1 // Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //	Classes that allow the editing and creation of Symbian ELF files

    15 //

    16 

    17 /**

    18  * @file selflib.cpp

    19  * @prototype

    20  */

    21 

    22 #include <f32file.h>

    23 

    24 #include "selflib.h"

    25 #include "debuglogging.h"

    26 #include "symbianelfstringinfov2.h"

    27 #include "symbianelfstringinfo.h"

    28 

    29 /**

    30  * First stage construction

    31  * @return Pointer to new CSELFEditor object

    32  * @leave One of the System Wide Error Codes

    33  */

    34 EXPORT_C CSELFEditor* CSELFEditor::NewL(const TDesC& aFilename)

    35 	{

    36 	LOG_ENTRY();

    37 

    38 	CSELFEditor* self = CSELFEditor::NewLC(aFilename);

    39 	CleanupStack::Pop();

    40 

    41 	return self;

    42 	}

    43 

    44 /**

    45  * First stage construction. Object is left upon cleanup stack

    46  * @return Pointer to new CSELFEditor object

    47  * @leave One of the System Wide Error Codes

    48  */

    49 EXPORT_C CSELFEditor* CSELFEditor::NewLC(const TDesC& aFilename)

    50 	{

    51 	LOG_ENTRY();

    52 

    53 	CSELFEditor* self = new(ELeave)CSELFEditor();

    54 	CleanupStack::PushL(self);

    55 	self->ConstructL(aFilename);

    56 

    57 	return self;

    58 	}

    59 

    60 /**

    61  * CSELFEditor Desctructor

    62  */

    63 CSELFEditor::~CSELFEditor()

    64 	{

    65 	LOG_ENTRY();

    66 

    67 	delete iRawData;

    68 	delete iStringTable;

    69 

    70 	iELFFile.Close();

    71 	iFsSession.Close();

    72 	iNewSegments.Close();

    73 	iProgramHeaders.Close();

    74 	}

    75 

    76 /**

    77  * Second stage safe construction

    78  * @leave One of the System Wide Error Codes

    79  */

    80 void CSELFEditor::ConstructL(const TDesC& aFilename)

    81 	{

    82 	LOG_ENTRY();

    83 

    84 	User::LeaveIfError(iFsSession.Connect());

    85 	User::LeaveIfError(iELFFile.Open(iFsSession, aFilename, EFileWrite));

    86 

    87 	TInt fileSize;

    88 	User::LeaveIfError(iELFFile.Size(fileSize));

    89 

    90 	//Check its big enough to at least read the header

    91 	if(fileSize < sizeof(Elf32_Ehdr))

    92 		{

    93 		LOG_MSG("\tCSELFEditor::ConstructL --> File is not big enough to be an ELF file");

    94 		User::Leave(KErrCorrupt);

    95 		}

    96 

    97 	CacheELFHeaderL();

    98 

    99 	//Validate the ELF file

   100 	if(!IsValidELFFile())

   101 		User::Leave(KErrCorrupt);

   102 

   103 	if(!IsELFFileSupported())

   104 		User::Leave(KErrNotSupported);

   105 

   106 	iRawData = new(ELeave) CDesC8ArrayFlat(1);

   107 

   108 	CacheProgramHeadersL();

   109 	CacheStringTableL();

   110 	}

   111 

   112 /**

   113  * Caches ELF File internally in this object

   114  * @see GetELFHeader

   115  * @leave One of the system wide error codes

   116  */

   117 void CSELFEditor::CacheELFHeaderL()

   118 	{

   119 	//Read the ELF header

   120 	TUint fileLocation = 0;

   121 	TPtr8 hdrDes((TUint8*)&iELFHeader, sizeof(Elf32_Ehdr));

   122 	User::LeaveIfError(iELFFile.Read(fileLocation, hdrDes));

   123 	}

   124 

   125 /**

   126  * CSELFEditor Constructor

   127  */

   128 CSELFEditor::CSELFEditor()

   129 	{}

   130 

   131 /**

   132  * This ELF library currently only supports a specific subset of the ELF standard.

