// convert file offset to virtual address
DWORD file_to_va(DWORD file_offset)
{
	for (int i=0; i<number_of_sections; i++)
	{
		if (file_offset >= sections[i].file_offset &&
			file_offset < sections[i].file_offset+sections[i].size)
		{
			return image_base + sections[i].rva + file_offset - sections[i].file_offset;
		}
	}
	return 0;	// bad - not found
}

// convert virtual address to file offset
DWORD va_to_file(DWORD va)
{
	for (int i=0; i<number_of_sections; i++)
	{
		if (va >= sections[i].rva+image_base &&
			va < sections[i].rva+image_base+sections[i].size)
		{
			return sections[i].file_offset+(va-(sections[i].rva+image_base));
		}
	}
	return 0;	// bad - not found
}