Function at 0x1800b7850
Capabilities:
Get file size
Read file on windows

Disassembly:
mov rax, rsp
push rbp
push rsi
push rdi
push r12
push r13
push r14
push r15
lea rbp, [rsp - 0x70]
sub rsp, 0x170
mov qword [rsp + 0x68], 0xfffffffffffffffe
mov qword [rax + 0x18], rbx
movaps xmmword [rax - 0x48], xmm6
mov rax, qword [0x180126050]
xor rax, rsp
mov qword [rbp + 0x58], rax
mov rbx, rdx
mov rdi, rcx
xor r13d, r13d
mov byte [rcx + 0x10], r13b
mov rax, qword [rcx]
call qword [rax]
mov qword [rsp + 0x30], r13
lea ecx, [r13 + 8]
call fcn.1800bd294
mov qword [rsp + 0x38], rax
mov qword [rax], 0xffffffffffffffff
mov qword [rsp + 0x30], rax
mov dword [rsp + 0x28], 0x80
mov dword [rsp + 0x20], 3
lea r9d, [r13 + 1]
mov r8d, 0x80000000
mov rdx, rbx
lea rcx, [rsp + 0x30]
call fcn.1800231a0
test al, al
jne 0x1800b7932
lea rcx, [rbp + 0x38]
call fcn.1800b8240
nop
cmp qword [rdi + 8], r13
je 0x1800b791f
lea rax, [rsp + 0x70]
mov qword [rsp + 0x38], rax
lea rdx, [rbp + 0x38]
lea rcx, [rsp + 0x70]
call fcn.1800052b0
nop
mov rcx, qword [rdi + 8]
mov r9, qword [rcx]
mov r8, rax
xor edx, edx
call qword [r9 + 8]
nop
lea rcx, [rbp + 0x38]
call fcn.180003440
mov rbx, qword [rsp + 0x30]
jmp 0x1800b7b71
mov rbx, qword [rsp + 0x30]
test rbx, rbx
je 0x1800b7b20
mov rcx, qword [rbx]
cmp rcx, 0xffffffffffffffff
je 0x1800b7b20
lea rdx, [rbp - 0xc]
call qword [sym.imp.KERNEL32.dll_GetFileSize]
mov esi, eax
cmp eax, 0xffffffff
jne 0x1800b796c
call qword [sym.imp.KERNEL32.dll_GetLastError]
test eax, eax
jne 0x1800b7b20
mov r14d, dword [rbp - 0xc]
shl r14, 0x20
mov rax, rsi
add r14, rsi
je 0x1800b7b20
mov r12b, 1
mov dword [rbp - 0x10], r13d
mov rsi, r13
mov ecx, 0x10000
call fcn.1800bd5c0
mov r15, rax
movsd xmm6, qword [0x1800e6878]
nop
test r15, r15
je 0x1800b7a9b
cmp qword [rbx], 0xffffffffffffffff
je 0x1800b7ab5
mov dword [rbp - 0x10], r13d
mov qword [rsp + 0x20], r13
lea r9, [rbp - 0x10]
mov r8d, 0x10000
mov rdx, r15
mov rcx, qword [rbx]
call qword [sym.imp.KERNEL32.dll_ReadFile]
test eax, eax
je 0x1800b7a9b
movzx eax, byte [rdi + 0x10]
test al, al
jne 0x1800b7a43
mov r8d, dword [rbp - 0x10]
test r8d, r8d
je 0x1800b7a96
mov rax, qword [rdi]
mov rdx, r15
mov rcx, rdi
call qword [rax + 8]
mov eax, dword [rbp - 0x10]
add rsi, rax
mov rcx, qword [rdi + 8]
test rcx, rcx
je 0x1800b7a35
mov rax, qword [rcx]
xorps xmm1, xmm1
cvtsi2sd xmm1, rsi
test rsi, rsi
jns 0x1800b7a1e
addsd xmm1, xmm6
xorps xmm0, xmm0
cvtsi2sd xmm0, r14
test r14, r14
jns 0x1800b7a2f
addsd xmm0, xmm6
divsd xmm1, xmm0
call qword [rax]
mov dword [rbp - 0x10], r13d
mov rbx, qword [rsp + 0x30]
jmp 0x1800b79a0
mov qword [rbp + 8], r13
mov qword [rbp + 0x10], r13
mov qword [rbp + 8], r13
mov qword [rbp + 0x10], 7
mov word [rbp - 8], r13w
cmp qword [rdi + 8], 0
je 0x1800b7a8a
lea rax, [rbp - 0x70]
mov qword [rsp + 0x38], rax
lea rdx, [rbp - 8]
lea rcx, [rbp - 0x70]
call fcn.1800052b0
nop
mov rcx, qword [rdi + 8]
mov r9, qword [rcx]
mov r8, rax
xor edx, edx
call qword [r9 + 8]
xor r12b, r12b
lea rcx, [rbp - 8]
call fcn.180003440
mov rbx, qword [rsp + 0x30]
mov rcx, qword [rbx]
cmp rcx, 0xffffffffffffffff
je 0x1800b7ab5
call qword [sym.imp.KERNEL32.dll_CloseHandle]
test eax, eax
je 0x1800b7ab5
mov qword [rbx], 0xffffffffffffffff
mov rcx, r15
call fcn.1800bd2d0
mov rax, qword [rdi]
mov rcx, rdi
call qword [rax + 0x10]
mov qword [rsp + 0x58], r13
mov qword [rsp + 0x60], r13
mov qword [rsp + 0x58], r13
mov qword [rsp + 0x60], 7
mov word [rsp + 0x48], r13w
cmp qword [rdi + 8], 0
je 0x1800b7b14
lea rax, [rbp - 0x50]
mov qword [rsp + 0x38], rax
lea rdx, [rsp + 0x48]
lea rcx, [rbp - 0x50]
call fcn.1800052b0
nop
mov rcx, qword [rdi + 8]
mov r9, qword [rcx]
mov r8, rax
mov dl, 1
call qword [r9 + 8]
nop
lea rcx, [rsp + 0x48]
call fcn.180003440
jmp 0x1800b7b74
mov qword [rbp + 0x28], r13
mov qword [rbp + 0x30], r13
mov qword [rbp + 0x28], r13
mov qword [rbp + 0x30], 7
mov word [rbp + 0x18], r13w
cmp qword [rdi + 8], 0
je 0x1800b7b68
lea rax, [rbp - 0x30]
mov qword [rsp + 0x38], rax
lea rdx, [rbp + 0x18]
lea rcx, [rbp - 0x30]
call fcn.1800052b0
nop
mov rcx, qword [rdi + 8]
mov r9, qword [rcx]
mov r8, rax
xor edx, edx
call qword [r9 + 8]
nop
lea rcx, [rbp + 0x18]
call fcn.180003440
xor r12b, r12b
test rbx, rbx
je 0x1800b7ba1
mov rcx, qword [rbx]
lea r8, [rcx - 1]
cmp r8, 0xfffffffffffffffd
ja 0x1800b7b8f
call qword [sym.imp.KERNEL32.dll_CloseHandle]
mov qword [rbx], r13
mov edx, 8
mov rcx, rbx
call fcn.1800bd2d0
mov qword [rsp + 0x30], r13
movzx eax, r12b
mov rcx, qword [rbp + 0x58]
xor rcx, rsp
call fcn.1800bd270
mov rbx, qword [rsp + 0x1c0]
movaps xmm6, xmmword [rsp + 0x160]
add rsp, 0x170
pop r15
pop r14
pop r13
pop r12
pop rdi
pop rsi
pop rbp
ret