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-rw-r--r--nxcomp/ChangeGC.cpp172
1 files changed, 172 insertions, 0 deletions
diff --git a/nxcomp/ChangeGC.cpp b/nxcomp/ChangeGC.cpp
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+++ b/nxcomp/ChangeGC.cpp
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+/**************************************************************************/
+/* */
+/* Copyright (c) 2001, 2010 NoMachine, http://www.nomachine.com/. */
+/* */
+/* NXCOMP, NX protocol compression and NX extensions to this software */
+/* are copyright of NoMachine. Redistribution and use of the present */
+/* software is allowed according to terms specified in the file LICENSE */
+/* which comes in the source distribution. */
+/* */
+/* Check http://www.nomachine.com/licensing.html for applicability. */
+/* */
+/* NX and NoMachine are trademarks of Medialogic S.p.A. */
+/* */
+/* All rights reserved. */
+/* */
+/**************************************************************************/
+
+#include "ChangeGC.h"
+
+#include "ClientCache.h"
+
+#include "EncodeBuffer.h"
+#include "DecodeBuffer.h"
+
+//
+// Set the verbosity level.
+//
+
+#define PANIC
+#define WARNING
+#undef TEST
+#undef DEBUG
+#undef DUMP
+
+//
+// Here are the methods to handle messages' content.
+//
+
+int ChangeGCStore::parseIdentity(Message *message, const unsigned char *buffer,
+ unsigned int size, int bigEndian) const
+{
+ ChangeGCMessage *changeGC = (ChangeGCMessage *) message;
+
+ //
+ // Here is the fingerprint.
+ //
+
+ changeGC -> gcontext = GetULONG(buffer + 4, bigEndian);
+ changeGC -> value_mask = GetULONG(buffer + 8, bigEndian);
+
+ //
+ // Clear the unused bytes carried in the
+ // payload to increase the effectiveness
+ // of the caching algorithm.
+ //
+
+ if ((int) size > dataOffset)
+ {
+ #ifdef DEBUG
+ *logofs << name() << ": Removing unused bytes from the "
+ << "data payload.\n" << logofs_flush;
+ #endif
+
+ changeGC -> value_mask &= (1 << 23) - 1;
+
+ unsigned int mask = 0x1;
+ unsigned char *source = (unsigned char *) buffer + CHANGEGC_DATA_OFFSET;
+ unsigned long value = 0;
+
+ for (unsigned int i = 0; i < 23; i++)
+ {
+ if (changeGC -> value_mask & mask)
+ {
+ value = GetULONG(source, bigEndian);
+
+ value &= (0xffffffff >> (32 - CREATEGC_FIELD_WIDTH[i]));
+
+ PutULONG(value, source, bigEndian);
+
+ source += 4;
+ }
+
+ mask <<= 1;
+ }
+ }
+
+ #ifdef DEBUG
+ *logofs << name() << ": Parsed Identity for message at "
+ << this << ".\n" << logofs_flush;
+ #endif
+
+ return 1;
+}
+
+int ChangeGCStore::unparseIdentity(const Message *message, unsigned char *buffer,
+ unsigned int size, int bigEndian) const
+{
+ ChangeGCMessage *changeGC = (ChangeGCMessage *) message;
+
+ //
+ // Fill all the message's fields.
+ //
+
+ PutULONG(changeGC -> gcontext, buffer + 4, bigEndian);
+ PutULONG(changeGC -> value_mask, buffer + 8, bigEndian);
+
+ #ifdef DEBUG
+ *logofs << name() << ": Unparsed identity for message at "
+ << this << ".\n" << logofs_flush;
+ #endif
+
+ return 1;
+}
+
+void ChangeGCStore::dumpIdentity(const Message *message) const
+{
+ #ifdef DUMP
+
+ ChangeGCMessage *changeGC = (ChangeGCMessage *) message;
+
+ *logofs << name() << ": Identity gcontext " << changeGC -> gcontext
+ << ", mask " << changeGC -> value_mask << ", size "
+ << changeGC -> size_ << ".\n" << logofs_flush;
+ #endif
+}
+
+void ChangeGCStore::identityChecksum(const Message *message, const unsigned char *buffer,
+ unsigned int size, int bigEndian) const
+{
+/*
+ md5_append(md5_state_, buffer + 4, 8);
+*/
+ md5_append(md5_state_, buffer + 8, 4);
+}
+
+void ChangeGCStore::updateIdentity(EncodeBuffer &encodeBuffer, const Message *message,
+ const Message *cachedMessage,
+ ChannelCache *channelCache) const
+{
+ ChangeGCMessage *changeGC = (ChangeGCMessage *) message;
+ ChangeGCMessage *cachedChangeGC = (ChangeGCMessage *) cachedMessage;
+
+ ClientCache *clientCache = (ClientCache *) channelCache;
+
+ #ifdef TEST
+ *logofs << name() << ": Encoding value " << changeGC -> gcontext
+ << " as gcontext field.\n" << logofs_flush;
+ #endif
+
+ encodeBuffer.encodeXidValue(changeGC -> gcontext, clientCache -> gcCache);
+
+ cachedChangeGC -> gcontext = changeGC -> gcontext;
+}
+
+void ChangeGCStore::updateIdentity(DecodeBuffer &decodeBuffer, const Message *message,
+ ChannelCache *channelCache) const
+{
+ ChangeGCMessage *changeGC = (ChangeGCMessage *) message;
+
+ ClientCache *clientCache = (ClientCache *) channelCache;
+
+ unsigned int value;
+
+ decodeBuffer.decodeXidValue(value, clientCache -> gcCache);
+
+ changeGC -> gcontext = value;
+
+ #ifdef DEBUG
+ *logofs << name() << ": Decoded value " << changeGC -> gcontext
+ << " as gcontext field.\n" << logofs_flush;
+ #endif
+}