Shared TDE VNC library sources
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libtdevnc/libvncclient/ultra.c

214 lines
7.1 KiB

/*
* Copyright (C) 2000 Tridia Corporation. All Rights Reserved.
* Copyright (C) 1999 AT&T Laboratories Cambridge. 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.
*/
/*
* ultrazip.c - handle ultrazip 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 an zlib
* encoded rectangle with BPP bits per pixel.
*/
#define HandleUltraZipBPP CONCAT2E(HandleUltraZip,BPP)
#define HandleUltraBPP CONCAT2E(HandleUltra,BPP)
#define CARDBPP CONCAT3E(uint,BPP,_t)
static rfbBool
HandleUltraBPP (rfbClient* client, int rx, int ry, int rw, int rh)
{
rfbZlibHeader hdr;
int toRead=0;
int inflateResult=0;
lzo_uint uncompressedBytes = (( rw * rh ) * ( BPP / 8 ));
if (!ReadFromRFBServer(client, (char *)&hdr, sz_rfbZlibHeader))
return FALSE;
toRead = rfbClientSwap32IfLE(hdr.nBytes);
if (toRead==0) return TRUE;
if (uncompressedBytes==0)
{
rfbClientLog("ultra error: rectangle has 0 uncomressed bytes ((%dw * %dh) * (%d / 8))\n", rw, rh, BPP);
return FALSE;
}
/* First make sure we have a large enough raw buffer to hold the
* decompressed data. In practice, with a fixed BPP, 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 < (int)uncompressedBytes) {
if ( client->raw_buffer != NULL ) {
free( client->raw_buffer );
}
client->raw_buffer_size = uncompressedBytes;
/* buffer needs to be aligned on 4-byte boundaries */
if ((client->raw_buffer_size % 4)!=0)
client->raw_buffer_size += (4-(client->raw_buffer_size % 4));
client->raw_buffer = (char*) malloc( client->raw_buffer_size );
if(client->raw_buffer == NULL)
return FALSE;
}
/* allocate enough space to store the incoming compressed packet */
if ( client->ultra_buffer_size < toRead ) {
if ( client->ultra_buffer != NULL ) {
free( client->ultra_buffer );
}
client->ultra_buffer_size = toRead;
/* buffer needs to be aligned on 4-byte boundaries */
if ((client->ultra_buffer_size % 4)!=0)
client->ultra_buffer_size += (4-(client->ultra_buffer_size % 4));
client->ultra_buffer = (char*) malloc( client->ultra_buffer_size );
}
/* Fill the buffer, obtaining data from the server. */
if (!ReadFromRFBServer(client, client->ultra_buffer, toRead))
return FALSE;
/* uncompress the data */
uncompressedBytes = client->raw_buffer_size;
inflateResult = lzo1x_decompress_safe(
(lzo_byte *)client->ultra_buffer, toRead,
(lzo_byte *)client->raw_buffer, (lzo_uintp) &uncompressedBytes,
NULL);
/* Note that uncompressedBytes will be 0 on output overrun */
if ((rw * rh * (BPP / 8)) != uncompressedBytes)
rfbClientLog("Ultra decompressed unexpected amount of data (%d != %d)\n", (rw * rh * (BPP / 8)), uncompressedBytes);
/* Put the uncompressed contents of the update on the screen. */
if ( inflateResult == LZO_E_OK )
{
client->GotBitmap(client, (unsigned char *)client->raw_buffer, rx, ry, rw, rh);
}
else
{
rfbClientLog("ultra decompress returned error: %d\n",
inflateResult);
return FALSE;
}
return TRUE;
}
/* UltraZip is like rre in that it is composed of subrects */
static rfbBool
HandleUltraZipBPP (rfbClient* client, int rx, int ry, int rw, int rh)
{
rfbZlibHeader hdr;
int i=0;
int toRead=0;
int inflateResult=0;
unsigned char *ptr=NULL;
lzo_uint uncompressedBytes = ry + (rw * 65535);
unsigned int numCacheRects = rx;
if (!ReadFromRFBServer(client, (char *)&hdr, sz_rfbZlibHeader))
return FALSE;
toRead = rfbClientSwap32IfLE(hdr.nBytes);
if (toRead==0) return TRUE;
if (uncompressedBytes==0)
{
rfbClientLog("ultrazip error: rectangle has 0 uncomressed bytes (%dy + (%dw * 65535)) (%d rectangles)\n", ry, rw, rx);
return FALSE;
}
/* First make sure we have a large enough raw buffer to hold the
* decompressed data. In practice, with a fixed BPP, 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 < (int)(uncompressedBytes + 500)) {
if ( client->raw_buffer != NULL ) {
free( client->raw_buffer );
}
client->raw_buffer_size = uncompressedBytes + 500;
/* buffer needs to be aligned on 4-byte boundaries */
if ((client->raw_buffer_size % 4)!=0)
client->raw_buffer_size += (4-(client->raw_buffer_size % 4));
client->raw_buffer = (char*) malloc( client->raw_buffer_size );
if(client->raw_buffer == NULL)
return FALSE;
}
/* allocate enough space to store the incoming compressed packet */
if ( client->ultra_buffer_size < toRead ) {
if ( client->ultra_buffer != NULL ) {
free( client->ultra_buffer );
}
client->ultra_buffer_size = toRead;
client->ultra_buffer = (char*) malloc( client->ultra_buffer_size );
}
/* Fill the buffer, obtaining data from the server. */
if (!ReadFromRFBServer(client, client->ultra_buffer, toRead))
return FALSE;
/* uncompress the data */
uncompressedBytes = client->raw_buffer_size;
inflateResult = lzo1x_decompress_safe(
(lzo_byte *)client->ultra_buffer, toRead,
(lzo_byte *)client->raw_buffer, &uncompressedBytes, NULL);
if ( inflateResult != LZO_E_OK )
{
rfbClientLog("ultra decompress returned error: %d\n",
inflateResult);
return FALSE;
}
/* Put the uncompressed contents of the update on the screen. */
ptr = (unsigned char *)client->raw_buffer;
for (i=0; i<numCacheRects; i++)
{
unsigned short sx, sy, sw, sh;
unsigned int se;
memcpy((char *)&sx, ptr, 2); ptr += 2;
memcpy((char *)&sy, ptr, 2); ptr += 2;
memcpy((char *)&sw, ptr, 2); ptr += 2;
memcpy((char *)&sh, ptr, 2); ptr += 2;
memcpy((char *)&se, ptr, 4); ptr += 4;
sx = rfbClientSwap16IfLE(sx);
sy = rfbClientSwap16IfLE(sy);
sw = rfbClientSwap16IfLE(sw);
sh = rfbClientSwap16IfLE(sh);
se = rfbClientSwap32IfLE(se);
if (se == rfbEncodingRaw)
{
client->GotBitmap(client, (unsigned char *)ptr, sx, sy, sw, sh);
ptr += ((sw * sh) * (BPP / 8));
}
}
return TRUE;
}
#undef CARDBPP