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#pragma once
#include "constants.h"
#include "exceptions.h"
#include "files.h"
#include "myutils.h"
#include "platform.h"
#include "streams.h"
#include <memory>
#include <string.h>
#include <unordered_map>
#include <utility>
namespace securefs
{
class FileTableIO;
class AutoClosedFileBase;
class FileTable
{
DISABLE_COPY_MOVE(FileTable)
private:
typedef std::unordered_map<id_type, std::unique_ptr<FileBase>, id_hash> table_type;
private:
static const int MAX_NUM_CLOSED = 101, NUM_EJECT = 8;
private:
key_type m_master_key;
table_type m_files;
std::vector<id_type> m_closed_ids;
std::unique_ptr<FileTableIO> m_fio;
uint32_t m_flags;
unsigned m_block_size, m_iv_size;
std::shared_ptr<const OSService> m_root;
private:
void eject();
void finalize(std::unique_ptr<FileBase>&);
public:
explicit FileTable(int version,
std::shared_ptr<const OSService> root,
const key_type& master_key,
uint32_t flags,
unsigned block_size,
unsigned iv_size);
~FileTable();
FileBase* open_as(const id_type& id, int type);
FileBase* create_as(const id_type& id, int type);
void close(FileBase*);
bool is_readonly() const noexcept { return (m_flags & kOptionReadOnly) != 0; }
bool is_auth_enabled() const noexcept { return (m_flags & kOptionNoAuthentication) == 0; }
bool is_time_stored() const noexcept { return (m_flags & kOptionStoreTime) != 0; }
void gc();
void statfs(struct fuse_statvfs* fs_info) { m_root->statfs(fs_info); }
};
class AutoClosedFileBase
{
private:
FileTable* m_ft;
FileBase* m_fb;
public:
explicit AutoClosedFileBase(FileTable* ft, FileBase* fb) : m_ft(ft), m_fb(fb) {}
AutoClosedFileBase(const AutoClosedFileBase&) = delete;
AutoClosedFileBase& operator=(const AutoClosedFileBase&) = delete;
AutoClosedFileBase(AutoClosedFileBase&& other) noexcept : m_ft(other.m_ft), m_fb(other.m_fb)
{
other.m_ft = nullptr;
other.m_fb = nullptr;
}
AutoClosedFileBase& operator=(AutoClosedFileBase&& other) noexcept
{
if (this == &other)
return *this;
swap(other);
return *this;
}
~AutoClosedFileBase()
{
try
{
reset(nullptr);
}
catch (...)
{
}
}
FileBase* get() noexcept { return m_fb; }
template <class T>
T* get_as() noexcept
{
return m_fb->cast_as<T>();
}
FileBase& operator*() noexcept { return *m_fb; }
FileBase* operator->() noexcept { return m_fb; }
FileBase* release() noexcept
{
auto rt = m_fb;
m_fb = nullptr;
return rt;
}
void reset(FileBase* fb)
{
if (m_ft && m_fb)
{
m_ft->close(m_fb);
}
m_fb = fb;
}
void swap(AutoClosedFileBase& other) noexcept
{
std::swap(m_ft, other.m_ft);
std::swap(m_fb, other.m_fb);
}
};
inline AutoClosedFileBase open_as(FileTable& table, const id_type& id, int type)
{
return AutoClosedFileBase(&table, table.open_as(id, type));
}
inline AutoClosedFileBase create_as(FileTable& table, const id_type& id, int type)
{
return AutoClosedFileBase(&table, table.create_as(id, type));
}
} // namespace securefs
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