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// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "common/alignment.h"
#include "common/scope_exit.h"
#include "core/file_sys/fssystem/fssystem_hierarchical_sha256_storage.h"
namespace FileSys {
namespace {
s32 Log2(s32 value) {
ASSERT(value > 0);
ASSERT(Common::IsPowerOfTwo(value));
s32 log = 0;
while ((value >>= 1) > 0) {
++log;
}
return log;
}
} // namespace
Result HierarchicalSha256Storage::Initialize(VirtualFile* base_storages, s32 layer_count,
size_t htbs, void* hash_buf, size_t hash_buf_size) {
// Validate preconditions.
ASSERT(layer_count == LayerCount);
ASSERT(Common::IsPowerOfTwo(htbs));
ASSERT(hash_buf != nullptr);
// Set size tracking members.
m_hash_target_block_size = static_cast<s32>(htbs);
m_log_size_ratio = Log2(m_hash_target_block_size / HashSize);
// Get the base storage size.
m_base_storage_size = base_storages[2]->GetSize();
{
auto size_guard = SCOPE_GUARD({ m_base_storage_size = 0; });
R_UNLESS(m_base_storage_size <= static_cast<s64>(HashSize)
<< m_log_size_ratio << m_log_size_ratio,
ResultHierarchicalSha256BaseStorageTooLarge);
size_guard.Cancel();
}
// Set hash buffer tracking members.
m_base_storage = base_storages[2];
m_hash_buffer = static_cast<char*>(hash_buf);
m_hash_buffer_size = hash_buf_size;
// Read the master hash.
std::array<u8, HashSize> master_hash{};
base_storages[0]->ReadObject(std::addressof(master_hash));
// Read and validate the data being hashed.
s64 hash_storage_size = base_storages[1]->GetSize();
ASSERT(Common::IsAligned(hash_storage_size, HashSize));
ASSERT(hash_storage_size <= m_hash_target_block_size);
ASSERT(hash_storage_size <= static_cast<s64>(m_hash_buffer_size));
base_storages[1]->Read(reinterpret_cast<u8*>(m_hash_buffer),
static_cast<size_t>(hash_storage_size), 0);
R_SUCCEED();
}
size_t HierarchicalSha256Storage::Read(u8* buffer, size_t size, size_t offset) const {
// Succeed if zero-size.
if (size == 0) {
return size;
}
// Validate that we have a buffer to read into.
ASSERT(buffer != nullptr);
// Read the data.
return m_base_storage->Read(buffer, size, offset);
}
} // namespace FileSys
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