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

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10 KiB

/*
* Copyright (C) 2005 Johannes E. Schindelin. 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
/*
* zrle.c - handle zrle 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 zrle
* encoded rectangle with BPP bits per pixel.
*/
#ifndef REALBPP
#define REALBPP BPP
#endif
#if !defined(UNCOMP) || UNCOMP==0
#define HandleZRLE CONCAT2E(HandleZRLE,REALBPP)
#define HandleZRLETile CONCAT2E(HandleZRLETile,REALBPP)
#elif UNCOMP>0
#define HandleZRLE CONCAT3E(HandleZRLE,REALBPP,Down)
#define HandleZRLETile CONCAT3E(HandleZRLETile,REALBPP,Down)
#else
#define HandleZRLE CONCAT3E(HandleZRLE,REALBPP,Up)
#define HandleZRLETile CONCAT3E(HandleZRLETile,REALBPP,Up)
#endif
#define CARDBPP CONCAT3E(uint,BPP,_t)
#define CARDREALBPP CONCAT3E(uint,REALBPP,_t)
#define ENDIAN_LITTLE 0
#define ENDIAN_BIG 1
#define ENDIAN_NO 2
#define ZYWRLE_ENDIAN ENDIAN_LITTLE
#undef END_FIX
#if ZYWRLE_ENDIAN == ENDIAN_LITTLE
# define END_FIX LE
#elif ZYWRLE_ENDIAN == ENDIAN_BIG
# define END_FIX BE
#else
# define END_FIX NE
#endif
#define __RFB_CONCAT3E(a,b,c) CONCAT3E(a,b,c)
#define __RFB_CONCAT2E(a,b) CONCAT2E(a,b)
#undef CPIXEL
#if REALBPP != BPP
#if UNCOMP == 0
#define CPIXEL REALBPP
#elif UNCOMP>0
#define CPIXEL CONCAT2E(REALBPP,Down)
#else
#define CPIXEL CONCAT2E(REALBPP,Up)
#endif
#endif
#define PIXEL_T __RFB_CONCAT3E(uint,BPP,_t)
#if BPP!=8
#define ZYWRLE_DECODE 1
#include "zywrletemplate.c"
#endif
#undef CPIXEL
static int HandleZRLETile(rfbClient* client,
uint8_t* buffer,size_t buffer_length,
int x,int y,int w,int h);
static rfbBool
HandleZRLE (rfbClient* client, int rx, int ry, int rw, int rh)
{
rfbZRLEHeader header;
int remaining;
int inflateResult;
int toRead;
int min_buffer_size = rw * rh * (REALBPP / 8) * 2;
/* 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 );
}
if (!ReadFromRFBServer(client, (char *)&header, sz_rfbZRLEHeader))
return FALSE;
remaining = rfbClientSwap32IfLE(header.length);
/* Need to initialize the decompressor state. */
client->decompStream.next_in = ( Bytef * )client->buffer;
client->decompStream.avail_in = 0;
client->decompStream.next_out = ( Bytef * )client->raw_buffer;
client->decompStream.avail_out = client->raw_buffer_size;
client->decompStream.data_type = Z_BINARY;
/* Initialize the decompression stream structures on the first invocation. */
if ( client->decompStreamInited == FALSE ) {
inflateResult = inflateInit( &client->decompStream );
if ( inflateResult != Z_OK ) {
rfbClientLog(
"inflateInit returned error: %d, msg: %s\n",
inflateResult,
client->decompStream.msg);
return FALSE;
}
client->decompStreamInited = TRUE;
}
inflateResult = Z_OK;
/* Process buffer full of data until no more to process, or
* some type of inflater error, or Z_STREAM_END.
*/
while (( remaining > 0 ) &&
( inflateResult == Z_OK )) {
if ( remaining > RFB_BUFFER_SIZE ) {
toRead = RFB_BUFFER_SIZE;
}
else {
toRead = remaining;
}
/* Fill the buffer, obtaining data from the server. */
if (!ReadFromRFBServer(client, client->buffer,toRead))
return FALSE;
client->decompStream.next_in = ( Bytef * )client->buffer;
client->decompStream.avail_in = toRead;
/* Need to uncompress buffer full. */
inflateResult = inflate( &client->decompStream, Z_SYNC_FLUSH );
/* We never supply a dictionary for compression. */
if ( inflateResult == Z_NEED_DICT ) {
rfbClientLog("zlib inflate needs a dictionary!\n");
return FALSE;
}
if ( inflateResult < 0 ) {
rfbClientLog(
"zlib inflate returned error: %d, msg: %s\n",
inflateResult,
client->decompStream.msg);
return FALSE;
}
/* Result buffer allocated to be at least large enough. We should
* never run out of space!
