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make another pass over command documentation

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This commit is contained in:
Martin Michelsen
2022-05-09 22:11:19 -07:00
parent 2f72eb5a3c
commit a11b9f5b3e
5 changed files with 337 additions and 192 deletions
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src/Quest.cc
+20 -12
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@@ -652,22 +652,27 @@ vector<shared_ptr<const Quest>> QuestIndex::filter(GameVersion version,
static string create_download_quest_file(const string& compressed_data,
size_t decompressed_size, uint32_t seed = 0) {
if (seed == 0) {
seed = random_object<uint32_t>();
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 = seed;
header->encryption_seed = encryption_seed;
data += compressed_data;
// Add temporary extra bytes if necessary so encryption won't fail
// 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));
PSOPCEncryption encr(seed);
PSOPCEncryption encr(encryption_seed);
encr.encrypt(data.data() + sizeof(PSODownloadQuestHeader),
data.size() - sizeof(PSODownloadQuestHeader));
data.resize(original_size);
@@ -676,10 +681,13 @@ static string create_download_quest_file(const string& compressed_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());
// 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.
void* data_ptr = decompressed_bin.data();
switch (this->version) {
case GameVersion::DC:
@@ -706,14 +714,14 @@ shared_ptr<Quest> Quest::create_download_quest() const {
throw invalid_argument("unknown game version");
}
shared_ptr<Quest> dlq(new Quest(*this));
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;
}