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afba535e001ded7b7f7440e0739544745a145290
psopeeps-newserv/src/Quest.cc
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Martin Michelsen 8afc952294 simplify decryption seed finder
2022-09-21 00:10:47 -07:00

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#include "Quest.hh"
#include <algorithm>
#include <mutex>
#include <string>
#include <unordered_map>
#include <phosg/Filesystem.hh>
#include <phosg/Encoding.hh>
#include <phosg/Hash.hh>
#include <phosg/Random.hh>
#include <phosg/Strings.hh>
#include <phosg/Tools.hh>
#include "Loggers.hh"
#include "CommandFormats.hh"
#include "Compression.hh"
#include "PSOEncryption.hh"
#include "Text.hh"
using namespace std;
// GCI decoding logic
struct ShuffleTables {
uint8_t forward_table[0x100]; // table1 / 804FB9B8
uint8_t reverse_table[0x100]; // table2 / 804FBAB8
ShuffleTables(PSOV2Encryption& crypt) {
for (size_t x = 0; x < 0x100; x++) {
this->forward_table[x] = x;
}
int32_t r28 = 0xFF;
uint8_t* r31 = &this->forward_table[0xFF];
while (r28 >= 0) {
uint32_t r3 = this->pseudorand(crypt, r28 + 1);
if (r3 >= 0x100) {
throw logic_error("bad r3");
}
uint8_t t = this->forward_table[r3];
this->forward_table[r3] = *r31;
*r31 = t;
this->reverse_table[t] = r28;
r31--;
r28--;
}
}
static uint32_t pseudorand(PSOV2Encryption& crypt, uint32_t prev) {
return (((prev & 0xFFFF) * ((crypt.next() >> 16) & 0xFFFF)) >> 16) & 0xFFFF;
}
void shuffle(void* vdest, const void* vsrc, size_t size, bool reverse) {
uint8_t* dest = reinterpret_cast<uint8_t*>(vdest);
const uint8_t* src = reinterpret_cast<const uint8_t*>(vsrc);
const uint8_t* table = reverse ? this->reverse_table : this->forward_table;
for (size_t block_offset = 0; block_offset < (size & 0xFFFFFF00); block_offset += 0x100) {
for (size_t z = 0; z < 0x100; z++) {
dest[block_offset + table[z]] = src[block_offset + z];
}
}
// Any remaining bytes that don't fill an entire block are not shuffled
memcpy(&dest[size & 0xFFFFFF00], &src[size & 0xFFFFFF00], size & 0xFF);
}
};
struct PSOGCIFileHeader {
parray<uint8_t, 0x40> gci_header;
ptext<char, 0x1C> game_name; // e.g. "PSO EPISODE I & II"
be_uint32_t embedded_seed; // Used in some of Ralf's quest packs
ptext<char, 0x20> quest_name;
parray<uint8_t, 0x2000> banner_and_icon;
// data_size specifies the number of bytes in the encrypted section, including
// the encrypted header (below) and all encrypted data after it.
be_uint32_t data_size;
// To compute checksum, set checksum to zero, then compute the CRC32 of all
// fields in this struct except gci_header. (Yes, including the checksum
// field, which is temporarily zero.)
be_uint32_t checksum;
bool checksum_correct() const {
uint32_t cs = crc32(&this->game_name, sizeof(this->game_name));
cs = crc32(&this->embedded_seed, sizeof(this->embedded_seed), cs);
cs = crc32(&this->quest_name, sizeof(this->quest_name), cs);
cs = crc32(&this->banner_and_icon, sizeof(this->banner_and_icon), cs);
cs = crc32(&this->data_size, sizeof(this->data_size), cs);
cs = crc32("\0\0\0\0", 4, cs);
return (cs == this->checksum);
}
} __attribute__((packed));
struct PSOGCIFileEncryptedHeader {
be_uint32_t round2_seed;
// To compute checksum, set checksum to zero, then compute the CRC32 of the
// entire data section, including this header struct (but not the unencrypted
// header struct).
be_uint32_t checksum;
le_uint32_t decompressed_size;
le_uint32_t round3_seed;
// Data follows here.
