Merge pull request #251 from p-x9/feature/use-mmap-fileio-protocol

Fix protocol constraints and perform mmap-based file I/O

Author: p-x9

Sources/MachOKit/Extension/_FileIOProtocol+.swift

@@ -238,6 +238,7 @@ extension _FileIOProtocol {
     }
 }
 
+#if false
 extension _FileIOProtocol {
     @_disfavoredOverload
     @inline(__always)
@@ -274,8 +275,38 @@ extension _FileIOProtocol {
         return String(cString: data)
     }
 }
+#endif
+
+extension MemoryMappedFileIOProtocol {
+    @inline(__always)
+    func readString(
+        offset: UInt64
+    ) -> String? {
+        String(
+            cString: ptr
+                .advanced(by: numericCast(offset))
+                .assumingMemoryBound(to: CChar.self)
+        )
+    }
+
+    @inline(__always)
+    func readString(
+        offset: UInt64,
+        size: Int // ignored
+    ) -> String? {
+        readString(offset: offset)
+    }
+
+    @inline(__always)
+    func readString(
+        offset: UInt64,
+        step: Int = 10 // ignored
+    ) -> String? {
+        readString(offset: offset)
+    }
+}
 
-extension MemoryMappedFile {
+extension MemoryMappedFile.FileSlice {
     @inline(__always)
     func readString(
         offset: UInt64

Sources/MachOKit/Model/DyldCache/DyldCacheMappingAndSlideInfo.swift

@@ -87,7 +87,7 @@ extension DyldCacheMappingAndSlideInfo {
 }
 
 extension DyldCacheMappingAndSlideInfo {
-    private func _slideInfo<File: FileIOProtocol>(
+    private func _slideInfo<File: MemoryMappedFileIOProtocol>(
         version: DyldCacheSlideInfo.Version,
         fileHandle: File
     ) -> DyldCacheSlideInfo? {

Sources/MachOKit/Protocol/_DyldCacheFileRepresentable.swift

@@ -17,7 +17,7 @@ internal protocol _DyldCacheFileRepresentable: DyldCacheRepresentable
 where DylibsTrie == DataTrieTree<DylibsTrieNodeContent>,
       ProgramsTrie == DataTrieTree<ProgramsTrieNodeContent>
 {
-    associatedtype File: FileIOProtocol
+    associatedtype File: MemoryMappedFileIOProtocol
     var fileHandle: File { get }
 
     func machOFiles() -> AnySequence<MachOFile>