1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "common/alignment.h"
#include "core/file_sys/fssystem/fssystem_integrity_verification_storage.h"
namespace FileSys {
constexpr inline u32 ILog2(u32 val) {
ASSERT(val > 0);
return ((sizeof(u32) * 8) - 1 - std::countl_zero<u32>(val));
}
void IntegrityVerificationStorage::Initialize(VirtualFile hs, VirtualFile ds, s64 verif_block_size,
s64 upper_layer_verif_block_size, bool is_real_data) {
// Validate preconditions.
ASSERT(verif_block_size >= HashSize);
// Set storages.
m_hash_storage = hs;
m_data_storage = ds;
// Set verification block sizes.
m_verification_block_size = verif_block_size;
m_verification_block_order = ILog2(static_cast<u32>(verif_block_size));
ASSERT(m_verification_block_size == 1ll << m_verification_block_order);
// Set upper layer block sizes.
upper_layer_verif_block_size = std::max(upper_layer_verif_block_size, HashSize);
m_upper_layer_verification_block_size = upper_layer_verif_block_size;
m_upper_layer_verification_block_order = ILog2(static_cast<u32>(upper_layer_verif_block_size));
ASSERT(m_upper_layer_verification_block_size == 1ll << m_upper_layer_verification_block_order);
// Validate sizes.
{
s64 hash_size = m_hash_storage->GetSize();
s64 data_size = m_data_storage->GetSize();
ASSERT(((hash_size / HashSize) * m_verification_block_size) >= data_size);
}
// Set data.
m_is_real_data = is_real_data;
}
void IntegrityVerificationStorage::Finalize() {
m_hash_storage = VirtualFile();
m_data_storage = VirtualFile();
}
size_t IntegrityVerificationStorage::Read(u8* buffer, size_t size, size_t offset) const {
// Validate preconditions.
ASSERT(Common::IsAligned(offset, static_cast<size_t>(m_verification_block_size)));
ASSERT(Common::IsAligned(size, static_cast<size_t>(m_verification_block_size)));
// Succeed if zero size.
if (size == 0) {
return size;
}
// Validate arguments.
ASSERT(buffer != nullptr);
// Validate the offset.
s64 data_size = m_data_storage->GetSize();
ASSERT(offset <= static_cast<size_t>(data_size));
// Validate the access range.
ASSERT(R_SUCCEEDED(IStorage::CheckAccessRange(
offset, size, Common::AlignUp(data_size, static_cast<size_t>(m_verification_block_size)))));
// Determine the read extents.
size_t read_size = size;
if (static_cast<s64>(offset + read_size) > data_size) {
// Determine the padding sizes.
s64 padding_offset = data_size - offset;
size_t padding_size = static_cast<size_t>(
m_verification_block_size - (padding_offset & (m_verification_block_size - 1)));
ASSERT(static_cast<s64>(padding_size) < m_verification_block_size);
// Clear the padding.
std::memset(static_cast<u8*>(buffer) + padding_offset, 0, padding_size);
// Set the new in-bounds size.
read_size = static_cast<size_t>(data_size - offset);
}
// Perform the read.
return m_data_storage->Read(buffer, read_size, offset);
}
size_t IntegrityVerificationStorage::GetSize() const {
return m_data_storage->GetSize();
}
} // namespace FileSys
|
