mirror of
https://github.com/crskycode/GARbro.git
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227 lines
8.6 KiB
C#
227 lines
8.6 KiB
C#
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//! \file ArcSX.cs
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//! \date 2022 Apr 29
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//! \brief SakanaGL resource archive implementation.
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//
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// Copyright (C) 2022 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 GameRes.Utility;
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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.Text;
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namespace GameRes.Formats.Sakana
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{
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internal class SxEntry : PackedEntry
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{
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public ushort Flags;
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public bool IsEncrypted { get { return 0 == (Flags & 0x10); } }
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}
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[Export(typeof(ArchiveFormat))]
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public class SxOpener : ArchiveFormat
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{
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public override string Tag { get { return "SXSTORAGE"; } }
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public override string Description { get { return "SakanaGL engine resource archive"; } }
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public override uint Signature { get { return 0; } }
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public override bool IsHierarchic { get { return true; } }
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public override bool CanWrite { get { return false; } }
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const uint DefaultKey = 0x2E76034B;
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public override ArcFile TryOpen (ArcView file)
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{
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var base_name = Path.GetFileName (file.Name);
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var sx_name = base_name.Substring (0, 4) + "(00).sx";
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sx_name = VFS.ChangeFileName (file.Name, sx_name);
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if (!VFS.FileExists (sx_name) || file.Name.Equals (sx_name, StringComparison.InvariantCultureIgnoreCase))
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return null;
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byte[] index_data;
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using (var sx = VFS.OpenView (sx_name))
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{
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if (sx.MaxOffset <= 0x10)
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return null;
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if (!sx.View.AsciiEqual (0, "SSXXDEFL"))
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return null;
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int key = Binary.BigEndian (sx.View.ReadInt32 (8));
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int length = (int)(sx.MaxOffset - 0x10);
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var index_packed = sx.View.ReadBytes (0x10, (uint)length);
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long lkey = (long)key + length;
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lkey = key ^ (961 * lkey - 124789) ^ DefaultKey;
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uint key_lo = (uint)lkey;
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uint key_hi = (uint)(lkey >> 32) ^ 0x2E6;
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DecryptData (index_packed, key_lo, key_hi);
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index_data = UnpackZstd (index_packed);
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}
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using (var index = new BinMemoryStream (index_data))
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{
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var reader = new SxIndexDeserializer (index, file.MaxOffset);
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var dir = reader.Deserialize();
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return new ArcFile (file, this, dir);
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}
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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 sx_entry = entry as SxEntry;
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if (null == sx_entry || (!sx_entry.IsEncrypted && !sx_entry.IsPacked))
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return base.OpenEntry (arc, entry);
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var input = arc.File.View.ReadBytes (entry.Offset, entry.Size);
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if (sx_entry.IsEncrypted)
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{
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uint key_lo = (uint)(entry.Offset >> 4) ^ (entry.Size << 16) ^ DefaultKey;
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uint key_hi = (entry.Size >> 16) ^ 0x2E6;
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DecryptData (input, key_lo, key_hi);
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}
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if (sx_entry.IsPacked)
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input = UnpackZstd (input);
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return new BinMemoryStream (input, entry.Name);
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}
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internal static byte[] UnpackZstd (byte[] data)
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{
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int unpacked_size = BigEndian.ToInt32 (data, 0);
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using (var dec = new ZstdNet.Decompressor())
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{
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var packed = new ArraySegment<byte> (data, 4, data.Length - 4);
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return dec.Unwrap (packed, unpacked_size);
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}
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}
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internal static void DecryptData (byte[] data, uint key_lo, uint key_hi)
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{
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if (data.Length < 4)
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return;
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key_lo ^= 0x159A55E5;
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key_hi ^= 0x075BCD15;
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uint v1 = key_hi ^ (key_hi << 11) ^ ((key_hi ^ (key_hi << 11)) >> 8) ^ 0x549139A;
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uint v2 = v1 ^ key_lo ^ (key_lo << 11) ^ ((key_lo ^ (key_lo << 11) ^ (v1 >> 11)) >> 8);
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uint v3 = v2 ^ (v2 >> 19) ^ 0x8E415C26;
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uint v4 = v3 ^ (v3 >> 19) ^ 0x4D9D5BB8;
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int count = data.Length / 4;
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unsafe
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{
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fixed (byte* data_raw = data)
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{
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uint* data32 = (uint*)&data_raw[0];
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for (int i = 0; i < count; ++i)
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{
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uint t1 = v4 ^ v1 ^ (v1 << 11) ^ ((v1 ^ (v1 << 11) ^ (v4 >> 11)) >> 8);
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uint t2 = v2 ^ (v2 << 11);
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v2 = v4;
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v4 = t1 ^ t2 ^ ((t2 ^ (t1 >> 11)) >> 8);
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data32[i] ^= (t1 >> 4) ^ (v4 << 12);
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v1 = v3;
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v3 = t1;
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}
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}
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}
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}
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}
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internal class SxIndexDeserializer
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{
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IBinaryStream m_index;
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long m_max_offset;
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string[] m_name_list;
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List<Entry> m_dir;
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public SxIndexDeserializer (IBinaryStream index, long max_offset)
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{
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m_index = index;
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m_max_offset = max_offset;
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}
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public List<Entry> Deserialize ()
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{
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m_index.Position = 8;
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int count = Binary.BigEndian (m_index.ReadInt32());
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m_name_list = new string[count];
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for (int i = 0; i < count; ++i)
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{
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int length = m_index.ReadUInt8();
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m_name_list[i] = m_index.ReadCString (length, Encoding.UTF8);
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}
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count = Binary.BigEndian (m_index.ReadInt32());
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m_dir = new List<Entry> (count);
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for (int i = 0; i < count; ++i)
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{
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m_index.ReadUInt16();
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ushort flags = Binary.BigEndian (m_index.ReadUInt16());
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uint offset = Binary.BigEndian (m_index.ReadUInt32());
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uint size = Binary.BigEndian (m_index.ReadUInt32());
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var entry = new SxEntry {
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Flags = flags,
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Offset = (long)offset << 4,
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Size = size,
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IsPacked = 0 != (flags & 0x03),
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};
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if (!entry.CheckPlacement (m_max_offset))
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return null;
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m_dir.Add (entry);
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}
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count = Binary.BigEndian (m_index.ReadUInt16());
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for (int i = 0; i < count; ++i)
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{
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m_index.ReadUInt32();
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m_index.ReadUInt32();
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m_index.ReadUInt32();
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Binary.BigEndian (m_index.ReadUInt32()); // archive body length
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m_index.ReadUInt64();
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m_index.Seek (16, SeekOrigin.Current); // MD5 sum
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}
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count = Binary.BigEndian (m_index.ReadUInt16());
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if (count > 0)
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m_index.Seek (count * 24, SeekOrigin.Current);
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DeserializeTree();
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return m_dir;
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}
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void DeserializeTree (string path = "")
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{
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int count = Binary.BigEndian (m_index.ReadUInt16());
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int name_index = Binary.BigEndian (m_index.ReadInt32());
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int file_index = Binary.BigEndian (m_index.ReadInt32());
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var name = Path.Combine (path, m_name_list[name_index]);
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if (-1 == file_index)
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{
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for (int i = 0; i < count; ++i)
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{
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DeserializeTree (name);
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}
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}
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else
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{
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m_dir[file_index].Name = name;
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m_dir[file_index].Type = FormatCatalog.Instance.GetTypeFromName (name);
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}
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}
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}
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}
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