} __attribute__((packed));
string decrypt_gci_data_section(
const void* data_section, size_t size, uint32_t seed) {
string decrypted(size, '\0');
{
PSOV2Encryption shuf_crypt(seed);
ShuffleTables shuf(shuf_crypt);
shuf.shuffle(decrypted.data(), data_section, size, true);
}
auto* be_dwords = reinterpret_cast<be_uint32_t*>(decrypted.data());
PSOV2Encryption crypt(seed);
for (size_t z = 0; z < decrypted.size() / sizeof(be_uint32_t); z++) {
be_dwords[z] = crypt.next() - be_dwords[z];
}
auto* header = reinterpret_cast<PSOGCIFileEncryptedHeader*>(
decrypted.data());
PSOV2Encryption(header->round2_seed).encrypt_big_endian(
decrypted.data() + 4, (decrypted.size() - 4) & (~3));
uint32_t expected_crc = header->checksum;
header->checksum = 0;
uint32_t actual_crc = crc32(decrypted.data(), decrypted.size());
header->checksum = expected_crc;
if (expected_crc != actual_crc) {
throw runtime_error("incorrect decrypted data section checksum");
}
size_t orig_size = decrypted.size();
decrypted.resize((orig_size + 3) & (~3));
PSOV2Encryption(header->round3_seed).decrypt(
decrypted.data() + sizeof(PSOGCIFileEncryptedHeader),
decrypted.size() - sizeof(PSOGCIFileEncryptedHeader));
decrypted.resize(orig_size);
string ret = decrypted.substr(sizeof(PSOGCIFileEncryptedHeader));
// Some GCI files have decompressed_size fields that are 8 bytes smaller than
// the actual decompressed size of the data. They seem to work fine, so we
// accept both cases as correct.
size_t decompressed_size = prs_decompress_size(ret);
if ((decompressed_size != header->decompressed_size) &&
(decompressed_size != header->decompressed_size - 8)) {
throw runtime_error(string_printf(
"decompressed size (%zu) does not match size in header (%" PRId32 ")",
decompressed_size, header->decompressed_size.load()));
}
return ret;
}
string find_seed_and_decrypt_gci_data_section(
const void* data_section, size_t size, size_t num_threads) {
mutex result_lock;
string result;
uint64_t result_seed = parallel_range<uint64_t>([&](uint64_t seed, size_t) {
try {
string ret = decrypt_gci_data_section(data_section, size, seed);
lock_guard<mutex> g(result_lock);
result = move(ret);
return true;
} catch (const runtime_error&) {
return false;
}
}, 0, 0x100000000, num_threads);
if (!result.empty() && (result_seed < 0x100000000)) {
static_game_data_log.info("Found seed %08" PRIX64 " to decrypt GCI file",
result_seed);
return result;
} else {
throw runtime_error("no seed found");
}
}
struct PSODownloadQuestHeader {
// When sending a DLQ to the client, this is the DECOMPRESSED size. When
// reading it from an (unencrypted) GCI file, this is the COMPRESSED size.
le_uint32_t size;
// Note: use PSO PC encryption, even for GC quests.
