Add FileIOTrusted class.

ppapi/cpp/trusted/file_io_trusted.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/trusted/file_io_trusted.h"
+
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/trusted/ppb_file_io_trusted.h"
+#include "ppapi/cpp/completion_callback.h"
+#include "ppapi/cpp/file_io.h"
+#include "ppapi/cpp/module_impl.h"
+
+namespace pp {
+
+namespace {
+
+template <> const char* interface_name<PPB_FileIOTrusted>() {
+  return PPB_FILEIOTRUSTED_INTERFACE_0_4;
+}
+
+}  // namespace
+
+FileIO_Trusted::FileIO_Trusted() {
+}
+
+int32_t FileIO_Trusted::GetOSFileDescriptor(const FileIO& file_io) {
+  const int32_t kInvalidOSFileDescriptor = -1;
+  if (!has_interface<PPB_FileIOTrusted>())
+    return kInvalidOSFileDescriptor;
+  return get_interface<PPB_FileIOTrusted>()->GetOSFileDescriptor(
+      file_io.pp_resource());
+}
+
+int32_t FileIO_Trusted::WillWrite(const FileIO& file_io,
+                                  int64_t offset,
+                                  int32_t bytes_to_write,
+                                  const CompletionCallback& callback) {
+  if (!has_interface<PPB_FileIOTrusted>())
+    return callback.MayForce(PP_ERROR_NOINTERFACE);
+  return get_interface<PPB_FileIOTrusted>()->WillWrite(
+      file_io.pp_resource(), offset, bytes_to_write,
+      callback.pp_completion_callback());
+}
+
+int32_t FileIO_Trusted::WillSetLength(const FileIO& file_io,
+                                      int64_t length,
+                                      const CompletionCallback& callback) {
+  if (!has_interface<PPB_FileIOTrusted>())
+    return callback.MayForce(PP_ERROR_NOINTERFACE);
+  return get_interface<PPB_FileIOTrusted>()->WillSetLength(
+      file_io.pp_resource(), length, callback.pp_completion_callback());
+}
+
+}  // namespace pp