// Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// Name        : SigComp.cpp

// Part of     : SigComp

// SigComp API frontend

// Version     : 1.0

//

// INCLUDE FILES

#include "Sigcomp.h"

#include "sigcompstateitem.h"

#include "Udvm.h"

#include "StateMgr.h"

#include "Compressor.h"

#include "MessageReader.h"

// ============================ MEMBER FUNCTIONS ==============================

CSigComp::CSigComp()

    {

    }

void CSigComp::ConstructL(TMemorySize aDecompressionMemSize,

                          TCyclesPerBit aCyclesPerBit,

                          TMemorySize aStateMemorySize,

                          TBool aUploadState)

    {

    if (aDecompressionMemSize == E0)

        {

        User::Leave(KErrArgument);

        }

    iMemSize = aDecompressionMemSize;

    iCyclesPerBit = aCyclesPerBit;

    iStateMemorySize = aStateMemorySize;

    iUploadState = aUploadState;

    iStateMgr = CStateMgr::NewL();

    }

void CSigComp::ConstructL(TMemorySize aDecompressionMemSize,

                          TCyclesPerBit aCyclesPerBit,

                          TMemorySize aStateMemorySize,

                          const TDesC8& aAlgorithm)

    {

    ConstructL(aDecompressionMemSize,

               aCyclesPerBit,

               aStateMemorySize,

               EFalse);

    iCompressor = CSigCompCompressor::NewL(aAlgorithm, iStateMgr);

    }

void CSigComp::ConstructL(TMemorySize aDecompressionMemSize,

                          TCyclesPerBit aCyclesPerBit,

                          TMemorySize aStateMemorySize,

                          const TDesC8& aAlgorithm,

                          const TSigCompStateItem& aStateItem,

                          TBool aUploadState)

    {

    ConstructL(aDecompressionMemSize,

               aCyclesPerBit,

               aStateMemorySize,

               aUploadState);

    RFs rfs;

    User::LeaveIfError(rfs.Connect());

    CleanupClosePushL(rfs);

#if !defined(__WINS__) && !defined(__WINSCW__)

    TParsePtrC parser(RProcess().FileName());

    User::LeaveIfError(rfs.SetSessionPath(parser.Drive()));

#endif    

    TInt stateLen = 0;

    RFile file;

    User::LeaveIfError(file.Open(rfs, aStateItem.iStateValue, EFileRead));

    CleanupClosePushL(file);

    file.Size(stateLen);

    HBufC8* valueBuf = HBufC8::NewL(stateLen);

    TPtr8 valueBufDes = valueBuf->Des();

    file.Read(valueBufDes, stateLen);

    CleanupStack::PopAndDestroy(2); // file, rfs

    CleanupStack::PushL(valueBuf);

    TStateItem* stateItem = iStateMgr->CreateStateL(NULL,

                                         (TInt16)stateLen,

                                         aStateItem.iStateAddress,

                                         aStateItem.iStateInstruction,

                                         aStateItem.iMinimumAccessLength,

                                         valueBuf->Ptr(), 0xffff);

    if (aStateItem.iStateIdentifier.Size() > 0)

        {

        if (aStateItem.iStateIdentifier.Compare(TPtrC8(

                                            stateItem->iStateIdentifier, 20)))

            {

            User::Leave(KErrNotFound);

            }

        }

    iCompressor = CSigCompCompressor::NewL(aAlgorithm,

                                             iStateMgr,

                                             stateItem,

                                             aStateItem.iStateLength,

                                             aUploadState);

    CleanupStack::PopAndDestroy(valueBuf);

    }

EXPORT_C CSigComp* CSigComp::NewL(TMemorySize aDecompressionMemSize,

                                  TCyclesPerBit aCyclesPerBit,

                                  TMemorySize aStateMemorySize,

                                  const TDesC8& aAlgorithm)

    {

    CSigComp* self = NewLC(aDecompressionMemSize,

                           aCyclesPerBit,

                           aStateMemorySize,

                           aAlgorithm);

    CleanupStack::Pop();

    return self;

    }

EXPORT_C CSigComp* CSigComp::NewL(TMemorySize aDecompressionMemSize,

                                  TCyclesPerBit aCyclesPerBit,

                                  TMemorySize aStateMemorySize,

                                  const TDesC8& aAlgorithm,

                                  const TSigCompStateItem& aStateItem,

                                  TBool aUploadState)

    {

    CSigComp* self = NewLC(aDecompressionMemSize,

                           aCyclesPerBit,

                           aStateMemorySize,

                           aAlgorithm,

                           aStateItem,

                           aUploadState);

    CleanupStack::Pop();

    return self;

    }

EXPORT_C CSigComp* CSigComp::NewLC(TMemorySize aDecompressionMemSize,

                                   TCyclesPerBit aCyclesPerBit,

                                   TMemorySize aStateMemorySize,

                                   const TDesC8& aAlgorithm)

    {

    CSigComp* self = new (ELeave)CSigComp;

    CleanupStack::PushL(self);

    self->ConstructL(aDecompressionMemSize,

                     aCyclesPerBit,

                     aStateMemorySize,

                     aAlgorithm);

    return self;

    }

EXPORT_C CSigComp* CSigComp::NewLC(TMemorySize aDecompressionMemSize,

                                   TCyclesPerBit aCyclesPerBit,

                                   TMemorySize aStateMemorySize,

                                   const TDesC8& aAlgorithm,

                                   const TSigCompStateItem& aStateItem,

                                   TBool aUploadState)

