mirror of
https://github.com/crskycode/GARbro.git
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264 lines
9.5 KiB
C#
264 lines
9.5 KiB
C#
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//! \file ArcEPK.cs
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//! \date Sat Jan 07 11:30:02 2017
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//! \brief Ellefin Game System resource archive.
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//
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// Copyright (C) 2017 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 GameRes.Compression;
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using GameRes.Formats.Lucifen;
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using GameRes.Utility;
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/// <summary>
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/// Ellefin Game System is a Lucifen predecessor.
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/// </summary>
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namespace GameRes.Formats.Ellefin
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{
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internal class EpkEntry : PackedEntry
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{
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public int DirIndex;
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}
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internal class EpkInfo : LpkInfo
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{
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public bool IndexEncrypted;
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}
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[Export(typeof(ArchiveFormat))]
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public class EpkOpener : ArchiveFormat
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{
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public override string Tag { get { return "EPK/Ellefin"; } }
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public override string Description { get { return "Ellefin Game System 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 EpkOpener ()
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{
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Signatures = new uint[] { 0x1A4B5045, 0x1E4B5045, 0 };
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}
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static readonly EncryptionScheme DefaultScheme = new EncryptionScheme
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{
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BaseKey = new LpkOpener.Key (0xA6BD375E, 0x375D916B), ContentXor = 0xD9, RotatePattern = 0x17236351
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};
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public override ArcFile TryOpen (ArcView file)
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{
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if (!file.View.AsciiEqual (0, "EPK"))
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return null;
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int flags = file.View.ReadByte (3);
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if (0 == (flags & 2))
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return null;
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var scheme = DefaultScheme;
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uint arc_key = scheme.BaseKey.Key1;
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uint index_key = scheme.BaseKey.Key2;
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var arc_info = new EpkInfo
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{
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AlignedOffset = 0 != (flags & 1),
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Flag1 = 0 != (flags & 2),
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WholeCrypt = 0 != (flags & 4),
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IsEncrypted = 0 != (flags & 8),
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IndexEncrypted = 0 != (flags & 0xF0),
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PackedEntries = true,
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};
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uint index_size = file.View.ReadUInt32 (4);
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if (arc_info.IndexEncrypted)
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{
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var base_name = Path.GetFileNameWithoutExtension (file.Name).ToUpperInvariant();
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var name_bytes = Encodings.cp932.GetBytes (base_name);
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int back = name_bytes.Length-1;
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for (int i = 0; i < name_bytes.Length; ++i)
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{
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arc_key ^= name_bytes[back-i];
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index_key ^= name_bytes[i];
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arc_key = Binary.RotR (arc_key, 8);
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index_key = Binary.RotL (index_key, 8);
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}
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index_size ^= index_key;
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}
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arc_info.Key = arc_key;
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if (arc_info.AlignedOffset)
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index_size <<= 11;
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if (!arc_info.IndexEncrypted || arc_info.AlignedOffset)
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index_size -= 8;
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if (index_size >= file.MaxOffset)
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return null;
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var index = file.View.ReadBytes (8, index_size);
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if (arc_info.IndexEncrypted)
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scheme.DecryptIndex (index, index.Length, index_key);
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var reader = new EpkIndexReader (arc_info);
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var dir = reader.Read (index);
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if (null == dir)
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return null;
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if (arc_info.IndexEncrypted)
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return new LuciArchive (file, this, dir, scheme, arc_info);
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else
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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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Stream input = arc.File.CreateStream (entry.Offset, entry.Size);
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var epk_ent = entry as PackedEntry;
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if (null == epk_ent)
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return input;
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if (epk_ent.IsPacked)
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{
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input = new LzssStream (input);
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}
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var epk = arc as LuciArchive;
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if (null == epk || (!epk.Info.WholeCrypt && !epk.Info.IsEncrypted && null == epk.Info.Prefix))
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return input;
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var data = new byte[epk_ent.UnpackedSize];
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using (input)
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{
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input.Read (data, 0, data.Length);
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}
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if (epk.Info.WholeCrypt)
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{
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epk.Scheme.DecryptContent (data);
