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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 "Z.h"
#include "Misc.h"
#include "Control.h"
#include "EncodeBuffer.h"
#include "DecodeBuffer.h"
#include "StaticCompressor.h"
#define PANIC
#define WARNING
#undef TEST
#undef DEBUG
StaticCompressor::StaticCompressor(int compressionLevel,
int compressionThreshold)
{
buffer_ = NULL;
bufferSize_ = 0;
compressionStream_.zalloc = (alloc_func) 0;
compressionStream_.zfree = (free_func) 0;
compressionStream_.opaque = (voidpf) 0;
decompressionStream_.zalloc = (alloc_func) 0;
decompressionStream_.zfree = (free_func) 0;
decompressionStream_.opaque = (void *) 0;
decompressionStream_.next_in = (Bytef *) 0;
decompressionStream_.avail_in = 0;
#ifdef TEST
*logofs << "StaticCompressor: Compression level is "
<< compressionLevel << ".\n" << logofs_flush;
#endif
int result = deflateInit2(&compressionStream_, compressionLevel, Z_DEFLATED,
15, 9, Z_DEFAULT_STRATEGY);
if (result != Z_OK)
{
#ifdef PANIC
*logofs << "StaticCompressor: PANIC! Cannot initialize the "
<< "compression stream. Error is '" << zError(result)
<< "'.\n" << logofs_flush;
#endif
cerr << "Error" << ": Cannot initialize the compression "
<< "stream. Error is '" << zError(result) << "'.\n";
HandleAbort();
}
result = inflateInit2(&decompressionStream_, 15);
if (result != Z_OK)
{
#ifdef PANIC
*logofs << "StaticCompressor: PANIC! Cannot initialize the "
<< "decompression stream. Error is '" << zError(result)
<< "'.\n" << logofs_flush;
#endif
cerr << "Error" << ": Cannot initialize the decompression "
<< "stream. Error is '" << zError(result) << "'.\n";
HandleAbort();
}
#ifdef TEST
*logofs << "StaticCompressor: Compression threshold is "
<< compressionThreshold << ".\n" << logofs_flush;
#endif
threshold_ = compressionThreshold;
}
StaticCompressor::~StaticCompressor()
{
int result = deflateEnd(&compressionStream_);
if (result != Z_OK)
{
#ifdef PANIC
*logofs << "StaticCompressor: PANIC! Cannot deinitialize the "
<< "compression stream. Error is '" << zError(result)
<< "'.\n" << logofs_flush;
#endif
cerr << "Error" << ": Cannot deinitialize the compression "
<< "stream. Error is '" << zError(result) << "'.\n";
}
result = inflateEnd(&decompressionStream_);
if (result != Z_OK)
{
#ifdef PANIC
*logofs << "StaticCompressor: PANIC! Cannot deinitialize the "
<< "decompression stream. Error is '" << zError(result)
<< "'.\n" << logofs_flush;
#endif
cerr << "Error" << ": Cannot deinitialize the decompression "
<< "stream. Error is '" << zError(result) << "'.\n";
}
delete [] buffer_;
}
//
// This function compresses and encodes the compressed
// buffer. It returns a pointer to the internal buffer
// where data was compressed.
//
int StaticCompressor::compressBuffer(const unsigned char *plainBuffer,
const unsigned int plainSize,
unsigned char *&compressedBuffer,
unsigned int &compressedSize,
EncodeBuffer &encodeBuffer)
{
if (control -> LocalDataCompression == 0 ||
compressBuffer(plainBuffer, plainSize,
compressedBuffer, compressedSize) <= 0)
{
encodeBuffer.encodeBoolValue(0);
encodeBuffer.encodeMemory(plainBuffer, plainSize);
return 0;
}
else
{
encodeBuffer.encodeBoolValue(1);
encodeBuffer.encodeValue(compressedSize, 32, 14);
encodeBuffer.encodeValue(plainSize, 32, 14);
encodeBuffer.encodeMemory(compressedBuffer, compressedSize);
return 1;
}
}
//
// This function compresses data into a dynamically
// allocated buffer and returns a pointer to it, so
// application must copy data before the next call.
//
int StaticCompressor::compressBuffer(const unsigned char *plainBuffer,
const unsigned int plainSize,
unsigned char *&compressedBuffer,
unsigned int &compressedSize)
{
#ifdef DEBUG
*logofs << "StaticCompressor: Called for buffer at "
<< (void *) plainBuffer << ".\n"
<< logofs_flush;
#endif
compressedSize = plainSize;
if (plainSize < (unsigned int) threshold_)
{
#ifdef TEST
*logofs << "StaticCompressor: Leaving buffer unchanged. "
<< "Plain size is " << plainSize << " with threshold "
<< (unsigned int) threshold_ << ".\n" << logofs_flush;
#endif
return 0;
}
//
// Determine the size of the temporary
// buffer.
//
unsigned int newSize = plainSize + (plainSize / 1000) + 12;
//
// Allocate a new buffer if it grows
// beyond 64K.
