sl@0: // Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: //
sl@0: 
sl@0: #include "OldEZDecompressor.h"
sl@0: 
sl@0: using namespace TOLDEZLIB;
sl@0: 
sl@0: CEZDecompressor::~CEZDecompressor()
sl@0: 	{
sl@0: 
sl@0: 	// Note inflateEnd may already have been called by zlib if an error occured during inflation.
sl@0: 	// However nothing bad will happen if it gets called twice.
sl@0: 
sl@0: 	inflateEnd(&iStream);
sl@0: 	}
sl@0: 
sl@0: CEZDecompressor::CEZDecompressor(MEZBufferManager* aInit,const TUint8 *aDictionary, TInt aLength) : 
sl@0: 		iBufferInit(aInit), iDictionary(aDictionary), iDictionaryLength(aLength)
sl@0: 	{
sl@0: 	
sl@0: 	}
sl@0: 
sl@0: CEZDecompressor::CEZDecompressor(MEZBufferManager* aInit) : 
sl@0: 		iBufferInit(aInit), iDictionary(NULL), iDictionaryLength(-1)
sl@0: 	{
sl@0: 	
sl@0: 	}
sl@0: 
sl@0: 
sl@0: void CEZDecompressor::ConstructL(TInt aWindowBits)
sl@0: 	{
sl@0: 	iStream.zalloc = Z_NULL;
sl@0: 	iStream.zfree = Z_NULL;
sl@0: 	iStream.opaque = Z_NULL;
sl@0: 
sl@0: 	iBufferInit->InitializeL(*this);
sl@0: 
sl@0: 	TInt err = inflateInit2(&iStream,aWindowBits);
sl@0: 	if (err == Z_VERSION_ERROR)
sl@0: 		User::Leave(KEZlibErrVersion);
sl@0: 	else if (err == Z_MEM_ERROR)
sl@0: 		User::LeaveNoMemory();
sl@0: 
sl@0: 	iInflationState = ENoFlush;
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Creates a new CEZDecompressor object and leaves it on the CleanupStack
sl@0: 
sl@0: @param aInit buffer manager to handle both input and output buffers
sl@0: @param aWindowBits the base two logarithm of the window size (the size of the history buffer).  It should 
sl@0: be in the range 8..15 for this version of the library. Larger values of this parameter result in better 
sl@0: compression at the expense of memory usage.
sl@0: @return the new CEZDecompressor object (on the CleanupStack)
sl@0: */
sl@0: EXPORT_C CEZDecompressor*  CEZDecompressor::NewLC(MEZBufferManager& aInit, TInt aWindowBits)
sl@0: 	{
sl@0: 	CEZDecompressor *inf = new (ELeave) CEZDecompressor(&aInit);
sl@0: 	CleanupStack::PushL(inf);
sl@0: 	inf->ConstructL(aWindowBits);
sl@0: 	return inf;
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Creates a new CEZDecompressor object
sl@0: 
sl@0: @param aInit buffer manager to handle both input and output buffers
sl@0: @param aWindowBits the base two logarithm of the window size (the size of the history buffer).  It should 
sl@0: be in the range 8..15 for this version of the library. Larger values of this parameter result in better 
sl@0: compression at the expense of memory usage.
sl@0: @return the new CEZDecompressor object
sl@0: */
sl@0: EXPORT_C CEZDecompressor* CEZDecompressor::NewL(MEZBufferManager& aInit, TInt aWindowBits)
sl@0: 	{
sl@0: 	CEZDecompressor *inf = new (ELeave) CEZDecompressor(&aInit);
sl@0: 	CleanupStack::PushL(inf);
sl@0: 	inf->ConstructL(aWindowBits);
sl@0: 	CleanupStack::Pop();
sl@0: 	return inf;
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Overload of CEZDecompressor constructor takes aDictionary argument
sl@0: 
sl@0: @param aInit buffer manager to handle both input and output buffers
sl@0: @param aDictionary used to initialize the de-compression dictionary from the given byte sequence.  The compressor and 
sl@0: decompressor must use exactly the same dictionary.