   133  * This function makes sure the ELF file supplied is part of that subset. These are the things

   134  * we do not currently support:

   135  * 1. 64 Bit ELF

   136  * 2. ELFDATA2MSB File class (Big Endian)

   137  * 3. Any sections

   138  * 4. Any type other than ET_CORE

   139  *

   140  * @return TBool indicating if the file is OK to continue with

   141  */

   142 TBool CSELFEditor::IsELFFileSupported()

   143 	{

   144 	LOG_ENTRY();

   145 

   146 	TBool supported = ETrue;

   147 	if(iELFHeader.e_ident[EI_CLASS] != ELFCLASS32)

   148 		{

   149 		LOG_MSG("\tCSELFEditor::IsElfFileSupported() --> Non 32 bit files are not supported");

   150 		supported = EFalse;

   151 		}

   152 

   153 	if(iELFHeader.e_ident[EI_DATA] != ELFDATA2LSB)

   154 		{

   155 		LOG_MSG("\tCSELFEditor::IsElfFileSupported() --> Only support Little Endian");

   156 		supported = EFalse;

   157 		}

   158 

   159 	if(iELFHeader.e_type != ET_CORE)

   160 		{

   161 		LOG_MSG("\tCSELFEditor::IsElfFileSupported() --> Only support Core Files");

   162 		supported = EFalse;

   163 		}

   164 

   165 	if(iELFHeader.e_shoff != 0 || iELFHeader.e_shnum != 0)

   166 		{

   167 		LOG_MSG("\tCSELFEditor::IsElfFileSupported() --> Do not support Sections");

   168 		supported = EFalse;

   169 		}

   170 

   171 	return supported;

   172 	}

   173 

   174 /**

   175  * Validates the ELF file by looking at the signature

   176  * @return Boolean indicating whether or not the file is valid ELF

   177  */

   178 TBool CSELFEditor::IsValidELFFile()

   179 	{

   180 	LOG_ENTRY();

   181 

   182 	//Check signature

   183 	return iELFHeader.e_ident[EI_MAG0] == ELFMAG0 &&

   184 		iELFHeader.e_ident[EI_MAG1] == ELFMAG1 &&

   185 		iELFHeader.e_ident[EI_MAG2] == ELFMAG2 &&

   186 		iELFHeader.e_ident[EI_MAG3] == ELFMAG3;

   187 	}

   188 

   189 /**

   190  * Provides the ELF header of this file

   191  * @param aELFHeader Holds the ELF header after the call

   192  */

   193 EXPORT_C void CSELFEditor::GetELFHeader(Elf32_Ehdr& aELFHeader)

   194 	{

   195 	LOG_ENTRY();

   196 	aELFHeader = iELFHeader;

   197 	}

   198 

   199 /**

   200  * Caches the program headers from the file into this object

   201  * @leave One of the system wide codes

   202  */

   203 void CSELFEditor::CacheProgramHeadersL()

   204 	{

   205 	LOG_ENTRY();

   206 

   207 	Elf32_Phdr progHeader;

   208 	TPtr8 phdrPtr((TUint8*)&progHeader, sizeof(Elf32_Phdr));

   209 

   210 	TUint nextPh = iELFHeader.e_phoff;

   211 	for(TUint i = 0; i < iELFHeader.e_phnum; i++)

   212 		{

   213 		User::LeaveIfError(iELFFile.Read(nextPh, phdrPtr));

   214 		iProgramHeaders.AppendL(progHeader);

   215 		nextPh += sizeof(Elf32_Phdr);

   216 		}

   217 	}

   218 

   219 /**

   220  * Inserts variant specific data into the ELF file

   221  * @param aVarData The binary data to be inserted into the ELF file

   222  * @leave One of the system wide codes

   223  */

   224 EXPORT_C void CSELFEditor::InsertVariantSpecificDataL(const TDesC8& aVarData)

   225 	{

   226 	LOG_ENTRY();

   227 

   228 	//Store the data in the raw data array, and record its position to associate with the new section

   229 	iRawData->AppendL(aVarData);

   230 	TUint position = iRawData->Count() - 1;

   231 

   232 	//Now create the variant sepcific data dhdr and structure

   233 	TSELFSegment newSegment;

   234 

   235 	newSegment.iPhdr.p_type = PT_NOTE;

