diff --git a/src/main.cc b/src/main.cc
index 004f63f..8aa6c03 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -130,5 +130,7 @@ int main() {
     auto r = RawCode(0x0E58FC85FFEBC4DB);
     printf("%016lX\n", r.unwrap());
 
+    std::cout << r.to_common_code().to_string() << std::endl;
+
     return 0;
 }
diff --git a/src/raw_code/raw_code.cc b/src/raw_code/raw_code.cc
index b5b77a4..e1ef64d 100644
--- a/src/raw_code/raw_code.cc
+++ b/src/raw_code/raw_code.cc
@@ -3,3 +3,41 @@
 uint64_t RawCode::unwrap() const { // get raw uint64_t code
     return code;
 }
+
+CommonCode RawCode::to_common_code() const {
+    uint32_t range = 0;
+    uint64_t raw_code = code;
+    uint32_t unfilled_num = 16;
+    uint64_t head = ((uint64_t)16 << 32); // using invalid address
+
+    for (int addr = 0; raw_code; ++addr, raw_code >>= 3) {
+        switch (raw_code & 0b111) { // get low 3-bits
+            case B_space:
+                range <<= 2; // add space block
+                break;
+            case B_1x2:
+                (range <<= 2) |= 0b01; // add 1x2 block
+                break;
+            case B_2x1:
+                (range <<= 2) |= 0b10; // add 2x1 block
+                break;
+            case B_1x1:
+                (range <<= 2) |= 0b11; // add 1x1 block
+                break;
+            case B_2x2:
+                head = (uint64_t)addr << 32; // 2x2 block address
+            default:
+                // TODO: should we throw an error?
+                continue; // unknown block type
+        }
+        --unfilled_num; // less unfilled block
+    }
+    // TODO: should we check the high 4-bits equal to zero?
+
+//    printf("head -> %09lX\n", head);
+//    printf("range -> %08X\n", range << 10);
+//    printf("unfilled -> %d\n", unfilled_num);
+
+    unfilled_num <<= 1; // aka unfilled_num *= 2
+    return CommonCode(head | (range << unfilled_num));
+}
diff --git a/src/raw_code/raw_code.h b/src/raw_code/raw_code.h
index 3888010..6ded375 100644
--- a/src/raw_code/raw_code.h
+++ b/src/raw_code/raw_code.h
@@ -3,6 +3,13 @@
 #include <cstdint>
 #include "common_code.h"
 
+#define B_space 0x0
+#define B_fill  0x7
+#define B_1x2   0x1
+#define B_2x1   0x2
+#define B_1x1   0x3
+#define B_2x2   0x4
+
 class RawCode {
 public:
     uint64_t unwrap() const;