/// <summary>
/// Writes the tags contained in the current instance to the
/// beginning of the file that created it, overwriting the
/// existing tags.
/// </summary>
/// <returns>
/// A <see cref="long" /> value indicating the seek position
/// in the file at which the written tags end. This also
/// marks the seek position at which the media begins.
/// </returns>
public long Write()
{
ByteVector data = Render();
file.Insert(data, 0, TotalSize);
return(data.Count);
}
/// <summary>
/// Writes the tags contained in the current instance to the
/// end of the file that created it, overwriting the existing
/// tags.
/// </summary>
/// <returns>
/// A <see cref="long" /> value indicating the seek position
/// in the file at which the written tags begin. This also
/// marks the seek position at which the media ends.
/// </returns>
public long Write()
{
long total_size = TotalSize;
ByteVector data = Render();
file.Insert(data, file.Length - total_size, total_size);
return(file.Length - data.Count);
}
/// <summary>
/// Overwrites the header on disk, updating it to include a
/// change in the size of the box.
/// </summary>
/// <param name="file">
/// A <see cref="TagLibSharp.File" /> object containing the file
/// from which the box originates.
/// </param>
/// <param name="sizeChange">
/// A <see cref="long" /> value indicating the change in the
/// size of the box described by the current instance.
/// </param>
/// <returns>
/// The size change encountered by the box that parents the
/// box described the the current instance, equal to the
/// size change of the box plus any size change that should
/// happen in the header.
/// </returns>
public long Overwrite(TagLibSharp.File file, long sizeChange)
{
if (file == null)
{
throw new ArgumentNullException("file");
}
if (!from_disk)
{
throw new InvalidOperationException(
"Cannot overwrite headers not on disk.");
}
long old_header_size = HeaderSize;
DataSize += sizeChange;
file.Insert(Render(), position, old_header_size);
return(sizeChange + HeaderSize - old_header_size);
}