mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-11-16 01:49:32 +00:00
102 lines
3.7 KiB
C++
102 lines
3.7 KiB
C++
/*
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* Copyright (c) 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 <vapours.hpp>
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#include <stratosphere/fssystem/fssystem_indirect_storage.hpp>
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namespace ams::fssystem {
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class SparseStorage : public IndirectStorage {
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NON_COPYABLE(SparseStorage);
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NON_MOVEABLE(SparseStorage);
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private:
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class ZeroStorage : public ::ams::fs::IStorage, public ::ams::fs::impl::Newable {
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public:
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ZeroStorage() { /* ... */ }
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virtual ~ZeroStorage() { /* ... */ }
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virtual Result Read(s64 offset, void *buffer, size_t size) override {
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AMS_ASSERT(offset >= 0);
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AMS_ASSERT(buffer != nullptr || size == 0);
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AMS_UNUSED(offset);
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if (size > 0) {
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std::memset(buffer, 0, size);
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}
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R_SUCCEED();
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}
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virtual Result OperateRange(void *dst, size_t dst_size, fs::OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) override {
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AMS_UNUSED(dst, dst_size, op_id, offset, size, src, src_size);
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R_SUCCEED();
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}
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virtual Result GetSize(s64 *out) override {
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AMS_ASSERT(out != nullptr);
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*out = std::numeric_limits<s64>::max();
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R_SUCCEED();
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}
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virtual Result Flush() override {
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R_SUCCEED();
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}
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virtual Result Write(s64 offset, const void *buffer, size_t size) override {
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AMS_UNUSED(offset, buffer, size);
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R_THROW(fs::ResultUnsupportedWriteForZeroStorage());
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}
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virtual Result SetSize(s64 size) override {
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AMS_UNUSED(size);
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R_THROW(fs::ResultUnsupportedSetSizeForZeroStorage());
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}
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};
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private:
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ZeroStorage m_zero_storage;
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public:
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SparseStorage() : IndirectStorage(), m_zero_storage() { /* ... */ }
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virtual ~SparseStorage() { /* ... */ }
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using IndirectStorage::Initialize;
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void Initialize(s64 end_offset) {
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this->GetEntryTable().Initialize(NodeSize, end_offset);
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this->SetZeroStorage();
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}
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void SetDataStorage(fs::SubStorage storage) {
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AMS_ASSERT(this->IsInitialized());
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this->SetStorage(0, storage);
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this->SetZeroStorage();
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}
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template<typename T>
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void SetDataStorage(T storage, s64 offset, s64 size) {
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AMS_ASSERT(this->IsInitialized());
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this->SetStorage(0, storage, offset, size);
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this->SetZeroStorage();
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}
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virtual Result Read(s64 offset, void *buffer, size_t size) override;
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private:
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void SetZeroStorage() {
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return this->SetStorage(1, std::addressof(m_zero_storage), 0, std::numeric_limits<s64>::max());
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}
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};
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}
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