private int ensureBuffer() throws IOException {
if (!buffer.hasRemaining()) {
buffer.clear();
wrapped.read(buffer);
buffer.flip();
}
return buffer.remaining();
}
@Override
public int read(ByteBuffer dst) throws IOException {
requireOpen();
buffer.limit(0);
wrapped.position(position);
int read = wrapped.read(dst);
if (read > 0) {
position += read;
}
return read;
}
