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/* tvbuff_real.c
*
* Copyright (c) 2000 by Gilbert Ramirez <gram@alumni.rice.edu>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include "tvbuff.h"
#include "tvbuff-int.h"
#include "proto.h" /* XXX - only used for DISSECTOR_ASSERT, probably a new header file? */
#include "exceptions.h"
struct tvb_real {
struct tvbuff tvb;
/** Func to call when actually freed */
tvbuff_free_cb_t free_cb;
};
static void
real_free(tvbuff_t *tvb)
{
struct tvb_real *real_tvb = (struct tvb_real *) tvb;
if (real_tvb->free_cb) {
/*
* XXX - do this with a union?
*/
real_tvb->free_cb((gpointer)tvb->real_data);
}
}
static guint
real_offset(const tvbuff_t *tvb _U_, const guint counter)
{
return counter;
}
static const struct tvb_ops tvb_real_ops = {
sizeof(struct tvb_real), /* size */
real_free, /* free */
real_offset, /* offset */
NULL, /* get_ptr */
NULL, /* memcpy */
NULL, /* find_guint8 */
NULL, /* pbrk_guint8 */
NULL, /* clone */
};
tvbuff_t *
tvb_new_real_data(const guint8* data, const guint length, const gint reported_length)
{
tvbuff_t *tvb;
struct tvb_real *real_tvb;
THROW_ON(reported_length < -1, ReportedBoundsError);
tvb = tvb_new(&tvb_real_ops);
tvb->real_data = data;
tvb->length = length;
tvb->reported_length = reported_length;
tvb->contained_length = reported_length;
tvb->initialized = TRUE;
/*
* This is the top-level real tvbuff for this data source,
* so its data source tvbuff is itself.
*/
tvb->ds_tvb = tvb;
real_tvb = (struct tvb_real *) tvb;
real_tvb->free_cb = NULL;
return tvb;
}
void
tvb_set_free_cb(tvbuff_t *tvb, const tvbuff_free_cb_t func)
{
struct tvb_real *real_tvb = (struct tvb_real *) tvb;
DISSECTOR_ASSERT(tvb);
DISSECTOR_ASSERT(tvb->ops == &tvb_real_ops);
real_tvb->free_cb = func;
}
void
tvb_set_child_real_data_tvbuff(tvbuff_t *parent, tvbuff_t *child)
{
DISSECTOR_ASSERT(parent && child);
DISSECTOR_ASSERT(parent->initialized);
DISSECTOR_ASSERT(child->initialized);
DISSECTOR_ASSERT(child->ops == &tvb_real_ops);
tvb_add_to_chain(parent, child);
}
tvbuff_t *
tvb_new_child_real_data(tvbuff_t *parent, const guint8* data, const guint length, const gint reported_length)
{
tvbuff_t *tvb = tvb_new_real_data(data, length, reported_length);
tvb_set_child_real_data_tvbuff(parent, tvb);
return tvb;
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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