From 7360e65a6bcea976f470239f9c1463f9b527bd55 Mon Sep 17 00:00:00 2001
From: morkt <morkt@users.noreply.github.com>
Date: Wed, 21 Mar 2018 09:49:48 +0400
Subject: [PATCH] implemented AIMS engine archives.

---
 ArcFormats/Aims/ArcPACK.cs   | 117 +++++++++++++++++++++++++++++++++++
 ArcFormats/ArcFormats.csproj |   1 +
 2 files changed, 118 insertions(+)
 create mode 100644 ArcFormats/Aims/ArcPACK.cs

diff --git a/ArcFormats/Aims/ArcPACK.cs b/ArcFormats/Aims/ArcPACK.cs
new file mode 100644
index 00000000..e75595e3
--- /dev/null
+++ b/ArcFormats/Aims/ArcPACK.cs
@@ -0,0 +1,117 @@
+//! \file       ArcPACK.cs
+//! \date       2018 Mar 20
+//! \brief      AIMS engine resource archive.
+//
+// Copyright (C) 2018 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.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+using GameRes.Compression;
+using GameRes.Cryptography;
+
+namespace GameRes.Formats.Aims
+{
+    internal class LunaArchive : ArcFile
+    {
+        public readonly byte[] Key;
+
+        public LunaArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, byte[] key)
+            : base (arc, impl, dir)
+        {
+            Key = key;
+        }
+    }
+
+    [Export(typeof(ArchiveFormat))]
+    public class PackOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "PACK/AIMS"; } }
+        public override string Description { get { return "AIMS engine resource archive"; } }
+        public override uint     Signature { get { return 0x4B434150; } } // 'PACK'
+        public override bool  IsHierarchic { get { return true; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public PackOpener ()
+        {
+            Extensions = new string[] { "p", "mus" };
+        }
+
+        // entry record
+        // 0x00 name
+        // 0x40 name crc32
+        // 0x44 data crc32
+        // 0x48 offset
+        // 0x4C size
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            int count = file.View.ReadInt32 (4);
+            if (!IsSaneCount (count))
+                return null;
+
+            uint index_offset = 8;
+            var dir = new List<Entry> (count);
+            for (int i = 0; i < count; ++i)
+            {
+                var name = file.View.ReadString (index_offset, 0x40);
+                var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
+                entry.Offset = file.View.ReadUInt32 (index_offset+0x48);
+                entry.Size   = file.View.ReadUInt32 (index_offset+0x4C);
+                if (!entry.CheckPlacement (file.MaxOffset))
+                    return null;
+                dir.Add (entry);
+                index_offset += 0x50;
+            }
+            return new LunaArchive (file, this, dir, DefaultKey);
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var larc = arc as LunaArchive;
+            if (null == arc || !arc.File.View.AsciiEqual (entry.Offset, "LZSS"))
+                return base.OpenEntry (arc, entry);
+
+            uint unpacked_size = arc.File.View.ReadUInt32 (entry.Offset+4);
+            Stream input = arc.File.CreateStream (entry.Offset+8, entry.Size-8);
+            if (larc.Key != null)
+            {
+                var bf = new Blowfish (larc.Key);
+                input = new InputCryptoStream (input, bf.CreateDecryptor());
+                return new LimitStream (input, unpacked_size);
+            }
+            else
+            {
+                var lz = new LzssStream (input);
+                lz.Config.FrameInitPos = 0xFF0;
+                return lz;
+            }
+        }
+
+        static readonly byte[] DefaultKey = {
+            0x7D, 0x73, 0xF6, 0xE4, 0xF5, 0x81, 0x5F, 0x7C, 0x78, 0x30, 0xC2, 0x36, 0xEA, 0x3E, 0x8A, 0x76,
+            0xF7, 0xE0, 0x48, 0xB5, 0x85, 0xD7, 0x77, 0x49, 0x4C, 0x3D, 0xF5, 0x0C, 0xBB, 0xFB, 0x2E, 0x44,
+            0xFE, 0x25, 0xB7, 0xEB, 0xC7, 0xD9, 0x33, 0xAB, 0xA8, 0x2C, 0x64, 0xE8, 0xF0, 0xBD, 0xEB, 0x8D,
+            0x9D, 0x1D, 0xA2, 0xFC, 0x59, 0x09, 0xAA, 0xA4,
+        };
+    }
+}
diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index b20b6c70..f3c36672 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -154,6 +154,7 @@
     <Compile Include="Lambda\ImageCLS.cs" />
     <Compile Include="Lilim\ImageIMG.cs" />
     <Compile Include="LiveMaker\ArcGALX.cs" />
+    <Compile Include="Aims\ArcPACK.cs" />
     <Compile Include="Maika\ArcBK.cs" />
     <Compile Include="Maika\ArcMIK01.cs" />
     <Compile Include="Maika\AudioWV5.cs" />