1 files changed, 256 insertions, 0 deletions
diff --git a/arm9/asm/MATH_crc.s b/arm9/asm/MATH_crc.s
new file mode 100644
index 00000000..2b9b8f26
--- /dev/null
+++ b/arm9/asm/MATH_crc.s
@@ -0,0 +1,256 @@
+	.include "asm/macros.inc"
+	.include "global.inc"
+
+	.text
+
+	arm_func_start MATH_CalcCRC32
+MATH_CalcCRC32: ; 0x020DDD28
+	stmdb sp!, {lr}
+	sub sp, sp, #0x4
+	mov lr, r1
+	mvn r12, #0x0
+	mov r3, r2
+	add r1, sp, #0x0
+	mov r2, lr
+	str r12, [sp, #0x0]
+	bl MATHi_CRC32UpdateRev
+_020DDD4C: ; 0x020DDD4C
+	ldr r0, [sp, #0x0]
+	mvn r0, r0
+	add sp, sp, #0x4
+	ldmia sp!, {lr}
+	bx lr
+
+	arm_func_start MATH_CalcCRC16CCITT
+MATH_CalcCRC16CCITT: ; 0x020DDD60
+	stmdb sp!, {lr}
+	sub sp, sp, #0x4
+	ldr ip, _020DDD94 ; =0x0000FFFF
+	mov lr, r1
+	mov r3, r2
+	add r1, sp, #0x0
+	mov r2, lr
+	strh r12, [sp, #0x0]
+	bl MATHi_CRC16Update
+	ldrh r0, [sp, #0x0]
+	add sp, sp, #0x4
+	ldmia sp!, {lr}
+	bx lr
+	.balign 4
+_020DDD94: .word 0x0000FFFF
+
+	arm_func_start MATH_CalcCRC16
+MATH_CalcCRC16: ; 0x020DDD98
+	stmdb sp!, {lr}
+	sub sp, sp, #0x4
+	mov lr, r1
+	mov r12, #0x0
+	mov r3, r2
+	add r1, sp, #0x0
+	mov r2, lr
+	strh r12, [sp, #0x0]
+	bl MATHi_CRC16UpdateRev
+	ldrh r0, [sp, #0x0]
+	add sp, sp, #0x4
+	ldmia sp!, {lr}
+	bx lr
+
+	arm_func_start MATH_CalcCRC8
+MATH_CalcCRC8: ; 0x020DDDCC
+	stmdb sp!, {lr}
+	sub sp, sp, #0x4
+	mov lr, r1
+	mov r12, #0x0
+	mov r3, r2
+	add r1, sp, #0x0
+	mov r2, lr
+	strb r12, [sp, #0x0]
+	bl MATHi_CRC8Update
+_020DDDF0: ; 0x020DDDF0
+	ldrb r0, [sp, #0x0]
+	add sp, sp, #0x4
+	ldmia sp!, {lr}
+	bx lr
+
+	arm_func_start MATHi_CRC32UpdateRev
+MATHi_CRC32UpdateRev:
+	stmdb sp!, {r4,lr}
+	cmp r3, #0x0
+	ldr r4, [r1, #0x0]
+	mov lr, #0x0
+	bls _020DDE38
+_020DDE14:
+	ldrb r12, [r2, #0x0]
+	add lr, lr, #0x1
+	cmp lr, r3
+	eor r12, r4, r12
+	and r12, r12, #0xff
+	ldr r12, [r0, r12, lsl #0x2]
+	add r2, r2, #0x1
+	eor r4, r12, r4, lsr #0x8
+	blo _020DDE14
+_020DDE38:
+	str r4, [r1, #0x0]
+	ldmia sp!, {r4,lr}
+	bx lr
+
+	arm_func_start MATHi_CRC32InitTableRev
+MATHi_CRC32InitTableRev: ; 0x020DDE44
+	stmdb sp!, {r4,lr}
+	mov lr, #0x0
+	mov r3, lr
+_020DDE50:
+	mov r4, lr
+	mov r12, r3
+_020DDE58:
+	ands r2, r4, #0x1
+	eorne r4, r1, r4, lsr #0x1
+	add r12, r12, #0x1
+	moveq r4, r4, lsr #0x1
+	cmp r12, #0x8
+	blo _020DDE58
+	str r4, [r0, lr, lsl #0x2]
+	add lr, lr, #0x1
+	cmp lr, #0x100
+	blo _020DDE50
+	ldmia sp!, {r4,lr}
+	bx lr
+
+	arm_func_start MATHi_CRC16UpdateRev
+MATHi_CRC16UpdateRev: ; 0x020DDE88
+	stmdb sp!, {r4,lr}
+	cmp r3, #0x0
