diff -r 000000000000 -r c6b0df440bee dbgsrv/coredumpserver/plugins/formatters/symbianelf/selflib/selflib.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dbgsrv/coredumpserver/plugins/formatters/symbianelf/selflib/selflib.cpp	Tue Mar 02 10:33:16 2010 +0530
@@ -0,0 +1,734 @@
+// Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+//	Classes that allow the editing and creation of Symbian ELF files
+//
+
+/**
+ * @file selflib.cpp
+ * @prototype
+ */
+
+#include <f32file.h>
+
+#include "selflib.h"
+#include "debuglogging.h"
+#include "symbianelfstringinfov2.h"
+#include "symbianelfstringinfo.h"
+
+/**
+ * First stage construction
+ * @return Pointer to new CSELFEditor object
+ * @leave One of the System Wide Error Codes
+ */
+EXPORT_C CSELFEditor* CSELFEditor::NewL(const TDesC& aFilename)
+	{
+	LOG_ENTRY();
+
+	CSELFEditor* self = CSELFEditor::NewLC(aFilename);
+	CleanupStack::Pop();
+
+	return self;
+	}
+
+/**
+ * First stage construction. Object is left upon cleanup stack
+ * @return Pointer to new CSELFEditor object
+ * @leave One of the System Wide Error Codes
+ */
+EXPORT_C CSELFEditor* CSELFEditor::NewLC(const TDesC& aFilename)
+	{
+	LOG_ENTRY();
+
+	CSELFEditor* self = new(ELeave)CSELFEditor();
+	CleanupStack::PushL(self);
+	self->ConstructL(aFilename);
+
+	return self;
+	}
+
+/**
+ * CSELFEditor Desctructor
+ */
+CSELFEditor::~CSELFEditor()
+	{
+	LOG_ENTRY();
+
+	delete iRawData;
+	delete iStringTable;
+
+	iELFFile.Close();
+	iFsSession.Close();
+	iNewSegments.Close();
+	iProgramHeaders.Close();
+	}
+
+/**
+ * Second stage safe construction
+ * @leave One of the System Wide Error Codes
+ */
+void CSELFEditor::ConstructL(const TDesC& aFilename)
+	{
+	LOG_ENTRY();
+
+	User::LeaveIfError(iFsSession.Connect());
+	User::LeaveIfError(iELFFile.Open(iFsSession, aFilename, EFileWrite));
+
+	TInt fileSize;
+	User::LeaveIfError(iELFFile.Size(fileSize));
+
+	//Check its big enough to at least read the header
+	if(fileSize < sizeof(Elf32_Ehdr))
+		{
+		LOG_MSG("\tCSELFEditor::ConstructL --> File is not big enough to be an ELF file");
+		User::Leave(KErrCorrupt);
+		}
+
+	CacheELFHeaderL();
+
+	//Validate the ELF file
+	if(!IsValidELFFile())
+		User::Leave(KErrCorrupt);
+
+	if(!IsELFFileSupported())
+		User::Leave(KErrNotSupported);
+
+	iRawData = new(ELeave) CDesC8ArrayFlat(1);
+
+	CacheProgramHeadersL();
+	CacheStringTableL();
+	}
+
+/**
+ * Caches ELF File internally in this object
+ * @see GetELFHeader
+ * @leave One of the system wide error codes
+ */
+void CSELFEditor::CacheELFHeaderL()
+	{
+	//Read the ELF header
+	TUint fileLocation = 0;
+	TPtr8 hdrDes((TUint8*)&iELFHeader, sizeof(Elf32_Ehdr));
+	User::LeaveIfError(iELFFile.Read(fileLocation, hdrDes));
+	}
+
+/**
+ * CSELFEditor Constructor
+ */
+CSELFEditor::CSELFEditor()
+	{}
+
+/**
+ * This ELF library currently only supports a specific subset of the ELF standard.
