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/*
* Copyright (C) 2017 Wiki Wang <wikiwang@live.com>. All Rights Reserved.
*
* This 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 software 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 software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
/*
* trle.c - handle trle encoding.
*
* This file shouldn't be compiled directly. It is included multiple times by
* rfbproto.c, each time with a different definition of the macro BPP. For
* each value of BPP, this file defines a function which handles a trle
* encoded rectangle with BPP bits per pixel.
*/
#ifndef REALBPP
#define REALBPP BPP
#endif
#if !defined(UNCOMP) || UNCOMP == 0
#define HandleTRLE CONCAT2E(HandleTRLE, REALBPP)
#elif UNCOMP > 0
#define HandleTRLE CONCAT3E(HandleTRLE, REALBPP, Down)
#else
#define HandleTRLE CONCAT3E(HandleTRLE, REALBPP, Up)
#endif
#define CARDBPP CONCAT3E(uint, BPP, _t)
#define CARDREALBPP CONCAT3E(uint, REALBPP, _t)
#if REALBPP != BPP && defined(UNCOMP) && UNCOMP != 0
#if UNCOMP > 0
#define UncompressCPixel(pointer) ((*(CARDBPP *)pointer) >> UNCOMP)
#else
#define UncompressCPixel(pointer) ((*(CARDBPP *)pointer) << (-(UNCOMP)))
#endif
#else
#define UncompressCPixel(pointer) (*(CARDBPP *)pointer)
#endif
static rfbBool HandleTRLE(rfbClient *client, int rx, int ry, int rw, int rh) {
int x, y, w, h;
uint8_t type, last_type = 0;
int min_buffer_size = 16 * 16 * (REALBPP / 8) * 2;
uint8_t *buffer;
CARDBPP palette[128];
int bpp = 0, mask = 0, divider = 0;
CARDBPP color = 0;
/* First make sure we have a large enough raw buffer to hold the
* decompressed data. In practice, with a fixed REALBPP, fixed frame
* buffer size and the first update containing the entire frame
* buffer, this buffer allocation should only happen once, on the
* first update.
*/
if (client->raw_buffer_size < min_buffer_size) {
if (client->raw_buffer != NULL) {
free(client->raw_buffer);
}
client->raw_buffer_size = min_buffer_size;
client->raw_buffer = (char *)malloc(client->raw_buffer_size);
}
rfbClientLog("Update %d %d %d %d\n", rx, ry, rw, rh);
for (y = ry; y < ry + rh; y += 16) {
for (x = rx; x < rx + rw; x += 16) {
w = h = 16;
if (rx + rw - x < 16)
w = rx + rw - x;
if (ry + rh - y < 16)
h = ry + rh - y;
if (!ReadFromRFBServer(client, (char *)(&type), 1))
return FALSE;
buffer = (uint8_t*)(client->raw_buffer);
switch (type) {
case 0: {
if (!ReadFromRFBServer(client, (char *)buffer, w * h * REALBPP / 8))
return FALSE;
#if REALBPP != BPP
int i, j;
for (j = y * client->width; j < (y + h) * client->width;
j += client->width)
for (i = x; i < x + w; i++, buffer += REALBPP / 8)
((CARDBPP *)client->frameBuffer)[j + i] = UncompressCPixel(buffer);
#else
client->GotBitmap(client, buffer, x, y, w, h);
#endif
type = last_type;
break;
}
case 1: {
if (!ReadFromRFBServer(client, (char *)buffer, REALBPP / 8))
return FALSE;
color = UncompressCPixel(buffer);
client->GotFillRect(client, x, y, w, h, color);
last_type = type;
break;
}
case_127:
case 127:
switch (last_type) {
case 0:
return FALSE;
case 1:
client->GotFillRect(client, x, y, w, h, color);
type = last_type;
break;
case 128:
return FALSE;
