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/* tvbuff-int.h
*
* Structures that most TVB users should not be accessing directly.
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef __TVBUFF_INT_H__
#define __TVBUFF_INT_H__
struct tvbuff;
struct tvb_ops {
gsize (*tvb_size)(void);
void (*tvb_free)(struct tvbuff *tvb);
guint (*tvb_offset)(const struct tvbuff *tvb, guint counter);
const guint8 *(*tvb_get_ptr)(struct tvbuff *tvb, guint abs_offset, guint abs_length);
void *(*tvb_memcpy)(struct tvbuff *tvb, void *target, guint offset, guint length);
gint (*tvb_find_guint8)(tvbuff_t *tvb, guint abs_offset, guint limit, guint8 needle);
gint (*tvb_pbrk_guint8)(tvbuff_t *tvb, guint abs_offset, guint limit, const guint8 *needles, guchar *found_needle);
tvbuff_t *(*tvb_clone)(tvbuff_t *tvb, guint abs_offset, guint abs_length);
};
typedef struct {
/** The backing tvbuff_t */
struct tvbuff *tvb;
/** The offset of 'tvb' to which I'm privy */
guint offset;
/** The length of 'tvb' to which I'm privy */
guint length;
} tvb_backing_t;
typedef struct {
GSList *tvbs;
/* Used for quick testing to see if this
* is the tvbuff that a COMPOSITE is
* interested in. */
guint *start_offsets;
guint *end_offsets;
} tvb_comp_t;
/*
* Tvbuff flags.
*/
#define TVBUFF_FRAGMENT 0x00000001 /* this is a fragment */
struct tvbuff {
/* Doubly linked list pointers */
tvbuff_t *next;
tvbuff_t *previous;
/* Record-keeping */
const struct tvb_ops *ops;
gboolean initialized;
guint flags;
struct tvbuff *ds_tvb; /**< data source top-level tvbuff */
/** We're either a TVBUFF_REAL_DATA or a
* TVBUFF_SUBSET that has a backing buffer that
* has real_data != NULL, or a TVBUFF_COMPOSITE
* which has flattened its data due to a call
* to tvb_get_ptr().
*/
const guint8 *real_data;
/** Length of virtual buffer (and/or real_data). */
guint length;
/** Reported length. */
guint reported_length;
/* Offset from beginning of first TVBUFF_REAL. */
gint raw_offset;
};
struct tvb_real {
struct tvbuff tvb;
/** Func to call when actually freed */
tvbuff_free_cb_t free_cb;
};
struct tvb_subset {
struct tvbuff tvb;
tvb_backing_t subset;
};
struct tvb_composite {
struct tvbuff tvb;
tvb_comp_t composite;
};
WS_DLL_PUBLIC tvbuff_t *tvb_new(const struct tvb_ops *ops);
#endif
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