1 files changed, 54 insertions, 0 deletions
diff --git a/src/drv/ps1/cd/src/toseekl.c b/src/drv/ps1/cd/src/toseekl.c
new file mode 100644
index 0000000..ee776c9
--- /dev/null
+++ b/src/drv/ps1/cd/src/toseekl.c
@@ -0,0 +1,54 @@
+/* Original functions from psn00bsdk, commit 5d9aa2d3
+ *
+ * itob extracted from libpsn00b/include/psxcd.h
+ * CdIntToPos (here renamed to drv_ps1_cd_toseekl) extracted from
+ * libpsn00b/psxcd/misc.c
+ *
+ * Original copyright notice:
+ *
+ * PSn00bSDK CD-ROM library
+ * (C) 2020-2023 Lameguy64, spicyjpeg - MPL licensed
+ */
+
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <drv/ps1/cd/routines.h>
+#include <drv/ps1/bios.h>
+
+/**
+ * @brief Translates a decimal value to BCD.
+ *
+ * @details Translates a decimal integer in 0-99 range into a BCD format value.
+ */
+static unsigned itob(const unsigned i)
+{
+    return ((i / 10) * 16) | (i % 10);
+}
+
+struct CdAsyncSeekL drv_ps1_cd_toseekl(unsigned i)
+{
+	i += 150;
+
+    return (const struct CdAsyncSeekL)
+    {
+        .minutes = itob(i / (75 * 60)),
+        .seconds = itob((i / 75) % 60),
+        .frames = itob(i % 75)
+    };
+}