implemented Artemis engine archives.

ArcFormats/ArcFormats.csproj

@@ -90,6 +90,7 @@
     <Compile Include="Aoi\ImageAGF.cs" />
     <Compile Include="ArcARCX.cs" />
     <Compile Include="ArcCG.cs" />
+    <Compile Include="Artemis\ArcPFS.cs" />
     <Compile Include="BlackRainbow\ArcDX.cs" />
     <Compile Include="Cadath\ArcKAR.cs" />
     <Compile Include="Cadath\ImageKGF.cs" />

ArcFormats/Artemis/ArcPFS.cs

@@ -0,0 +1,103 @@
+//! \file       ArcPFS.cs
+//! \date       Tue Dec 27 22:27:58 2016
+//! \brief      Artemis engine 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.Security.Cryptography;
+
+namespace GameRes.Formats.Artemis
+{
+    [Export(typeof(ArchiveFormat))]
+    public class PfsOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "PFS"; } }
+        public override string Description { get { return "Artemis engine resource archive"; } }
+        public override uint     Signature { get { return 0; } }
+        public override bool  IsHierarchic { get { return true; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public PfsOpener ()
+        {
+            Extensions = new string[] { "pfs", "000", "001", "002", "003" };
+        }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            if (!file.View.AsciiEqual (0, "pf"))
+                return null;
+            int version = file.View.ReadByte (2) - '0';
+            if (8 != version)
+                return null;
+            uint index_size = file.View.ReadUInt32 (3);
+            int count = file.View.ReadInt32 (7);
+            if (!IsSaneCount (count) || 7L + index_size > file.MaxOffset)
+                return null;
+
+            var index = file.View.ReadBytes (7, index_size);
+            int index_offset = 4;
+            var dir = new List<Entry> (count);
+            for (int i = 0; i < count; ++i)
+            {
+                int name_length = index.ToInt32 (index_offset);
+                var name = Encodings.cp932.GetString (index, index_offset+4, name_length);
+                index_offset += name_length + 8;
+                var entry = FormatCatalog.Instance.Create<Entry> (name);
+                entry.Offset = index.ToUInt32 (index_offset);
+                entry.Size   = index.ToUInt32 (index_offset+4);
+                if (!entry.CheckPlacement (file.MaxOffset))
+                    return null;
+                index_offset += 8;
+                dir.Add (entry);
+            }
+            using (var sha1 = SHA1.Create())
+            {
+                var key = sha1.ComputeHash (index); // calculated for archive versions 4, 5, 8 and 9
+                return new PfsArchive (file, this, dir, key);
+            }
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var parc = arc as PfsArchive;
+            var input = arc.File.CreateStream (entry.Offset, entry.Size);
+            if (null == parc)
+                return input;
+            return new ByteStringEncryptedStream (input, parc.Key);
+        }
+    }
+
+    internal class PfsArchive : ArcFile
+    {
+        public readonly byte[] Key;
+
+        public PfsArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, byte[] key)
+            : base (arc, impl, dir)
+        {
+            Key = key;
+        }
+    }
+}