le_uint32_t encryption_seed;
} __attribute__((packed));
bool category_is_mode(QuestCategory category) {
return (category == QuestCategory::BATTLE) ||
(category == QuestCategory::CHALLENGE) ||
(category == QuestCategory::EPISODE_3);
}
const char* name_for_category(QuestCategory category) {
switch (category) {
case QuestCategory::RETRIEVAL:
return "Retrieval";
case QuestCategory::EXTERMINATION:
return "Extermination";
case QuestCategory::EVENT:
return "Event";
case QuestCategory::SHOP:
return "Shop";
case QuestCategory::VR:
return "VR";
case QuestCategory::TOWER:
return "Tower";
case QuestCategory::GOVERNMENT_EPISODE_1:
return "GovernmentEpisode1";
case QuestCategory::GOVERNMENT_EPISODE_2:
return "GovernmentEpisode2";
case QuestCategory::GOVERNMENT_EPISODE_4:
return "GovernmentEpisode4";
case QuestCategory::DOWNLOAD:
return "Download";
case QuestCategory::BATTLE:
return "Battle";
case QuestCategory::CHALLENGE:
return "Challenge";
case QuestCategory::SOLO:
return "Solo";
case QuestCategory::EPISODE_3:
return "Episode3";
default:
return "Unknown";
}
}
static const char* name_for_episode(uint8_t episode) {
switch (episode) {
case 0:
return "Ep1";
case 1:
return "Ep2";
case 2:
return "Ep4";
case 0xFF:
return "Ep3";
default:
return "InvalidEpisode";
}
}
struct PSOQuestHeaderDC { // same for dc v1 and v2, thankfully
uint32_t start_offset;
uint32_t unknown_offset1;
uint32_t size;
uint32_t unused;
uint8_t is_download;
uint8_t unknown1;
uint16_t quest_number; // 0xFFFF for challenge quests
ptext<char, 0x20> name;
ptext<char, 0x80> short_description;
ptext<char, 0x120> long_description;
} __attribute__((packed));
struct PSOQuestHeaderPC {
uint32_t start_offset;
uint32_t unknown_offset1;
uint32_t size;
uint32_t unused;
uint8_t is_download;
uint8_t unknown1;
uint16_t quest_number; // 0xFFFF for challenge quests
ptext<char16_t, 0x20> name;
ptext<char16_t, 0x80> short_description;
ptext<char16_t, 0x120> long_description;
} __attribute__((packed));
// TODO: Is the XB quest header format the same as on GC? If not, make a
// separate struct; if so, rename this struct to V3.
struct PSOQuestHeaderGC {
uint32_t start_offset;
uint32_t unknown_offset1;
uint32_t size;
uint32_t unused;
uint8_t is_download;
uint8_t unknown1;
uint8_t quest_number;
uint8_t episode; // 1 = ep2. apparently some quests have 0xFF here, which means ep1 (?)
ptext<char, 0x20> name;
ptext<char, 0x80> short_description;
ptext<char, 0x120> long_description;
} __attribute__((packed));
struct PSOQuestHeaderGCEpisode3 {
// there's actually a lot of other important stuff in here but I'm lazy. it
// looks like map data, cutscene data, and maybe special cards used during
// the quest
parray<uint8_t, 0x1DF0> unknown_a1;
ptext<char, 0x14> name;
ptext<char, 0x14> location;
ptext<char, 0x3C> location2;
ptext<char, 0x190> description;
parray<uint8_t, 0x3A34> unknown_a2;
} __attribute__((packed));
struct PSOQuestHeaderBB {
uint32_t start_offset;
uint32_t unknown_offset1;
uint32_t size;
uint32_t unused;
uint16_t quest_number; // 0xFFFF for challenge quests
uint16_t unused2;
uint8_t episode; // 0 = ep1, 1 = ep2, 2 = ep4
uint8_t max_players;
uint8_t joinable_in_progress;
uint8_t unknown;
ptext<char16_t, 0x20> name;
ptext<char16_t, 0x80> short_description;
ptext<char16_t, 0x120> long_description;
} __attribute__((packed));
Quest::Quest(const string& bin_filename)
: internal_id(-1),
menu_item_id(0),
category(QuestCategory::UNKNOWN),
episode(0),
is_dcv1(false),
joinable(false),
file_format(FileFormat::BIN_DAT) {
if (ends_with(bin_filename, ".bin.gci")) {
this->file_format = FileFormat::BIN_DAT_GCI;
this->file_basename = bin_filename.substr(0, bin_filename.size() - 8);
} else if (ends_with(bin_filename, ".bin.dlq")) {
this->file_format = FileFormat::BIN_DAT_DLQ;
this->file_basename = bin_filename.substr(0, bin_filename.size() - 8);
} else if (ends_with(bin_filename, ".qst")) {
this->file_format = FileFormat::QST;
this->file_basename = bin_filename.substr(0, bin_filename.size() - 4);
} else if (ends_with(bin_filename, ".bin")) {
this->file_format = FileFormat::BIN_DAT;
