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// ****************************************************************************
// Project: GUYMAGER
// ****************************************************************************
// Programmer: Guy Voncken
// Police Grand-Ducale
// Service de Police Judiciaire
// Section Nouvelles Technologies
// ****************************************************************************
// Module: Multi-threaded compression
// ****************************************************************************
#include <QtCore>
#include "libewf.h"
#include "common.h"
#include "device.h"
#include "threadcompress.h"
#include "threadwrite.h"
#include "config.h"
#include "aaff.h"
class t_ThreadCompressLocal
{
public:
t_pDevice pDevice;
int ThreadNr;
};
t_ThreadCompress::t_ThreadCompress (void)
{
CHK_EXIT (ERROR_THREADCOMPRESS_CONSTRUCTOR_NOT_SUPPORTED)
} //lint !e1401 not initialised
t_ThreadCompress::t_ThreadCompress (t_pDevice pDevice, int ThreadNr)
{
static bool Initialised = false;
if (!Initialised)
{
CHK_EXIT (TOOL_ERROR_REGISTER_CODE (ERROR_THREADCOMPRESS_CONSTRUCTOR_NOT_SUPPORTED))
CHK_EXIT (TOOL_ERROR_REGISTER_CODE (ERROR_THREADCOMPRESS_ZLIB_FAILED))
CHK_EXIT (TOOL_ERROR_REGISTER_CODE (ERROR_THREADCOMPRESS_LIBEWF_FAILED))
CHK_EXIT (TOOL_ERROR_REGISTER_CODE (ERROR_THREADCOMPRESS_COMPRESSION_BUFFER_TOO_SMALL))
CHK_EXIT (TOOL_ERROR_REGISTER_CODE (ERROR_THREADCOMPRESS_INVALID_FORMAT))
Initialised = true;
}
pOwn = new t_ThreadCompressLocal;
pOwn->pDevice = pDevice;
pOwn->ThreadNr = ThreadNr;
CHK_QT_EXIT (connect (this, SIGNAL(finished()), this, SLOT(SlotFinished())))
}
t_ThreadCompress::~t_ThreadCompress (void)
{
delete pOwn;
}
void t_ThreadCompress::run (void)
{
t_pDevice pDevice;
t_pFifoStd pFifoIn;
t_pFifoStd pFifoOut;
t_pFifoBlock pFifoBlockIn;
t_pFifoBlock pFifoBlockOut;
bool Finished = false;
quint64 Blocks = 0;
const int SubFifoNr = pOwn->ThreadNr;
size_t CompressedMaxSize = 0;
size_t CompressedSize = 0;
LIBEWF_HANDLE *pEwfHandle;
ssize_t rc;
LOG_INFO ("Acquisition of %s: Compression thread #%d started", QSTR_TO_PSZ (pOwn->pDevice->LinuxDevice), pOwn->ThreadNr)
pDevice = pOwn->pDevice;
if (pDevice->Acquisition.Format == t_File::EWF)
{
CompressedMaxSize = (size_t) (pDevice->FifoBlockSize *1.001) + 12; // see zlib documentation
if (CompressedMaxSize > t_Fifo::GetCompressionOptimisedBufferSize (pDevice->FifoBlockSize))
CHK_EXIT (ERROR_THREADCOMPRESS_COMPRESSION_BUFFER_TOO_SMALL)
}
CHK_EXIT (pDevice->pThreadWrite->GetpFileHandle ((void **)&pEwfHandle))
CHK_EXIT (pDevice->pFifoCompressIn ->GetSubFifo (SubFifoNr, pFifoIn ))
CHK_EXIT (pDevice->pFifoCompressOut->GetSubFifo (SubFifoNr, pFifoOut))
while (!Finished && !pDevice->AbortRequest)
{
CHK_EXIT (pFifoIn->Get (pFifoBlockIn))
if (pFifoBlockIn)
{
Blocks++;
switch (pDevice->Acquisition.Format)
{
case t_File::EWF:
CHK_EXIT (t_Fifo::CreateCompressionOptimised (pFifoBlockOut, pDevice->FifoBlockSize))
CompressedSize = CompressedMaxSize; // Must be initialised with the max buffer size (we use this one instead of MULTITHREADED_COMPRESSION_FIFO_BLOCK_SIZE in order to check if ti works as tols in the zlib docu)
pFifoBlockOut->Nr = pFifoBlockIn->Nr;
pFifoBlockOut->DataSize = pFifoBlockIn->DataSize;
rc = libewf_raw_write_prepare_buffer (pEwfHandle, pFifoBlockIn ->Buffer, pFifoBlockIn->DataSize,
pFifoBlockOut->Buffer, &CompressedSize,
&pFifoBlockOut->EwfCompressionUsed,
&pFifoBlockOut->EwfChunkCRC,
&pFifoBlockOut->EwfWriteCRC);
if (pFifoBlockOut->EwfCompressionUsed)
{
pFifoBlockOut->EwfDataSize = CompressedSize; // Data to be forwarded is contained in
CHK_EXIT (t_Fifo::Destroy (pFifoBlockIn)) // pFifoBlockOut, pFifoBlockIn no longer needed.
