util

5 files changed, 518 insertions, 512 deletions

diff --git a/asm/util.s b/asm/util.s
deleted file mode 100644
index a3efaa8f2..000000000
--- a/asm/util.s
+++ /dev/null
@@ -1,500 +0,0 @@
-	.include "asm/macros.inc"
-	.include "constants/constants.inc"
-
-	.syntax unified
-
-	.text
-
-	thumb_func_start CreateInvisibleSpriteWithCallback
-CreateInvisibleSpriteWithCallback: @ 8044EF8
-	push {r4-r6,lr}
-	adds r6, r0, 0
-	ldr r0, _08044F2C @ =gUnknown_825E4DC
-	movs r1, 0xF8
-	movs r2, 0xA8
-	movs r3, 0xE
-	bl CreateSprite
-	lsls r0, 24
-	lsrs r0, 24
-	ldr r5, _08044F30 @ =gSprites
-	lsls r2, r0, 4
-	adds r2, r0
-	lsls r2, 2
-	adds r3, r2, r5
-	adds r3, 0x3E
-	ldrb r1, [r3]
-	movs r4, 0x4
-	orrs r1, r4
-	strb r1, [r3]
-	adds r5, 0x1C
-	adds r2, r5
-	str r6, [r2]
-	pop {r4-r6}
-	pop {r1}
-	bx r1
-	.align 2, 0
-_08044F2C: .4byte gUnknown_825E4DC
-_08044F30: .4byte gSprites
-	thumb_func_end CreateInvisibleSpriteWithCallback
-
-	thumb_func_start StoreWordInTwoHalfwords
-StoreWordInTwoHalfwords: @ 8044F34
-	strh r1, [r0]
-	lsrs r1, 16
-	strh r1, [r0, 0x2]
-	bx lr
-	thumb_func_end StoreWordInTwoHalfwords
-
-	thumb_func_start LoadWordFromTwoHalfwords
-LoadWordFromTwoHalfwords: @ 8044F3C
-	ldrh r2, [r0]
-	movs r3, 0x2
-	ldrsh r0, [r0, r3]
-	lsls r0, 16
-	orrs r2, r0
-	str r2, [r1]
-	bx lr
-	thumb_func_end LoadWordFromTwoHalfwords
-
-	thumb_func_start SetBgAffineStruct
-SetBgAffineStruct: @ 8044F4C
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	ldr r4, [sp, 0x18]
-	ldr r5, [sp, 0x1C]
-	ldr r6, [sp, 0x20]
-	ldr r7, [sp, 0x24]
-	mov r8, r7
-	str r1, [r0]
-	str r2, [r0, 0x4]
-	strh r3, [r0, 0x8]
-	strh r4, [r0, 0xA]
-	strh r5, [r0, 0xC]
-	strh r6, [r0, 0xE]
-	mov r1, r8
-	strh r1, [r0, 0x10]
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	thumb_func_end SetBgAffineStruct
-
-	thumb_func_start DoBgAffineSet
-DoBgAffineSet: @ 8044F78
-	push {r4-r6,lr}
-	mov r6, r8
-	push {r6}
-	sub sp, 0x24
-	mov r8, r0
-	ldr r0, [sp, 0x38]
-	ldr r4, [sp, 0x3C]
-	ldr r5, [sp, 0x40]
-	ldr r6, [sp, 0x44]
-	lsls r6, 16
-	lsrs r6, 16
-	lsls r3, 16
-	asrs r3, 16
-	lsls r0, 16
-	asrs r0, 16
-	str r0, [sp]
-	lsls r4, 16
-	asrs r4, 16
-	str r4, [sp, 0x4]
-	lsls r5, 16
-	asrs r5, 16
-	str r5, [sp, 0x8]
-	str r6, [sp, 0xC]
-	add r0, sp, 0x10
-	bl SetBgAffineStruct
-	add r0, sp, 0x10
-	mov r1, r8
-	movs r2, 0x1
-	bl BgAffineSet
-	add sp, 0x24
-	pop {r3}
-	mov r8, r3
-	pop {r4-r6}
-	pop {r0}
-	bx r0
-	thumb_func_end DoBgAffineSet
-
-	thumb_func_start CopySpriteTiles
-CopySpriteTiles: @ 8044FC4
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	sub sp, 0x3C
-	str r2, [sp, 0x20]
-	adds r4, r3, 0
-	ldr r7, [sp, 0x5C]
-	lsls r0, 24
-	lsls r1, 24
-	ldr r2, _0804504C @ =gUnknown_825E4F4
-	lsrs r1, 23
-	lsrs r0, 21
-	adds r1, r0
-	adds r0, r2, 0x1
-	adds r0, r1, r0
-	ldrb r0, [r0]
-	str r0, [sp, 0x24]
-	adds r1, r2
-	ldrb r1, [r1]
-	str r1, [sp, 0x28]
-	movs r1, 0
-	cmp r1, r0
-	bcc _08044FF8
-	b _0804517A
-_08044FF8:
