Function at 0x4d8580
Capabilities:
Create thread
Resume thread

Disassembly:
mov eax, dword [esp + 8]
sub esp, 8
cmp eax, 0x24
push ebx
push ebp
push esi
push edi
jl 0x4d869d
mov edi, str.RIFF
or ecx, 0xffffffff
xor eax, eax
mov esi, dword [esp + 0x1c]
repne scasb al, byte es:[edi]
not ecx
dec ecx
push ecx
push str.RIFF
push esi
call fcn.0056e6d0
add esp, 0xc
test eax, eax
jne 0x4d869d
mov eax, dword [esi + 4]
mov edi, 0xbb82c4
mov dword [esp + 0x14], eax
or ecx, 0xffffffff
xor eax, eax
add esi, 8
repne scasb al, byte es:[edi]
not ecx
dec ecx
push ecx
push 0xbb82c4
push esi
call fcn.0056e6d0
add esp, 0xc
test eax, eax
jne 0x4d869d
mov ecx, dword [esp + 0x1c]
xor ebx, ebx
xor esi, esi
xor ebp, ebp
lea edi, [ecx + 0xc]
mov dword [esp + 0x10], edi
mov edx, dword [edi + 4]
push 4
push str.fmt
push edi
mov dword [esp + 0x28], edx
call fcn.0056e6d0
add esp, 0xc
test eax, eax
jne 0x4d8623
test esi, esi
lea ebx, [edi + 8]
jne 0x4d865a
jmp 0x4d8642
push 4
push 0xbb82b4
push edi
call fcn.0056e6d0
add esp, 0xc
test eax, eax
jne 0x4d8642
mov ebp, dword [esp + 0x1c]
lea esi, [edi + 8]
test ebx, ebx
jne 0x4d865e
mov eax, dword [esp + 0x1c]
mov edx, dword [esp + 0x10]
lea edi, [edi + eax + 8]
mov eax, dword [esp + 0x14]
mov ecx, edi
sub ecx, edx
cmp ecx, eax
jb 0x4d85ff
test ebx, ebx
je 0x4d869d
test esi, esi
je 0x4d869d
test ebp, ebp
jbe 0x4d869d
push 0x4c
call fcn.0059740b
mov dword [esp + 0x24], eax
mov dword [eax + 8], ebp
mov edx, dword [esp + 0x24]
mov eax, dword [edx + 8]
push eax
call fcn.0056fc17
mov ecx, dword [esp + 0x28]
add esp, 8
mov dword [ecx], eax
mov eax, dword [esp + 0x20]
mov edi, dword [eax]
test edi, edi
jne 0x4d86a7
push eax
call fcn.00597434
add esp, 4
pop edi
pop esi
pop ebp
xor eax, eax
pop ebx
add esp, 8
ret
mov ecx, ebp
push 0x14
mov edx, ecx
push 0x3c00
shr ecx, 2
rep movsd dword es:[edi], dword [esi]
mov ecx, edx
and ecx, 3
rep movsb byte es:[edi], byte [esi]
mov eax, dword [esp + 0x28]
mov ecx, dword [esp + 0x2c]
mov dword [eax + 0x48], ecx
mov edx, dword [esp + 0x28]
mov dword [edx + 0x1c], 0
call fcn.004d8370
mov ecx, dword [esp + 0x28]
add esp, 8
push 0
push 0
push 1
push 0
mov dword [ecx + 0xc], eax
call dword [sym.imp.kernel32.dll_CreateEventA]
mov edx, dword [esp + 0x20]
push 0
push 0x14
push 0x14
push 0
mov dword [edx + 0x2c], eax
call dword [sym.imp.kernel32.dll_CreateSemaphoreA]
mov ecx, dword [esp + 0x20]
mov dword [ecx + 0x28], eax
mov edx, dword [esp + 0x20]
mov dword [edx + 0x14], 0
mov eax, dword [esp + 0x20]
mov dword [eax + 0x10], 0x14
mov ecx, dword [esp + 0x20]
add ecx, 0x30
push ecx
call dword [sym.imp.kernel32.dll_InitializeCriticalSection]
mov eax, dword [esp + 0x20]
push 0x4d8bb0
push eax
add eax, 4
push ebx
push eax
call fcn.004d83e0
mov eax, dword [esp + 0x30]
add esp, 0x10
mov edi, 4
