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// 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_usage_cache.h"
#include "base/file_path.h"
#include "base/file_util.h"
#include "base/pickle.h"
namespace fileapi {
const base::FilePath::CharType FileSystemUsageCache::kUsageFileName[] =
FILE_PATH_LITERAL(".usage");
const char FileSystemUsageCache::kUsageFileHeader[] = "FSU5";
const int FileSystemUsageCache::kUsageFileHeaderSize = 4;
/* Pickle::{Read,Write}Bool treat bool as int */
const int FileSystemUsageCache::kUsageFileSize =
sizeof(Pickle::Header) +
FileSystemUsageCache::kUsageFileHeaderSize +
sizeof(int) + sizeof(int32) + sizeof(int64);
// static
int64 FileSystemUsageCache::GetUsage(const base::FilePath& usage_file_path) {
bool is_valid = true;
uint32 dirty = 0;
int64 fs_usage;
fs_usage = Read(usage_file_path, &is_valid, &dirty);
if (fs_usage < 0)
return -1;
return fs_usage;
}
// static
int32 FileSystemUsageCache::GetDirty(const base::FilePath& usage_file_path) {
bool is_valid = true;
uint32 dirty = 0;
int64 fs_usage;
fs_usage = Read(usage_file_path, &is_valid, &dirty);
if (fs_usage < 0)
return -1;
return static_cast<int32>(dirty);
}
// static
bool FileSystemUsageCache::IncrementDirty(const base::FilePath& usage_file_path) {
bool is_valid = true;
uint32 dirty = 0;
int64 fs_usage;
fs_usage = Read(usage_file_path, &is_valid, &dirty);
if (fs_usage < 0)
return false;
return Write(usage_file_path, is_valid, dirty + 1, fs_usage) >= 0;
}
// static
bool FileSystemUsageCache::DecrementDirty(const base::FilePath& usage_file_path) {
bool is_valid = true;
uint32 dirty = 0;
int64 fs_usage;
fs_usage = Read(usage_file_path, &is_valid, &dirty);
if (fs_usage < 0 || dirty <= 0)
return false;
return Write(usage_file_path, is_valid, dirty - 1, fs_usage) >= 0;
}
// static
bool FileSystemUsageCache::Invalidate(const base::FilePath& usage_file_path) {
bool is_valid = true;
uint32 dirty = 0;
int64 fs_usage;
fs_usage = Read(usage_file_path, &is_valid, &dirty);
return fs_usage >= 0 && Write(usage_file_path, false, dirty, fs_usage);
}
bool FileSystemUsageCache::IsValid(const base::FilePath& usage_file_path) {
bool is_valid = true;
uint32 dirty = 0;
int64 result = Read(usage_file_path, &is_valid, &dirty);
if (result < 0)
return false;
return is_valid;
}
// static
int FileSystemUsageCache::AtomicUpdateUsageByDelta(
const base::FilePath& usage_file_path, int64 delta) {
bool is_valid = true;
uint32 dirty = 0;
int64 fs_usage;
// TODO(dmikurube): Make sure that usage_file_path is available.
fs_usage = Read(usage_file_path, &is_valid, &dirty);
if (fs_usage < 0)
return -1;
return Write(usage_file_path, is_valid, dirty, fs_usage + delta);
}
// static
int FileSystemUsageCache::UpdateUsage(const base::FilePath& usage_file_path,
int64 fs_usage) {
return Write(usage_file_path, true, 0, fs_usage);
}
// static
bool FileSystemUsageCache::Exists(const base::FilePath& usage_file_path) {
return file_util::PathExists(usage_file_path);
}
// static
bool FileSystemUsageCache::Delete(const base::FilePath& usage_file_path) {
return file_util::Delete(usage_file_path, true);
}
// static
int64 FileSystemUsageCache::Read(const base::FilePath& usage_file_path,
bool* is_valid,
uint32* dirty) {
char buffer[kUsageFileSize];
const char *header;
if (usage_file_path.empty() ||
kUsageFileSize != file_util::ReadFile(usage_file_path,
buffer, kUsageFileSize))
return -1;
Pickle read_pickle(buffer, kUsageFileSize);
PickleIterator iter(read_pickle);
int64 fs_usage;
if (!read_pickle.ReadBytes(&iter, &header, kUsageFileHeaderSize) ||
!read_pickle.ReadBool(&iter, is_valid) ||
!read_pickle.ReadUInt32(&iter, dirty) ||
!read_pickle.ReadInt64(&iter, &fs_usage))
return -1;
if (header[0] != kUsageFileHeader[0] ||
header[1] != kUsageFileHeader[1] ||
header[2] != kUsageFileHeader[2] ||
header[3] != kUsageFileHeader[3])
return -1;
return fs_usage;
}
// static
int FileSystemUsageCache::Write(const base::FilePath& usage_file_path,
bool is_valid,
uint32 dirty,
int64 fs_usage) {
Pickle write_pickle;
write_pickle.WriteBytes(kUsageFileHeader, kUsageFileHeaderSize);
write_pickle.WriteBool(is_valid);
write_pickle.WriteUInt32(dirty);
write_pickle.WriteInt64(fs_usage);
base::FilePath temporary_usage_file_path;
if (usage_file_path.empty() ||
!file_util::CreateTemporaryFileInDir(usage_file_path.DirName(),
&temporary_usage_file_path)) {
return -1;
}
int bytes_written = file_util::WriteFile(temporary_usage_file_path,
(const char *)write_pickle.data(),
write_pickle.size());
if (bytes_written != kUsageFileSize)
return -1;
if (file_util::ReplaceFile(temporary_usage_file_path, usage_file_path))
return bytes_written;
else
return -1;
}
} // namespace fileapi
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