-	movs r0, 0x20
-	ldr r2, [sp, 0x28]
-	subs r0, r2
-	lsls r0, 1
-	str r0, [sp, 0x2C]
-_08045002:
-	movs r2, 0
-	adds r1, 0x1
-	str r1, [sp, 0x34]
-	ldr r3, [sp, 0x28]
-	cmp r2, r3
-	bcc _08045010
-	b _08045168
-_08045010:
-	ldr r0, _08045050 @ =0x040000d4
-	mov r8, r0
-_08045014:
-	ldrh r1, [r4]
-	ldr r0, _08045054 @ =0x000003ff
-	ands r0, r1
-	lsls r0, 5
-	mov r12, r0
-	movs r0, 0xC0
-	lsls r0, 4
-	ands r0, r1
-	mov r3, sp
-	strh r1, [r3, 0x38]
-	cmp r0, 0
-	bne _0804505C
-	ldr r0, [sp, 0x20]
-	add r0, r12
-	mov r1, r8
-	str r0, [r1]
-	str r7, [r1, 0x4]
-	ldr r3, _08045058 @ =0x84000008
-	str r3, [r1, 0x8]
-	ldr r0, [r1, 0x8]
-	adds r4, 0x2
-	str r4, [sp, 0x30]
-	adds r7, 0x20
-	mov r10, r7
-	adds r2, 0x1
-	mov r9, r2
-	b _08045156
-	.align 2, 0
-_0804504C: .4byte gUnknown_825E4F4
-_08045050: .4byte 0x040000d4
-_08045054: .4byte 0x000003ff
-_08045058: .4byte 0x84000008
-_0804505C:
-	movs r1, 0x80
-	lsls r1, 4
-	cmp r0, r1
-	bne _080450AC
-	movs r3, 0
-	adds r4, 0x2
-	str r4, [sp, 0x30]
-	movs r0, 0x20
-	adds r0, r7
-	mov r10, r0
-	adds r2, 0x1
-	mov r9, r2
-	ldr r4, _080450A4 @ =0x040000d4
-	ldr r6, _080450A8 @ =0x84000001
-	movs r5, 0x7
-_0804507A:
-	lsls r2, r3, 24
-	asrs r2, 24
-	subs r0, r5, r2
-	lsls r0, 2
-	add r0, r12
-	ldr r1, [sp, 0x20]
-	adds r0, r1, r0
-	lsls r1, r2, 2
-	adds r1, r7, r1
-	str r0, [r4]
-	str r1, [r4, 0x4]
-	str r6, [r4, 0x8]
-	ldr r0, [r4, 0x8]
-	adds r2, 0x1
-	lsls r2, 24
-	lsrs r3, r2, 24
-	asrs r2, 24
-	cmp r2, 0x7
-	ble _0804507A
-	b _08045156
-	.align 2, 0
-_080450A4: .4byte 0x040000d4
-_080450A8: .4byte 0x84000001
-_080450AC:
-	movs r3, 0
-	adds r4, 0x2
-	str r4, [sp, 0x30]
-	movs r0, 0x20
-	adds r0, r7
-	mov r10, r0
-	adds r2, 0x1
-	mov r9, r2
-_080450BC:
-	movs r2, 0
-	lsls r4, r3, 24
-	lsls r0, r4, 2
-	lsrs r0, 24
-	adds r6, r0, 0x3
-	mov r1, r12
-	adds r5, r1, r0
-_080450CA:
-	lsls r1, r2, 24
-	asrs r1, 24
-	subs r0, r6, r1
-	mov r2, sp
-	adds r3, r2, r0
-	adds r0, r5, r1
-	ldr r2, [sp, 0x20]
-	adds r0, r2, r0
-	ldrb r2, [r0]
-	movs r0, 0xF
-	ands r0, r2
-	lsls r0, 4
-	lsrs r2, 4
-	orrs r0, r2
-	strb r0, [r3]
-	adds r1, 0x1
-	lsls r1, 24
-	lsrs r2, r1, 24
-	asrs r1, 24
-	cmp r1, 0x3
-	ble _080450CA
-	movs r3, 0x80
-	lsls r3, 17
-	adds r0, r4, r3
-	lsrs r3, r0, 24
-	asrs r0, 24
-	cmp r0, 0x7
-	ble _080450BC
-	movs r0, 0x80
-	lsls r0, 4
-	mov r1, sp
-	ldrh r1, [r1, 0x38]
-	ands r0, r1
-	cmp r0, 0
-	beq _08045148
-	movs r3, 0
-	ldr r4, _08045140 @ =0x040000d4
-	ldr r6, _08045144 @ =0x84000001
-	movs r5, 0x7
-_08045118:
-	lsls r1, r3, 24
-	asrs r1, 24
-	subs r0, r5, r1
-	lsls r0, 2
-	mov r3, sp
-	adds r2, r3, r0
-	lsls r0, r1, 2
-	adds r0, r7, r0
-	str r2, [r4]
-	str r0, [r4, 0x4]
-	str r6, [r4, 0x8]
-	ldr r0, [r4, 0x8]
-	adds r1, 0x1
-	lsls r1, 24
-	lsrs r3, r1, 24
-	asrs r1, 24
-	cmp r1, 0x7
-	ble _08045118
-	b _08045156
-	.align 2, 0
-_08045140: .4byte 0x040000d4
-_08045144: .4byte 0x84000001
-_08045148:
-	mov r0, sp
-	mov r1, r8
-	str r0, [r1]
-	str r7, [r1, 0x4]
