From c282e4fa59bc88e874aa5056a3e57fc35b3fefe5 Mon Sep 17 00:00:00 2001
From: PikalaxALT <pikalaxalt@gmail.com>
Date: Sat, 2 Dec 2017 10:19:02 -0500
Subject: [PATCH] sub_800DBF8

---
 asm/link_rfu.s     | 168 ---------------------------------------------
 include/link_rfu.h |   5 ++
 src/link_rfu.c     |  63 +++++++++++++++++
 3 files changed, 68 insertions(+), 168 deletions(-)

diff --git a/asm/link_rfu.s b/asm/link_rfu.s
index 3667d39bc3..1347ac0775 100644
--- a/asm/link_rfu.s
+++ b/asm/link_rfu.s
@@ -7,174 +7,6 @@
 
 @ file boundary?
 
-	thumb_func_start sub_800DB84
-sub_800DB84: @ 800DB84
-	push {r4,r5,lr}
-	adds r3, r0, 0
-	adds r5, r1, 0
-	movs r1, 0x80
-	lsls r1, 2
-	adds r0, r3, r1
-	adds r1, 0x1
-	adds r4, r3, r1
-	ldrb r1, [r0]
-	ldrb r0, [r4]
-	cmp r1, r0
-	beq _0800DBA6
-	ldr r1, =0x00000203
-	adds r0, r3, r1
-	ldrb r0, [r0]
-	cmp r0, 0
-	beq _0800DBB0
-_0800DBA6:
-	movs r0, 0
-	b _0800DBEA
-	.pool
-_0800DBB0:
-	movs r2, 0
-_0800DBB2:
-	adds r0, r5, r2
-	ldrb r1, [r4]
-	lsls r1, 8
-	adds r1, r2, r1
-	adds r1, r3, r1
-	ldrb r1, [r1]
-	strb r1, [r0]
-	adds r2, 0x1
-	cmp r2, 0xFF
-	ble _0800DBB2
-	ldr r0, =0x00000201
-	adds r1, r3, r0
-	ldrb r0, [r1]
-	adds r0, 0x1
-	ldrb r2, [r1]
-	strb r0, [r1]
-	ldrb r2, [r1]
-	movs r0, 0x1
-	ands r0, r2
-	ldrb r2, [r1]
-	strb r0, [r1]
-	ldr r0, =0x00000202
-	adds r1, r3, r0
-	ldrb r0, [r1]
-	subs r0, 0x1
-	ldrb r2, [r1]
-	strb r0, [r1]
-	movs r0, 0x1
-_0800DBEA:
-	pop {r4,r5}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end sub_800DB84
-
-	thumb_func_start sub_800DBF8
-sub_800DBF8: @ 800DBF8
-	push {r4-r7,lr}
-	adds r6, r0, 0
-	lsls r1, 24
-	lsrs r1, 24
-	adds r0, r1, 0
-	movs r5, 0
-	cmp r1, 0x1
-	beq _0800DC36
-	cmp r1, 0x1
-	bgt _0800DC12
-	cmp r1, 0
-	beq _0800DC1C
-	b _0800DCAA
-_0800DC12:
-	cmp r0, 0x2
-	beq _0800DC56
-	cmp r0, 0x3
-	beq _0800DC76
-	b _0800DCAA
-_0800DC1C:
-	movs r4, 0
-_0800DC1E:
-	adds r0, r6, r4
-	adds r1, r4, 0x1
-	strb r1, [r0]
-	lsls r0, r5, 16
-	asrs r0, 16
-	adds r0, r1
-	lsls r0, 16
-	lsrs r5, r0, 16
-	adds r4, r1, 0
-	cmp r4, 0xC7
-	ble _0800DC1E
-	b _0800DC70
-_0800DC36:
-	movs r4, 0
-	adds r2, r6, 0
-	adds r2, 0xC8
-_0800DC3C:
-	adds r0, r6, r4
-	adds r1, r4, 0x1
-	strb r1, [r0]
-	lsls r0, r5, 16
-	asrs r0, 16
-	adds r0, r1
-	lsls r0, 16
-	lsrs r5, r0, 16
-	adds r4, r1, 0
-	cmp r4, 0x63
-	ble _0800DC3C
-	strh r5, [r2]
-	b _0800DCAA
-_0800DC56:
-	movs r4, 0
-_0800DC58:
-	bl Random
-	lsls r0, 24
-	lsrs r0, 24
-	adds r1, r6, r4
-	strb r0, [r1]
-	adds r0, r5, r0
-	lsls r0, 16
-	lsrs r5, r0, 16
-	adds r4, 0x1
-	cmp r4, 0xC7
-	ble _0800DC58
-_0800DC70:
-	adds r0, r6, r4
-	strh r5, [r0]
-	b _0800DCAA
-_0800DC76:
-	movs r4, 0
-	ldr r3, =gUnknown_03000D74
-	ldrb r1, [r3]
-	ldrb r0, [r3]
-	adds r7, r0, 0x1
-	adds r2, r1, 0x1
-	movs r0, 0xFF
-	mov r12, r0
-_0800DC86:
-	adds r0, r6, r4
-	adds r1, r4, 0x1
-	strb r2, [r0]
-	adds r0, r4, r7
-	mov r4, r12
-	ands r0, r4
-	adds r0, r5, r0
-	lsls r0, 16
-	lsrs r5, r0, 16
-	adds r2, 0x1
-	adds r4, r1, 0
-	cmp r1, 0xC7
-	ble _0800DC86
-	adds r0, r6, r1
-	strh r5, [r0]
-	ldrb r0, [r3]
-	adds r0, 0x1
-	strb r0, [r3]
-_0800DCAA:
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_800DBF8
-
 	thumb_func_start sub_800DCB4
 sub_800DCB4: @ 800DCB4
 	push {r4,r5,lr}
diff --git a/include/link_rfu.h b/include/link_rfu.h
index 28e244503d..f02a0baef9 100644
--- a/include/link_rfu.h
+++ b/include/link_rfu.h
@@ -109,6 +109,11 @@ struct UnkRfuStruct_Sub_Unused {
     /* 0x203 */ vu8 unk_203;
 };
 
