orders.c

运行在sdl上的rdesktop（远程桌面)

/*
   rdesktop: A Remote Desktop Protocol client.
   RDP order processing
   Copyright (C) Matthew Chapman 1999-2001

   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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "rdesktop.h"
#include "orders.h"

extern uint8 *next_packet;
static RDP_ORDER_STATE order_state;

/* Read field indicating which parameters are present */
static void
rdp_in_present(STREAM s, uint32 *present, uint8 flags, int size)
{
	uint8 bits;
	int i;

	if (flags & RDP_ORDER_SMALL)
	{
		size--;
	}

	if (flags & RDP_ORDER_TINY)
	{
		if (size < 2)
			size = 0;
		else
			size -= 2;
	}

	*present = 0;
	for (i = 0; i < size; i++)
	{
		in_uint8(s, bits);
		*present |= bits << (i * 8);
	}
}

/* Read a co-ordinate (16-bit, or 8-bit delta) */
static void
rdp_in_coord(STREAM s, uint16 *coord, BOOL delta)
{
	uint8 change;

	if (delta)
	{
		in_uint8(s, change);
		*coord += (signed char) change;
	}
	else
	{
		in_uint16_le(s, *coord);
	}
}

/* Read a colour entry */
static void
rdp_in_colour(STREAM s, uint8 *colour)
{
	in_uint8(s, *colour);
	s->p += 2;
}

/* Parse bounds information */
static BOOL
rdp_parse_bounds(STREAM s, BOUNDS *bounds)
{
	uint8 present;

	in_uint8(s, present);

	if (present & 1)
		rdp_in_coord(s, &bounds->left, False);
	else if (present & 16)
		rdp_in_coord(s, &bounds->left, True);

	if (present & 2)
		rdp_in_coord(s, &bounds->top, False);
	else if (present & 32)
		rdp_in_coord(s, &bounds->top, True);

	if (present & 4)
		rdp_in_coord(s, &bounds->right, False);
	else if (present & 64)
		rdp_in_coord(s, &bounds->right, True);

	if (present & 8)
		rdp_in_coord(s, &bounds->bottom, False);
	else if (present & 128)
		rdp_in_coord(s, &bounds->bottom, True);

	return s_check(s);
}

/* Parse a pen */
static BOOL
rdp_parse_pen(STREAM s, PEN *pen, uint32 present)
{
	if (present & 1)
		in_uint8(s, pen->style);

	if (present & 2)
		in_uint8(s, pen->width);

	if (present & 4)
		rdp_in_colour(s, &pen->colour);

	return s_check(s);
}

/* Parse a brush */
static BOOL
rdp_parse_brush(STREAM s, BRUSH *brush, uint32 present)
{
	if (present & 1)
		in_uint8(s, brush->xorigin);

	if (present & 2)
		in_uint8(s, brush->yorigin);

	if (present & 4)
		in_uint8(s, brush->style);

	if (present & 8)
		in_uint8(s, brush->pattern[0]);

	if (present & 16)
		in_uint8a(s, &brush->pattern[1], 7);

	return s_check(s);
}

/* Process a destination blt order */
static void
process_destblt(STREAM s, DESTBLT_ORDER *os, uint32 present, BOOL delta)
{
	if (present & 0x01)
		rdp_in_coord(s, &os->x, delta);

	if (present & 0x02)
		rdp_in_coord(s, &os->y, delta);

	if (present & 0x04)
		rdp_in_coord(s, &os->cx, delta);

	if (present & 0x08)
		rdp_in_coord(s, &os->cy, delta);

	if (present & 0x10)
		in_uint8(s, os->opcode);

	DEBUG(("DESTBLT(op=0x%x,x=%d,y=%d,cx=%d,cy=%d)\n",
	       os->opcode, os->x, os->y, os->cx, os->cy));

	ui_destblt(ROP2_S(os->opcode), os->x, os->y, os->cx, os->cy);
}

/* Process a pattern blt order */
static void
process_patblt(STREAM s, PATBLT_ORDER *os, uint32 present, BOOL delta)
{
	if (present & 0x0001)
		rdp_in_coord(s, &os->x, delta);

	if (present & 0x0002)
		rdp_in_coord(s, &os->y, delta);

	if (present & 0x0004)
		rdp_in_coord(s, &os->cx, delta);

	if (present & 0x0008)
		rdp_in_coord(s, &os->cy, delta);

	if (present & 0x0010)
		in_uint8(s, os->opcode);

	if (present & 0x0020)
		rdp_in_colour(s, &os->bgcolour);

	if (present & 0x0040)
		rdp_in_colour(s, &os->fgcolour);

	rdp_parse_brush(s, &os->brush, present >> 7);

