private static string ReadEncryptedString(BinaryReader br, RgssDecryptionKey key)
{
int dataLenght = ReadEncryptedInt(br, key);
var bytes = br.ReadBytes(dataLenght);
return(DecryptString(bytes, key));
}
private static int DecryptInt(int input, RgssDecryptionKey key)
{
var dec = (int)(input ^ key.Current());
key.Step();
return(dec);
}
public RgssFileStream(RgssFilePointer fp)
{
_fileStream = File.OpenRead(fp.Source.DataPath);
_decKey = new RgssDecryptionKey(7, 3);
_decKey.PushState(fp.Key);
_fileRange = new RangeStream(_fileStream, fp.Offset, fp.Size);
}
private static string DecryptString(byte[] input, RgssDecryptionKey key)
{
byte[] decBytes = new byte[input.Length];
for (int i = 0; i < decBytes.Length; i++)
{
decBytes[i] = (byte)(input[i] ^ (key.Current() & 0xFF));
key.Step();
}
return(Encoding.UTF8.GetString(decBytes));
}
private static string DecryptString(byte[] input, RgssDecryptionKey key)
{
byte[] decBytes = new byte[input.Length];
var j = 0;
for (var i = 0; i < decBytes.Length; i++)
{
decBytes[i] = (byte)(input[i] ^ ((key.Current() >> 8 * j) & 0xFF));
j += 1;
j %= 4;
}
return(Encoding.UTF8.GetString(decBytes));
}
public RgssArchiveV3(string path) : base(path)
{
using (var fs = File.OpenRead(path))
{
switch (CheckVersion(path, 3))
{
case -1:
throw new InvalidDataException("Invalid RGSS Data");
case 0:
throw new InvalidDataException("Invalid RGSSAD Version");
case 1:
default:
break;
}
using (var br = new BinaryReader(fs))
{
fs.Position = 8;
var dKey = new RgssDecryptionKey(9, 3);
dKey.PushState(br.ReadUInt32());
dKey.Step();
while (true)
{
var fp = new RgssFilePointer();
fp.Offset = ReadEncryptedInt(br, dKey);
if (fp.Offset == 0)
{
break;
}
fp.Source = this;
fp.Size = ReadEncryptedInt(br, dKey);
fp.Key = (uint)ReadEncryptedInt(br, dKey);
fp.Name = ReadEncryptedString(br, dKey);
FilePointers.Add(fp);
}
}
}
}
public RgssArchiveV1(string path) : base(path)
{
using (var fs = File.OpenRead(path))
{
switch (CheckVersion(path, 1))
{
case -1:
throw new InvalidDataException("Invalid RGSS Data");
case 0:
throw new InvalidDataException("Invalid RGSSAD Version");
case 1:
default:
break;
}
using (var br = new BinaryReader(fs))
{
fs.Position = 8;
var dKey = new RgssDecryptionKey(7, 3);
dKey.PushState(0xDEADCAFE);
while (fs.Length - fs.Position > 0)
{
var fp = new RgssFilePointer();
fp.Source = this;
fp.Name = ReadEncryptedString(br, dKey);
fp.Size = ReadEncryptedInt(br, dKey);
fp.Offset = fs.Position;
fp.Key = dKey.Current();
fs.Position += fp.Size;
FilePointers.Add(fp);
}
}
}
}
private static int ReadEncryptedInt(BinaryReader br, RgssDecryptionKey key)
{
return(DecryptInt(br.ReadInt32(), key));
}
private static int DecryptInt(int input, RgssDecryptionKey key)
{
return((int)(input ^ key.Current()));
}