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// Copyright 2015 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 SQL_MOJO_MOJO_VFS_H_
#define SQL_MOJO_MOJO_VFS_H_
#include "base/macros.h"
#include "components/filesystem/public/interfaces/directory.mojom.h"
typedef struct sqlite3_vfs sqlite3_vfs;
namespace sql {
// Changes the default sqlite3 vfs to a vfs that uses proxies calls to the
// mojo:filesystem service. Instantiating this object transparently changes how
// the entire //sql/ subsystem works in the process of the caller; all paths
// are treated as relative to |directory|.
class ScopedMojoFilesystemVFS {
public:
explicit ScopedMojoFilesystemVFS(filesystem::DirectoryPtr directory);
~ScopedMojoFilesystemVFS();
// Returns the directory of the current VFS.
filesystem::DirectoryPtr& GetDirectory();
private:
friend sqlite3_vfs* GetParentVFS(sqlite3_vfs* mojo_vfs);
friend filesystem::DirectoryPtr& GetRootDirectory(sqlite3_vfs* mojo_vfs);
// The default vfs at the time MojoVFS was installed. We use the to pass
// through things like randomness requests and per-platform sleep calls.
sqlite3_vfs* parent_;
// When we initialize the subsystem, we are given a filesystem::Directory
// object, which is the root directory of a mojo:filesystem. All access to
// various files are specified from this root directory.
filesystem::DirectoryPtr root_directory_;
DISALLOW_COPY_AND_ASSIGN(ScopedMojoFilesystemVFS);
};
} // namespace sql
#endif // SQL_MOJO_MOJO_VFS_H_
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