/// <summary>
/// Constructs and initializes a new instance of <see
/// cref="HeaderExtensionObject" /> by reading the contents
/// from a specified position in a specified file.
/// </summary>
/// <param name="file">
/// A <see cref="Asf.File" /> object containing the file from
/// which the contents of the new instance are to be read.
/// </param>
/// <param name="position">
/// A <see cref="long" /> value specify at what position to
/// read the object.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="file" /> is <see langword="null" />.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="position" /> is less than zero or greater
/// than the size of the file.
/// </exception>
/// <exception cref="CorruptFileException">
/// The object read from disk does not have the correct GUID
/// or contents.
/// </exception>
public HeaderExtensionObject(File file, long position)
: base(file, position)
{
if (!Guid.Equals(Asf.Guid.AsfHeaderExtensionObject))
{
throw new CorruptFileException("Object GUID incorrect.");
}
if (file.ReadGuid() != Asf.Guid.AsfReserved1)
{
throw new CorruptFileException("Reserved1 GUID expected.");
}
if (file.ReadWord() != 6)
{
throw new CorruptFileException("Invalid reserved WORD. Expected '6'.");
}
uint size_remaining = file.ReadDWord();
position += 0x170 / 8;
while (size_remaining > 0)
{
Object obj = file.ReadObject(position);
position += (long)obj.OriginalSize;
size_remaining -= (uint)obj.OriginalSize;
children.Add(obj);
}
}