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add findings from psox disassembly

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This commit is contained in:
Martin Michelsen
2022-07-25 22:06:53 -07:00
parent d61c65cf16
commit ec205062ad
26 changed files with 1124 additions and 642 deletions
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src/Quest.cc
+12 -8
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@@ -112,6 +112,8 @@ struct PSOQuestHeaderPC {
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;
@@ -248,6 +250,7 @@ Quest::Quest(const string& bin_filename)
{"pc", GameVersion::PC},
{"gc", GameVersion::GC},
{"gc3", GameVersion::GC},
{"xb", GameVersion::XB},
{"bb", GameVersion::BB},
});
this->version = name_to_version.at(tokens[1]);
@@ -290,6 +293,7 @@ Quest::Quest(const string& bin_filename)
break;
}
case GameVersion::XB:
case GameVersion::GC: {
if (this->category == QuestCategory::EPISODE_3) {
// these all appear to be the same size
@@ -467,12 +471,11 @@ string Quest::decode_dlq(const string& filename) {
data = read_all(f.get());
}
PSOPCEncryption encr(key);
// The compressed data size does not need to be a multiple of 4, but the PC
// 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);
@@ -583,15 +586,15 @@ pair<string, string> Quest::decode_qst(const string& filename) {
// the first 4 bytes in the file:
// - BB: 58 00 44 00
// - PC: 3C ?? 44 00
// - DC/GC: 44 ?? 3C 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_GC_44_A6>(f.get());
return decode_qst_t<PSOCommandHeaderPC, S_OpenFile_PC_V3_44_A6>(f.get());
} else if ((signature & 0xFF00FFFF) == 0x44003C00) {
return decode_qst_t<PSOCommandHeaderDCGC, S_OpenFile_PC_GC_44_A6>(f.get());
return decode_qst_t<PSOCommandHeaderDCV3, S_OpenFile_PC_V3_44_A6>(f.get());
} else {
throw runtime_error("invalid qst file format");
}
@@ -681,11 +684,11 @@ static string create_download_quest_file(const string& compressed_data,
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 must be a multiple of 4 for PSO V2 encryption.
size_t original_size = data.size();
data.resize((data.size() + 3) & (~3));
PSOPCEncryption encr(encryption_seed);
PSOV3Encryption encr(encryption_seed);
encr.encrypt(data.data() + sizeof(PSODownloadQuestHeader),
data.size() - sizeof(PSODownloadQuestHeader));
data.resize(original_size);
@@ -715,6 +718,7 @@ shared_ptr<Quest> Quest::create_download_quest() const {
}
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");