+ * This function makes sure the ELF file supplied is part of that subset. These are the things
+ * we do not currently support:
+ * 1. 64 Bit ELF
+ * 2. ELFDATA2MSB File class (Big Endian)
+ * 3. Any sections
+ * 4. Any type other than ET_CORE
+ *
+ * @return TBool indicating if the file is OK to continue with
+ */
+TBool CSELFEditor::IsELFFileSupported()
+	{
+	LOG_ENTRY();
+
+	TBool supported = ETrue;
+	if(iELFHeader.e_ident[EI_CLASS] != ELFCLASS32)
+		{
+		LOG_MSG("\tCSELFEditor::IsElfFileSupported() --> Non 32 bit files are not supported");
+		supported = EFalse;
+		}
+
+	if(iELFHeader.e_ident[EI_DATA] != ELFDATA2LSB)
+		{
+		LOG_MSG("\tCSELFEditor::IsElfFileSupported() --> Only support Little Endian");
+		supported = EFalse;
+		}
+
+	if(iELFHeader.e_type != ET_CORE)
+		{
+		LOG_MSG("\tCSELFEditor::IsElfFileSupported() --> Only support Core Files");
+		supported = EFalse;
+		}
+
+	if(iELFHeader.e_shoff != 0 || iELFHeader.e_shnum != 0)
+		{
+		LOG_MSG("\tCSELFEditor::IsElfFileSupported() --> Do not support Sections");
+		supported = EFalse;
+		}
+
+	return supported;
+	}
+
+/**
+ * Validates the ELF file by looking at the signature
+ * @return Boolean indicating whether or not the file is valid ELF
+ */
+TBool CSELFEditor::IsValidELFFile()
+	{
+	LOG_ENTRY();
+
+	//Check signature
+	return iELFHeader.e_ident[EI_MAG0] == ELFMAG0 &&
+		iELFHeader.e_ident[EI_MAG1] == ELFMAG1 &&
+		iELFHeader.e_ident[EI_MAG2] == ELFMAG2 &&
+		iELFHeader.e_ident[EI_MAG3] == ELFMAG3;
+	}
+
+/**
+ * Provides the ELF header of this file
+ * @param aELFHeader Holds the ELF header after the call
+ */
+EXPORT_C void CSELFEditor::GetELFHeader(Elf32_Ehdr& aELFHeader)
+	{
+	LOG_ENTRY();
+	aELFHeader = iELFHeader;
+	}
+
+/**
+ * Caches the program headers from the file into this object
+ * @leave One of the system wide codes
+ */
+void CSELFEditor::CacheProgramHeadersL()
+	{
+	LOG_ENTRY();
+
+	Elf32_Phdr progHeader;
+	TPtr8 phdrPtr((TUint8*)&progHeader, sizeof(Elf32_Phdr));
+
+	TUint nextPh = iELFHeader.e_phoff;
+	for(TUint i = 0; i < iELFHeader.e_phnum; i++)
+		{
+		User::LeaveIfError(iELFFile.Read(nextPh, phdrPtr));
+		iProgramHeaders.AppendL(progHeader);
+		nextPh += sizeof(Elf32_Phdr);
+		}
+	}
+
+/**
+ * Inserts variant specific data into the ELF file
+ * @param aVarData The binary data to be inserted into the ELF file
+ * @leave One of the system wide codes
+ */
+EXPORT_C void CSELFEditor::InsertVariantSpecificDataL(const TDesC8& aVarData)
+	{
+	LOG_ENTRY();
+
+	//Store the data in the raw data array, and record its position to associate with the new section
+	iRawData->AppendL(aVarData);
+	TUint position = iRawData->Count() - 1;
+
+	//Now create the variant sepcific data dhdr and structure
+	TSELFSegment newSegment;
+
+	newSegment.iPhdr.p_type = PT_NOTE;
+	newSegment.iPhdr.p_offset = 0;    //Fill in when we write the file
+	newSegment.iPhdr.p_vaddr = 0;
+	newSegment.iPhdr.p_paddr = 0;
+	newSegment.iPhdr.p_filesz =0;
+	newSegment.iPhdr.p_memsz = 0;
+	newSegment.iPhdr.p_flags = 0;
+	newSegment.iPhdr.p_align = sizeof(TUint);
+
