Function at 0x408580
Capabilities:
Compute adler32 checksum

Disassembly:
push r15
push r14
push r13
push r12
push rbp
push rdi
push rsi
push rbx
sub rsp, 0x38
mov eax, ecx
mov rbx, rdx
mov qword [rsp + 0x90], r8
movzx r15d, cx
shr eax, 0x10
cmp r8, 1
mov dword [rsp + 0x14], eax
je 0x4087ba
test rdx, rdx
je 0x408943
cmp qword [rsp + 0x90], 0xf
jbe 0x40872b
cmp qword [rsp + 0x90], 0x15af
lea rax, [rdx + 0x15b0]
mov qword [rsp + 0x18], rax
jbe 0x408962
mov rax, qword [rsp + 0x18]
lea rsi, [rax - 0x15b0]
mov rax, qword [rsp + 0x90]
sub rax, 0x15b0
mov qword [rsp + 0x20], rax
nop word [rax + rax]
movzx eax, byte [rsi]
add rsi, 0x10
movzx r14d, byte [rsi - 0xf]
movzx r13d, byte [rsi - 0xe]
movzx r12d, byte [rsi - 0xd]
add eax, r15d
movzx ebp, byte [rsi - 0xc]
add r14d, eax
movzx edi, byte [rsi - 0xb]
add r13d, r14d
movzx ebx, byte [rsi - 0xa]
add eax, r14d
movzx r11d, byte [rsi - 9]
add r12d, r13d
add eax, r13d
add ebp, r12d
add eax, r12d
movzx r10d, byte [rsi - 6]
add edi, ebp
add eax, ebp
movzx r9d, byte [rsi - 5]
add ebx, edi
add edi, eax
movzx r8d, byte [rsi - 4]
lea edx, [r11 + rbx]
movzx r11d, byte [rsi - 8]
add ebx, edi
mov dword [rsp + 0xc], edx
add ebx, dword [rsp + 0xc]
movzx r15d, byte [rsi - 1]
add r11d, edx
movzx edx, byte [rsi - 2]
mov ecx, r11d
movzx r11d, byte [rsi - 7]
mov dword [rsp + 0x10], ecx
add ebx, dword [rsp + 0x10]
add r11d, ecx
movzx ecx, byte [rsi - 3]
add r10d, r11d
add r11d, ebx
add r9d, r10d
add r10d, r11d
add r8d, r9d
add r9d, r10d
add ecx, r8d
add r8d, r9d
add edx, ecx
add ecx, r8d
add r15d, edx
add edx, ecx
add edx, r15d
add dword [rsp + 0x14], edx
cmp rsi, qword [rsp + 0x18]
jne 0x408610
mov eax, 0x80078071
mov edi, dword [rsp + 0x14]
mul r15d
shr edx, 0xf
imul eax, edx, 0xfff1
sub r15d, eax
mov eax, 0x80078071
mul edi
shr edx, 0xf
imul eax, edx, 0xfff1
sub edi, eax
cmp qword [rsp + 0x20], 0x15af
mov dword [rsp + 0x14], edi
lea rax, [rsi + 0x15b0]
mov qword [rsp + 0x18], rax
jbe 0x4087a1
mov rax, qword [rsp + 0x20]
mov qword [rsp + 0x90], rax
jmp 0x4085e8
cmp qword [rsp + 0x90], 0
je 0x40875c
mov rdx, qword [rsp + 0x90]
mov eax, dword [rsp + 0x14]
add rdx, rbx
add rbx, 1
movzx ecx, byte [rbx - 1]
add r15d, ecx
add eax, r15d
cmp rbx, rdx
jne 0x408745
mov dword [rsp + 0x14], eax
cmp r15d, 0xfff0
mov edx, 0x80078071
mov edi, dword [rsp + 0x14]
lea eax, [r15 - 0xfff1]
cmova r15d, eax
mov eax, dword [rsp + 0x14]
mul edx
shr edx, 0xf
imul eax, edx, 0xfff1
sub edi, eax
