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refactor: allow custom path to db and infra.dll

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鲁树人 2024-10-18 05:35:17 +09:00
parent db21f35b3f
commit a8c7bbe903
1 changed files with 84 additions and 25 deletions
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103
src/main.cpp
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@ -22,25 +22,22 @@ constexpr std::array<uint8_t, 16> kMagicHeader{0x7C, 0xD5, 0x32, 0xEB, 0x86, 0x0
0xA8, 0xAF, 0xA6, 0x8E, 0x0F, 0xFF, 0x99, 0x14};
void DecryptKGG(const kgm_ekey_db_t& ekey_db, const std::filesystem::path& kgg_file) {
auto kgg_fname = kgg_file.filename().wstring();
fwprintf(stderr, L"[INFO] reading %s...\n", kgg_fname.c_str());
std::ifstream ifs_kgg(kgg_file, std::ios::binary);
char header[0x100]{};
ifs_kgg.read(header, sizeof(ifs_kgg));
if (std::equal(kMagicHeader.cbegin(), kMagicHeader.cend(), header)) {
fprintf(stderr, "[WARN] invalid kgg header, skip.\n");
fprintf(stderr, "[WARN] ! invalid kgg header, skip.\n");
return;
}
uint32_t offset_to_audio = *reinterpret_cast<uint32_t*>(&header[0x10]);
uint32_t encrypt_mode = *reinterpret_cast<uint32_t*>(&header[0x14]);
if (encrypt_mode != 5) {
fprintf(stderr, "[WARN] invalid enc_version (expect=0x05, got 0x%02x), skip.\n", encrypt_mode);
fprintf(stderr, "[WARN] ! invalid enc_version (expect=0x05, got 0x%02x), skip.\n", encrypt_mode);
return;
}
uint32_t audio_hash_len = *reinterpret_cast<uint32_t*>(&header[0x44]);
if (audio_hash_len != 0x20) {
fprintf(stderr, "[WARN] audio hash length invalid (expect=0x20, got 0x%02x), skip.\n", audio_hash_len);
fprintf(stderr, "[WARN] ! audio hash length invalid (expect=0x20, got 0x%02x), skip.\n", audio_hash_len);
return;
}
std::string audio_hash(&header[0x48], &header[0x48 + audio_hash_len]);
@ -48,19 +45,19 @@ void DecryptKGG(const kgm_ekey_db_t& ekey_db, const std::filesystem::path& kgg_f
if (auto it = ekey_db.find(audio_hash); it != ekey_db.end()) {
ekey = it->second;
} else {
fprintf(stderr, "[WARN] ekey not found, skip.\n");
fprintf(stderr, "[WARN] ! ekey not found, skip.\n");
return;
}
auto qmc2 = QMC2::Create(ekey);
if (!qmc2) {
fprintf(stderr, "[WARN] create qmc2 failed, skip.\n");
fprintf(stderr, "[WARN] ! create qmc2 failed, skip.\n");
return;
}
ifs_kgg.seekg(offset_to_audio, std::ios::beg);
std::vector<uint8_t> buffer(1024 * 1024);
ifs_kgg.read(reinterpret_cast<char*>(buffer.data()), buffer.size());
ifs_kgg.read(reinterpret_cast<char*>(buffer.data()), 4);
auto n = static_cast<size_t>(ifs_kgg.gcount());
qmc2->Decrypt(std::span(buffer.begin(), n), 0);
@ -74,7 +71,7 @@ void DecryptKGG(const kgm_ekey_db_t& ekey_db, const std::filesystem::path& kgg_f
decrypted_path.replace_filename(decrypted_path.stem().wstring() + L"_kgg-dec.mp3");
}
if (exists(decrypted_path)) {
fprintf(stderr, "[WARN] output file '%s' exists, skip.\n", decrypted_path.filename().string().c_str());
fprintf(stderr, "[WARN] ! output file '%s' exists, skip.\n", decrypted_path.filename().string().c_str());
return;
}
@ -88,9 +85,11 @@ void DecryptKGG(const kgm_ekey_db_t& ekey_db, const std::filesystem::path& kgg_f
ofs_decrypted.write(reinterpret_cast<char*>(buffer.data()), n);
offset += n;
}
qmc2.reset();
