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// Copyright (c) 2006-2008 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 "base/file_util.h"
#include "net/disk_cache/block_files.h"
#include "net/disk_cache/disk_cache.h"
#include "net/disk_cache/disk_cache_test_base.h"
#include "net/disk_cache/disk_cache_test_util.h"
#include "testing/gtest/include/gtest/gtest.h"
using base::Time;
TEST_F(DiskCacheTest, BlockFiles_Grow) {
std::wstring path = GetCachePath();
ASSERT_TRUE(DeleteCache(path.c_str()));
ASSERT_TRUE(file_util::CreateDirectory(path));
disk_cache::BlockFiles files(path);
ASSERT_TRUE(files.Init(true));
// Fill up the 32-byte block file (use three files).
for (int i = 0; i < 35000; i++) {
disk_cache::Addr address(0);
EXPECT_TRUE(files.CreateBlock(disk_cache::RANKINGS, 4, &address));
}
}
// Handling of block files not properly closed.
TEST_F(DiskCacheTest, BlockFiles_Recover) {
std::wstring path = GetCachePath();
ASSERT_TRUE(DeleteCache(path.c_str()));
ASSERT_TRUE(file_util::CreateDirectory(path));
disk_cache::BlockFiles files(path);
ASSERT_TRUE(files.Init(true));
const int kNumEntries = 2000;
disk_cache::CacheAddr entries[kNumEntries];
int seed = static_cast<int>(Time::Now().ToInternalValue());
srand(seed);
for (int i = 0; i < kNumEntries; i++) {
disk_cache::Addr address(0);
int size = (rand() % 4) + 1;
EXPECT_TRUE(files.CreateBlock(disk_cache::RANKINGS, size, &address));
entries[i] = address.value();
}
for (int i = 0; i < kNumEntries; i++) {
int source1 = rand() % kNumEntries;
int source2 = rand() % kNumEntries;
disk_cache::CacheAddr temp = entries[source1];
entries[source1] = entries[source2];
entries[source2] = temp;
}
for (int i = 0; i < kNumEntries / 2; i++) {
disk_cache::Addr address(entries[i]);
files.DeleteBlock(address, false);
}
// At this point, there are kNumEntries / 2 entries on the file, randomly
// distributed both on location and size.
disk_cache::Addr address(entries[kNumEntries / 2]);
disk_cache::MappedFile* file = files.GetFile(address);
ASSERT_TRUE(NULL != file);
disk_cache::BlockFileHeader* header =
reinterpret_cast<disk_cache::BlockFileHeader*>(file->buffer());
ASSERT_TRUE(NULL != header);
ASSERT_EQ(0, header->updating);
int max_entries = header->max_entries;
int empty_1 = header->empty[0];
int empty_2 = header->empty[1];
int empty_3 = header->empty[2];
int empty_4 = header->empty[3];
// Corrupt the file.
header->max_entries = header->empty[0] = 0;
header->empty[1] = header->empty[2] = header->empty[3] = 0;
header->updating = -1;
files.CloseFiles();
ASSERT_TRUE(files.Init(false));
// The file must have been fixed.
file = files.GetFile(address);
ASSERT_TRUE(NULL != file);
header = reinterpret_cast<disk_cache::BlockFileHeader*>(file->buffer());
ASSERT_TRUE(NULL != header);
ASSERT_EQ(0, header->updating);
EXPECT_EQ(max_entries, header->max_entries);
EXPECT_EQ(empty_1, header->empty[0]);
EXPECT_EQ(empty_2, header->empty[1]);
EXPECT_EQ(empty_3, header->empty[2]);
EXPECT_EQ(empty_4, header->empty[3]);
}
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