}
else
{
pFifoBlockIn->EwfDataSize = pFifoBlockIn ->DataSize;
pFifoBlockIn->EwfCompressionUsed = pFifoBlockOut->EwfCompressionUsed;
pFifoBlockIn->EwfChunkCRC = pFifoBlockOut->EwfChunkCRC;
pFifoBlockIn->EwfWriteCRC = pFifoBlockOut->EwfWriteCRC;
CHK_EXIT (t_Fifo::Destroy (pFifoBlockOut)) // No compression, we'll forward the
pFifoBlockOut = pFifoBlockIn; // original block we received
}
if (rc != (ssize_t) pFifoBlockOut->EwfDataSize)
{
LOG_INFO ("libewf_raw_write_prepare_buffer returned %d. DataSize=%u, CompressedMaxSize=%zd, CompressedSize=%zd, EwfCompressionUsed=%d", (int)rc,
pFifoBlockOut->DataSize, CompressedMaxSize, CompressedSize, pFifoBlockOut->EwfCompressionUsed)
CHK_EXIT (ERROR_THREADCOMPRESS_LIBEWF_FAILED)
}
pFifoBlockOut->EwfPreprocessed = true;
break;
case t_File::AFF:
// LOG_ERROR ("AaffPreprocess")
CHK_EXIT (t_Fifo::CreateCompressionOptimised (pFifoBlockOut, pDevice->FifoBlockSize))
pFifoBlockOut->Nr = pFifoBlockIn->Nr;
pFifoBlockOut->DataSize = pFifoBlockIn->DataSize;
CHK_EXIT (AaffPreprocess (&pFifoBlockOut->pAaffPreprocess, pFifoBlockIn->Buffer, pFifoBlockIn->DataSize, pFifoBlockOut->Buffer, pFifoBlockOut->BufferSize))
if (pFifoBlockOut->pAaffPreprocess->Compressed)
{
CHK_EXIT (t_Fifo::Destroy (pFifoBlockIn))
}
else
{
pFifoBlockIn->pAaffPreprocess = pFifoBlockOut->pAaffPreprocess;
CHK_EXIT (t_Fifo::Destroy (pFifoBlockOut))
pFifoBlockOut = pFifoBlockIn;
}
break;
default:
CHK_EXIT (ERROR_THREADCOMPRESS_INVALID_FORMAT)
}
CHK_EXIT (pFifoOut->Insert (pFifoBlockOut))
}
else
{
LOG_INFO ("Dummy block")
Finished = true;
}
}
LOG_INFO ("Compression thread #%d exits now (device %s, %Ld blocks processed)", pOwn->ThreadNr, QSTR_TO_PSZ (pOwn->pDevice->LinuxDevice), Blocks)
}
void t_ThreadCompress::SlotFinished (void)
{
emit SignalEnded (pOwn->pDevice, pOwn->ThreadNr);
}
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