Function at 0x507480
Capabilities:
Compute adler32 checksum

Disassembly:
jmp 0x507540
mov ecx, dword [esp + 4]
push ebx
mov ebx, dword [esp + 0x10]
push esi
mov esi, ecx
and ecx, 0xffff
shr esi, 0x10
cmp ebx, 1
jne 0x50758b
mov eax, dword [esp + 0x10]
movzx eax, byte [eax]
add ecx, eax
cmp ecx, 0xfff1
jb 0x507571
sub ecx, 0xfff1
add esi, ecx
cmp esi, 0xfff1
jb 0x507581
sub esi, 0xfff1
shl esi, 0x10
or esi, ecx
mov eax, esi
pop esi
pop ebx
ret
push edi
mov edi, dword [esp + 0x14]
test edi, edi
jne 0x50759b
lea eax, [edi + 1]
pop edi
pop esi
pop ebx
ret
cmp ebx, 0x10
jae 0x5075db
test ebx, ebx
je 0x5075b1
movzx eax, byte [edi]
lea edi, [edi + 1]
add ecx, eax
add esi, ecx
dec ebx
jne 0x5075a4
cmp ecx, 0xfff1
jb 0x5075bf
sub ecx, 0xfff1
mov eax, 0x80078071
mul esi
pop edi
shr edx, 0xf
mov eax, edx
shl eax, 4
sub eax, edx
add eax, esi
shl eax, 0x10
pop esi
or eax, ecx
pop ebx
ret
cmp ebx, 0x15b0
jb 0x5076c5
mov eax, 0x5e6ea9af
mul ebx
push ebp
mov ebp, edx
shr ebp, 0xb
jmp 0x507600
sub ebx, 0x15b0
mov edx, 0x15b
jmp 0x507610
movzx eax, byte [edi]
add ecx, eax
movzx eax, byte [edi + 1]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 2]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 3]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 4]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 5]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 6]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 7]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 8]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 9]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 0xa]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 0xb]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 0xc]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 0xd]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 0xe]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 0xf]
add esi, ecx
add edi, 0x10
add ecx, eax
add esi, ecx
dec edx
jne 0x507610
mov eax, 0x80078071
mul ecx
shr edx, 0xf
imul eax, edx, 0xffff000f
add ecx, eax
mov eax, 0x80078071
mul esi
shr edx, 0xf
imul eax, edx, 0xffff000f
add esi, eax
dec ebp
jne 0x507600
pop ebp
test ebx, ebx
je 0x5077a1
cmp ebx, 0x10
jb 0x50776c
mov edx, ebx
shr edx, 4
jmp 0x5076e0
movzx eax, byte [edi]
sub ebx, 0x10
add ecx, eax
movzx eax, byte [edi + 1]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 2]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 3]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 4]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 5]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 6]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 7]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 8]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 9]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 0xa]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 0xb]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 0xc]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 0xd]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 0xe]
add esi, ecx
add ecx, eax
movzx eax, byte [edi + 0xf]
add esi, ecx
add edi, 0x10
add ecx, eax
add esi, ecx
dec edx
jne 0x5076e0
test ebx, ebx
je 0x50777d
movzx eax, byte [edi]
lea edi, [edi + 1]
add ecx, eax
add esi, ecx
dec ebx
jne 0x507770
mov eax, 0x80078071
mul ecx
mov eax, 0x80078071
shr edx, 0xf
imul edx, edx, 0xffff000f
add ecx, edx
mul esi
shr edx, 0xf
imul eax, edx, 0xffff000f
add esi, eax
shl esi, 0x10
or esi, ecx
pop edi
mov eax, esi
pop esi
pop ebx
ret