mov eax, edi
shl eax, 0x10
or eax, r15d
add rsp, 0x38
pop rbx
pop rsi
pop rdi
pop rbp
pop r12
pop r13
pop r14
pop r15
ret
mov rax, qword [rsp + 0x20]
mov rbx, rsi
test rax, rax
jne 0x4087ea
mov eax, dword [rsp + 0x14]
shl eax, 0x10
or eax, r15d
jmp 0x408790
movzx edx, byte [rdx]
add edx, r15d
lea eax, [rdx - 0xfff1]
cmp edx, 0xfff0
cmova edx, eax
mov eax, dword [rsp + 0x14]
add eax, edx
lea ecx, [rax - 0xfff1]
cmp eax, 0xfff0
cmova eax, ecx
shl eax, 0x10
or eax, edx
jmp 0x408790
cmp rax, 0xf
jbe 0x40894d
mov rax, qword [rsp + 0x20]
sub rax, 0x10
shr rax, 4
mov qword [rsp + 0x28], rax
add rax, 1
shl rax, 4
add rax, rbx
mov qword [rsp + 0x18], rax
movzx eax, byte [rbx]
add rbx, 0x10
movzx r14d, byte [rbx - 0xf]
movzx r13d, byte [rbx - 0xe]
movzx r12d, byte [rbx - 0xd]
add eax, r15d
movzx ebp, byte [rbx - 0xc]
add r14d, eax
movzx edi, byte [rbx - 0xb]
add r13d, r14d
movzx esi, byte [rbx - 0xa]
add eax, r14d
add r12d, r13d
movzx r11d, byte [rbx - 9]
add eax, r13d
add ebp, r12d
movzx r10d, byte [rbx - 8]
add eax, r12d
add edi, ebp
movzx r9d, byte [rbx - 7]
add eax, ebp
movzx edx, byte [rbx - 6]
add esi, edi
add eax, edi
add r11d, esi
movzx r8d, byte [rbx - 4]
add eax, esi
add r10d, r11d
add eax, r11d
movzx r15d, byte [rbx - 1]
add r9d, r10d
add eax, r10d
lea ecx, [rdx + r9]
movzx edx, byte [rbx - 5]
add eax, r9d
mov dword [rsp + 0xc], ecx
add eax, dword [rsp + 0xc]
add edx, ecx
movzx ecx, byte [rbx - 3]
mov dword [rsp + 0x10], edx
add eax, dword [rsp + 0x10]
add r8d, edx
movzx edx, byte [rbx - 2]
add ecx, r8d
add eax, r8d
add edx, ecx
add eax, ecx
add r15d, edx
add eax, edx
add eax, r15d
add dword [rsp + 0x14], eax
cmp rbx, qword [rsp + 0x18]
jne 0x408816
mov rax, qword [rsp + 0x28]
mov rdi, qword [rsp + 0x20]
neg rax
shl rax, 4
lea rax, [rdi + rax - 0x11]
and edi, 0xf
je 0x408913
mov rdi, qword [rsp + 0x18]
mov ecx, dword [rsp + 0x14]
lea rdx, [rdi + rax + 1]
mov rax, rdi
add rax, 1
movzx r8d, byte [rax - 1]
add r15d, r8d
add ecx, r15d
cmp rax, rdx
jne 0x4088fb
mov dword [rsp + 0x14], ecx
mov eax, r15d
mov ecx, 0x80078071
mul ecx
mov eax, edx
shr eax, 0xf
imul eax, eax, 0xfff1
sub r15d, eax
mov eax, dword [rsp + 0x14]
mul ecx
shr edx, 0xf
imul eax, edx, 0xfff1
sub dword [rsp + 0x14], eax
jmp 0x4087ae
mov eax, 1
jmp 0x408790
mov rax, qword [rsp + 0x90]
mov qword [rsp + 0x18], rsi
sub rax, 0x15b1
jmp 0x4088ea
mov rax, qword [rsp + 0x90]
mov qword [rsp + 0x20], rax
jmp 0x4087f4
mov r8d, r8d
jmp 0x408580