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/* -*- c-basic-offset: 8 -*-
rdesktop: A Remote Desktop Protocol client.
Protocol services - RDP Fast-Path PDU processing
Copyright (C) Matthew Chapman <matthewc.unsw.edu.au> 1999-2008
Copyright 2003-2008 Erik Forsberg <forsberg@cendio.se> for Cendio AB
Copyright 2017 Karl Mikaelsson <derfian@cendio.se> for Cendio AB
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "rdesktop.h"
extern uint8 *g_next_packet;
extern RDPCOMP g_mppc_dict;
static void
process_ts_fp_update_by_code(STREAM s, uint8 code)
{
uint16 count, x, y;
switch (code)
{
case FASTPATH_UPDATETYPE_ORDERS:
in_uint16_le(s, count);
process_orders(s, count);
break;
case FASTPATH_UPDATETYPE_BITMAP:
in_uint8s(s, 2); /* part length */
process_bitmap_updates(s);
break;
case FASTPATH_UPDATETYPE_PALETTE:
in_uint8s(s, 2); /* uint16 = 2 */
process_palette(s);
break;
case FASTPATH_UPDATETYPE_SYNCHRONIZE:
break;
case FASTPATH_UPDATETYPE_PTR_NULL:
ui_set_null_cursor();
break;
case FASTPATH_UPDATETYPE_PTR_DEFAULT:
set_system_pointer(SYSPTR_DEFAULT);
break;
case FASTPATH_UPDATETYPE_PTR_POSITION:
in_uint16_le(s, x);
in_uint16_le(s, y);
if (s_check(s))
ui_move_pointer(x, y);
break;
case FASTPATH_UPDATETYPE_COLOR:
process_colour_pointer_pdu(s);
break;
case FASTPATH_UPDATETYPE_CACHED:
process_cached_pointer_pdu(s);
break;
case FASTPATH_UPDATETYPE_POINTER:
process_new_pointer_pdu(s);
break;
default:
logger(Protocol, Warning, "process_ts_fp_updates_by_code(), unhandled opcode %d",
code);
}
}
void
process_ts_fp_updates(STREAM s)
{
uint16 length;
uint8 hdr, code, frag, comp, ctype = 0;
uint8 *next;
uint32 roff, rlen;
struct stream *ns = &(g_mppc_dict.ns);
struct stream *ts;
static STREAM assembled[0x0F] = { 0 };
ui_begin_update();
while (s->p < s->end)
{
/* Reading a number of TS_FP_UPDATE structures from the stream here.. */
in_uint8(s, hdr); /* updateHeader */
code = hdr & 0x0F; /* |- updateCode */
frag = hdr & 0x30; /* |- fragmentation */
comp = hdr & 0xC0; /* `- compression */
if (comp & FASTPATH_OUTPUT_COMPRESSION_USED)
in_uint8(s, ctype); /* compressionFlags */
in_uint16_le(s, length); /* length */
g_next_packet = next = s->p + length;
if (ctype & RDP_MPPC_COMPRESSED)
{
if (mppc_expand(s->p, length, ctype, &roff, &rlen) == -1)
logger(Protocol, Error,
"process_ts_fp_update_pdu(), error while decompressing packet");
/* allocate memory and copy the uncompressed data into the temporary stream */
ns->data = (uint8 *) xrealloc(ns->data, rlen);
memcpy((ns->data), (unsigned char *) (g_mppc_dict.hist + roff), rlen);
ns->size = rlen;
ns->end = (ns->data + ns->size);
ns->p = ns->data;
ns->rdp_hdr = ns->p;
length = rlen;
ts = ns;
}
else
ts = s;
if (frag == FASTPATH_FRAGMENT_SINGLE)
{
process_ts_fp_update_by_code(ts, code);
}
else /* Fragmented packet, we must reassemble */
{
if (assembled[code] == NULL)
{
assembled[code] = xmalloc(sizeof(struct stream));
memset(assembled[code], 0, sizeof(struct stream));
s_realloc(assembled[code], RDESKTOP_FASTPATH_MULTIFRAGMENT_MAX_SIZE);
s_reset(assembled[code]);
}
if (frag == FASTPATH_FRAGMENT_FIRST)
{
s_reset(assembled[code]);
}
out_uint8p(assembled[code], ts->p, length);
if (frag == FASTPATH_FRAGMENT_LAST)
{
s_mark_end(assembled[code]);
assembled[code]->p = assembled[code]->data;
process_ts_fp_update_by_code(assembled[code], code);
}
}
s->p = next;
}
ui_end_update();
}
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