+	ldrh r4, [r1, #0x0]
+	mov lr, #0x0
+	bls _020DDEC4
+_020DDE9C:
+	ldrb r12, [r2, #0x0]
+	add lr, lr, #0x1
+	cmp lr, r3
+	eor r12, r4, r12
+	and r12, r12, #0xff
+	mov r12, r12, lsl #0x1
+	ldrh r12, [r0, r12]
+	add r2, r2, #0x1
+	eor r4, r12, r4, lsr #0x8
+	blo _020DDE9C
+_020DDEC4:
+	strh r4, [r1, #0x0]
+	ldmia sp!, {r4,lr}
+	bx lr
+
+	arm_func_start MATHi_CRC16Update
+MATHi_CRC16Update: ; 0x020DDED0
+	stmdb sp!, {r4,lr}
+	cmp r3, #0x0
+	ldrh r4, [r1, #0x0]
+	mov lr, #0x0
+	bls _020DDF0C
+_020DDEE4:
+	ldrb r12, [r2, #0x0]
+	add lr, lr, #0x1
+	cmp lr, r3
+	eor r12, r12, r4, lsr #0x8
+	and r12, r12, #0xff
+	mov r12, r12, lsl #0x1
+	ldrh r12, [r0, r12]
+	add r2, r2, #0x1
+	eor r4, r12, r4, lsl #0x8
+	blo _020DDEE4
+_020DDF0C:
+	strh r4, [r1, #0x0]
+	ldmia sp!, {r4,lr}
+	bx lr
+
+	arm_func_start MATHi_CRC16InitTableRev
+MATHi_CRC16InitTableRev: ; 0x020DDF18
+	stmdb sp!, {r4,lr}
+	mov lr, #0x0
+	mov r3, lr
+_020DDF24:
+	mov r4, lr
+	mov r12, r3
+_020DDF2C:
+	ands r2, r4, #0x1
+	eorne r4, r1, r4, lsr #0x1
+	add r12, r12, #0x1
+	moveq r4, r4, lsr #0x1
+	cmp r12, #0x8
+	blo _020DDF2C
+	mov r2, lr, lsl #0x1
+	add lr, lr, #0x1
+	strh r4, [r0, r2]
+	cmp lr, #0x100
+	blo _020DDF24
+	ldmia sp!, {r4,lr}
+	bx lr
+
+	arm_func_start MATHi_CRC16InitTable
+MATHi_CRC16InitTable: ; 0x020DDF60
+	stmdb sp!, {r4-r5,lr}
+	sub sp, sp, #0x4
+	mov r4, #0x0
+	mov r12, r4
+	mov r3, r4
+_020DDF74:
+	mov r5, r12
+	mov lr, r3
+_020DDF7C:
+	ands r2, r5, #0x8000
+	eorne r5, r1, r5, lsl #0x1
+	add lr, lr, #0x1
+	moveq r5, r5, lsl #0x1
+	cmp lr, #0x8
+	blo _020DDF7C
+	mov r2, r4, lsl #0x1
+	add r4, r4, #0x1
+	strh r5, [r0, r2]
+	cmp r4, #0x100
+	add r12, r12, #0x100
+	blo _020DDF74
+	add sp, sp, #0x4
+	ldmia sp!, {r4-r5,lr}
+	bx lr
+
+	arm_func_start MATHi_CRC8Update
+MATHi_CRC8Update:
+	stmdb sp!, {r4,lr}
+	cmp r3, #0x0
+	ldrb r4, [r1, #0x0]
+	mov lr, #0x0
+	bls _020DDFEC
+_020DDFCC:
+	ldrb r12, [r2, #0x0]
+	add lr, lr, #0x1
+	cmp lr, r3
+	eor r12, r4, r12
+	and r12, r12, #0xff
+	add r2, r2, #0x1
+	ldrb r4, [r0, r12]
+	blo _020DDFCC
+_020DDFEC:
+	strb r4, [r1, #0x0]
+	ldmia sp!, {r4,lr}
+	bx lr
+
+	arm_func_start MATHi_CRC8InitTable
+MATHi_CRC8InitTable: ; 0x020DDFF8
+	stmdb sp!, {r4,lr}
+	mov lr, #0x0
+	mov r3, lr
+_020DE004:
+	mov r4, lr
+	mov r12, r3
+_020DE00C:
+	ands r2, r4, #0x80
+	eorne r4, r1, r4, lsl #0x1
+	add r12, r12, #0x1
+	moveq r4, r4, lsl #0x1
+	cmp r12, #0x8
+	blo _020DE00C
+	strb r4, [r0, lr]
+	add lr, lr, #0x1
+	cmp lr, #0x100
+	blo _020DE004
+	ldmia sp!, {r4,lr}
+	bx lr