-	ldr r2, _0804518C @ =0x84000008
-	str r2, [r1, 0x8]
-	ldr r0, [r1, 0x8]
-_08045156:
-	ldr r4, [sp, 0x30]
-	mov r7, r10
-	mov r3, r9
-	lsls r0, r3, 24
-	lsrs r2, r0, 24
-	ldr r0, [sp, 0x28]
-	cmp r2, r0
-	bcs _08045168
-	b _08045014
-_08045168:
-	ldr r1, [sp, 0x2C]
-	adds r4, r1
-	ldr r2, [sp, 0x34]
-	lsls r0, r2, 24
-	lsrs r1, r0, 24
-	ldr r3, [sp, 0x24]
-	cmp r1, r3
-	bcs _0804517A
-	b _08045002
-_0804517A:
-	add sp, 0x3C
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.align 2, 0
-_0804518C: .4byte 0x84000008
-	thumb_func_end CopySpriteTiles
-
-	thumb_func_start CountTrailingZeroBits
-CountTrailingZeroBits: @ 8045190
-	push {lr}
-	adds r2, r0, 0
-	movs r1, 0
-	movs r3, 0x1
-_08045198:
-	adds r0, r2, 0
-	ands r0, r3
-	cmp r0, 0
-	beq _080451A4
-	adds r0, r1, 0
-	b _080451B2
-_080451A4:
-	lsrs r2, 1
-	adds r0, r1, 0x1
-	lsls r0, 24
-	lsrs r1, r0, 24
-	cmp r1, 0x1F
-	bls _08045198
-	movs r0, 0
-_080451B2:
-	pop {r1}
-	bx r1
-	thumb_func_end CountTrailingZeroBits
-
-	thumb_func_start CalcCRC16
-CalcCRC16: @ 80451B8
-	push {r4-r7,lr}
-	adds r7, r0, 0
-	adds r4, r1, 0
-	ldr r2, _080451E8 @ =0x00001121
-	movs r3, 0
-	cmp r3, r4
-	bcs _08045204
-	movs r6, 0x1
-	ldr r0, _080451EC @ =0x00008408
-	adds r5, r0, 0
-_080451CC:
-	adds r0, r7, r3
-	ldrb r0, [r0]
-	eors r2, r0
-	movs r1, 0
-	adds r3, 0x1
-_080451D6:
-	adds r0, r2, 0
-	ands r0, r6
-	cmp r0, 0
-	beq _080451F0
-	lsrs r0, r2, 1
-	eors r0, r5
-	lsls r0, 16
-	lsrs r2, r0, 16
-	b _080451F2
-	.align 2, 0
-_080451E8: .4byte 0x00001121
-_080451EC: .4byte 0x00008408
-_080451F0:
-	lsrs r2, 1
-_080451F2:
-	adds r0, r1, 0x1
-	lsls r0, 16
-	lsrs r1, r0, 16
-	cmp r1, 0x7
-	bls _080451D6
-	lsls r0, r3, 16
-	lsrs r3, r0, 16
-	cmp r3, r4
-	bcc _080451CC
-_08045204:
-	mvns r0, r2
-	lsls r0, 16
-	lsrs r0, 16
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	thumb_func_end CalcCRC16
-
-	thumb_func_start CalcCRC16WithTable
-CalcCRC16WithTable: @ 8045210
-	push {r4-r6,lr}
-	adds r5, r0, 0
-	adds r4, r1, 0
-	ldr r2, _0804524C @ =0x00001121
-	movs r3, 0
-	cmp r3, r4
-	bcs _0804523E
-	ldr r6, _08045250 @ =gUnknown_825E50C
-_08045220:
-	lsrs r1, r2, 8
-	adds r0, r5, r3
-	ldrb r0, [r0]
-	eors r2, r0
-	lsls r0, r2, 24
-	lsrs r0, 23
-	adds r0, r6
-	ldrh r0, [r0]
-	adds r2, r0, 0
-	eors r2, r1
-	adds r0, r3, 0x1
-	lsls r0, 16
-	lsrs r3, r0, 16
-	cmp r3, r4
-	bcc _08045220
-_0804523E:
-	mvns r0, r2
-	lsls r0, 16
-	lsrs r0, 16
-	pop {r4-r6}
-	pop {r1}
-	bx r1
-	.align 2, 0
-_0804524C: .4byte 0x00001121
-_08045250: .4byte gUnknown_825E50C
-	thumb_func_end CalcCRC16WithTable
-
-	thumb_func_start CalcByteArraySum
-CalcByteArraySum: @ 8045254
-	push {r4,lr}
-	adds r4, r0, 0
-	movs r3, 0
-	movs r2, 0
-	cmp r3, r1
-	bcs _0804526C
-_08045260:
-	adds r0, r4, r2
-	ldrb r0, [r0]
-	adds r3, r0
-	adds r2, 0x1
-	cmp r2, r1
-	bcc _08045260
-_0804526C:
-	adds r0, r3, 0
-	pop {r4}
-	pop {r1}
-	bx r1
-	thumb_func_end CalcByteArraySum
-
-	.align 2, 0 @ Don't pad with nop.
