bintools/petools/pefile/pe_imp.cpp
author jjkang
Fri, 25 Jun 2010 18:11:34 +0800
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// Copyright (c) 1996-2009 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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#include <stdlib.h>
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#include <string.h>
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#include <e32std.h>
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#include <e32std_private.h>
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#include "h_utl.h"
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#include "pe_file.h"
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TInt E32ImageFile_PE::CopyImportAddrTable(char *aPtr, PEFile &aPeFile)
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//
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// Copy the import address table entries
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//
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	{
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	TUint *ptr=(TUint *)aPtr;
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	char *importsection=aPeFile.iSectionData[KImportSection];
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	TUint *src=(TUint *)importsection;
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	while (*src)
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		{
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		TUint vaoffset=src[4];
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		if (!gLittleEndian) ByteSwap(vaoffset);
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		TUint offset=vaoffset-aPeFile.iSectionHeader[KImportSection]->VirtualAddress; // find the offset into the section of import addr table
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		vaoffset=src[3];
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		if (!gLittleEndian) ByteSwap(vaoffset);
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		TUint exportername=vaoffset-aPeFile.iSectionHeader[KImportSection]->VirtualAddress;
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		TUint *p=(TUint *)(importsection+offset);
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		while (*p)
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			{
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			if ((*p&0x80000000)==0)
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				{
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				Print(EError, "%s exporting symbol by name\n", importsection+exportername);
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				return KErrGeneral;
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				}
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			*ptr++=(*p++)&0x7fffffff; // mask out the high bit (- indicates export by ordinal)
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			}
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		src+=5;
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		}
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	*ptr++=0;
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	return KErrNone;
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	}
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extern char* gX86imp;
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extern int gX86num_imports;
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extern int gX86num_imp_dlls;
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extern int gX86imp_size;
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int* gX86imp_relocs=NULL;
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TInt CrunchImportSection(TAny* aSection, TInt aNumImpDlls, TInt aNumImports)
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	{
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	// Remove lists of ordinals from import section
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	TInt* d = (TInt*)aSection;
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	TInt orig_size = *d;
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	TInt offset_correction = aNumImports*sizeof(TUint);
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	*d -= offset_correction;	// reduce total section size
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	TInt *dd = d+1;
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	TInt *ss = d+1;
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	TInt i;
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	for (i=0; i<aNumImpDlls; ++i)
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		{
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		*dd++ = *ss++ - offset_correction;	// copy name offset and reduce it appropriately
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		TInt nimp = *ss++;					// number of imports from this DLL
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		*dd++ = nimp;						// copy it
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		ss += nimp;							// skip the ordinals in the original list
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		}
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	TInt used_size = (ss - d) * sizeof(TInt);
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	memcpy(dd, ss, orig_size - used_size);	// copy name strings
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	return *d;	// return new total section size
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	}
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char *E32ImageFile_PE::CreateImportSection(const PEFile &aPeFile, TInt &aSize)
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//
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// Create a new format import section
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//
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	{
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	int total_imports = 0;
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	if (gX86imp)
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		{
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		TUint *rdata=(TUint*)aPeFile.iSectionData[KConstSection];
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		TInt bytecount=gX86imp_size;
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		char* section=new char[bytecount];
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		memcpy(section,gX86imp,bytecount);
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		int i;
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		int j=0;
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		int* s=(int*)section;
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		s++;
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		gX86imp_relocs=new int[gX86num_imports+gX86num_imp_dlls];
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		for (i=0; i<gX86num_imp_dlls; ++i)
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			{
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			++s;
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			int n=*s++;
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			total_imports += n;
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			while (n--)
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				{
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				int rdata_int_offset=*s>>2;
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				*s=rdata[rdata_int_offset]&0x7fffffffu;	// rdata offset to ordinal
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				gX86imp_relocs[rdata_int_offset]=j<<2;
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				++j;
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				++s;
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				}
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			}
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		*(TInt*)section = bytecount;
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		aSize = CrunchImportSection(section, gX86num_imp_dlls, total_imports);
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		return section;
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		}
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	PIMAGE_SECTION_HEADER aHeader=aPeFile.iSectionHeader[KImportSection];
