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Diffstat (limited to 'nxcomp/ChangeGCCompat.cpp')
| -rw-r--r-- | nxcomp/ChangeGCCompat.cpp | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/nxcomp/ChangeGCCompat.cpp b/nxcomp/ChangeGCCompat.cpp new file mode 100644 index 000000000..ca2973774 --- /dev/null +++ b/nxcomp/ChangeGCCompat.cpp @@ -0,0 +1,131 @@ +/**************************************************************************/ +/* */ +/* 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 "ChangeGCCompat.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 ChangeGCCompatStore::parseIdentity(Message *message, const unsigned char *buffer, + unsigned int size, int bigEndian) const +{ + ChangeGCCompatMessage *changeGC = (ChangeGCCompatMessage *) 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 ChangeGCCompatStore::unparseIdentity(const Message *message, unsigned char *buffer, + unsigned int size, int bigEndian) const +{ + ChangeGCCompatMessage *changeGC = (ChangeGCCompatMessage *) 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 ChangeGCCompatStore::dumpIdentity(const Message *message) const +{ + #ifdef DUMP + + ChangeGCCompatMessage *changeGC = (ChangeGCCompatMessage *) message; + + *logofs << name() << ": Identity gcontext " << changeGC -> gcontext + << ", mask " << changeGC -> value_mask << ", size " + << changeGC -> size_ << ".\n" << logofs_flush; + #endif +} + +void ChangeGCCompatStore::identityChecksum(const Message *message, const unsigned char *buffer, + unsigned int size, int bigEndian) const +{ + md5_append(md5_state_, buffer + 4, 8); +} |