   236 	newSegment.iPhdr.p_offset = 0;    //Fill in when we write the file

   237 	newSegment.iPhdr.p_vaddr = 0;

   238 	newSegment.iPhdr.p_paddr = 0;

   239 	newSegment.iPhdr.p_filesz =0;

   240 	newSegment.iPhdr.p_memsz = 0;

   241 	newSegment.iPhdr.p_flags = 0;

   242 	newSegment.iPhdr.p_align = sizeof(TUint);

   243 

   244 	newSegment.iDhdr.d_name = 0;		//Fill in when we write the file (we need the string table)

   245 	newSegment.iDhdr.d_type = ESYM_NOTE_VARIANT_DATA;

   246 	newSegment.iDhdr.d_version = 0;	//Fill in when we write the file (we need the string table)

   247 	newSegment.iDhdr.d_elemnum = 1;

   248 	newSegment.iDhdr.d_descrsz = sizeof(Sym32_variant_spec_data);

   249 

   250 	Sym32_variant_spec_data* variantData = (Sym32_variant_spec_data*)(&newSegment.iType);

   251 	variantData->es_data = position;			//This data is in the iRawData until the write

   252 	variantData->es_size = aVarData.Size();

   253 

   254 	iNewSegments.AppendL(newSegment);

   255 	++iELFHeader.e_phnum;

   256 	}

   257 

   258 /**

   259  * Commits any changes made in the CSELFEditor to the ELF file

   260  * @leave One of the system wide codes

   261  */

   262 EXPORT_C void CSELFEditor::WriteELFUpdatesL()

   263 	{

   264 	LOG_ENTRY();

   265 

   266 	//There may be nothing to do

   267 	if(iNewSegments.Count() == 0)

   268 		return;

   269 

   270 	//Create tmp file

   271 	TBuf<KMaxFileName> tmpFilename;

   272 	RFile tmpFile;

   273 	User::LeaveIfError(tmpFile.Temp(iFsSession, KTempFileLocation, tmpFilename, EFileWrite));

   274 	CleanupClosePushL(tmpFile);

   275 

   276 	//Log file name

   277 	TPtr8 smallName((TUint8*)tmpFilename.Ptr(), 2*tmpFilename.Length(), 2*tmpFilename.Length());

   278 	LOG_MSG2("\tWriteELFUpdatesL() --> Writing new temporary updates to [%S]", &smallName);

   279 

   280 	TUint numberofPhdrs = 0;

   281 

   282 	//Leave space for elf header plus program header table at start

   283 	TUint spaceToLeave =+ sizeof(Elf32_Ehdr) + (iNewSegments.Count() + iProgramHeaders.Count() ) * sizeof(Elf32_Phdr);

   284 	PutEmptySpaceAtEndOfFileL(tmpFile, spaceToLeave);

   285 

   286 	TUint phdrLoc = sizeof(Elf32_Ehdr); //phdr table starts just after ELF header

   287 	TUint dataLoc = spaceToLeave;

   288 

   289 	LOG_MSG("WriteELFUpdatesL --> Copying existing program headers to the tmp file");

   290 

   291 	//Store new program headers as we go

   292 	RArray<Elf32_Phdr> newProgramHeaders;

   293 

   294 	{

   295 	Elf32_Phdr phdr;

   296 	TPtr8 phdrPtr((TUint8*)&phdr, sizeof(Elf32_Phdr), sizeof(Elf32_Phdr));

   297 

   298 	for(TUint i = 0; i < iProgramHeaders.Count(); i++)

   299 		{

   300 		phdr = iProgramHeaders[i];

   301 

   302 		//Now we put the neccesary data after the phdr table

   303 		if(phdr.p_type == PT_LOAD && phdr.p_filesz != 0 && phdr.p_offset != 0)

   304 			{

   305 			phdr.p_offset = CopyFromELFFileL(phdr.p_offset, phdr.p_filesz, tmpFile, dataLoc);

   306 			dataLoc += phdr.p_filesz;

