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215 lines
7.1 KiB
215 lines
7.1 KiB
/*
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* Copyright (C) 2000 Tridia Corporation. All Rights Reserved.
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* Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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/*
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* ultrazip.c - handle ultrazip encoding.
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*
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* This file shouldn't be compiled directly. It is included multiple times by
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* rfbproto.c, each time with a different definition of the macro BPP. For
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* each value of BPP, this file defines a function which handles an zlib
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* encoded rectangle with BPP bits per pixel.
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*/
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#define HandleUltraZipBPP CONCAT2E(HandleUltraZip,BPP)
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#define HandleUltraBPP CONCAT2E(HandleUltra,BPP)
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#define CARDBPP CONCAT3E(uint,BPP,_t)
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static rfbBool
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HandleUltraBPP (rfbClient* client, int rx, int ry, int rw, int rh)
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{
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rfbZlibHeader hdr;
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int toRead=0;
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int inflateResult=0;
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lzo_uint uncompressedBytes = (( rw * rh ) * ( BPP / 8 ));
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if (!ReadFromRFBServer(client, (char *)&hdr, sz_rfbZlibHeader))
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return FALSE;
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toRead = rfbClientSwap32IfLE(hdr.nBytes);
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if (toRead==0) return TRUE;
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if (uncompressedBytes==0)
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{
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rfbClientLog("ultra error: rectangle has 0 uncomressed bytes ((%dw * %dh) * (%d / 8))\n", rw, rh, BPP);
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return FALSE;
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}
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/* First make sure we have a large enough raw buffer to hold the
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* decompressed data. In practice, with a fixed BPP, fixed frame
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* buffer size and the first update containing the entire frame
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* buffer, this buffer allocation should only happen once, on the
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* first update.
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*/
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if ( client->raw_buffer_size < (int)uncompressedBytes) {
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if ( client->raw_buffer != NULL ) {
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free( client->raw_buffer );
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}
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client->raw_buffer_size = uncompressedBytes;
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/* buffer needs to be aligned on 4-byte boundaries */
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if ((client->raw_buffer_size % 4)!=0)
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client->raw_buffer_size += (4-(client->raw_buffer_size % 4));
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client->raw_buffer = (char*) malloc( client->raw_buffer_size );
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if(client->raw_buffer == NULL)
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return FALSE;
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}
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/* allocate enough space to store the incoming compressed packet */
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if ( client->ultra_buffer_size < toRead ) {
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if ( client->ultra_buffer != NULL ) {
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free( client->ultra_buffer );
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}
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client->ultra_buffer_size = toRead;
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/* buffer needs to be aligned on 4-byte boundaries */
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if ((client->ultra_buffer_size % 4)!=0)
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client->ultra_buffer_size += (4-(client->ultra_buffer_size % 4));
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client->ultra_buffer = (char*) malloc( client->ultra_buffer_size );
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}
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/* Fill the buffer, obtaining data from the server. */
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if (!ReadFromRFBServer(client, client->ultra_buffer, toRead))
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return FALSE;
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/* uncompress the data */
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uncompressedBytes = client->raw_buffer_size;
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inflateResult = lzo1x_decompress_safe(
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(lzo_byte *)client->ultra_buffer, toRead,
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(lzo_byte *)client->raw_buffer, (lzo_uintp) &uncompressedBytes,
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NULL);
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/* Note that uncompressedBytes will be 0 on output overrun */
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if ((rw * rh * (BPP / 8)) != uncompressedBytes)
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rfbClientLog("Ultra decompressed unexpected amount of data (%d != %d)\n", (rw * rh * (BPP / 8)), uncompressedBytes);
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/* Put the uncompressed contents of the update on the screen. */
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if ( inflateResult == LZO_E_OK )
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{
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client->GotBitmap(client, (unsigned char *)client->raw_buffer, rx, ry, rw, rh);
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}
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else
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{
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rfbClientLog("ultra decompress returned error: %d\n",
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inflateResult);
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return FALSE;
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}
