static public StreamAdapterInfo Open(string filename)
{
filename = filename.ToLowerInvariant().Trim();
if (!File.Exists(filename))
{
return(null);
}
if (filename.EndsWith(@".chd"))
{
return(new StreamAdapterInfo(CHD.Load(new FileStream(filename, FileMode.Open, FileAccess.Read))));
}
if (filename.EndsWith(@".gz"))
{
var gz = new Gzip(filename);
return(new StreamAdapterInfo(gz.GetDeflateStream(), 0x7FFFFFFFFFFFL)); // stupid value to play nice with arithmetic
}
if (filename.EndsWith(@".zip"))
{
var zip = new Zip(filename);
if (zip.Files.Count > 0)
{
var file = zip.Files[0];
long length = file.UncompressedSize;
if (length == 0 && file.CompressedSize != 0)
{
length = file.CompressedSize;
}
return(new StreamAdapterInfo(zip.StreamFile(file), length));
}
}
return(new StreamAdapterInfo(new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read)));
}