+struct UnkRfuStruct_Sub_Unused2 {
+    /* 0x000 */ u8 unk_00[200];
+    /* 0x0c8 */ u16 unk_c8;
+};
+
 struct UnkRfuStruct_2 {
     /* 0x000 */ u8 filler_00[13];
     /* 0x00d */ u8 playerCount;
diff --git a/src/link_rfu.c b/src/link_rfu.c
index 63776a298b..608a6bdd30 100644
--- a/src/link_rfu.c
+++ b/src/link_rfu.c
@@ -1,6 +1,7 @@
 
 // Includes
 #include "global.h"
+#include "rng.h"
 #include "link.h"
 #include "librfu.h"
 #include "link_rfu.h"
@@ -1665,3 +1666,65 @@ void sub_800DB18(struct UnkRfuStruct_Sub_Unused *q1, u8 *q2)
         q1->unk_203 = 1;
     }
 }
+
+bool8 sub_800DB84(struct UnkRfuStruct_Sub_Unused *q1, u8 *q2)
+{
+    int i;
+
+    if (q1->unk_200 == q1->unk_201 || q1->unk_203)
+    {
+        return FALSE;
+    }
+    for (i = 0; i < 256; i++)
+    {
+        q2[i] = q1->unk_00[q1->unk_201][i];
+    }
+    q1->unk_201++;
+    q1->unk_201 %= 2;
+    q1->unk_202--;
+    return TRUE;
+}
+
+void sub_800DBF8(struct UnkRfuStruct_Sub_Unused2 *q1, u8 mode)
+{
+    int i;
+    u8 rval;
+    u16 r5 = 0;
+    switch (mode)
+    {
+        case 0:
+            for (i = 0; i < 200; i++)
+            {
+                q1->unk_00[i] = i + 1;
+                r5 += i + 1;
+            }
+            *((u16 *)(q1->unk_00 + i)) = r5;
+            break;
+        case 1:
+            for (i = 0; i < 100; i++)
+            {
+                q1->unk_00[i] = i + 1;
+                r5 += i + 1;
+            }
+            *((u16 *)(q1->unk_00 + 200)) = r5;
+            break;
+        case 2:
+            for (i = 0; i < 200; i++)
+            {
+                rval = Random();
+                q1->unk_00[i] = rval;
+                r5 += rval;
+            }
+            *((u16 *)(q1->unk_00 + i)) = r5;
+            break;
+        case 3:
+            for (i = 0; i < 200; i++)
+            {
+                q1->unk_00[i] = i + 1 + gUnknown_03000D74;
+                r5 += (i + 1 + gUnknown_03000D74) & 0xFF;
+            }
+            *((u16 *)(q1->unk_00 + i)) = r5;
+            gUnknown_03000D74++;
+            break;
+    }
+}