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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <memory>
#include "common/assert.h"
#include "common/common_types.h"
#include "common/string_util.h"
#include "common/swap.h"
#include "core/file_sys/fsmitm_romfsbuild.h"
#include "core/file_sys/romfs.h"
#include "core/file_sys/vfs.h"
#include "core/file_sys/vfs_cached.h"
#include "core/file_sys/vfs_concat.h"
#include "core/file_sys/vfs_offset.h"
#include "core/file_sys/vfs_vector.h"
namespace FileSys {
namespace {
constexpr u32 ROMFS_ENTRY_EMPTY = 0xFFFFFFFF;
struct TableLocation {
u64_le offset;
u64_le size;
};
static_assert(sizeof(TableLocation) == 0x10, "TableLocation has incorrect size.");
struct RomFSHeader {
u64_le header_size;
TableLocation directory_hash;
TableLocation directory_meta;
TableLocation file_hash;
TableLocation file_meta;
u64_le data_offset;
};
static_assert(sizeof(RomFSHeader) == 0x50, "RomFSHeader has incorrect size.");
struct DirectoryEntry {
u32_le parent;
u32_le sibling;
u32_le child_dir;
u32_le child_file;
u32_le hash;
u32_le name_length;
};
static_assert(sizeof(DirectoryEntry) == 0x18, "DirectoryEntry has incorrect size.");
struct FileEntry {
u32_le parent;
u32_le sibling;
u64_le offset;
u64_le size;
u32_le hash;
u32_le name_length;
};
static_assert(sizeof(FileEntry) == 0x20, "FileEntry has incorrect size.");
template <typename Entry>
std::pair<Entry, std::string> GetEntry(const VirtualFile& file, std::size_t offset) {
Entry entry{};
if (file->ReadObject(&entry, offset) != sizeof(Entry))
return {};
std::string string(entry.name_length, '\0');
if (file->ReadArray(&string[0], string.size(), offset + sizeof(Entry)) != string.size())
return {};
return {entry, string};
}
void ProcessFile(const VirtualFile& file, std::size_t file_offset, std::size_t data_offset,
u32 this_file_offset, std::shared_ptr<VectorVfsDirectory>& parent) {
while (this_file_offset != ROMFS_ENTRY_EMPTY) {
auto entry = GetEntry<FileEntry>(file, file_offset + this_file_offset);
parent->AddFile(std::make_shared<OffsetVfsFile>(
file, entry.first.size, entry.first.offset + data_offset, entry.second));
this_file_offset = entry.first.sibling;
}
}
void ProcessDirectory(const VirtualFile& file, std::size_t dir_offset, std::size_t file_offset,
std::size_t data_offset, u32 this_dir_offset,
std::shared_ptr<VectorVfsDirectory>& parent) {
while (this_dir_offset != ROMFS_ENTRY_EMPTY) {
auto entry = GetEntry<DirectoryEntry>(file, dir_offset + this_dir_offset);
auto current = std::make_shared<VectorVfsDirectory>(
std::vector<VirtualFile>{}, std::vector<VirtualDir>{}, entry.second);
if (entry.first.child_file != ROMFS_ENTRY_EMPTY) {
ProcessFile(file, file_offset, data_offset, entry.first.child_file, current);
}
if (entry.first.child_dir != ROMFS_ENTRY_EMPTY) {
ProcessDirectory(file, dir_offset, file_offset, data_offset, entry.first.child_dir,
current);
}
parent->AddDirectory(current);
this_dir_offset = entry.first.sibling;
}
}
} // Anonymous namespace
VirtualDir ExtractRomFS(VirtualFile file) {
auto root_container = std::make_shared<VectorVfsDirectory>();
if (!file) {
return root_container;
}
RomFSHeader header{};
if (file->ReadObject(&header) != sizeof(RomFSHeader)) {
return root_container;
}
if (header.header_size != sizeof(RomFSHeader)) {
return root_container;
}
const u64 file_offset = header.file_meta.offset;
const u64 dir_offset = header.directory_meta.offset;
ProcessDirectory(file, dir_offset, file_offset, header.data_offset, 0, root_container);
if (auto root = root_container->GetSubdirectory(""); root) {
return std::make_shared<CachedVfsDirectory>(std::move(root));
}
ASSERT(false);
return nullptr;
}
VirtualFile CreateRomFS(VirtualDir dir, VirtualDir ext) {
if (dir == nullptr)
return nullptr;
RomFSBuildContext ctx{dir, ext};
return ConcatenatedVfsFile::MakeConcatenatedFile(0, dir->GetName(), ctx.Build());
}
} // namespace FileSys
|
