Function at 0x10021350
Capabilities:
Get file size
Read file on windows
Write file on windows

Disassembly:
sub esp, 0x24
push ebx
mov ebx, dword [esp + 0x30]
push ebp
push esi
push edi
xor edi, edi
cmp ebx, edi
jne 0x1002136b
pop edi
pop esi
pop ebp
xor eax, eax
pop ebx
add esp, 0x24
ret
push ebx
call fcn.10025670
add esp, 4
test eax, eax
jne 0x10021380
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x24
ret
mov eax, dword [ebx]
mov dword [esp + 0x10], edi
cmp eax, 1
jne 0x10021515
mov ebx, dword [ebx + 4]
mov ebp, dword [sym.imp.KERNEL32.dll_SetFilePointer]
push eax
push edi
push edi
push ebx
call ebp
mov esi, eax
cmp esi, 0xffffffff
jne 0x100213af
pop edi
pop esi
pop ebp
xor eax, eax
pop ebx
add esp, 0x24
ret
push edi
push ebx
call dword [sym.imp.KERNEL32.dll_GetFileSize]
mov edi, eax
mov dword [esp + 0x14], 0
sub edi, esi
test edi, edi
mov dword [esp + 0x28], edi
jle 0x1002140b
push edi
call fcn.1002d42e
add esp, 4
lea ecx, [esp + 0x1c]
mov dword [esp + 0x14], eax
push 0
push ecx
push edi
push eax
push ebx
call dword [sym.imp.KERNEL32.dll_ReadFile]
test eax, eax
jne 0x10021403
mov edx, dword [esp + 0x14]
push edx
call fcn.1002d43c
add esp, 4
xor eax, eax
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x24
ret
push 0
push 0
push esi
push ebx
call ebp
mov ecx, dword [esp + 0x38]
mov eax, 1
cmp ecx, eax
mov dword [esp + 0x10], eax
mov dword [esp + 0x20], eax
jle 0x100214b2
lea edi, [esp + 0x48]
mov eax, dword [edi + 8]
xor ebp, ebp
cmp eax, 0x80000004
jne 0x10021438
mov esi, dword [edi]
jmp 0x1002144c
push edi
call fcn.100254d0
mov esi, eax
add esp, 4
test esi, esi
je 0x10021487
mov ebp, 1
push esi
call dword [0x10040f8c]
add esp, 4
test eax, eax
jle 0x10021472
lea ecx, [esp + 0x1c]
push 0
push ecx
push eax
push esi
push ebx
call dword [sym.imp.KERNEL32.dll_WriteFile]
test eax, eax
jne 0x10021472
mov dword [esp + 0x10], eax
test ebp, ebp
je 0x1002147f
push esi
call fcn.1002d041
add esp, 4
mov eax, dword [esp + 0x10]
test eax, eax
je 0x100214f4
mov eax, dword [esp + 0x20]
mov ecx, dword [esp + 0x38]
inc eax
add edi, 0xc
cmp eax, ecx
mov dword [esp + 0x20], eax
jl 0x10021428
mov eax, dword [esp + 0x10]
test eax, eax
je 0x100214f4
mov ebp, dword [sym.imp.KERNEL32.dll_SetFilePointer]
mov edi, dword [esp + 0x28]
mov eax, 1
mov ecx, dword [esp + 0x14]
test ecx, ecx
je 0x10021873
push eax
push 0
push 0
push ebx
call ebp
lea edx, [esp + 0x1c]
push 0
push edx
push edi
mov edi, dword [esp + 0x20]
mov esi, eax
push edi
push ebx
call dword [sym.imp.KERNEL32.dll_WriteFile]
test eax, eax
je 0x100214ea
push 0
push 0
push esi
push ebx
call ebp
jmp 0x100214f8
mov dword [esp + 0x10], 0
jmp 0x100214f8
mov edi, dword [esp + 0x14]
test edi, edi
je 0x10021873
push edi
