imgtools/imglib/e32image/deflate/compress.cpp
author lorewang
Wed, 01 Dec 2010 16:05:36 +0800
changeset 715 e0739b8406dd
parent 0 044383f39525
permissions -rw-r--r--
Specify extenal tool with path
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/*
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* Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: 
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* e32tools\petran\Szip\compress.cpp
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*
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*/
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#include "deflate.h"
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#if defined(__MSVCDOTNET__) || defined(__TOOLS2__)
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#include <fstream>
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#else //__MSVCDOTNET__
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#include <fstream.h>
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#endif //__MSVCDOTNET__
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#include <assert.h>
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#include "h_utl.h"
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class TFileOutput : public TBitOutput
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	{
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	enum {KBufSize=0x1000};
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public:
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	TFileOutput(ostream& os);
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	void FlushL();
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	TUint32 iDataCount; 
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private:
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	void OverflowL();
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private:
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	ostream& iOutStream;
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	TUint8 iBuf[KBufSize];
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	};
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TFileOutput::TFileOutput(ostream& os)
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	:iOutStream(os)
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	{
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	Set(iBuf,KBufSize);
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	}
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void TFileOutput::OverflowL()
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//
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// empty the buffer and reset the pointers
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//
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	{
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	FlushL();
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	Set(iBuf,KBufSize);
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	}
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void TFileOutput::FlushL()
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//
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// write out the contents of the buffer
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//
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	{
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	TInt len=Ptr()-iBuf;
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	if (len)
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		{
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		iOutStream.write(reinterpret_cast<char *>(iBuf), len); // write extended header
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		iDataCount += len;
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		}
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	}
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void DeflateCompress(char *bytes,TInt size,ostream &os)
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	{
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	TFileOutput* output=new TFileOutput(os);
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	output->iDataCount = 0;
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	DeflateL((TUint8*)bytes,size,*output);
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	output->FlushL();
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	delete output;
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	}
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TUint32 DeflateCompressCheck(char *bytes,TInt size,ostream &os)
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	{
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	TUint32 r = 0;
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	TFileOutput* output=new TFileOutput(os);
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	output->iDataCount = 0;
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	DeflateL((TUint8*)bytes,size,*output);
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	output->FlushL();
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	r = output->iDataCount; // Preserve the compressed count
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	delete output;
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	return r; // Return the compressed size
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	}
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class TFileInput : public TBitInput
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	{
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public:
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	TFileInput(unsigned char* source,int size);
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private:
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	void UnderflowL();
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private:
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	TUint8* iReadBuf;
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	TInt iSize;
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	};
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TFileInput::TFileInput(unsigned char* source,int size)
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	:iReadBuf(source),iSize(size)
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	{
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	Set(source,iSize*8);
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	}
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void TFileInput::UnderflowL()
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	{
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	Print(ESevereError,"Buffer underflow on deflate\n");
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	}
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void InflateUnCompress(unsigned char* source, int sourcesize,unsigned char* dest, int destsize)
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	{
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	TFileInput* input = new TFileInput(source, sourcesize);
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	CInflater* inflater=CInflater::NewLC(*input);
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	inflater->ReadL(dest,destsize);
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	delete inflater;
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	delete input;
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	}
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