   307 			}

   308 		else if(phdr.p_type == PT_NOTE)

   309 			{

   310 			//Read the symbian descriptor

   311 			READ_STRUCTL(Sym32_dhdr, symd, iELFFile, phdr.p_offset);

   312 

   313 			//TODO: The fact that we need this *MAY* indicate flaws in SELF format. It would be nice

   314 			//to be able to copy a bit that was completely described by the dhdr

   315 			if(symd.d_type == ESYM_NOTE_REG)

   316 				{

   317 				//registers cant just be blindly copied as they contain offsets that need updating

   318 				TUint sizeWritten = 0;

   319 				phdr.p_offset = CopyRegistersL(tmpFile, phdr.p_offset, dataLoc, sizeWritten);

   320 				dataLoc += sizeWritten;

   321 				}

   322 			else if(symd.d_type == ESYM_NOTE_VARIANT_DATA)

   323 				{

   324 				//Variant data cant be blindly copied either as they have offsets too

   325 				TUint sizeWritten = 0;

   326 				phdr.p_offset = CopyVariantDataL(tmpFile, phdr.p_offset, dataLoc, sizeWritten);

   327 				dataLoc += sizeWritten;

   328 				}

   329 			//special case - needs updating so do after everything else

   330 			else if(symd.d_type == ESYM_NOTE_STR)

   331 				{

   332 				continue;

   333 				}

   334 			else

   335 				{

   336 				TUint sizetoCopy = sizeof(Sym32_dhdr) + symd.d_descrsz * symd.d_elemnum;

   337 				phdr.p_offset = CopyFromELFFileL(phdr.p_offset, sizetoCopy, tmpFile, dataLoc);

   338 				dataLoc += sizetoCopy;

   339 				}

   340 

   341 			}

   342 

   343 		//Write the updated program header

   344  		User::LeaveIfError(tmpFile.Write(phdrLoc, phdrPtr));

   345 		phdrLoc += sizeof(Elf32_Phdr);

   346 		newProgramHeaders.AppendL(phdr);

   347 		++numberofPhdrs;

   348 		}

   349 	LOG_MSG2("WriteELFUpdatesL --> Copied [%d] existing program headers (minus string table)", numberofPhdrs);

   350 	}

   351 

   352 	//Now we add the new segments

   353 	

   354 	//This is for the string table

   355 	TBuf8<KMaxFileName> varDataBuf;

   356 	varDataBuf.Format(_L8("CORE.SYMBIAN.VARDATA"));

   357 	TUint versionIndex = iStringTable->GetIndex(KSymbianElfCoreDumpVersionV2);

   358 

   359 	for(TUint i = 0; i < iNewSegments.Count(); i++)

   360 		{

   361 		TSELFSegment segment = iNewSegments[i];

   362 

   363 		//Update the program header and the d_hdr

   364 		segment.iPhdr.p_offset = dataLoc;

   365 

   366 

   367 		TInt index = iStringTable->AddStringL(varDataBuf);

   368 		segment.iDhdr.d_name = (index == KErrNotFound) ? ESYM_STR_UNDEF : index;

   369 		segment.iDhdr.d_version = versionIndex;

   370 

   371 		Sym32_variant_spec_data* variantData = (Sym32_variant_spec_data*)(&segment.iType);

   372 		TUint dataIndex = variantData->es_data;

   373 		variantData->es_data = dataLoc + sizeof(Sym32_variant_spec_data) + sizeof(Sym32_dhdr);

   374 

   375 		//Write the phdr

   376 		TPtr8 nphdrPtr((TUint8*)&segment.iPhdr, sizeof(Elf32_Phdr), sizeof(Elf32_Phdr));

   377 		User::LeaveIfError(tmpFile.Write(phdrLoc, nphdrPtr));

   378 		newProgramHeaders.AppendL(segment.iPhdr);

   379 		phdrLoc += sizeof(Elf32_Phdr);

   380 		++numberofPhdrs;

   381 

   382 		//Write the dhdr

   383 		TPtr8 ndhdrPtr((TUint8*)&segment.iDhdr, sizeof(Sym32_dhdr), sizeof(Sym32_dhdr));

   384 		User::LeaveIfError(tmpFile.Write(dataLoc, ndhdrPtr));

   385 		dataLoc += sizeof(Sym32_dhdr);