    {

    CSigComp* self = new (ELeave)CSigComp;

    CleanupStack::PushL(self);

    self->ConstructL(aDecompressionMemSize,

                     aCyclesPerBit,

                     aStateMemorySize,

                     aAlgorithm,

                     aStateItem,

                     aUploadState);

    return self;

    }

// Destructor

EXPORT_C CSigComp::~CSigComp()

    {

    delete iCompressor;

    delete iStateMgr;

    delete iUdvm;

    }

// ----------------------------------------------------------------------------

// CSigComp::DecompressL

// Decompress message

// ----------------------------------------------------------------------------

//

EXPORT_C CBufBase* CSigComp::DecompressL(const TDesC8& aMessage,

                                         TUint& aBytesConsumed,

                                         TBool aStreamBasedProtocol)

    {

    delete iUdvm;

    iUdvm = NULL;

    iUdvm = CUdvm::NewL(iStateMgr,

                        iMemSize,

                        iCyclesPerBit);

    return iUdvm->DecompressL(aMessage, aBytesConsumed, aStreamBasedProtocol);

    }

// ----------------------------------------------------------------------------

// CSigComp::AllowL

// Allow state create/free

// ----------------------------------------------------------------------------

//

EXPORT_C void CSigComp::AllowL(CSigCompCompartment& aSigCompCompartment)

    {

    if (iUdvm)

        {

        iUdvm->AllowStateOperationsL(&aSigCompCompartment);

        delete iUdvm;

        iUdvm = NULL;

        }

    }

// ----------------------------------------------------------------------------

// CSigComp::Deny

// Deny states

// ----------------------------------------------------------------------------

//

EXPORT_C void CSigComp::Deny()

    {

    if (iUdvm)

        {

        delete iUdvm;

        iUdvm = NULL;

        }

    }

// ----------------------------------------------------------------------------

// CSigComp::IsSigCompMsg

// Is SigComp message?

// ----------------------------------------------------------------------------

//

EXPORT_C TBool CSigComp::IsSigCompMsg(const TDesC8& aMessage) const

    {

    TInt pos = 0;

    // skip delimiters

    TBool skip = ETrue;

    while (skip)

        {

        if (pos < aMessage.Length())

            {

            if (aMessage[pos] == 0xff)

                {

                if ((pos+1) < aMessage.Length())

                    {

                    if (aMessage[pos+1] == 0xff)

                        {

                        pos += 2;

                        }

                    else

                        {

                        skip = EFalse;  // no more delimiters

                        }

                    }

                else

                    {

                    return EFalse;  // message too short

                    }

                }

            else

                {

                skip = EFalse;  // no more delimiters

                }

            }

        else

            {

                return EFalse;  // message too short

            }

        }

    //

    TUint byte;

    byte = aMessage[pos];

    // if byte == 0xff then quoted bytes, but byte is still 0xff

    return ((byte & KSigCompHeaderMask) == KSigCompHeaderMask);

    }

// ----------------------------------------------------------------------------

// CSigComp::IsCompleteL

// Is stream based message complete?

// ----------------------------------------------------------------------------

//

EXPORT_C TBool CSigComp::IsCompleteL(const TDesC8& aMessage) const

    {

    if (aMessage.Length() > 1)

        {

        CMessageReader* msgReader = new (ELeave)CMessageReader(aMessage, 

                                                               ETrue);

        CleanupStack::PushL(msgReader);

        msgReader->SkipDelimiters();

        TUint byte;

        TInt retval;

        while ((retval = msgReader->ReadByte(byte)) == KErrNone)

            {

            }

        if (retval == KErrEof)

            {

            CleanupStack::PopAndDestroy(msgReader);

            return ETrue;

            }

        else

            {

            CleanupStack::PopAndDestroy(msgReader);

            return EFalse;

            }

        }

    return EFalse;

    }

// ----------------------------------------------------------------------------

// CSigComp::DecompressionMemorySize

// get DMS

// ----------------------------------------------------------------------------

//

CSigComp::TMemorySize CSigComp::DecompressionMemorySize() const

    {

    return static_cast<CSigComp::TMemorySize>(iMemSize);

    };

// ----------------------------------------------------------------------------

// CSigComp::CyclesPerBit

// Get CPB

// ----------------------------------------------------------------------------

//

CSigComp::TCyclesPerBit CSigComp::CyclesPerBit() const

    {

    return iCyclesPerBit;

    };

// ----------------------------------------------------------------------------

// CSigComp::StateMemorySize

// Get SMS

// ----------------------------------------------------------------------------

//

CSigComp::TMemorySize CSigComp::StateMemorySize() const

    {

    return iStateMemorySize;

    };

// ----------------------------------------------------------------------------

// CSigComp::StateMgr

// Get state menager

// ----------------------------------------------------------------------------

//

const CStateMgr* CSigComp::StateMgr() const

    {

    return iStateMgr;

    }

// ----------------------------------------------------------------------------

// CSigComp::Compressor

// Get compressor

// ----------------------------------------------------------------------------

//

const CSigCompCompressor* CSigComp::Compressor() const

    {

    return iCompressor;

    }

// ----------------------------------------------------------------------------

// CSigComp::CyclesConsumed

// get consumed cycles number

// ----------------------------------------------------------------------------

//

#if defined(SIGCOMP_DEBUG)

EXPORT_C TUint CSigComp::CyclesConsumed() const

    {

    return iUdvm->CyclesConsumed();

    }

#endif