
+SOURCES=main.cpp log.cpp common.cpp lib/fec.c lib/rs.c 
 
 NAME=speeder
 TARGETS=amd64 arm mips24kc_be x86  mips24kc_le