   386 

   387 		//Write the var struct

   388 		TPtr8 nvarHdr((TUint8*)&segment.iType, sizeof(Sym32_variant_spec_data), sizeof(Sym32_variant_spec_data));

   389 		User::LeaveIfError(tmpFile.Write(dataLoc, nvarHdr));

   390 		dataLoc += sizeof(Sym32_variant_spec_data);

   391 

   392 		//Write the data

   393 		User::LeaveIfError(tmpFile.Write(dataLoc, (*iRawData)[dataIndex]));

   394 		dataLoc += variantData->es_size;

   395 		}

   396 

   397 	//Write the string info

   398 	Elf32_Phdr sphdr;

   399 	TPtr8 sphdrPtr((TUint8*)&sphdr, sizeof(Elf32_Phdr), sizeof(Elf32_Phdr));

   400 

   401 	sphdr.p_type = PT_NOTE;

   402 	sphdr.p_offset = WriteStringInfoL(tmpFile, dataLoc);

   403 	sphdr.p_vaddr = 0;

   404 	sphdr.p_paddr = 0;

   405 	sphdr.p_filesz = 0;

   406 	sphdr.p_memsz = 0;

   407 	sphdr.p_flags = 0;

   408 	sphdr.p_align = 4;

   409 

   410 	User::LeaveIfError(tmpFile.Write(phdrLoc, sphdrPtr));

   411 	newProgramHeaders.Append(sphdr);

   412 	phdrLoc += sizeof(Elf32_Phdr);

   413 	++numberofPhdrs;

   414 

   415 	//Last thing, is to finally update the ELF header and write it

   416 	iELFHeader.e_phoff = sizeof(Elf32_Ehdr);

   417 	iELFHeader.e_phnum = numberofPhdrs;

   418 

   419 	LOG_MSG("\tWriting final ELF Header");

   420 	TPtr8 hdrPtr((TUint8*)&iELFHeader, sizeof(Elf32_Ehdr), sizeof(Elf32_Ehdr));

   421 	User::LeaveIfError(tmpFile.Write(0, hdrPtr));

   422 

   423 	tmpFile.Flush();

   424 	CleanupStack::PopAndDestroy(&tmpFile);

   425 

   426 	TBuf<KMaxFileName> origFilename;

   427 	iELFFile.FullName(origFilename);

   428 	iELFFile.Close();

   429 

   430 	SwapFilesL(tmpFilename, origFilename);

   431 

   432 	//Open the file again for further use and reset data structs

   433 	User::LeaveIfError(iELFFile.Open(iFsSession, origFilename, EFileWrite));

   434 

   435 	iNewSegments.Reset();

   436 	iProgramHeaders.Close();

   437 	iProgramHeaders = newProgramHeaders;  //Update with latest p hdrs

   438 	}

   439 

   440 /**

   441  * Writes the string info at specified offset

   442  * This writes the Sym32_dhdr and the string info

   443  * @param aFile File to write to

   444  * @param aOffset Position in file to write to. This is updated and finishes at the next free point to

   445  * write to in this file

   446  * @leave One of the system wide codes

   447  * @return Offset in the file where this was written to (the initial value of aOffset)

   448  */

   449 TUint CSELFEditor::WriteStringInfoL(RFile aFile, TUint& aOffset)

   450 	{

   451 	LOG_ENTRY();

   452 

   453 	TUint writeStart = aOffset;

   454 

   455 	Sym32_dhdr dhdr;

   456 	TPtr8 dhdrPtr((TUint8*)&dhdr, sizeof(Sym32_dhdr), sizeof(Sym32_dhdr));

   457 

   458 	TInt index = iStringTable->GetIndex(KStr);

   459 	dhdr.d_name		= (index == KErrNotFound) ? ESYM_STR_UNDEF : index;

   460 	dhdr.d_descrsz	= iStringTable->GetSize();

   461 	dhdr.d_type		= ESYM_NOTE_STR;

