Function at 0x519860
Capabilities:
Validate payment card number using luhn algorithm

Disassembly:
sub esp, 0x10
push ebx
mov ebx, dword [esp + 0x1c]
push ebp
mov ebp, dword [esp + 0x30]
push esi
push edi
mov edi, dword [esp + 0x24]
mov dword [ebp], 0
mov al, byte [ebx]
cmp al, 0xa
je 0x519dd7
cmp al, 0xd
je 0x519dd7
mov ecx, dword [edi + 0xc4]
lea ebp, [edi + 0xc4]
mov esi, 4
lea eax, [ecx + 1]
mov dword [ebp], eax
test ecx, ecx
jne 0x519cf1
mov dword [edi + 0xd0], ecx
mov eax, dword [edi + 0x18]
mov eax, dword [eax + 0x2ac]
mov eax, dword [eax + 0x48]
test al, 3
je 0x519a79
mov al, byte [ebx]
mov esi, ebx
test al, al
je 0x5198e1
nop dword [eax]
cmp al, 0x20
je 0x5198d9
cmp byte [esi], 9
jne 0x5198e1
mov al, byte [esi + 1]
inc esi
test al, al
jne 0x5198d0
push 5
push str.HTTP_
push esi
call fcn.0063a820
add esp, 0xc
test eax, eax
jne 0x5199a4
movsx ecx, byte [esi + 5]
mov eax, ecx
sub eax, 0x31
je 0x5199d4
sub eax, 1
je 0x51992d
sub eax, 1
je 0x51992d
push str.Unsupported_HTTP_version_in_response
push edi
call fcn.00507ab0
add esp, 8
mov eax, 1
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x10
ret
mov al, byte [esi + 6]
cmp al, 0x20
je 0x519938
cmp al, 9
jne 0x5199a4
lea eax, [ecx - 0x30]
lea eax, [eax + eax*4]
add eax, eax
mov dword [edi + 0xd0], eax
mov cl, byte [esi + 7]
lea eax, [ecx - 0x30]
cmp al, 9
ja 0x5199a4
mov dl, byte [esi + 8]
lea eax, [edx - 0x30]
cmp al, 9
ja 0x5199a4
mov dh, byte [esi + 9]
mov al, dh
sub al, 0x30
cmp al, 9
ja 0x5199a4
movsx eax, cl
lea ecx, [eax + eax*4]
movsx eax, dl
lea eax, [eax + ecx*2]
lea ecx, [eax + eax*4]
movsx eax, dh
lea eax, [eax + ecx*2]
add eax, 0xffffeb30
mov dword [edi + 0xd4], eax
mov al, byte [esi + 0xa]
cmp al, 0x20
je 0x519b56
cmp al, 9
je 0x519b56
cmp al, 0xa
jl 0x5199a4
cmp al, 0xd
jle 0x519b56
push dword [esp + 0x2c]
push ebx
push edi
call fcn.00518c70
add esp, 0xc
cmp eax, 1
jne 0x519d20
mov dword [edi + 0xd4], 0xc8
mov dword [edi + 0xd0], 0xa
jmp 0x519b56
cmp byte [esi + 6], 0x2e
jne 0x519a5e
mov al, byte [esi + 7]
cmp al, 0x30
je 0x5199e9
cmp al, 0x31
jne 0x519a5e
mov cl, byte [esi + 8]
cmp cl, 0x20
je 0x5199f6
cmp cl, 9
jne 0x519a5e
movsx eax, al
sub eax, 0x26
mov dword [edi + 0xd0], eax
mov cl, byte [esi + 9]
lea eax, [ecx - 0x30]
cmp al, 9
ja 0x519a5e
mov dl, byte [esi + 0xa]
lea eax, [edx - 0x30]
cmp al, 9
ja 0x519a5e
mov dh, byte [esi + 0xb]
mov al, dh
sub al, 0x30
cmp al, 9
ja 0x519a5e
movsx eax, cl
lea ecx, [eax + eax*4]
movsx eax, dl
lea eax, [eax + ecx*2]
lea ecx, [eax + eax*4]
movsx eax, dh
lea eax, [eax + ecx*2]
add eax, 0xffffeb30
mov dword [edi + 0xd4], eax
