wehub-resource-sync
89 lines
3.0 KiB
Swift
89 lines
3.0 KiB
Swift
//===----------------------------------------------------------------------===//
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// Copyright © 2025-2026 Apple Inc. and the Containerization project authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//===----------------------------------------------------------------------===//
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/// CIDR prefix length (e.g., `/24` for a 24-bit network mask).
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@frozen
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public struct Prefix: Sendable, CustomStringConvertible, Hashable, Codable {
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public let length: UInt8
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/// Create a prefix (0-128). Use `ipv4(_:)` or `ipv6(_:)` for version-specific validation.
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public init?(length: UInt8) {
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guard length <= 128 else { return nil }
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self.length = length
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}
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/// Create an IPv4 prefix (0-32). Returns `nil` if length > 32.
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public static func ipv4(_ length: UInt8) -> Prefix? {
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guard length <= 32 else { return nil }
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return Prefix(unchecked: length)
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}
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/// Create an IPv6 prefix (0-128). Returns `nil` if length > 128.
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public static func ipv6(_ length: UInt8) -> Prefix? {
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guard length <= 128 else { return nil }
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return Prefix(unchecked: length)
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}
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/// Internal unchecked initializer for known-valid values.
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internal init(unchecked length: UInt8) {
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self.length = length
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}
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public var description: String {
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"\(length)"
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}
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}
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extension Prefix {
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/// Computes a 32-bit mask for the suffix (host) portion of an IPv4 address.
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///
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/// Example: Prefix `/24` → `0x0000_00FF` (255 host addresses)
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@inlinable
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public var suffixMask32: UInt32 {
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if self.length <= 0 {
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return 0xffff_ffff
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}
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return self.length >= 32 ? 0x0000_0000 : (1 << (32 - self.length)) - 1
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}
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/// Network portion mask (high-order bits) for IPv4.
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///
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/// Example: Prefix `/24` → `0xFFFF_FF00` (255.255.255.0)
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@inlinable
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public var prefixMask32: UInt32 {
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~self.suffixMask32
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}
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/// Computes a 128-bit mask for the suffix (host) portion of an IPv6 address.
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///
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/// Example: Prefix `/64` → `0x0000_0000_0000_0000_FFFF_FFFF_FFFF_FFFF`
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@inlinable
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public var suffixMask128: UInt128 {
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if self.length <= 0 {
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return UInt128.max
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}
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return self.length >= 128 ? 0 : (1 << (128 - self.length)) - 1
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}
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/// Network portion mask (high-order bits) for IPv6.
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///
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/// Example: Prefix `/64` → `0xFFFF_FFFF_FFFF_FFFF_0000_0000_0000_0000`
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@inlinable
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public var prefixMask128: UInt128 {
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~self.suffixMask128
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}
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}
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