lea edx, [eax + 0x24]
push edx
push edi
push eax
push 0x4d8960
push 0
push 0
call dword [sym.imp.kernel32.dll_CreateThread]
mov ecx, dword [esp + 0x20]
push 0xbecf38
mov dword [ecx + 0x20], eax
call dword [sym.imp.kernel32.dll_EnterCriticalSection]
mov eax, dword [0xbecf58]
mov edx, dword [0xbecf5c]
sub edx, eax
mov esi, eax
sar edx, 2
cmp edx, 1
jae 0x4d8883
mov edx, dword [0xbecf54]
test edx, edx
je 0x4d87b2
mov ecx, eax
sub ecx, edx
sar ecx, 2
cmp ecx, 1
jbe 0x4d87b2
mov ecx, eax
sub ecx, edx
sar ecx, 2
jmp 0x4d87b7
mov ecx, 1
test edx, edx
jne 0x4d87bf
xor eax, eax
jmp 0x4d87c4
sub eax, edx
sar eax, 2
add eax, ecx
test eax, eax
mov dword [esp + 0x1c], eax
jge 0x4d87d0
xor eax, eax
lea edx, [eax*4]
push edx
call fcn.0059740b
mov edi, dword [0xbecf54]
add esp, 4
mov ebp, eax
cmp edi, esi
mov ebx, ebp
je 0x4d8802
push edi
push ebx
call fcn.005308f0
add edi, 4
add esp, 8
add ebx, 4
cmp edi, esi
jne 0x4d87ee
lea eax, [esp + 0x20]
push eax
push ebx
call fcn.005308f0
mov edi, dword [0xbecf58]
add esp, 8
add ebx, 4
cmp esi, edi
je 0x4d8831
push esi
push ebx
call fcn.005308f0
add esi, 4
add esp, 8
add ebx, 4
cmp esi, edi
jne 0x4d881d
mov ecx, dword [0xbecf58]
mov edx, dword [0xbecf54]
push ecx
push edx
mov ecx, 0xbecf50
call fcn.0053e050
mov eax, dword [0xbecf54]
push eax
call fcn.00597434
mov ecx, dword [esp + 0x20]
add esp, 4
lea edx, [ebp + ecx*4]
mov ecx, 0xbecf50
mov dword [0xbecf5c], edx
call fcn.0053e030
lea eax, [ebp + eax*4 + 4]
mov dword [0xbecf54], ebp
mov dword [0xbecf58], eax
jmp 0x4d8920
mov ecx, eax
sub ecx, esi
sar ecx, 2
cmp ecx, 1
jae 0x4d88dd
lea edx, [esi + 4]
mov ecx, 0xbecf50
push edx
push eax
push esi
call fcn.004d8bf0
lea eax, [esp + 0x20]
mov edx, 1
push eax
mov eax, dword [0xbecf58]
mov ecx, eax
sub ecx, esi
sar ecx, 2
sub edx, ecx
mov ecx, 0xbecf50
push edx
push eax
call fcn.004d8c20
mov ecx, dword [0xbecf58]
mov eax, esi
cmp esi, ecx
je 0x4d891a
mov edx, dword [esp + 0x20]
mov dword [eax], edx
add eax, edi
cmp eax, ecx
jne 0x4d88cf
jmp 0x4d891a
push eax
push eax
add eax, 0xfffffffc
mov ecx, 0xbecf50
push eax
call fcn.004d8bf0
mov eax, dword [0xbecf58]
mov ecx, eax
add eax, 0xfffffffc
cmp esi, eax
je 0x4d8907
sub eax, edi
sub ecx, edi
cmp eax, esi
mov edx, dword [eax]
mov dword [ecx], edx
jne 0x4d88fb
lea eax, [esi + 4]
cmp esi, eax
je 0x4d891a
mov ecx, dword [esp + 0x20]
mov dword [esi], ecx
add esi, edi
cmp esi, eax
jne 0x4d890e
add dword [0xbecf58], edi
push 0xbecf38
call dword [sym.imp.kernel32.dll_LeaveCriticalSection]
mov edx, dword [esp + 0x20]
mov eax, dword [edx + 0x20]
push eax
call dword [sym.imp.kernel32.dll_ResumeThread]
mov ecx, dword [esp + 0x20]
push 0
push 0x14
mov edx, dword [ecx + 0x28]
push edx
call dword [sym.imp.kernel32.dll_ReleaseSemaphore]
pop edi
pop esi
pop ebp
mov eax, 1
pop ebx
add esp, 8
ret