mov al, byte [esi + 0xc]
cmp al, 0x20
je 0x519b56
cmp al, 9
je 0x519b56
sub al, 0xa
cmp al, 3
jbe 0x519b56
push str.Unsupported_HTTP_1_subversion_in_response
push edi
call fcn.00507ab0
add esp, 8
mov eax, 1
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x10
ret
test eax, 0x40000
je 0x519d20
mov al, byte [ebx]
mov esi, ebx
test al, al
je 0x519aa1
nop dword [eax]
cmp al, 0x20
je 0x519a99
cmp byte [esi], 9
jne 0x519aa1
mov al, byte [esi + 1]
inc esi
test al, al
jne 0x519a90
push 5
push str.RTSP_
push esi
call fcn.0063a820
add esp, 0xc
test eax, eax
jne 0x519d20
mov al, byte [esi + 5]
sub al, 0x30
cmp al, 9
ja 0x519d27
cmp byte [esi + 6], 0x2e
jne 0x519d27
mov al, byte [esi + 7]
sub al, 0x30
cmp al, 9
ja 0x519d27
mov al, byte [esi + 8]
cmp al, 0x20
je 0x519aec
cmp al, 9
jne 0x519d27
mov cl, byte [esi + 9]
lea eax, [ecx - 0x30]
cmp al, 9
ja 0x519d27
mov dl, byte [esi + 0xa]
lea eax, [edx - 0x30]
cmp al, 9
ja 0x519d27
mov dh, byte [esi + 0xb]
mov al, dh
sub al, 0x30
cmp al, 9
ja 0x519d27
movsx eax, cl
lea ecx, [eax + eax*4]
movsx eax, dl
lea eax, [eax + ecx*2]
lea ecx, [eax + eax*4]
movsx eax, dh
lea eax, [eax + ecx*2]
add eax, 0xffffeb30
mov dword [edi + 0xd4], eax
mov al, byte [esi + 0xc]
cmp al, 0x20
je 0x519b4c
cmp al, 9
je 0x519b4c
sub al, 0xa
cmp al, 3
ja 0x519d27
mov dword [edi + 0xd0], 0xb
mov ecx, dword [edi + 0xd0]
mov eax, ecx
mov esi, dword [edi + 0x18]
sub eax, 0xa
je 0x519b80
sub eax, 1
je 0x519b80
mov eax, ecx
mov ecx, 0xa
cdq
idiv ecx
mov ebp, eax
mov ecx, edx
mov eax, str.Unsupported_HTTP_version___u._d__in_response
jmp 0x519bb7
mov al, byte [esi + 0x514]
test al, al
je 0x519bd0
movzx ecx, al
mov eax, 0xcccccccd
mul ecx
mov eax, 0x66666667
mov ebp, edx
imul dword [edi + 0xd0]
shr ebp, 3
sar edx, 2
mov ecx, edx
shr ecx, 0x1f
add ecx, edx
cmp ecx, ebp
je 0x519bd0
mov eax, str.Version_mismatch__from_HTTP__u_to_HTTP__u_
push ecx
push ebp
push eax
push edi
call fcn.00507ab0
add esp, 0x10
mov eax, 1
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x10
ret
mov eax, dword [edi + 0xd4]
mov dword [edi + 0xd10], eax
mov eax, dword [edi + 0xd0]
mov dword [edi + 0xd18], eax
movzx eax, byte [edi + 0xd0]
mov byte [esi + 0x514], al
mov al, byte [edi + 0xced]
test al, al
je 0x519c0a
movzx eax, al
cmp eax, dword [edi + 0xd0]
jle 0x519c16
mov al, byte [edi + 0xd0]
mov byte [edi + 0xced], al
mov eax, dword [edi + 0xbd0]
or eax, dword [edi + 0xbd4]
je 0x519c40
cmp byte [edi + 0xcee], 0
jne 0x519c40
cmp dword [edi + 0xd4], 0x1a0
jne 0x519c40
mov byte [edi + 0x132], 1
mov eax, dword [edi + 0xd0]
cmp eax, 0xa
jne 0x519c63
