static void UpdateMetadata(NativeMetadataIterator iterator, NativeVorbisCommentBlock newComments, NativePictureBlock newPicture)
{
Contract.Requires(iterator != null);
Contract.Requires(newComments != null);
var metadataInserted = false;
var pictureInserted = false;
do
{
switch ((MetadataType)Marshal.ReadInt32(iterator.GetBlock()))
{
// Replace the existing Vorbis comment:
case MetadataType.VorbisComment:
if (!iterator.DeleteBlock(false))
{
throw new IOException(Resources.MetadataEncoderDeleteError);
}
if (!iterator.InsertBlockAfter(newComments.Handle))
{
throw new IOException(Resources.MetadataEncoderInsertBlockError);
}
metadataInserted = true;
break;
// Replace the existing Picture block:
case MetadataType.Picture:
if (!iterator.DeleteBlock(false))
{
throw new IOException(Resources.MetadataEncoderDeleteError);
}
if (newPicture != null && !iterator.InsertBlockAfter(newPicture.Handle))
{
throw new IOException(Resources.MetadataEncoderInsertBlockError);
}
pictureInserted = true;
break;
// Delete any padding:
case MetadataType.Padding:
if (!iterator.DeleteBlock(false))
{
throw new IOException(Resources.MetadataEncoderDeleteError);
}
break;
}
} while (iterator.Next());
// If there was no existing metadata block to replace, insert it now:
if (!metadataInserted && !iterator.InsertBlockAfter(newComments.Handle))
{
throw new IOException(Resources.MetadataEncoderInsertBlockError);
}
// If there was no existing picture block to replace, and a new one is available, insert it now:
if (newPicture != null && !pictureInserted && !iterator.InsertBlockAfter(newPicture.Handle))
{
throw new IOException(Resources.MetadataEncoderInsertBlockError);
}
newComments.ReleaseHandleOwnership();
newPicture?.ReleaseHandleOwnership();
}
