variation of Nitro+ PAK archives.

ArcFormats/ArcFormats.csproj

@@ -96,6 +96,7 @@
     <Compile Include="ImageLZ.cs" />
     <Compile Include="KiriKiri\ChainReactionCrypt.cs" />
     <Compile Include="Liar\ImageLIM.cs" />
+    <Compile Include="NitroPlus\ArcPAK.cs" />
     <Compile Include="MnoViolet\ImageDIF.cs" />
     <Compile Include="Nexas\ImageGRP.cs" />
     <Compile Include="NitroPlus\ArcNPK.cs" />

ArcFormats/NitroPlus/ArcNitro.cs

@@ -84,7 +84,7 @@ namespace GameRes.Formats.NitroPlus
                 return null;
             int unpacked_size = file.View.ReadInt32 (8);
             uint packed_size = file.View.ReadUInt32 (0xC);
-            var input = file.CreateStream (0x114, packed_size);
+            using (var input = file.CreateStream (0x114, packed_size))
             using (var header_stream = new ZLibStream (input, CompressionMode.Decompress))
             using (var header = new BinaryReader (header_stream, Encoding.ASCII, true))
             {
@@ -147,7 +147,7 @@ namespace GameRes.Formats.NitroPlus
             var dir = new List<Entry> (count);
             uint header_size = file.View.ReadUInt32 (0x110) ^ size_xor;
             long base_offset = 0x114 + header_size;
-            var input = file.CreateStream (0x114, header_size);
+            using (var input = file.CreateStream (0x114, header_size))
             using (var header_stream = new ZLibStream (input, CompressionMode.Decompress))
             using (var header = new BinaryReader (header_stream, Encoding.ASCII, true))
             {

ArcFormats/NitroPlus/ArcPAK.cs

@@ -0,0 +1,112 @@
+//! \file       ArcPAK.cs
+//! \date       Sat May 21 00:12:14 2016
+//! \brief      MAGI 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 GameRes.Compression;
+
+namespace GameRes.Formats.Magi
+{
+    // this format is very similar to NitroPlus.PakOpener v3, but has no encryption.
+    //
+    [Export(typeof(ArchiveFormat))]
+    public class PakOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "PAK/MAGI"; } }
+        public override string Description { get { return "MAGI resource archive"; } }
+        public override uint     Signature { get { return 3; } }
+        public override bool  IsHierarchic { get { return true; } }
+        public override bool     CanCreate { get { return false; } }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            int count = file.View.ReadInt32 (4);
+            if (!IsSaneCount (count))
+                return null;
+            uint index_size = file.View.ReadUInt32 (0xC);
+            if (index_size > file.MaxOffset)
+                return null;
+
+            long base_offset = 0x118 + index_size;
+
+            using (var mem = file.CreateStream (0x118, index_size))
+            using (var z = new ZLibStream (mem, CompressionMode.Decompress))
+            using (var index = new BinaryReader (z))
+            {
+                var name_buffer = new byte[0x100];
+                var dir = new List<Entry> (count);
+                for (int i = 0; i < count; ++i)
+                {
+                    int name_length = index.ReadInt32();
+                    if (name_length <= 0 || name_length > name_buffer.Length)
+                        return null;
+                    if (name_length != index.Read (name_buffer, 0, name_length))
+                        return null;
+                    var name = Encodings.cp932.GetString (name_buffer, 0, name_length);
+                    var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
+                    entry.Offset = index.ReadUInt32() + base_offset;
+                    uint size    = index.ReadUInt32();
+                    index.ReadUInt32();
+                    uint flags = index.ReadUInt32();
+                    uint packed_size = index.ReadUInt32();
+                    entry.IsPacked = flags != 0 && packed_size != 0;
+                    if (entry.IsPacked)
+                    {
+                        entry.Size = packed_size;
+                        entry.UnpackedSize = size;
+                    }
+                    else
+                    {
+                        entry.Size = size;
+                        entry.UnpackedSize = size;
+                    }
+                    if (!entry.CheckPlacement (file.MaxOffset))
+                        return null;
+                    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 pentry = entry as PackedEntry;
+            if (null == pentry || !pentry.IsPacked)
+                return input;
+            try
+            {
+                return new ZLibStream (input, CompressionMode.Decompress);
+            }
+            catch
+            {
+                input.Dispose();
+                throw;
+            }
+        }
+    }
+}

supported.html

@@ -144,10 +144,12 @@ Sweet Pool<br/>
 Zoku Satsuriku no Django<br/>
 </td></tr>
 <tr class="odd"><td>*.npa</td><td>-</td><td>Yes</td><td>Nitro+</td><td>Steins;Gate</td></tr>
-<tr><td>*.pak</td><td><tt>\002\000\000\000</tt><br/><tt>\003\000\000\000</tt></td><td>No</td><td>Nitro+<br/>CoreMoreco</td><td>
+<tr><td>*.pak</td><td><tt>\002\000\000\000</tt><br/><tt>\003\000\000\000</tt></td><td>No</td><td>Nitro+<br/>CoreMoreco<br/>MAGI<br/></td><td>
 Hanachirasu<br/>
 Jingai Makyou<br/>
 Chibi Mama<br/>
+Ore to Imouto no Kounai Play<br/>
+Ren'ai Jugyou ~Oshiego no Yuuwaku~<br/>
 </td></tr>
 <tr class="odd"><td>*.nsa<br/>*.sar</td><td>-</td><td>Yes<a href="#note-1" class="footnote">1</a></td><td>NScripter</td><td>
 Binary Pot<br/>
@@ -345,6 +347,7 @@ Zansho Omimai Moushiagemasu<span class="footnote">ShiinaRio v2.41</span><br/>
 <tr><td>*.ogv</td><td><tt>OGV</tt></td><td>No</td></tr>
 <tr><td>*.pad</td><td><tt>PAD</tt></td><td>No</td></tr>
 <tr class="odd"><td>*</td><td><tt>ARC2</tt><br/><tt>ARC1</tt></td><td>No</td><td>AST</td><td>
+Bokura wa Piacere<br/>
 Jokyoushi wo Kurau<br/>
 Lovers Collection<br/>
 Nachtmusik<br/>
@@ -830,6 +833,10 @@ Nora to Oujo to Noraneko Heart<br/>
 Tsujidou-san no Jun'ai Road<br/>
 Tsujidou-san no Virgin Road<br/>
 </td></tr>
+<tr><td>*.pak</td><td>-</td><td>No</td><td>MAGI</td><td>
+Ore to Imouto no Kounai Play<br/>
+Ren'ai Jugyou ~Oshiego no Yuuwaku~<br/>
+</td></tr>
 </table>
 <p><a name="note-1" class="footnote">1</a> Non-encrypted only</p>
 </body>