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158 lines
4.3 KiB
158 lines
4.3 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*/
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/*
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* zlib.c - handle zlib 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 HandleZlibBPP CONCAT2E(HandleZlib,BPP)
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#define CARDBPP CONCAT2E(CARD,BPP)
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static Bool
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HandleZlibBPP (int rx, int ry, int rw, int rh)
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{
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rfbZlibHeader hdr;
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int remaining;
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int inflateResult;
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int toRead;
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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 ( raw_buffer_size < (( rw * rh ) * ( BPP / 8 ))) {
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if ( raw_buffer != NULL ) {
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free( raw_buffer );
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}
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raw_buffer_size = (( rw * rh ) * ( BPP / 8 ));
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raw_buffer = (char*) malloc( raw_buffer_size );
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}
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if (!ReadFromRFBServer((char *)&hdr, sz_rfbZlibHeader))
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return False;
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remaining = Swap32IfLE(hdr.nBytes);
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/* Need to initialize the decompressor state. */
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decompStream.next_in = ( Bytef * )buffer;
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decompStream.avail_in = 0;
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decompStream.next_out = ( Bytef * )raw_buffer;
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decompStream.avail_out = raw_buffer_size;
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decompStream.data_type = Z_BINARY;
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/* Initialize the decompression stream structures on the first invocation. */
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if ( decompStreamInited == False ) {
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inflateResult = inflateInit( &decompStream );
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if ( inflateResult != Z_OK ) {
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fprintf(stderr,
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"inflateInit returned error: %d, msg: %s\n",
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inflateResult,
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decompStream.msg);
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return False;
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}
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decompStreamInited = True;
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}
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inflateResult = Z_OK;
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/* Process buffer full of data until no more to process, or
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* some type of inflater error, or Z_STREAM_END.
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*/
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while (( remaining > 0 ) &&
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( inflateResult == Z_OK )) {
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if ( remaining > BUFFER_SIZE ) {
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toRead = BUFFER_SIZE;
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}
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else {
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toRead = remaining;
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}
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/* Fill the buffer, obtaining data from the server. */
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if (!ReadFromRFBServer(buffer,toRead))
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return False;
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decompStream.next_in = ( Bytef * )buffer;
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decompStream.avail_in = toRead;
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/* Need to uncompress buffer full. */
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inflateResult = inflate( &decompStream, Z_SYNC_FLUSH );
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/* We never supply a dictionary for compression. */
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if ( inflateResult == Z_NEED_DICT ) {
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fprintf(stderr,"zlib inflate needs a dictionary!\n");
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return False;
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}
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if ( inflateResult < 0 ) {
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fprintf(stderr,
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"zlib inflate returned error: %d, msg: %s\n",
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inflateResult,
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decompStream.msg);
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return False;
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}
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/* Result buffer allocated to be at least large enough. We should
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* never run out of space!
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*/
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if (( decompStream.avail_in > 0 ) &&
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( decompStream.avail_out <= 0 )) {
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fprintf(stderr,"zlib inflate ran out of space!\n");
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return False;
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}
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remaining -= toRead;
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} /* while ( remaining > 0 ) */
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if ( inflateResult == Z_OK ) {
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/* Put the uncompressed contents of the update on the screen. */
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CopyDataToScreen(raw_buffer, rx, ry, rw, rh);
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}
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else {
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fprintf(stderr,
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"zlib inflate returned error: %d, msg: %s\n",
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inflateResult,
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decompStream.msg);
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return False;
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}
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return True;
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}
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