bool ObjIeeeAscii::GetOffset(const char *buffer, eParseType ParseType)
{
if (!file)
ThrowSyntax(buffer, ParseType);
int pos =3 ;
char ch = buffer[2];
int index = 0;
if (ch != 'G')
index = ObjUtil::FromHex(buffer, &pos);
if (buffer[pos++] != ',')
ThrowSyntax(buffer, ParseType);
ObjExpression *exp = GetExpression(buffer, &pos);
CheckTerm(buffer + pos);
switch(ch)
{
case 'G':
SetStartAddress(file, exp);
break;
case 'S':
{
ObjSection *sect = GetSection(index);
if (!sect)
ThrowSyntax(buffer, ParseType);
sect->SetSize(exp);
break;
}
case 'L':
{
ObjSection *sect = GetSection(index);
if (!sect)
ThrowSyntax(buffer, ParseType);
sect->SetOffset(exp);
break;
}
default:
{
ObjSymbol *sym = FindSymbol(ch, index);
if (!sym)
ThrowSyntax(buffer, ParseType);
sym->SetOffset(exp);
break;
}
}
return false;
}
ObjFile *CoffFile::ConvertToObject(std::string outputName, ObjFactory &factory)
{
ObjFile *fil = new ObjFile(outputName);
std::vector<ObjSection *> objectSections;
std::map<int, ObjSymbol *> externalMapping;
// Create the sections;
for (int i=0; i < header.NumberOfSections; i++)
{
if (!(sections[i].Characteristics & (IMAGE_SCN_LNK_REMOVE | IMAGE_SCN_LNK_INFO)) && strnicmp(sections[i].Name, ".debug", 6))
{
std::string sectname = GetSectionName(i);
ObjSection * sect = factory.MakeSection(sectname);
CoffSectionAux *aux = (CoffSectionAux *)& sectionSymbols[i][1];
sect->SetSize(new ObjExpression(aux->Length));
sect->SetAlignment(IMAGE_SCN_ALIGN(sections[i].Characteristics));
sect->SetQuals(GetSectionQualifiers(i));
fil->Add(sect);
objectSections.push_back(sect);
}
else
{
objectSections.push_back(NULL);
}
}
// dump comdefs
for (int i=1; i < header.NumberOfSymbols; i+= symbols[i].NumberOfAuxSymbols + 1)
{
if (symbols[i].SectionNumber > header.NumberOfSections && symbols[i].StorageClass == IMAGE_SYM_CLASS_EXTERNAL && symbols[i].Value)
{
char *sname = symbols[i].Name;
std::string symbolName;
if (*(unsigned *)sname == 0)
{
symbolName = strings + *(unsigned *)(sname + 4);
}
else
{
symbolName = symbols[i].Name;
if (symbolName.size() > 8)
symbolName = symbolName.substr(0, 8);
}
symbolName = std::string("vsb") + symbolName;
ObjSection * sect = factory.MakeSection(symbolName);
sect->SetSize(new ObjExpression(symbols[i].Value));
sect->SetAlignment(8);
sect->SetQuals(ObjSection::ram | ObjSection::max | ObjSection::virt);
fil->Add(sect);
objectSections.push_back(sect);
}
}
// create the symbols
for (int i=0; i < header.NumberOfSymbols; i+= symbols[i].NumberOfAuxSymbols + 1)
{
if (symbols[i].StorageClass == IMAGE_SYM_CLASS_EXTERNAL && symbols[i].SectionNumber <= header.NumberOfSections)
{
if (symbols[i].SectionNumber <= 0 || (((CoffSectionAux *)§ionSymbols[symbols[i].SectionNumber-1][1])->Selection <= 1))
{
char *sname = symbols[i].Name;
std::string symbolName;
if (*(unsigned *)sname == 0)
{
symbolName = strings + *(unsigned *)(sname + 4);
if (symbolName == "_WinMain@16")
symbolName = "WinMain";
}
else
{
symbolName = symbols[i].Name;
if (symbolName.size() > 8)
symbolName = symbolName.substr(0, 8);
}
if (symbols[i].SectionNumber == -1)
{
ObjSymbol *symbol = factory.MakePublicSymbol(symbolName);
ObjExpression *exp = new ObjExpression(symbols[i].Value);
symbol->SetOffset(exp);
fil->Add(symbol);
}
else if (symbols[i].SectionNumber)
{
ObjSymbol *symbol = factory.MakePublicSymbol(symbolName);
ObjExpression *exp = new ObjExpression(ObjExpression::eAdd, new ObjExpression(objectSections[symbols[i].SectionNumber-1]), new ObjExpression(symbols[i].Value));
