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Atmosphere/libraries/libstratosphere/include/stratosphere/fs/fs_substorage.hpp
2020-12-05 03:15:48 -08:00

144 lines
6.5 KiB
C++

/*
* Copyright (c) 2018-2020 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 "impl/fs_newable.hpp"
#include "fs_istorage.hpp"
namespace ams::fs {
class SubStorage : public ::ams::fs::IStorage, public ::ams::fs::impl::Newable {
private:
std::shared_ptr<IStorage> shared_base_storage;
fs::IStorage *base_storage;
s64 offset;
s64 size;
bool resizable;
private:
constexpr bool IsValid() const {
return this->base_storage != nullptr;
}
public:
SubStorage() : shared_base_storage(), base_storage(nullptr), offset(0), size(0), resizable(false) { /* ... */ }
SubStorage(const SubStorage &rhs) : shared_base_storage(), base_storage(rhs.base_storage), offset(rhs.offset), size(rhs.size), resizable(rhs.resizable) { /* ... */}
SubStorage &operator=(const SubStorage &rhs) {
if (this != std::addressof(rhs)) {
this->base_storage = rhs.base_storage;
this->offset = rhs.offset;
this->size = rhs.size;
this->resizable = rhs.resizable;
}
return *this;
}
SubStorage(IStorage *storage, s64 o, s64 sz) : shared_base_storage(), base_storage(storage), offset(o), size(sz), resizable(false) {
AMS_ABORT_UNLESS(this->IsValid());
AMS_ABORT_UNLESS(this->offset >= 0);
AMS_ABORT_UNLESS(this->size >= 0);
}
SubStorage(std::shared_ptr<IStorage> storage, s64 o, s64 sz) : shared_base_storage(storage), base_storage(storage.get()), offset(o), size(sz), resizable(false) {
AMS_ABORT_UNLESS(this->IsValid());
AMS_ABORT_UNLESS(this->offset >= 0);
AMS_ABORT_UNLESS(this->size >= 0);
}
SubStorage(SubStorage *sub, s64 o, s64 sz) : shared_base_storage(), base_storage(sub->base_storage), offset(o + sub->offset), size(sz), resizable(false) {
AMS_ABORT_UNLESS(this->IsValid());
AMS_ABORT_UNLESS(this->offset >= 0);
AMS_ABORT_UNLESS(this->size >= 0);
AMS_ABORT_UNLESS(sub->size >= o + sz);
}
public:
void SetResizable(bool rsz) {
this->resizable = rsz;
}
public:
virtual Result Read(s64 offset, void *buffer, size_t size) override {
/* Ensure we're initialized. */
R_UNLESS(this->IsValid(), fs::ResultNotInitialized());
/* Succeed immediately on zero-sized operation. */
R_SUCCEED_IF(size == 0);
/* Validate arguments and read. */
R_UNLESS(buffer != nullptr, fs::ResultNullptrArgument());
R_UNLESS(IStorage::CheckAccessRange(offset, size, this->size), fs::ResultOutOfRange());
return this->base_storage->Read(this->offset + offset, buffer, size);
}
virtual Result Write(s64 offset, const void *buffer, size_t size) override{
/* Ensure we're initialized. */
R_UNLESS(this->IsValid(), fs::ResultNotInitialized());
/* Succeed immediately on zero-sized operation. */
R_SUCCEED_IF(size == 0);
/* Validate arguments and write. */
R_UNLESS(buffer != nullptr, fs::ResultNullptrArgument());
R_UNLESS(IStorage::CheckAccessRange(offset, size, this->size), fs::ResultOutOfRange());
return this->base_storage->Write(this->offset + offset, buffer, size);
}
virtual Result Flush() override {
R_UNLESS(this->IsValid(), fs::ResultNotInitialized());
return this->base_storage->Flush();
}
virtual Result SetSize(s64 size) override {
/* Ensure we're initialized and validate arguments. */
R_UNLESS(this->IsValid(), fs::ResultNotInitialized());
R_UNLESS(this->resizable, fs::ResultUnsupportedOperationInSubStorageA());
R_UNLESS(IStorage::CheckOffsetAndSize(this->offset, size), fs::ResultInvalidSize());
/* Ensure that we're allowed to set size. */
s64 cur_size;
R_TRY(this->base_storage->GetSize(std::addressof(cur_size)));
R_UNLESS(cur_size == this->offset + this->size, fs::ResultUnsupportedOperationInSubStorageB());
/* Set the size. */
R_TRY(this->base_storage->SetSize(this->offset + size));
this->size = size;
return ResultSuccess();
}
virtual Result GetSize(s64 *out) override {
/* Ensure we're initialized. */
R_UNLESS(this->IsValid(), fs::ResultNotInitialized());
*out = this->size;
return ResultSuccess();
}
virtual Result OperateRange(void *dst, size_t dst_size, OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) override {
/* Ensure we're initialized. */
R_UNLESS(this->IsValid(), fs::ResultNotInitialized());
/* Succeed immediately on zero-sized operation. */
R_SUCCEED_IF(size == 0);
/* Validate arguments and operate. */
R_UNLESS(IStorage::CheckOffsetAndSize(offset, size), fs::ResultOutOfRange());
return this->base_storage->OperateRange(dst, dst_size, op_id, this->offset + offset, size, src, src_size);
}
using IStorage::OperateRange;
};
}