diff --git a/data/data.s b/data/data.s
index eb704206c..9041b991e 100644
--- a/data/data.s
+++ b/data/data.s
@@ -553,17 +553,9 @@ gSineTable:: @ 825E074
 gUnknown_825E2F4:: @ 825E2F4
 	.incbin "baserom.gba", 0x25E2F4, 0x168
 
-gBitTable:: @ 825E45C
-	.incbin "baserom.gba", 0x25E45C, 0x80
+	.section .rodata.825EF0C
 
-gUnknown_825E4DC:: @ 825E4DC
-	.incbin "baserom.gba", 0x25E4DC, 0x18
-
-gUnknown_825E4F4:: @ 825E4F4
-	.incbin "baserom.gba", 0x25E4F4, 0x18
-
-gUnknown_825E50C:: @ 825E50C
-	.incbin "baserom.gba", 0x25E50C, 0xA00
+	.incbin "baserom.gba", 0x25E70C, 0x800
 
 gUnknown_825EF0C:: @ 825EF0C
 	.incbin "baserom.gba", 0x25EF0C, 0x8E8
diff --git a/include/util.h b/include/util.h
index 884bd8f33..3884ab21c 100644
--- a/include/util.h
+++ b/include/util.h
@@ -12,7 +12,7 @@ u8 CreateInvisibleSpriteWithCallback(void (*)(struct Sprite *));
 void StoreWordInTwoHalfwords(u16 *, u32);
 void LoadWordFromTwoHalfwords(u16 *, u32 *);
 int CountTrailingZeroBits(u32 value);
-u16 CalcCRC16(const u8 *data, s32 length);
+u16 CalcCRC16(const u8 *data, u32 length);
 u16 CalcCRC16WithTable(const u8 *data, u32 length);
 u32 CalcByteArraySum(const u8* data, u32 length);
 void BlendPalette(u16 palOffset, u16 numEntries, u8 coeff, u16 blendColor);
diff --git a/ld_script.txt b/ld_script.txt
index b59fce167..e60cdb4da 100644
--- a/ld_script.txt
+++ b/ld_script.txt
@@ -79,7 +79,7 @@ SECTIONS {
         asm/pokemon_3.o(.text);
         asm/trig.o(.text);
         src/random.o(.text);
-        asm/util.o(.text);
+        src/util.o(.text);
         asm/blend_palette.o(.text);
         asm/daycare.o(.text);
         asm/egg_hatch.o(.text);
@@ -363,6 +363,8 @@ SECTIONS {
         src/bg_regs.o(.rodata);
         src/string_util.o(.rodata);
         data/data.o(.rodata);
+        src/util.o(.rodata);
+        data/data.o(.rodata.825EF0C);
         data/connections.o(.rodata);
         src/fieldmap.o(.rodata);
         src/metatile_behavior.o(.rodata);
diff --git a/src/util.c b/src/util.c
new file mode 100644
index 000000000..3ab6c02bc
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,512 @@
+#include "global.h"
+#include "util.h"
+
+const u32 gBitTable[] =
+{
+    1 << 0,
+    1 << 1,
+    1 << 2,
+    1 << 3,
+    1 << 4,
+    1 << 5,
+    1 << 6,
+    1 << 7,
+    1 << 8,
+    1 << 9,
+    1 << 10,
+    1 << 11,
+    1 << 12,
+    1 << 13,
+    1 << 14,
+    1 << 15,
+    1 << 16,
+    1 << 17,
+    1 << 18,
+    1 << 19,
+    1 << 20,
+    1 << 21,
+    1 << 22,
+    1 << 23,
+    1 << 24,
+    1 << 25,
+    1 << 26,
+    1 << 27,
+    1 << 28,
+    1 << 29,
+    1 << 30,
+    1 << 31,
+};
+
+static const struct SpriteTemplate gInvisibleSpriteTemplate =
+{
+    .tileTag = 0,
+    .paletteTag = 0,
+    .oam = &gDummyOamData,
+    .anims = gDummySpriteAnimTable,
+    .images = NULL,
+    .affineAnims = gDummySpriteAffineAnimTable,
+    .callback = SpriteCallbackDummy,
+};
+
+static const u8 sSpriteDimensions[3][4][2] =
+{
+    // square
+    {
+        {1, 1},
+        {2, 2},
+        {4, 4},
+        {8, 8},
+    },
+
+    // horizontal rectangle
+    {
+        {2, 1},
+        {4, 1},
+        {4, 2},
+        {8, 4},
+    },
+
+    // vertical rectangle
+    {
+        {1, 2},
+        {1, 4},
+        {2, 4},
+        {4, 8},
+    },
+};
+
+static const u16 gCrc16Table[] =
+{
+    0x0000, 0x1189, 0x2312, 0x329B, 0x4624, 0x57AD, 0x6536, 0x74BF,
+    0x8C48, 0x9DC1, 0xAF5A, 0xBED3, 0xCA6C, 0xDBE5, 0xE97E, 0xF8F7,
+    0x1081, 0x0108, 0x3393, 0x221A, 0x56A5, 0x472C, 0x75B7, 0x643E,
+    0x9CC9, 0x8D40, 0xBFDB, 0xAE52, 0xDAED, 0xCB64, 0xF9FF, 0xE876,
+    0x2102, 0x308B, 0x0210, 0x1399, 0x6726, 0x76AF, 0x4434, 0x55BD,
