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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using static ShiftOS.Objects.ShiftFS.Utils;
namespace ShiftOS.Engine
{
public static class VirusEngine
{
private static List<Virus> _infections = new List<Virus>();
public static void Add(Virus virus)
{
_infections.Add(virus);
}
public static void InfectFile(string file, string virusid)
{
string existing = "";
if(probeFile(file, out existing) == true)
{
existing = existing.Replace("<<VIRUSENGINE_HEAD>>", "").Replace("<<VIRUSENGINE_END>>", "");
existing += ";" + virusid;
existing = "<<VIRUSENGINE_HEAD>>" + existing + "<<VIRUSENGINE_END>>";
string c = ReadAllText(file);
string temp = "";
if(probeFile(file, out temp) == true)
{
c = c.Replace(temp, existing);
}
else
{
c = existing + c;
}
WriteAllText(file, c);
return;
}
else
{
existing = "<<VIRUSENGINE_HEAD>>" + virusid + "<<VIRUSENGINE_END>>";
string c = ReadAllText(file);
c = existing + c;
WriteAllText(file, c);
return;
}
}
internal static string[] FindAllVirusesInFile(string file)
{
string existing = "";
if(probeFile(file, out existing) == true)
{
existing = existing.Replace("<<VIRUSENGINE_HEAD>>", "").Replace("<<VIRUSENGINE_END>>", "");
return existing.Split(new[] { ";" }, StringSplitOptions.RemoveEmptyEntries); ;
}
else
{
return null;
}
}
private static bool probeFile(string file, out string existing)
{
int startIndex = 0;
int endIndex = 0;
bool found = false;
string contents = ReadAllText(file);
for(int i = 0; i < contents.Length; i++)
{
string end = "<<VIRUSENGINE_END>>";
try
{
if (contents.Substring(i, end.Length) == end)
{
endIndex = i + end.Length;
found = true;
break;
}
}
catch { }
}
if (found == false) {
existing = "<<VIRUSENGINE_HEAD>><<VIRUSENGINE_END>>";
}
else
{
existing = contents.Substring(startIndex, endIndex);
}
return found;
}
public static void Infect(string virusid)
{
string[] id_split = virusid.Split('.');
foreach(var v in _infections)
{
if(v.Type == id_split[0])
{
if(v.Signature == id_split[1])
{
if(v.ThreatLevel == Convert.ToInt32(id_split[2]))
{
var t = new Thread(new ThreadStart(() =>
{
v.Activate();
}));
t.IsBackground = true;
t.Start();
return;
}
}
}
}
throw new Exception("Virus not found in the system.");
}
internal static void ProbeFileRaw(string filePath, out string existing)
{
probeFile(filePath, out existing);
}
}
public abstract class Virus
{
/// <summary>
/// Inject the virus into system memory by running it.
/// </summary>
public abstract void Activate();
/// <summary>
/// Terminate the virus.
/// </summary>
public abstract void Deactivate();
public abstract int ThreatLevel { get; }
public abstract string Signature { get; }
public abstract string Type { get; }
}
}
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