sl@0: @param aWindowBits the base two logarithm of the window size (the size of the history buffer).  It should 
sl@0: be in the range 8..15 for this version of the library. Larger values of this parameter result in better 
sl@0: compression at the expense of memory usage.
sl@0: @return the new CEZDecompressor object (on the CleanupStack)
sl@0: */
sl@0: EXPORT_C CEZDecompressor* CEZDecompressor::NewLC(MEZBufferManager& aInit, const TDesC8& aDictionary, TInt aWindowBits)
sl@0: 	{
sl@0: 	CEZDecompressor *inf = new (ELeave) CEZDecompressor(&aInit,aDictionary.Ptr(),aDictionary.Size());
sl@0: 	CleanupStack::PushL(inf);
sl@0: 	inf->ConstructL(aWindowBits);
sl@0: 	return inf;
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Overload of CEZDecompressor constructor takes aDictionary argument
sl@0: 
sl@0: @param aInit buffer manager to handle both input and output buffers
sl@0: @param aDictionary used to initialize the de-compression dictionary from the given byte sequence.  The compressor and 
sl@0: decompressor must use exactly the same dictionary.
sl@0: @param aWindowBits the base two logarithm of the window size (the size of the history buffer).  It should 
sl@0: be in the range 8..15 for this version of the library. Larger values of this parameter result in better 
sl@0: compression at the expense of memory usage.
sl@0: @return the new CEZDecompressor object
sl@0: */
sl@0: EXPORT_C CEZDecompressor* CEZDecompressor::NewL(MEZBufferManager& aInit, const TDesC8& aDictionary, TInt aWindowBits)
sl@0: 	{
sl@0: 	CEZDecompressor *inf = new (ELeave) CEZDecompressor(&aInit,aDictionary.Ptr(),aDictionary.Size());
sl@0: 	CleanupStack::PushL(inf);
sl@0: 	inf->ConstructL(aWindowBits);
sl@0: 	CleanupStack::Pop();
sl@0: 	return inf;
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Resets the current de-compression operation, with the new buffer manager
sl@0: 
sl@0: @param aInit new buffer manager to handle the new input and output buffers
sl@0: @leave KEZlibErrStream There is a problem with the stream
sl@0: @leave ... Any of the System wide error codes
sl@0: */
sl@0: EXPORT_C void CEZDecompressor::ResetL(MEZBufferManager& aInit)
sl@0: 	{
sl@0: 	iBufferInit = &aInit;
sl@0: 	iBufferInit->InitializeL(*this);
sl@0: 	if (inflateReset(&iStream) == Z_STREAM_ERROR)
sl@0: 		User::Leave(KEZlibErrStream);
sl@0: 	iInflationState = ENoFlush;	
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: De-compress the data to the buffer in stages, return value indicates if the de-compression has finalised 
sl@0: or if further calls are necessary
sl@0: 
sl@0: @leave KEZlibErrStream There is a problem with the stream
sl@0: @leave KEZlibErrBuf There is a problem with the buffer
sl@0: @leave KEZlibErrData There is a problem with the data
sl@0: @leave KEZlibErrUnexpected Unexpected programming error
sl@0: @leave ... Any of the System wide error codes
sl@0: @return ETrue if the function must be called again, EFalse if compression is finalised
sl@0: */
sl@0: EXPORT_C TBool CEZDecompressor::InflateL()
sl@0: 	{
sl@0: 	TInt err;
sl@0: 	TBool callAgain = ETrue;
sl@0: 
sl@0: 	switch (iInflationState)
sl@0: 		{
sl@0: 	case ENoFlush:
sl@0: 		err = inflate(&iStream,Z_NO_FLUSH);
sl@0: 		
sl@0: 		switch (err)
sl@0: 			{
sl@0: 		case Z_STREAM_ERROR:			
sl@0: 			User::Leave(KEZlibErrStream);
sl@0: 
sl@0: 			break;
sl@0: 
sl@0: 		case Z_OK:
sl@0: 			if (iStream.avail_in == 0)
sl@0: 				iBufferInit->NeedInputL(*this);
sl@0: 				
sl@0: 			if (iStream.avail_out == 0)
sl@0: 				iBufferInit->NeedOutputL(*this);
sl@0: 			break;
sl@0: 
sl@0: 		case Z_BUF_ERROR:  			
sl@0: 			User::Leave(KEZlibErrBuf);
sl@0: 			break;
sl@0: 
sl@0: 		case Z_NEED_DICT:
sl@0: 			SetDictionaryL();
sl@0: 			break;
sl@0: 
sl@0: 		case Z_STREAM_END:
sl@0: 			iInflationState = EFinalize;
sl@0: 			break;
sl@0: 
sl@0: 		case Z_MEM_ERROR:
sl@0: 			User::LeaveNoMemory();
sl@0: 			break;
sl@0: 		
sl@0: 		case Z_DATA_ERROR:
sl@0: 			User::Leave(KEZlibErrData);
sl@0: 			break;
sl@0: 
sl@0: 		default:
sl@0: 			
sl@0: 			// there's something wrong with this code if we get here !