+    0xAD4A, 0xBCC3, 0x8E58, 0x9FD1, 0xEB6E, 0xFAE7, 0xC87C, 0xD9F5,
+    0x3183, 0x200A, 0x1291, 0x0318, 0x77A7, 0x662E, 0x54B5, 0x453C,
+    0xBDCB, 0xAC42, 0x9ED9, 0x8F50, 0xFBEF, 0xEA66, 0xD8FD, 0xC974,
+    0x4204, 0x538D, 0x6116, 0x709F, 0x0420, 0x15A9, 0x2732, 0x36BB,
+    0xCE4C, 0xDFC5, 0xED5E, 0xFCD7, 0x8868, 0x99E1, 0xAB7A, 0xBAF3,
+    0x5285, 0x430C, 0x7197, 0x601E, 0x14A1, 0x0528, 0x37B3, 0x263A,
+    0xDECD, 0xCF44, 0xFDDF, 0xEC56, 0x98E9, 0x8960, 0xBBFB, 0xAA72,
+    0x6306, 0x728F, 0x4014, 0x519D, 0x2522, 0x34AB, 0x0630, 0x17B9,
+    0xEF4E, 0xFEC7, 0xCC5C, 0xDDD5, 0xA96A, 0xB8E3, 0x8A78, 0x9BF1,
+    0x7387, 0x620E, 0x5095, 0x411C, 0x35A3, 0x242A, 0x16B1, 0x0738,
+    0xFFCF, 0xEE46, 0xDCDD, 0xCD54, 0xB9EB, 0xA862, 0x9AF9, 0x8B70,
+    0x8408, 0x9581, 0xA71A, 0xB693, 0xC22C, 0xD3A5, 0xE13E, 0xF0B7,
+    0x0840, 0x19C9, 0x2B52, 0x3ADB, 0x4E64, 0x5FED, 0x6D76, 0x7CFF,
+    0x9489, 0x8500, 0xB79B, 0xA612, 0xD2AD, 0xC324, 0xF1BF, 0xE036,
+    0x18C1, 0x0948, 0x3BD3, 0x2A5A, 0x5EE5, 0x4F6C, 0x7DF7, 0x6C7E,
+    0xA50A, 0xB483, 0x8618, 0x9791, 0xE32E, 0xF2A7, 0xC03C, 0xD1B5,
+    0x2942, 0x38CB, 0x0A50, 0x1BD9, 0x6F66, 0x7EEF, 0x4C74, 0x5DFD,
+    0xB58B, 0xA402, 0x9699, 0x8710, 0xF3AF, 0xE226, 0xD0BD, 0xC134,
+    0x39C3, 0x284A, 0x1AD1, 0x0B58, 0x7FE7, 0x6E6E, 0x5CF5, 0x4D7C,
+    0xC60C, 0xD785, 0xE51E, 0xF497, 0x8028, 0x91A1, 0xA33A, 0xB2B3,
+    0x4A44, 0x5BCD, 0x6956, 0x78DF, 0x0C60, 0x1DE9, 0x2F72, 0x3EFB,
+    0xD68D, 0xC704, 0xF59F, 0xE416, 0x90A9, 0x8120, 0xB3BB, 0xA232,
+    0x5AC5, 0x4B4C, 0x79D7, 0x685E, 0x1CE1, 0x0D68, 0x3FF3, 0x2E7A,
+    0xE70E, 0xF687, 0xC41C, 0xD595, 0xA12A, 0xB0A3, 0x8238, 0x93B1,
+    0x6B46, 0x7ACF, 0x4854, 0x59DD, 0x2D62, 0x3CEB, 0x0E70, 0x1FF9,
+    0xF78F, 0xE606, 0xD49D, 0xC514, 0xB1AB, 0xA022, 0x92B9, 0x8330,
+    0x7BC7, 0x6A4E, 0x58D5, 0x495C, 0x3DE3, 0x2C6A, 0x1EF1, 0x0F78,
+};
+
+
+u8 CreateInvisibleSpriteWithCallback(void (*callback)(struct Sprite *))
+{
+    u8 sprite = CreateSprite(&gInvisibleSpriteTemplate, 248, 168, 14);
+    gSprites[sprite].invisible = TRUE;
+    gSprites[sprite].callback = callback;
+    return sprite;
+}
+
+void StoreWordInTwoHalfwords(u16 *h, u32 w)
+{
+    h[0] = (u16)(w);
+    h[1] = (u16)(w >> 16);
+}
+
+void LoadWordFromTwoHalfwords(u16 *h, u32 *w)
+{
+    *w = h[0] | (s16)h[1] << 16;
+}
+
+void SetBgAffineStruct(struct BgAffineSrcData *src, u32 texX, u32 texY, s16 scrX, s16 scrY, s16 sx, s16 sy, u16 alpha)
+{
+    src->texX = texX;
+    src->texY = texY;
+    src->scrX = scrX;
+    src->scrY = scrY;
+    src->sx = sx;
+    src->sy = sy;
+    src->alpha = alpha;
+}
+
+void DoBgAffineSet(struct BgAffineDstData *dest, u32 texX, u32 texY, s16 scrX, s16 scrY, s16 sx, s16 sy, u16 alpha)
+{
+    struct BgAffineSrcData src;
+
+    SetBgAffineStruct(&src, texX, texY, scrX, scrY, sx, sy, alpha);
+    BgAffineSet(&src, dest, 1);
+}
+
+#ifdef NONMATCHING
+void CopySpriteTiles(u8 shape, u8 size, u8 *tiles, u16 *tilemap, u8 *output)
+{
+    u8 x, y;
+    s8 i, j;
+    u8 xflip[32];
+    u8 h = sSpriteDimensions[shape][size][1];
+    u8 w = sSpriteDimensions[shape][size][0];
+
+    for (y = 0; y < h; y++)
+    {
+        int filler = 32 - w;
+
+        for (x = 0; x < w; x++)
+        {
+            int tile = (*tilemap & 0x3ff) * 32;
+            int attr = *tilemap & 0xc00;
+
+            if (attr == 0)
+            {
+                DmaCopy32Defvars(3, tiles + tile, output, 32);
+            }
+            else if (attr == 0x800)  // yflip
+            {
+                for (i = 0; i < 8; i++)
+                {
+                    DmaCopy32Defvars(3, (7 - i) * 4 + tile + tiles, output + i * 4, 4);
