Draft of a PPAPI interface for ArrayBuffer and typed arrays.

ppapi/cpp/dev/var_array_buffer_dev.cc

+// Copyright (c) 2011 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/cpp/dev/var_array_buffer_dev.h"
+
+#include "ppapi/c/dev/ppb_var_array_buffer_dev.h"
+#include "ppapi/cpp/logging.h"
+#include "ppapi/cpp/module_impl.h"
+
+namespace pp {
+
+namespace {
+
+template <> const char* interface_name<PPB_VarArrayBuffer_Dev>() {
+  return PPB_VAR_ARRAY_BUFFER_DEV_INTERFACE;
+}
+
+}  // namespace
+
+VarArrayBuffer_Dev::VarArrayBuffer_Dev(const Var& var)
+    : Var(var), buffer_(NULL) {
+  if (var.is_array_buffer()) {
+    buffer_ = Map();
+  } else {
+    PP_NOTREACHED();
+    var_ = PP_MakeNull();
+  }
+}
+
+VarArrayBuffer_Dev::VarArrayBuffer_Dev(uint32_t size_in_bytes)
+    : buffer_(NULL) {
+  if (has_interface<PPB_VarArrayBuffer_Dev>()) {
+    var_ = get_interface<PPB_VarArrayBuffer_Dev>()->Create(size_in_bytes);
+    buffer_ = Map();
+  } else {
+    PP_NOTREACHED();
+    var_ = PP_MakeNull();
+  }
+}
+
+uint32_t VarArrayBuffer_Dev::ByteLength() const {
+  if (has_interface<PPB_VarArrayBuffer_Dev>()) {
+    return get_interface<PPB_VarArrayBuffer_Dev>()->ByteLength(var_);
+  }
+  PP_NOTREACHED();
+  return 0;
+}
+
+const void* VarArrayBuffer_Dev::Map() const {
+  return const_cast<VarArrayBuffer_Dev*>(this)->Map();
+}
+
+void* VarArrayBuffer_Dev::Map() {
+  // TODO(dmichael): This is not thread-safe.
+  if (buffer_)
+    return buffer_;
+  if (has_interface<PPB_VarArrayBuffer_Dev>()) {
+    buffer_ = get_interface<PPB_VarArrayBuffer_Dev>()->Map(var_);
+    return buffer_;
+  }
+  PP_NOTREACHED();
+  return 0;
+}
+
+}  // namespace pp