+	newSegment.iDhdr.d_name = 0;		//Fill in when we write the file (we need the string table)
+	newSegment.iDhdr.d_type = ESYM_NOTE_VARIANT_DATA;
+	newSegment.iDhdr.d_version = 0;	//Fill in when we write the file (we need the string table)
+	newSegment.iDhdr.d_elemnum = 1;
+	newSegment.iDhdr.d_descrsz = sizeof(Sym32_variant_spec_data);
+
+	Sym32_variant_spec_data* variantData = (Sym32_variant_spec_data*)(&newSegment.iType);
+	variantData->es_data = position;			//This data is in the iRawData until the write
+	variantData->es_size = aVarData.Size();
+
+	iNewSegments.AppendL(newSegment);
+	++iELFHeader.e_phnum;
+	}
+
+/**
+ * Commits any changes made in the CSELFEditor to the ELF file
+ * @leave One of the system wide codes
+ */
+EXPORT_C void CSELFEditor::WriteELFUpdatesL()
+	{
+	LOG_ENTRY();
+
+	//There may be nothing to do
+	if(iNewSegments.Count() == 0)
+		return;
+
+	//Create tmp file
+	TBuf<KMaxFileName> tmpFilename;
+	RFile tmpFile;
+	User::LeaveIfError(tmpFile.Temp(iFsSession, KTempFileLocation, tmpFilename, EFileWrite));
+	CleanupClosePushL(tmpFile);
+
+	//Log file name
+	TPtr8 smallName((TUint8*)tmpFilename.Ptr(), 2*tmpFilename.Length(), 2*tmpFilename.Length());
+	LOG_MSG2("\tWriteELFUpdatesL() --> Writing new temporary updates to [%S]", &smallName);
+
+	TUint numberofPhdrs = 0;
+
+	//Leave space for elf header plus program header table at start
+	TUint spaceToLeave =+ sizeof(Elf32_Ehdr) + (iNewSegments.Count() + iProgramHeaders.Count() ) * sizeof(Elf32_Phdr);
+	PutEmptySpaceAtEndOfFileL(tmpFile, spaceToLeave);
+
+	TUint phdrLoc = sizeof(Elf32_Ehdr); //phdr table starts just after ELF header
+	TUint dataLoc = spaceToLeave;
+
+	LOG_MSG("WriteELFUpdatesL --> Copying existing program headers to the tmp file");
+
+	//Store new program headers as we go
+	RArray<Elf32_Phdr> newProgramHeaders;
+
+	{
+	Elf32_Phdr phdr;
+	TPtr8 phdrPtr((TUint8*)&phdr, sizeof(Elf32_Phdr), sizeof(Elf32_Phdr));
+
+	for(TUint i = 0; i < iProgramHeaders.Count(); i++)
+		{
+		phdr = iProgramHeaders[i];
+
+		//Now we put the neccesary data after the phdr table
+		if(phdr.p_type == PT_LOAD && phdr.p_filesz != 0 && phdr.p_offset != 0)
+			{
+			phdr.p_offset = CopyFromELFFileL(phdr.p_offset, phdr.p_filesz, tmpFile, dataLoc);
+			dataLoc += phdr.p_filesz;
+			}
+		else if(phdr.p_type == PT_NOTE)
+			{
+			//Read the symbian descriptor
+			READ_STRUCTL(Sym32_dhdr, symd, iELFFile, phdr.p_offset);
+
+			//TODO: The fact that we need this *MAY* indicate flaws in SELF format. It would be nice
+			//to be able to copy a bit that was completely described by the dhdr
+			if(symd.d_type == ESYM_NOTE_REG)
+				{
+				//registers cant just be blindly copied as they contain offsets that need updating
+				TUint sizeWritten = 0;
+				phdr.p_offset = CopyRegistersL(tmpFile, phdr.p_offset, dataLoc, sizeWritten);
+				dataLoc += sizeWritten;
+				}
+			else if(symd.d_type == ESYM_NOTE_VARIANT_DATA)
+				{
+				//Variant data cant be blindly copied either as they have offsets too
+				TUint sizeWritten = 0;
+				phdr.p_offset = CopyVariantDataL(tmpFile, phdr.p_offset, dataLoc, sizeWritten);
+				dataLoc += sizeWritten;
+				}
