implemented GRP audio archive.

ArcFormats/ArcFormats.csproj

@@ -99,6 +99,7 @@
     <Compile Include="Cadath\ImageCGF.cs" />
     <Compile Include="Crowd\ImageCRZ.cs" />
     <Compile Include="Cyberworks\ArcApp.cs" />
+    <Compile Include="ExHibit\ArcGRP.cs" />
     <Compile Include="Foster\ArcC24.cs" />
     <Compile Include="Foster\ArcFA2.cs" />
     <Compile Include="Foster\ImageC24.cs" />

ArcFormats/ExHibit/ArcGRP.cs

@@ -0,0 +1,129 @@
+//! \file       ArcGRP.cs
+//! \date       Thu Apr 06 16:41:59 2017
+//! \brief      ExHIBIT audio resource archive.
+//
+// Copyright (C) 2017 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.Text;
+using System.Text.RegularExpressions;
+
+namespace GameRes.Formats.ExHibit
+{
+    [Export(typeof(ArchiveFormat))]
+    public class GrpOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "GRP/EXHIBIT"; } }
+        public override string Description { get { return "ExHIBIT engine audio resource archive"; } }
+        public override uint     Signature { get { return 0; } }
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool      CanWrite { get { return false; } }
+
+        static readonly Regex s_ResNameRe = new Regex (@"res(\d+)\.grp$", RegexOptions.IgnoreCase);
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            var match = s_ResNameRe.Match (file.Name);
+            if (!match.Success || file.View.AsciiEqual (0, "AiFS"))
+                return null;
+
+            var digits = match.Groups[1];
+            int arc_num = UInt16.Parse (digits.Value);
+            int toc_num = arc_num - 1;
+            int arc_index = 1; // number by which archive is referenced within toc file
+
+            // look for toc file
+            ArcView toc_file = null;
+            var toc_name_sb = new StringBuilder (file.Name.Length);
+            while (toc_num >= 0)
+            {
+                toc_name_sb.Clear();
+                toc_name_sb.Append (file.Name);
+                toc_name_sb.Remove (digits.Index, digits.Length);
+                toc_name_sb.Insert (digits.Index, toc_num.ToString ("D4"));
+                var toc_name = toc_name_sb.ToString();
+                if (!VFS.FileExists (toc_name))
+                    return null;
+                toc_file = VFS.OpenView (toc_name);
+                if (toc_file.View.AsciiEqual (0, "AiFS"))
+                    break;
+                toc_file.Dispose();
+                toc_file = null;
+                toc_num--;
+                arc_index++;
+            }
+            if (null == toc_file)
+                return null;
+            using (toc_file)
+            {
+                int res_count = toc_file.View.ReadInt32 (0xC);
+                if (res_count < arc_index)
+                    return null;
+                uint index_offset = 0x10;
+                // find archive reference within toc file
+                bool arc_found = false;
+                for (int i = 0; i < res_count && index_offset < toc_file.MaxOffset; ++i)
+                {
+                    if (toc_file.View.ReadInt32 (index_offset) == arc_index)
+                    {
+                        arc_found = true;
+                        break;
+                    }
+                    uint entries = toc_file.View.ReadUInt32 (index_offset+0xC);
+                    index_offset += 0x10 + entries * 8;
+                }
+                if (!arc_found)
+                    return null;
+                int count = toc_file.View.ReadInt32 (index_offset+0xC);
+                if (!IsSaneCount (count))
+                    return null;
+                int start_index = toc_file.View.ReadInt32 (index_offset+4);
+                index_offset += 0x10;
+                var dir = new List<Entry> (count);
+                for (int i = 0; i < count; ++i)
+                {
+                    uint offset = toc_file.View.ReadUInt32 (index_offset);
+                    uint size   = toc_file.View.ReadUInt32 (index_offset+4);
+                    if (size != 0)
+                    {
+                        var entry = new Entry {
+                            Name = string.Format ("{0:D5}.ogg", start_index+i),
+                            Type = "audio",
+                            Offset = offset,
+                            Size = size,
+                        };
+                        entry.Offset = toc_file.View.ReadUInt32 (index_offset);
+                        if (!entry.CheckPlacement (file.MaxOffset))
+                            return null;
+                        dir.Add (entry);
+                    }
+                    index_offset += 8;
+                }
+                if (0 == dir.Count)
+                    return null;
+                return new ArcFile (file, this, dir);
+            }
+        }
+    }
+}