feat: add support of Pia Carrot e Youkoso 4 Xbox360 archive

ArcFormats/ArcFormats.csproj

@@ -127,6 +127,7 @@
     <Compile Include="CsWare\AudioWAV.cs" />
     <Compile Include="CsWare\ImageGDT.cs" />
     <Compile Include="FC01\ArcBDT.cs" />
+    <Compile Include="FC01\ArcSCXA.cs" />
     <Compile Include="FC01\BdtTables.cs" />
     <Compile Include="GScripter\ArcDATA.cs" />
     <Compile Include="Ism\ImagePNG.cs" />

ArcFormats/FC01/ArcSCXA.cs

@@ -0,0 +1,50 @@
+using System.Collections.Generic;
+using System.ComponentModel.Composition;
+
+namespace GameRes.Formats.FC01
+{
+    [Export(typeof(ArchiveFormat))]
+    public class SCXAOpener : ArchiveFormat
+    {
+        public override string Tag { get { return "ARC/SCXA Pia Carrot e Youkoso 4 Xbox360"; } }
+        public override string Description { get { return "Pia Carrot e Youkoso 4 Xbox360 resource archive"; } }
+        public override uint Signature { get { return 0x41584353; } } // 'SCXA'
+        public override bool IsHierarchic { get { return false; } }
+        public override bool CanWrite { get { return false; } }
+
+        public override ArcFile TryOpen(ArcView file)
+        {
+            uint datastart = file.View.ReadUInt32(4);
+            int count = file.View.ReadInt32(8);
+            if (!IsSaneCount(count))
+                return null;
+            uint tnstart = (uint)count * 4 + 12;
+            var dir = new List<Entry>(count);
+            uint index_offset;
+            for (int i = 0; i < count; ++i)
+            {
+                uint namestart = file.View.ReadUInt32(i * 4 + 12);
+                uint fstart = file.View.ReadUInt32(tnstart + namestart);
+                uint flength = file.View.ReadUInt32(tnstart + namestart + 4);
+                index_offset = tnstart + namestart + 8;
+                byte c;
+                List<byte> namebyte = new List<byte>();
+                while (true)
+                {
+                    c = file.View.ReadByte((long)index_offset);
+                    if (c == 0 | index_offset > datastart) break;
+                    namebyte.Add(c);
+                    index_offset++;
+                }
+                var name = System.Text.Encoding.ASCII.GetString(namebyte.ToArray());
+                var entry = Create<Entry>(name);
+                entry.Offset = datastart + fstart;
+                entry.Size = flength;
+                if (!entry.CheckPlacement(file.MaxOffset))
+                    return null;
+                dir.Add(entry);
+            }
+            return new ArcFile(file, this, dir);
+        }
+    }
+}