Allows adding trusted certs on iOS.

runtime/bin/secure_socket_macos.h

 // Copyright (c) 2016, 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.
 
 #ifndef BIN_SECURE_SOCKET_MACOS_H_
 #define BIN_SECURE_SOCKET_MACOS_H_
 
 #if !defined(BIN_SECURE_SOCKET_H_)
 #error Do not include secure_socket_macos.h directly. Use secure_socket.h.
 #endif
@@ skipping 125 matching lines @@
   Dart_PersistentHandle bad_certificate_callback_;
   bool in_handshake_;
   bool connected_;
   bool bad_cert_;
   bool is_server_;
   char* hostname_;
 
   DISALLOW_COPY_AND_ASSIGN(SSLFilter);
 };
 
+// Where the argument to the constructor is the handle for an object
+// implementing List<int>, this class creates a scope in which the memory
+// backing the list can be accessed.
+//
+// Do not make Dart_ API calls while in a ScopedMemBuffer.
+// Do not call Dart_PropagateError while in a ScopedMemBuffer.
+class ScopedMemBuffer {
+ public:
+  explicit ScopedMemBuffer(Dart_Handle object) {
+    if (!Dart_IsTypedData(object) && !Dart_IsList(object)) {
+      Dart_ThrowException(DartUtils::NewDartArgumentError(
+          "Argument is not a List<int>"));
+    }
+
+    uint8_t* bytes = NULL;
+    intptr_t bytes_len = 0;
+    bool is_typed_data = false;
+    if (Dart_IsTypedData(object)) {
+      is_typed_data = true;
+      Dart_TypedData_Type typ;
+      ThrowIfError(Dart_TypedDataAcquireData(
+          object,
+          &typ,
+          reinterpret_cast<void**>(&bytes),
+          &bytes_len));
+    } else {
+      ASSERT(Dart_IsList(object));
+      ThrowIfError(Dart_ListLength(object, &bytes_len));
+      bytes = Dart_ScopeAllocate(bytes_len);
+      ASSERT(bytes != NULL);
+      ThrowIfError(Dart_ListGetAsBytes(object, 0, bytes, bytes_len));
+    }
+
+    object_ = object;
+    bytes_ = bytes;
+    bytes_len_ = bytes_len;
+    is_typed_data_ = is_typed_data;
+  }
+
+  ~ScopedMemBuffer() {
+    if (is_typed_data_) {
+      ThrowIfError(Dart_TypedDataReleaseData(object_));
+    }
+  }
+
+  uint8_t* get() const { return bytes_; }
+  intptr_t length() const { return bytes_len_; }
+
+ private:
+  Dart_Handle object_;
+  uint8_t* bytes_;
+  intptr_t bytes_len_;
+  bool is_typed_data_;
+
+  DISALLOW_ALLOCATION();
+  DISALLOW_COPY_AND_ASSIGN(ScopedMemBuffer);
+};
+
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_SECURE_SOCKET_MACOS_H_