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-rw-r--r--libvncclient/ultra.c214
1 files changed, 214 insertions, 0 deletions
diff --git a/libvncclient/ultra.c b/libvncclient/ultra.c
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+++ b/libvncclient/ultra.c
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+/*
+ * 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.
+ */
+
+#ifdef LIBVNCSERVER_HAVE_LIBZ
+
+/*
+ * 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;
+ int 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 < 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 );
+ }
+
+ /* 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(
+ (lzo_byte *)client->ultra_buffer, toRead,
+ (lzo_byte *)client->raw_buffer, (lzo_uintp) &uncompressedBytes,
+ NULL);
+
+
+ if ((rw * rh * (BPP / 8)) != uncompressedBytes)
+ rfbClientLog("Ultra decompressed too little (%d < %d)", (rw * rh * (BPP / 8)), uncompressedBytes);
+
+ /* Put the uncompressed contents of the update on the screen. */
+ if ( inflateResult == LZO_E_OK )
+ {
+ CopyRectangle(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;
+ int 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 < (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 );
+ }
+
+
+ /* 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(
+ (lzo_byte *)client->ultra_buffer, toRead,
+ (lzo_byte *)client->raw_buffer, (lzo_uintp) &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)
+ {
+ CopyRectangle(client, (unsigned char *)ptr, sx, sy, sw, sh);
+ ptr += ((sw * sh) * (BPP / 8));
+ }
+ }
+
+ return TRUE;
+}
+
+#undef CARDBPP
+
+#endif
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