   462 	dhdr.d_version	= iStringTable->GetIndex(KSymbianElfCoreDumpVersionV2);

   463     dhdr.d_elemnum	= 1;

   464 

   465 	//Write the dhdr

   466 	User::LeaveIfError(aFile.Write(aOffset, dhdrPtr));

   467 	aOffset += sizeof(Sym32_dhdr);

   468 

   469 	//Write the string info

   470 	TText8* buf = iStringTable->GetAllStrings();

   471 	TUint size = iStringTable->GetSize();

   472 

   473 	TPtr8 data((TUint8*)buf, size, size);

   474 	User::LeaveIfError(aFile.Write(aOffset, data));

   475 	aOffset += size;

   476 

   477 	return writeStart;

   478 	}

   479 

   480 /**

   481  * Copies the registers to aFile sensibly, updating the offsets accordingly

   482  * @param aFile Destination file

   483  * @param aSrcRead Place in src file where d_hdr starts

   484  * @param aDestWrite Destination to write to

   485  * @leave One of the system wide codes

   486  */

   487 TUint CSELFEditor::CopyRegistersL(RFile aFile, TUint aSrcRead, TUint aDestWrite, TUint& aSizeWritten)

   488 	{

   489 	LOG_ENTRY();

   490 

   491 	aSizeWritten = 0;

   492 	TUint srcpos = aSrcRead;

   493 	TUint destpos = aDestWrite;

   494 

   495 	//Write the dhdr, it wont change

   496 	READ_STRUCTL(Sym32_dhdr, dhdr, iELFFile, srcpos);

   497 	CopyFromELFFileL(srcpos, sizeof(Sym32_dhdr), aFile, destpos);

   498 	srcpos += sizeof(Sym32_dhdr);

   499 	destpos += sizeof(Sym32_dhdr);

   500 

   501 	//And the reginfod struct

   502 	READ_STRUCTL(Sym32_reginfod, reginfo, iELFFile, srcpos);

   503 	CopyFromELFFileL(srcpos, sizeof(Sym32_reginfod), aFile, destpos);

   504 	srcpos += sizeof(Sym32_reginfod);

   505 	destpos += sizeof(Sym32_reginfod);

   506 

   507 	RBuf8 regVals;

   508 	regVals.CreateL(reginfo.rid_num_registers * sizeof(TUint64));

   509 	regVals.CleanupClosePushL();

   510 

   511 	//Now we need to go through the individual register values. They are offset to somewhere and

   512 	//we need to figure out where we will be putting them first

   513 	TUint regoffset = destpos + (reginfo.rid_num_registers * sizeof(Sym32_regdatad) );

   514 	for(TUint i = 0; i < reginfo.rid_num_registers; i++)

   515 		{

   516 		READ_STRUCTL(Sym32_regdatad, regdata, iELFFile, srcpos);

   517 		srcpos += sizeof(Sym32_regdatad);

   518 

   519 		//update the offset

   520 		TUint srcOffset = regdata.rd_data;

   521 		regdata.rd_data = regoffset;

   522 		regoffset += sizeof(TUint64);

   523 

   524 		//Write it to the file

   525 		TPtr8 dataPtr((TUint8*)&regdata, sizeof(Sym32_regdatad), sizeof(Sym32_regdatad));

   526 		User::LeaveIfError(aFile.Write(destpos, dataPtr));

   527 		destpos += sizeof(Sym32_regdatad);

   528 

   529 		//Read the appropriate value

   530 		TUint32 regValue = 0;

   531 		TPtr8 regValuePtr((TUint8*)&regValue, sizeof(TUint64), sizeof(TUint64));

   532 

   533 		switch(reginfo.rid_repre)

   534 			{

   535 			case ESYM_REG_8:

   536 				User::LeaveIfError(iELFFile.Read(srcOffset, regValuePtr, sizeof(TUint8)));

   537 				break;

   538 			case ESYM_REG_16:

   539 				User::LeaveIfError(iELFFile.Read(srcOffset, regValuePtr, sizeof(TUint16)));

   540 				break;

   541 			case ESYM_REG_32:

