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/*
* Copyright (c) 1997-1998 University of Utah and the Flux Group.
* All rights reserved.
*
* This file is part of the Flux OSKit. The OSKit 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). To explore alternate licensing terms, contact
* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
*
* 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.
*/
/*
* Definitions of a simple wrapper that can be used to protect oskit_stream
* interfaces.
*/
#include <oskit/com/stream.h>
#include <oskit/com/wrapper.h>
#include <oskit/c/stdlib.h>
typedef struct {
oskit_stream_t ioi; /* COM interface being exported */
int count; /* reference count */
oskit_stream_t *wrapped; /* COM interface being wrapped */
void (*before)(void *);
void (*after)(void *);
void *cookie;
} streamwrap_impl_t;
#define WRAPPERCALL(impl, call, args...) ({ \
oskit_error_t __err; \
impl->before(impl->cookie); \
__err = oskit_stream_##call(impl->wrapped ,##args); \
impl->after(impl->cookie); \
__err; })
#define WRAPPERCALL_NOARGS(impl, call) ({ \
oskit_error_t __err; \
impl->before(impl->cookie); \
__err = oskit_stream_##call(impl->wrapped); \
impl->after(impl->cookie); \
__err; })
static OSKIT_COMDECL
stream_query(oskit_stream_t *f, const struct oskit_guid *iid,
void **out_ihandle)
{
streamwrap_impl_t *b = (streamwrap_impl_t *)f;
if (memcmp(iid, &oskit_iunknown_iid, sizeof(*iid)) == 0 ||
memcmp(iid, &oskit_stream_iid, sizeof(*iid)) == 0) {
*out_ihandle = &b->ioi;
b->before(b->cookie);
++b->count;
b->after(b->cookie);
return 0;
}
*out_ihandle = NULL;
return OSKIT_E_NOINTERFACE;
}
static OSKIT_COMDECL_U
stream_addref(oskit_stream_t *f)
{
streamwrap_impl_t *b = (streamwrap_impl_t *)f;
unsigned newcount;
b->before(b->cookie);
newcount = ++b->count;
b->after(b->cookie);
return newcount;
}
static OSKIT_COMDECL_U
stream_release(oskit_stream_t *f)
{
streamwrap_impl_t *b = (streamwrap_impl_t *)f;
unsigned newcount;
b->before(b->cookie);
if ((newcount = --b->count) == 0) {
oskit_stream_release(b->wrapped);
b->after(b->cookie);
free(b);
} else
b->after(b->cookie);
return newcount;
}
/*******************************************************/
/******* Implementation of the oskit_stream_t if *******/
/*******************************************************/
static OSKIT_COMDECL
stream_read(oskit_stream_t *f, void *buf, oskit_u32_t len,
oskit_u32_t *out_actual)
{
streamwrap_impl_t *s = (streamwrap_impl_t *)f;
oskit_error_t err;
err = WRAPPERCALL(s, read, buf, len, out_actual);
return err;
}
static OSKIT_COMDECL
stream_write(oskit_stream_t *f, const void *buf,
oskit_u32_t len, oskit_u32_t *out_actual)
{
streamwrap_impl_t *s = (streamwrap_impl_t *)f;
oskit_error_t err;
err = WRAPPERCALL(s, write, buf, len, out_actual);
return err;
}
static OSKIT_COMDECL
stream_seek(oskit_stream_t *f, oskit_s64_t ofs,
oskit_seek_t whence, oskit_u64_t *out_newpos)
{
streamwrap_impl_t *s = (streamwrap_impl_t *)f;
oskit_error_t err;
err = WRAPPERCALL(s, seek, ofs, whence, out_newpos);
return err;
}
static OSKIT_COMDECL
stream_setsize(oskit_stream_t *f, oskit_u64_t new_size)
{
streamwrap_impl_t *s = (streamwrap_impl_t *)f;
oskit_error_t err;
err = WRAPPERCALL(s, setsize, new_size);
return err;
}
static OSKIT_COMDECL
stream_copyto(oskit_stream_t *f, oskit_stream_t *dst,
oskit_u64_t size,
oskit_u64_t *out_read,
oskit_u64_t *out_written)
{
streamwrap_impl_t *s = (streamwrap_impl_t *)f;
oskit_error_t err;
err = WRAPPERCALL(s, copyto,
dst, size, out_read, out_written);
return err;
}
static OSKIT_COMDECL
stream_commit(oskit_stream_t *f, oskit_u32_t commit_flags)
{
streamwrap_impl_t *s = (streamwrap_impl_t *)f;
oskit_error_t err;
err = WRAPPERCALL(s, commit, commit_flags);
return err;
}
static OSKIT_COMDECL
stream_revert(oskit_stream_t *f)
{
streamwrap_impl_t *s = (streamwrap_impl_t *)f;
oskit_error_t err;
err = WRAPPERCALL_NOARGS(s, revert);
return err;
}
static OSKIT_COMDECL
stream_lock_region(oskit_stream_t *f,
oskit_u64_t offset, oskit_u64_t size, oskit_u32_t lock_type)
{
streamwrap_impl_t *s = (streamwrap_impl_t *)f;
oskit_error_t err;
err = WRAPPERCALL(s, lockregion, offset, size, lock_type);
return err;
}
static OSKIT_COMDECL
stream_unlock_region(oskit_stream_t *f,
oskit_u64_t offset, oskit_u64_t size, oskit_u32_t lock_type)
{
streamwrap_impl_t *s = (streamwrap_impl_t *)f;
oskit_error_t err;
err = WRAPPERCALL(s, unlockregion, offset, size, lock_type);
return err;
}
static OSKIT_COMDECL
stream_stat(oskit_stream_t *f, oskit_stream_stat_t *out_stat,
oskit_u32_t stat_flags)
{
streamwrap_impl_t *s = (streamwrap_impl_t *)f;
oskit_error_t err;
err = WRAPPERCALL(s, stat, out_stat, stat_flags);
return err;
}
static OSKIT_COMDECL
stream_clone(oskit_stream_t *f, oskit_stream_t **out_stream)
{
streamwrap_impl_t *s = (streamwrap_impl_t *)f;
oskit_error_t err;
oskit_stream_t *out;
err = WRAPPERCALL(s, clone, &out);
if (err == 0) {
err = oskit_wrap_stream(out, s->before, s->after, s->cookie,
out_stream);
oskit_stream_release(out);
}
return err;
}
/***************************************************************************/
/*
* vtables for interfaces exported by streams
*/
static struct oskit_stream_ops streamops =
{
stream_query,
stream_addref,
stream_release,
stream_read,
stream_write,
stream_seek,
stream_setsize,
stream_copyto,
stream_commit,
stream_revert,
stream_lock_region,
stream_unlock_region,
stream_stat,
stream_clone
};
/*
* Wrap a stream_t in before/after brackets.
*/
oskit_error_t
oskit_wrap_stream(oskit_stream_t *in,
void (*before)(void *), void (*after)(void *), void *cookie,
oskit_stream_t **out)
{
streamwrap_impl_t *newsi = malloc(sizeof(*newsi));
if (newsi == NULL)
return OSKIT_ENOMEM;
newsi->count = 1;
newsi->ioi.ops = &streamops;
newsi->wrapped = in;
oskit_stream_addref(in);
newsi->before = before;
newsi->after = after;
newsi->cookie = cookie;
*out = &newsi->ioi;
return 0;
}
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