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- [Core] Added new entry.

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- [Core] Fix bug with `Keys.json` reading. (#8)
- [Core] Improve file fetching.
This commit is contained in:
Razmoth
2023-08-01 01:22:15 +04:00
parent 3cf21c305a
commit f79a87b8b4
7 changed files with 112 additions and 15 deletions
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61
AssetStudio/ImportHelper.cs
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@@ -530,5 +530,66 @@ namespace AssetStudio
}
}
}
public static FileReader DecryptDreamscapeAlbireo(FileReader reader)
{
var key = new byte[] { 0x1E, 0x1E, 0x01, 0x01, 0xFC };
var signature = reader.ReadStringToNull(4);
if (signature != "MJJ")
{
reader.Position = 0;
return reader;
}
reader.Endian = EndianType.BigEndian;
var u1 = reader.ReadUInt32();
var u2 = reader.ReadUInt32();
var u3 = reader.ReadUInt32();
var u4 = reader.ReadUInt32();
var u5 = reader.ReadUInt32();
var u6 = reader.ReadUInt32();
var flag = Scrample(u4) ^ 0x70020017;
var compressedBlocksInfoSize = Scrample(u1) ^ u4;
var uncompressedBlocksInfoSize = Scrample(u6) ^ u1;
var sizeHigh = (u5 & 0xFFFFFF00 | u2 >> 24) ^ u4;
var sizeLow = (u5 >> 24 | (u2 << 8)) ^ u1;
var size = (long)(sizeHigh << 32 | sizeLow);
var blocksInfo = reader.ReadBytes((int)compressedBlocksInfoSize);
for(int i = 0; i < blocksInfo.Length; i++)
{
blocksInfo[i] ^= key[i % key.Length];
}
var data = reader.ReadBytes((int)reader.Remaining);
var buffer = (stackalloc byte[8]);
MemoryStream ms = new();
ms.Write(Encoding.UTF8.GetBytes("UnityFS\x00"));
BinaryPrimitives.WriteUInt32BigEndian(buffer, 6);
ms.Write(buffer[..4]);
ms.Write(Encoding.UTF8.GetBytes("5.x.x\x00"));
ms.Write(Encoding.UTF8.GetBytes("2018.4.2f1\x00"));
BinaryPrimitives.WriteInt64BigEndian(buffer, size);
ms.Write(buffer);
BinaryPrimitives.WriteUInt32BigEndian(buffer, compressedBlocksInfoSize);
ms.Write(buffer[..4]);
BinaryPrimitives.WriteUInt32BigEndian(buffer, uncompressedBlocksInfoSize);
ms.Write(buffer[..4]);
BinaryPrimitives.WriteUInt32BigEndian(buffer, flag);
ms.Write(buffer[..4]);
ms.Write(blocksInfo);
ms.Write(data);
reader.BaseStream.CopyTo(ms);
ms.Position = 0;
return new FileReader(reader.FullPath, ms);
static uint Scrample(uint value) => (value >> 5) & 0xFFE000 | (value >> 29) | (value << 14) & 0xFF000000 | (8 * value) & 0x1FF8;
}
}
}