default:
if (last_type >= 130) {
last_type = last_type & 0x7f;
bpp = (last_type > 4 ? (last_type > 16 ? 8 : 4)
: (last_type > 2 ? 2 : 1)),
mask = (1 << bpp) - 1, divider = (8 / bpp);
}
if (last_type <= 16) {
int i, j, shift;
if (!ReadFromRFBServer(client, (char*)buffer,
(w + divider - 1) / divider * h))
return FALSE;
/* read palettized pixels */
for (j = y * client->width; j < (y + h) * client->width;
j += client->width) {
for (i = x, shift = 8 - bpp; i < x + w; i++) {
((CARDBPP *)client->frameBuffer)[j + i] =
palette[((*buffer) >> shift) & mask];
shift -= bpp;
if (shift < 0) {
shift = 8 - bpp;
buffer++;
}
}
if (shift < 8 - bpp)
buffer++;
type = last_type;
}
} else
return FALSE;
}
break;
case 128: {
int i = 0, j = 0;
while (j < h) {
int color, length, buffer_pos = 0;
/* read color */
if (!ReadFromRFBServer(client, (char*)buffer, REALBPP / 8 + 1))
return FALSE;
color = UncompressCPixel(buffer);
buffer += REALBPP / 8;
buffer_pos += REALBPP / 8;
/* read run length */
length = 1;
while (*buffer == 0xff && buffer_pos < client->raw_buffer_size-1) {
if (!ReadFromRFBServer(client, (char*)buffer + 1, 1))
return FALSE;
length += *buffer;
buffer++;
buffer_pos++;
}
length += *buffer;
buffer++;
while (j < h && length > 0) {
((CARDBPP *)client->frameBuffer)[(y + j) * client->width + x + i] =
color;
length--;
i++;
if (i >= w) {
i = 0;
j++;
}
}
if (length > 0)
rfbClientLog("Warning: possible TRLE corruption\n");
}
type = last_type;
break;
}
case_129:
case 129: {
int i, j;
/* read palettized pixels */
i = j = 0;
while (j < h) {
int color, length, buffer_pos = 0;
/* read color */
if (!ReadFromRFBServer(client, (char *)buffer, 1))
return FALSE;
color = palette[(*buffer) & 0x7f];
length = 1;
if (*buffer & 0x80) {
if (!ReadFromRFBServer(client, (char *)buffer + 1, 1))
return FALSE;
buffer++;
buffer_pos++;
/* read run length */
while (*buffer == 0xff && buffer_pos < client->raw_buffer_size-1) {
if (!ReadFromRFBServer(client, (char *)buffer + 1, 1))
return FALSE;
length += *buffer;
buffer++;
buffer_pos++;
}
length += *buffer;
}
buffer++;
while (j < h && length > 0) {
((CARDBPP *)client->frameBuffer)[(y + j) * client->width + x + i] =
color;
length--;
i++;
if (i >= w) {
i = 0;
j++;
}
}
if (length > 0)
rfbClientLog("Warning: possible TRLE corruption\n");
}
if (type == 129) {
type = last_type;
}
break;
}
default:
if (type <= 16) {
int i;
bpp = (type > 4 ? 4 : (type > 2 ? 2 : 1)),
mask = (1 << bpp) - 1, divider = (8 / bpp);
if (!ReadFromRFBServer(client, (char *)buffer, type * REALBPP / 8))
return FALSE;
/* read palette */
for (i = 0; i < type; i++, buffer += REALBPP / 8)
palette[i] = UncompressCPixel(buffer);
last_type = type;
goto case_127;
} else if (type >= 130) {
int i;
if (!ReadFromRFBServer(client, (char *)buffer, (type - 128) * REALBPP / 8))
return FALSE;
/* read palette */
for (i = 0; i < type - 128; i++, buffer += REALBPP / 8)
palette[i] = UncompressCPixel(buffer);
last_type = type;
goto case_129;
} else
return FALSE;
}
last_type = type;
}
}
return TRUE;
}
#undef CARDBPP
#undef CARDREALBPP
#undef HandleTRLE
#undef UncompressCPixel
#undef REALBPP
#undef UNCOMP
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