private void Read(Stream stream)
{
this.Signature = GifHelpers.ReadString(stream, 3);
if (this.Signature != "GIF")
{
throw GifHelpers.InvalidSignatureException(this.Signature);
}
this.Version = GifHelpers.ReadString(stream, 3);
if (this.Version != "87a" && this.Version != "89a")
{
throw GifHelpers.UnsupportedVersionException(this.Version);
}
this.LogicalScreenDescriptor = GifLogicalScreenDescriptor.ReadLogicalScreenDescriptor(stream);
}
