ObjFW  Diff

- (size_t)_readNBytes: (size_t)size
	   intoBuffer: (char*)buf
{
	size_t ret;

	if (fd == -1 || eos)
		@throw [OFReadFailedException newWithClass: isa
						      size: size];
					     requestedSize: size];
	if ((ret = read(fd, buf, size)) == 0)
		eos = YES;

	return ret;
}

- (size_t)_writeNBytes: (size_t)size
	    fromBuffer: (const char*)buf
{
	size_t ret;

	if (fd == -1 || eos || (ret = write(fd, buf, size)) < size)
		@throw [OFWriteFailedException newWithClass: isa
						       size: size];
					      requestedSize: size];

	return ret;
}

- (void)_seekToOffset: (off_t)offset
{
	if (lseek(fd, offset, SEEK_SET) == -1)