public static Dictionary <Tkey, Tval> ReadMap <Tkey, Tval>(SpanStream r)
where Tkey : unmanaged
where Tval : unmanaged
{
// sum of bitsizes of each member
uint cardinality = r.ReadUInt32();
int numElements = r.ReadInt32();
BitSet available = new BitSet(ReadArray <UInt32>(r));
BitSet deleted = new BitSet(ReadArray <UInt32>(r));
int keySize = Marshal.SizeOf <Tkey>();
int valueSize = Marshal.SizeOf <Tval>();
Dictionary <Tkey, Tval> map = new Dictionary <Tkey, Tval>(numElements);
for (int i = 0; i < numElements; i++)
{
if (!available.Contains(i))
{
continue;
}
unsafe
{
fixed(byte *pKey = r.ReadBytes(keySize))
fixed(byte *pVal = r.ReadBytes(valueSize))
{
Tkey key = *(Tkey *)pKey;
Tval val = *(Tval *)pVal;
map.Add(key, val);
}
}
}
return(map);
}
public static T[] ReadArray <T>(SpanStream r) where T : unmanaged
{
uint numElements = r.ReadUInt32();
T[] arr = new T[numElements];
int tSize = Marshal.SizeOf <T>();
for (int i = 0; i < numElements; i++)
{
unsafe
{
fixed(byte *data = r.ReadBytes(tSize))
{
T element = *(T *)data;
arr.SetValue(element, i);
}
}
}
return(arr);
}
public static byte[] ReadBuffer(SpanStream r)
{
int numBytes = r.ReadInt32();
return(r.ReadBytes(numBytes));
}
