summaryrefslogtreecommitdiffstats
path: root/krfb/libvncserver/zlib.c
diff options
context:
space:
mode:
Diffstat (limited to 'krfb/libvncserver/zlib.c')
-rw-r--r--krfb/libvncserver/zlib.c304
1 files changed, 0 insertions, 304 deletions
diff --git a/krfb/libvncserver/zlib.c b/krfb/libvncserver/zlib.c
deleted file mode 100644
index 5661d265..00000000
--- a/krfb/libvncserver/zlib.c
+++ /dev/null
@@ -1,304 +0,0 @@
-/*
- * zlib.c
- *
- * Routines to implement zlib based encoding (deflate).
- */
-
-/*
- * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
- * USA.
- *
- * For the latest source code, please check:
- *
- * http://www.developVNC.org/
- *
- * or send email to [email protected].
- */
-
-#include <stdio.h>
-#include "rfb.h"
-
-/*
- * zlibBeforeBuf contains pixel data in the client's format.
- * zlibAfterBuf contains the zlib (deflated) encoding version.
- * If the zlib compressed/encoded version is
- * larger than the raw data or if it exceeds zlibAfterBufSize then
- * raw encoding is used instead.
- */
-
-static int zlibBeforeBufSize = 0;
-static char *zlibBeforeBuf = NULL;
-
-static int zlibAfterBufSize = 0;
-static char *zlibAfterBuf = NULL;
-static int zlibAfterBufLen;
-
-/*
- * rfbSendOneRectEncodingZlib - send a given rectangle using one Zlib
- * rectangle encoding.
- */
-
-Bool
-rfbSendOneRectEncodingZlib(cl, x, y, w, h)
- rfbClientPtr cl;
- int x, y, w, h;
-{
- rfbFramebufferUpdateRectHeader rect;
- rfbZlibHeader hdr;
- int deflateResult;
- int previousOut;
- int i;
- char *fbptr = (cl->screen->frameBuffer + (cl->screen->paddedWidthInBytes * y)
- + (x * (cl->screen->bitsPerPixel / 8)));
-
- int maxRawSize;
- int maxCompSize;
-
- maxRawSize = (cl->screen->width * cl->screen->height
- * (cl->format.bitsPerPixel / 8));
-
- if (zlibBeforeBufSize < maxRawSize) {
- zlibBeforeBufSize = maxRawSize;
- if (zlibBeforeBuf == NULL)
- zlibBeforeBuf = (char *)malloc(zlibBeforeBufSize);
- else
- zlibBeforeBuf = (char *)realloc(zlibBeforeBuf, zlibBeforeBufSize);
- }
-
- /* zlib compression is not useful for very small data sets.
- * So, we just send these raw without any compression.
- */
- if (( w * h * (cl->screen->bitsPerPixel / 8)) <
- VNC_ENCODE_ZLIB_MIN_COMP_SIZE ) {
-
- int result;
-
- /* The translation function (used also by the in raw encoding)
- * requires 4/2/1 byte alignment in the output buffer (which is
- * updateBuf for the raw encoding) based on the bitsPerPixel of
- * the viewer/client. This prevents SIGBUS errors on some
- * architectures like SPARC, PARISC...
- */
- if (( cl->format.bitsPerPixel > 8 ) &&
- ( cl->ublen % ( cl->format.bitsPerPixel / 8 )) != 0 ) {
- if (!rfbSendUpdateBuf(cl))
- return FALSE;
- }
-
- result = rfbSendRectEncodingRaw(cl, x, y, w, h);
-
- return result;
-
- }
-
- /*
- * zlib requires output buffer to be slightly larger than the input
- * buffer, in the worst case.
- */
- maxCompSize = maxRawSize + (( maxRawSize + 99 ) / 100 ) + 12;
-
- if (zlibAfterBufSize < maxCompSize) {
- zlibAfterBufSize = maxCompSize;
- if (zlibAfterBuf == NULL)
- zlibAfterBuf = (char *)malloc(zlibAfterBufSize);
- else
- zlibAfterBuf = (char *)realloc(zlibAfterBuf, zlibAfterBufSize);
- }
-
- /*
- * Convert pixel data to client format.
