Add database recovery for FileSystemDirectoryDatabase.

webkit/fileapi/file_system_database_test_helper.cc

+// 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.
+
+#include "webkit/fileapi/file_system_database_test_helper.h"
+
+#include <algorithm>
+#include <functional>
+#include <vector>
+
+#include "base/file_util.h"
+#include "base/stl_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "webkit/fileapi/file_system_util.h"
+
+namespace fileapi {
+
+void CorruptDatabase(const FilePath& db_path,
+                     leveldb::FileType type,
+                     ptrdiff_t offset,
+                     size_t size) {
+  file_util::FileEnumerator file_enum(
+      db_path, false /* recursive */,
+      static_cast<file_util::FileEnumerator::FileType>(
+          file_util::FileEnumerator::DIRECTORIES |
+          file_util::FileEnumerator::FILES));
+  FilePath file_path;
+  FilePath picked_file_path;
+  uint64 picked_file_number = kuint64max;
+
+  while (!(file_path = file_enum.Next()).empty()) {
+    uint64 number = kuint64max;
+    leveldb::FileType file_type;
+    EXPECT_TRUE(leveldb::ParseFileName(FilePathToString(file_path.BaseName()),
+                                       &number, &file_type));
+    if (file_type == type &&
+        (picked_file_number == kuint64max || picked_file_number < number)) {
+      picked_file_path = file_path;
+      picked_file_number = number;
+    }
+  }
+
+  EXPECT_FALSE(picked_file_path.empty());
+  EXPECT_NE(kuint64max, picked_file_number);
+
+  bool created = true;
+  base::PlatformFileError error = base::PLATFORM_FILE_ERROR_FAILED;
+  base::PlatformFile file =
+      CreatePlatformFile(picked_file_path,
+                         base::PLATFORM_FILE_OPEN |
+                         base::PLATFORM_FILE_READ |
+                         base::PLATFORM_FILE_WRITE,
+                         &created, &error);
+  EXPECT_EQ(base::PLATFORM_FILE_OK, error);
+  EXPECT_FALSE(created);
+
+  base::PlatformFileInfo file_info;
+  EXPECT_TRUE(base::GetPlatformFileInfo(file, &file_info));
+  if (offset < 0)
+    offset += file_info.size;
+  EXPECT_GE(offset, 0);
+  EXPECT_LE(offset, file_info.size);
+
+  size = std::min(size, static_cast<size_t>(file_info.size - offset));
+
+  std::vector<char> buf(size);
+  int read_size = base::ReadPlatformFile(file, offset,
+                                         vector_as_array(&buf), buf.size());
+  EXPECT_LT(0, read_size);
+  EXPECT_GE(buf.size(), static_cast<size_t>(read_size));
+  buf.resize(read_size);
+
+  std::transform(buf.begin(), buf.end(), buf.begin(),
+                 std::logical_not<char>());
+
+  int written_size = base::WritePlatformFile(file, offset,
+                                             vector_as_array(&buf), buf.size());
+  EXPECT_GT(written_size, 0);
+  EXPECT_EQ(buf.size(), static_cast<size_t>(written_size));
+
+  base::ClosePlatformFile(file);
+}
+
+}  // namespace fileapi