public byte[] Decipher(byte[] data, bool compressed)
{
int length = (data.Length - 4) / 8;
byte[] enc = new byte[length * 8];
for (int i = 0; i < length; i++)
{
int os1 = (i * 8) + 4;
int os2 = i * 8;
Buffer.BlockCopy(data, os1, enc, os2, 8);
}
enc = Utility.byteSwap(enc);
enc = blowfish.Decrypt_ECB(enc);
enc = Utility.byteSwap(enc);
Buffer.BlockCopy(enc, 0, data, 4, enc.Length);
if (compressed)
{
byte[] xor = Utility.xor(Utility.dStrip(data));
xor = PRS.Decompress(xor);
xor = Utility.dReplace(data, xor);
return(xor);
}
return(data);
}
internal static byte[] DecompressPRC(byte[] data, bool big_endian)
{
ByteArray ba = new ByteArray(data);
if (big_endian)
{
ba.Endianess = Endianess.BigEndian;
}
int size = ba.ReadI32();
uint key = ba.ReadU32();
byte[] result = new byte[(int)((ba.Length - 8 + 3) & 0xFFFFFFFC)];
ba.Read(result, 0, ba.Length - 8);
PRC prc = new PRC(key);
prc.CryptData(result, 0, result.Length, big_endian);
Array.Resize(ref result, size);
result = PRS.Decompress(result);
return(result);
}
/* To simplify the process greatly, we are going to convert
* the Storybook Archive to a new format */
public override MemoryStream TranslateData(ref Stream stream)
{
try
{
/* Get the number of files */
uint files = stream.ReadUInt(0x0).SwapEndian();
/* Now create the header */
MemoryStream data = new MemoryStream();
data.Write(files);
/* Write each file in the header */
uint offset = 0xC + (files * 0x2C);
for (int i = 0; i < files; i++)
{
uint length = stream.ReadUInt(0x3C + (i * 0x30)).SwapEndian();
data.Write(offset); // Offset
data.Write(length); // Length
data.Write(stream.ReadString(0x10 + (i * 0x30), 36), 36); // Filename
/* Let's write the decompressed data */
uint sourceOffset = stream.ReadUInt(0x34 + (i * 0x30)).SwapEndian();
uint sourceLength = stream.ReadUInt(0x38 + (i * 0x30)).SwapEndian();
Stream compressedData = stream.Copy(sourceOffset, sourceLength);
/* Decompress the data */
PRS decompressor = new PRS();
MemoryStream decompressedData = decompressor.Decompress(ref compressedData, length);
if (decompressedData == null)
throw new Exception();
/* Write the data */
data.Position = offset;
data.Write(decompressedData);
data.Position = 0x30 + (i * 0x2C);
decompressedData.Close();
offset += length;
}
return data;
}
catch
{
return new MemoryStream();
}
}
