Merge pull request #690 from kareman/implement-FileHandle.nullDevice
diff --git a/Foundation/NSFileHandle.swift b/Foundation/NSFileHandle.swift
old mode 100644
new mode 100755
index 8596e66..dcc3e5d
--- a/Foundation/NSFileHandle.swift
+++ b/Foundation/NSFileHandle.swift
@@ -214,11 +214,49 @@
open class var standardError: FileHandle {
return _stderrFileHandle
}
-
+
+ internal static var _nulldeviceFileHandle: FileHandle = {
+ class NullDevice: FileHandle {
+ override var availableData: Data {
+ return Data()
+ }
+
+ override func readDataToEndOfFile() -> Data {
+ return Data()
+ }
+
+ override func readData(ofLength length: Int) -> Data {
+ return Data()
+ }
+
+ override func write(_ data: Data) {}
+
+ override var offsetInFile: UInt64 {
+ return 0
+ }
+
+ override func seekToEndOfFile() -> UInt64 {
+ return 0
+ }
+
+ override func seek(toFileOffset offset: UInt64) {}
+
+ override func truncateFile(atOffset offset: UInt64) {}
+
+ override func synchronizeFile() {}
+
+ override func closeFile() {}
+
+ deinit {}
+ }
+
+ return NullDevice(fileDescriptor: -1, closeOnDealloc: false)
+ }()
+
open class var nullDevice: FileHandle {
- NSUnimplemented()
+ return _nulldeviceFileHandle
}
-
+
public convenience init?(forReadingAtPath path: String) {
self.init(path: path, flags: O_RDONLY, createMode: 0)
}
diff --git a/TestFoundation/TestNSFileHandle.swift b/TestFoundation/TestNSFileHandle.swift
old mode 100644
new mode 100755
index 69a74cc..93357ff
--- a/TestFoundation/TestNSFileHandle.swift
+++ b/TestFoundation/TestNSFileHandle.swift
@@ -19,6 +19,7 @@
static var allTests : [(String, (TestNSFileHandle) -> () throws -> ())] {
return [
("test_pipe", test_pipe),
+ ("test_nullDevice", test_nullDevice),
]
}
@@ -38,4 +39,23 @@
XCTAssertEqual(output, input)
}
}
+
+ func test_nullDevice() {
+ let fh = FileHandle.nullDevice
+
+ XCTAssertEqual(fh.fileDescriptor, -1)
+ fh.closeFile()
+ fh.seek(toFileOffset: 10)
+ XCTAssertEqual(fh.offsetInFile, 0)
+ XCTAssertEqual(fh.seekToEndOfFile(), 0)
+ XCTAssertEqual(fh.readData(ofLength: 15).count, 0)
+ fh.synchronizeFile()
+
+ fh.write(Data(bytes: [1,2]))
+ fh.seek(toFileOffset: 0)
+ XCTAssertEqual(fh.availableData.count, 0)
+ fh.write(Data(bytes: [1,2]))
+ fh.seek(toFileOffset: 0)
+ XCTAssertEqual(fh.readDataToEndOfFile().count, 0)
+ }
}
