secureswitools/swisistools/source/rscparser/barscimpl.h
author hgs
Fri, 06 Aug 2010 10:59:22 +0300
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permissions -rw-r--r--
201031_01
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// Copyright (c) 2009 - 2010 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 "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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//
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/** 
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* @file barscimpl.h
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*
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* @internalComponent
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* @released
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*/
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#ifndef __BARSCIMPL_H__
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#define __BARSCIMPL_H__
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#include <string>
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#include "commontypes.h"
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//Forward declarations
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struct SDictionaryCompressionData;
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class RDictionaryCompressionBitStream;
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/** 
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Accesses a resource file and reads the resource data into a buffer.
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It is the implementation class for CResourceFile class.
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*/
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class RResourceFileImpl
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	{
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public:
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	RResourceFileImpl();
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	~RResourceFileImpl();
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	/** 
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	Opens the resource file reader.
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	The resource file reader must be opened before reading resources.
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	@param aName name of the RSC file.
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	@param aFileOffset RSC file offset 
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	@param aFileSize RSC file size
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	*/
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	void OpenL(const std::string& aName, TUint32 aFileOffset=0, TInt aFileSize=0);
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	/** 
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	Reads a resource after allocating heap memory for it.
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	Ownership of the allocated heap is passes to the caller who must 
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	free it.	
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	@param aResourceId The numeric id of the resource to be read.
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	@return Pointer to the heap containing the resource.
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	*/
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	Ptr8* AllocReadL(const TInt& aResourceId);
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	/** Initialises the offset value from the first resource.
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	The function tests to catch cases where the first resource is not an RSS_SIGNATURE.
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	It assumes that the first resource in the file consists of
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	two 32-bit integers. The first integer contains the version number and
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	the second is a self-referencing link whose value is the offset for
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	the resources in the file, plus 1.This function must be called before
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	calling Offset(), AllocReadL(), AllocReadLC() or ReadL().
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	*/
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	void ConfirmSignatureL();
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	/** 
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	Tests whether the resource file owns the specified resource id.
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	@param aResourceId The resource id to test.
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	@return True, if the resource file owns the id, false otherwise.
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	*/
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	TBool OwnsResourceId(const TInt& aResourceId) const;
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	/** 
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	Function to read specified bytes from the RSC file
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	@param aPos Offset from where to begin reading
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	@param aData Buffer to store read values
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	@param aLength Length of the bytes to be read.
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	@return Length of the bytes to be read.
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	*/
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	TInt ReadL(TInt aPos,TUint8* aData,const TInt& aLength);
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	TUidType UidType() const;
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private:
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	struct SSigRecord
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		{
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		TInt signature;
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		TInt offset;
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		};
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  enum
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		{
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		EFlagIsRomFile																=0x80000000,
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		EFlagPotentiallyContainsCompressedUnicode									=0x40000000,
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		EFlagDictionaryCompressed													=0x20000000,
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		EFlagThirdUidIsOffset														=0x10000000,
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		EFlagGenerate_RSS_SIGNATURE_ForFirstUserResource							=0x08000000,
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		EFlagFirstResourceIsGeneratedBitArrayOfResourcesContainingCompressedUnicode	=0x04000000,
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		EFlagCalypsoFileFormat														=0x02000000,
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		EFlagIsBufferRscFile														=0x01000000,
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		EAllFlags																	=0xff000000
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		};
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	enum
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		{
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		EOffsetBits	=0xfffff000,
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		EIdBits		=0x00000fff
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		};
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   112
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	class TExtra;
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   114
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   115
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private:	
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	/** 
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	Function to read specified bytes from the RSC file
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	@param aFlags Integer conatainig no of resource and status flags.
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	@param aPos Offset from where to begin reading
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	@param aData Buffer to store read values
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	@param aLength Length of the bytes to be read.
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	@return Length of the bytes to be read.
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	*/
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	TInt ReadL(const TUint32& aFlags, TInt aPos, TUint8* aData, const TInt& aLength);
25
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   126
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	/** @internalComponent
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	@return The first resource record.
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	@panic Some BAFL panic codes, if the file is corrupted.
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	@leave KErrCorrupt The file is corrupted.
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	Some other error codes are possible too.
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   132
	The method could panic or leave depending on the state of
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	iAssertObj member of RResourceFileImpl::TExtra class. */
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   134
	SSigRecord FirstRecordL() const;
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   135
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   136
	
