diff --git a/src/flip_bits.c b/src/flip_bits.c
new file mode 100644
index 0000000..f33994e
--- /dev/null
+++ b/src/flip_bits.c
@@ -0,0 +1,29 @@
+#include <stdint.h>
+#include "flip_bits.h"
+
+static uint8_t flip_table[256];
+
+void init_flip_bits(void)
+{
+        int i,k;
+
+        for (i = 0 ; i < 256 ; i++) {
+                uint8_t sample = 0 ;
+                for (k = 0; k<8; k++) {
+                        if ( i & 1 << k ) sample |= 0x80 >>  k;
+                }
+                flip_table[i] = sample;
+        }
+}
+
+uint8_t *flip_buf_bits(uint8_t *buf, int len)
+{
+        int i;
+        uint8_t *start = buf;
+
+        for (i = 0 ; i < len; i++) {
+                buf[i] = flip_table[(uint8_t)buf[i]];
+        }
+
+        return start;
+}