auto decrypted_fname = decrypted_path.filename().wstring();
fwprintf(stderr, L"[INFO] OK! kgg --> %s\n", decrypted_fname.c_str());
auto kgg_fname = kgg_file.filename();
auto decrypted_fname = decrypted_path.filename();
fwprintf(stderr, L"[INFO] * OK! %s --> %s\n", kgg_fname.c_str(), decrypted_fname.c_str());
}
void WalkFileOrDir(const kgm_ekey_db_t& ekey_db, const std::filesystem::path& input_path) {
@ -100,23 +99,86 @@ void WalkFileOrDir(const kgm_ekey_db_t& ekey_db, const std::filesystem::path& in
}
} else if (is_regular_file(input_path)) {
DecryptKGG(ekey_db, input_path);
} else {
fwprintf(stderr, L"[WARN] invalid path: %s\n", input_path.c_str());
}
}
std::pair<std::vector<std::wstring>, std::unordered_map<std::wstring, std::wstring>> ParseCommandLine() {
int argc;
wchar_t** argv = CommandLineToArgvW(GetCommandLineW(), &argc);
std::vector<std::wstring> positional_args{};
std::unordered_map<std::wstring, std::wstring> named_args{};
bool positional_only{false};
for (int i = 1; i < argc; i++) {
std::wstring arg{argv[i]};
if (arg == L"--") {
positional_only = true;
continue;
}
if (!positional_only && arg.starts_with(L"--")) {
auto pos = arg.find(L'=');
if (pos != std::wstring::npos) {
named_args[arg.substr(2, pos - 2)] = arg.substr(pos + 1);
} else if (++i < argc) {
named_args[arg.substr(2)] = argv[i];
} else {
named_args[arg.substr(2)] = L"";
}
} else {
positional_args.push_back(arg);
}
}
return std::make_pair(positional_args, named_args);
}
int main() {
SetConsoleOutputCP(CP_UTF8);
setlocale(LC_ALL, ".UTF8");
fputs("kgg-dec v0.1 by LSR\n", stderr);
fputs("Usage: kgg-dec [kgg-dir=.]\n\n", stderr);
fputs(
"Usage: kgg-dec "
"[--infra-dll infra.dll] "
"[--db /path/to/KGMusicV3.db] "
"[--] [kgg-dir... = '.']\n\n",
stderr);
auto [positional_args, named_args] = ParseCommandLine();
if (positional_args.empty()) {
positional_args.emplace_back(L".");
}
std::filesystem::path kgm_db_path{};
std::filesystem::path infra_dll_path{L"infra.dll"};
if (auto it = named_args.find(L"infra-dll"); it != named_args.end()) {
infra_dll_path = std::filesystem::path{it->second};
}
infra_dll_path = absolute(infra_dll_path);
if (!exists(infra_dll_path)) {
fputs("[ERR ] infra.dll not found\n", stderr);
return 1;
}
if (auto it = named_args.find(L"db"); it != named_args.end()) {
kgm_db_path = std::filesystem::path{it->second};
} else {
PWSTR pAppDirPath{};
SHGetKnownFolderPath(FOLDERID_RoamingAppData, 0, nullptr, &pAppDirPath);
std::filesystem::path kgmPath{pAppDirPath};
kgm_db_path = std::filesystem::path{pAppDirPath} / L"Kugou8" / L"KGMusicV3.db";
CoTaskMemFree(pAppDirPath);
kgmPath = kgmPath / L"Kugou8" / L"KGMusicV3.db";
}
if (!exists(kgm_db_path)) {
fputs("[ERR ] KGMusicV3.db not found\n", stderr);
return 1;
}
int error{-1};
Infra::KugouDb db{L"infra.dll", kgmPath};
Infra::KugouDb db{infra_dll_path, kgm_db_path};
if (!db.IsOpen()) {
fprintf(stderr, "[ERR ] db init error: is infra.dll ok?\n");
return 1;
@ -135,12 +197,9 @@ int main() {
}
#endif
int argc;
wchar_t** argv = CommandLineToArgvW(GetCommandLineW(), &argc);
std::filesystem::path input_dir{(argc < 2) ? L"." : argv[1]};
input_dir = absolute(input_dir);
WalkFileOrDir(ekey_db, input_dir);
for (auto& positional_arg : positional_args) {
WalkFileOrDir(ekey_db, positional_arg);
}
return 0;
}