+			//special case - needs updating so do after everything else
+			else if(symd.d_type == ESYM_NOTE_STR)
+				{
+				continue;
+				}
+			else
+				{
+				TUint sizetoCopy = sizeof(Sym32_dhdr) + symd.d_descrsz * symd.d_elemnum;
+				phdr.p_offset = CopyFromELFFileL(phdr.p_offset, sizetoCopy, tmpFile, dataLoc);
+				dataLoc += sizetoCopy;
+				}
+
+			}
+
+		//Write the updated program header
+ 		User::LeaveIfError(tmpFile.Write(phdrLoc, phdrPtr));
+		phdrLoc += sizeof(Elf32_Phdr);
+		newProgramHeaders.AppendL(phdr);
+		++numberofPhdrs;
+		}
+	LOG_MSG2("WriteELFUpdatesL --> Copied [%d] existing program headers (minus string table)", numberofPhdrs);
+	}
+
+	//Now we add the new segments
+	
+	//This is for the string table
+	TBuf8<KMaxFileName> varDataBuf;
+	varDataBuf.Format(_L8("CORE.SYMBIAN.VARDATA"));
+	TUint versionIndex = iStringTable->GetIndex(KSymbianElfCoreDumpVersionV2);
+
+	for(TUint i = 0; i < iNewSegments.Count(); i++)
+		{
+		TSELFSegment segment = iNewSegments[i];
+
+		//Update the program header and the d_hdr
+		segment.iPhdr.p_offset = dataLoc;
+
+
+		TInt index = iStringTable->AddStringL(varDataBuf);
+		segment.iDhdr.d_name = (index == KErrNotFound) ? ESYM_STR_UNDEF : index;
+		segment.iDhdr.d_version = versionIndex;
+
+		Sym32_variant_spec_data* variantData = (Sym32_variant_spec_data*)(&segment.iType);
+		TUint dataIndex = variantData->es_data;
+		variantData->es_data = dataLoc + sizeof(Sym32_variant_spec_data) + sizeof(Sym32_dhdr);
+
+		//Write the phdr
+		TPtr8 nphdrPtr((TUint8*)&segment.iPhdr, sizeof(Elf32_Phdr), sizeof(Elf32_Phdr));
+		User::LeaveIfError(tmpFile.Write(phdrLoc, nphdrPtr));
+		newProgramHeaders.AppendL(segment.iPhdr);
+		phdrLoc += sizeof(Elf32_Phdr);
+		++numberofPhdrs;
+
+		//Write the dhdr
+		TPtr8 ndhdrPtr((TUint8*)&segment.iDhdr, sizeof(Sym32_dhdr), sizeof(Sym32_dhdr));
+		User::LeaveIfError(tmpFile.Write(dataLoc, ndhdrPtr));
+		dataLoc += sizeof(Sym32_dhdr);
+
+		//Write the var struct
+		TPtr8 nvarHdr((TUint8*)&segment.iType, sizeof(Sym32_variant_spec_data), sizeof(Sym32_variant_spec_data));
+		User::LeaveIfError(tmpFile.Write(dataLoc, nvarHdr));
+		dataLoc += sizeof(Sym32_variant_spec_data);
+
+		//Write the data
+		User::LeaveIfError(tmpFile.Write(dataLoc, (*iRawData)[dataIndex]));
+		dataLoc += variantData->es_size;
+		}
+
+	//Write the string info
+	Elf32_Phdr sphdr;
+	TPtr8 sphdrPtr((TUint8*)&sphdr, sizeof(Elf32_Phdr), sizeof(Elf32_Phdr));
+
+	sphdr.p_type = PT_NOTE;
+	sphdr.p_offset = WriteStringInfoL(tmpFile, dataLoc);
+	sphdr.p_vaddr = 0;
+	sphdr.p_paddr = 0;
+	sphdr.p_filesz = 0;
+	sphdr.p_memsz = 0;
+	sphdr.p_flags = 0;
+	sphdr.p_align = 4;
+
+	User::LeaveIfError(tmpFile.Write(phdrLoc, sphdrPtr));
+	newProgramHeaders.Append(sphdr);
+	phdrLoc += sizeof(Elf32_Phdr);
+	++numberofPhdrs;
+
+	//Last thing, is to finally update the ELF header and write it
+	iELFHeader.e_phoff = sizeof(Elf32_Ehdr);
+	iELFHeader.e_phnum = numberofPhdrs;
+
+	LOG_MSG("\tWriting final ELF Header");
+	TPtr8 hdrPtr((TUint8*)&iELFHeader, sizeof(Elf32_Ehdr), sizeof(Elf32_Ehdr));
+	User::LeaveIfError(tmpFile.Write(0, hdrPtr));
+
