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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 <stddef.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "Misc.h"
#include "Control.h"
#include "WriteBuffer.h"
#define PANIC
#define WARNING
#undef TEST
#undef DEBUG
WriteBuffer::WriteBuffer()
{
size_ = WRITE_BUFFER_DEFAULT_SIZE;
buffer_ = new unsigned char[size_];
length_ = 0;
index_ = NULL;
scratchLength_ = 0;
scratchBuffer_ = NULL;
scratchOwner_ = 1;
initialSize_ = WRITE_BUFFER_DEFAULT_SIZE;
thresholdSize_ = WRITE_BUFFER_DEFAULT_SIZE << 1;
maximumSize_ = WRITE_BUFFER_DEFAULT_SIZE << 4;
#ifdef VALGRIND
memset(buffer_, '\0', size_);
#endif
}
WriteBuffer::~WriteBuffer()
{
if (scratchOwner_ == 1 &&
scratchBuffer_ != NULL)
{
delete [] scratchBuffer_;
}
delete [] buffer_;
}
void WriteBuffer::setSize(unsigned int initialSize, unsigned int thresholdSize,
unsigned int maximumSize)
{
initialSize_ = initialSize;
thresholdSize_ = thresholdSize;
maximumSize_ = maximumSize;
#ifdef TEST
*logofs << "WriteBuffer: Set buffer sizes to "
<< initialSize_ << "/" << thresholdSize_
<< "/" << maximumSize_ << ".\n"
<< logofs_flush;
#endif
}
void WriteBuffer::partialReset()
{
if (scratchBuffer_ != NULL)
{
if (scratchOwner_)
{
#ifdef DEBUG
*logofs << "WriteBuffer: Going to delete "
<< scratchLength_ << " bytes from the "
<< "scratch buffer.\n" << logofs_flush;
#endif
delete [] scratchBuffer_;
}
scratchLength_ = 0;
scratchBuffer_ = NULL;
scratchOwner_ = 1;
}
length_ = 0;
index_ = NULL;
#ifdef DEBUG
*logofs << "WriteBuffer: Performed partial reset with "
<< size_ << " bytes in buffer.\n"
<< logofs_flush;
#endif
}
void WriteBuffer::fullReset()
{
if (scratchBuffer_ != NULL)
{
if (scratchOwner_ == 1)
{
#ifdef DEBUG
*logofs << "WriteBuffer: Going to delete "
<< scratchLength_ << " bytes from the "
<< "scratch buffer.\n" << logofs_flush;
#endif
delete [] scratchBuffer_;
}
scratchLength_ = 0;
scratchBuffer_ = NULL;
scratchOwner_ = 1;
}
length_ = 0;
index_ = NULL;
if (size_ > initialSize_)
{
#ifdef TEST
*logofs << "WriteBuffer: Reallocating a new buffer of "
<< initialSize_ << " bytes.\n" << logofs_flush;
#endif
delete [] buffer_;
size_ = initialSize_;
buffer_ = new unsigned char[size_];
if (buffer_ == NULL)
{
#ifdef PANIC
*logofs << "WriteBuffer: PANIC! Can't allocate memory for "
<< "X messages in context [A].\n" << logofs_flush;
#endif
cerr << "Error" << ": Can't allocate memory for "
<< "X messages in context [A].\n";
HandleAbort();
}
#ifdef VALGRIND
memset(buffer_, '\0', size_);
#endif
}
#ifdef DEBUG
*logofs << "WriteBuffer: Performed full reset with "
<< size_ << " bytes in buffer.\n"
<< logofs_flush;
#endif
}
unsigned char *WriteBuffer::addMessage(unsigned int numBytes)
{
#ifdef DEBUG
*logofs << "WriteBuffer: Adding " << numBytes << " bytes to "
<< length_ << " bytes already in buffer.\n"
<< logofs_flush;
#endif
if (numBytes > WRITE_BUFFER_OVERFLOW_SIZE)
{
#ifdef PANIC
*logofs << "WriteBuffer: PANIC! Can't add a message of "
<< numBytes << " bytes.\n" << logofs_flush;
*logofs << "WriteBuffer: PANIC! Assuming error handling "
