public void Write(BinaryBuffer buf)
{
buf.Write(collectionCounts.Count);
foreach (var i in collectionCounts)
{
buf.Write(i);
}
buf.Write(fieldSizes.Count);
foreach (var i in fieldSizes)
{
buf.Write(i);
}
fieldSizes.Clear();
//Guid crumb, so we can jump to the guid table on read
var guidCrumbPosition = buf.position;
buf.position += 5;
//Type table
//At this point includes only node types, which we iterate through adding fields type ids
var keys = new Type[typeToLocalID.Count];
typeToLocalID.Keys.CopyTo(keys, 0);
buf.Write(keys.Length);
foreach (var type in keys)
{
var metaNode = NodeBindings.GetBindings(type);
buf.Write(metaNode.fields.Length);
foreach (var field in metaNode.fields)
{
var typeUnits = TypeUnitUtility.GetTypeUnits(field.type);
buf.Write(typeUnits.Length);
foreach (var subType in typeUnits)
{
WriteLocalID(buf, subType);
}
}
}
//Guids
var currentPosition = buf.position;
buf.position = guidCrumbPosition;
buf.Write(currentPosition);
buf.position = currentPosition;
buf.Write(typeToLocalID.Count);
foreach (var pair in typeToLocalID)
{
buf.Write(DeltaCore.GetGUID(pair.Key));
}
typeToLocalID.Clear();
}
//Parse type metadata in the footer so we can avoid indexing fields that no longer exist
public void Read(BinaryBuffer buf)
{
collectionCounts.Clear();
var collectionCountCount = buf.ReadInt();
for (int i = 0; i < collectionCountCount; i++)
{
collectionCounts.Push(buf.ReadInt());
}
fieldSizes.Clear();
var fieldSizesCount = buf.ReadInt();
for (int i = 0; i < fieldSizesCount; i++)
{
fieldSizes.Enqueue(buf.ReadInt());
}
//Guids
var typeTablePosition = buf.position + 5;
buf.position = buf.ReadInt(); //Jump to guid table
localIDToGuid.Clear();
var numGuids = buf.ReadInt();
for (int iGuid = 0; iGuid < numGuids; iGuid++)
{
localIDToGuid.Add(buf.ReadGuid());
}
var currentPosition = buf.position;
//Jump back to type table
buf.position = typeTablePosition;
fieldTypeMatchTable.Clear();
var numNodeTypes = buf.ReadInt();
for (int localID = 0; localID < numNodeTypes; localID++)
{
var type = DeltaCore.Get <Type>(localIDToGuid[localID]);
var metaNode = NodeBindings.GetBindings(type);
var oldFieldCount = buf.ReadInt();
var currentFieldCount = metaNode.fields.Length;
var fieldTypeMatches = new bool[Math.Max(oldFieldCount, currentFieldCount)];
fieldTypeMatchTable.Add(fieldTypeMatches);
for (int iField = 0; iField < fieldTypeMatches.Length; iField++)
{
if (iField >= oldFieldCount)
{
continue;
}
var oldSubTypeLength = buf.ReadInt();
var currentTypeUnits = TypeUnitUtility.GetTypeUnits(metaNode.fields[iField].type);
var matches = true;
if (oldSubTypeLength != currentTypeUnits.Length)
{
matches = false;
}
for (int iTypeUnit = 0; iTypeUnit < oldSubTypeLength; iTypeUnit++)
{
var currentGUID = DeltaCore.GetGUID(currentTypeUnits[iTypeUnit]);
var previousGUID = localIDToGuid[buf.ReadInt()];
if (currentGUID != previousGUID)
{
matches = false;
}
}
fieldTypeMatches[iField] = matches;
}
}
buf.position = currentPosition;
}