void NoteLoaderOM::LoadObjectsFromFile(GString filename, GString prefix, Song *Out)
{
#if (!defined _WIN32) || (defined STLP)
std::ifstream filein (filename.c_str());
#else
std::ifstream filein (Utility::Widen(filename).c_str());
#endif
std::regex versionfmt("osu file format v(\\d+)");
if (!filein.is_open())
throw std::exception("Could not open file.");
auto Diff = make_shared<Difficulty>();
OsuLoadInfo Info;
Info.TimingInfo = make_shared<OsuManiaTimingInfo>();
Info.OsuSong = Out;
Info.SliderVelocity = 1.4;
Info.Diff = Diff;
Info.last_sound_index = 1;
Diff->Data = make_shared<DifficultyLoadInfo>();
Diff->Data->TimingInfo = Info.TimingInfo;
// osu! stores bpm information as the time in ms that a beat lasts.
Diff->BPMType = Difficulty::BT_BEATSPACE;
Out->SongDirectory = prefix;
Diff->Filename = filename;
Out->SongDirectory = prefix + "/";
/*
Just like BMS, osu!mania charts have timing data separated by files
and a set is implied using folders.
*/
GString Line;
getline(filein, Line);
int version = -1;
std::smatch sm;
// "search" was picked instead of "match" since a line can have a bunch of
// junk before the version declaration
if (regex_search(Line.cbegin(), Line.cend(), sm, versionfmt))
version = atoi(sm[1].str().c_str());
else
throw std::exception("Invalid .osu file.");
// "osu file format v"
if (version < 10) // why
throw std::exception(Utility::Format("Unsupported osu! file version (%d < 10)", version).c_str());
Info.Version = version;
osuReadingMode ReadingMode = RNotKnown, ReadingModeOld = RNotKnown;
try {
while (filein)
{
Info.Line++;
getline(filein, Line);
Utility::ReplaceAll(Line, "\r", "");
if (!Line.length())
continue;
SetReadingMode(Line, ReadingMode);
if (ReadingMode != ReadingModeOld || ReadingMode == RNotKnown) // Skip this line since it changed modes, or it's not a valid section yet
{
if (ReadingModeOld == RTiming)
stable_sort(Info.HitsoundSections.begin(), Info.HitsoundSections.end());
if (ReadingModeOld == RGeneral)
if (!Info.ReadAModeTag)
throw std::exception("Not an osu!mania chart.");
ReadingModeOld = ReadingMode;
continue;
}
switch (ReadingMode)
{
case RGeneral:
if (!ReadGeneral(Line, &Info)) // don't load charts that we can't work with
{
throw std::exception("osu! file unusable on raindrop.");
}
break;
case RMetadata: ReadMetadata(Line, &Info); break;
case RDifficulty: ReadDifficulty(Line, &Info); break;
case REvents: ReadEvents(Line, &Info); break;
case RTiming: ReadTiming(Line, &Info); break;
case RHitobjects: ReadObjects(Line, &Info); break;
default: break;
}
}
if (Diff->TotalObjects)
{
// Calculate an alleged offset
Offsetize(&Info);
// Okay then, convert timing data into a measure-based format raindrop can use.
MeasurizeFromTimingData(&Info);
CopyTimingData(&Info);
// Then copy notes into these measures.
PushNotesToMeasures(&Info);
// Copy all sounds we registered
for (auto i : Info.Sounds)
Diff->SoundList[i.second] = i.first;
// Calculate level as NPS
Diff->Level = Diff->TotalScoringObjects / Diff->Duration;
Out->Difficulties.push_back(Diff);
}
} catch (std::exception &e)
{
// rethrow with line info
throw std::exception(Utility::Format("Line %d: %s", Info.Line, e.what()).c_str());
}
}
