AK: Add initial support for obscure IPv4 address notations

This change aims to add support for obscure IPv4 address notations, such as 1.1 (which should be equal to 1.0.0.1), or the hypothetical address 1 (which is equal to 0.0.0.1). This is supported on other platforms as well, such as Linux, Windows, *BSD, and even Haiku.

AK/IPv4Address.h

@@ -40,7 +40,7 @@ namespace AK {
 class [[gnu::packed]] IPv4Address
 {
 public:
- IPv4Address() {}
+ IPv4Address() { }
  IPv4Address(const u8 data[4])
  {
  m_data[0] = data[0];
@@ -76,12 +76,37 @@ class [[gnu::packed]] IPv4Address
  if (string.is_null())
  return {};
  auto parts = string.split_view('.');
- if (parts.size() != 4)
+
+ u32 a;
+ u32 b;
+ u32 c;
+ u32 d;
+
+ if (parts.size() == 1) {
+ a = 0;
+ b = 0;
+ c = 0;
+ d = parts[1].to_uint().value_or(256);
+ } else if (parts.size() == 2) {
+ a = parts[1].to_uint().value_or(256);
+ b = 0;
+ c = 0;
+ d = parts[2].to_uint().value_or(256);
+ } else if (parts.size() == 3) {
+ a = parts[0].to_uint().value_or(256);
+ b = parts[1].to_uint().value_or(256);
+ c = 0;
+ d = parts[2].to_uint().value_or(256);
+ } else if (parts.size() == 4) {
+ a = parts[0].to_uint().value_or(256);
+ b = parts[1].to_uint().value_or(256);
+ c = parts[2].to_uint().value_or(256);
+ d = parts[3].to_uint().value_or(256);
+ } else {
  return {};
- auto a = parts[0].to_uint().value_or(256);
- auto b = parts[1].to_uint().value_or(256);
- auto c = parts[2].to_uint().value_or(256);
- auto d = parts[3].to_uint().value_or(256);
+ }
+
+
  if (a > 255 || b > 255 || c > 255 || d > 255)
  return {};
  return IPv4Address((u8)a, (u8)b, (u8)c, (u8)d);