Function at 0x4f7870
Capabilities:
Encrypt data using rc4 prga

Disassembly:
push ebp
mov ebp, esp
sub esp, 0x1c
mov eax, dword [ebp + 8]
mov ecx, dword [eax + 8]
and ecx, 7
je 0x4f78da
mov edx, dword [ebp + 8]
mov eax, dword [edx + 8]
and eax, 7
mov dword [ebp - 0x14], eax
mov ecx, dword [ebp + 8]
mov edx, dword [ecx + 8]
cmp edx, dword [ebp - 0x14]
jge 0x4f78a4
mov eax, dword [ebp + 8]
push eax
call fcn.004ed880
add esp, 4
mov edx, 1
mov ecx, dword [ebp - 0x14]
shl edx, cl
sub edx, 1
mov eax, dword [ebp + 8]
and edx, dword [eax + 0xc]
mov dword [ebp - 0x1c], edx
mov ecx, dword [ebp + 8]
mov edx, dword [ecx + 0xc]
mov ecx, dword [ebp - 0x14]
shr edx, cl
mov eax, dword [ebp + 8]
mov dword [eax + 0xc], edx
mov ecx, dword [ebp + 8]
mov edx, dword [ecx + 8]
sub edx, dword [ebp - 0x14]
mov eax, dword [ebp + 8]
mov dword [eax + 8], edx
mov dword [ebp - 8], 0
mov ecx, dword [ebp + 8]
cmp dword [ecx + 8], 0
jle 0x4f7925
mov edx, dword [ebp + 8]
mov eax, dword [edx + 0xc]
and eax, 0xff
mov ecx, dword [ebp - 8]
mov byte [ebp + ecx - 0x10], al
mov edx, dword [ebp - 8]
add edx, 1
mov dword [ebp - 8], edx
mov eax, dword [ebp + 8]
mov ecx, dword [eax + 0xc]
shr ecx, 8
mov edx, dword [ebp + 8]
mov dword [edx + 0xc], ecx
mov eax, dword [ebp + 8]
mov ecx, dword [eax + 8]
sub ecx, 8
mov edx, dword [ebp + 8]
mov dword [edx + 8], ecx
jmp 0x4f78e1
cmp dword [ebp - 8], 4
jge 0x4f7970
mov eax, dword [ebp + 8]
mov ecx, dword [ebp + 8]
mov edx, dword [eax]
cmp edx, dword [ecx + 4]
jb 0x4f793e
mov byte [ebp - 1], 0
jmp 0x4f795b
mov eax, dword [ebp + 8]
mov ecx, dword [eax]
mov dl, byte [ecx]
mov byte [ebp - 2], dl
mov eax, dword [ebp + 8]
mov ecx, dword [eax]
add ecx, 1
mov edx, dword [ebp + 8]
mov dword [edx], ecx
mov al, byte [ebp - 2]
mov byte [ebp - 1], al
mov ecx, dword [ebp - 8]
mov dl, byte [ebp - 1]
mov byte [ebp + ecx - 0x10], dl
mov eax, dword [ebp - 8]
add eax, 1
mov dword [ebp - 8], eax
jmp 0x4f7925
mov ecx, 1
shl ecx, 0
movzx edx, byte [ebp + ecx - 0x10]
shl edx, 8
mov eax, 1
imul ecx, eax, 0
movzx eax, byte [ebp + ecx - 0x10]
add edx, eax
mov dword [ebp - 0xc], edx
mov ecx, 1
imul edx, ecx, 3
movzx eax, byte [ebp + edx - 0x10]
shl eax, 8
mov ecx, 1
shl ecx, 1
movzx edx, byte [ebp + ecx - 0x10]
add eax, edx
mov dword [ebp - 0x18], eax
mov eax, dword [ebp - 0xc]
xor eax, 0xffff
cmp dword [ebp - 0x18], eax
je 0x4f79d2
push str.zlib_corrupt
call fcn.004ed6e0
add esp, 4
jmp 0x4f7a5b
mov ecx, dword [ebp + 8]
mov edx, dword [ecx]
add edx, dword [ebp - 0xc]
mov eax, dword [ebp + 8]
cmp edx, dword [eax + 4]
jbe 0x4f79f1
push str.read_past_buffer
call fcn.004ed6e0
add esp, 4
jmp 0x4f7a5b
mov ecx, dword [ebp + 8]
mov edx, dword [ecx + 0x10]
add edx, dword [ebp - 0xc]
mov eax, dword [ebp + 8]
cmp edx, dword [eax + 0x18]
jbe 0x4f7a21
mov ecx, dword [ebp - 0xc]
push ecx
mov edx, dword [ebp + 8]
mov eax, dword [edx + 0x10]
push eax
mov ecx, dword [ebp + 8]
push ecx
call fcn.004fd2c0
add esp, 0xc
test eax, eax
jne 0x4f7a21
xor eax, eax
jmp 0x4f7a5b
mov edx, dword [ebp - 0xc]
push edx
mov eax, dword [ebp + 8]
mov ecx, dword [eax]
push ecx
mov edx, dword [ebp + 8]
mov eax, dword [edx + 0x10]
push eax
call fcn.00520f60
add esp, 0xc
mov ecx, dword [ebp + 8]
mov edx, dword [ecx]
add edx, dword [ebp - 0xc]
mov eax, dword [ebp + 8]
mov dword [eax], edx
mov ecx, dword [ebp + 8]
mov edx, dword [ecx + 0x10]
add edx, dword [ebp - 0xc]
mov eax, dword [ebp + 8]
mov dword [eax + 0x10], edx
mov eax, 1
mov esp, ebp
pop ebp
ret