<< "data in context [B].\n" << logofs_flush;
#endif
cerr << "Error" << ": Can't add a message of "
<< numBytes << " bytes to write buffer.\n";
cerr << "Error" << ": Assuming error handling "
<< "data in context [B].\n";
HandleAbort();
}
else if (length_ + numBytes > size_)
{
unsigned int newSize = thresholdSize_;
while (newSize < length_ + numBytes)
{
newSize <<= 1;
if (newSize > maximumSize_)
{
newSize = length_ + numBytes + initialSize_;
}
}
#ifdef TEST
*logofs << "WriteBuffer: Growing buffer from "
<< size_ << " to " << newSize << " bytes.\n"
<< logofs_flush;
#endif
unsigned int indexOffset = 0;
if (index_ && *index_)
{
indexOffset = *index_ - buffer_;
}
size_ = newSize;
unsigned char *newBuffer = new unsigned char[size_];
if (newBuffer == NULL)
{
#ifdef PANIC
*logofs << "WriteBuffer: PANIC! Can't allocate memory for "
<< "X messages in context [C].\n" << logofs_flush;
#endif
cerr << "Error" << ": Can't allocate memory for "
<< "X messages in context [C].\n";
HandleAbort();
}
#ifdef TEST
if (newSize >= maximumSize_)
{
*logofs << "WriteBuffer: WARNING! Buffer grown to reach "
<< "size of " << newSize << " bytes.\n"
<< logofs_flush;
}
#endif
#ifdef VALGRIND
memset(newBuffer, '\0', size_);
#endif
memcpy(newBuffer, buffer_, length_);
#ifdef DEBUG
*logofs << "WriteBuffer: Going to delete the "
<< "old buffer with new size " << size_
<< ".\n" << logofs_flush;
#endif
delete [] buffer_;
buffer_ = newBuffer;
if (index_ && *index_)
{
*index_ = buffer_ + indexOffset;
}
}
unsigned char *result = buffer_ + length_;
length_ += numBytes;
#ifdef DEBUG
*logofs << "WriteBuffer: Bytes in buffer are "
<< length_ << " while size is " << size_
<< ".\n" << logofs_flush;
#endif
return result;
}
unsigned char *WriteBuffer::removeMessage(unsigned int numBytes)
{
#ifdef TEST
*logofs << "WriteBuffer: Removing " << numBytes
<< " bytes from buffer.\n" << logofs_flush;
#endif
if (numBytes > length_)
{
#ifdef PANIC
*logofs << "WriteBuffer: PANIC! Can't remove "
<< numBytes << " bytes with only " << length_
<< " bytes in buffer.\n" << logofs_flush;
#endif
cerr << "Error" << ": Buffer underflow handling "
<< "write buffer in context [D].\n";
HandleAbort();
}
length_ -= numBytes;
#ifdef TEST
*logofs << "WriteBuffer: Bytes in buffer are now "
<< length_ << " while size is "
<< size_ << ".\n" << logofs_flush;
#endif
return (buffer_ + length_);
}
unsigned char *WriteBuffer::addScratchMessage(unsigned int numBytes)
{
if (numBytes > WRITE_BUFFER_OVERFLOW_SIZE)
{
#ifdef PANIC
*logofs << "WriteBuffer: PANIC! Can't add a message of "
<< numBytes << " bytes.\n" << logofs_flush;
*logofs << "WriteBuffer: PANIC! Assuming error handling "
<< "data in context [E].\n" << logofs_flush;
#endif
cerr << "Error" << ": Can't add a message of "
<< numBytes << " bytes to write buffer.\n";
cerr << "Error" << ": Assuming error handling "
<< "data in context [E].\n";
HandleAbort();
}
else if (scratchBuffer_ != NULL)
{
#ifdef PANIC
*logofs << "WriteBuffer: PANIC! Can't add a message of "
<< numBytes << " bytes with " << scratchLength_
<< " bytes already in scratch buffer.\n"
