public Stream GetFileStream(int tag, int level, int x, int y)
{
entry = new DirectoryEntry(tag, level, x, y, 0, 0);
UInt32 index = entry.ComputeHash() % (UInt32)(header.HashBuckets);
long hep = GetHashEntryPosition(index);
DirectoryEntry de;
while (hep != 0)
{
de = GetDirectoryEntry(hep);
if ((de.x == x) && (de.y == y) && ((de.tag == tag) || (tag == -1)) && (de.level == level))
{
return(StreamSlice.Create(dataStream, de.location, de.size));
}
else
{
hep = de.NextEntryInChain;
}
}
return(null);
}
public static async Task <Stream> GetImageStreamAsync(Stream f, int level, int x, int y, CancellationToken token)
{
var offset = GetFileIndexOffset(level, x, y);
f.Seek(offset, SeekOrigin.Begin);
var(start, length) = await GetNodeInfoAsync(f, offset, token).ConfigureAwait(false);
return(StreamSlice.Create(f, start, length));
}