this->file_basename = bin_filename.substr(0, bin_filename.size() - 4);
} else if (ends_with(bin_filename, ".bind")) {
this->file_format = FileFormat::BIN_DAT_UNCOMPRESSED;
this->file_basename = bin_filename.substr(0, bin_filename.size() - 5);
} else {
throw runtime_error("quest does not have a valid .bin file");
}
string basename;
{
size_t slash_pos = this->file_basename.rfind('/');
if (slash_pos != string::npos) {
basename = this->file_basename.substr(slash_pos + 1);
} else {
basename = this->file_basename;
}
}
// quest filenames are like:
// b###-VV.bin for battle mode
// c###-VV.bin for challenge mode
// e###-gc3.bin for episode 3
// q###-CAT-VV.bin for normal quests
if (basename.empty()) {
throw invalid_argument("empty filename");
}
if (basename[0] == 'b') {
this->category = QuestCategory::BATTLE;
} else if (basename[0] == 'c') {
this->category = QuestCategory::CHALLENGE;
} else if (basename[0] == 'e') {
this->category = QuestCategory::EPISODE_3;
} else if (basename[0] != 'q') {
throw invalid_argument("filename does not indicate mode");
}
// if the quest category is still unknown, expect 3 tokens (one of them will
// tell us the category)
vector<string> tokens = split(basename, '-');
if (tokens.size() != (2 + (this->category == QuestCategory::UNKNOWN))) {
throw invalid_argument("incorrect filename format");
}
// parse the number out of the first token
this->internal_id = strtoull(tokens[0].c_str() + 1, nullptr, 10);
// get the category from the second token if needed
if (this->category == QuestCategory::UNKNOWN) {
static const unordered_map<string, QuestCategory> name_to_category({
{"ret", QuestCategory::RETRIEVAL},
{"ext", QuestCategory::EXTERMINATION},
{"evt", QuestCategory::EVENT},
{"shp", QuestCategory::SHOP},
{"vr", QuestCategory::VR},
{"twr", QuestCategory::TOWER},
// Note: This will be overwritten later for Episode 2 & 4 quests - we
// haven't parsed the episode from the quest script yet
{"gov", QuestCategory::GOVERNMENT_EPISODE_1},
{"dl", QuestCategory::DOWNLOAD},
{"1p", QuestCategory::SOLO},
});
this->category = name_to_category.at(tokens[1]);
tokens.erase(tokens.begin() + 1);
}
static const unordered_map<string, GameVersion> name_to_version({
{"d1", GameVersion::DC},
{"dc", GameVersion::DC},
{"pc", GameVersion::PC},
{"gc", GameVersion::GC},
{"gc3", GameVersion::GC},
{"xb", GameVersion::XB},
{"bb", GameVersion::BB},
});
this->version = name_to_version.at(tokens[1]);
// The rest of the information needs to be fetched from the .bin file's
// contents
auto bin_compressed = this->bin_contents();
auto bin_decompressed = prs_decompress(*bin_compressed);
switch (this->version) {
case GameVersion::PATCH:
throw invalid_argument("patch server quests are not valid");
break;
case GameVersion::DC: {
if (bin_decompressed.size() < sizeof(PSOQuestHeaderDC)) {
throw invalid_argument("file is too small for header");
}
auto* header = reinterpret_cast<const PSOQuestHeaderDC*>(bin_decompressed.data());
this->joinable = false;
this->episode = 0;
this->name = decode_sjis(header->name);
this->short_description = decode_sjis(header->short_description);
this->long_description = decode_sjis(header->long_description);
this->is_dcv1 = (tokens[1] == "d1");
break;
}
case GameVersion::PC: {
if (bin_decompressed.size() < sizeof(PSOQuestHeaderPC)) {
throw invalid_argument("file is too small for header");
}
auto* header = reinterpret_cast<const PSOQuestHeaderPC*>(bin_decompressed.data());
this->joinable = false;
this->episode = 0;
this->name = header->name;
this->short_description = header->short_description;
this->long_description = header->long_description;
break;
}
case GameVersion::XB:
case GameVersion::GC: {
if (this->category == QuestCategory::EPISODE_3) {
// these all appear to be the same size
if (bin_decompressed.size() != sizeof(PSOQuestHeaderGCEpisode3)) {
throw invalid_argument("file is incorrect size");
}
auto* header = reinterpret_cast<const PSOQuestHeaderGCEpisode3*>(bin_decompressed.data());
this->joinable = false;
this->episode = 0xFF;
this->name = decode_sjis(header->name);
this->short_description = decode_sjis(header->location2);
