Start adding TLS (SSL) sockets to dart:io.

runtime/bin/tls_socket_macos.cc

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#include "bin/tls_socket.h"
+
+#include "bin/builtin.h"
+
+
+class TlsFilterPlatformData {
+};
+
+
+TlsFilter::TlsFilter() : in_handshake_(false) {
+  LockInitMutex();
+  if (!library_initialized_) {
+    InitializeLibrary();
+    library_initialized_ = true;
+  }
+  UnlockInitMutex();
+}
+
+
+void TlsFilter::InitializePlatformData() {
+  UNIMPLEMENTED();
+}
+
+
+void TlsFilter::InitializeLibrary() {
+  UNIMPLEMENTED();
+}
+
+
+void TlsFilter::Connect() {
+  UNIMPLEMENTED();
+}
+
+
+void TlsFilter::Destroy() {
+  UNIMPLEMENTED();
+}
+
+
+intptr_t TlsFilter::ProcessBuffer(int buffer_index) {
+  Dart_Handle buffer_object = dart_buffer_objects_[buffer_index];
+  Dart_Handle start_object = HandleError(
+      Dart_GetField(buffer_object, stringStart_));
+  Dart_Handle length_object = HandleError(
+      Dart_GetField(buffer_object, stringLength_));
+  int64_t unsafe_start = DartUtils::GetIntegerValue(start_object);
+  int64_t unsafe_length = DartUtils::GetIntegerValue(length_object);
+  if (unsafe_start < 0 || unsafe_start >= buffer_size_ ||
+      unsafe_length < 0 || unsafe_length > buffer_size_) {
+     Dart_ThrowException(DartUtils::NewDartIllegalArgumentException(
+         "Illegal .start or .length on a _TlsExternalBuffer"));
+  }
+  intptr_t start = static_cast<intptr_t>(unsafe_start);
+  intptr_t length = static_cast<intptr_t>(unsafe_length);
+
+  intptr_t bytes_processed = 0;
+  switch (buffer_index) {
+    case kReadPlaintext:
+    case kWriteEncrypted:
+      // Write from the filter to the buffer.
+      USE(start);
+      UNIMPLEMENTED();
+      break;
+    case kReadEncrypted:
+    case kWritePlaintext:
+      if (length > 0) {
+        // Write from the buffer to the filter.
+        UNIMPLEMENTED();
+      }
+      break;
+  }
+  return bytes_processed;
+}