diff --git a/src/common/utils.c b/src/common/utils.c
index 579f36a..e388fcd 100644
--- a/src/common/utils.c
+++ b/src/common/utils.c
@@ -124,3 +124,47 @@ void printbuf(void * buf,int size)
 
 	printf("%s\n", str);
 }
+
+const unsigned char LUT_ByteBitsInverter[]=
+{
+	0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
+	0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
+	0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
+	0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
+	0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,
+	0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
+	0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,
+	0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
+	0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,
+	0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
+	0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,
+	0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
+	0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,
+	0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
+	0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,
+	0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
+	0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,
+	0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
+	0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
+	0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
+	0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,
+	0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
+	0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,
+	0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
+	0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,
+	0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
+	0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,
+	0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
+	0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,
+	0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
+	0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,
+	0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
+};
+
+const unsigned char LUT_QuartetBitsInverter[]=
+{
+	0x0, 0x8, 0x4, 0xC,
+	0x2, 0xA, 0x6, 0xE,
+	0x1, 0x9, 0x5, 0xD,
+	0x3, 0xB, 0x7, 0xF
+};
diff --git a/src/common/utils.h b/src/common/utils.h
index e1fe23d..44a2e7e 100644
--- a/src/common/utils.h
+++ b/src/common/utils.h
@@ -28,3 +28,32 @@ void get_filename(char * path,char * filename);
 void printbuf(unsigned char * buf,int size);
 int is_printable_char(unsigned char c);
 
+
+#ifdef BIGENDIAN_HOST
+
+// big endian
+#define BIGENDIAN_WORD(wValue) (wValue)
+#define BIGENDIAN_DWORD(dwValue) (dwValue)
+
+// little endian
+
+#define LITTLEENDIAN_WORD(wValue) ( (((wValue&0xFF)<<8)) | (((wValue)>>8)&0xFF) )
+#define LITTLEENDIAN_DWORD(dwValue) ( (((dwValue&0xFF)<<24)) | (((dwValue&0xFF00)<<8)) | (((dwValue)>>8)&0xFF00) | (((dwValue)>>24)&0xFF) )
+
+#else
+
+//LITTLE ENDIAN HOST
+
+// big endian
+#define BIGENDIAN_WORD(wValue) ( (((wValue)<<8)&0xFF00) | (((wValue)>>8)&0xFF) )
+#define BIGENDIAN_DWORD(dwValue) ( (((dwValue&0xFF)<<24)) | (((dwValue&0xFF00)<<8)) | (((dwValue)>>8)&0xFF00) | (((dwValue)>>24)&0xFF) )
+
+// little endian
+
+#define LITTLEENDIAN_WORD(wValue) (wValue)
+#define LITTLEENDIAN_DWORD(dwValue) (dwValue)
+
+#endif
+
+extern const unsigned char LUT_ByteBitsInverter[];
+extern const unsigned char LUT_QuartetBitsInverter[];
\ No newline at end of file