+                }
+            }
+            else  // xflip
+            {
+                for (i = 0; i < 8; i++)
+                {
+                    for (j = 0; j < 4; j++)
+                    {
+                        u8 i2 = i * 4;
+                        xflip[i2 + (3-j)] = (tiles[tile + i2 + j] & 0xf) << 4;
+                        xflip[i2 + (3-j)] |= tiles[tile + i2 + j] >> 4;
+                    }
+                }
+                if (*tilemap & 0x800)  // yflip
+                {
+                    for (i = 0; i < 8; i++)
+                    {
+                        DmaCopy32Defvars(3, (7 - i) * 4 + xflip, output + i * 4, 4);
+                    }
+                }
+                else
+                {
+                    DmaCopy32Defvars(3, xflip, output, 32);
+                }
+            }
+            tilemap++;
+            output += 32;
+        }
+        tilemap += filler;
+    }
+}
+#else
+NAKED
+void CopySpriteTiles(u8 shape, u8 size, u8 *tiles, u16 *tilemap, u8 *output)
+{
+    asm_unified("\tpush {r4-r7,lr}\n"
+                "\tmov r7, r10\n"
+                "\tmov r6, r9\n"
+                "\tmov r5, r8\n"
+                "\tpush {r5-r7}\n"
+                "\tsub sp, 0x3C\n"
+                "\tstr r2, [sp, 0x20]\n"
+                "\tadds r4, r3, 0\n"
+                "\tldr r7, [sp, 0x5C]\n"
+                "\tlsls r0, 24\n"
+                "\tlsls r1, 24\n"
+                "\tldr r2, _0804504C @ =sSpriteDimensions\n"
+                "\tlsrs r1, 23\n"
+                "\tlsrs r0, 21\n"
+                "\tadds r1, r0\n"
+                "\tadds r0, r2, 0x1\n"
+                "\tadds r0, r1, r0\n"
+                "\tldrb r0, [r0]\n"
+                "\tstr r0, [sp, 0x24]\n"
+                "\tadds r1, r2\n"
+                "\tldrb r1, [r1]\n"
+                "\tstr r1, [sp, 0x28]\n"
+                "\tmovs r1, 0\n"
+                "\tcmp r1, r0\n"
+                "\tbcc _08044FF8\n"
+                "\tb _0804517A\n"
+                "_08044FF8:\n"
+                "\tmovs r0, 0x20\n"
+                "\tldr r2, [sp, 0x28]\n"
+                "\tsubs r0, r2\n"
+                "\tlsls r0, 1\n"
+                "\tstr r0, [sp, 0x2C]\n"
+                "_08045002:\n"
+                "\tmovs r2, 0\n"
+                "\tadds r1, 0x1\n"
+                "\tstr r1, [sp, 0x34]\n"
+                "\tldr r3, [sp, 0x28]\n"
+                "\tcmp r2, r3\n"
+                "\tbcc _08045010\n"
+                "\tb _08045168\n"
+                "_08045010:\n"
+                "\tldr r0, _08045050 @ =0x040000d4\n"
+                "\tmov r8, r0\n"
+                "_08045014:\n"
+                "\tldrh r1, [r4]\n"
+                "\tldr r0, _08045054 @ =0x000003ff\n"
+                "\tands r0, r1\n"
+                "\tlsls r0, 5\n"
+                "\tmov r12, r0\n"
+                "\tmovs r0, 0xC0\n"
+                "\tlsls r0, 4\n"
+                "\tands r0, r1\n"
+                "\tmov r3, sp\n"
+                "\tstrh r1, [r3, 0x38]\n"
+                "\tcmp r0, 0\n"
+                "\tbne _0804505C\n"
+                "\tldr r0, [sp, 0x20]\n"
+                "\tadd r0, r12\n"
+                "\tmov r1, r8\n"
+                "\tstr r0, [r1]\n"
+                "\tstr r7, [r1, 0x4]\n"
+                "\tldr r3, _08045058 @ =0x84000008\n"
+                "\tstr r3, [r1, 0x8]\n"
+                "\tldr r0, [r1, 0x8]\n"
+                "\tadds r4, 0x2\n"
+                "\tstr r4, [sp, 0x30]\n"
+                "\tadds r7, 0x20\n"
+                "\tmov r10, r7\n"
+                "\tadds r2, 0x1\n"