this->long_description = decode_sjis(header->description);
} else {
if (bin_decompressed.size() < sizeof(PSOQuestHeaderGC)) {
throw invalid_argument("file is too small for header");
}
auto* header = reinterpret_cast<const PSOQuestHeaderGC*>(bin_decompressed.data());
this->joinable = false;
this->episode = (header->episode == 1);
this->name = decode_sjis(header->name);
this->short_description = decode_sjis(header->short_description);
this->long_description = decode_sjis(header->long_description);
}
break;
}
case GameVersion::BB: {
if (bin_decompressed.size() < sizeof(PSOQuestHeaderBB)) {
throw invalid_argument("file is too small for header");
}
auto* header = reinterpret_cast<const PSOQuestHeaderBB*>(bin_decompressed.data());
this->joinable = header->joinable_in_progress;
this->episode = header->episode;
this->name = header->name;
this->short_description = header->short_description;
this->long_description = header->long_description;
if (this->category == QuestCategory::GOVERNMENT_EPISODE_1) {
if (this->episode == 1) {
this->category = QuestCategory::GOVERNMENT_EPISODE_2;
} else if (this->episode == 2) {
this->category = QuestCategory::GOVERNMENT_EPISODE_4;
} else if (this->episode != 0) {
throw invalid_argument("government quest has invalid episode number");
}
}
break;
}
default:
throw logic_error("invalid quest game version");
}
}
static string basename_for_filename(const string& filename) {
size_t slash_pos = filename.rfind('/');
if (slash_pos != string::npos) {
return filename.substr(slash_pos + 1);
}
return filename;
}
string Quest::bin_filename() const {
return basename_for_filename(this->file_basename + ".bin");
}
string Quest::dat_filename() const {
return basename_for_filename(this->file_basename + ".dat");
}
shared_ptr<const string> Quest::bin_contents() const {
if (!this->bin_contents_ptr) {
switch (this->file_format) {
case FileFormat::BIN_DAT:
this->bin_contents_ptr.reset(new string(load_file(this->file_basename + ".bin")));
break;
case FileFormat::BIN_DAT_UNCOMPRESSED:
this->bin_contents_ptr.reset(new string(prs_compress(load_file(this->file_basename + ".bind"))));
break;
case FileFormat::BIN_DAT_GCI:
this->bin_contents_ptr.reset(new string(this->decode_gci(this->file_basename + ".bin.gci", false)));
break;
case FileFormat::BIN_DAT_DLQ:
this->bin_contents_ptr.reset(new string(this->decode_dlq(this->file_basename + ".bin.dlq")));
break;
case FileFormat::QST: {
auto result = this->decode_qst(this->file_basename + ".qst");
this->bin_contents_ptr.reset(new string(move(result.first)));
this->dat_contents_ptr.reset(new string(move(result.second)));
break;
}
default:
throw logic_error("invalid quest file format");
}
}
return this->bin_contents_ptr;
}
shared_ptr<const string> Quest::dat_contents() const {
if (!this->dat_contents_ptr) {
switch (this->file_format) {
case FileFormat::BIN_DAT:
this->dat_contents_ptr.reset(new string(load_file(this->file_basename + ".dat")));
break;
case FileFormat::BIN_DAT_UNCOMPRESSED:
this->dat_contents_ptr.reset(new string(prs_compress(load_file(this->file_basename + ".datd"))));
break;
case FileFormat::BIN_DAT_GCI:
this->dat_contents_ptr.reset(new string(this->decode_gci(this->file_basename + ".dat.gci", false)));
break;
case FileFormat::BIN_DAT_DLQ:
this->dat_contents_ptr.reset(new string(this->decode_dlq(this->file_basename + ".dat.dlq")));
break;
case FileFormat::QST: {
auto result = this->decode_qst(this->file_basename + ".qst");
this->bin_contents_ptr.reset(new string(move(result.first)));
this->dat_contents_ptr.reset(new string(move(result.second)));
break;
}
default:
throw logic_error("invalid quest file format");
}
}
return this->dat_contents_ptr;
}
string Quest::decode_gci(
const string& filename, ssize_t find_seed_num_threads, int64_t known_seed) {
string data = load_file(filename);
StringReader r(data);
const auto& header = r.get<PSOGCIFileHeader>();
if (!header.checksum_correct()) {
throw runtime_error("GCI file unencrypted header checksum is incorrect");
}
const auto& encrypted_header = r.get<PSOGCIFileEncryptedHeader>(false);
// Unencrypted GCI files appear to always have zeroes in these fields.
