/// <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 langref="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 (Asf.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);
}
}
