Atmosphere/libraries/libstratosphere/include/stratosphere/fs/fs_istorage.hpp

112 lines
4.3 KiB
C++

/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stratosphere/fs/fs_common.hpp>
#include <stratosphere/fs/fs_file.hpp>
#include <stratosphere/fs/fs_operate_range.hpp>
namespace ams::fs {
class IStorage {
public:
virtual ~IStorage() { /* ... */ }
virtual Result Read(s64 offset, void *buffer, size_t size) = 0;
virtual Result Write(s64 offset, const void *buffer, size_t size) = 0;
virtual Result Flush() = 0;
virtual Result SetSize(s64 size) = 0;
virtual Result GetSize(s64 *out) = 0;
virtual Result OperateRange(void *dst, size_t dst_size, OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) = 0;
virtual Result OperateRange(OperationId op_id, s64 offset, s64 size) {
return this->OperateRange(nullptr, 0, op_id, offset, size, nullptr, 0);
}
public:
static inline bool CheckAccessRange(s64 offset, s64 size, s64 total_size) {
return offset >= 0 &&
size >= 0 &&
size <= total_size &&
offset <= (total_size - size);
}
static inline bool CheckAccessRange(s64 offset, size_t size, s64 total_size) {
return CheckAccessRange(offset, static_cast<s64>(size), total_size);
}
static inline bool CheckOffsetAndSize(s64 offset, s64 size) {
return offset >= 0 &&
size >= 0 &&
offset <= (offset + size);
}
static inline bool CheckOffsetAndSize(s64 offset, size_t size) {
return CheckOffsetAndSize(offset, static_cast<s64>(size));
}
};
class ReadOnlyStorageAdapter : public IStorage {
private:
std::shared_ptr<IStorage> m_shared_storage;
std::unique_ptr<IStorage> m_unique_storage;
IStorage *m_storage;
public:
explicit ReadOnlyStorageAdapter(IStorage *s) : m_unique_storage(s) {
m_storage = m_unique_storage.get();
}
explicit ReadOnlyStorageAdapter(std::shared_ptr<IStorage> s) : m_shared_storage(s) {
m_storage = m_shared_storage.get();
}
explicit ReadOnlyStorageAdapter(std::unique_ptr<IStorage> s) : m_unique_storage(std::move(s)) {
m_storage = m_unique_storage.get();
}
virtual ~ReadOnlyStorageAdapter() { /* ... */ }
public:
virtual Result Read(s64 offset, void *buffer, size_t size) override {
return m_storage->Read(offset, buffer, size);
}
virtual Result Flush() override {
return m_storage->Flush();
}
virtual Result GetSize(s64 *out) override {
return m_storage->GetSize(out);
}
virtual Result OperateRange(void *dst, size_t dst_size, OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) override {
return m_storage->OperateRange(dst, dst_size, op_id, offset, size, src, src_size);
}
virtual Result Write(s64 offset, const void *buffer, size_t size) override {
/* TODO: Better result? Is it possible to get a more specific one? */
AMS_UNUSED(offset, buffer, size);
return fs::ResultUnsupportedOperation();
}
virtual Result SetSize(s64 size) override {
/* TODO: Better result? Is it possible to get a more specific one? */
AMS_UNUSED(size);
return fs::ResultUnsupportedOperation();
}
};
}