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
141
142
143
144
145
146
147
148
149
150
151
152
153
|
#include "GcmDisc.h"
#include <algorithm>
#include <fstream>
#include <stdexcept>
namespace GC {
uint32_t DolFileSize(const uint8_t* header) {
uint32_t size = 0x100;
for (int i = 0; i < 18; i++) {
const uint32_t offset = ReadBE32(header + i * 4);
const uint32_t length = ReadBE32(header + 0x90 + i * 4);
if (offset != 0 && length != 0) {
size = std::max(size, offset + length);
}
}
return size;
}
bool GcmDisc::Probe(IBlockReader& reader) {
if (reader.Size() < BOOT_SIZE) {
return false;
}
uint8_t magic[4];
reader.Read(0x1C, magic, 4);
return ReadBE32(magic) == MAGIC;
}
GcmDisc::GcmDisc(std::shared_ptr<IBlockReader> reader) : mReader(std::move(reader)) {
auto boot = mReader->Read(0, BOOT_SIZE);
if (ReadBE32(boot.data() + 0x1C) != MAGIC) {
throw std::runtime_error("Not a GameCube disc image");
}
mGameId = std::string(reinterpret_cast<const char*>(boot.data()), 6);
mRevision = boot[0x07];
mDolOffset = ReadBE32(boot.data() + 0x420);
mFstOffset = ReadBE32(boot.data() + 0x424);
mFstSize = ReadBE32(boot.data() + 0x428);
ParseFst(mReader->Read(mFstOffset, mFstSize));
}
void GcmDisc::ParseFst(const std::vector<uint8_t>& fst) {
if (fst.size() < 12 || !(fst[0] & 1)) {
throw std::runtime_error("GCM: malformed FST root");
}
const uint32_t count = ReadBE32(fst.data() + 8);
const size_t stringTable = static_cast<size_t>(count) * 12;
if (stringTable > fst.size()) {
throw std::runtime_error("GCM: FST entry count exceeds FST size");
}
auto nameAt = [&](uint32_t offset) {
const size_t start = stringTable + offset;
if (start >= fst.size()) {
throw std::runtime_error("GCM: FST name out of range");
}
size_t end = start;
while (end < fst.size() && fst[end] != 0) {
end++;
}
return std::string(reinterpret_cast<const char*>(fst.data() + start), end - start);
};
std::vector<std::pair<uint32_t, std::string>> dirs = { { count, "" } };
for (uint32_t i = 1; i < count; i++) {
while (dirs.size() > 1 && i >= dirs.back().first) {
dirs.pop_back();
}
const uint8_t* e = fst.data() + i * 12;
const bool isDir = e[0] & 1;
const std::string name = nameAt(ReadBE32(e) & 0xFFFFFF);
const std::string path = dirs.back().second + name;
if (isDir) {
dirs.emplace_back(ReadBE32(e + 8), path + "/");
} else {
mFiles["files/" + path] = { ReadBE32(e + 4), ReadBE32(e + 8) };
}
}
}
uint32_t GcmDisc::GetDolSize() {
auto header = mReader->Read(mDolOffset, 0x100);
return DolFileSize(header.data());
}
bool GcmDisc::Exists(const std::string& path) {
if (path == "sys/main.dol" || path == "sys/boot.bin" || path == "sys/bi2.bin" || path == "sys/fst.bin") {
return true;
}
return mFiles.contains(path);
}
std::vector<uint8_t> GcmDisc::ReadFile(const std::string& path) {
if (path == "sys/main.dol") {
return mReader->Read(mDolOffset, GetDolSize());
}
if (path == "sys/boot.bin") {
return mReader->Read(0, 0x440);
}
if (path == "sys/bi2.bin") {
return mReader->Read(0x440, 0x2000);
}
if (path == "sys/fst.bin") {
return mReader->Read(mFstOffset, mFstSize);
}
auto it = mFiles.find(path);
if (it == mFiles.end()) {
throw std::runtime_error("GCM: file not found: " + path);
}
return mReader->Read(it->second.offset, it->second.size);
}
FolderDisc::FolderDisc(std::filesystem::path root) : mRoot(std::move(root)) {}
bool FolderDisc::Probe(const std::filesystem::path& root) {
std::error_code ec;
return std::filesystem::is_directory(root, ec) && std::filesystem::exists(root / "sys" / "main.dol", ec);
}
bool FolderDisc::Exists(const std::string& path) {
std::error_code ec;
return std::filesystem::is_regular_file(mRoot / path, ec);
}
std::vector<uint8_t> FolderDisc::ReadFile(const std::string& path) {
std::ifstream input(mRoot / path, std::ios::binary);
if (!input.is_open()) {
throw std::runtime_error("Folder disc: file not found: " + path);
}
return std::vector<uint8_t>(std::istreambuf_iterator<char>(input), {});
}
void FolderDisc::LoadBoot() {
if (!mBoot.has_value()) {
mBoot = Exists("sys/boot.bin") ? ReadFile("sys/boot.bin") : std::vector<uint8_t>();
}
}
std::string FolderDisc::GetGameId() {
LoadBoot();
if (mBoot->size() < 8) {
return "GAMECUBE";
}
return std::string(reinterpret_cast<const char*>(mBoot->data()), 6);
}
uint8_t FolderDisc::GetRevision() {
LoadBoot();
return mBoot->size() < 8 ? 0 : (*mBoot)[7];
}
} // namespace GC
|
