From 2f9d00075b0d236ecd8431761bb045e6aa088001 Mon Sep 17 00:00:00 2001
From: Sebastiano Tronto <sebastiano@tronto.net>
Date: Thu, 17 Sep 2026 21:20:22 +0200
Subject: twostep solver (wip)

---
 src/solvers/twostep/twostep.h | 93 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 src/solvers/twostep/twostep.h

(limited to 'src/solvers/twostep/twostep.h')

diff --git a/src/solvers/twostep/twostep.h b/src/solvers/twostep/twostep.h
new file mode 100644
index 0000000..8947a50
--- /dev/null
+++ b/src/solvers/twostep/twostep.h
@@ -0,0 +1,93 @@
+#include "../coord/coord.h"
+
+STATIC long long dataid_twostep(const char *, char [SIZE(NISSY_SIZE_DATAID)]);
+STATIC long long gendata_twostep(
+    const char *, unsigned long long, unsigned char *);
+STATIC long long checkdata_twostep(
+    const char *, unsigned long long, const unsigned char *);
+STATIC long long solve_twostep(oriented_cube_t, const char *, unsigned,
+    unsigned, unsigned, unsigned, unsigned, unsigned, unsigned long long,
+    const unsigned char *, unsigned, char *,
+    long long [SIZE(NISSY_SIZE_SOLVE_STATS)], int (*)(void *), void *);
+
+STATIC long long
+dataid_twostep(const char *s, char dataid[SIZE(NISSY_SIZE_DATAID)])
+{
+	strcpy(dataid, "DR_DRFIN");
+	return NISSY_OK;
+}
+
+STATIC long long
+gendata_twostep(
+	const char *s,
+	unsigned long long bufsize,
+	unsigned char *buf
+)
+{
+	size_t r, s1, s2;
+
+	s1 = gendata_coord(&coordinate_dr, NULL);
+	s1 = DIV_ROUND_UP(s1, 8); /* Preserve 8-byte alignment */
+	s2 = gendata_multicoord(&multicoordinate_drfin, NULL);
+
+	if (buf == NULL)
+		goto gendata_twostep_return_size;
+
+	if (bufsize < s1 + s2)
+		return NISSY_ERROR_BUFFER_SIZE;
+
+	r = gendata_coord(&coordinate_dr, buf);
+	if (r == 0)
+		return NISSY_ERROR_UNKNOWN;
+
+	r = gendata_multicoord(&multicoordinate_drfin, buf + s1);
+	if (r != NISSY_OK)
+		return NISSY_ERROR_UNKNOWN;
+
+gendata_twostep_return_size:
+	return s1 + s2;
+}
+
+STATIC long long
+checkdata_twostep(
+	const char *s,
+	unsigned long long bufsize,
+	const unsigned char *buf
+)
+{
+	long long r;
+
+	LOG("[checkdata] Checking double table for two step solver\n");
+
+	r = checkdata_coord(&coordinate_dr, bufsize, buf);
+	if (r != NISSY_OK)
+		return r;
+
+	r = checkdata_multicoord(&multicoordinate_drfin, bufsize, buf);
+	if (r != NISSY_OK)
+		return r;
+
+	return NISSY_OK;
+}
+
+STATIC long long
+solve_twostep(
+	oriented_cube_t oc,
+	const char *coord_and_trans,
+	unsigned nissflag,
+	unsigned minmoves,
+	unsigned maxmoves,
+	unsigned maxsolutions,
+	unsigned optimal,
+	unsigned threads,
+	unsigned long long data_size,
+	const unsigned char *data,
+	unsigned solutions_size,
+	char *sols,
+	long long stats[SIZE(NISSY_SIZE_SOLVE_STATS)],
+	int (*poll_status)(void *),
+	void *poll_status_data
+)
+{
+//TODO
+}
-- 
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