THRIFT-3773: Swift 3 changes, Squashed (#1084)

Client: swift
diff --git a/lib/swift/Sources/TFileTransport.swift b/lib/swift/Sources/TFileTransport.swift
new file mode 100644
index 0000000..fe2253d
--- /dev/null
+++ b/lib/swift/Sources/TFileTransport.swift
@@ -0,0 +1,101 @@
+/*
+* Licensed to the Apache Software Foundation (ASF) under one
+* or more contributor license agreements. See the NOTICE file
+* distributed with this work for additional information
+* regarding copyright ownership. The ASF licenses this file
+* to you 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
+*
+*   http://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.
+*/
+
+import Foundation
+
+#if os(OSX) || os(iOS) || os(watchOS) || os(tvOS)
+  import Darwin
+#elseif os(Linux) || os(FreeBSD) || os(PS4) || os(Android)
+  import Glibc
+#endif
+
+/// TFileTransport
+/// Foundation-less Swift File transport.
+/// Uses C fopen/fread/fwrite,
+/// provided by Glibc in linux and Darwin on OSX/iOS
+public class TFileTransport: TTransport {
+  var fileHandle: UnsafeMutablePointer<FILE>? = nil
+  
+  public init (fileHandle: UnsafeMutablePointer<FILE>) {
+    self.fileHandle = fileHandle
+  }
+
+  public convenience init(filename: String) throws {
+    var fileHandle: UnsafeMutablePointer<FILE>?
+    filename.withCString({ cFilename in
+      "rw".withCString({ cMode in
+        fileHandle = fopen(cFilename, cMode)
+      })
+    })
+    if let fileHandle = fileHandle {
+      self.init(fileHandle: fileHandle)
+    } else {
+      throw TTransportError(error: .notOpen)
+    }
+  }
+  
+  deinit {
+    fclose(self.fileHandle)
+  }
+  
+  public func readAll(size: Int) throws -> Data {
+    let read = try self.read(size: size)
+    
+    if read.count != size {
+      throw TTransportError(error: .endOfFile)
+    }
+    return read
+  }
+  
+  public func read(size: Int) throws -> Data {
+    // set up read buffer, position 0
+    var read = Data(capacity: size)
+    var position = 0
+    
+    // read character buffer
+    var nextChar: UInt8 = 0
+    
+    // continue until we've read size bytes
+    while read.count < size {
+      if fread(&nextChar, 1, 1, self.fileHandle) == 1 {
+        read[position] = nextChar
+
+        // Increment output byte pointer
+        position += 1
+        
+      } else {
+        throw TTransportError(error: .endOfFile)
+      }
+    }
+    return read
+  }
+  
+  public func write(data: Data) throws {
+    let bytesWritten = data.withUnsafeBytes {
+      fwrite($0, 1, data.count, self.fileHandle)
+    }
+    if bytesWritten != data.count {
+      throw TTransportError(error: .unknown)
+    }
+  }
+  
+  public func flush() throws {
+    return
+  }
+}