forked from osmocom/wireshark
a0c53ffaa1
- ep_tvb_get_bits() -> wmem_packet_tvb_get_bits() - tvb_g_memdup()/ep_tvb_memdup() -> tvb_memdup() - tvb_fake_unicode()/tvb_get_ephemeral_faked_unicode() -> tvb_get_faked_unicode() - tvb_get_g_string()/tvb_get_ephemeral_string()/tvb_get_seasonal_string() -> tvb_get_string() - tvb_get_g_unicode_string()/tvb_get_ephemeral_unicode_string() -> tvb_get_unicode_string() - tvb_get_ephemeral_string_enc() -> tvb_get_string_enc() - update docs accordingly svn path=/trunk/; revision=52172
300 lines
8.3 KiB
C
300 lines
8.3 KiB
C
/* tvbuff_composite.c
|
|
*
|
|
* $Id$
|
|
*
|
|
* Copyright (c) 2000 by Gilbert Ramirez <gram@alumni.rice.edu>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <epan/emem.h>
|
|
|
|
#include "tvbuff.h"
|
|
#include "tvbuff-int.h"
|
|
#include "proto.h" /* XXX - only used for DISSECTOR_ASSERT, probably a new header file? */
|
|
|
|
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;
|
|
|
|
struct tvb_composite {
|
|
struct tvbuff tvb;
|
|
|
|
tvb_comp_t composite;
|
|
};
|
|
|
|
static void
|
|
composite_free(tvbuff_t *tvb)
|
|
{
|
|
struct tvb_composite *composite_tvb = (struct tvb_composite *) tvb;
|
|
tvb_comp_t *composite = &composite_tvb->composite;
|
|
|
|
g_slist_free(composite->tvbs);
|
|
|
|
g_free(composite->start_offsets);
|
|
g_free(composite->end_offsets);
|
|
if (tvb->real_data) {
|
|
/*
|
|
* XXX - do this with a union?
|
|
*/
|
|
g_free((gpointer)tvb->real_data);
|
|
}
|
|
}
|
|
|
|
static guint
|
|
composite_offset(const tvbuff_t *tvb, const guint counter)
|
|
{
|
|
const struct tvb_composite *composite_tvb = (const struct tvb_composite *) tvb;
|
|
const tvbuff_t *member = (const tvbuff_t *)composite_tvb->composite.tvbs->data;
|
|
|
|
return tvb_offset_from_real_beginning_counter(member, counter);
|
|
}
|
|
|
|
static const guint8*
|
|
composite_get_ptr(tvbuff_t *tvb, guint abs_offset, guint abs_length)
|
|
{
|
|
struct tvb_composite *composite_tvb = (struct tvb_composite *) tvb;
|
|
guint i, num_members;
|
|
tvb_comp_t *composite;
|
|
tvbuff_t *member_tvb = NULL;
|
|
guint member_offset;
|
|
GSList *slist;
|
|
|
|
/* DISSECTOR_ASSERT(tvb->ops == &tvb_composite_ops); */
|
|
|
|
/* Maybe the range specified by offset/length
|
|
* is contiguous inside one of the member tvbuffs */
|
|
composite = &composite_tvb->composite;
|
|
num_members = g_slist_length(composite->tvbs);
|
|
|
|
for (i = 0; i < num_members; i++) {
|
|
if (abs_offset <= composite->end_offsets[i]) {
|
|
slist = g_slist_nth(composite->tvbs, i);
|
|
member_tvb = (tvbuff_t *)slist->data;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* special case */
|
|
if (!member_tvb) {
|
|
DISSECTOR_ASSERT(abs_offset == tvb->length && abs_length == 0);
|
|
return "";
|
|
}
|
|
|
|
member_offset = abs_offset - composite->start_offsets[i];
|
|
|
|
if (tvb_bytes_exist(member_tvb, member_offset, abs_length)) {
|
|
/*
|
|
* The range is, in fact, contiguous within member_tvb.
