mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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111 lines
4.2 KiB
C++
111 lines
4.2 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "fs_common.hpp"
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#include "fs_file.hpp"
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#include "fs_operate_range.hpp"
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namespace ams::fs {
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class IStorage {
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public:
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virtual ~IStorage() { /* ... */ }
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virtual Result Read(s64 offset, void *buffer, size_t size) = 0;
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virtual Result Write(s64 offset, const void *buffer, size_t size) = 0;
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virtual Result Flush() = 0;
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virtual Result SetSize(s64 size) = 0;
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virtual Result GetSize(s64 *out) = 0;
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virtual Result OperateRange(void *dst, size_t dst_size, OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) = 0;
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virtual Result OperateRange(OperationId op_id, s64 offset, s64 size) {
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return this->OperateRange(nullptr, 0, op_id, offset, size, nullptr, 0);
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}
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public:
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static inline bool CheckAccessRange(s64 offset, s64 size, s64 total_size) {
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return offset >= 0 &&
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size >= 0 &&
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size <= total_size &&
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offset <= (total_size - size);
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}
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static inline bool CheckAccessRange(s64 offset, size_t size, s64 total_size) {
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return CheckAccessRange(offset, static_cast<s64>(size), total_size);
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}
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static inline bool CheckOffsetAndSize(s64 offset, s64 size) {
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return offset >= 0 &&
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size >= 0 &&
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offset <= (offset + size);
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}
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static inline bool CheckOffsetAndSize(s64 offset, size_t size) {
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return CheckOffsetAndSize(offset, static_cast<s64>(size));
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}
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};
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class ReadOnlyStorageAdapter : public IStorage {
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private:
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std::shared_ptr<IStorage> shared_storage;
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std::unique_ptr<IStorage> unique_storage;
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IStorage *storage;
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public:
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ReadOnlyStorageAdapter(IStorage *s) : unique_storage(s) {
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this->storage = this->unique_storage.get();
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}
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ReadOnlyStorageAdapter(std::shared_ptr<IStorage> s) : shared_storage(s) {
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this->storage = this->shared_storage.get();
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}
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ReadOnlyStorageAdapter(std::unique_ptr<IStorage> s) : unique_storage(std::move(s)) {
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this->storage = this->unique_storage.get();
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}
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virtual ~ReadOnlyStorageAdapter() { /* ... */ }
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public:
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virtual Result Read(s64 offset, void *buffer, size_t size) override {
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return this->storage->Read(offset, buffer, size);
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}
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virtual Result Flush() override {
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return this->storage->Flush();
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}
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virtual Result GetSize(s64 *out) override {
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return this->storage->GetSize(out);
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}
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virtual Result OperateRange(void *dst, size_t dst_size, OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) override {
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return this->storage->OperateRange(dst, dst_size, op_id, offset, size, src, src_size);
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}
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virtual Result Write(s64 offset, const void *buffer, size_t size) override {
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/* TODO: Better result? Is it possible to get a more specific one? */
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return fs::ResultUnsupportedOperation();
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}
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virtual Result SetSize(s64 size) override {
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/* TODO: Better result? Is it possible to get a more specific one? */
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return fs::ResultUnsupportedOperation();
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}
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};
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}
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