1 files changed, 107 insertions, 0 deletions

diff --git a/src/core/cube.h b/src/core/cube.h
index fe36f90..b24fb5c 100644
--- a/src/core/cube.h
+++ b/src/core/cube.h
@@ -285,6 +285,113 @@ move(cube_t c, uint8_t m)
         }
 }
 
+_static cube_t
+premove(cube_t c, uint8_t m){
+                switch (m) {
+        case _move_U:
+                return _premove(U3, c);
+        case _move_U2:
+                return _premove(U2, c);
+        case _move_U3:
+                return _premove(U, c);
+        case _move_D:
+                return _premove(D3, c);
+        case _move_D2:
+                return _premove(D2, c);
+        case _move_D3:
+                return _premove(D, c);
+        case _move_R:
+                return _premove(R3, c);
+        case _move_R2:
+                return _premove(R2, c);
+        case _move_R3:
+                return _premove(R, c);
+        case _move_L:
+                return _premove(L3, c);
+        case _move_L2:
+                return _premove(L2, c);
+        case _move_L3:
+                return _premove(L, c);
+        case _move_F:
+                return _premove(F3, c);
+        case _move_F2:
+                return _premove(F2, c);
+        case _move_F3:
+                return _premove(F, c);
+        case _move_B:
+                return _premove(B3, c);
+        case _move_B2:
+                return _premove(B2, c);
+        case _move_B3:
+                return _premove(B, c);
+        default:
+                LOG("move error, unknown move\n");
+                return zero;
+        }
+}
+_static uint8_t
+invertmove(uint8_t m)
+{
+        switch (m) {
+        case _move_U:
+                return _move_U3;
+        case _move_U2:
+                return _move_U2;
+        case _move_U3:
+                return _move_U;
+        case _move_D:
+                return _move_D3;
+        case _move_D2:
+                return _move_D2;
+        case _move_D3:
+                return _move_D;
+        case _move_R:
+                return _move_R3;
+        case _move_R2:
+                return _move_R2;
+        case _move_R3:
+                return _move_R;
+        case _move_L:
+                return _move_L3;
+        case _move_L2:
+                return _move_L2;
+        case _move_L3:
+                return _move_L;
+        case _move_F:
+                return _move_F3;
+        case _move_F2:
+                return _move_F2;
+        case _move_F3:
+                return _move_F;
+        case _move_B:
+                return _move_B3;
+        case _move_B2:
+                return _move_B2;
+        case _move_B3:
+                return _move_B;
+        default:
+                LOG("invertmove error, unknown move\n");
+                return _error;
+        }
+}
+
+_static uint8_t*
+invertpremoves(uint8_t *moves, uint8_t nmoves)
+{
+        uint8_t i;
+        uint8_t *ret = malloc(nmoves * sizeof(uint8_t));
+
+        for (i = 0; i < nmoves; i++)
+                ret[i] = invertmove(moves[i]);
+
+        // invert elements in the array
+        for (i = 0; i < nmoves / 2; i++)
+                _swap(ret[i], ret[nmoves - i - 1]);
+        return ret;
+}
+
+
+
 /*
 TODO transform is now relegated to a separated file because it is too long.
 It would be nice to make it shorter without loosing performance.