Add music info loading infra

ClanServer/ClanServer.csproj

@@ -7,6 +7,14 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
 
+  <ItemGroup>
+    <None Remove="Data\L44\music_info_l44_8.kbin" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <EmbeddedResource Include="Data\L44\music_info_l44_8.kbin" />
+  </ItemGroup>
+
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.App" />
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="2.2.4" />

ClanServer/Data/L44/ClanMusicInfo.cs

@@ -0,0 +1,92 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Xml.Linq;
+using System.Threading.Tasks;
+using System.Reflection;
+using System.IO;
+
+using eAmuseCore.KBinXML;
+using eAmuseCore.Compression;
+
+namespace ClanServer.Data.L44
+{
+    public class ClanMusicInfo
+    {
+        static ClanMusicInfo()
+        {
+            Instance = Task.Run(() =>
+            {
+                foreach (string name in Assembly.GetExecutingAssembly().GetManifestResourceNames())
+                {
+                    if (name.EndsWith("music_info_l44_8.kbin", StringComparison.InvariantCultureIgnoreCase))
+                    {
+                        using (Stream stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(name))
+                        using (MemoryStream ms = new MemoryStream())
+                        {
+                            stream.CopyTo(ms);
+                            return new ClanMusicInfo(
+                                new KBinXML(
+                                    LZ77.Decompress(
+                                        ms.ToArray()
+                                    ).ToArray()
+                                ).Document
+                            );
+                        }
+                    }
+                }
+
+                return null;
+            });
+        }
+
+        public static Task<ClanMusicInfo> Instance { get; private set; }
+
+        private readonly XDocument doc;
+
+        private ClanMusicInfo(XDocument doc)
+        {
+            this.doc = doc;
+
+            BuildMusicList();
+        }
+
+        private List<int> musicIdList;
+        public IList<int> MusicIdList { get => musicIdList.AsReadOnly(); }
+
+        private void BuildMusicList()
+        {
+            XElement body = doc.Root.Element("music_data").Element("body");
+            var musicData = body.Elements("data");
+
+            musicIdList = new List<int>(musicData.Count());
+
+            foreach (XElement musicEntry in musicData)
+            {
+                musicIdList.Add(int.Parse(musicEntry.Element("music_id").Value));
+            }
+        }
+
+        private static readonly Random rng = new Random();
+
+        public List<int> GetRandomSongs(int num)
+        {
+            HashSet<int> candidateIndexes = new HashSet<int>();
+            while (candidateIndexes.Count < num)
+                candidateIndexes.Add(rng.Next(0, musicIdList.Count));
+
+            List<int> result = new List<int>(num);
+            result.AddRange(candidateIndexes.Select(i => musicIdList[i]));
+
+            for (int i = result.Count - 1; i > 0; --i)
+            {
+                int k = rng.Next(i + 1);
+                int v = result[i];
+                result[i] = result[k];
+                result[k] = v;
+            }
+
+            return result;
+        }
+    }
+}

eAmuseTest/Program.cs

@@ -1,4 +1,5 @@
-using System;
+using System;
+using System.IO;
 using System.Text;
 using System.Linq;
 using System.Xml.Linq;
@@ -33,7 +34,7 @@ namespace eAmuseTest
 
             KBinXML kbinxml = new KBinXML(rawData.ToArray());
 
-            Console.WriteLine(kbinxml.ToString());
+            Console.WriteLine(kbinxml);
 
             //GenerateEchidnaSQL(kbinxml);
         }

eAmuseTest/Properties/launchSettings.json

@@ -0,0 +1,8 @@
+{
+  "profiles": {
+    "eAmuseTest": {
+      "commandName": "Project",
+      "workingDirectory": "."
+    }
+  }
+}