//! \file ArcDAT.cs //! \date 2019 Feb 26 //! \brief Unity PMaster engine resource archive. // // Copyright (C) 2019 by morkt // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to // deal in the Software without restriction, including without limitation the // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or // sell copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS // IN THE SOFTWARE. // using System; using System.Collections.Generic; using System.ComponentModel.Composition; using System.IO; using GameRes.Utility; namespace GameRes.Formats.Unity.PMaster { internal class PMasterEntry : Entry { public uint Key; } [Export(typeof(ArchiveFormat))] public class DatOpener : ArchiveFormat { public override string Tag { get { return "DAT/PMASTER"; } } public override string Description { get { return "Unity PMaster engine resource archive"; } } public override uint Signature { get { return 0; } } public override bool IsHierarchic { get { return true; } } public override bool CanWrite { get { return false; } } public override ArcFile TryOpen (ArcView file) { int count = 0; for (int i = 0; i < 0x400; i += 4) count += file.View.ReadInt32 (i); if (!IsSaneCount (count)) return null; uint index_length = (uint)count * 0x10; if (index_length >= file.MaxOffset) return null; var index = file.View.ReadBytes (0x400, index_length); DecryptData (index, file.View.ReadUInt32 (0xD4)); uint first_offset = index.ToUInt32 (4); if (first_offset >= file.MaxOffset || first_offset <= (0x400 + index_length)) return null; uint names_length = first_offset - (0x400 + index_length); var names = file.View.ReadBytes (0x400 + index_length, names_length); DecryptData (names, file.View.ReadUInt32 (0x5C)); int index_pos = 0; var dir = new List<Entry> (count); for (int i = 0; i < count; ++i) { int name_pos = index.ToInt32 (index_pos); var name = Binary.GetCString (names, name_pos); var entry = Create<PMasterEntry> (name); entry.Offset = index.ToUInt32 (index_pos+4); entry.Size = index.ToUInt32 (index_pos+8); entry.Key = index.ToUInt32 (index_pos+12); if (!entry.CheckPlacement (file.MaxOffset)) return null; dir.Add (entry); index_pos += 16; } return new ArcFile (file, this, dir); } public override Stream OpenEntry (ArcFile arc, Entry entry) { var pent = (PMasterEntry)entry; var data = arc.File.View.ReadBytes (entry.Offset, entry.Size); DecryptData (data, pent.Key); return new BinMemoryStream (data, entry.Name); } void DecryptData (byte[] data, uint seed) { var key = GenerateKey (seed); for (int i = 0; i < data.Length; i++) { byte b = data[i]; b ^= key[i & 0xFF]; b += 0x4D; b += key[i % 0x2B]; b -= key[i & 0xFF]; b ^= 0x23; data[i] = b; } } byte[] GenerateKey (uint seed) { var key = new byte[256]; uint n = seed * 2281 + 59455; uint n2 = (n << 17) ^ n; for (int i = 0; i < 256; i++) { n >>= 5; n ^= n2; n *= 471; n -= seed; n += n2; n2 = n + 87; n ^= n2 & 91; key[i] = (byte)n; n >>= 1; } return key; } } }