forked from osmocom/wireshark
115 lines
3.0 KiB
C
115 lines
3.0 KiB
C
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/* frame_tvbuff.c
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* Implements a tvbuff for frame
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/tvbuff-int.h>
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#include <epan/tvbuff.h>
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#include "frame_tvbuff.h"
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/* XXX, to read data with wtap_seek_read() we need:
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* cf->wth, fdata->file_off, fdata->cap_len
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* add when ready to structure below
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*/
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struct tvb_frame {
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struct tvbuff tvb;
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};
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static gsize
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frame_sizeof(void)
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{
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return sizeof(struct tvb_frame);
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}
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static guint
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frame_offset(const tvbuff_t *tvb _U_, const guint counter)
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{
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return counter;
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}
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static const struct tvb_ops tvb_frame_ops = {
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frame_sizeof, /* size */
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NULL, /* free */
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frame_offset, /* offset */
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NULL, /* get_ptr */
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NULL, /* memcpy */
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NULL, /* find_guint8 */
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NULL, /* pbrk_guint8 */
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};
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/* based on tvb_new_real_data() */
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tvbuff_t *
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frame_tvbuff_new(const frame_data *fd, const guint8 *buf)
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{
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tvbuff_t *tvb;
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tvb = tvb_new(&tvb_frame_ops);
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/*
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* XXX - currently, the length arguments in
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* tvbuff structure are signed, but the captured
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* and reported length values are unsigned; this means
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* that length values > 2^31 - 1 will appear as
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* negative lengths
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*
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* Captured length values that large will already
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* have been filtered out by the Wiretap modules
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* (the file will be reported as corrupted), to
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* avoid trying to allocate large chunks of data.
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*
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* Reported length values will not have been
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* filtered out, and should not be filtered out,
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* as those lengths are not necessarily invalid.
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*
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* For now, we clip the reported length at G_MAXINT
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*
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* (XXX, is this still a problem?) There was an exception when we call
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* tvb_new_real_data() now there's no one
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*/
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tvb->real_data = buf;
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tvb->length = fd->cap_len;
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tvb->reported_length = fd->pkt_len > G_MAXINT ? G_MAXINT : fd->pkt_len;
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tvb->initialized = TRUE;
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/*
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* This is the top-level real tvbuff for this data source,
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* so its data source tvbuff is itself.
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*/
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tvb->ds_tvb = tvb;
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return tvb;
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}
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tvbuff_t *
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frame_tvbuff_new_buffer(const frame_data *fd, Buffer *buf)
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{
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return frame_tvbuff_new(fd, buffer_start_ptr(buf));
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}
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