author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 16 Apr 2010 15:05:20 +0300 | |
changeset 25 | 98b66e4fb0be |
child 33 | 8110bf1194d1 |
permissions | -rw-r--r-- |
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// Copyright (c) 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 "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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/** |
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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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*/ |
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void ReadL(TInt aPos,TUint8* aData,const TInt& aLength) ; |
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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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105 |
}; |
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106 |
|
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class TExtra; |
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108 |
|
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109 |
|
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110 |
private: |
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111 |
/** |
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112 |
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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*/ |
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void ReadL(const TUint32& aFlags, TInt aPos, TUint8* aData, const TInt& aLength); |
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119 |
|
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120 |
/** @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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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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SSigRecord FirstRecordL() const; |
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128 |
|
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129 |
|
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130 |
/** |
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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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133 |
*/ |
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void ReadHeaderAndResourceIndexL(); |
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135 |
|
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136 |
/** |
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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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139 |
|
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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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144 |
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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148 |
/** |
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149 |
The method will decompress the unicode data (aInputResourceData argument), allocate enough |
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150 |
memory from the heap for the decompressed data, copy the data there and return a pointer |
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151 |
to the decompressed data. |
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152 |
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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158 |
|
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159 |
/** |
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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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165 |
*/ |
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166 |
TInt LittleEndianTwoByteInteger(TUint8* aBuffer,const TInt& aIndexOfFirstByte) const; |
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Ptr8* GetDecompressedResourceDataL( |
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const TInt& aResourceIndex, |
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169 |
const TUint32& aFlags); |
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170 |
|
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171 |
private: |
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172 |
std::ifstream* iResourceContents; |
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TInt iSizeOfLargestResourceWhenCompletelyUncompressed; |
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// An array of (unsigned) 16-bit file-positions |
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TUint16* iIndex; |
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TInt iOffset; |
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177 |
TExtra* iExtra; |
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TUint32 iFlagsAndNumberOfResources; |
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179 |
}; |
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180 |
|
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181 |
|
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182 |
/** |
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183 |
Stores the RSC filesize, offset and the bit-array |
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184 |
representing resources containing compressed unicode. |
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185 |
*/ |
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186 |
class RResourceFileImpl::TExtra |
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187 |
{ |
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188 |
|
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189 |
public: |
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190 |
TExtra(); |
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191 |
~TExtra(); |
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192 |
/** |
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193 |
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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196 |
*/ |
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TInt32 ContainsCompressedUnicode(const TInt& aRscIdx) const; |
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198 |
|
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199 |
private: |
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200 |
// Prevent default copy constructor |
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201 |
TExtra(const TExtra&); |
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202 |
// Prevent default "=" operator |
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203 |
TExtra& operator=(const TExtra&); |
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204 |
|
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205 |
public: |
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206 |
// RSC file UID |
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207 |
sTUid iUid; |
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// An array of bits, one for each resource in the resource file |
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TUint8* iBitArrayOfResourcesContainingCompressedUnicode; |
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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__ |