- */
- (*cl->translateFn)(cl->translateLookupTable, &cl->screen->rfbServerFormat,
- &cl->format, fbptr, zlibBeforeBuf,
- cl->screen->paddedWidthInBytes, w, h);
-
- cl->compStream.next_in = ( Bytef * )zlibBeforeBuf;
- cl->compStream.avail_in = w * h * (cl->format.bitsPerPixel / 8);
- cl->compStream.next_out = ( Bytef * )zlibAfterBuf;
- cl->compStream.avail_out = maxCompSize;
- cl->compStream.data_type = Z_BINARY;
-
- /* Initialize the deflation state. */
- if ( cl->compStreamInited == FALSE ) {
-
- cl->compStream.total_in = 0;
- cl->compStream.total_out = 0;
- cl->compStream.zalloc = Z_NULL;
- cl->compStream.zfree = Z_NULL;
- cl->compStream.opaque = Z_NULL;
-
- deflateInit2( &(cl->compStream),
- cl->zlibCompressLevel,
- Z_DEFLATED,
- MAX_WBITS,
- MAX_MEM_LEVEL,
- Z_DEFAULT_STRATEGY );
- /* deflateInit( &(cl->compStream), Z_BEST_COMPRESSION ); */
- /* deflateInit( &(cl->compStream), Z_BEST_SPEED ); */
- cl->compStreamInited = TRUE;
-
- }
-
- previousOut = cl->compStream.total_out;
-
- /* Perform the compression here. */
- deflateResult = deflate( &(cl->compStream), Z_SYNC_FLUSH );
-
- /* Find the total size of the resulting compressed data. */
- zlibAfterBufLen = cl->compStream.total_out - previousOut;
-
- if ( deflateResult != Z_OK ) {
- rfbLog("zlib deflation error: %s\n", cl->compStream.msg);
- return FALSE;
- }
-
- /* Note that it is not possible to switch zlib parameters based on
- * the results of the compression pass. The reason is
- * that we rely on the compressor and decompressor states being
- * in sync. Compressing and then discarding the results would
- * cause lose of synchronization.
- */
-
- /* Update statics */
- cl->rfbRectanglesSent[rfbEncodingZlib]++;
- cl->rfbBytesSent[rfbEncodingZlib] += (sz_rfbFramebufferUpdateRectHeader
- + sz_rfbZlibHeader + zlibAfterBufLen);
-
- if (cl->ublen + sz_rfbFramebufferUpdateRectHeader + sz_rfbZlibHeader
- > UPDATE_BUF_SIZE)
- {
- if (!rfbSendUpdateBuf(cl))
- return FALSE;
- }
-
- rect.r.x = Swap16IfLE(x);
- rect.r.y = Swap16IfLE(y);
- rect.r.w = Swap16IfLE(w);
- rect.r.h = Swap16IfLE(h);
- rect.encoding = Swap32IfLE(rfbEncodingZlib);
-
- memcpy(&cl->updateBuf[cl->ublen], (char *)&rect,
- sz_rfbFramebufferUpdateRectHeader);
- cl->ublen += sz_rfbFramebufferUpdateRectHeader;
-
- hdr.nBytes = Swap32IfLE(zlibAfterBufLen);
-
- memcpy(&cl->updateBuf[cl->ublen], (char *)&hdr, sz_rfbZlibHeader);
- cl->ublen += sz_rfbZlibHeader;
-
- for (i = 0; i < zlibAfterBufLen;) {
-
- int bytesToCopy = UPDATE_BUF_SIZE - cl->ublen;
-
- if (i + bytesToCopy > zlibAfterBufLen) {
- bytesToCopy = zlibAfterBufLen - i;
- }
-
- memcpy(&cl->updateBuf[cl->ublen], &zlibAfterBuf[i], bytesToCopy);
-
- cl->ublen += bytesToCopy;
- i += bytesToCopy;
-
- if (cl->ublen == UPDATE_BUF_SIZE) {
- if (!rfbSendUpdateBuf(cl))
- return FALSE;
- }
- }
-
- return TRUE;
-
-}
-
-
-/*
- * rfbSendRectEncodingZlib - send a given rectangle using one or more
- * Zlib encoding rectangles.
- */
-
-Bool
-rfbSendRectEncodingZlib(cl, x, y, w, h)
- rfbClientPtr cl;
- int x, y, w, h;
-{
- int maxLines;
- int linesRemaining;
- rfbRectangle partialRect;
-
- partialRect.x = x;
- partialRect.y = y;
- partialRect.w = w;
- partialRect.h = h;
-
- /* Determine maximum pixel/scan lines allowed per rectangle. */
- maxLines = ( ZLIB_MAX_SIZE(w) / w );
-
- /* Initialize number of scan lines left to do. */
- linesRemaining = h;
-
- /* Loop until all work is done. */
- while ( linesRemaining > 0 ) {
-
- int linesToComp;
-
- if ( maxLines < linesRemaining )
- linesToComp = maxLines;
- else
- linesToComp = linesRemaining;
-
- partialRect.h = linesToComp;
-
- /* Encode (compress) and send the next rectangle. */
- if ( ! rfbSendOneRectEncodingZlib( cl,
- partialRect.x,
- partialRect.y,
- partialRect.w,
- partialRect.h )) {
-
- return FALSE;
- }
-
- /* Technically, flushing the buffer here is not extrememly
- * efficient. However, this improves the overall throughput
- * of the system over very slow networks. By flushing
- * the buffer with every maximum size zlib rectangle, we
- * improve the pipelining usage of the server CPU, network,
- * and viewer CPU components. Insuring that these components
- * are working in parallel actually improves the performance
- * seen by the user.
- * Since, zlib is most useful for slow networks, this flush
- * is appropriate for the desired behavior of the zlib encoding.
- */
- if (( cl->ublen > 0 ) &&
- ( linesToComp == maxLines )) {
- if (!rfbSendUpdateBuf(cl)) {
-
- return FALSE;
- }
- }
-
- /* Update remaining and incremental rectangle location. */
- linesRemaining -= linesToComp;
- partialRect.y += linesToComp;
-
- }
-
- return TRUE;
-
-}
-
-
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-11 11:39:34 +0000