From 3e8c921493d671d4a4ed211c885644b1cd15f296 Mon Sep 17 00:00:00 2001
From: morkt <muvluv.ru@gmail.com>
Date: Sun, 26 Jun 2016 00:20:36 +0400
Subject: [PATCH] another archive format.

---
 ArcFormats/ArcFormats.csproj      |   1 +
 ArcFormats/BlackRainbow/ArcPAK.cs | 101 ++++++++++++++++++++++++++++++
 supported.html                    |   4 ++
 3 files changed, 106 insertions(+)
 create mode 100644 ArcFormats/BlackRainbow/ArcPAK.cs

diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index cdd98d6d..331ca323 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -74,6 +74,7 @@
     <Compile Include="Aoi\ImageAGF.cs" />
     <Compile Include="ArcCG.cs" />
     <Compile Include="Banana\ImageGEC.cs" />
+    <Compile Include="BlackRainbow\ArcPAK.cs" />
     <Compile Include="Cmvs\ArcPBZ.cs" />
     <Compile Include="Cmvs\AudioMV.cs" />
     <Compile Include="Cmvs\ImagePSB.cs" />
diff --git a/ArcFormats/BlackRainbow/ArcPAK.cs b/ArcFormats/BlackRainbow/ArcPAK.cs
new file mode 100644
index 00000000..e8aeb55f
--- /dev/null
+++ b/ArcFormats/BlackRainbow/ArcPAK.cs
@@ -0,0 +1,101 @@
+//! \file       ArcPAK.cs
+//! \date       Sat Jun 25 21:39:46 2016
+//! \brief      Black Rainbow resource archive.
+//
+// Copyright (C) 2016 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;
+using System.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+using System.Text;
+using GameRes.Compression;
+
+namespace GameRes.Formats.BlackRainbow
+{
+    [Export(typeof(ArchiveFormat))]
+    public class PakOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "PAK/MELTY"; } }
+        public override string Description { get { return "BlackRainbow/Melty resource archive"; } }
+        public override uint     Signature { get { return 0; } }
+        public override bool  IsHierarchic { get { return true; } }
+        public override bool     CanCreate { get { return false; } }
+
+        public PakOpener ()
+        {
+            Extensions = new string[] { "pak" };
+        }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            if (file.MaxOffset <= 8)
+                return null;
+            int count = file.View.ReadInt32 (file.MaxOffset-8);
+            if (!IsSaneCount (count))
+                return null;
+            uint index_size = file.View.ReadUInt32 (file.MaxOffset-4);
+            if (index_size >= file.MaxOffset-8)
+                return null;
+
+            long index_offset = file.MaxOffset - 8 - index_size;
+            using (var input = file.CreateStream (index_offset, index_size))
+            using (var index = new BinaryReader (input, Encoding.Unicode))
+            {
+                char[] name_buffer = new char[0x40];
+                var dir = new List<Entry> (count);
+                for (int i = 0; i < count; ++i)
+                {
+                    uint offset = index.ReadUInt32();
+                    uint packed_size = index.ReadUInt32();
+                    uint unpacked_size = index.ReadUInt32();
+                    int name_length = index.ReadInt32();
+                    if (name_length <= 0 || name_length > 0x100 )
+                        return null;
+                    if (name_length > name_buffer.Length)
+                        name_buffer = new char[name_length];
+                    if (name_length != index.Read (name_buffer, 0, name_length))
+                        return null;
+                    var name = new string (name_buffer, 0, name_length);
+                    var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
+                    entry.Offset = offset;
+                    entry.Size = packed_size;
+                    if (!entry.CheckPlacement (file.MaxOffset))
+                        return null;
+                    entry.IsPacked = uint.MaxValue != unpacked_size;
+                    entry.UnpackedSize = entry.IsPacked ? unpacked_size : packed_size;
+                    dir.Add (entry);
+                }
+                return new ArcFile (file, this, dir);
+            }
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var input = arc.File.CreateStream (entry.Offset, entry.Size);
+            var pent = entry as PackedEntry;
+            if (null == pent || !pent.IsPacked)
+                return input;
+            return new ZLibStream (input, CompressionMode.Decompress);
+        }
+    }
+}
diff --git a/supported.html b/supported.html
index d24f8b45..67559a2d 100644
--- a/supported.html
+++ b/supported.html
@@ -911,6 +911,10 @@ Karen<br/>
 </td></tr>
 <tr class="odd"><td>*.psb</td><td><tt>PSBP</tt></td><td>No</td></tr>
 <tr class="odd"><td>*.mk</td><td><tt>MKVS</tt></td><td>No</td></tr>
+<tr><td>*.pak</td><td>-</td><td>No</td><td>Black Rainbow<br/>Melty</td><td>
+Ingoku Chikan Ressha<br/>
+Peropero Saimin 3 Raouden ~Yousei no Sakuryaku~<br/>
+</td></tr>
 </table>
 <p><a name="note-1" class="footnote">1</a> Non-encrypted only</p>
 </body>