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48 lines
1.7 KiB
48 lines
1.7 KiB
using IPA.Utilities;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text;
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namespace IPA.Injector
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{
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internal static class GameVersionEarly
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{
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private static string ResolveDataPath(string installDir) =>
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Path.Combine(Directory.EnumerateDirectories(installDir, "*_Data").First(), "globalgamemanagers");
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internal static string GetGameVersion()
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{
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var mgr = ResolveDataPath(BeatSaber.InstallPath);
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using (var stream = File.OpenRead(mgr))
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using (var reader = new BinaryReader(stream, Encoding.UTF8))
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{
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const string key = "public.app-category.games";
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int pos = 0;
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while (stream.Position < stream.Length && pos < key.Length)
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{
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if (reader.ReadByte() == key[pos]) pos++;
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else pos = 0;
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}
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if (stream.Position == stream.Length) // we went through the entire stream without finding the key
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throw new KeyNotFoundException("Could not find key '" + key + "' in " + mgr);
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// otherwise pos == key.Length, which means we found it
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int offset = 136 - key.Length - sizeof(int);
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stream.Seek(offset, SeekOrigin.Current); // advance past junk to beginning of string
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int strlen = reader.ReadInt32(); // assumes LE
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var strbytes = reader.ReadBytes(strlen);
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return Encoding.UTF8.GetString(strbytes);
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}
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}
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internal static SemVer.Version SafeParseVersion() => new SemVer.Version(GetGameVersion(), true);
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internal static void Load() => BeatSaber.SetEarlyGameVersion(SafeParseVersion());
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}
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}
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