call fcn.1002d43c
mov eax, dword [esp + 0x14]
add esp, 4
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x24
ret
cmp eax, 2
jne 0x10021620
mov ebx, dword [ebx + 4]
mov ecx, ebx
mov eax, dword [ebx]
call dword [eax + 0x14]
mov edx, dword [ebx]
lea eax, [esp + 0x30]
lea ecx, [esp + 0x28]
push eax
push ecx
push 0xffffffffffffffff
push edi
mov ecx, ebx
call dword [edx + 0x30]
mov ebp, eax
mov dword [esp + 0x18], edi
test ebp, ebp
mov dword [esp + 0x24], ebp
jle 0x1002156f
push ebp
call fcn.1002d42e
mov esi, dword [esp + 0x2c]
mov ecx, ebp
mov edx, ecx
mov edi, eax
shr ecx, 2
rep movsd dword es:[edi], dword [esi]
mov ecx, edx
add esp, 4
and ecx, 3
mov dword [esp + 0x18], eax
rep movsb byte es:[edi], byte [esi]
mov edi, eax
mov eax, dword [esp + 0x38]
mov dword [esp + 0x10], 1
cmp eax, 1
jle 0x100215e7
dec eax
lea edi, [esp + 0x48]
mov dword [esp + 0x38], eax
mov eax, dword [edi + 8]
xor ebp, ebp
cmp eax, 0x80000004
jne 0x10021599
mov esi, dword [edi]
jmp 0x100215ad
push edi
call fcn.100254d0
mov esi, eax
add esp, 4
test esi, esi
je 0x100215d1
mov ebp, 1
push esi
call dword [0x10040f8c]
add esp, 4
test eax, eax
jle 0x100215c4
mov edx, dword [ebx]
push eax
push esi
mov ecx, ebx
call dword [edx + 0x24]
test ebp, ebp
je 0x100215d1
push esi
call fcn.1002d041
add esp, 4
mov eax, dword [esp + 0x38]
add edi, 0xc
dec eax
mov dword [esp + 0x38], eax
jne 0x10021589
mov ebp, dword [esp + 0x24]
mov edi, dword [esp + 0x18]
test edi, edi
je 0x10021873
mov eax, dword [ebx]
mov ecx, ebx
call dword [eax + 0x14]
mov edx, dword [ebx]
push ebp
push edi
mov ecx, ebx
mov esi, eax
call dword [edx + 0x24]
push edi
call fcn.1002d43c
mov eax, dword [ebx]
add esp, 4
mov ecx, ebx
push 0
push esi
call dword [eax + 0x18]
mov eax, dword [esp + 0x10]
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x24
ret
cmp eax, 3
jne 0x10021873
mov edi, dword [ebx + 4]
push 1
push 0
push 0
push edi
mov dword [esp + 0x3c], edi
call dword [sym.imp.KERNEL32.dll_SetFilePointer]
mov esi, eax
cmp esi, 0xffffffff
jne 0x1002164e
pop edi
pop esi
pop ebp
xor eax, eax
pop ebx
add esp, 0x24
ret
push 0
push edi
call dword [sym.imp.KERNEL32.dll_GetFileSize]
mov ebp, eax
mov dword [esp + 0x14], 0
sub ebp, esi
test ebp, ebp
mov dword [esp + 0x1c], ebp
jle 0x100216d9
push ebp
call fcn.1002d42e
add esp, 4
lea ecx, [esp + 0x20]
mov dword [esp + 0x14], eax
push 0
push ecx
push ebp
push eax
push edi
call dword [sym.imp.KERNEL32.dll_ReadFile]
test eax, eax
jne 0x100216a3
mov edx, dword [esp + 0x14]
push edx
call fcn.1002d43c
add esp, 4
xor eax, eax
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x24
ret
mov edx, dword [ebx + 0x130]
mov eax, dword [esp + 0x20]
lea ecx, [ebx + 0xc]
mov dword [esp + 0x1c], eax
push ecx