   542 				User::LeaveIfError(iELFFile.Read(srcOffset, regValuePtr, sizeof(TUint32)));

   543 				break;

   544 			case ESYM_REG_64:

   545 				User::LeaveIfError(iELFFile.Read(srcOffset, regValuePtr, sizeof(TUint64)));

   546 				break;

   547 			default:

   548 				regValue = 0;

   549 				break;

   550 			}

   551 

   552 		regValuePtr.SetLength(sizeof(TUint64));

   553 		regVals.Append(regValuePtr);

   554 		}

   555 

   556 	//Now write the values

   557 	User::LeaveIfError(aFile.Write(destpos, regVals));

   558 	destpos += regVals.Size();

   559 

   560 	CleanupStack::PopAndDestroy(&regVals);

   561 

   562 	aSizeWritten = destpos - aDestWrite;

   563 	return aDestWrite;

   564 	}

   565 

   566 /**

   567  * Copies the variant data to aFile sensibly, updating the offsets accordingly

   568  * @param aFile Destination file

   569  * @param aSrcRead Place in src file where d_hdr starts

   570  * @param aDestWrite Destination to write to

   571  * @leave One of the system wide codes

   572  */

   573 TUint CSELFEditor::CopyVariantDataL(RFile aFile, TUint aSrcRead, TUint aDestWrite, TUint& aSizeWritten)

   574 	{

   575 	LOG_ENTRY();

   576 

   577 	aSizeWritten = 0;

   578 	TUint srcpos = aSrcRead;

   579 	TUint destpos = aDestWrite;

   580 

   581 	//Write the dhdr, it wont change

   582 	READ_STRUCTL(Sym32_dhdr, dhdr, iELFFile, srcpos);

   583 	CopyFromELFFileL(srcpos, sizeof(Sym32_dhdr), aFile, destpos);

   584 	srcpos += sizeof(Sym32_dhdr);

   585 	destpos += sizeof(Sym32_dhdr);

   586 

   587 	//And the var data struct

   588 	READ_STRUCTL(Sym32_variant_spec_data, varData, iELFFile, srcpos);

   589 	varData.es_data = destpos + sizeof(Sym32_variant_spec_data);

   590 

   591 	TPtr8 varDataPtr((TUint8*)&varData, sizeof(Sym32_variant_spec_data), sizeof(Sym32_variant_spec_data));

   592 	User::LeaveIfError(aFile.Write(destpos, varDataPtr));

   593 	srcpos += sizeof(Sym32_variant_spec_data);

   594 	destpos += sizeof(Sym32_variant_spec_data);

   595 

   596 	//And the data

   597 	CopyFromELFFileL(srcpos, varData.es_size, aFile, destpos);

   598 	srcpos += varData.es_size;

   599 	destpos += varData.es_size;

   600 

   601 	aSizeWritten = destpos - aDestWrite;

   602 	return aDestWrite;

   603 	}

   604 

   605 /**

   606  * Copies a part of the ELF file into a destination file

   607  * @param aStartPoint Point in file to start copying

   608  * @param aSize Amount to copy

   609  * @param aDestinationFile Destination file to copy to

   610  * @param aDestWrite Position in destination to write to

   611  * @return Place in file where this has been written

   612  * @leave One of the System wide codes

   613  */

   614 TUint CSELFEditor::CopyFromELFFileL(TUint aStartPoint, TUint aSize, RFile aDestinationFile, TUint aDestWrite)

   615 	{

   616 	TUint readpos = aStartPoint;

   617 	TUint endpoint = aStartPoint + aSize;

   618 	TUint destpos = aDestWrite;

   619 

   620 	//Use free memory/10 for our buffering

   621 	TInt block = 0;

   622 	TInt freemem = User::Available(block);

   623 	TInt maxfilecopysize = freemem/10;

   624 

   625 	RBuf8 copybuf;

   626 	copybuf.CreateL(maxfilecopysize);

   627 	copybuf.CleanupClosePushL();

   628 

   629 	while(readpos < endpoint)

   630 		{

   631 		TUint readsize = maxfilecopysize;

   632 		if(readpos + readsize > endpoint)

