public long transferFrom(FileChannel src, final long position, final long count)
throws IOException {
if (allAreSet(state, WRITE_SHUTDOWN)) {
throw new ClosedChannelException();
}
if (count == 0L) return 0L;
final long res;
src = thread.getWorker().getXnio().unwrapFileChannel(src);
if (Native.HAS_SENDFILE && src instanceof FileChannelImpl) {
res = Native.testAndThrowRead(Native.sendfile(fd, src, position, count));
if (Native.EXTRA_TRACE) log.tracef("Sendfile(%s -> %d): %d", src, fd, res);
} else {
res = src.transferTo(position, count, new ConduitWritableByteChannel(this));
}
if (res == 0) state &= ~WRITE_READY;
checkWriteTimeout(res > 0);
return res;
}
/**
* Write a {@link DefaultFileRegion}
*
* @param region the {@link DefaultFileRegion} from which the bytes should be written
* @return amount the amount of written bytes
*/
private long doWriteFileRegion(DefaultFileRegion region, long count) throws Exception {
return Native.sendfile(fd, region, region.transfered(), count);
}