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return TRUE;
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}
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/* UltraZip is like rre in that it is composed of subrects */
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static rfbBool
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HandleUltraZipBPP (rfbClient* client, int rx, int ry, int rw, int rh)
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{
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rfbZlibHeader hdr;
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int i=0;
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int toRead=0;
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int inflateResult=0;
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unsigned char *ptr=NULL;
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lzo_uint uncompressedBytes = ry + (rw * 65535);
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unsigned int numCacheRects = rx;
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if (!ReadFromRFBServer(client, (char *)&hdr, sz_rfbZlibHeader))
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return FALSE;
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toRead = rfbClientSwap32IfLE(hdr.nBytes);
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if (toRead==0) return TRUE;
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if (uncompressedBytes==0)
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{
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rfbClientLog("ultrazip error: rectangle has 0 uncomressed bytes (%dy + (%dw * 65535)) (%d rectangles)\n", ry, rw, rx);
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return FALSE;
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}
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/* First make sure we have a large enough raw buffer to hold the
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* decompressed data. In practice, with a fixed BPP, fixed frame
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* buffer size and the first update containing the entire frame
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* buffer, this buffer allocation should only happen once, on the
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* first update.
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*/
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if ( client->raw_buffer_size < (int)(uncompressedBytes + 500)) {
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if ( client->raw_buffer != NULL ) {
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free( client->raw_buffer );
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}
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client->raw_buffer_size = uncompressedBytes + 500;
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/* buffer needs to be aligned on 4-byte boundaries */
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if ((client->raw_buffer_size % 4)!=0)
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client->raw_buffer_size += (4-(client->raw_buffer_size % 4));
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client->raw_buffer = (char*) malloc( client->raw_buffer_size );
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if(client->raw_buffer == NULL)
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return FALSE;
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}
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/* allocate enough space to store the incoming compressed packet */
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if ( client->ultra_buffer_size < toRead ) {
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if ( client->ultra_buffer != NULL ) {
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free( client->ultra_buffer );
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}
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client->ultra_buffer_size = toRead;
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client->ultra_buffer = (char*) malloc( client->ultra_buffer_size );
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}
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/* Fill the buffer, obtaining data from the server. */
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if (!ReadFromRFBServer(client, client->ultra_buffer, toRead))
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return FALSE;
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/* uncompress the data */
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uncompressedBytes = client->raw_buffer_size;
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inflateResult = lzo1x_decompress_safe(
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(lzo_byte *)client->ultra_buffer, toRead,
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(lzo_byte *)client->raw_buffer, &uncompressedBytes, NULL);
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if ( inflateResult != LZO_E_OK )
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{
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rfbClientLog("ultra decompress returned error: %d\n",
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inflateResult);
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return FALSE;
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}
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/* Put the uncompressed contents of the update on the screen. */
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ptr = (unsigned char *)client->raw_buffer;
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for (i=0; i<numCacheRects; i++)
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{
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unsigned short sx, sy, sw, sh;
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unsigned int se;
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memcpy((char *)&sx, ptr, 2); ptr += 2;
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memcpy((char *)&sy, ptr, 2); ptr += 2;
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memcpy((char *)&sw, ptr, 2); ptr += 2;
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memcpy((char *)&sh, ptr, 2); ptr += 2;
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memcpy((char *)&se, ptr, 4); ptr += 4;
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sx = rfbClientSwap16IfLE(sx);
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sy = rfbClientSwap16IfLE(sy);
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sw = rfbClientSwap16IfLE(sw);
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sh = rfbClientSwap16IfLE(sh);
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se = rfbClientSwap32IfLE(se);
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if (se == rfbEncodingRaw)
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{
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client->GotBitmap(client, (unsigned char *)ptr, sx, sy, sw, sh);
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ptr += ((sw * sh) * (BPP / 8));
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}
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}
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return TRUE;
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}
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#undef CARDBPP
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