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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "sync/test/directory_backing_store_corruption_testing.h" | |
6 | |
7 #include <string> | |
8 | |
9 #include "base/files/file_util.h" | |
10 #include "base/files/scoped_file.h" | |
11 | |
12 namespace syncer { | |
13 namespace syncable { | |
14 namespace corruption_testing { | |
15 | |
16 // This value needs to be large enough to force the underlying DB to be read | |
17 // from disk before writing, but small enough so that tests don't take too long | |
18 // and timeout. The value depend on the underlying DB page size as well as the | |
19 // DB's cache_size PRAGMA. If test fails, you either increase | |
20 // kNumEntriesRequiredForCorruption, or increase the size of each entry. | |
21 const int kNumEntriesRequiredForCorruption = 2000; | |
22 | |
23 bool CorruptDatabase(const base::FilePath& backing_file_path) { | |
24 // Corrupt the DB by write a bunch of zeros at the beginning. | |
25 // | |
26 // Because the file may already open for writing, it's important that we open | |
27 // it in a sharing-compatible way for platforms that have the concept of | |
28 // shared/exclusive file access (e.g. Windows). | |
29 base::ScopedFILE db_file(base::OpenFile(backing_file_path, "wb")); | |
30 if (!db_file.get()) | |
31 return false; | |
32 const std::string zeros(4096, '\0'); | |
33 const int num_written = fwrite(zeros.data(), zeros.size(), 1, db_file.get()); | |
34 return num_written == 1U; | |
35 } | |
36 | |
37 } // namespace corruption_testing | |
38 } // namespace syncable | |
39 } // namespace syncer | |
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