+	tmpFile.Flush();
+	CleanupStack::PopAndDestroy(&tmpFile);
+
+	TBuf<KMaxFileName> origFilename;
+	iELFFile.FullName(origFilename);
+	iELFFile.Close();
+
+	SwapFilesL(tmpFilename, origFilename);
+
+	//Open the file again for further use and reset data structs
+	User::LeaveIfError(iELFFile.Open(iFsSession, origFilename, EFileWrite));
+
+	iNewSegments.Reset();
+	iProgramHeaders.Close();
+	iProgramHeaders = newProgramHeaders;  //Update with latest p hdrs
+	}
+
+/**
+ * Writes the string info at specified offset
+ * This writes the Sym32_dhdr and the string info
+ * @param aFile File to write to
+ * @param aOffset Position in file to write to. This is updated and finishes at the next free point to
+ * write to in this file
+ * @leave One of the system wide codes
+ * @return Offset in the file where this was written to (the initial value of aOffset)
+ */
+TUint CSELFEditor::WriteStringInfoL(RFile aFile, TUint& aOffset)
+	{
+	LOG_ENTRY();
+
+	TUint writeStart = aOffset;
+
+	Sym32_dhdr dhdr;
+	TPtr8 dhdrPtr((TUint8*)&dhdr, sizeof(Sym32_dhdr), sizeof(Sym32_dhdr));
+
+	TInt index = iStringTable->GetIndex(KStr);
+	dhdr.d_name		= (index == KErrNotFound) ? ESYM_STR_UNDEF : index;
+	dhdr.d_descrsz	= iStringTable->GetSize();
+	dhdr.d_type		= ESYM_NOTE_STR;
+	dhdr.d_version	= iStringTable->GetIndex(KSymbianElfCoreDumpVersionV2);
+    dhdr.d_elemnum	= 1;
+
+	//Write the dhdr
+	User::LeaveIfError(aFile.Write(aOffset, dhdrPtr));
+	aOffset += sizeof(Sym32_dhdr);
+
+	//Write the string info
+	TText8* buf = iStringTable->GetAllStrings();
+	TUint size = iStringTable->GetSize();
+
+	TPtr8 data((TUint8*)buf, size, size);
+	User::LeaveIfError(aFile.Write(aOffset, data));
+	aOffset += size;
+
+	return writeStart;
+	}
+
+/**
+ * Copies the registers to aFile sensibly, updating the offsets accordingly
+ * @param aFile Destination file
+ * @param aSrcRead Place in src file where d_hdr starts
+ * @param aDestWrite Destination to write to
+ * @leave One of the system wide codes
+ */
+TUint CSELFEditor::CopyRegistersL(RFile aFile, TUint aSrcRead, TUint aDestWrite, TUint& aSizeWritten)
+	{
+	LOG_ENTRY();
+
+	aSizeWritten = 0;
+	TUint srcpos = aSrcRead;
+	TUint destpos = aDestWrite;
+
+	//Write the dhdr, it wont change
+	READ_STRUCTL(Sym32_dhdr, dhdr, iELFFile, srcpos);
+	CopyFromELFFileL(srcpos, sizeof(Sym32_dhdr), aFile, destpos);
+	srcpos += sizeof(Sym32_dhdr);
+	destpos += sizeof(Sym32_dhdr);
+
+	//And the reginfod struct
+	READ_STRUCTL(Sym32_reginfod, reginfo, iELFFile, srcpos);
+	CopyFromELFFileL(srcpos, sizeof(Sym32_reginfod), aFile, destpos);
+	srcpos += sizeof(Sym32_reginfod);
+	destpos += sizeof(Sym32_reginfod);
+
+	RBuf8 regVals;
+	regVals.CreateL(reginfo.rid_num_registers * sizeof(TUint64));
+	regVals.CleanupClosePushL();
+
+	//Now we need to go through the individual register values. They are offset to somewhere and
+	//we need to figure out where we will be putting them first
+	TUint regoffset = destpos + (reginfo.rid_num_registers * sizeof(Sym32_regdatad) );
+	for(TUint i = 0; i < reginfo.rid_num_registers; i++)
+		{
+		READ_STRUCTL(Sym32_regdatad, regdata, iELFFile, srcpos);
