Add PPB_VarArray_Dev support - part 1.

ppapi/shared_impl/array_var.cc

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ppapi/shared_impl/array_var.h"
+
+#include <limits>
+
+#include "base/logging.h"
+#include "base/memory/ref_counted.h"
+#include "ppapi/shared_impl/ppapi_globals.h"
+#include "ppapi/shared_impl/var_tracker.h"
+
+namespace ppapi {
+
+ArrayVar::ArrayVar() {
+}
+
+ArrayVar::~ArrayVar() {
+}
+
+// static
+ArrayVar* ArrayVar::FromPPVar(const PP_Var& var) {
+  if (var.type != PP_VARTYPE_ARRAY)
+    return NULL;
+
+  scoped_refptr<Var> var_object(
+      PpapiGlobals::Get()->GetVarTracker()->GetVar(var));
+  if (!var_object.get())
+    return NULL;
+  return var_object->AsArrayVar();
+}
+
+ArrayVar* ArrayVar::AsArrayVar() {
+  return this;
+}
+
+PP_VarType ArrayVar::GetType() const {
+  return PP_VARTYPE_ARRAY;
+}
+
+PP_Var ArrayVar::Get(uint32_t index) const {
+  if (index >= elements_.size())
+    return PP_MakeUndefined();
+
+  const PP_Var& element = elements_[index].get();
+  PpapiGlobals::Get()->GetVarTracker()->AddRefVar(element);
+  return element;
+}
+
+PP_Bool ArrayVar::Set(uint32_t index, const PP_Var& value) {
+  if (index >= elements_.size()) {
+    // Insert ScopedPPVars of type PP_VARTYPE_UNDEFINED to reach the new size
+    // (index + 1).
+    elements_.resize(index + 1);
+  }
+
+  elements_[index] = value;
+  return PP_TRUE;
+}
+
+uint32_t ArrayVar::GetLength() const {
+  if (elements_.size() > std::numeric_limits<uint32_t>::max()) {

[raymes, 2013/03/05 18:19:16]

This is being very careful :) I was wondering whether it makes more sense to
have this before a resize operation...but I think it's fine here.

[yzshen1, 2013/03/14 22:36:48]

Done. :)

+    CHECK(false);
+    return 0;
+  }
+
+  return static_cast<uint32_t>(elements_.size());
+}
+
+PP_Bool ArrayVar::SetLength(uint32_t length) {
+  // If |length| is larger than the current size, ScopedPPVars of type
+  // PP_VARTYPE_UNDEFINED will be inserted to reach the new length.
+  elements_.resize(length);
+  return PP_TRUE;
+}
+
+}  // namespace ppapi