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	TUint *aSrc=(TUint *)aPeFile.iSectionData[KImportSection];
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	TInt nimportdlls=aPeFile.NumberOfImportDlls();
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	if (nimportdlls==0)
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		{
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		aSize=0;
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		return NULL;
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		}
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	E32ImportBlock *block=new E32ImportBlock [nimportdlls];
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	char **name=new char* [nimportdlls];
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	TUint **import=new TUint* [nimportdlls];
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	TInt bytecount=sizeof(E32ImportSection)+sizeof(E32ImportBlock)*nimportdlls;
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	TUint *src=aSrc;
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	TInt i;
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	for (i=0; i<nimportdlls; i++)
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		{
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		TUint vaoffset=src[4];
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		if (!gLittleEndian) ByteSwap(vaoffset);
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		TUint offset=vaoffset-aHeader->VirtualAddress; // find the offset into the section of import addr table
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		TUint *p=aSrc+offset/4;
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		block[i].iNumberOfImports=0;
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		while (*p++)
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			block[i].iNumberOfImports++;
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		total_imports += block[i].iNumberOfImports;
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		import[i]=new TUint [block[i].iNumberOfImports];
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		TInt j;
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		p=aSrc+offset/4;
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		for (j=0; j<block[i].iNumberOfImports; j++)
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			{
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			import[i][j]=(*p++)&0x7fffffffu;
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			bytecount+=4;
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			}
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		// name
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		vaoffset=src[3];
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		if (!gLittleEndian) ByteSwap(vaoffset);
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		offset=vaoffset-aHeader->VirtualAddress;
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		name[i]=((char *)aSrc)+offset;
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		bytecount+=strlen(name[i])+1;
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		src+=5;
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		}
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	bytecount=ALIGN4(bytecount);
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	char *section=new char [bytecount];
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	char *s=section+sizeof(E32ImportSection);
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	for (i=0; i<nimportdlls; i++)
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		{
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		memcpy(s, (char *)&block[i], sizeof(E32ImportBlock));
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		s+=sizeof(E32ImportBlock);
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		memcpy(s, (char *)import[i], block[i].iNumberOfImports*4);
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		s+=block[i].iNumberOfImports*4;
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		}
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	char *t=section+sizeof(E32ImportSection);
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	for (i=0; i<nimportdlls; i++)
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		{
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		((E32ImportBlock *)t)->iOffsetOfDllName=s-section;
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		strcpy(s, name[i]);
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		s+=strlen(name[i])+1;
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		t += ((E32ImportBlock *)t)->iNumberOfImports * sizeof(TUint) + sizeof(E32ImportBlock);
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		}
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	while ((s-section)<bytecount)
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		*s++=0;
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	// free mem
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	for (i=0; i<nimportdlls; i++)
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		delete import[i];
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	delete block;
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	delete import;
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	delete name;
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	*(TInt*)section = bytecount;
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	aSize = CrunchImportSection(section, nimportdlls, total_imports);
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	return section;
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	}
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TUint E32ImageFile_PE::FixImportThunk(PEFile &aPeFile, TUint va)
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//
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// Fix an access to the import address table
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//
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	{
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	TUint *imports=(TUint *)aPeFile.iSectionData[KImportSection];
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	TUint n=0;
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	TUint importoffset=imports[4];
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	if (!gLittleEndian) ByteSwap(importoffset);
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	TUint iat=importoffset-aPeFile.iSectionHeader[KImportSection]->VirtualAddress;
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	while (iat<va)
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		{
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		if (*((TUint *)(aPeFile.iSectionData[KImportSection]+iat))==0)
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			{
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			imports+=5;
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			importoffset=imports[4];
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			if (!gLittleEndian) ByteSwap(importoffset);
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			iat=importoffset-aPeFile.iSectionHeader[KImportSection]->VirtualAddress;
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			}
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		else
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			{
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			n++;
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			iat+=4;
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			}
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		}
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	// Flag errors brought about by a corrupt input binary
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	if (iat>va)
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		{
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		Print(EError, "%s is corrupt - problem processing import address table.\n", this->iFileName);
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		return (TUint)KErrGeneral;
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		}
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	return iHdr->iTextSize+n*sizeof(TUint);
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	}
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