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52 lines
1.6 KiB
C++
52 lines
1.6 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_DISK_CACHE_SIMPLE_SIMPLE_VERSION_UPGRADE_H_
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#define NET_DISK_CACHE_SIMPLE_SIMPLE_VERSION_UPGRADE_H_
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// Defines functionality to upgrade the file structure of the Simple Cache
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// Backend on disk. Assumes no backend operations are running simultaneously.
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// Hence must be run at cache initialization step.
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#include <stdint.h>
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#include "net/base/cache_type.h"
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#include "net/base/net_export.h"
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namespace base {
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class FilePath;
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}
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namespace disk_cache {
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// Performs all necessary disk IO to upgrade the cache structure if it is
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// needed.
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//
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// Returns true iff no errors were found during consistency checks and all
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// necessary transitions succeeded. If this function fails, there is nothing
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// left to do other than dropping the whole cache directory.
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NET_EXPORT_PRIVATE bool UpgradeSimpleCacheOnDisk(const base::FilePath& path);
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struct NET_EXPORT_PRIVATE FakeIndexData {
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FakeIndexData();
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// Must be equal to simplecache_v4::kSimpleInitialMagicNumber.
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uint64_t initial_magic_number;
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// Must be equal kSimpleVersion when the cache backend is instantiated.
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uint32_t version;
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// These must be zero. The first was used for experiment type (With a max
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// valid value of 2), and the second was used for an experiment parameter.
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uint32_t zero;
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uint32_t zero2;
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};
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// Exposed for testing.
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NET_EXPORT_PRIVATE bool UpgradeIndexV5V6(const base::FilePath& cache_directory);
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} // namespace disk_cache
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#endif // NET_DISK_CACHE_SIMPLE_SIMPLE_VERSION_UPGRADE_H_
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