   633 			readsize = endpoint - readpos;

   634 

   635 		if(readsize != copybuf.MaxLength())

   636 			copybuf.ReAllocL(readsize);

   637 

   638 		User::LeaveIfError(iELFFile.Read(readpos, copybuf, readsize));

   639 		User::LeaveIfError(aDestinationFile.Write(destpos, copybuf));

   640 

   641 		copybuf.Zero();

   642 

   643 		destpos += readsize;

   644 		readpos += readsize;

   645 		}

   646 

   647 	CleanupStack::PopAndDestroy(&copybuf);

   648 

   649 	return aDestWrite;

   650 	}

   651 

   652 /**

   653  * Caches the string table in source ELF file into our string info table object

   654  * @leaves One of the system wide codes

   655  */

   656 void CSELFEditor::CacheStringTableL()

   657 	{

   658 	LOG_ENTRY();

   659 

   660 	for(TUint i = 0; i < iProgramHeaders.Count(); i++)

   661 		{

   662 		Elf32_Phdr phdr = iProgramHeaders[i];

   663 

   664 		READ_STRUCTL(Sym32_dhdr, dhdr, iELFFile, phdr.p_offset);

   665 		if(dhdr.d_type == ESYM_NOTE_STR)

   666 			{

   667 			iStringTableDhdr = dhdr;

   668 

   669 			RBuf8 stringData;

   670 			stringData.CreateL(dhdr.d_descrsz);

   671 			stringData.CleanupClosePushL();

   672 

   673 			User::LeaveIfError(iELFFile.Read(phdr.p_offset + sizeof(Sym32_dhdr), stringData));

   674 			iStringTable = CStringInfoTableV2::NewL(stringData);

   675 

   676 			CleanupStack::PopAndDestroy(&stringData);

   677 			return;

   678 			}

   679 		}

   680 	}

   681 

   682 /**

   683  * Utility function to leave space in the file

   684  * @param aFile

   685  * @param aSize

   686  */

   687 void CSELFEditor::PutEmptySpaceAtEndOfFileL(RFile aFile, TUint aSize)

   688 	{

   689 	LOG_ENTRY();

   690 

   691 	RBuf8 empty;

   692 	empty.CreateL(aSize);

   693 	empty.CleanupClosePushL();

   694 	empty.SetLength(aSize);

   695 

   696 	LOG_MSG2("\tPutEmptySpaceAtEndOfFileL --> Leaving [0x%X] bytes", aSize);

   697 	User::LeaveIfError(aFile.Write(empty));

   698 

   699 	CleanupStack::PopAndDestroy(&empty);

   700 	}

   701 

   702 /**

   703  * Swaps 2 files and deletes the original destination

   704  * @leave One of the system wide codes

   705  */

   706 void CSELFEditor::SwapFilesL(const TDesC& aSrc, const TDesC& aDest)

   707 	{

   708 	LOG_ENTRY();

   709 

   710 	//1. Back up the destination file in case anything fails

   711 	TBuf<KMaxFileName> backupName;

   712 	backupName.Copy(aDest);

   713 	backupName.Append(_L(".bak"));

   714 

   715 	CFileMan* fmanager = CFileMan::NewL(iFsSession);

   716 	CleanupStack::PushL(fmanager);

   717 	

   718 	User::LeaveIfError(fmanager->Rename(aDest, backupName));

   719 	

   720 	//2. Rename the src file to the dest file

   721 	TInt err = fmanager->Move(aSrc, aDest);

   722 	if(KErrNone != err)

   723 		{

   724 		//rename failed so restore original file

   725 		TPtr8 dest8((TUint8*)aDest.Ptr(), 2*aDest.Length(), 2*aDest.Length());

   726 		RDebug::Printf("\nFailed to move the tmp file so restoring original file [%S]", &dest8);

   727 		User::LeaveIfError(fmanager->Rename(backupName, aDest));

   728 		User::Leave(err);

   729 		}

   730 

   731 	//3. Delete the backup file file

   732 	User::LeaveIfError(fmanager->Delete(backupName));

   733 	CleanupStack::PopAndDestroy(fmanager);

   734 	}