+		srcpos += sizeof(Sym32_regdatad);
+
+		//update the offset
+		TUint srcOffset = regdata.rd_data;
+		regdata.rd_data = regoffset;
+		regoffset += sizeof(TUint64);
+
+		//Write it to the file
+		TPtr8 dataPtr((TUint8*)&regdata, sizeof(Sym32_regdatad), sizeof(Sym32_regdatad));
+		User::LeaveIfError(aFile.Write(destpos, dataPtr));
+		destpos += sizeof(Sym32_regdatad);
+
+		//Read the appropriate value
+		TUint32 regValue = 0;
+		TPtr8 regValuePtr((TUint8*)&regValue, sizeof(TUint64), sizeof(TUint64));
+
+		switch(reginfo.rid_repre)
+			{
+			case ESYM_REG_8:
+				User::LeaveIfError(iELFFile.Read(srcOffset, regValuePtr, sizeof(TUint8)));
+				break;
+			case ESYM_REG_16:
+				User::LeaveIfError(iELFFile.Read(srcOffset, regValuePtr, sizeof(TUint16)));
+				break;
+			case ESYM_REG_32:
+				User::LeaveIfError(iELFFile.Read(srcOffset, regValuePtr, sizeof(TUint32)));
+				break;
+			case ESYM_REG_64:
+				User::LeaveIfError(iELFFile.Read(srcOffset, regValuePtr, sizeof(TUint64)));
+				break;
+			default:
+				regValue = 0;
+				break;
+			}
+
+		regValuePtr.SetLength(sizeof(TUint64));
+		regVals.Append(regValuePtr);
+		}
+
+	//Now write the values
+	User::LeaveIfError(aFile.Write(destpos, regVals));
+	destpos += regVals.Size();
+
+	CleanupStack::PopAndDestroy(&regVals);
+
+	aSizeWritten = destpos - aDestWrite;
+	return aDestWrite;
+	}
+
+/**
+ * Copies the variant data to aFile sensibly, updating the offsets accordingly
+ * @param aFile Destination file
+ * @param aSrcRead Place in src file where d_hdr starts
+ * @param aDestWrite Destination to write to
+ * @leave One of the system wide codes
+ */
+TUint CSELFEditor::CopyVariantDataL(RFile aFile, TUint aSrcRead, TUint aDestWrite, TUint& aSizeWritten)
+	{
+	LOG_ENTRY();
+
+	aSizeWritten = 0;
+	TUint srcpos = aSrcRead;
+	TUint destpos = aDestWrite;
+
+	//Write the dhdr, it wont change
+	READ_STRUCTL(Sym32_dhdr, dhdr, iELFFile, srcpos);
+	CopyFromELFFileL(srcpos, sizeof(Sym32_dhdr), aFile, destpos);
+	srcpos += sizeof(Sym32_dhdr);
+	destpos += sizeof(Sym32_dhdr);
+
+	//And the var data struct
+	READ_STRUCTL(Sym32_variant_spec_data, varData, iELFFile, srcpos);
+	varData.es_data = destpos + sizeof(Sym32_variant_spec_data);
+
+	TPtr8 varDataPtr((TUint8*)&varData, sizeof(Sym32_variant_spec_data), sizeof(Sym32_variant_spec_data));
+	User::LeaveIfError(aFile.Write(destpos, varDataPtr));
+	srcpos += sizeof(Sym32_variant_spec_data);
+	destpos += sizeof(Sym32_variant_spec_data);
+
+	//And the data
+	CopyFromELFFileL(srcpos, varData.es_size, aFile, destpos);
+	srcpos += varData.es_size;
+	destpos += varData.es_size;
+
+	aSizeWritten = destpos - aDestWrite;
+	return aDestWrite;
+	}
+
+/**
+ * Copies a part of the ELF file into a destination file
+ * @param aStartPoint Point in file to start copying
+ * @param aSize Amount to copy
+ * @param aDestinationFile Destination file to copy to
+ * @param aDestWrite Position in destination to write to
+ * @return Place in file where this has been written
+ * @leave One of the System wide codes
+ */
+TUint CSELFEditor::CopyFromELFFileL(TUint aStartPoint, TUint aSize, RFile aDestinationFile, TUint aDestWrite)
