public IList <DdrDatabaseEntry> Decode(ReadOnlySpan <byte> database)
{
var offset = 0;
var length = database.Length;
var result = new List <DdrDatabaseEntry>();
var shortNameOffsets = new Dictionary <int, int>();
var longNameOffsets = new Dictionary <int, int>();
var index = 0;
// Read database entries
while (offset < length)
{
var raw = database.Slice(offset, 0x80);
var id = Encodings.CP437.GetStringWithoutNulls(raw.Slice(0x00, 5));
if (id == string.Empty)
{
break;
}
var entry = new DdrDatabaseEntry
{
Index = index,
Id = id,
Type = raw[0x06],
CdTitle = raw[0x07],
InternalId = Bitter.ToInt16(raw, 0x08),
MaxBpm = Bitter.ToInt16(raw, 0x10),
MinBpm = Bitter.ToInt16(raw, 0x12),
Unknown014 = Bitter.ToInt16(raw, 0x14),
SonglistOrder = Bitter.ToInt16(raw, 0x16),
UnlockNumber = Bitter.ToInt16(raw, 0x18),
Difficulties = new[]
{
raw[0x1C] & 0xF,
raw[0x1C] >> 4,
raw[0x1D] & 0xF,
raw[0x1D] >> 4,
raw[0x20] & 0xF,
raw[0x20] >> 4,
raw[0x21] & 0xF,
raw[0x21] >> 4,
},
Unknown01E = Bitter.ToInt16(raw, 0x1E),
Unknown022 = Bitter.ToInt16(raw, 0x22),
Flags = Bitter.ToInt32(raw, 0x24),
Radar0 = Bitter.ToInt16Array(raw, 0x28, 8),
Radar1 = Bitter.ToInt16Array(raw, 0x38, 8),
Radar2 = Bitter.ToInt16Array(raw, 0x48, 8),
Radar3 = Bitter.ToInt16Array(raw, 0x58, 8),
Radar4 = Bitter.ToInt16Array(raw, 0x68, 8)
};
longNameOffsets[index] = Bitter.ToInt32(raw, 0x78);
shortNameOffsets[index] = Bitter.ToInt32(raw, 0x7C);
result.Add(entry);
offset += 0x80;
index++;
}
offset += 0x80;
// Read string table
var strings = database.Slice(offset);
foreach (var kv in longNameOffsets)
{
result[kv.Key].LongName = Encodings.CP437.GetStringWithoutNulls(strings.Slice(kv.Value));
}
foreach (var kv in shortNameOffsets)
{
result[kv.Key].ShortName = Encodings.CP437.GetStringWithoutNulls(strings.Slice(kv.Value));
}
return(result);
}