static Stream GetDecodedStream(
XmlElement xmlRoot,
TiledCompression compression)
{
var rawData = Convert.FromBase64String(xmlRoot.InnerText);
switch (compression)
{
case TiledCompression.Gzip:
return(new GZipStream(
new MemoryStream(rawData, false),
CompressionMode.Decompress));
case TiledCompression.Zlib:
{
var data = new byte[rawData.Length - 6];
Array.Copy(rawData, 2, data, 0, data.Length);
return(new DeflateStream(
new MemoryStream(data, false),
CompressionMode.Decompress));
}
default:
throw new Exception("Unrecognizable compression type.");
}
}
static void ReadTileMap(XmlElement xmlRoot, int[] gidMap, TiledCompression compression)
{
var encoding = xmlRoot.AttrToString("encoding");
if (encoding == "base64")
{
using (var stream = GetDecodedStream(xmlRoot, compression))
{
using (var reader = new BinaryReader(stream))
{
const uint horizontal = 0x80000000;
const uint vertical = 0x40000000;
const uint diagonal = 0x20000000;
for (int i = 0; i < gidMap.Length; i++)
{
var ugid = reader.ReadUInt32();
ugid &= ~(horizontal | vertical | diagonal);
gidMap[i] = (int)ugid;
}
}
}
}
}
