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// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include "core/file_sys/fssystem/fssystem_indirect_storage.h"
namespace FileSys {
class SparseStorage : public IndirectStorage {
YUZU_NON_COPYABLE(SparseStorage);
YUZU_NON_MOVEABLE(SparseStorage);
private:
class ZeroStorage : public IReadOnlyStorage {
public:
ZeroStorage() {}
virtual ~ZeroStorage() {}
virtual size_t GetSize() const override {
return std::numeric_limits<size_t>::max();
}
virtual size_t Read(u8* buffer, size_t size, size_t offset) const override {
ASSERT(buffer != nullptr || size == 0);
if (size > 0) {
std::memset(buffer, 0, size);
}
return size;
}
};
public:
SparseStorage() : IndirectStorage(), m_zero_storage(std::make_shared<ZeroStorage>()) {}
virtual ~SparseStorage() {}
using IndirectStorage::Initialize;
void Initialize(s64 end_offset) {
this->GetEntryTable().Initialize(NodeSize, end_offset);
this->SetZeroStorage();
}
void SetDataStorage(VirtualFile storage) {
ASSERT(this->IsInitialized());
this->SetStorage(0, storage);
this->SetZeroStorage();
}
template <typename T>
void SetDataStorage(T storage, s64 offset, s64 size) {
ASSERT(this->IsInitialized());
this->SetStorage(0, storage, offset, size);
this->SetZeroStorage();
}
virtual size_t Read(u8* buffer, size_t size, size_t offset) const override;
private:
void SetZeroStorage() {
return this->SetStorage(1, m_zero_storage, 0, std::numeric_limits<s64>::max());
}
private:
VirtualFile m_zero_storage;
};
} // namespace FileSys
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