Function at 0x508520
Capabilities:
Encode data using xor

Disassembly:
push ebp
mov ebp, esp
push ebx
push esi
push edi
mov esi, dword [ebp + 8]
add esi, 0xffffef02
xor edi, edi
xor ebx, ebx
mov eax, dword [ebp + 8]
mov word [eax - 0x1a6e], 2
mov eax, dword [ebp + 8]
cmp word [eax - 0x1a5a], 0
je 0x508808
mov eax, dword [ebp + 8]
cmp word [eax - 0x1a5a], 3
jb 0x50860a
movzx eax, word [esi]
add eax, 3
mov edx, dword [ebp + 8]
mov edx, dword [edx - 0x40c]
mov edx, dword [edx + 0xb74]
movzx eax, byte [edx + eax - 1]
mov edx, dword [ebp + 8]
mov dx, word [edx - 0x1a6c]
shl edx, 5
xor ax, dx
and ax, 0x7fff
mov edx, dword [ebp + 8]
mov word [edx - 0x1a6c], ax
mov eax, dword [ebp + 8]
movzx eax, word [eax - 0x1a6c]
mov edx, dword [ebp + 8]
mov edx, dword [edx - 0x40c]
mov edx, dword [edx + 0xb7c]
mov ax, word [edx + eax*2]
mov dx, word [esi]
and dx, 0x7fff
movzx edx, dx
mov ecx, dword [ebp + 8]
mov ecx, dword [ecx - 0x40c]
mov ecx, dword [ecx + 0xb78]
mov word [ecx + edx*2], ax
mov eax, dword [ebp + 8]
movzx eax, word [eax - 0x1a6c]
mov edx, dword [ebp + 8]
mov edx, dword [edx - 0x40c]
mov edx, dword [edx + 0xb7c]
mov di, word [edx + eax*2]
mov edx, dword [ebp + 8]
mov edx, dword [ebp + 8]
mov edx, dword [edx - 0x40c]
mov edx, dword [edx + 0xb7c]
mov cx, word [esi]
mov word [edx + eax*2], cx
test di, di
je 0x508642
movzx eax, word [esi]
movzx edx, di
sub eax, edx
cmp eax, 0x7efa
jg 0x508642
mov eax, dword [ebp + 8]
push eax
mov eax, edi
call fcn.0050813c
pop ecx
mov ebx, eax
mov eax, dword [ebp + 8]
cmp bx, word [eax - 0x1a5a]
jbe 0x508642
mov eax, dword [ebp + 8]
mov bx, word [eax - 0x1a5a]
cmp bx, 3
jb 0x508794
mov eax, dword [ebp + 8]
push eax
movzx eax, word [esi]
mov edx, dword [ebp + 8]
movzx edx, word [edx - 0x1a5e]
sub eax, edx
movzx edx, bx
sub edx, 3
call fcn.00506cf0
pop ecx
mov edx, dword [ebp + 8]
sub word [edx - 0x1a5a], bx
mov edx, dword [ebp + 8]
cmp bx, word [edx - 0x1a62]
ja 0x508737
dec ebx
inc word [esi]
movzx edx, word [esi]
add edx, 3
mov ecx, dword [ebp + 8]
mov ecx, dword [ecx - 0x40c]
mov ecx, dword [ecx + 0xb74]
movzx edx, byte [ecx + edx - 1]
mov ecx, dword [ebp + 8]
mov cx, word [ecx - 0x1a6c]
shl ecx, 5
xor dx, cx
and dx, 0x7fff
mov ecx, dword [ebp + 8]
mov word [ecx - 0x1a6c], dx
mov edx, dword [ebp + 8]
movzx edx, word [edx - 0x1a6c]
mov ecx, dword [ebp + 8]
mov ecx, dword [ecx - 0x40c]
mov ecx, dword [ecx + 0xb7c]
mov dx, word [ecx + edx*2]
push edx
mov dx, word [esi]
and dx, 0x7fff
movzx edx, dx
mov ecx, dword [ebp + 8]
mov ecx, dword [ecx - 0x40c]
mov ecx, dword [ecx + 0xb78]
lea ecx, [ecx + edx*2]
pop edx
mov word [ecx], dx
mov edx, dword [ebp + 8]
movzx edx, word [edx - 0x1a6c]
mov ecx, dword [ebp + 8]
mov ecx, dword [ecx - 0x40c]
mov ecx, dword [ecx + 0xb7c]
lea edx, [ecx + edx*2]
push edx
mov dx, word [esi]
pop ecx
mov word [ecx], dx
dec ebx
test bx, bx
jne 0x508686
inc word [esi]
jmp 0x5087c3
add word [esi], bx
xor ebx, ebx
movzx edx, word [esi]
mov ecx, dword [ebp + 8]
mov ecx, dword [ecx - 0x40c]
mov ecx, dword [ecx + 0xb74]
movzx edx, byte [ecx + edx]
mov ecx, dword [ebp + 8]
mov word [ecx - 0x1a6c], dx
movzx edx, word [esi]
mov ecx, dword [ebp + 8]
mov ecx, dword [ecx - 0x40c]
mov ecx, dword [ecx + 0xb74]
movzx edx, byte [ecx + edx + 1]
mov ecx, dword [ebp + 8]
mov cx, word [ecx - 0x1a6c]
shl ecx, 5
xor dx, cx
and dx, 0x7fff
mov ecx, dword [ebp + 8]
mov word [ecx - 0x1a6c], dx
jmp 0x5087c3
mov eax, dword [ebp + 8]
push eax
movzx eax, word [esi]
mov edx, dword [ebp + 8]
mov edx, dword [edx - 0x40c]
mov edx, dword [edx + 0xb74]
movzx edx, byte [edx + eax]
xor eax, eax
call fcn.00506cf0
pop ecx
mov edx, dword [ebp + 8]
dec word [edx - 0x1a5a]
inc word [esi]
test al, al
je 0x5087df
mov eax, dword [ebp + 8]
push eax
xor eax, eax
call fcn.005083e4
pop ecx
movzx eax, word [esi]
mov edx, dword [ebp + 8]
mov dword [edx - 0x1104], eax
mov eax, dword [ebp + 8]
cmp word [eax - 0x1a5a], 0x106
jae 0x5087f7
mov eax, dword [ebp + 8]
push eax
call fcn.00507d94
pop ecx
mov eax, dword [ebp + 8]
cmp word [eax - 0x1a5a], 0
jne 0x508550
mov eax, dword [ebp + 8]
push eax
mov eax, 1
call fcn.005083e4
pop ecx
pop edi
pop esi
pop ebx
pop ebp
ret