	DEBUG(("PATBLT(op=0x%x,x=%d,y=%d,cx=%d,cy=%d,bs=%d,bg=0x%x,fg=0x%x)\n",
	       os->opcode, os->x, os->y, os->cx, os->cy,
	       os->brush.style, os->bgcolour, os->fgcolour));

	ui_patblt(ROP2_P(os->opcode), os->x, os->y, os->cx, os->cy,
		  &os->brush, os->bgcolour, os->fgcolour);
}

/* Process a screen blt order */
static void
process_screenblt(STREAM s, SCREENBLT_ORDER *os, uint32 present, BOOL delta)
{
	if (present & 0x0001)
		rdp_in_coord(s, &os->x, delta);

	if (present & 0x0002)
		rdp_in_coord(s, &os->y, delta);

	if (present & 0x0004)
		rdp_in_coord(s, &os->cx, delta);

	if (present & 0x0008)
		rdp_in_coord(s, &os->cy, delta);

	if (present & 0x0010)
		in_uint8(s, os->opcode);

	if (present & 0x0020)
		rdp_in_coord(s, &os->srcx, delta);

	if (present & 0x0040)
		rdp_in_coord(s, &os->srcy, delta);

	DEBUG(("SCREENBLT(op=0x%x,x=%d,y=%d,cx=%d,cy=%d,srcx=%d,srcy=%d)\n",
	       os->opcode, os->x, os->y, os->cx, os->cy, os->srcx, os->srcy));

	ui_screenblt(ROP2_S(os->opcode), os->x, os->y, os->cx, os->cy,
		     os->srcx, os->srcy);
}

/* Process a line order */
static void
process_line(STREAM s, LINE_ORDER *os, uint32 present, BOOL delta)
{
	if (present & 0x0001)
		in_uint16_le(s, os->mixmode);

	if (present & 0x0002)
		rdp_in_coord(s, &os->startx, delta);

	if (present & 0x0004)
		rdp_in_coord(s, &os->starty, delta);

	if (present & 0x0008)
		rdp_in_coord(s, &os->endx, delta);

	if (present & 0x0010)
		rdp_in_coord(s, &os->endy, delta);

	if (present & 0x0020)
		rdp_in_colour(s, &os->bgcolour);

	if (present & 0x0040)
		in_uint8(s, os->opcode);

	rdp_parse_pen(s, &os->pen, present >> 7);

	DEBUG(("LINE(op=0x%x,sx=%d,sy=%d,dx=%d,dx=%d,fg=0x%x)\n",
	       os->opcode, os->startx, os->starty, os->endx, os->endy,
	       os->pen.colour));

	if (os->opcode < 0x01 || os->opcode > 0x10)
	{
		error("bad ROP2 0x%x\n", os->opcode);
		return;
	}

	ui_line(os->opcode - 1, os->startx, os->starty,
		os->endx, os->endy, &os->pen);
}

/* Process an opaque rectangle order */
static void
process_rect(STREAM s, RECT_ORDER *os, uint32 present, BOOL delta)
{
	if (present & 0x01)
		rdp_in_coord(s, &os->x, delta);

	if (present & 0x02)
		rdp_in_coord(s, &os->y, delta);

	if (present & 0x04)
		rdp_in_coord(s, &os->cx, delta);

	if (present & 0x08)
		rdp_in_coord(s, &os->cy, delta);

	if (present & 0x10)
		in_uint8(s, os->colour);

	DEBUG(("RECT(x=%d,y=%d,cx=%d,cy=%d,fg=0x%x)\n",
	       os->x, os->y, os->cx, os->cy, os->colour));

	ui_rect(os->x, os->y, os->cx, os->cy, os->colour);
}

/* Process a desktop save order */
static void
process_desksave(STREAM s, DESKSAVE_ORDER *os, uint32 present, BOOL delta)
{
	int width, height;

	if (present & 0x01)
		in_uint32_le(s, os->offset);

	if (present & 0x02)
		rdp_in_coord(s, &os->left, delta);

	if (present & 0x04)
		rdp_in_coord(s, &os->top, delta);

	if (present & 0x08)
		rdp_in_coord(s, &os->right, delta);

	if (present & 0x10)
		rdp_in_coord(s, &os->bottom, delta);

	if (present & 0x20)
		in_uint8(s, os->action);

