Atmosphere/libraries/libstratosphere/source/fssystem/fssystem_hierarchical_sha256_storage.hpp

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/*
* 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.hpp>
namespace ams::fssystem {
template<typename BaseStorageType>
class HierarchicalSha256Storage : public ::ams::fs::IStorage, public ::ams::fs::impl::Newable {
NON_COPYABLE(HierarchicalSha256Storage);
NON_MOVEABLE(HierarchicalSha256Storage);
public:
static constexpr s32 LayerCount = 3;
static constexpr size_t HashSize = crypto::Sha256Generator::HashSize;
private:
BaseStorageType m_base_storage;
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s64 m_base_storage_size;
char *m_hash_buffer;
size_t m_hash_buffer_size;
s32 m_hash_target_block_size;
s32 m_log_size_ratio;
fssystem::IHash256GeneratorFactory *m_hash_generator_factory;
os::SdkMutex m_mutex;
public:
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HierarchicalSha256Storage() : m_mutex() { /* ... */ }
Result Initialize(BaseStorageType *base_storages, s32 layer_count, size_t htbs, void *hash_buf, size_t hash_buf_size, fssystem::IHash256GeneratorFactory *hgf);
virtual Result Read(s64 offset, void *buffer, size_t size) override;
virtual Result Write(s64 offset, const void *buffer, size_t size) override;
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;
virtual Result GetSize(s64 *out) override {
R_RETURN(m_base_storage->GetSize(out));
}
virtual Result Flush() override {
R_RETURN(m_base_storage->Flush());
}
virtual Result SetSize(s64 size) override {
AMS_UNUSED(size);
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R_THROW(fs::ResultUnsupportedSetSizeForHierarchicalSha256Storage());
}
};
}