rdp5.c

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/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Protocol services - RDP5 short form PDU processing
   Copyright (C) Matthew Chapman 1999-2005
   Copyright (C) Erik Forsberg 2003

   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 <precomp.h>

extern uint8 *g_next_packet;

extern RDPCOMP g_mppc_dict;

void
rdp5_process(STREAM s)
{
    uint16 length, count, x, y;
    uint8 type, ctype;
    uint8 *next;

    uint32 roff, rlen;
    struct stream *ns = &(g_mppc_dict.ns);
    struct stream *ts;

#if 0
    printf("RDP5 data:\n");
    hexdump(s->p, s->end - s->p);
#endif

    ui_begin_update();
    while (s->p < s->end)
    {
        in_uint8(s, type);
        if (type & RDP5_COMPRESSED)
        {
            in_uint8(s, ctype);
            in_uint16_le(s, length);
            type ^= RDP5_COMPRESSED;
        }
        else
        {
            ctype = 0;
            in_uint16_le(s, length);
        }
        g_next_packet = next = s->p + length;

        if (ctype & RDP_MPPC_COMPRESSED)
        {
            if (mppc_expand(s->p, length, ctype, &roff, &rlen) == -1)
                error("error while decompressing packet\n");

            /* 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;

            ts = ns;
        }
        else
            ts = s;

        switch (type)
        {
            case 0: /* update orders */
                in_uint16_le(ts, count);
                process_orders(ts, count);
                break;
            case 1: /* update bitmap */
                in_uint8s(ts, 2);   /* part length */
                process_bitmap_updates(ts);
                break;
            case 2: /* update palette */
                in_uint8s(ts, 2);   /* uint16 = 2 */
                process_palette(ts);
                break;
            case 3: /* update synchronize */
                break;
            case 5: /* null pointer */
                ui_set_null_cursor();
                break;
            case 6: /* default pointer */
                break;
            case 8: /* pointer position */
                in_uint16_le(ts, x);
                in_uint16_le(ts, y);
                if (s_check(ts))
                    ui_move_pointer(x, y);
                break;
            case 9: /* color pointer */
                process_colour_pointer_pdu(ts);
                break;
            case 10:    /* cached pointer */
                process_cached_pointer_pdu(ts);
                break;
            default:
                unimpl("RDP5 opcode %d\n", type);
        }

        s->p = next;
    }
    ui_end_update();
}