+                "\tmov r9, r2\n"
+                "\tb _08045156\n"
+                "\t.align 2, 0\n"
+                "_0804504C: .4byte sSpriteDimensions\n"
+                "_08045050: .4byte 0x040000d4\n"
+                "_08045054: .4byte 0x000003ff\n"
+                "_08045058: .4byte 0x84000008\n"
+                "_0804505C:\n"
+                "\tmovs r1, 0x80\n"
+                "\tlsls r1, 4\n"
+                "\tcmp r0, r1\n"
+                "\tbne _080450AC\n"
+                "\tmovs r3, 0\n"
+                "\tadds r4, 0x2\n"
+                "\tstr r4, [sp, 0x30]\n"
+                "\tmovs r0, 0x20\n"
+                "\tadds r0, r7\n"
+                "\tmov r10, r0\n"
+                "\tadds r2, 0x1\n"
+                "\tmov r9, r2\n"
+                "\tldr r4, _080450A4 @ =0x040000d4\n"
+                "\tldr r6, _080450A8 @ =0x84000001\n"
+                "\tmovs r5, 0x7\n"
+                "_0804507A:\n"
+                "\tlsls r2, r3, 24\n"
+                "\tasrs r2, 24\n"
+                "\tsubs r0, r5, r2\n"
+                "\tlsls r0, 2\n"
+                "\tadd r0, r12\n"
+                "\tldr r1, [sp, 0x20]\n"
+                "\tadds r0, r1, r0\n"
+                "\tlsls r1, r2, 2\n"
+                "\tadds r1, r7, r1\n"
+                "\tstr r0, [r4]\n"
+                "\tstr r1, [r4, 0x4]\n"
+                "\tstr r6, [r4, 0x8]\n"
+                "\tldr r0, [r4, 0x8]\n"
+                "\tadds r2, 0x1\n"
+                "\tlsls r2, 24\n"
+                "\tlsrs r3, r2, 24\n"
+                "\tasrs r2, 24\n"
+                "\tcmp r2, 0x7\n"
+                "\tble _0804507A\n"
+                "\tb _08045156\n"
+                "\t.align 2, 0\n"
+                "_080450A4: .4byte 0x040000d4\n"
+                "_080450A8: .4byte 0x84000001\n"
+                "_080450AC:\n"
+                "\tmovs r3, 0\n"
+                "\tadds r4, 0x2\n"
+                "\tstr r4, [sp, 0x30]\n"
+                "\tmovs r0, 0x20\n"
+                "\tadds r0, r7\n"
+                "\tmov r10, r0\n"
+                "\tadds r2, 0x1\n"
+                "\tmov r9, r2\n"
+                "_080450BC:\n"
+                "\tmovs r2, 0\n"
+                "\tlsls r4, r3, 24\n"
+                "\tlsls r0, r4, 2\n"
+                "\tlsrs r0, 24\n"
+                "\tadds r6, r0, 0x3\n"
+                "\tmov r1, r12\n"
+                "\tadds r5, r1, r0\n"
+                "_080450CA:\n"
+                "\tlsls r1, r2, 24\n"
+                "\tasrs r1, 24\n"
+                "\tsubs r0, r6, r1\n"
+                "\tmov r2, sp\n"
+                "\tadds r3, r2, r0\n"
+                "\tadds r0, r5, r1\n"
+                "\tldr r2, [sp, 0x20]\n"
+                "\tadds r0, r2, r0\n"
+                "\tldrb r2, [r0]\n"
+                "\tmovs r0, 0xF\n"
+                "\tands r0, r2\n"
+                "\tlsls r0, 4\n"
+                "\tlsrs r2, 4\n"
+                "\torrs r0, r2\n"
+                "\tstrb r0, [r3]\n"
+                "\tadds r1, 0x1\n"
+                "\tlsls r1, 24\n"
+                "\tlsrs r2, r1, 24\n"
+                "\tasrs r1, 24\n"
+                "\tcmp r1, 0x3\n"
+                "\tble _080450CA\n"
+                "\tmovs r3, 0x80\n"
+                "\tlsls r3, 17\n"
+                "\tadds r0, r4, r3\n"
+                "\tlsrs r3, r0, 24\n"
+                "\tasrs r0, 24\n"
+                "\tcmp r0, 0x7\n"
+                "\tble _080450BC\n"
+                "\tmovs r0, 0x80\n"
+                "\tlsls r0, 4\n"
+                "\tmov r1, sp\n"
+                "\tldrh r1, [r1, 0x38]\n"