sl@0: 
sl@0: 			User::Leave(KEZlibErrUnexpected);
sl@0: 			break;
sl@0: 		}
sl@0: 		break;
sl@0: 	
sl@0: 	case EFinalize:
sl@0: 		iBufferInit->FinalizeL(*this);
sl@0: 		callAgain = EFalse;
sl@0: 		iInflationState = ETerminated;
sl@0: 		break;
sl@0: 
sl@0: 	case ETerminated:		
sl@0: 		User::Leave(KEZlibErrInflateTerminated);
sl@0: 		}
sl@0: 
sl@0: 	return callAgain;
sl@0: 	}
sl@0: 
sl@0: void CEZDecompressor::SetDictionaryL()
sl@0: 	{
sl@0: 	if(!iDictionary  || iDictionaryLength < 0)
sl@0: 		{
sl@0: 		User::Leave(KEZlibErrData);
sl@0: 		}
sl@0: 
sl@0: 	TInt err = inflateSetDictionary(&iStream,STATIC_CAST(const Bytef*,iDictionary),iDictionaryLength);
sl@0: 
sl@0: 	if (err == Z_DATA_ERROR)
sl@0: 		User::Leave(KEZlibErrInflateDictionary);
sl@0: 	else if (err == Z_STREAM_ERROR)
sl@0: 		User::Leave(KEZlibErrInflateDictionary);
sl@0: 
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: De-compresses the data in the given buffer
sl@0: 
sl@0: @param aDestination the target buffer for the de-compressed data
sl@0: @param aSource the buffer containing the compressed data
sl@0: @leave KEZLibErrBuf There is a problem with the buffer
sl@0: @leave KEZLIbErrData There is a problem with the data
sl@0: @leave ... Any of the system wide error codes
sl@0: */
sl@0: EXPORT_C void CEZDecompressor::DecompressL(TDes8 &aDestination, const TDesC8 &aSource)
sl@0: 	{
sl@0: 	uLongf dl = aDestination.MaxSize();
sl@0: 	Bytef *destinationBuffer = STATIC_CAST(Bytef* , CONST_CAST(TUint8* ,aDestination.Ptr()));
sl@0: 	const Bytef* sourceBuffer = STATIC_CAST(const Bytef* ,aSource.Ptr());
sl@0: 	TInt err = uncompress(destinationBuffer,&dl,sourceBuffer,aSource.Size());
sl@0: 
sl@0: 	if (err == Z_MEM_ERROR) 
sl@0: 		User::LeaveNoMemory();
sl@0: 	else if (err == Z_BUF_ERROR)
sl@0: 		User::Leave(KEZlibErrBuf);
sl@0: 	else if (err == Z_DATA_ERROR)
sl@0: 		User::Leave(KEZlibErrData);
sl@0: 
sl@0: 	aDestination.SetLength(dl);
sl@0: 	}