bool InstructionContext::TranslateEvmFile(LPCTSTR szInFile, LPCTSTR szOutFile)
{
MemoryMappedFile mmf;
if (!mmf.MapFlie(szInFile))
{
cerr << "Cannot open evm file.\n";
return false;
}
Header* header = (Header*) mmf.data();
trace("Header codeSize = %u, dataSize = %u, initialDataSize = %u\n",
header->codeSize, header->dataSize, header->initialDataSize);
// verify
if (header->signature != SIGNATURE_ESET_VM1
|| header->dataSize < header->initialDataSize
|| header->codeSize * 3 + header->initialDataSize + 20 != mmf.size())
{
cerr << "Invalid evm file.\n";
return false;
}
Instruction* instruction = (Instruction*)(header + 1);
//section.push_back(0xCC); // Debug
vector<size_t> instructionOffsets;
instructionOffsets.resize(header->codeSize);
for (uint32_t i = 0; i < header->codeSize; ++i, ++instruction)
{
instructionOffsets[i] = section.size();
if (!AddInstruction(
instruction->Opcode,
instruction->Destination,
instruction->Source,
i,
header->dataSize))
{
return false;
}
}
// Handle jumps
for (auto it(jumps.begin()), itEnd(jumps.end()); it != itEnd; ++it)
{
for each(auto offset in it->second)
{
uint32_t* pos = (uint32_t*) §ion[offset];
size_t instructionIndex = it->first + 1;
if (instructionIndex >= instructionOffsets.size())
{
cerr << "Error: Jump address out of bounds\n";
return false;
}
*pos = instructionOffsets[instructionIndex] - sizeof(uint32_t) - offset;
}
}
return MakeExecutable(szOutFile, instruction, header->initialDataSize, header->dataSize);
}
impl(const char *path, int width, int height, int bit_count) : m_writable{ true }
{
size_t file_size = 0;
if (width < 0 || height < 0)
throw std::invalid_argument{ "invalid bitmap dimensions" };
if (bit_count != 24 && bit_count != 32)
throw std::invalid_argument{ "unsupported biBitCount" };
file_size += sizeof(BITMAPFILEHEADER);
file_size += sizeof(BITMAPINFOHEADER);
file_size += height * bitmap_row_size(width, bit_count);
m_mmap = MemoryMappedFile{ path, file_size, MemoryMappedFile::CREATE_TAG };
m_bitmap = BitmapFileData{ m_mmap.size(), m_mmap.write_ptr(), true };
m_bitmap.init(m_mmap.size(), width, height, bit_count);
}
