/**
* Load the block at the given offset.
*/
public override ByteBuffer GetBlockAt(int offset)
{
// Which big block is this?
int byteOffset = offset * POIFSConstants.SMALL_BLOCK_SIZE;
int bigBlockNumber = byteOffset / _filesystem.GetBigBlockSize();
int bigBlockOffset = byteOffset % _filesystem.GetBigBlockSize();
// Now locate the data block for it
StreamBlockByteBufferIterator it = _mini_stream.GetBlockIterator() as StreamBlockByteBufferIterator;
for (int i = 0; i < bigBlockNumber; i++)
{
it.Next();
}
ByteBuffer dataBlock = it.Next();
if (dataBlock == null)
{
throw new IndexOutOfRangeException("Big block " + bigBlockNumber + " outside stream");
}
// Position ourselves, and take a slice
dataBlock.Position = dataBlock.Position + bigBlockOffset;
ByteBuffer miniBuffer = dataBlock.Slice();
miniBuffer.Limit = POIFSConstants.SMALL_BLOCK_SIZE;
return(miniBuffer);
}
public IEnumerator <ByteBuffer> GetBlockIterator()
{
if (Size > 0)
{
return(_stream.GetBlockIterator());
}
else
{
//List<byte[]> empty = Collections.emptyList();
List <ByteBuffer> empty = new List <ByteBuffer>();
return(empty.GetEnumerator());
}
}