<< logofs_flush;
*logofs << "WriteBuffer: PANIC! Assuming error handling "
<< "data in context [F].\n" << logofs_flush;
#endif
cerr << "Error" << ": Can't add a message of "
<< numBytes << " bytes with " << scratchLength_
<< " bytes already in scratch buffer.\n";
cerr << "Error" << ": Assuming error handling "
<< "data in context [F].\n";
HandleAbort();
}
#ifdef DEBUG
*logofs << "WriteBuffer: Adding " << numBytes << " bytes "
<< "to scratch buffer.\n" << logofs_flush;
#endif
unsigned char *newBuffer = new unsigned char[numBytes];
if (newBuffer == NULL)
{
#ifdef PANIC
*logofs << "WriteBuffer: PANIC! Can't allocate memory for "
<< "X messages in context [G].\n" << logofs_flush;
#endif
cerr << "Error" << ": Can't allocate memory for "
<< "X messages in context [G].\n";
HandleAbort();
}
#ifdef VALGRIND
memset(newBuffer, '\0', numBytes);
#endif
scratchBuffer_ = newBuffer;
scratchOwner_ = 1;
scratchLength_ = numBytes;
return newBuffer;
}
unsigned char *WriteBuffer::addScratchMessage(unsigned char *newBuffer, unsigned int numBytes)
{
if (numBytes > WRITE_BUFFER_OVERFLOW_SIZE)
{
#ifdef PANIC
*logofs << "WriteBuffer: PANIC! Can't add a message of "
<< numBytes << " bytes.\n" << logofs_flush;
*logofs << "WriteBuffer: PANIC! Assuming error handling "
<< "data in context [H].\n" << logofs_flush;
#endif
cerr << "Error" << ": Can't add a message of "
<< numBytes << " bytes to write buffer.\n";
cerr << "Error" << ": Assuming error handling "
<< "data in context [H].\n";
HandleAbort();
}
else if (scratchBuffer_ != NULL)
{
#ifdef PANIC
*logofs << "WriteBuffer: PANIC! Can't add a foreign "
<< "message of " << numBytes << " bytes with "
<< scratchLength_ << " bytes already in "
<< "scratch buffer.\n" << logofs_flush;
*logofs << "WriteBuffer: PANIC! Assuming error handling "
<< "data in context [I].\n" << logofs_flush;
#endif
cerr << "Error" << ": Can't add a foreign message of "
<< numBytes << " bytes with " << scratchLength_
<< " bytes already in scratch buffer.\n";
cerr << "Error" << ": Assuming error handling "
<< "data in context [I].\n";
HandleAbort();
}
#ifdef DEBUG
*logofs << "WriteBuffer: Adding " << numBytes << " bytes "
<< "from a foreign message to scratch buffer.\n"
<< logofs_flush;
#endif
scratchBuffer_ = newBuffer;
scratchLength_ = numBytes;
scratchOwner_ = 0;
return newBuffer;
}
void WriteBuffer::removeScratchMessage()
{
#ifdef TEST
if (scratchLength_ == 0 || scratchBuffer_ == NULL)
{
#ifdef PANIC
*logofs << "WriteBuffer: PANIC! Can't remove non existent scratch message.\n"
<< logofs_flush;
#endif
cerr << "Error" << ": Can't remove non existent scratch message.\n";
HandleAbort();
}
*logofs << "WriteBuffer: Removing " << scratchLength_
<< " bytes from scratch buffer.\n"
<< logofs_flush;
#endif
if (scratchOwner_ == 1)
{
#ifdef DEBUG
*logofs << "WriteBuffer: Going to delete "
<< scratchLength_ << " bytes from the "
<< "scratch buffer.\n" << logofs_flush;
#endif
delete [] scratchBuffer_;
}
scratchLength_ = 0;
scratchBuffer_ = NULL;
scratchOwner_ = 1;
}
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