//
if (buffer_ == NULL || (bufferSize_ > 65536 &&
newSize < bufferSize_ / 2) || newSize > bufferSize_)
{
delete [] buffer_;
buffer_ = new unsigned char[newSize];
if (buffer_ == NULL)
{
#ifdef PANIC
*logofs << "StaticCompressor: PANIC! Can't allocate compression "
<< "buffer of " << newSize << " bytes. Error is " << EGET()
<< " ' " << ESTR() << "'.\n" << logofs_flush;
#endif
cerr << "Warning" << ": Can't allocate compression buffer of "
<< newSize << " bytes. Error is " << EGET()
<< " '" << ESTR() << "'.\n";
bufferSize_ = 0;
return 0;
}
bufferSize_ = newSize;
}
unsigned int resultingSize = newSize;
int result = ZCompress(&compressionStream_, buffer_, &resultingSize,
plainBuffer, plainSize);
if (result == Z_OK)
{
if (resultingSize > newSize)
{
#ifdef PANIC
*logofs << "StaticCompressor: PANIC! Overflow in compression "
<< "buffer size. " << "Expected size was " << newSize
<< " while it is " << resultingSize << ".\n"
<< logofs_flush;
#endif
cerr << "Error" << ": Overflow in compress buffer size. "
<< "Expected size was " << newSize << " while it is "
<< resultingSize << ".\n";
return -1;
}
else if (resultingSize >= plainSize)
{
#ifdef TEST
*logofs << "StaticCompressor: Leaving buffer unchanged. "
<< "Plain size is " << plainSize << " compressed "
<< "size is " << resultingSize << ".\n"
<< logofs_flush;
#endif
return 0;
}
compressedBuffer = buffer_;
compressedSize = resultingSize;
#ifdef TEST
*logofs << "StaticCompressor: Compressed buffer from "
<< plainSize << " to " << resultingSize
<< " bytes.\n" << logofs_flush;
#endif
return 1;
}
#ifdef PANIC
*logofs << "StaticCompressor: PANIC! Failed compression of buffer. "
<< "Error is '" << zError(result) << "'.\n"
<< logofs_flush;
#endif
cerr << "Error" << ": Failed compression of buffer. "
<< "Error is '" << zError(result) << "'.\n";
return -1;
}
int StaticCompressor::decompressBuffer(unsigned char *plainBuffer,
unsigned int plainSize,
const unsigned char *&compressedBuffer,
unsigned int &compressedSize,
DecodeBuffer &decodeBuffer)
{
#ifdef DEBUG
*logofs << "StaticCompressor: Called for buffer at "
<< (void *) plainBuffer << ".\n"
<< logofs_flush;
#endif
unsigned int value;
decodeBuffer.decodeBoolValue(value);
if (value == 0)
{
memcpy(plainBuffer,
decodeBuffer.decodeMemory(plainSize),
plainSize);
return 0;
}
unsigned int checkSize = plainSize;
decodeBuffer.decodeValue(value, 32, 14);
compressedSize = value;
decodeBuffer.decodeValue(value, 32, 14);
checkSize = value;
//
// If caller needs the original compressed
// data it must copy this to its own buffer
// before using any further decode function.
//
compressedBuffer = decodeBuffer.decodeMemory(compressedSize);
int result = ZDecompress(&decompressionStream_, plainBuffer, &checkSize,
compressedBuffer, compressedSize);
if (result != Z_OK)
{
#ifdef PANIC
*logofs << "StaticCompressor: PANIC! Failure decompressing buffer. "
<< "Error is '" << zError(result) << "'.\n"
<< logofs_flush;
#endif
cerr << "Error" << ": Failure decompressing buffer. "
<< "Error is '" << zError(result) << "'.\n";
return -1;
}
else if (plainSize != checkSize)
{
#ifdef PANIC
*logofs << "StaticCompressor: PANIC! Expected decompressed size was "
<< plainSize << " while it is " << checkSize
<< ".\n" << logofs_flush;
#endif
cerr << "Error" << ": Expected decompressed size was "
<< plainSize << " while it is " << checkSize
<< ".\n";
return -1;
}
return 1;
}
//
// This is used to uncompress on-the-fly
// messages whose data has been stored
// in compressed format.
//
int StaticCompressor::decompressBuffer(unsigned char *plainBuffer,
const unsigned int plainSize,
const unsigned char *compressedBuffer,
const unsigned int compressedSize)
{
#ifdef TEST
*logofs << "StaticCompressor: Called for buffer at "
<< (void *) plainBuffer << ".\n"
<< logofs_flush;
#endif
unsigned int checkSize = plainSize;
int result = ZDecompress(&decompressionStream_, plainBuffer, &checkSize,
compressedBuffer, compressedSize);
if (result != Z_OK)
{
#ifdef PANIC
*logofs << "StaticCompressor: PANIC! Failure decompressing buffer. "
<< "Error is '" << zError(result) << "'.\n"
<< logofs_flush;
#endif
return -1;
}
if (plainSize != checkSize)
{
#ifdef PANIC
*logofs << "StaticCompressor: PANIC! Expected decompressed size was "
<< plainSize << " while it is " << checkSize
<< ".\n" << logofs_flush;
#endif
cerr << "Error" << ": Expected decompressed size was "
<< plainSize << " while it is " << checkSize
<< ".\n";
return -1;
}
#ifdef TEST
*logofs << "StaticCompressor: Decompressed buffer from "
<< compressedSize << " to " << plainSize
<< " bytes.\n" << logofs_flush;
#endif
return 1;
}