public DdrPs2FileDataTableChunk GetBound(Stream stream)
{
var cache = new CachedStream(stream);
var cacheReader = new BinaryReader(cache);
var entryCount = cacheReader.ReadInt32();
var offsets = Enumerable.Range(0, entryCount).Select(x => cacheReader.ReadInt32()).ToArray();
var lengths = Enumerable.Range(0, entryCount).Select(x => cacheReader.ReadInt32()).ToArray();
var entries = offsets.Select((e, i) => (Offset: e, Length: lengths[i])).OrderBy(x => x.Offset).ToArray();
var max = entries.Last().Use(x => x.Length + x.Offset);
cache.Rewind();
var snapshot = new SnapshotStream(cache);
snapshot.TryRead(new byte[max], 0, max);
return(new DdrPs2FileDataTableChunk
{
Data = snapshot.ToArray(),
HasHeaders = false
});
}
public DdrPs2FileDataTableChunk GetUnbound(Stream stream)
{
var cache = new CachedStream(stream);
var cacheReader = new BinaryReader(cache);
using var snapshot = new SnapshotStream(cache);
var snapshotReader = new BinaryReader(snapshot);
var firstFile = snapshotReader.ReadInt32();
var tableSize = firstFile / 4 * 4;
var table = Enumerable.Range(0, firstFile / 4).Select(_ => snapshotReader.ReadInt32()).ToArray();
var skip = firstFile - tableSize;
int index;
if (skip > 0)
{
snapshotReader.ReadBytes(skip);
}
for (index = 1; index < table.Length; index++)
{
if (table[index] < table[index - 1])
{
break;
}
}
// Warning: big heckin' hack.
// We're looking for a TCB table, which puts headers on all the file entries.
// There's no way to tell easily outside of this function, so...
var prevPosition = cache.Position;
cache.Position = table[0];
var headTest0 = cacheReader.ReadInt32();
var headTest1 = cacheReader.ReadInt32();
var headTest2 = cacheReader.ReadInt32();
var hasHeaders = headTest0 > 0 && headTest1 > 0 && headTest2 > 0 &&
headTest2 > headTest1 && headTest1 > headTest0 &&
(headTest0 & 0x3) == 0 &&
((headTest0 | headTest1 | headTest2) >> 24) == 0;
cache.Position = prevPosition;
var desiredPosition = table[index - 1];
snapshotReader.ReadBytes((int)(desiredPosition - prevPosition));
if (hasHeaders)
{
snapshotReader.ReadBytes(0xC);
}
try
{
_bemaniLzDecoder.Decode(snapshot);
}
catch (Exception)
{
return(null);
}
return(new DdrPs2FileDataTableChunk
{
Data = snapshot.ToArray(),
HasHeaders = hasHeaders
});
}
