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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 "ProxyReadBuffer.h"
#include "Transport.h"
//
// Set the verbosity level. You also
// need to define DUMP in Misc.cpp
// if DUMP is defined here.
//
#define WARNING
#define PANIC
#undef TEST
#undef DEBUG
#undef DUMP
unsigned int ProxyReadBuffer::suggestedLength(unsigned int pendingLength)
{
//
// Always read all the data that
// is available.
//
int readable = transport_ -> readable();
unsigned int readLength = (readable == -1 ? 0 : (unsigned int) readable);
if (readLength < pendingLength)
{
readLength = pendingLength;
}
//
// Even if the readable data is not
// enough to make a complete message,
// resize the buffer to accomodate
// it all.
//
if (pendingLength < remaining_)
{
readLength = remaining_;
}
return readLength;
}
int ProxyReadBuffer::locateMessage(const unsigned char *start,
const unsigned char *end,
unsigned int &controlLength,
unsigned int &dataLength,
unsigned int &trailerLength)
{
unsigned int lengthLength = 0;
const unsigned char *nextSrc = start;
unsigned char next;
dataLength = 0;
#ifdef TEST
*logofs << "ProxyReadBuffer: Locating message for FD#"
<< transport_ -> fd() << " with " << end - start
<< " bytes.\n" << logofs_flush;
#endif
//
// Use something like the following if
// you are looking for errors.
//
#ifdef DUMP
if (control -> ProxyMode == proxy_server && start < end &&
transport_ -> fd() == 6 || transport_ -> fd() == 11)
{
*logofs << "ProxyReadBuffer: Partial checksums are:\n";
DumpBlockChecksums(start, end - start, 256);
*logofs << logofs_flush;
}
#endif
do
{
if (nextSrc >= end)
{
remaining_ = 1;
#ifdef TEST
*logofs << "ProxyReadBuffer: No message was located "
<< "with remaining " << remaining_ << ".\n"
<< logofs_flush;
#endif
return 0;
}
next = *nextSrc++;
dataLength <<= 7;
dataLength |= (unsigned int) (next & 0x7f);
lengthLength++;
}
while (next & 0x80);
unsigned int totalLength;
if (dataLength == 0)
{
trailerLength = 0;
controlLength = 3;
totalLength = controlLength;
}
else
{
trailerLength = lengthLength;
controlLength = 0;
totalLength = dataLength + trailerLength;
}
if (start + totalLength > end)
{
//
// When having to decompress a ZLIB stream,
// a single byte can be enough to complete
// the frame.
//
if (control -> RemoteStreamCompression == 0)
{
remaining_ = totalLength - (end - start);
}
else
{
remaining_ = 1;
}
#ifdef TEST
*logofs << "ProxyReadBuffer: No message was located "
<< "with remaining " << remaining_ << ".\n"
<< logofs_flush;
#endif
return 0;
}
else
{
#ifdef DUMP
*logofs << "ProxyReadBuffer: Received " << totalLength << " bytes of data "
<< "with checksum ";
DumpChecksum(start, totalLength);
*logofs << " on proxy FD#" << transport_ -> fd() << ".\n" << logofs_flush;
#endif
#if defined(TEST) || defined(INFO)
*logofs << "ProxyReadBuffer: Produced plain input for " << dataLength
<< "+" << trailerLength << "+" << controlLength << " bytes out of "
<< totalLength << " bytes.\n" << logofs_flush;
#endif
#ifdef DUMP
*logofs << "ProxyReadBuffer: Partial checksums are:\n";
DumpBlockChecksums(start, totalLength, 256);
*logofs << logofs_flush;
#endif
remaining_ = 0;
#ifdef TEST
*logofs << "ProxyReadBuffer: Located message with "
<< "remaining " << remaining_ << ".\n"
<< logofs_flush;
#endif
return 1;
}
}
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