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324 lines
11 KiB
C#
324 lines
11 KiB
C#
//! \file ArcNPK.cs
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//! \date Sat Feb 06 06:07:52 2016
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//! \brief Mware resource archive.
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//
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// Copyright (C) 2016 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.IO.Compression;
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using System.Linq;
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using System.Security.Cryptography;
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namespace GameRes.Formats.NitroPlus
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{
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internal class NpkEntry : PackedEntry
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{
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public readonly List<NpkSegment> Segments = new List<NpkSegment>();
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}
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internal class NpkSegment
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{
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public long Offset;
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public uint AlignedSize;
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public uint Size;
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public uint UnpackedSize;
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public bool IsCompressed;
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}
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internal class NpkArchive : ArcFile
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{
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public readonly Aes Encryption;
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public NpkArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, Aes enc)
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: base (arc, impl, dir)
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{
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Encryption = enc;
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}
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#region IDisposable Members
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bool _npk_disposed = false;
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protected override void Dispose (bool disposing)
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{
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if (_npk_disposed)
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return;
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if (disposing)
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Encryption.Dispose();
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_npk_disposed = true;
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base.Dispose (disposing);
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}
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#endregion
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}
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[Export(typeof(ArchiveFormat))]
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public class NpkOpener : ArchiveFormat
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{
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public override string Tag { get { return "NPK"; } }
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public override string Description { get { return "Mware engine resource archive"; } }
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public override uint Signature { get { return 0x324B504E; } } // 'NPK2'
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public override bool IsHierarchic { get { return true; } }
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public override bool CanCreate { get { return false; } }
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public static Dictionary<string, byte[]> KnownKeys = new Dictionary<string, byte[]>();
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public override ResourceScheme Scheme
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{
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get { return new Npk2Scheme { KnownKeys = KnownKeys }; }
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set { KnownKeys = ((Npk2Scheme)value).KnownKeys; }
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}
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public override ArcFile TryOpen (ArcView file)
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{
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int count = file.View.ReadInt32 (0x18);
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if (!IsSaneCount (count))
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return null;
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var key = QueryEncryption();
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if (null == key)
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return null;
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var aes = Aes.Create();
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try
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{
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aes.Mode = CipherMode.CBC;
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aes.Padding = PaddingMode.PKCS7;
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aes.Key = key;
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aes.IV = file.View.ReadBytes (8, 0x10);
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uint index_size = file.View.ReadUInt32 (0x1C);
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using (var decryptor = aes.CreateDecryptor())
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using (var enc_index = file.CreateStream (0x20, index_size))
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using (var dec_index = new CryptoStream (enc_index, decryptor, CryptoStreamMode.Read))
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using (var index = new ArcView.Reader (dec_index))
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{
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var dir = ReadIndex (index, count, file.MaxOffset);
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if (null == dir)
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return null;
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var arc = new NpkArchive (file, this, dir, aes);
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aes = null; // object ownership passed to NpkArchive, don't dispose
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return arc;
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}
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}
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finally
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{
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if (aes != null)
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aes.Dispose();
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}
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}
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List<Entry> ReadIndex (BinaryReader index, int count, long max_offset)
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{
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var name_buffer = new byte[0x80];
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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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index.ReadByte();
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int name_length = index.ReadUInt16();
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if (name_length > name_buffer.Length)
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name_buffer = new byte[name_length];
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index.Read (name_buffer, 0, name_length);
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var name = Encodings.cp932.GetString (name_buffer, 0, name_length);
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var entry = FormatCatalog.Instance.Create<NpkEntry> (name);
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entry.UnpackedSize = index.ReadUInt32();
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index.Read (name_buffer, 0, 0x20); // skip
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int segment_count = index.ReadInt32();
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if (segment_count <= 0)
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return null;
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entry.Segments.Capacity = segment_count;
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uint packed_size = 0;
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bool is_packed = false;
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for (int j = 0; j < segment_count; ++j)
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{
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var segment = new NpkSegment();
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segment.Offset = index.ReadInt64();
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segment.AlignedSize = index.ReadUInt32();
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segment.Size = index.ReadUInt32();
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segment.UnpackedSize = index.ReadUInt32();
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segment.IsCompressed = segment.Size < segment.UnpackedSize;
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entry.Segments.Add (segment);
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packed_size += segment.AlignedSize;
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is_packed = is_packed || segment.IsCompressed;
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}
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entry.Offset = entry.Segments[0].Offset;
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entry.Size = packed_size;
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entry.IsPacked = is_packed;
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if (!entry.CheckPlacement (max_offset))