lea ecx, [ebx + 0x2c]
push edx
mov edx, dword [esp + 0x1c]
push ecx
push eax
push edx
push esi
call fcn.100245d0
add esp, 0x18
push 0
push 0
push esi
push edi
call dword [sym.imp.KERNEL32.dll_SetFilePointer]
mov ebp, dword [esp + 0x1c]
mov ecx, dword [esp + 0x38]
mov eax, 1
cmp ecx, eax
mov dword [esp + 0x10], eax
mov dword [esp + 0x24], eax
jle 0x10021802
lea ebp, [esp + 0x48]
mov dword [esp + 0x28], ebp
push 1
push 0
push 0
push edi
mov dword [esp + 0x28], 0
call dword [sym.imp.KERNEL32.dll_SetFilePointer]
mov dword [esp + 0x30], eax
mov eax, dword [ebp + 8]
cmp eax, 0x80000004
jne 0x10021722
mov esi, dword [ebp]
jmp 0x1002173d
push ebp
call fcn.100254d0
mov esi, eax
add esp, 4
test esi, esi
je 0x100217d5
mov dword [esp + 0x18], 1
push esi
call dword [0x10040f8c]
mov ebp, eax
add esp, 4
test ebp, ebp
jle 0x100217b4
mov eax, dword [esp + 0x18]
test eax, eax
jne 0x1002177e
push ebp
call fcn.1002d12a
mov ecx, ebp
mov edi, eax
mov edx, ecx
add esp, 4
shr ecx, 2
rep movsd dword es:[edi], dword [esi]
mov ecx, edx
mov dword [esp + 0x18], 1
and ecx, 3
rep movsb byte es:[edi], byte [esi]
mov edi, dword [esp + 0x2c]
mov esi, eax
mov ecx, dword [ebx + 0x130]
lea eax, [ebx + 0xc]
push eax
mov eax, dword [esp + 0x34]
lea edx, [ebx + 0x2c]
push ecx
push edx
push ebp
push esi
push eax
call fcn.100245d0
add esp, 0x18
lea ecx, [esp + 0x20]
push 0
push ecx
push ebp
push esi
push edi
call dword [sym.imp.KERNEL32.dll_WriteFile]
test eax, eax
jne 0x100217b4
mov dword [esp + 0x10], eax
mov eax, dword [esp + 0x18]
test eax, eax
je 0x100217c5
push esi
call fcn.1002d041
add esp, 4
mov eax, dword [esp + 0x10]
test eax, eax
je 0x10021862
mov ebp, dword [esp + 0x28]
mov eax, dword [esp + 0x24]
mov ecx, dword [esp + 0x38]
inc eax
add ebp, 0xc
cmp eax, ecx
mov dword [esp + 0x24], eax
mov dword [esp + 0x28], ebp
jl 0x100216fa
mov eax, dword [esp + 0x10]
test eax, eax
je 0x10021862
mov ebp, dword [esp + 0x1c]
mov eax, 1
mov ecx, dword [esp + 0x14]
test ecx, ecx
je 0x10021873
push eax
push 0
push 0
push edi
call dword [sym.imp.KERNEL32.dll_SetFilePointer]
mov esi, eax
mov eax, dword [ebx + 0x130]
lea edx, [ebx + 0xc]
add ebx, 0x2c
push edx
push eax
push ebx
mov ebx, dword [esp + 0x20]
push ebp
push ebx
push esi
call fcn.100245d0
add esp, 0x18
lea ecx, [esp + 0x20]
push 0
push ecx
push ebp
push ebx
push edi
call dword [sym.imp.KERNEL32.dll_WriteFile]
test eax, eax
je 0x10021858
push 0
push 0
push esi
push edi
call dword [sym.imp.KERNEL32.dll_SetFilePointer]
jmp 0x10021866
mov dword [esp + 0x10], 0
jmp 0x10021866
mov ebx, dword [esp + 0x14]
test ebx, ebx
je 0x10021873
push ebx
call fcn.1002d43c
add esp, 4
mov eax, dword [esp + 0x10]
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x24
ret