e32tools/elf2e32/source/pl_elfconsumer.cpp
author yiluzhu
Fri, 11 Dec 2009 15:23:56 +0000
branchfix
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// Copyright (c) 2004-2009 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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// Implementation of the Class ElfConsumer for the elf2e32 tool
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// @internalComponent
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// @released
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// 
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//
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#include "pl_elfconsumer.h"
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#include "parameterlistinterface.h"
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#include "errorhandler.h"
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#include <iostream>
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#include <string>
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using std::list;
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using std::cout;
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using std::endl;
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using std::min;
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/**
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Constructor for class ElfConsumer
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@param aParameterListInterface - instance of class ParameterListInterface
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@internalComponent
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@released
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*/
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ElfConsumer::ElfConsumer(ParameterListInterface *aParameterListInterface) :\
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 ElfExecutable(aParameterListInterface) ,\
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 iMemBlock(NULL)
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{
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}
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/**
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Destructor for class ElfConsumer
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@internalComponent
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@released
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*/
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ElfConsumer::~ElfConsumer(){
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	DELETE_PTR_ARRAY(iMemBlock);
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}
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/**
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This operation takes the member of the ElfFileWriter object that is to be populated with the
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export info in the iExports member (from the iInputElfFile member of ElfConsumer).
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@param aFile - Elf file name
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@internalComponent
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@released
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*/
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PLUINT32 ElfConsumer::ReadElfFile(char* aFile){
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	FILE*	aFd;
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	if( (aFd = fopen(aFile,"rb")) == NULL) {
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		throw FileError(FILEOPENERROR, aFile);
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	}
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	fseek(aFd, 0, SEEK_END);
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	PLUINT32 aSz = ftell(aFd);
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	iMemBlock = new char[aSz];
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	fseek(aFd, 0, SEEK_SET);
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	// Certain Windows devices (e.g., network shares) limit the size of I/O operations to 64MB
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	// or less.  We read all the data in individual KMaxWindowsIOSize (32MB) chunks to be safe.
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	PLUINT32 chunkSize = 0;
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	for( PLUINT32 bytesRead = 0; bytesRead < aSz; bytesRead += chunkSize) {
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		chunkSize = min(aSz - bytesRead, PLUINT32(KMaxWindowsIOSize));
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		if( fread(iMemBlock + bytesRead, chunkSize, 1, aFd) != 1) {
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			throw FileError(FILEREADERROR, aFile);
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		}		
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	}
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	return 0;
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}
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/**
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Funtion for getting elf symbol list
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@param aList - list of symbols found in elf files
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@return - 0 for no exports in elf files, otherwise number of symbols found
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@internalComponent
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@released
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*/
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int ElfConsumer::GetElfSymbolList(list<Symbol*>& aList){
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	if( !iExports ) 
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		return 0;
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	//Get the exported symbols
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	vector<DllSymbol*> aTmpList = iExports->GetExports(true);
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	typedef vector<DllSymbol*> List;
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	List::iterator aItr = aTmpList.begin();
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	while( aItr != aTmpList.end() ){
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		aList.push_back((Symbol*) (*aItr));
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		aItr++;
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	}
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	aTmpList.clear();
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	return aList.size();
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}
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/**
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Funtion for getting image details
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@internalComponent
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@released
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*/
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void ElfConsumer::GetImageDetails(/*E32ImageInterface aInterface*/){
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}
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/**
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Funtion for processing elf file
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@internalComponent
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@released
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*/
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PLUINT32 ElfConsumer::ProcessElfFile(){
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	Elf32_Ehdr *aElfHdr = ELF_ENTRY_PTR(Elf32_Ehdr, iMemBlock, 0);
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	try
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	{
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		ElfExecutable::ProcessElfFile(aElfHdr);
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		/* The following is a workaround for the ARM linker problem.
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		 * Linker Problem: ARM linker generates Long ARM to Thumb veneers for which
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		 * relocation entries are not generated.
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		 * The linker problem is resolved in ARM Linker version RVCT 2.2 Build 616.
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		 * Hence the workaround is applicable only for executables generated
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		 * by ARM linker 2.2 and if build number is below 616.
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		 */
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		char * aARMCompiler = "ARM Linker, RVCT";
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		int length = strlen(aARMCompiler);
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		char * aCommentSection = ElfExecutable::FindCommentSection();
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   		/* The .comment section in an elf file contains the compiler version information and 
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   		 * it is used to apply the fore mentioned workaround. 
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   		 * Some build tool chains generating elf file output without the .comment section, 
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   		 * just to save the disk space. In this case the variable aCommentSection gets the NULL value.
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   		 * Solution: This workaround is only applicable for RVCT compiler. So if the .comment section 
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   		 * is not available in the elf file, then this workaround is no need to be applied.
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   		 */
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   		if(aCommentSection != NULL)
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   		{
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		if (!strncmp(aCommentSection, aARMCompiler, length))
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		{
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			int WorkAroundBuildNo = 616;
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			int BuildNo = 0;
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			char* RVCTVersion = aCommentSection+length;
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			/* RVCTVersion contains the following string
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			 * "<MajorVersion>.<MinorVersion> [Build <BuildNumber>]"
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			 * Example: "2.2 [Build 616]"
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			 */
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			String Version(RVCTVersion);
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			size_t pos = Version.find_last_of(' ');
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			size_t size = Version.size();
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			if (pos < size)
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			{
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				size_t index = pos + 1;
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				if (index < size)
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				{
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					BuildNo = atoi(strtok(RVCTVersion+index, "]"));
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				}
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			}
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			/* Workaround is applicable only when the version is 2.2 and if the
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			 * build number is below 616.
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			 */
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			size_t minorVersionPos = Version.find_first_of('.');
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			char RVCTMinorVersion='0';
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			if (minorVersionPos < size)
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			{
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				size_t index = minorVersionPos + 1;
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				if (index < size)
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				{
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					RVCTMinorVersion = *(RVCTVersion + index);
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				}
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			}
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			if ((*RVCTVersion == '2') && (RVCTMinorVersion == '2') &&
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				(BuildNo < WorkAroundBuildNo))
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			{ 
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				/* The static symbol table should be processed to identify the veneer symbols.
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				 * Relocation entries should be generated for these symbols if the linker 
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				 * is not generating the same.
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				 */
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				ElfExecutable::FindStaticSymbolTable();
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				ElfExecutable::ProcessVeneers();
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			}
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		}
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		}
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	}
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	catch(ErrorHandler&) 
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	{
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		throw;
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	} 
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	/*catch(...) // If there are any other unhandled exception,they are handled here.
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	{
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		//Warning to indicate that there had been an exception at this point.
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		MessageHandler::GetInstance()->ReportWarning(ELFFILEERROR,(char*)iParameterListInterface->ElfInput());
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		throw;
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	} */
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	return 0;
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}
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   222