// Encrypted GCI files are highly unlikely to have zeroes in ALL of these
// fields, so assume it's encrypted if any of them are nonzero.
if (encrypted_header.round2_seed || encrypted_header.checksum || encrypted_header.round3_seed) {
if (known_seed >= 0) {
return decrypt_gci_data_section(
r.getv(header.data_size), header.data_size, known_seed);
} else if (header.embedded_seed != 0) {
return decrypt_gci_data_section(
r.getv(header.data_size), header.data_size, header.embedded_seed);
} else {
if (find_seed_num_threads < 0) {
throw runtime_error("GCI file appears to be encrypted");
}
if (find_seed_num_threads == 0) {
find_seed_num_threads = thread::hardware_concurrency();
}
return find_seed_and_decrypt_gci_data_section(
r.getv(header.data_size), header.data_size, find_seed_num_threads);
}
} else { // Unencrypted GCI format
r.skip(sizeof(PSOGCIFileEncryptedHeader));
string compressed_data = r.readx(header.data_size - sizeof(PSOGCIFileEncryptedHeader));
size_t decompressed_bytes = prs_decompress_size(compressed_data);
size_t expected_decompressed_bytes = encrypted_header.decompressed_size - 8;
if (decompressed_bytes < expected_decompressed_bytes) {
throw runtime_error(string_printf(
"GCI decompressed data is smaller than expected size (have 0x%zX bytes, expected 0x%zX bytes)",
decompressed_bytes, expected_decompressed_bytes));
}
return compressed_data;
}
}
string Quest::decode_dlq(const string& filename) {
uint32_t decompressed_size;
uint32_t key;
string data;
{
auto f = fopen_unique(filename, "rb");
decompressed_size = freadx<le_uint32_t>(f.get());
key = freadx<le_uint32_t>(f.get());
data = read_all(f.get());
}
// The compressed data size does not need to be a multiple of 4, but the V2
// encryption (which is used for all download quests, even in V3) requires the
// data size to be a multiple of 4. We'll just temporarily stick a few bytes
// on the end, then throw them away later if needed.
PSOV2Encryption encr(key);
size_t original_size = data.size();
data.resize((data.size() + 3) & (~3));
encr.decrypt(data);
data.resize(original_size);
if (prs_decompress_size(data) != decompressed_size) {
throw runtime_error("decompressed size does not match size in header");
}
return data;
}
template <typename HeaderT, typename OpenFileT>
static pair<string, string> decode_qst_t(FILE* f) {
string qst_data = read_all(f);
StringReader r(qst_data);
string bin_contents;
string dat_contents;
string internal_bin_filename;
string internal_dat_filename;
uint32_t bin_file_size = 0;
uint32_t dat_file_size = 0;
while (!r.eof()) {
// Handle BB's implicit 8-byte command alignment
static constexpr size_t alignment = sizeof(HeaderT);
size_t next_command_offset = (r.where() + (alignment - 1)) & ~(alignment - 1);
r.go(next_command_offset);
if (r.eof()) {
break;
}
const auto& header = r.get<HeaderT>();
if (header.command == 0x44) {
if (header.size != sizeof(HeaderT) + sizeof(OpenFileT)) {
throw runtime_error("qst open file command has incorrect size");
}
const auto& cmd = r.get<OpenFileT>(f);
string internal_filename = cmd.filename;
if (ends_with(internal_filename, ".bin")) {
if (internal_bin_filename.empty()) {
internal_bin_filename = internal_filename;
} else {
throw runtime_error("qst contains multiple bin files");
}
bin_file_size = cmd.file_size;
} else if (ends_with(internal_filename, ".dat")) {
if (internal_dat_filename.empty()) {
internal_dat_filename = internal_filename;
} else {
throw runtime_error("qst contains multiple dat files");
}
dat_file_size = cmd.file_size;
} else {
throw runtime_error("qst contains non-bin, non-dat file");
