Merge pull request #223 from p-x9/feature/endianness

Add property to get byte-order of the binary

Author: p-x9

Sources/MachOKit/MachOFile.swift

@@ -6,6 +6,7 @@
 //
 //
 
+import CoreFoundation // for CFByteOrderGetCurrent (Linux)
 import Foundation
 #if compiler(>=6.0) || (compiler(>=5.10) && hasFeature(AccessLevelOnImport))
 internal import FileIO
@@ -118,6 +119,15 @@ public class MachOFile: MachORepresentable {
     }
 }
 
+extension MachOFile {
+    public var endian: Endian {
+        let hostIsLittleEndian = CFByteOrderGetCurrent() == CFByteOrderLittleEndian.rawValue
+        return hostIsLittleEndian
+        ? (isSwapped ? .big : .little)
+        : (isSwapped ? .little : .big)
+    }
+}
+
 extension MachOFile {
     public var rpaths: [String] {
         loadCommands

Sources/MachOKit/MachOImage.swift

@@ -6,6 +6,7 @@
 //  
 //
 
+import CoreFoundation // for CFByteOrderGetCurrent (Linux)
 import Foundation
 
 /// Structure for `MachO` representation loaded from memory.
@@ -145,6 +146,19 @@ extension MachOImage {
     }
 }
 
+extension MachOImage {
+    public var endian: Endian {
+        switch CFByteOrderGetCurrent() {
+        case numericCast(CFByteOrderLittleEndian.rawValue):
+            return .little
+        case numericCast(CFByteOrderBigEndian.rawValue):
+            return .big
+        default:
+            fatalError("Unexpected byte order value: \(CFByteOrderGetCurrent())")
+        }
+    }
+}
+
 extension MachOImage {
     public var dependencies: [DependedDylib] {
         var dependencies = [DependedDylib]()

Sources/MachOKit/Model/Endian.swift

@@ -0,0 +1,12 @@
+//
+//  Endian.swift
+//  MachOKit
+//
+//  Created by p-x9 on 2025/07/09
+//  
+//
+
+public enum Endian {
+    case little
+    case big
+}

Sources/MachOKit/Protocol/MachORepresentable.swift

@@ -39,6 +39,9 @@ public protocol MachORepresentable {
     /// Sequence of load commands
     var loadCommands: LoadCommands { get }
 
+    /// Byte Order of this binary
+    var endian: Endian { get }
+
     /// List of runpaths
     var rpaths: [String] { get }
     /// List of depended dynamic libraries