1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/libfsserver/lib/generic/accessor.cc Thu Apr 15 23:15:17 2021 +0200
1.3 @@ -0,0 +1,98 @@
1.4 +/*
1.5 + * Generic accessor functionality.
1.6 + *
1.7 + * Copyright (C) 2021 Paul Boddie <paul@boddie.org.uk>
1.8 + *
1.9 + * This program is free software; you can redistribute it and/or
1.10 + * modify it under the terms of the GNU General Public License as
1.11 + * published by the Free Software Foundation; either version 2 of
1.12 + * the License, or (at your option) any later version.
1.13 + *
1.14 + * This program is distributed in the hope that it will be useful,
1.15 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.16 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.17 + * GNU General Public License for more details.
1.18 + *
1.19 + * You should have received a copy of the GNU General Public License
1.20 + * along with this program; if not, write to the Free Software
1.21 + * Foundation, Inc., 51 Franklin Street, Fifth Floor,
1.22 + * Boston, MA 02110-1301, USA
1.23 + */
1.24 +
1.25 +#include "accessor.h"
1.26 +
1.27 +#include <string.h>
1.28 +
1.29 +
1.30 +
1.31 +Accessor::Accessor(fileid_t fileid, offset_t size)
1.32 +: _size(size), fileid(fileid)
1.33 +{
1.34 +}
1.35 +
1.36 +Accessor::~Accessor()
1.37 +{
1.38 +}
1.39 +
1.40 +/* Return the size of the file. */
1.41 +
1.42 +offset_t Accessor::get_size()
1.43 +{
1.44 + return _size;
1.45 +}
1.46 +
1.47 +/* Update the size of the file. */
1.48 +
1.49 +void Accessor::set_size(offset_t size)
1.50 +{
1.51 + _size = size;
1.52 +}
1.53 +
1.54 +/* Perform any closing operation on the file. */
1.55 +
1.56 +void Accessor::close()
1.57 +{
1.58 +}
1.59 +
1.60 +/* Perform any opening operation on the file. */
1.61 +
1.62 +void Accessor::open()
1.63 +{
1.64 +}
1.65 +
1.66 +/* Data transfer methods. */
1.67 +
1.68 +void Accessor::fill(Flexpage *flexpage)
1.69 +{
1.70 + /* Filling completely beyond the end of file should produce an empty
1.71 + flexpage. This could potentially be a shared read-only flexpage that
1.72 + would be replaced by an independent writable flexpage if ever written. */
1.73 +
1.74 + if (flexpage->base_offset < _size)
1.75 + fill_populated(flexpage);
1.76 + else
1.77 + memset((void *) flexpage->base_addr, 0, flexpage->size);
1.78 +}
1.79 +
1.80 +void Accessor::flush(Flexpage *flexpage)
1.81 +{
1.82 + /* Flushing completely beyond the end of file should discard the
1.83 + flexpage. */
1.84 +
1.85 + if (flexpage->base_offset < _size)
1.86 + flush_populated(flexpage);
1.87 +}
1.88 +
1.89 +/* Data transfer helper methods. */
1.90 +
1.91 +void Accessor::fill_populated(Flexpage *flexpage)
1.92 +{
1.93 + (void) flexpage;
1.94 +}
1.95 +
1.96 +void Accessor::flush_populated(Flexpage *flexpage)
1.97 +{
1.98 + (void) flexpage;
1.99 +}
1.100 +
1.101 +// vim: tabstop=4 expandtab shiftwidth=4