//=====================================================
// Calculate map hash(reversed) and dump map signature(if any)
// - return the starting pos of signature block(-1 if none)
//=====================================================
public static long MapGetSignatureInfo(string mappath, ref byte[] maphash, ref byte[] mapsignature)
{
long signature_pos = -1;
string mapname = Path.GetFileName(mappath);
byte[] mapnamebytes = Encoding.ASCII.GetBytes(mapname.ToUpper()); //upper filename
System.Security.Cryptography.SHA1 sha1 = System.Security.Cryptography.SHA1.Create();
Stream input = File.OpenRead(mappath);
byte[] buffer_old = new byte[200];
byte[] buffer = new byte[200]; //read 200 bytes each time
int bytesRead, bytesRead_old;
bool findblockheader = false;
//Mpq is a vaild map
bytesRead = input.Read(buffer, 0, buffer.Length); //read mpq header
if (buffer[0] == Convert.ToByte('H') && buffer[1] == Convert.ToByte('M') && buffer[2] == Convert.ToByte('3') && buffer[3] == Convert.ToByte('W'))
{
//sha1.TransformBlock(buffer, 0, buffer.Length, null, 0);
Array.Copy(buffer, buffer_old, buffer.Length);
bytesRead_old = bytesRead;
}
else
{
throw new Exception("Not a vaild map.");
}
while ((bytesRead = input.Read(buffer, 0, buffer.Length)) > 0)
{
//Construct a new temporiary bytes of 2 trunks, in case the header sign is splited.
byte[] temp = new byte[buffer_old.Length + buffer.Length];
Array.Copy(buffer_old, 0, temp, 0, buffer_old.Length);
Array.Copy(buffer, 0, temp, buffer_old.Length, buffer.Length);
//search for the block header 'NGIS'
int index;
if ((index = IndexOfBytes(temp, SIGNATURE_HEADER)) != -1)
{
//if found!
Console.WriteLine("Found Signature.");
sha1.TransformBlock(temp, 0, index, null, 0);
findblockheader = true;
//dump signature
input.Position = input.Position - temp.Length + index + SIGNATURE_HEADER.Length; //set the stream pos after 'NGIS'
signature_pos = input.Position - SIGNATURE_HEADER.Length; //get the signature block starting pos
mapsignature = new byte[input.Length - input.Position];
input.Read(mapsignature, 0, mapsignature.Length);
Array.Reverse(mapsignature);
break;
}
else
{
sha1.TransformBlock(buffer_old, 0, bytesRead_old, null, 0);
Array.Copy(buffer, buffer_old, buffer.Length);
bytesRead_old = bytesRead;
}
}
if (!findblockheader)
{
sha1.TransformBlock(buffer_old, 0, bytesRead_old, null, 0);
}
sha1.TransformBlock(mapnamebytes, 0, mapnamebytes.Length, null, 0); //Add upper file name to the end
sha1.TransformFinalBlock(buffer, 0, 0);
//Calculate Hash:
Console.WriteLine("SHA1:");
maphash = new byte[sha1.Hash.Length];
sha1.Hash.CopyTo(maphash, 0);
input.Close();
input.Dispose();
Array.Reverse(maphash);
Console.WriteLine(BitConverter.ToString(maphash));
return(signature_pos);
}
