//! \file ArcNFS.cs //! \date Sun Nov 08 15:56:33 2015 //! \brief NA Game System resource archive. // // Copyright (C) 2015 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 System.Security.Cryptography; using GameRes.Utility; namespace GameRes.Formats.Nags { [Export(typeof(ArchiveFormat))] public class NfsOpener : ArchiveFormat { public override string Tag { get { return "NFS"; } } public override string Description { get { return "NAGS engine resource archive"; } } public override uint Signature { get { return 0; } } public override bool IsHierarchic { get { return false; } } public override bool CanWrite { get { return false; } } public override ArcFile TryOpen (ArcView file) { int count = file.View.ReadInt32 (0); if (!IsSaneCount (count)) return null; uint index_size = (uint)count * 0x20; if (index_size > file.View.Reserve (4, (uint)index_size)) return null; int first_offset = file.View.ReadInt32 (0x1C); byte key = (byte)count; first_offset ^= key | key << 8 | key << 16 | key << 24; if (first_offset != 0) return null; var index = new byte[index_size]; file.View.Read (4, index, 0, index_size); for (int i = 0; i < index.Length; ++i) index[i] ^= key; long base_offset = 4 + index_size; int index_offset = 0; var dir = new List (count); for (int i = 0; i < count; ++i) { var name = Binary.GetCString (index, index_offset, 0x18); var entry = FormatCatalog.Instance.Create (name); entry.Offset = base_offset + LittleEndian.ToUInt32 (index, index_offset+0x18); entry.Size = LittleEndian.ToUInt32 (index, index_offset+0x1C); if (!entry.CheckPlacement (file.MaxOffset)) return null; dir.Add (entry); index_offset += 0x20; } return new ArcFile (file, this, dir); } public override Stream OpenEntry (ArcFile arc, Entry entry) { var input = arc.File.CreateStream (entry.Offset, entry.Size); if (!entry.Name.EndsWith (".scb", StringComparison.InvariantCultureIgnoreCase)) return input; return new CryptoStream (input, new NotTransform(), CryptoStreamMode.Read); } } }