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/*
* Copyright (c) 1998 University of Utah and the Flux Group.
* All rights reserved.
*
* This file is part of the OSKit Filesystem Reading Library, which is free
* software, also known as "open source;" you can redistribute it and/or modify
* it under the terms of the GNU General Public License (GPL), version 2, as
* published by the Free Software Foundation (FSF).
*
* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
* received a copy of the GPL along with the OSKit; see the file COPYING. If
* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
*/
#include <oskit/io/blkio.h>
#include "common.h"
struct file {
oskit_blkio_t bio;
unsigned count;
};
/*
* Query for available interfaces
*/
OSKIT_COMDECL
fsread_common_query(oskit_blkio_t *io,
const struct oskit_guid *iid,
void **out_ihandle)
{
struct file *fp = (struct file *)io;
if (memcmp(iid, &oskit_blkio_iid, sizeof(*iid)) == 0 ||
memcmp(iid, &oskit_iunknown_iid, sizeof(*iid)) == 0) {
*out_ihandle = &fp->bio;
fp->count++;
return 0;
}
return OSKIT_E_NOINTERFACE;
}
/*
* Add a reference
*/
OSKIT_COMDECL_U
fsread_common_addref(oskit_blkio_t *io)
{
struct file *fp = (struct file *)io;
return ++fp->count;
}
/*
* Return the block size for this file,
* which is always 1 because we support arbitrarily-aligned reads.
*/
OSKIT_COMDECL_U
fsread_common_getblocksize(oskit_blkio_t *io)
{
return 1;
}
OSKIT_COMDECL
fsread_common_write(oskit_blkio_t *io, const void *start, oskit_off_t offset,
oskit_size_t size, oskit_size_t *out_actual)
{
return OSKIT_E_NOTIMPL;
}
OSKIT_COMDECL
fsread_common_setsize(oskit_blkio_t *io, oskit_off_t size)
{
return OSKIT_E_NOTIMPL;
}
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