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-rw-r--r--krdc/vnc/zlib.c157
1 files changed, 157 insertions, 0 deletions
diff --git a/krdc/vnc/zlib.c b/krdc/vnc/zlib.c
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+++ b/krdc/vnc/zlib.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.
+ */
+
+/*
+ * zlib.c - handle zlib 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 HandleZlibBPP CONCAT2E(HandleZlib,BPP)
+#define CARDBPP CONCAT2E(CARD,BPP)
+
+static Bool
+HandleZlibBPP (int rx, int ry, int rw, int rh)
+{
+ rfbZlibHeader hdr;
+ int remaining;
+ int inflateResult;
+ int toRead;
+
+ /* 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 ( raw_buffer_size < (( rw * rh ) * ( BPP / 8 ))) {
+
+ if ( raw_buffer != NULL ) {
+
+ free( raw_buffer );
+
+ }
+
+ raw_buffer_size = (( rw * rh ) * ( BPP / 8 ));
+ raw_buffer = (char*) malloc( raw_buffer_size );
+
+ }
+
+ if (!ReadFromRFBServer((char *)&hdr, sz_rfbZlibHeader))
+ return False;
+
+ remaining = Swap32IfLE(hdr.nBytes);
+
+ /* Need to initialize the decompressor state. */
+ decompStream.next_in = ( Bytef * )buffer;
+ decompStream.avail_in = 0;
+ decompStream.next_out = ( Bytef * )raw_buffer;
+ decompStream.avail_out = raw_buffer_size;
+ decompStream.data_type = Z_BINARY;
+
+ /* Initialize the decompression stream structures on the first invocation. */
+ if ( decompStreamInited == False ) {
+
+ inflateResult = inflateInit( &decompStream );
+
+ if ( inflateResult != Z_OK ) {
+ fprintf(stderr,
+ "inflateInit returned error: %d, msg: %s\n",
+ inflateResult,
+ decompStream.msg);
+ return False;
+ }
+
+ 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 > BUFFER_SIZE ) {
+ toRead = BUFFER_SIZE;
+ }
+ else {
+ toRead = remaining;
+ }
+
+ /* Fill the buffer, obtaining data from the server. */
+ if (!ReadFromRFBServer(buffer,toRead))
+ return False;
+
+ decompStream.next_in = ( Bytef * )buffer;
+ decompStream.avail_in = toRead;
+
+ /* Need to uncompress buffer full. */
+ inflateResult = inflate( &decompStream, Z_SYNC_FLUSH );
+
+ /* We never supply a dictionary for compression. */
+ if ( inflateResult == Z_NEED_DICT ) {
+ fprintf(stderr,"zlib inflate needs a dictionary!\n");
+ return False;
+ }
+ if ( inflateResult < 0 ) {
+ fprintf(stderr,
+ "zlib inflate returned error: %d, msg: %s\n",
+ inflateResult,
+ decompStream.msg);
+ return False;
+ }
+
+ /* Result buffer allocated to be at least large enough. We should
+ * never run out of space!
+ */
+ if (( decompStream.avail_in > 0 ) &&
+ ( decompStream.avail_out <= 0 )) {
+ fprintf(stderr,"zlib inflate ran out of space!\n");
+ return False;
+ }
+
+ remaining -= toRead;
+
+ } /* while ( remaining > 0 ) */
+
+ if ( inflateResult == Z_OK ) {
+
+ /* Put the uncompressed contents of the update on the screen. */
+ CopyDataToScreen(raw_buffer, rx, ry, rw, rh);
+
+ }
+ else {
+
+ fprintf(stderr,
+ "zlib inflate returned error: %d, msg: %s\n",
+ inflateResult,
+ decompStream.msg);
+ return False;
+
+ }
+
+ return True;
+}