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AK: Add IPv4Address::netmask_from_cidr

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Maciej 2022-03-26 10:35:52 +01:00 committed by Sam Atkins
parent b85666b3d2
commit 36676a1604
Notes: sideshowbarker 2024-07-17 10:10:18 +09:00 
Author: https://github.com/sppmacd
Commit: https://github.com/SerenityOS/serenity/commit/36676a1604
Pull-request: https://github.com/SerenityOS/serenity/pull/13259
Reviewed-by: https://github.com/AtkinsSJ ✅
Reviewed-by: https://github.com/IdanHo
2 changed files with 21 additions and 1 deletions
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7
AK/IPv4Address.h
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@ -119,6 +119,13 @@ public:
return IPv4Address(a, b, c, d);
}
static constexpr IPv4Address netmask_from_cidr(int cidr)
{
VERIFY(cidr >= 0 && cidr <= 32);
u32 value = 0xffffffffull << (32 - cidr);
return IPv4Address((value & 0xff000000) >> 24, (value & 0xff0000) >> 16, (value & 0xff00) >> 8, (value & 0xff));
}
constexpr in_addr_t to_in_addr_t() const { return m_data; }
constexpr u32 to_u32() const { return m_data; }

15
Tests/AK/TestIPv4Address.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2020, the SerenityOS developers.
* Copyright (c) 2020-2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -151,3 +151,16 @@ TEST_CASE(should_compare)
EXPECT(addr_a != addr_b);
EXPECT(addr_a == addr_a);
}
TEST_CASE(netmask_from_cidr)
{
EXPECT(IPv4Address::netmask_from_cidr(24) == IPv4Address(255, 255, 255, 0));
EXPECT(IPv4Address::netmask_from_cidr(0) == IPv4Address(0, 0, 0, 0));
EXPECT(IPv4Address::netmask_from_cidr(32) == IPv4Address(255, 255, 255, 255));
EXPECT(IPv4Address::netmask_from_cidr(28) == IPv4Address(255, 255, 255, 240));
EXPECT(IPv4Address::netmask_from_cidr(22) == IPv4Address(255, 255, 252, 0));
EXPECT(IPv4Address::netmask_from_cidr(14) == IPv4Address(255, 252, 0, 0));
EXPECT(IPv4Address::netmask_from_cidr(6) == IPv4Address(252, 0, 0, 0));
}