3 files changed, 84 insertions, 0 deletions

diff --git a/src/constants.h b/src/constants.h
index 54152bc..9e0a7a7 100644
--- a/src/constants.h
+++ b/src/constants.h
@@ -69,3 +69,7 @@
 #define BRm 45
 #define BDm 46
 #define BLm 47
+
+/* Errors */
+#define errormove 99U
+#define errortrans 99U
diff --git a/src/cube.h b/src/cube.h
index 129062d..67f04bf 100644
--- a/src/cube.h
+++ b/src/cube.h
@@ -21,7 +21,12 @@ bool iserror(cube_t);
 int readmoves(char *, move_t *);
 void writemoves(move_t *, int, char *);
 
+trans_t readtrans(char *);
+void writetrans(trans_t, char *);
+
 cube_t move(cube_t, move_t);
 cube_t inverse(cube_t);
 cube_t compose(cube_t, cube_t);
+
+/* See utils/TRANSFORMATIONS.txt for how transformations are applied */
 cube_t transform(cube_t, trans_t);
diff --git a/src/cube_array.c b/src/cube_array.c
index 1d2da86..cbf59e4 100644
--- a/src/cube_array.c
+++ b/src/cube_array.c
@@ -120,6 +120,57 @@ static char *movestr[] = {
         [B3] = "B'",
 };
 
+static char *transstr[] = {
+        [UFr] = "rotation UF",
+        [UFm] = "mirrored UF",
+        [ULr] = "rotation UL",
+        [ULm] = "mirrored UL",
+        [UBr] = "rotation UB",
+        [UBm] = "mirrored UB",
+        [URr] = "rotation UR",
+        [URm] = "mirrored UR",
+        [DFr] = "rotation DF",
+        [DFm] = "mirrored DF",
+        [DLr] = "rotation DL",
+        [DLm] = "mirrored DL",
+        [DBr] = "rotation DB",
+        [DBm] = "mirrored DB",
+        [DRr] = "rotation DR",
+        [DRm] = "mirrored DR",
+        [RUr] = "rotation RU",
+        [RUm] = "mirrored RU",
+        [RFr] = "rotation RF",
+        [RFm] = "mirrored RF",
+        [RDr] = "rotation RD",
+        [RDm] = "mirrored RD",
+        [RBr] = "rotation RB",
+        [RBm] = "mirrored RB",
+        [LUr] = "rotation LU",
+        [LUm] = "mirrored LU",
+        [LFr] = "rotation LF",
+        [LFm] = "mirrored LF",
+        [LDr] = "rotation LD",
+        [LDm] = "mirrored LD",
+        [LBr] = "rotation LB",
+        [LBm] = "mirrored LB",
+        [FUr] = "rotation FU",
+        [FUm] = "mirrored FU",
+        [FRr] = "rotation FR",
+        [FRm] = "mirrored FR",
+        [FDr] = "rotation FD",
+        [FDm] = "mirrored FD",
+        [FLr] = "rotation FL",
+        [FLm] = "mirrored FL",
+        [BUr] = "rotation BU",
+        [BUm] = "mirrored BU",
+        [BRr] = "rotation BR",
+        [BRm] = "mirrored BR",
+        [BDr] = "rotation BD",
+        [BDm] = "mirrored BD",
+        [BLr] = "rotation BL",
+        [BLm] = "mirrored BL",
+};
+
 cube_t solvedcube = {
         .c = {
                 [_c_ufr] = _c_ufr,
@@ -452,6 +503,21 @@ readmoves_error:
         return -1;
 }
 
+trans_t
+readtrans(char *buf)
+{
+        uint8_t t;
+
+        for (t = 0; t < 48; t++)
+                if (!strncmp(buf, transstr[t], 11))
+                        return t;
+
+#ifdef DEBUG
+        fprintf(stderr, "readtrans error\n");
+#endif
+        return errortrans;
+}
+
 void
 writemoves(move_t *m, int n, char *buf)
 {
@@ -469,6 +535,15 @@ writemoves(move_t *m, int n, char *buf)
         *b = '\0';
 }
 
+void
+writetrans(trans_t t, char *buf)
+{
+        if (t >= 48)
+                memcpy(buf, "error trans", 11);
+        else
+                memcpy(buf, transstr[t], 11);
+        buf[11] = '\0';
+}
 
 static int
 permsign(uint8_t *a, int n)