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// Copyright (c) 2012 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 WEBKIT_FILEAPI_FILE_SYSTEM_USAGE_CACHE_H_
#define WEBKIT_FILEAPI_FILE_SYSTEM_USAGE_CACHE_H_
#include "base/basictypes.h"
#include "base/files/file_path.h"
#include "webkit/storage/webkit_storage_export.h"
namespace fileapi {
class WEBKIT_STORAGE_EXPORT_PRIVATE FileSystemUsageCache {
public:
// Gets the size described in the .usage file even if dirty > 0 or
// is_valid == false. Returns less than zero if the .usage file is not
// available.
static int64 GetUsage(const base::FilePath& usage_file_path);
// Gets the dirty count in the .usage file.
// Returns less than zero if the .usage file is not available.
static int32 GetDirty(const base::FilePath& usage_file_path);
// Increments or decrements the "dirty" entry in the .usage file.
// Returns false if no .usage is available.
static bool IncrementDirty(const base::FilePath& usage_file_path);
static bool DecrementDirty(const base::FilePath& usage_file_path);
// Notifies quota system that it needs to recalculate the usage cache of the
// origin. Returns false if no .usage is available.
static bool Invalidate(const base::FilePath& usage_file_path);
static bool IsValid(const base::FilePath& usage_file_path);
// Updates the size described in the .usage file.
static int UpdateUsage(const base::FilePath& usage_file_path, int64 fs_usage);
// Updates the size described in the .usage file by delta with keeping dirty
// even if dirty > 0.
static int AtomicUpdateUsageByDelta(
const base::FilePath& usage_file_path, int64 delta);
static bool Exists(const base::FilePath& usage_file_path);
static bool Delete(const base::FilePath& usage_file_path);
static const base::FilePath::CharType kUsageFileName[];
static const char kUsageFileHeader[];
static const int kUsageFileSize;
static const int kUsageFileHeaderSize;
private:
// Read the size, validity and the "dirty" entry described in the .usage file.
// Returns less than zero if no .usage file is available.
static int64 Read(const base::FilePath& usage_file_path,
bool* is_valid,
uint32* dirty);
static int Write(const base::FilePath& usage_file_path,
bool is_valid,
uint32 dirty,
int64 fs_usage);
};
} // namespace fileapi
#endif // WEBKIT_FILEAPI_FILE_SYSTEM_USAGE_CACHE_H_
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