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// Copyright 2013 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 NET_DISK_CACHE_SIMPLE_SIMPLE_VERSION_UPGRADE_H_
#define NET_DISK_CACHE_SIMPLE_SIMPLE_VERSION_UPGRADE_H_
// Defines functionality to upgrade the file structure of the Simple Cache
// Backend on disk. Assumes no backend operations are running simultaneously.
// Hence must be run at cache initialization step.
#include <stdint.h>
#include "net/base/net_export.h"
namespace base {
class FilePath;
}
namespace disk_cache {
// Performs all necessary disk IO to upgrade the cache structure if it is
// needed.
//
// Returns true iff no errors were found during consistency checks and all
// necessary transitions succeeded. If this function fails, there is nothing
// left to do other than dropping the whole cache directory.
NET_EXPORT_PRIVATE bool UpgradeSimpleCacheOnDisk(const base::FilePath& path);
// The format for the fake index has mistakenly acquired two extra fields that
// do not contain any useful data. Since they were equal to zero, they are now
// mandatated to be zero.
struct NET_EXPORT_PRIVATE FakeIndexData {
FakeIndexData();
// Must be equal to simplecache_v4::kSimpleInitialMagicNumber.
uint64_t initial_magic_number;
// Must be equal kSimpleVersion when the cache backend is instantiated.
uint32_t version;
uint32_t unused_must_be_zero1;
uint32_t unused_must_be_zero2;
};
// Exposed for testing.
NET_EXPORT_PRIVATE bool UpgradeIndexV5V6(const base::FilePath& cache_directory);
} // namespace disk_cache
#endif // NET_DISK_CACHE_SIMPLE_SIMPLE_VERSION_UPGRADE_H_