# HG changeset patch
# User Michael Pavone <pavone@retrodev.com>
# Date 1697696834 25200
# Node ID 76dfad6a53b59483b27d0a3b793d71efc4967071
# Parent  8f3cfb77f1e3ccecca9bd6a959013a5392e68b5a
Fix bug in CD-ROM scrambling algorithm

diff -r 8f3cfb77f1e3 -r 76dfad6a53b5 cdimage.c
--- a/cdimage.c	Wed Oct 18 23:26:51 2023 -0700
+++ b/cdimage.c	Wed Oct 18 23:27:14 2023 -0700
@@ -9,10 +9,13 @@
 uint8_t cdrom_scramble(uint16_t *lsfr, uint8_t data)
 {
 	data ^= *lsfr;
-	uint16_t new_bit = *lsfr;
-	*lsfr >>= 1;
-	new_bit = (new_bit ^ *lsfr) & 1;
-	*lsfr |= new_bit << 14;
+	for (int i = 0; i < 8; i++)
+	{
+		uint16_t new_bit = *lsfr;
+		*lsfr >>= 1;
+		new_bit = (new_bit ^ *lsfr) & 1;
+		*lsfr |= new_bit << 14;
+	}
 	return data;
 }