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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef SQL_SANDBOXED_VFS_FILE_H_
#define SQL_SANDBOXED_VFS_FILE_H_
#include "base/component_export.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/raw_ptr_exclusion.h"
#include "third_party/sqlite/sqlite3.h"
namespace sql {
// SQLite VFS file interface of an vfs file that works in a sandboxed process.
class COMPONENT_EXPORT(SQL) SandboxedVfsFile {
public:
SandboxedVfsFile();
virtual ~SandboxedVfsFile();
// Bind the `vfs_file` to an instance in the given sqlite3_file buffer.
static void BindSandboxedFile(SandboxedVfsFile* vfs_file,
sqlite3_file& buffer);
// Extracts the instance bridged to the given SQLite VFS file.
static SandboxedVfsFile& FromSqliteFile(sqlite3_file& sqlite_file);
// sqlite3_file implementation.
virtual int Close() = 0;
virtual int Read(void* buffer, int size, sqlite3_int64 offset) = 0;
virtual int Write(const void* buffer, int size, sqlite3_int64 offset) = 0;
virtual int Truncate(sqlite3_int64 size) = 0;
virtual int Sync(int flags) = 0;
virtual int FileSize(sqlite3_int64* result_size) = 0;
virtual int Lock(int mode) = 0;
virtual int Unlock(int mode) = 0;
virtual int CheckReservedLock(int* has_reserved_lock) = 0;
virtual int FileControl(int opcode, void* data) = 0;
virtual int SectorSize() = 0;
virtual int DeviceCharacteristics() = 0;
virtual int ShmMap(int page_index,
int page_size,
int extend_file_if_needed,
void volatile** result) = 0;
virtual int ShmLock(int offset, int size, int flags) = 0;
virtual void ShmBarrier() = 0;
virtual int ShmUnmap(int also_delete_file) = 0;
virtual int Fetch(sqlite3_int64 offset, int size, void** result) = 0;
virtual int Unfetch(sqlite3_int64 offset, void* fetch_result) = 0;
};
// sqlite3_file "subclass" that bridges to a SandboxedVfsFile instance.
struct SandboxedVfsFileSqliteBridge {
sqlite3_file sqlite_file;
// `sandboxed_vfs_file` is not a raw_ptr<SandboxedVfsFile>, because
// reinterpret_cast of uninitialized memory to raw_ptr can cause ref-counting
// mismatch.
RAW_PTR_EXCLUSION SandboxedVfsFile* sandboxed_vfs_file;
static SandboxedVfsFileSqliteBridge& FromSqliteFile(
sqlite3_file& sqlite_file);
};
} // namespace sql
#endif // SQL_SANDBOXED_VFS_FILE_H_
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