private void ReadRegions(Resource rsrc)
{
UInt32 regions = reader.ReadUInt32();
for (UInt32 i = 0; i < regions; i++)
{
UInt32 regionNameId = reader.ReadUInt32();
UInt32 regionOffset = reader.ReadUInt32();
Region rgn = new Region();
rgn.RegionName = staticStrings[regionNameId];
var lastRegionPos = stream.Position;
stream.Seek(regionOffset, SeekOrigin.Begin);
ReadNode(rgn);
rsrc.Regions[rgn.RegionName] = rgn;
stream.Seek(lastRegionPos, SeekOrigin.Begin);
}
}
public Resource Read()
{
using (this.reader = XmlReader.Create(stream))
{
Resource rsrc = new Resource();
Region currentRegion = null;
List<Node> stack = new List<Node>();
while (reader.Read())
{
if (reader.NodeType == XmlNodeType.Element)
{
switch (reader.Name)
{
case "save":
// Root element
if (stack.Count() > 0)
throw new InvalidFormatException("Node <save> was unexpected.");
break;
case "header":
// LSX metadata part 1
string version = reader["version"];
if (version != InitialVersion && version != CurrentVersion)
throw new InvalidFormatException(String.Format("Unsupported LSX version; expected {0}, found {1}", CurrentVersion, version));
rsrc.Metadata.timestamp = Convert.ToUInt64(reader["timestamp"]);
break;
case "version":
// LSX metadata part 2
rsrc.Metadata.majorVersion = Convert.ToUInt32(reader["major"]);
rsrc.Metadata.minorVersion = Convert.ToUInt32(reader["minor"]);
rsrc.Metadata.revision = Convert.ToUInt32(reader["revision"]);
rsrc.Metadata.buildNumber = Convert.ToUInt32(reader["build"]);
break;
case "region":
if (currentRegion != null)
throw new InvalidFormatException("A <region> can only start at the root level of a resource.");
Debug.Assert(!reader.IsEmptyElement);
var region = new Region();
region.RegionName = reader["id"];
Debug.Assert(region.RegionName != null);
rsrc.Regions.Add(region.RegionName, region);
currentRegion = region;
break;
case "node":
if (currentRegion == null)
throw new InvalidFormatException("A <node> must be located inside a region.");
Node node;
if (stack.Count() == 0)
{
// The node is the root node of the region
node = currentRegion;
}
else
{
// New node under the current parent
node = new Node();
node.Parent = stack.Last();
}
node.Name = reader["id"];
Debug.Assert(node.Name != null);
if (node.Parent != null)
node.Parent.AppendChild(node);
if (!reader.IsEmptyElement)
stack.Add(node);
break;
case "attribute":
var attrTypeId = Convert.ToUInt32(reader["type"]);
var attrName = reader["id"];
var attrValue = reader["value"];
if (attrTypeId > (int)NodeAttribute.DataType.DT_Max)
throw new InvalidFormatException(String.Format("Unsupported attribute data type: {0}", attrTypeId));
Debug.Assert(attrName != null);
Debug.Assert(attrValue != null);
var attr = new NodeAttribute((NodeAttribute.DataType)attrTypeId);
attr.FromString(attrValue);
if (attr.Type == NodeAttribute.DataType.DT_TranslatedString)
{
((TranslatedString)attr.Value).Handle = reader["handle"];
Debug.Assert(((TranslatedString)attr.Value).Handle != null);
}
stack.Last().Attributes.Add(attrName, attr);
break;
case "children":
// Child nodes are handled in the "node" case
break;
default:
throw new InvalidFormatException(String.Format("Unknown element encountered: {0}", reader.Name));
}
}
else if (reader.NodeType == XmlNodeType.EndElement)
{
switch (reader.Name)
{
case "save":
case "header":
case "version":
case "attribute":
case "children":
// These elements don't change the stack, just discard them
break;
case "region":
Debug.Assert(stack.Count == 0);
Debug.Assert(currentRegion != null);
Debug.Assert(currentRegion.Name != null);
currentRegion = null;
break;
case "node":
stack.RemoveAt(stack.Count - 1);
break;
default:
throw new InvalidFormatException(String.Format("Unknown element encountered: {0}", reader.Name));
}
}
}
return rsrc;
}
}