+	{
+	TUint readpos = aStartPoint;
+	TUint endpoint = aStartPoint + aSize;
+	TUint destpos = aDestWrite;
+
+	//Use free memory/10 for our buffering
+	TInt block = 0;
+	TInt freemem = User::Available(block);
+	TInt maxfilecopysize = freemem/10;
+
+	RBuf8 copybuf;
+	copybuf.CreateL(maxfilecopysize);
+	copybuf.CleanupClosePushL();
+
+	while(readpos < endpoint)
+		{
+		TUint readsize = maxfilecopysize;
+		if(readpos + readsize > endpoint)
+			readsize = endpoint - readpos;
+
+		if(readsize != copybuf.MaxLength())
+			copybuf.ReAllocL(readsize);
+
+		User::LeaveIfError(iELFFile.Read(readpos, copybuf, readsize));
+		User::LeaveIfError(aDestinationFile.Write(destpos, copybuf));
+
+		copybuf.Zero();
+
+		destpos += readsize;
+		readpos += readsize;
+		}
+
+	CleanupStack::PopAndDestroy(&copybuf);
+
+	return aDestWrite;
+	}
+
+/**
+ * Caches the string table in source ELF file into our string info table object
+ * @leaves One of the system wide codes
+ */
+void CSELFEditor::CacheStringTableL()
+	{
+	LOG_ENTRY();
+
+	for(TUint i = 0; i < iProgramHeaders.Count(); i++)
+		{
+		Elf32_Phdr phdr = iProgramHeaders[i];
+
+		READ_STRUCTL(Sym32_dhdr, dhdr, iELFFile, phdr.p_offset);
+		if(dhdr.d_type == ESYM_NOTE_STR)
+			{
+			iStringTableDhdr = dhdr;
+
+			RBuf8 stringData;
+			stringData.CreateL(dhdr.d_descrsz);
+			stringData.CleanupClosePushL();
+
+			User::LeaveIfError(iELFFile.Read(phdr.p_offset + sizeof(Sym32_dhdr), stringData));
+			iStringTable = CStringInfoTableV2::NewL(stringData);
+
+			CleanupStack::PopAndDestroy(&stringData);
+			return;
+			}
+		}
+	}
+
+/**
+ * Utility function to leave space in the file
+ * @param aFile
+ * @param aSize
+ */
+void CSELFEditor::PutEmptySpaceAtEndOfFileL(RFile aFile, TUint aSize)
+	{
+	LOG_ENTRY();
+
+	RBuf8 empty;
+	empty.CreateL(aSize);
+	empty.CleanupClosePushL();
+	empty.SetLength(aSize);
+
+	LOG_MSG2("\tPutEmptySpaceAtEndOfFileL --> Leaving [0x%X] bytes", aSize);
+	User::LeaveIfError(aFile.Write(empty));
+
+	CleanupStack::PopAndDestroy(&empty);
+	}
+
+/**
+ * Swaps 2 files and deletes the original destination
+ * @leave One of the system wide codes
+ */
+void CSELFEditor::SwapFilesL(const TDesC& aSrc, const TDesC& aDest)
+	{
+	LOG_ENTRY();
+
+	//1. Back up the destination file in case anything fails
+	TBuf<KMaxFileName> backupName;
+	backupName.Copy(aDest);
+	backupName.Append(_L(".bak"));
+
+	CFileMan* fmanager = CFileMan::NewL(iFsSession);
+	CleanupStack::PushL(fmanager);
+	
+	User::LeaveIfError(fmanager->Rename(aDest, backupName));
+	
+	//2. Rename the src file to the dest file
+	TInt err = fmanager->Move(aSrc, aDest);
+	if(KErrNone != err)
+		{
+		//rename failed so restore original file
+		TPtr8 dest8((TUint8*)aDest.Ptr(), 2*aDest.Length(), 2*aDest.Length());
+		RDebug::Printf("\nFailed to move the tmp file so restoring original file [%S]", &dest8);
+		User::LeaveIfError(fmanager->Rename(backupName, aDest));
+		User::Leave(err);
+		}
+
+	//3. Delete the backup file file
+	User::LeaveIfError(fmanager->Delete(backupName));
+	CleanupStack::PopAndDestroy(fmanager);
+	}