From 0b52b4db8049c1f3a5525ef3bd10930612b782c3 Mon Sep 17 00:00:00 2001
From: morkt <morkt@users.noreply.github.com>
Date: Tue, 22 May 2018 17:43:32 +0400
Subject: [PATCH] implemented CPZ1 archives.

---
 ArcFormats/ArcFormats.csproj |   2 +
 ArcFormats/Cmvs/ArcCPZ1.cs   | 101 +++++++++++++++++++++++++++++++++++
 2 files changed, 103 insertions(+)
 create mode 100644 ArcFormats/Cmvs/ArcCPZ1.cs

diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index d0cdf557..cb02783c 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -132,6 +132,7 @@
     <Compile Include="Cadath\ImageCGF.cs" />
     <Compile Include="Carriere\ArcARC.cs" />
     <Compile Include="Carriere\ImageCGD.cs" />
+    <Compile Include="Cmvs\ArcCPZ1.cs" />
     <Compile Include="Cmvs\CpzHeader.cs" />
     <Compile Include="Cmvs\HuffmanDecoder.cs" />
     <Compile Include="Crowd\ImageCRZ.cs" />
@@ -649,6 +650,7 @@
     <Compile Include="uGOS\ArcDET.cs" />
     <Compile Include="uGOS\ImageBMP.cs" />
     <Compile Include="AdvSys\ArcGR2.cs" />
+    <Compile Include="UMeSoft\ArcMGX.cs" />
     <Compile Include="UMeSoft\ArcPK.cs" />
     <Compile Include="Qlie\ArcQLIE.cs" />
     <Compile Include="RenPy\ArcRPA.cs" />
diff --git a/ArcFormats/Cmvs/ArcCPZ1.cs b/ArcFormats/Cmvs/ArcCPZ1.cs
new file mode 100644
index 00000000..62bcd2bc
--- /dev/null
+++ b/ArcFormats/Cmvs/ArcCPZ1.cs
@@ -0,0 +1,101 @@
+//! \file       ArcCPZ1.cs
+//! \date       2018 May 21
+//! \brief      Purple Software 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.Utility;
+
+namespace GameRes.Formats.Purple
+{
+    [Export(typeof(ArchiveFormat))]
+    public class Cpz1Opener : ArchiveFormat
+    {
+        public override string         Tag { get { return "CPZ1"; } }
+        public override string Description { get { return "CVNS engine resource archive"; } }
+        public override uint     Signature { get { return 0x315A5043; } } // 'CPZ1'
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public Cpz1Opener ()
+        {
+            Extensions = new string[] { "cpz" };
+        }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            int count = file.View.ReadInt32 (4);
+            if (!IsSaneCount (count))
+                return null;
+            uint index_size = file.View.ReadUInt32 (8);
+            var index = file.View.ReadBytes (0x10, index_size);
+            DecryptData (index, DefaultKey);
+            long base_offset = 0x10 + index_size;
+            int index_offset = 0;
+            var dir = new List<Entry> (count);
+            for (int i = 0; i < count; ++i)
+            {
+                int entry_size = LittleEndian.ToInt32 (index, index_offset);
+                if (entry_size <= 0 || entry_size > index.Length - index_offset)
+                    return null;
+                var name = Binary.GetCString (index, index_offset+0x18);
+                var entry = FormatCatalog.Instance.Create<Entry> (name);
+                entry.Size = LittleEndian.ToUInt32 (index, index_offset+4);
+                entry.Offset = LittleEndian.ToUInt32 (index, index_offset+8) + base_offset;
+                if (!entry.CheckPlacement (file.MaxOffset))
+                    return null;
+                dir.Add (entry);
+                index_offset += entry_size;
+            }
+            return new ArcFile (file, this, dir);
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
+            DecryptData (data, DefaultKey);
+            if (Binary.AsciiEqual (data, "PSS0"))
+                data = CpzOpener.UnpackLzss (data);
+            return new BinMemoryStream (data, entry.Name);
+        }
+
+        void DecryptData (byte[] data, byte[] key)
+        {
+            if (key.Length < 0x40)
+                throw new System.ArgumentException ("Invalid CPZ1 key");
+            for (int i = 0; i < data.Length; i++)
+            {
+                data[i] = (byte)((data[i] ^ key[i & 0x3F]) - 0x6C);
+            }
+        }
+
+        static readonly byte[] DefaultKey = {
+            0x92, 0xCD, 0x97, 0x90, 0x8C, 0xD7, 0x8C, 0xD5, 0x8B, 0x4B, 0x93, 0xFA, 0x9A, 0xD7, 0x8C, 0xBF,
+            0x8C, 0xC9, 0x8C, 0xEB, 0x8D, 0x69, 0x8D, 0x8B, 0x8C, 0xD2, 0x8C, 0xD6, 0x8B, 0x6D, 0x8C, 0xE3,
+            0x8C, 0xFB, 0x8C, 0xD0, 0x8C, 0xC8, 0x8C, 0xF0, 0x8B, 0xFE, 0x8C, 0xAA, 0x8C, 0xF4, 0x8B, 0x4B,
+            0x9C, 0x58, 0x8C, 0xD3, 0x96, 0xC8, 0x8C, 0xCB, 0x8C, 0xCE, 0x8C, 0xF3, 0x8C, 0xD6, 0x8B, 0x52,
+        };
+    }
+}