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91 lines
3.6 KiB
C#
91 lines
3.6 KiB
C#
//! \file ArcNFS.cs
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//! \date Sun Nov 08 15:56:33 2015
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//! \brief NA Game System resource archive.
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//
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// Copyright (C) 2015 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.IO;
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using System.Security.Cryptography;
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using GameRes.Utility;
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namespace GameRes.Formats.Nags
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{
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[Export(typeof(ArchiveFormat))]
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public class NfsOpener : ArchiveFormat
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{
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public override string Tag { get { return "NFS"; } }
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public override string Description { get { return "NAGS engine resource archive"; } }
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public override uint Signature { get { return 0; } }
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public override bool IsHierarchic { get { return false; } }
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public override bool CanWrite { get { return false; } }
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public override ArcFile TryOpen (ArcView file)
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{
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int count = file.View.ReadInt32 (0);
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if (!IsSaneCount (count))
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return null;
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uint index_size = (uint)count * 0x20;
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if (index_size > file.View.Reserve (4, (uint)index_size))
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return null;
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int first_offset = file.View.ReadInt32 (0x1C);
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byte key = (byte)count;
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first_offset ^= key | key << 8 | key << 16 | key << 24;
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if (first_offset != 0)
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return null;
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var index = file.View.ReadBytes (4, index_size);
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for (int i = 0; i < index.Length; ++i)
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index[i] ^= key;
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long base_offset = 4 + index_size;
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int index_offset = 0;
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var dir = new List<Entry> (count);
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for (int i = 0; i < count; ++i)
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{
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var name = Binary.GetCString (index, index_offset, 0x18);
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if (0 == name.Length)
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return null;
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var entry = FormatCatalog.Instance.Create<Entry> (name);
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entry.Offset = base_offset + LittleEndian.ToUInt32 (index, index_offset+0x18);
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entry.Size = LittleEndian.ToUInt32 (index, index_offset+0x1C);
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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dir.Add (entry);
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index_offset += 0x20;
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}
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return new ArcFile (file, this, dir);
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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var input = arc.File.CreateStream (entry.Offset, entry.Size);
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if (!entry.Name.HasExtension (".scb"))
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return input;
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return new InputCryptoStream (input, new NotTransform());
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}
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}
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}
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