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}
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if (epk.Info.IsEncrypted)
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{
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int count = Math.Min (data.Length, 0x10);
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epk.Scheme.DecryptEntry (data, count, epk.Info.Key);
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}
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var header = epk.Info.Prefix;
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if (header != null && header.Length <= data.Length)
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Buffer.BlockCopy (header, 0, data, 0, header.Length);
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return new BinMemoryStream (data, entry.Name);
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}
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}
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internal sealed class EpkIndexReader
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{
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IBinaryStream m_index;
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EpkInfo m_info;
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List<Entry> m_dir;
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byte[] m_name_buf;
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bool m_wide_offset;
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public EpkIndexReader (EpkInfo info)
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{
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m_info = info;
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}
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public List<Entry> Read (byte[] index)
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{
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using (m_index = new BinMemoryStream (index))
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{
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int count = m_index.ReadInt32();
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if (!ArchiveFormat.IsSaneCount (count))
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return null;
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m_dir = new List<Entry> (count);
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if (m_info.IndexEncrypted)
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ParseEncryptedIndex (count);
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else
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ParseRegularIndex (count);
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return m_dir.Count > 0 ? m_dir : null;
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}
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}
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void ParseEncryptedIndex (int count)
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{
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int header_length = m_index.ReadUInt8();
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if (0 != header_length)
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{
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m_info.Prefix = m_index.ReadBytes (header_length);
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}
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m_wide_offset = m_index.ReadByte() != 0;
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int name_tree_length = m_index.ReadInt32();
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var entry_table_offset = m_index.Position + name_tree_length;
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m_name_buf = new byte[0x110];
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TraverseIndex (m_index.Position, 0);
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if (m_dir.Count != count)
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throw new InvalidFormatException();
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foreach (EpkEntry entry in m_dir)
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{
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m_index.Position = entry_table_offset + entry.DirIndex * 12;
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ReadEntry (entry);
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}
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}
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void ParseRegularIndex (int count)
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{
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for (int i = 0; i < count; ++i)
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{
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int name_length = m_index.ReadByte();
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var name = m_index.ReadCString (name_length);
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var entry = FormatCatalog.Instance.Create<EpkEntry> (name);
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ReadEntry (entry);
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m_dir.Add (entry);
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}
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}
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void ReadEntry (PackedEntry entry)
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{
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entry.Offset = m_index.ReadUInt32();
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entry.Size = m_index.ReadUInt32();
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entry.UnpackedSize = m_index.ReadUInt32();
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if (m_info.AlignedOffset)
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{
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entry.Offset <<= 11;
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entry.Size <<= 11; // ???
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}
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entry.IsPacked = entry.UnpackedSize != 0;
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if (!entry.IsPacked)
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entry.UnpackedSize = entry.Size;
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}
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void TraverseIndex (long pos, int name_length)
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{
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if (name_length >= m_name_buf.Length)
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throw new InvalidFormatException ("Entry filename is too long");
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m_index.Position = pos;
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int count = m_index.ReadByte();
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for (int i = 0; i < count; ++i)
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{
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byte next_letter = m_index.ReadUInt8();
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int next_offset = m_wide_offset ? m_index.ReadInt32() : (int)m_index.ReadUInt16();
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if (0 == next_letter)
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{
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var name = Encodings.cp932.GetString (m_name_buf, 0, name_length);
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var entry = FormatCatalog.Instance.Create<EpkEntry> (name);
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entry.DirIndex = next_offset;
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m_dir.Add (entry);
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}
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else
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{
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m_name_buf[name_length] = next_letter;
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pos = m_index.Position;
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TraverseIndex (pos + next_offset, name_length+1);
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m_index.Position = pos;
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}
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}
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}
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}
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}
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