arm9 MI_uncompress

1 files changed, 59 insertions, 0 deletions

diff --git a/arm9/lib/src/MI_uncompress.c b/arm9/lib/src/MI_uncompress.c
new file mode 100644
index 00000000..c6ad7e4e
--- /dev/null
+++ b/arm9/lib/src/MI_uncompress.c
@@ -0,0 +1,59 @@
+#include "function_target.h"
+#include "MI_uncompress.h"
+
+ARM_FUNC asm void MI_UncompressLZ8(register const void *srcp, register void *destp)
+{
+    stmfd sp!, {r4-r6, lr}
+
+    ldr r5, [r0], #4
+    mov r2, r5, lsr #8
+
+_020CE534:
+    cmp r2, #0
+    ble _020CE5B4
+
+    ldrb lr, [r0], #1
+    mov r4, #8
+
+_020CE544:
+    subs r4, r4, #1
+    blt _020CE534
+
+    tst lr, #0x80
+    bne _020CE568
+
+    ldrb r6, [r0], #1
+    swpb r6, r6, [r1]
+    add r1, r1, #1
+    sub r2, r2, #1
+    b _020CE5A4
+
+_020CE568:
+    ldrb r5, [r0, #0]
+    mov r6, #3
+    add r3, r6, r5, asr #4
+    ldrb r6, [r0], #1
+    and r5, r6, #0xf
+    mov r12, r5, lsl #8
+    ldrb r6, [r0], #1
+    orr r5, r6, r12
+    add r12, r5, #1
+    sub r2, r2, r3
+
+_020CE590:
+    ldrb r5, [r1, -r12]
+    swpb r5, r5, [r1]
+    add r1, r1, #1
+    subs r3, r3, #1
+    bgt _020CE590
+
+_020CE5A4:
+    cmp r2, #0
+    movgt lr, lr, lsl #1
+    bgt _020CE544
+    b _020CE534
+
+_020CE5B4:
+    ldmfd sp!, {r4-r6, lr}
+    bx lr
+}