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return null;
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dir.Add (entry);
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}
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return 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 narc = arc as NpkArchive;
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var nent = entry as NpkEntry;
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if (null == narc || null == nent)
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return base.OpenEntry (arc, entry);
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if (1 == nent.Segments.Count && !nent.IsPacked)
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{
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var input = narc.File.CreateStream (nent.Segments[0].Offset, nent.Segments[0].AlignedSize);
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var decryptor = narc.Encryption.CreateDecryptor();
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return new CryptoStream (input, decryptor, CryptoStreamMode.Read);
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}
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return new NpkStream (narc, nent);
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}
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byte[] QueryEncryption ()
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{
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if (0 == KnownKeys.Count)
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return null;
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return KnownKeys.Values.First();
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}
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}
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internal class NpkStream : Stream
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{
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ArcView m_file;
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Aes m_encryption;
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IEnumerator<NpkSegment> m_segment;
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Stream m_stream;
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bool m_eof = false;
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public override bool CanRead { get { return m_stream != null && m_stream.CanRead; } }
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public override bool CanSeek { get { return false; } }
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public override bool CanWrite { get { return false; } }
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public NpkStream (NpkArchive arc, NpkEntry entry)
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{
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m_file = arc.File;
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m_encryption = arc.Encryption;
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m_segment = entry.Segments.GetEnumerator();
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NextSegment();
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}
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private void NextSegment ()
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{
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if (!m_segment.MoveNext())
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{
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m_eof = true;
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return;
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}
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if (null != m_stream)
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m_stream.Dispose();
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var segment = m_segment.Current;
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m_stream = m_file.CreateStream (segment.Offset, segment.AlignedSize);
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var decryptor = m_encryption.CreateDecryptor();
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m_stream = new CryptoStream (m_stream, decryptor, CryptoStreamMode.Read);
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if (segment.IsCompressed)
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m_stream = new DeflateStream (m_stream, CompressionMode.Decompress);
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}
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public override int Read (byte[] buffer, int offset, int count)
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{
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int total = 0;
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while (!m_eof && count > 0)
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{
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int read = m_stream.Read (buffer, offset, count);
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if (0 != read)
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{
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total += read;
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offset += read;
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count -= read;
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}
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if (0 != count)
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NextSegment();
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}
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return total;
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}
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public override int ReadByte ()
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{
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int b = -1;
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while (!m_eof)
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{
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b = m_stream.ReadByte();
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if (-1 != b)
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break;
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NextSegment();
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}
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return b;
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}
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#region IO.Stream members
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public override long Length
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{
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get { throw new NotSupportedException ("NpkStream.Length not supported"); }
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}
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public override long Position
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{
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get { throw new NotSupportedException ("NpkStream.Position not supported."); }
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set { throw new NotSupportedException ("NpkStream.Position not supported."); }
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}
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public override void Flush ()
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{
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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throw new NotSupportedException ("NpkStream.Seek method is not supported");
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}
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public override void SetLength (long length)
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{
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throw new NotSupportedException ("NpkStream.SetLength method is not supported");
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}
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public override void Write (byte[] buffer, int offset, int count)
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{
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throw new NotSupportedException ("NpkStream.Write method is not supported");
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}
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public override void WriteByte (byte value)
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{
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throw new NotSupportedException("NpkStream.WriteByte method is not supported");
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}
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#endregion
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#region IDisposable Members
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bool _disposed = false;
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protected override void Dispose (bool disposing)
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{
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if (!_disposed)
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{
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if (disposing)
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{
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if (null != m_stream)
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m_stream.Dispose();
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m_segment.Dispose();
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}
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_disposed = true;
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base.Dispose (disposing);
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}
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}
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#endregion
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}
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[Serializable]
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public class Npk2Scheme : ResourceScheme
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{
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public Dictionary<string, byte[]> KnownKeys;
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}
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}
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