+                "\tands r0, r1\n"
+                "\tcmp r0, 0\n"
+                "\tbeq _08045148\n"
+                "\tmovs r3, 0\n"
+                "\tldr r4, _08045140 @ =0x040000d4\n"
+                "\tldr r6, _08045144 @ =0x84000001\n"
+                "\tmovs r5, 0x7\n"
+                "_08045118:\n"
+                "\tlsls r1, r3, 24\n"
+                "\tasrs r1, 24\n"
+                "\tsubs r0, r5, r1\n"
+                "\tlsls r0, 2\n"
+                "\tmov r3, sp\n"
+                "\tadds r2, r3, r0\n"
+                "\tlsls r0, r1, 2\n"
+                "\tadds r0, r7, r0\n"
+                "\tstr r2, [r4]\n"
+                "\tstr r0, [r4, 0x4]\n"
+                "\tstr r6, [r4, 0x8]\n"
+                "\tldr r0, [r4, 0x8]\n"
+                "\tadds r1, 0x1\n"
+                "\tlsls r1, 24\n"
+                "\tlsrs r3, r1, 24\n"
+                "\tasrs r1, 24\n"
+                "\tcmp r1, 0x7\n"
+                "\tble _08045118\n"
+                "\tb _08045156\n"
+                "\t.align 2, 0\n"
+                "_08045140: .4byte 0x040000d4\n"
+                "_08045144: .4byte 0x84000001\n"
+                "_08045148:\n"
+                "\tmov r0, sp\n"
+                "\tmov r1, r8\n"
+                "\tstr r0, [r1]\n"
+                "\tstr r7, [r1, 0x4]\n"
+                "\tldr r2, _0804518C @ =0x84000008\n"
+                "\tstr r2, [r1, 0x8]\n"
+                "\tldr r0, [r1, 0x8]\n"
+                "_08045156:\n"
+                "\tldr r4, [sp, 0x30]\n"
+                "\tmov r7, r10\n"
+                "\tmov r3, r9\n"
+                "\tlsls r0, r3, 24\n"
+                "\tlsrs r2, r0, 24\n"
+                "\tldr r0, [sp, 0x28]\n"
+                "\tcmp r2, r0\n"
+                "\tbcs _08045168\n"
+                "\tb _08045014\n"
+                "_08045168:\n"
+                "\tldr r1, [sp, 0x2C]\n"
+                "\tadds r4, r1\n"
+                "\tldr r2, [sp, 0x34]\n"
+                "\tlsls r0, r2, 24\n"
+                "\tlsrs r1, r0, 24\n"
+                "\tldr r3, [sp, 0x24]\n"
+                "\tcmp r1, r3\n"
+                "\tbcs _0804517A\n"
+                "\tb _08045002\n"
+                "_0804517A:\n"
+                "\tadd sp, 0x3C\n"
+                "\tpop {r3-r5}\n"
+                "\tmov r8, r3\n"
+                "\tmov r9, r4\n"
+                "\tmov r10, r5\n"
+                "\tpop {r4-r7}\n"
+                "\tpop {r0}\n"
+                "\tbx r0\n"
+                "\t.align 2, 0\n"
+                "_0804518C: .4byte 0x84000008");
+}
+#endif // NONMATCHING
+
+int CountTrailingZeroBits(u32 value)
+{
+    u8 i;
+
+    for (i = 0; i < 32; i++)
+    {
+        if ((value & 1) == 0)
+            value >>= 1;
+        else
+            return i;
+    }
+    return 0;
+}
+
+u16 CalcCRC16(const u8 *data, u32 length)
+{
+    u16 i, j;
+    u16 crc = 0x1121;
+
+    for (i = 0; i < length; i++)
+    {
+        crc ^= data[i];
+        for (j = 0; j < 8; j++)
+        {
+            if (crc & 1)
+                crc = (crc >> 1) ^ 0x8408;
+            else
+                crc >>= 1;
+        }
+    }
+    return ~crc;
+}
+
+u16 CalcCRC16WithTable(const u8 *data, u32 length)
+{
+    u16 i;
+    u16 crc = 0x1121;
+    u8 byte;
+
+    for (i = 0; i < length; i++)
+    {
+        byte = crc >> 8;
+        crc ^= data[i];
+        crc = byte ^ gCrc16Table[(u8)crc];
+    }
+    return ~crc;
+}
+
+u32 CalcByteArraySum(const u8 * array, u32 size)
+{
+    s32 i;
+    u32 result = 0;
+
+    for (i = 0; i < size; i++)
+    {
+        result += array[i];
+    }
+
+    return result;
+}