[NaCl SDK] Expose Google Drive to nacl_io.

native_client_sdk/src/libraries/nacl_io/googledrivefs/googledrivefs_node.h

+// Copyright (c) 2016 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.
+
+#ifndef LIBRARIES_NACL_IO_GOOGLEDRIVEFS_NODE_H_
+#define LIBRARIES_NACL_IO_GOOGLEDRIVEFS_NODE_H_
+
+#include <time.h>
+#include <vector>
+
+#include "nacl_io/error.h"
+
+#include "nacl_io/filesystem.h"
+#include "nacl_io/kernel_handle.h"
+#include "nacl_io/path.h"
+
+namespace nacl_io {
+
+class GoogleDriveFsNode : public Node {
+ public:
+  GoogleDriveFsNode(Filesystem* filesystem, Path path);
+
+  Error GetDents(size_t offs, struct dirent* pdir, size_t size, int* out_bytes);
+  Error Write(const HandleAttr& attr,
+              const void* buf,
+              size_t count,
+              int* out_bytes);
+  Error FTruncate(off_t length);
+  Error Read(const HandleAttr& attr, void* buf, size_t count, int* out_bytes);
+  Error GetSize(off_t* out_size);
+  Error GetStat(struct stat* pstat);
+  Error Init(int open_flags);
+  void Destroy();
+
+ private:
+  Error ReadHelper(off_t start,
+                   off_t end,
+                   std::string* out_string_buffer,
+                   int* out_bytes);
+  Error WriteHelper(const char* body_data, uint32_t body_size);
+  Error GetModifiedTime(time_t* out_mtime);
+  Error CreateEmptyFile();
+  Error RequestDirentHelper(const std::string& url,
+                            std::vector<std::string>* out_dirent_names);
+  Error RequestDirentWithNextPageToken(
+      const std::string& next_page_token,
+      std::vector<std::string>* out_dirent_names);
+  Error RequestDirent(std::vector<std::string>* out_dirent_names);
+
+  std::string parent_dir_id_;
+  std::string item_id_;
+  Path path_;
+
+  friend class GoogleDriveFs;
+};
+
+}  // namespace nacl_io
+
+#endif  // LIBRARIES_NACL_IO_GOOGLEDRIVEFS_NODE_H_