chore: import upstream snapshot with attribution

Sources/ContainerizationEXT4/EXT4+Extensions.swift

@@ -0,0 +1,97 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2025-2026 Apple Inc. and the Containerization project authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//===----------------------------------------------------------------------===//
+
+extension EXT4.InodeFlag {
+    public static func | (lhs: Self, rhs: Self) -> Self {
+        Self(rawValue: lhs.rawValue | rhs.rawValue)
+    }
+
+    public static func | (lhs: Self, rhs: Self) -> UInt32 {
+        lhs.rawValue | rhs.rawValue
+    }
+
+    public static func | (lhs: Self, rhs: UInt32) -> UInt32 {
+        lhs.rawValue | rhs
+    }
+}
+
+extension EXT4.CompatFeature {
+    public static func | (lhs: Self, rhs: Self) -> Self {
+        EXT4.CompatFeature(rawValue: lhs.rawValue | rhs.rawValue)
+    }
+
+    public static func | (lhs: Self, rhs: Self) -> UInt32 {
+        lhs.rawValue | rhs.rawValue
+    }
+}
+
+extension EXT4.IncompatFeature {
+    public static func | (lhs: Self, rhs: Self) -> Self {
+        EXT4.IncompatFeature(rawValue: lhs.rawValue | rhs.rawValue)
+    }
+
+    public static func | (lhs: Self, rhs: Self) -> UInt32 {
+        lhs.rawValue | rhs.rawValue
+    }
+}
+
+extension EXT4.RoCompatFeature {
+    public static func | (lhs: Self, rhs: Self) -> Self {
+        EXT4.RoCompatFeature(rawValue: lhs.rawValue | rhs.rawValue)
+    }
+
+    public static func | (lhs: Self, rhs: Self) -> UInt32 {
+        lhs.rawValue | rhs.rawValue
+    }
+}
+
+extension EXT4.FileModeFlag {
+    public static func | (lhs: Self, rhs: Self) -> Self {
+        Self(rawValue: lhs.rawValue | rhs.rawValue)
+    }
+
+    public static func | (lhs: Self, rhs: Self) -> UInt16 {
+        lhs.rawValue | rhs.rawValue
+    }
+}
+
+extension EXT4.XAttrEntry {
+    init(using bytes: [UInt8]) throws {
+        guard bytes.count == 16 else {
+            throw EXT4.Error.invalidXattrEntry
+        }
+        nameLength = bytes[0]
+        nameIndex = bytes[1]
+        let rawValue = Array(bytes[2...3])
+        valueOffset = rawValue.withUnsafeBytes { $0.loadLittleEndian(as: UInt16.self) }
+
+        let rawValueInum = Array(bytes[4...7])
+        valueInum = rawValueInum.withUnsafeBytes { $0.loadLittleEndian(as: UInt32.self) }
+
+        let rawSize = Array(bytes[8...11])
+        valueSize = rawSize.withUnsafeBytes { $0.loadLittleEndian(as: UInt32.self) }
+
+        let rawHash = Array(bytes[12...])
+        hash = rawHash.withUnsafeBytes { $0.loadLittleEndian(as: UInt32.self) }
+    }
+}
+
+extension EXT4 {
+    static func tupleToArray<T>(_ tuple: T) -> [UInt8] {
+        let reflection = Mirror(reflecting: tuple)
+        return reflection.children.compactMap { $0.value as? UInt8 }
+    }
+}