|
|
*/
|
|
DISSECTOR_ASSERT(!tvb->real_data);
|
|
return tvb_get_ptr(member_tvb, member_offset, abs_length);
|
|
}
|
|
else {
|
|
tvb->real_data = (guint8 *)tvb_memdup(NULL, tvb, 0, -1);
|
|
return tvb->real_data + abs_offset;
|
|
}
|
|
|
|
DISSECTOR_ASSERT_NOT_REACHED();
|
|
}
|
|
|
|
static void *
|
|
composite_memcpy(tvbuff_t *tvb, void* _target, guint abs_offset, guint abs_length)
|
|
{
|
|
struct tvb_composite *composite_tvb = (struct tvb_composite *) tvb;
|
|
guint8 *target = (guint8 *) _target;
|
|
|
|
guint i, num_members;
|
|
tvb_comp_t *composite;
|
|
tvbuff_t *member_tvb = NULL;
|
|
guint member_offset, member_length;
|
|
GSList *slist;
|
|
|
|
/* DISSECTOR_ASSERT(tvb->ops == &tvb_composite_ops); */
|
|
|
|
/* Maybe the range specified by offset/length
|
|
* is contiguous inside one of the member tvbuffs */
|
|
composite = &composite_tvb->composite;
|
|
num_members = g_slist_length(composite->tvbs);
|
|
|
|
for (i = 0; i < num_members; i++) {
|
|
if (abs_offset <= composite->end_offsets[i]) {
|
|
slist = g_slist_nth(composite->tvbs, i);
|
|
member_tvb = (tvbuff_t *)slist->data;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* special case */
|
|
if (!member_tvb) {
|
|
DISSECTOR_ASSERT(abs_offset == tvb->length && abs_length == 0);
|
|
return target;
|
|
}
|
|
|
|
member_offset = abs_offset - composite->start_offsets[i];
|
|
|
|
if (tvb_bytes_exist(member_tvb, member_offset, abs_length)) {
|
|
DISSECTOR_ASSERT(!tvb->real_data);
|
|
return tvb_memcpy(member_tvb, target, member_offset, abs_length);
|
|
}
|
|
else {
|
|
/* The requested data is non-contiguous inside
|
|
* the member tvb. We have to memcpy() the part that's in the member tvb,
|
|
* then iterate across the other member tvb's, copying their portions
|
|
* until we have copied all data.
|
|
*/
|
|
member_length = tvb_length_remaining(member_tvb, member_offset);
|
|
|
|
/* composite_memcpy() can't handle a member_length of zero. */
|
|
DISSECTOR_ASSERT(member_length > 0);
|
|
|
|
tvb_memcpy(member_tvb, target, member_offset, member_length);
|
|
abs_offset += member_length;
|
|
abs_length -= member_length;
|
|
|
|
/* Recurse */
|
|
if (abs_length > 0) {
|
|
composite_memcpy(tvb, target + member_length, abs_offset, abs_length);
|
|
}
|
|
|
|
return target;
|
|
}
|
|
|
|
DISSECTOR_ASSERT_NOT_REACHED();
|
|
}
|
|
|
|
static const struct tvb_ops tvb_composite_ops = {
|
|
sizeof(struct tvb_composite), /* size */
|
|
|
|
composite_free, /* free */
|
|
composite_offset, /* offset */
|
|
composite_get_ptr, /* get_ptr */
|
|
composite_memcpy, /* memcpy */
|
|
NULL, /* find_guint8 XXX */
|
|
NULL, /* pbrk_guint8 XXX */
|
|
NULL, /* clone */
|
|
};
|
|
|
|
/*
|
|
* Composite tvb
|
|
*
|
|
* 1. A composite tvb is automatically chained to its first member when the
|
|
* tvb is finalized.
|
|
* This means that composite tvb members must all be in the same chain.
|
|
* ToDo: enforce this: By searching the chain?
