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/**************************************************************************/
/* */
/* Copyright (c) 2001, 2009 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
}
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