}
} else if (header.command == 0x13) {
if (header.size != sizeof(HeaderT) + sizeof(S_WriteFile_13_A7)) {
throw runtime_error("qst write file command has incorrect size");
}
const auto& cmd = r.get<S_WriteFile_13_A7>();
string filename = cmd.filename;
string* dest = nullptr;
if (filename == internal_bin_filename) {
dest = &bin_contents;
} else if (filename == internal_dat_filename) {
dest = &dat_contents;
} else {
throw runtime_error("qst contains write commnd for non-open file");
}
if (cmd.data_size > 0x400) {
throw runtime_error("qst contains invalid write command");
}
if (dest->size() & 0x3FF) {
throw runtime_error("qst contains uneven chunks out of order");
}
if (header.flag != dest->size() / 0x400) {
throw runtime_error("qst contains chunks out of order");
}
dest->append(reinterpret_cast<const char*>(cmd.data), cmd.data_size);
} else {
throw runtime_error("invalid command in qst file");
}
}
if (bin_contents.size() != bin_file_size) {
throw runtime_error("bin file does not match expected size");
}
if (dat_contents.size() != dat_file_size) {
throw runtime_error("dat file does not match expected size");
}
return make_pair(bin_contents, dat_contents);
}
pair<string, string> Quest::decode_qst(const string& filename) {
auto f = fopen_unique(filename, "rb");
// qst files start with an open file command, but the format differs depending
// on the PSO version that the qst file is for. We can detect the format from
// the first 4 bytes in the file:
// - BB: 58 00 44 00
// - PC: 3C ?? 44 00
// - DC/V3: 44 ?? 3C 00
uint32_t signature = freadx<be_uint32_t>(f.get());
fseek(f.get(), 0, SEEK_SET);
if (signature == 0x58004400) {
return decode_qst_t<PSOCommandHeaderBB, S_OpenFile_BB_44_A6>(f.get());
} else if ((signature & 0xFF00FFFF) == 0x3C004400) {
return decode_qst_t<PSOCommandHeaderPC, S_OpenFile_PC_V3_44_A6>(f.get());
} else if ((signature & 0xFF00FFFF) == 0x44003C00) {
return decode_qst_t<PSOCommandHeaderDCV3, S_OpenFile_PC_V3_44_A6>(f.get());
} else {
throw runtime_error("invalid qst file format");
}
}
QuestIndex::QuestIndex(const string& directory) : directory(directory) {
auto filename_set = list_directory(this->directory);
vector<string> filenames(filename_set.begin(), filename_set.end());
sort(filenames.begin(), filenames.end());
uint32_t next_menu_item_id = 1;
for (const auto& filename : filenames) {
string full_path = this->directory + "/" + filename;
if (ends_with(filename, ".gba")) {
shared_ptr<string> contents(new string(load_file(full_path)));
this->gba_file_contents.emplace(make_pair(filename, contents));
continue;
}
if (ends_with(filename, ".bin") ||
ends_with(filename, ".bind") ||
ends_with(filename, ".bin.gci") ||
ends_with(filename, ".bin.dlq") ||
ends_with(filename, ".qst")) {
try {
shared_ptr<Quest> q(new Quest(full_path));
q->menu_item_id = next_menu_item_id++;
string ascii_name = encode_sjis(q->name);
if (!this->version_menu_item_id_to_quest.emplace(
make_pair(q->version, q->menu_item_id), q).second) {
throw logic_error("duplicate quest menu item id");
}
static_game_data_log.info("Indexed quest %s (%s-%" PRId64 " => %" PRIu32 ", %s, %s, joinable=%s, dcv1=%s)",
ascii_name.c_str(), name_for_version(q->version), q->internal_id,
q->menu_item_id, name_for_category(q->category), name_for_episode(q->episode),
q->joinable ? "true" : "false", q->is_dcv1 ? "true" : "false");
} catch (const exception& e) {
static_game_data_log.warning("Failed to parse quest file %s (%s)", filename.c_str(), e.what());
}
}
}
}
shared_ptr<const Quest> QuestIndex::get(GameVersion version,