|
|
*/
|
|
tvbuff_t *
|
|
tvb_new_composite(void)
|
|
{
|
|
tvbuff_t *tvb = tvb_new(&tvb_composite_ops);
|
|
struct tvb_composite *composite_tvb = (struct tvb_composite *) tvb;
|
|
tvb_comp_t *composite = &composite_tvb->composite;
|
|
|
|
composite->tvbs = NULL;
|
|
composite->start_offsets = NULL;
|
|
composite->end_offsets = NULL;
|
|
|
|
return tvb;
|
|
}
|
|
|
|
void
|
|
tvb_composite_append(tvbuff_t *tvb, tvbuff_t *member)
|
|
{
|
|
struct tvb_composite *composite_tvb = (struct tvb_composite *) tvb;
|
|
tvb_comp_t *composite;
|
|
|
|
DISSECTOR_ASSERT(tvb && !tvb->initialized);
|
|
DISSECTOR_ASSERT(tvb->ops == &tvb_composite_ops);
|
|
|
|
/* Don't allow zero-length TVBs: composite_memcpy() can't handle them
|
|
* and anyway it makes no sense.
|
|
*/
|
|
DISSECTOR_ASSERT(member->length);
|
|
|
|
composite = &composite_tvb->composite;
|
|
composite->tvbs = g_slist_append(composite->tvbs, member);
|
|
}
|
|
|
|
void
|
|
tvb_composite_prepend(tvbuff_t *tvb, tvbuff_t *member)
|
|
{
|
|
struct tvb_composite *composite_tvb = (struct tvb_composite *) tvb;
|
|
tvb_comp_t *composite;
|
|
|
|
DISSECTOR_ASSERT(tvb && !tvb->initialized);
|
|
DISSECTOR_ASSERT(tvb->ops == &tvb_composite_ops);
|
|
|
|
/* Don't allow zero-length TVBs: composite_memcpy() can't handle them
|
|
* and anyway it makes no sense.
|
|
*/
|
|
DISSECTOR_ASSERT(member->length);
|
|
|
|
composite = &composite_tvb->composite;
|
|
composite->tvbs = g_slist_prepend(composite->tvbs, member);
|
|
}
|
|
|
|
void
|
|
tvb_composite_finalize(tvbuff_t *tvb)
|
|
{
|
|
struct tvb_composite *composite_tvb = (struct tvb_composite *) tvb;
|
|
GSList *slist;
|
|
guint num_members;
|
|
tvbuff_t *member_tvb;
|
|
tvb_comp_t *composite;
|
|
int i = 0;
|
|
|
|
DISSECTOR_ASSERT(tvb && !tvb->initialized);
|
|
DISSECTOR_ASSERT(tvb->ops == &tvb_composite_ops);
|
|
DISSECTOR_ASSERT(tvb->length == 0);
|
|
DISSECTOR_ASSERT(tvb->reported_length == 0);
|
|
|
|
composite = &composite_tvb->composite;
|
|
num_members = g_slist_length(composite->tvbs);
|
|
|
|
/* Dissectors should not create composite TVBs if they're not going to
|
|
* put at least one TVB in them.
|
|
* (Without this check--or something similar--we'll seg-fault below.)
|
|
*/
|
|
DISSECTOR_ASSERT(num_members);
|
|
|
|
composite->start_offsets = g_new(guint, num_members);
|
|
composite->end_offsets = g_new(guint, num_members);
|
|
|
|
for (slist = composite->tvbs; slist != NULL; slist = slist->next) {
|
|
DISSECTOR_ASSERT((guint) i < num_members);
|
|
member_tvb = (tvbuff_t *)slist->data;
|
|
composite->start_offsets[i] = tvb->length;
|
|
tvb->length += member_tvb->length;
|
|
tvb->reported_length += member_tvb->reported_length;
|
|
composite->end_offsets[i] = tvb->length - 1;
|
|
i++;
|
|
}
|
|
tvb_add_to_chain((tvbuff_t *)composite->tvbs->data, tvb); /* chain composite tvb to first member */
|
|
tvb->initialized = TRUE;
|
|
}
|