public bool OpenFile(string fileName)
{
fileStream = File.Open(fileName, FileMode.Open);
reader = new BinaryReader(fileStream);
uint version = reader.ReadUInt32();
root = new Node();
root.Start = 4;
if (reader.ReadByte() == Constants.NodeStart)
{
return ParseNode(root);
}
else
{
return false;
}
}
private bool ParseNode(Node node)
{
Node currentNode = node;
int val;
while (true)
{
// read node type
val = fileStream.ReadByte();
if (val != -1)
{
currentNode.Type = val;
bool setPropSize = false;
while (true)
{
// search child and next node
val = fileStream.ReadByte();
if (val == -1)
{
break;
}
else if (val == Constants.NodeStart)
{
Node childNode = new Node();
childNode.Start = fileStream.Position;
setPropSize = true;
currentNode.PropsSize = fileStream.Position - currentNode.Start - 2;
currentNode.Child = childNode;
if (!ParseNode(childNode))
{
return false;
}
}
else if (val == Constants.NodeEnd)
{
if (!setPropSize)
{
currentNode.PropsSize = fileStream.Position - currentNode.Start - 2;
}
val = fileStream.ReadByte();
if (val != -1)
{
if (val == Constants.NodeStart)
{
// start next node
Node nextNode = new Node();
nextNode.Start = fileStream.Position;
currentNode.Next = nextNode;
currentNode = nextNode;
break;
}
else if (val == Constants.NodeEnd)
{
// up 1 level and move 1 position back
// safeTell(pos) && safeSeek(pos)
fileStream.Seek(-1, SeekOrigin.Current);
return true;
}
else
{
// bad format
return false;
}
}
else
{
// end of file?
return true;
}
}
else if (val == Constants.Escape)
{
fileStream.ReadByte();
}
}
}
else
{
return false;
}
}
}
public bool GetProps(Node node, out PropertyReader props)
{
long size;
byte[] buff = GetProps(node, out size);
if (buff == null)
{
props = null;
return false;
}
else
{
props = new PropertyReader(new MemoryStream(buff, 0, (int)size));
return true;
}
}
private byte[] GetProps(Node node, out long size)
{
if (buffer == null || buffer.Length < node.PropsSize)
{
buffer = new byte[node.PropsSize];
}
fileStream.Seek(node.Start + 1, SeekOrigin.Begin);
fileStream.Read(buffer, 0, (int)node.PropsSize);
uint j = 0;
bool escaped = false;
for (uint i = 0; i < node.PropsSize; ++i, ++j)
{
if (buffer[i] == Constants.Escape)
{
++i;
buffer[j] = buffer[i];
escaped = true;
}
else if (escaped)
{
buffer[j] = buffer[i];
}
}
size = j;
return buffer;
}
