New APIs for external byte arrays

runtime/vm/dart_api_impl.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 "include/dart_api.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart.h"
@@ skipping 1592 matching lines @@
                                                    void** peer) {
   if (peer == NULL) {
     RETURN_NULL_ERROR(peer);
   }
 
   if (Api::ExternalStringGetPeerHelper(object, peer)) {
     return Api::Success(Isolate::Current());
   }
 
   // It's not an external string, return appropriate error.
-  // Note: this is invoked outside of the NoGCScope'd block above, since
-  // error messages allocate new handles.
   if (!RawObject::IsStringClassId(Api::ClassId(object))) {
     RETURN_TYPE_ERROR(Isolate::Current(), object, String);
   } else {
     return
         Api::NewError(
             "%s expects argument 'object' to be an external String.",
             CURRENT_FUNC);
   }
 }
 
@@ skipping 539 matching lines @@
 
 
 // --- Byte Arrays ---
 
 
 DART_EXPORT bool Dart_IsByteArray(Dart_Handle object) {
   return RawObject::IsByteArrayClassId(Api::ClassId(object));
 }
 
 
+DART_EXPORT bool Dart_IsByteArrayExternal(Dart_Handle object) {
+  return RawObject::IsExternalByteArrayClassId(Api::ClassId(object));
+}
+
+
 DART_EXPORT Dart_Handle Dart_NewByteArray(intptr_t length) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   CHECK_LENGTH(length, Uint8Array::kMaxElements);
   return Api::NewHandle(isolate, Uint8Array::New(length));
 }
 
 
 DART_EXPORT Dart_Handle Dart_NewExternalByteArray(uint8_t* data,
                                                   intptr_t length,
                                                   void* peer,
                                                   Dart_PeerFinalizer callback) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   if (data == NULL && length != 0) {
     RETURN_NULL_ERROR(data);
   }
   CHECK_LENGTH(length, ExternalUint8Array::kMaxElements);
   return Api::NewHandle(
       isolate, ExternalUint8Array::New(data, length, peer, callback));
 }
 
 
+DART_EXPORT Dart_Handle Dart_ExternalByteArrayGetData(Dart_Handle object,
+                                                      void** data) {
+  Isolate* isolate = Isolate::Current();
+  DARTSCOPE(isolate);
+  const ExternalUint8Array& array =
+      Api::UnwrapExternalUint8ArrayHandle(isolate, object);
+  if (array.IsNull()) {
+    RETURN_TYPE_ERROR(isolate, object, ExternalUint8Array);
+  }
+  if (data == NULL) {
+    RETURN_NULL_ERROR(data);
+  }
+  *data = array.GetData();
+  return Api::Success(isolate);
+}
+
+
 DART_EXPORT Dart_Handle Dart_ExternalByteArrayGetPeer(Dart_Handle object,
                                                       void** peer) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   const ExternalUint8Array& array =
       Api::UnwrapExternalUint8ArrayHandle(isolate, object);
   if (array.IsNull()) {
     RETURN_TYPE_ERROR(isolate, object, ExternalUint8Array);
   }
   if (peer == NULL) {
@@ skipping 2330 matching lines @@
   }
   {
     NoGCScope no_gc;
     RawObject* raw_obj = obj.raw();
     isolate->heap()->SetPeer(raw_obj, peer);
   }
   return Api::Success(isolate);
 }
 
 }  // namespace dart