*/
if (( client->decompStream.avail_in > 0 ) &&
( client->decompStream.avail_out <= 0 )) {
rfbClientLog("zlib inflate ran out of space!\n");
return FALSE;
}
remaining -= toRead;
} /* while ( remaining > 0 ) */
if ( inflateResult == Z_OK ) {
char* buf=client->raw_buffer;
int i,j;
remaining = client->raw_buffer_size-client->decompStream.avail_out;
for(j=0; j<rh; j+=rfbZRLETileHeight)
for(i=0; i<rw; i+=rfbZRLETileWidth) {
int subWidth=(i+rfbZRLETileWidth>rw)?rw-i:rfbZRLETileWidth;
int subHeight=(j+rfbZRLETileHeight>rh)?rh-j:rfbZRLETileHeight;
int result=HandleZRLETile(client,(uint8_t *)buf,remaining,rx+i,ry+j,subWidth,subHeight);
if(result<0) {
rfbClientLog("ZRLE decoding failed (%d)\n",result);
return TRUE;
return FALSE;
}
buf+=result;
remaining-=result;
}
}
else {
rfbClientLog(
"zlib inflate returned error: %d, msg: %s\n",
inflateResult,
client->decompStream.msg);
return FALSE;
}
return TRUE;
}
#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 int HandleZRLETile(rfbClient* client,
uint8_t* buffer,size_t buffer_length,
int x,int y,int w,int h) {
uint8_t* buffer_copy = buffer;
uint8_t* buffer_end = buffer+buffer_length;
uint8_t type;
#if BPP!=8
uint8_t zywrle_level = (client->appData.qualityLevel & 0x80) ?
0 : (3 - client->appData.qualityLevel / 3);
#endif
if(buffer_length<1)
return -2;
type = *buffer;
buffer++;
{
if( type == 0 ) /* raw */
#if BPP!=8
if( zywrle_level > 0 ){
CARDBPP* pFrame = (CARDBPP*)client->frameBuffer + y*client->width+x;
int ret;
client->appData.qualityLevel |= 0x80;
ret = HandleZRLETile(client, buffer, buffer_end-buffer, x, y, w, h);
client->appData.qualityLevel &= 0x7F;
if( ret < 0 ){
return ret;
}
ZYWRLE_SYNTHESIZE( pFrame, pFrame, w, h, client->width, zywrle_level, (int*)client->zlib_buffer );
buffer += ret;
}else
#endif
{
#if REALBPP!=BPP
int i,j;
if(1+w*h*REALBPP/8>buffer_length) {
rfbClientLog("expected %d bytes, got only %d (%dx%d)\n",1+w*h*REALBPP/8,buffer_length,w,h);
return -3;
}
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);
buffer+=w*h*REALBPP/8;
#endif
}
else if( type == 1 ) /* solid */
{
CARDBPP color = UncompressCPixel(buffer);
if(1+REALBPP/8>buffer_length)
return -4;
client->GotFillRect(client, x, y, w, h, color);
buffer+=REALBPP/8;
}
else if( (type >= 2)&&(type <= 127) ) /* packed Palette */
{
CARDBPP palette[16];
int i,j,shift,
bpp=(type>4?(type>16?8:4):(type>2?2:1)),
mask=(1<<bpp)-1,
divider=(8/bpp);
if(1+type*REALBPP/8+((w+divider-1)/divider)*h>buffer_length)
return -5;
/* read palette */
for(i=0; i<type; i++,buffer+=REALBPP/8)
palette[i] = UncompressCPixel(buffer);
/* 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++;
}
}
/* case 17 ... 127: not used, but valid */
else if( type == 128 ) /* plain RLE */
{
int i=0,j=0;
while(j<h) {
int color,length;
/* read color */
if(buffer+REALBPP/8+1>buffer_end)
return -7;
color = UncompressCPixel(buffer);
buffer+=REALBPP/8;
/* read run length */
length=1;
while(*buffer==0xff) {
if(buffer+1>=buffer_end)
return -8;
length+=*buffer;
buffer++;
}
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 ZRLE corruption\n");
}
}
else if( type == 129 ) /* unused */
{
return -8;
}
else if( type >= 130 ) /* palette RLE */
{
CARDBPP palette[128];
int i,j;
if(2+(type-128)*REALBPP/8>buffer_length)
return -9;
/* read palette */
for(i=0; i<type-128; i++,buffer+=REALBPP/8)
palette[i] = UncompressCPixel(buffer);
/* read palettized pixels */
i=j=0;
while(j<h) {
int color,length;
/* read color */
if(buffer>=buffer_end)
return -10;
color = palette[(*buffer)&0x7f];
length=1;
if(*buffer&0x80) {
if(buffer+1>=buffer_end)
return -11;
buffer++;
/* read run length */
while(*buffer==0xff) {
if(buffer+1>=buffer_end)
return -8;
length+=*buffer;
buffer++;
}
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 ZRLE corruption\n");
}
}
}
return buffer-buffer_copy;
}
#undef CARDBPP
#undef CARDREALBPP
#undef HandleZRLE
#undef HandleZRLETile
#undef UncompressCPixel
#endif
#undef UNCOMP
#undef REALBPP