	DEBUG(("DESKSAVE(l=%d,t=%d,r=%d,b=%d,off=%d,op=%d)\n",
	       os->left, os->top, os->right, os->bottom, os->offset,
	       os->action));

	width = os->right - os->left + 1;
	height = os->bottom - os->top + 1;

	if (os->action == 0)
		ui_desktop_save(os->offset, os->left, os->top, width, height);
	else
		ui_desktop_restore(os->offset, os->left, os->top, width,
				   height);
}

/* Process a memory blt order */
static void
process_memblt(STREAM s, MEMBLT_ORDER *os, uint32 present, BOOL delta)
{
	HBITMAP bitmap;

	if (present & 0x0001)
	{
		in_uint8(s, os->cache_id);
		in_uint8(s, os->colour_table);
	}

	if (present & 0x0002)
		rdp_in_coord(s, &os->x, delta);

	if (present & 0x0004)
		rdp_in_coord(s, &os->y, delta);

	if (present & 0x0008)
		rdp_in_coord(s, &os->cx, delta);

	if (present & 0x0010)
		rdp_in_coord(s, &os->cy, delta);

	if (present & 0x0020)
		in_uint8(s, os->opcode);

	if (present & 0x0040)
		rdp_in_coord(s, &os->srcx, delta);

	if (present & 0x0080)
		rdp_in_coord(s, &os->srcy, delta);

	if (present & 0x0100)
		in_uint16_le(s, os->cache_idx);

	DEBUG(("MEMBLT(op=0x%x,x=%d,y=%d,cx=%d,cy=%d,id=%d,idx=%d)\n",
	       os->opcode, os->x, os->y, os->cx, os->cy, os->cache_id,
	       os->cache_idx));

	bitmap = cache_get_bitmap(os->cache_id, os->cache_idx);
	if (bitmap == NULL)
		return;

	ui_memblt(ROP2_S(os->opcode), os->x, os->y, os->cx, os->cy,
		  bitmap, os->srcx, os->srcy);
}

/* Process a 3-way blt order */
static void
process_triblt(STREAM s, TRIBLT_ORDER *os, uint32 present, BOOL delta)
{
	HBITMAP bitmap;

	if (present & 0x000001)
	{
		in_uint8(s, os->cache_id);
		in_uint8(s, os->colour_table);
	}

	if (present & 0x000002)
		rdp_in_coord(s, &os->x, delta);

	if (present & 0x000004)
		rdp_in_coord(s, &os->y, delta);

	if (present & 0x000008)
		rdp_in_coord(s, &os->cx, delta);

	if (present & 0x000010)
		rdp_in_coord(s, &os->cy, delta);

	if (present & 0x000020)
		in_uint8(s, os->opcode);

	if (present & 0x000040)
		rdp_in_coord(s, &os->srcx, delta);

	if (present & 0x000080)
		rdp_in_coord(s, &os->srcy, delta);

	if (present & 0x000100)
		rdp_in_colour(s, &os->bgcolour);

	if (present & 0x000200)
		rdp_in_colour(s, &os->fgcolour);

	rdp_parse_brush(s, &os->brush, present >> 10);

	if (present & 0x008000)
		in_uint16_le(s, os->cache_idx);

	if (present & 0x010000)
		in_uint16_le(s, os->unknown);

	DEBUG(("TRIBLT(op=0x%x,x=%d,y=%d,cx=%d,cy=%d,id=%d,idx=%d,bs=%d,bg=0x%x,fg=0x%x)\n",
	       os->opcode, os->x, os->y, os->cx, os->cy, os->cache_id,
	       os->cache_idx, os->brush.style, os->bgcolour, os->fgcolour));

	bitmap = cache_get_bitmap(os->cache_id, os->cache_idx);
	if (bitmap == NULL)
		return;

	ui_triblt(os->opcode, os->x, os->y, os->cx, os->cy,
		  bitmap, os->srcx, os->srcy,
		  &os->brush, os->bgcolour, os->fgcolour);
}

/* Parse a delta co-ordinate in polyline order form */
static int
parse_delta(uint8 *buffer, int *offset)
{
	int value = buffer[(*offset)++];
	int two_byte = value & 0x80;

	if (value & 0x40)	/* sign bit */
		value |= ~0x3f;
	else
		value &= 0x3f;

	if (two_byte)
		value = (value << 8) | buffer[(*offset)++];

	return value;
}

/* Process a polyline order */
static void
process_polyline(STREAM s, POLYLINE_ORDER *os, uint32 present, BOOL delta)
{
	int index, line, data;
	int x, y, xfrom, yfrom;
	uint8 flags = 0;
	PEN pen;

	if (present & 0x01)