symbol->SetOffset(exp);
fil->Add(symbol);
}
else
{
ObjSymbol *symbol = factory.MakeExternalSymbol(symbolName);
externalMapping[i] = symbol;
fil->Add(symbol);
}
}
}
}
// dump data to the sections
for (int i=0; i < header.NumberOfSections; i++)
{
if (objectSections[i])
{
int len = sections[i].SizeOfRawData;
if (len)
{
inputFile->seekg(sections[i].PointerToRawData + libOffset);
int relocCount = sections[i].NumberOfRelocations;
CoffReloc * relocPointer = relocs[i];
if (relocCount == 0xffff && (sections[i].Characteristics & IMAGE_SCN_LNK_NRELOC_OVFL))
{
relocCount = relocPointer[0].VirtualAddress;
relocPointer++;
}
unsigned offset = 0;
inputFile->clear();
while (offset < sections[i].SizeOfRawData)
{
if (!relocCount)
{
ObjByte *data = new ObjByte[sections[i].SizeOfRawData-offset];
inputFile->read((char *)data, sections[i].SizeOfRawData-offset);
if (inputFile->fail())
{
return NULL;
}
ObjMemory *newMem = new ObjMemory(data, sections[i].SizeOfRawData-offset);
objectSections[i]->Add(newMem);
offset = sections[i].SizeOfRawData;
}
else
{
unsigned fixupOffset;
int n = relocPointer->VirtualAddress - offset;
if (n)
{
ObjByte *data = new ObjByte[n];
inputFile->read((char *)data, n);
if (inputFile->fail())
{
return NULL;
}
ObjMemory *newMem = new ObjMemory(data, n);
objectSections[i]->Add(newMem);
}
inputFile->read((char *)&fixupOffset, sizeof(unsigned));
if (inputFile->fail())
{
return NULL;
}
switch (relocPointer->Type)
{
ObjExpression *fixupExpr;
case IMAGE_REL_I386_DIR32:
case IMAGE_REL_I386_REL32:
if (symbols[relocPointer->SymbolTableIndex].StorageClass == IMAGE_SYM_CLASS_EXTERNAL)
{
if (symbols[relocPointer->SymbolTableIndex].SectionNumber == 0)
{
// external
fixupExpr = new ObjExpression(externalMapping[relocPointer->SymbolTableIndex]);
}
else if (symbols[relocPointer->SymbolTableIndex].SectionNumber > header.NumberOfSections)
{
fixupExpr = new ObjExpression(ObjExpression::eAdd, new ObjExpression(objectSections[symbols[relocPointer->SymbolTableIndex].SectionNumber-1]), new ObjExpression(0));
}
else
{
// public
fixupExpr = new ObjExpression(ObjExpression::eAdd, new ObjExpression(objectSections[symbols[relocPointer->SymbolTableIndex].SectionNumber-1]), new ObjExpression(symbols[relocPointer->SymbolTableIndex].Value));
}
}
else
{
// local static
fixupExpr = new ObjExpression(ObjExpression::eAdd, new ObjExpression(objectSections[symbols[relocPointer->SymbolTableIndex].SectionNumber-1]), new ObjExpression(symbols[relocPointer->SymbolTableIndex].Value));
}
if (relocPointer->Type == IMAGE_REL_I386_REL32)
{
fixupExpr = new ObjExpression(ObjExpression::eAdd, fixupExpr, new ObjExpression(fixupOffset - 4));
fixupExpr = new ObjExpression(ObjExpression::eSub, fixupExpr, new ObjExpression(ObjExpression::ePC) );
}
else if (fixupOffset)
{
fixupExpr = new ObjExpression(ObjExpression::eAdd, fixupExpr, new ObjExpression(fixupOffset));
}
objectSections[i]->Add(new ObjMemory(fixupExpr, 4));
break;
default:
std::cout << "Invalid relocation" << std::endl;
return NULL;
}
offset += n + 4;
relocPointer++;
relocCount--;
}
}
}
}
}
for (int i=1; i < header.NumberOfSymbols; i+= symbols[i].NumberOfAuxSymbols + 1)
{
if (symbols[i].SectionNumber > header.NumberOfSections && symbols[i].StorageClass == IMAGE_SYM_CLASS_EXTERNAL && symbols[i].Value)
{
int n = symbols[i].SectionNumber-1;
ObjByte *data = new ObjByte[symbols[i].Value];
memset(data,0, symbols[i].Value);
ObjMemory *newMem = new ObjMemory(data, symbols[i].Value);
objectSections[n]->Add(newMem);
}
}
return fil;
}
