1 files changed, 57 insertions, 0 deletions
diff --git a/WireGuard/Shared/Model/Legacy/LegacyIPAddressRange.swift b/WireGuard/Shared/Model/Legacy/LegacyIPAddressRange.swift
new file mode 100644
index 0000000..ade87f2
--- /dev/null
+++ b/WireGuard/Shared/Model/Legacy/LegacyIPAddressRange.swift
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2018 WireGuard LLC. All Rights Reserved.
+
+import Foundation
+import Network
+
+struct LegacyIPAddressRange: Codable {
+    let address: IPAddress
+    let networkPrefixLength: UInt8
+    
+    public init(from decoder: Decoder) throws {
+        let container = try decoder.singleValueContainer()
+        var data = try container.decode(Data.self)
+        networkPrefixLength = data.removeLast()
+        let ipAddressFromData: IPAddress? = {
+            switch data.count {
+            case 4: return IPv4Address(data)
+            case 16: return IPv6Address(data)
+            default: return nil
+            }
+        }()
+        guard let ipAddress = ipAddressFromData else { throw DecodingError.invalidData }
+        address = ipAddress
+    }
+    
+    public func encode(to encoder: Encoder) throws {
+        var container = encoder.singleValueContainer()
+        let addressDataLength: Int
+        if address is IPv4Address {
+            addressDataLength = 4
+        } else if address is IPv6Address {
+            addressDataLength = 16
+        } else {
+            fatalError()
+        }
+        var data = Data(capacity: addressDataLength + 1)
+        data.append(address.rawValue)
+        data.append(networkPrefixLength)
+        try container.encode(data)
+    }
+
+    enum DecodingError: Error {
+        case invalidData
+    }
+}
+
+extension LegacyIPAddressRange {
+    var migrated: IPAddressRange {
+        return IPAddressRange(address: address, networkPrefixLength: networkPrefixLength)
+    }
+}
+
+extension Array where Element == LegacyIPAddressRange {
+    var migrated: [IPAddressRange] {
+        return map { $0.migrated }
+    }
+}