Add ByteArray interface and provide internal and external implementations.

runtime/vm/raw_object.h

 // 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.
 
 #ifndef VM_RAW_OBJECT_H_
 #define VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 #include "vm/snapshot.h"
@@ skipping 41 matching lines @@
     V(String)                                                                  \
       V(OneByteString)                                                         \
       V(TwoByteString)                                                         \
       V(FourByteString)                                                        \
       V(ExternalOneByteString)                                                 \
       V(ExternalTwoByteString)                                                 \
       V(ExternalFourByteString)                                                \
     V(Bool)                                                                    \
     V(Array)                                                                   \
       V(ImmutableArray)                                                        \
-    V(ByteBuffer)                                                              \
+    V(ByteArray)                                                               \
+      V(InternalByteArray)                                                     \
+      V(ExternalByteArray)                                                     \
     V(Closure)                                                                 \
     V(Stacktrace)                                                              \
     V(JSRegExp)                                                                \
 
 #define CLASS_LIST(V)                                                          \
   V(Object)                                                                    \
   CLASS_LIST_NO_OBJECT(V)
 
 
 // Forward declarations.
@@ skipping 876 matching lines @@
 };
 
 
 class RawImmutableArray : public RawArray {
   RAW_HEAP_OBJECT_IMPLEMENTATION(ImmutableArray);
 
   friend class SnapshotReader;
 };
 
 
-class RawByteBuffer : public RawInstance {
-  RAW_HEAP_OBJECT_IMPLEMENTATION(ByteBuffer);
+class RawByteArray : public RawInstance {
+  RAW_HEAP_OBJECT_IMPLEMENTATION(ByteArray);
 
+ protected:
   RawObject** from() { return reinterpret_cast<RawObject**>(&ptr()->length_); }
   RawSmi* length_;
   RawObject** to() { return reinterpret_cast<RawObject**>(&ptr()->length_); }
+};
+
+
+class RawInternalByteArray : public RawByteArray {
+  RAW_HEAP_OBJECT_IMPLEMENTATION(InternalByteArray);
+
+  // Variable length data follows here.
+  uint8_t* data() {
+    uword address_of_length = reinterpret_cast<uword>(&length_);
+    return reinterpret_cast<uint8_t*>(address_of_length + kWordSize);
+  }
+};
+
+
+class RawExternalByteArray : public RawByteArray {
+  RAW_HEAP_OBJECT_IMPLEMENTATION(ExternalByteArray);
+
   uint8_t* data_;
 };
 
 
 class RawClosure : public RawInstance {
   RAW_HEAP_OBJECT_IMPLEMENTATION(Closure);
 
   RawObject** from() {
     return reinterpret_cast<RawObject**>(&ptr()->type_arguments_);
   }
@@ skipping 42 matching lines @@
   intptr_t type_;  // Uninitialized, simple or complex.
   intptr_t flags_;  // Represents global/local, case insensitive, multiline.
 
   // Variable length data follows here.
   uint8_t data_[0];
 };
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_