added another XP3 encryption scheme.

ArcFormats/KiriKiri/ArcXP3.cs

@@ -1173,6 +1173,34 @@ NextEntry:
         }
     }
 
+    [Serializable]
+    public class GakuenButouCrypt : ICrypt
+    {
+        public override byte Decrypt (Xp3Entry entry, long offset, byte value)
+        {
+            if (0 != (offset & 1))
+                return (byte)(value ^ offset);
+            else
+                return (byte)(value ^ entry.Hash);
+        }
+
+        public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
+        {
+            for (int i = 0; i < count; ++i, ++offset)
+            {
+                if (0 != (offset & 1))
+                    values[pos+i] ^= (byte)offset;
+                else
+                    values[pos+i] ^= (byte)entry.Hash;
+            }
+        }
+
+        public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
+        {
+            Decrypt (entry, offset, values, pos, count);
+        }
+    }
+
     [Serializable]
     public class AlteredPinkCrypt : ICrypt
     {

supported.html

@@ -170,6 +170,7 @@ Distance<br/>
 Fate/stay night<br/>
 Fate/hollow ataraxia<br/>
 G-senjou no Maou<br/>
+Gakuen Butou no Folklore<br/>
 Hanafubuki ~Sennen no Koi o Shimashita~<br/>
 Haruiro ☆ Communication ♪<br/>
 Hime to Majin to Koi Suru Tamashii<br/>