uint32_t menu_item_id) const {
return this->version_menu_item_id_to_quest.at(make_pair(version, menu_item_id));
}
shared_ptr<const string> QuestIndex::get_gba(const string& name) const {
return this->gba_file_contents.at(name);
}
vector<shared_ptr<const Quest>> QuestIndex::filter(
GameVersion version, bool is_dcv1, QuestCategory category) const {
auto it = this->version_menu_item_id_to_quest.lower_bound(make_pair(version, 0));
auto end_it = this->version_menu_item_id_to_quest.upper_bound(make_pair(version, 0xFFFFFFFF));
vector<shared_ptr<const Quest>> ret;
for (; it != end_it; it++) {
shared_ptr<const Quest> q = it->second;
if ((q->is_dcv1 != is_dcv1) || (q->category != category)) {
continue;
}
ret.emplace_back(q);
}
return ret;
}
static string create_download_quest_file(const string& compressed_data,
size_t decompressed_size, uint32_t encryption_seed = 0) {
// Download quest files are like normal (PRS-compressed) quest files, but they
// are encrypted with the PSOPC encryption (even on V3 / PSO GC), and a small
// header (PSODownloadQuestHeader) is prepended to the encrypted data.
if (encryption_seed == 0) {
encryption_seed = random_object<uint32_t>();
}
string data(8, '\0');
auto* header = reinterpret_cast<PSODownloadQuestHeader*>(data.data());
header->size = decompressed_size;
header->encryption_seed = encryption_seed;
data += compressed_data;
// Add temporary extra bytes if necessary so encryption won't fail - the data
// size must be a multiple of 4 for PSO PC encryption.
size_t original_size = data.size();
data.resize((data.size() + 3) & (~3));
PSOV2Encryption encr(encryption_seed);
encr.encrypt(data.data() + sizeof(PSODownloadQuestHeader),
data.size() - sizeof(PSODownloadQuestHeader));
data.resize(original_size);
return data;
}
shared_ptr<Quest> Quest::create_download_quest() const {
// The download flag needs to be set in the bin header, or else the client
// will ignore it when scanning for download quests in an offline game. To set
// this flag, we need to decompress the quest's .bin file, set the flag, then
// recompress it again.
string decompressed_bin = prs_decompress(*this->bin_contents());
void* data_ptr = decompressed_bin.data();
switch (this->version) {
case GameVersion::DC:
if (decompressed_bin.size() < sizeof(PSOQuestHeaderDC)) {
throw runtime_error("bin file is too small for header");
}
reinterpret_cast<PSOQuestHeaderDC*>(data_ptr)->is_download = 0x01;
break;
case GameVersion::PC:
if (decompressed_bin.size() < sizeof(PSOQuestHeaderPC)) {
throw runtime_error("bin file is too small for header");
}
reinterpret_cast<PSOQuestHeaderPC*>(data_ptr)->is_download = 0x01;
break;
case GameVersion::XB:
case GameVersion::GC:
if (decompressed_bin.size() < sizeof(PSOQuestHeaderGC)) {
throw runtime_error("bin file is too small for header");
}
reinterpret_cast<PSOQuestHeaderGC*>(data_ptr)->is_download = 0x01;
break;
case GameVersion::BB:
throw invalid_argument("PSOBB does not support download quests");
default:
throw invalid_argument("unknown game version");
}
string compressed_bin = prs_compress(decompressed_bin);
// We'll create a new Quest object with appropriately-processed .bin and .dat
// file contents.
shared_ptr<Quest> dlq(new Quest(*this));
dlq->bin_contents_ptr.reset(new string(create_download_quest_file(
compressed_bin, decompressed_bin.size())));
dlq->dat_contents_ptr.reset(new string(create_download_quest_file(
*this->dat_contents(), prs_decompress_size(*this->dat_contents()))));
return dlq;
}
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