Merge pull request #190 from p-x9/feature/dyld-in-dyld-cache

Author: p-x9

Sources/MachOKit/DyldCache.swift

@@ -203,6 +203,17 @@ extension DyldCache {
 
         return AnySequence(machOFiles)
     }
+
+    public var dyld: MachOFile? {
+        guard let offset = fileOffset(of: mainCacheHeader.dyldInCacheMH) else {
+            return nil
+        }
+        return try? MachOFile(
+            url: url,
+            imagePath: "/usr/lib/dyld",
+            headerStartOffsetInCache: numericCast(offset)
+        )
+    }
 }
 
 extension DyldCache {

Sources/MachOKit/DyldCacheLoaded.swift

@@ -204,6 +204,15 @@ extension DyldCacheLoaded {
 
         return AnySequence(machOFiles)
     }
+
+    public var dyld: MachOImage? {
+        guard let slide,
+              let ptr = UnsafeRawPointer(bitPattern: Int(header.dyldInCacheMH) + slide) else {
+            return nil
+        }
+        
+        return .init(ptr: ptr.assumingMemoryBound(to: mach_header.self))
+    }
 }
 
 extension DyldCacheLoaded {

Tests/MachOKitTests/DyldCacheLoadedPrintTests.swift

@@ -156,6 +156,15 @@ final class DyldCacheLoadedPrintTests: XCTestCase {
         }
     }
 
+    func testDyld() throws {
+        guard let dyld = cache.dyld else { return }
+        let sourceVersion = dyld.loadCommands.info(of: LoadCommand.sourceVersion)!
+        print("Dyld:", dyld.path ?? "unknown", "dyld-\(sourceVersion.version)")
+        for cmd in dyld.loadCommands {
+            print(" -", cmd.type)
+        }
+    }
+
     func testDylibIndices() {
         let cache = cache!
         let indices = cache.dylibIndices

Tests/MachOKitTests/DyldCachePrintTests.swift

@@ -163,6 +163,15 @@ final class DyldCachePrintTests: XCTestCase {
         }
     }
 
+    func testDyld() throws {
+        guard let dyld = cache.dyld else { return }
+        let sourceVersion = dyld.loadCommands.info(of: LoadCommand.sourceVersion)!
+        print("Dyld:", dyld.imagePath, "dyld-\(sourceVersion.version)")
+        for cmd in dyld.loadCommands {
+            print(" -", cmd.type)
+        }
+    }
+
     func testDylibIndices() {
         let cache = self.cache1!
         let indices = cache.dylibIndices