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	/** 
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	Function to retrieve the header and 
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	resource index information of the RSC file.
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	*/
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	void ReadHeaderAndResourceIndexL();
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	/** 
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	The method will decomress the unicode data (aCompressedUnicode argument) and append
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	the decompressed data to the end of aBuffer (aBuffer argument).
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   146
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	@param aBuffer Destination buffer.
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	@param aCompressedUnicode Pointer to compressed unicode data.
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	@param aLengthOfCompressedUnicode Length of compressed unicode data.
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	*/
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	void AppendDecompressedUnicodeL(
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								Ptr8* aBuffer,
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								const TUint8*  aCompressedUnicode,
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								const TInt& aLengthOfCompressedUnicode) const;
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	/** 
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	The method will decompress the unicode data (aInputResourceData argument), allocate enough
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	memory from the heap for the decompressed data, copy the data there and return a pointer
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	to the decompressed data.
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	The method doesn't own the allocated heap memory for the decompressed data. It's a caller
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	responsibility to deallocate the allocated memory.
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	@param aInputResourceData Compressed data.
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	@return Pointer to decompressed data 
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	*/
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	Ptr8* DecompressUnicodeL(const Ptr8* aInputResourceData) const;
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   165
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   166
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	/**
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	The method will decompress the dictionary compressed data, allocate enough
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   169
	memory from the heap for the decompressed data, copy the data there and return a pointer
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	to the decompressed data.
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	The method doesn't own the allocated heap memory for the decompressed data. It's a caller
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	responsibility to deallocate the allocated memory.
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	@pre OpenL() is called.
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	@leave KErrCorrupt The file is corrupted.
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	@leave KErrNoMemory There is not enough memory for the decompressed data.
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	Some other error codes are possible too.
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   177
	*/
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   178
	Ptr8* DictionaryDecompressedResourceDataL(
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								TInt aResourceIndex,
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								TUint aFlags,
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								const SDictionaryCompressionData& aDictionaryCompressionData,
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								const Ptr16* aIndex) const;
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   183
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   184
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	/** 
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   186
	The method will decomress the dictionary compressed data (aDictionaryCompressionData argument) and append
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	the decompressed data to the end of std::vector<RDictionaryCompressionBitStream> 
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	(aStackOfDictionaryCompressionBitStreams argument).
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   189
	*/
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   190
	void AppendDictionaryCompressionBitStreamL(
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   191
								std::vector<RDictionaryCompressionBitStream>& aStackOfDictionaryCompressionBitStreams,
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   192
								TUint aFlags,
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								const SDictionaryCompressionData& aDictionaryCompressionData,
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   194
								TInt aStartOfBitData,
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   195
								TInt aStartOfIndex,
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								TInt aIndexEntry) const;
25
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   197
	
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	/**
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	Get the two bytes(in Little Endian format) from the specified buffer
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	@param aBuffer Buffer address from which 2-bytes are to be achieved.
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	@param aIndexOfFirstByte Offset of the first byte to be retrieved from the
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           buffer.
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	@return 2-bytes read from the buffer.
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	*/
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   205
	
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	TInt LittleEndianTwoByteInteger(const TUint8* aBuffer,const TInt& aIndexOfFirstByte,TInt aLength) const;
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   207
25
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   208
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private:
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   210
	std::ifstream* iResourceContents;	
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   211
	TInt iSizeOfLargestResourceWhenCompletelyUncompressed;
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   212
	//basically an array of (unsigned) 16-bit file-positions - 
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   213
	//this is only used for non-dictionary-compressed resource files
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   214
	Ptr16* iIndex; 
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   215
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	//the position of this member in the class is exposed because RResourceFile::Offset() is 
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	//an inline function accessing "iOffset". RResourceFileImpl is an implementation class for
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	//RResourceFile class. The "iOffset" offset from the beginning of the class must be exactly
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   219
	//12 bytes.
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	TInt iOffset; 
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   221
	TExtra* iExtra;
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   222
	TUint32 iFlagsAndNumberOfResources;
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	};
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struct SDictionaryCompressionData
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	{
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 	inline SDictionaryCompressionData() :
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		iStartOfDictionaryData(0),
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		iStartOfDictionaryIndex(0),
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		iNumberOfDictionaryEntries(0),
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		iStartOfResourceData(0),
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		iStartOfResourceIndex(0),
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		iNumberOfBitsUsedForDictionaryTokens(0), 
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		iCachedDictionaryIndex(0),
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		iCachedResourceBuffer(0)// = NULL;
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		{
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		}
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	TInt iStartOfDictionaryData;
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	TInt iStartOfDictionaryIndex;
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	TInt iNumberOfDictionaryEntries;
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	TInt iStartOfResourceData;
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	TInt iStartOfResourceIndex;
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	TInt iNumberOfBitsUsedForDictionaryTokens;
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	TUint16* iCachedDictionaryIndex;
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	TUint8* iCachedResourceBuffer;
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	};
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25
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/** 
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Stores the RSC filesize, offset and the bit-array 
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representing resources containing compressed unicode.
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*/
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class RResourceFileImpl::TExtra
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	{
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public:
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	TExtra();
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	~TExtra();
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	/**
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	Finds whether the specified resource contain compressed unicode
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	@param aRscIdx Resource Index
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	@return Status of whether the resource is actually present or not.
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	*/
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	TInt32 ContainsCompressedUnicode(TInt& aRscIdx, TBool aFirstRscIsGen) const;
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private:
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	// Prevent default copy constructor
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	TExtra(const TExtra&);
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	// Prevent default "=" operator
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	TExtra& operator=(const TExtra&);
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public:
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	// RSC file UID
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	TUidType iUidType;
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	// An array of bits, one for each resource in the resource file
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	Ptr8* iBitArrayOfResourcesContainingCompressedUnicode;
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	SDictionaryCompressionData iDictionaryCompressionData;
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	// Offset of RSC chunk
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	TInt iFileOffset;	
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	// RSC file size 
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	TUint32 iFileSize;		
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	};
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#endif//__BARSCIMPL_H__