push str.HTTP_1.0__assume_close_after_body
push edi
call fcn.00507b80
push 1
push esi
call fcn.0050a170
add esp, 0x10
jmp 0x519c86
cmp eax, 0x14
je 0x519c7a
cmp dword [edi + 0xdc], 2
jne 0x519c86
cmp dword [edi + 0xd4], 0x65
jne 0x519c86
mov eax, dword [esi + 0x4e8]
mov dword [eax], 2
mov ecx, dword [edi + 0xd4]
lea eax, [ecx - 0x64]
cmp eax, 0x63
setbe al
mov byte [edi + 0x133], al
sub ecx, 0xcc
je 0x519cb7
sub ecx, 0x64
jne 0x519ce6
cmp byte [edi + 0x3b0], cl
je 0x519cb7
mov byte [edi + 0xdd0], 1
mov dword [edi + 0x88], 0
mov dword [edi + 0x8c], 0
mov dword [edi + 0x90], 0
mov dword [edi + 0x94], 0
mov byte [edi + 0x133], 1
mov esi, 0xc
lea ebp, [edi + 0xc4]
push dword [esp + 0x2c]
push 0
push ebx
call fcn.00621d00
add esp, 0xc
test eax, eax
je 0x519d34
mov eax, str.Nul_byte_in_header
push eax
push edi
call fcn.00507ab0
add esp, 8
mov eax, 8
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x10
ret
mov byte [edi + 0x129], 0
pop edi
pop esi
pop ebp
mov eax, 8
pop ebx
add esp, 0x10
ret
mov ecx, dword [ebp]
cmp ecx, 2
jl 0x519d7b
mov al, byte [ebx]
cmp al, 0x20
je 0x519d46
cmp al, 9
jne 0x519d4b
cmp ecx, 2
jg 0x519d7b
mov ebp, dword [esp + 0x2c]
push ebp
push 0x3a
push ebx
call fcn.00621d00
add esp, 0xc
test eax, eax
jne 0x519d7f
mov eax, str.Header_without_colon
push eax
push edi
call fcn.00507ab0
add esp, 8
mov eax, 8
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x10
ret
mov ebp, dword [esp + 0x2c]
push ebp
push ebx
push edi
call fcn.005173c0
add esp, 0xc
test eax, eax
jne 0x519e52
push ebp
push ebx
push 1
push edi
call fcn.00507a10
mov eax, dword [edi + 0xd4]
add esp, 0x10
sub eax, 0x64
cmp eax, 0x64
jae 0x519db0
or esi, 0x20
push ebp
push ebx
push esi
push edi
call fcn.00508cf0
add esp, 0x10
test eax, eax
jne 0x519e52
push eax
push ebp
push edi
call fcn.00516a00
add esp, 0xc
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x10
ret
mov esi, dword [esp + 0x2c]
lea eax, [esi + 1]
push eax
lea eax, [esp + 0x14]
push eax
call fcn.004fabc0
push esi
lea eax, [esp + 0x1c]
push ebx
push eax
call fcn.004fab80
add esp, 0x14
test eax, eax
jne 0x519e52
lea eax, [edi + 0x878]
push eax
call fcn.004fac00
add esp, 4
lea eax, [esp + 0x24]
push eax
push dword [esp + 0x38]
lea eax, [esp + 0x18]
push dword [esp + 0x38]
push eax
call fcn.004fabe0
add esp, 4
push eax
lea eax, [esp + 0x20]
push eax
call fcn.004fabf0
add esp, 4
push eax
push edi
call fcn.00518dc0
mov ecx, dword [esp + 0x3c]
mov esi, eax
add dword [ebp], ecx
lea eax, [esp + 0x28]
push eax
call fcn.004fab90
add esp, 0x1c
mov eax, esi
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x10
ret